1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000-2009 Josh Coalson
3 * Copyright (C) 2011-2016 Xiph.Org Foundation
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * - Neither the name of the Xiph.org Foundation nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifdef HAVE_CONFIG_H
34 # include <config.h>
35 #endif
36
37 #include <stdio.h>
38 #include <stdlib.h> /* for malloc() */
39 #include <string.h> /* for memset/memcpy() */
40 #include <sys/stat.h> /* for stat() */
41 #include <sys/types.h> /* for off_t */
42 #include "share/compat.h"
43 #include "FLAC/assert.h"
44 #include "share/alloc.h"
45 #include "protected/stream_decoder.h"
46 #include "private/bitreader.h"
47 #include "private/bitmath.h"
48 #include "private/cpu.h"
49 #include "private/crc.h"
50 #include "private/fixed.h"
51 #include "private/format.h"
52 #include "private/lpc.h"
53 #include "private/md5.h"
54 #include "private/memory.h"
55 #include "private/macros.h"
56
57
58 /* technically this should be in an "export.c" but this is convenient enough */
59 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = FLAC__HAS_OGG;
60
61
62 /***********************************************************************
63 *
64 * Private static data
65 *
66 ***********************************************************************/
67
68 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
69
70 /***********************************************************************
71 *
72 * Private class method prototypes
73 *
74 ***********************************************************************/
75
76 static void set_defaults_(FLAC__StreamDecoder *decoder);
77 static FILE *get_binary_stdin_(void);
78 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels);
79 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
80 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
81 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
82 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
83 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
84 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length);
85 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
86 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
87 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
88 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
89 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
90 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
91 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
92 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
93 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
94 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
95 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
96 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
97 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
98 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
99 #if FLAC__HAS_OGG
100 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
101 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
102 #endif
103 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
104 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
105 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
106 #if FLAC__HAS_OGG
107 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
108 #endif
109 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
110 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
111 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
112 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
113 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
114
115 /***********************************************************************
116 *
117 * Private class data
118 *
119 ***********************************************************************/
120
121 typedef struct FLAC__StreamDecoderPrivate {
122 FLAC__bool is_ogg;
123 FLAC__StreamDecoderReadCallback read_callback;
124 FLAC__StreamDecoderSeekCallback seek_callback;
125 FLAC__StreamDecoderTellCallback tell_callback;
126 FLAC__StreamDecoderLengthCallback length_callback;
127 FLAC__StreamDecoderEofCallback eof_callback;
128 FLAC__StreamDecoderWriteCallback write_callback;
129 FLAC__StreamDecoderMetadataCallback metadata_callback;
130 FLAC__StreamDecoderErrorCallback error_callback;
131 /* generic 32-bit datapath: */
132 void (*local_lpc_restore_signal)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
133 /* generic 64-bit datapath: */
134 void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
135 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
136 void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
137 void *client_data;
138 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
139 FLAC__BitReader *input;
140 FLAC__int32 *output[FLAC__MAX_CHANNELS];
141 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
142 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
143 uint32_t output_capacity, output_channels;
144 FLAC__uint32 fixed_block_size, next_fixed_block_size;
145 FLAC__uint64 samples_decoded;
146 FLAC__bool has_stream_info, has_seek_table;
147 FLAC__StreamMetadata stream_info;
148 FLAC__StreamMetadata seek_table;
149 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
150 FLAC__byte *metadata_filter_ids;
151 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
152 FLAC__Frame frame;
153 FLAC__bool cached; /* true if there is a byte in lookahead */
154 FLAC__CPUInfo cpuinfo;
155 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
156 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
157 /* unaligned (original) pointers to allocated data */
158 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
159 FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
160 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
161 FLAC__bool is_seeking;
162 FLAC__MD5Context md5context;
163 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
164 /* (the rest of these are only used for seeking) */
165 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
166 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
167 FLAC__uint64 target_sample;
168 uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
169 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
170 } FLAC__StreamDecoderPrivate;
171
172 /***********************************************************************
173 *
174 * Public static class data
175 *
176 ***********************************************************************/
177
178 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
179 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
180 "FLAC__STREAM_DECODER_READ_METADATA",
181 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
182 "FLAC__STREAM_DECODER_READ_FRAME",
183 "FLAC__STREAM_DECODER_END_OF_STREAM",
184 "FLAC__STREAM_DECODER_OGG_ERROR",
185 "FLAC__STREAM_DECODER_SEEK_ERROR",
186 "FLAC__STREAM_DECODER_ABORTED",
187 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
188 "FLAC__STREAM_DECODER_UNINITIALIZED"
189 };
190
191 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
192 "FLAC__STREAM_DECODER_INIT_STATUS_OK",
193 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
194 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
195 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
196 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
197 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
198 };
199
200 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
201 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
202 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
203 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
204 };
205
206 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
207 "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
208 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
209 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
210 };
211
212 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
213 "FLAC__STREAM_DECODER_TELL_STATUS_OK",
214 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
215 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
216 };
217
218 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
219 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
220 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
221 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
222 };
223
224 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
225 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
226 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
227 };
228
229 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
230 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
231 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
232 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
233 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
234 };
235
236 /***********************************************************************
237 *
238 * Class constructor/destructor
239 *
240 ***********************************************************************/
FLAC__stream_decoder_new(void)241 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
242 {
243 FLAC__StreamDecoder *decoder;
244 uint32_t i;
245
246 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
247
248 decoder = calloc(1, sizeof(FLAC__StreamDecoder));
249 if(decoder == 0) {
250 return 0;
251 }
252
253 decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
254 if(decoder->protected_ == 0) {
255 free(decoder);
256 return 0;
257 }
258
259 decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
260 if(decoder->private_ == 0) {
261 free(decoder->protected_);
262 free(decoder);
263 return 0;
264 }
265
266 decoder->private_->input = FLAC__bitreader_new();
267 if(decoder->private_->input == 0) {
268 free(decoder->private_);
269 free(decoder->protected_);
270 free(decoder);
271 return 0;
272 }
273
274 decoder->private_->metadata_filter_ids_capacity = 16;
275 if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
276 FLAC__bitreader_delete(decoder->private_->input);
277 free(decoder->private_);
278 free(decoder->protected_);
279 free(decoder);
280 return 0;
281 }
282
283 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
284 decoder->private_->output[i] = 0;
285 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
286 }
287
288 decoder->private_->output_capacity = 0;
289 decoder->private_->output_channels = 0;
290 decoder->private_->has_seek_table = false;
291
292 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
293 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
294
295 decoder->private_->file = 0;
296
297 set_defaults_(decoder);
298
299 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
300
301 return decoder;
302 }
303
FLAC__stream_decoder_delete(FLAC__StreamDecoder * decoder)304 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
305 {
306 uint32_t i;
307
308 if (decoder == NULL)
309 return ;
310
311 FLAC__ASSERT(0 != decoder->protected_);
312 FLAC__ASSERT(0 != decoder->private_);
313 FLAC__ASSERT(0 != decoder->private_->input);
314
315 (void)FLAC__stream_decoder_finish(decoder);
316
317 if(0 != decoder->private_->metadata_filter_ids)
318 free(decoder->private_->metadata_filter_ids);
319
320 FLAC__bitreader_delete(decoder->private_->input);
321
322 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
323 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
324
325 free(decoder->private_);
326 free(decoder->protected_);
327 free(decoder);
328 }
329
330 /***********************************************************************
331 *
332 * Public class methods
333 *
334 ***********************************************************************/
335
init_stream_internal_(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)336 static FLAC__StreamDecoderInitStatus init_stream_internal_(
337 FLAC__StreamDecoder *decoder,
338 FLAC__StreamDecoderReadCallback read_callback,
339 FLAC__StreamDecoderSeekCallback seek_callback,
340 FLAC__StreamDecoderTellCallback tell_callback,
341 FLAC__StreamDecoderLengthCallback length_callback,
342 FLAC__StreamDecoderEofCallback eof_callback,
343 FLAC__StreamDecoderWriteCallback write_callback,
344 FLAC__StreamDecoderMetadataCallback metadata_callback,
345 FLAC__StreamDecoderErrorCallback error_callback,
346 void *client_data,
347 FLAC__bool is_ogg
348 )
349 {
350 FLAC__ASSERT(0 != decoder);
351
352 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
353 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
354
355 if(FLAC__HAS_OGG == 0 && is_ogg)
356 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
357
358 if(
359 0 == read_callback ||
360 0 == write_callback ||
361 0 == error_callback ||
362 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
363 )
364 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
365
366 #if FLAC__HAS_OGG
367 decoder->private_->is_ogg = is_ogg;
368 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
369 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
370 #endif
371
372 /*
373 * get the CPU info and set the function pointers
374 */
375 FLAC__cpu_info(&decoder->private_->cpuinfo);
376 /* first default to the non-asm routines */
377 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
378 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
379 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
380 /* now override with asm where appropriate */
381 #ifndef FLAC__NO_ASM
382 if(decoder->private_->cpuinfo.use_asm) {
383 #ifdef FLAC__CPU_IA32
384 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
385 #ifdef FLAC__HAS_NASM
386 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */
387 if (decoder->private_->cpuinfo.x86.mmx) {
388 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
389 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
390 }
391 else {
392 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
393 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
394 }
395 #endif
396 #if FLAC__HAS_X86INTRIN && ! defined FLAC__INTEGER_ONLY_LIBRARY
397 # if defined FLAC__SSE4_1_SUPPORTED
398 if (decoder->private_->cpuinfo.x86.sse41) {
399 # if !defined FLAC__HAS_NASM /* these are not undoubtedly faster than their MMX ASM counterparts */
400 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_intrin_sse41;
401 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse41;
402 # endif
403 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41;
404 }
405 # endif
406 #endif
407 #elif defined FLAC__CPU_X86_64
408 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64);
409 /* No useful SSE optimizations yet */
410 #endif
411 }
412 #endif
413
414 /* from here on, errors are fatal */
415
416 if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
417 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
418 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
419 }
420
421 decoder->private_->read_callback = read_callback;
422 decoder->private_->seek_callback = seek_callback;
423 decoder->private_->tell_callback = tell_callback;
424 decoder->private_->length_callback = length_callback;
425 decoder->private_->eof_callback = eof_callback;
426 decoder->private_->write_callback = write_callback;
427 decoder->private_->metadata_callback = metadata_callback;
428 decoder->private_->error_callback = error_callback;
429 decoder->private_->client_data = client_data;
430 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
431 decoder->private_->samples_decoded = 0;
432 decoder->private_->has_stream_info = false;
433 decoder->private_->cached = false;
434
435 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
436 decoder->private_->is_seeking = false;
437
438 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
439 if(!FLAC__stream_decoder_reset(decoder)) {
440 /* above call sets the state for us */
441 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
442 }
443
444 return FLAC__STREAM_DECODER_INIT_STATUS_OK;
445 }
446
FLAC__stream_decoder_init_stream(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)447 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
448 FLAC__StreamDecoder *decoder,
449 FLAC__StreamDecoderReadCallback read_callback,
450 FLAC__StreamDecoderSeekCallback seek_callback,
451 FLAC__StreamDecoderTellCallback tell_callback,
452 FLAC__StreamDecoderLengthCallback length_callback,
453 FLAC__StreamDecoderEofCallback eof_callback,
454 FLAC__StreamDecoderWriteCallback write_callback,
455 FLAC__StreamDecoderMetadataCallback metadata_callback,
456 FLAC__StreamDecoderErrorCallback error_callback,
457 void *client_data
458 )
459 {
460 return init_stream_internal_(
461 decoder,
462 read_callback,
463 seek_callback,
464 tell_callback,
465 length_callback,
466 eof_callback,
467 write_callback,
468 metadata_callback,
469 error_callback,
470 client_data,
471 /*is_ogg=*/false
472 );
473 }
474
FLAC__stream_decoder_init_ogg_stream(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)475 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
476 FLAC__StreamDecoder *decoder,
477 FLAC__StreamDecoderReadCallback read_callback,
478 FLAC__StreamDecoderSeekCallback seek_callback,
479 FLAC__StreamDecoderTellCallback tell_callback,
480 FLAC__StreamDecoderLengthCallback length_callback,
481 FLAC__StreamDecoderEofCallback eof_callback,
482 FLAC__StreamDecoderWriteCallback write_callback,
483 FLAC__StreamDecoderMetadataCallback metadata_callback,
484 FLAC__StreamDecoderErrorCallback error_callback,
485 void *client_data
486 )
487 {
488 return init_stream_internal_(
489 decoder,
490 read_callback,
491 seek_callback,
492 tell_callback,
493 length_callback,
494 eof_callback,
495 write_callback,
496 metadata_callback,
497 error_callback,
498 client_data,
499 /*is_ogg=*/true
500 );
501 }
502
init_FILE_internal_(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)503 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
504 FLAC__StreamDecoder *decoder,
505 FILE *file,
506 FLAC__StreamDecoderWriteCallback write_callback,
507 FLAC__StreamDecoderMetadataCallback metadata_callback,
508 FLAC__StreamDecoderErrorCallback error_callback,
509 void *client_data,
510 FLAC__bool is_ogg
511 )
512 {
513 FLAC__ASSERT(0 != decoder);
514 FLAC__ASSERT(0 != file);
515
516 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
517 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
518
519 if(0 == write_callback || 0 == error_callback)
520 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
521
522 /*
523 * To make sure that our file does not go unclosed after an error, we
524 * must assign the FILE pointer before any further error can occur in
525 * this routine.
526 */
527 if(file == stdin)
528 file = get_binary_stdin_(); /* just to be safe */
529
530 decoder->private_->file = file;
531
532 return init_stream_internal_(
533 decoder,
534 file_read_callback_,
535 decoder->private_->file == stdin? 0: file_seek_callback_,
536 decoder->private_->file == stdin? 0: file_tell_callback_,
537 decoder->private_->file == stdin? 0: file_length_callback_,
538 file_eof_callback_,
539 write_callback,
540 metadata_callback,
541 error_callback,
542 client_data,
543 is_ogg
544 );
545 }
546
FLAC__stream_decoder_init_FILE(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)547 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
548 FLAC__StreamDecoder *decoder,
549 FILE *file,
550 FLAC__StreamDecoderWriteCallback write_callback,
551 FLAC__StreamDecoderMetadataCallback metadata_callback,
552 FLAC__StreamDecoderErrorCallback error_callback,
553 void *client_data
554 )
555 {
556 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
557 }
558
FLAC__stream_decoder_init_ogg_FILE(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)559 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
560 FLAC__StreamDecoder *decoder,
561 FILE *file,
562 FLAC__StreamDecoderWriteCallback write_callback,
563 FLAC__StreamDecoderMetadataCallback metadata_callback,
564 FLAC__StreamDecoderErrorCallback error_callback,
565 void *client_data
566 )
567 {
568 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
569 }
570
init_file_internal_(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)571 static FLAC__StreamDecoderInitStatus init_file_internal_(
572 FLAC__StreamDecoder *decoder,
573 const char *filename,
574 FLAC__StreamDecoderWriteCallback write_callback,
575 FLAC__StreamDecoderMetadataCallback metadata_callback,
576 FLAC__StreamDecoderErrorCallback error_callback,
577 void *client_data,
578 FLAC__bool is_ogg
579 )
580 {
581 FILE *file;
582
583 FLAC__ASSERT(0 != decoder);
584
585 /*
586 * To make sure that our file does not go unclosed after an error, we
587 * have to do the same entrance checks here that are later performed
588 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
589 */
590 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
591 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
592
593 if(0 == write_callback || 0 == error_callback)
594 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
595
596 file = filename? flac_fopen(filename, "rb") : stdin;
597
598 if(0 == file)
599 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
600
601 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
602 }
603
FLAC__stream_decoder_init_file(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)604 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
605 FLAC__StreamDecoder *decoder,
606 const char *filename,
607 FLAC__StreamDecoderWriteCallback write_callback,
608 FLAC__StreamDecoderMetadataCallback metadata_callback,
609 FLAC__StreamDecoderErrorCallback error_callback,
610 void *client_data
611 )
612 {
613 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
614 }
615
FLAC__stream_decoder_init_ogg_file(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)616 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
617 FLAC__StreamDecoder *decoder,
618 const char *filename,
619 FLAC__StreamDecoderWriteCallback write_callback,
620 FLAC__StreamDecoderMetadataCallback metadata_callback,
621 FLAC__StreamDecoderErrorCallback error_callback,
622 void *client_data
623 )
624 {
625 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
626 }
627
FLAC__stream_decoder_finish(FLAC__StreamDecoder * decoder)628 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
629 {
630 FLAC__bool md5_failed = false;
631 uint32_t i;
632
633 FLAC__ASSERT(0 != decoder);
634 FLAC__ASSERT(0 != decoder->private_);
635 FLAC__ASSERT(0 != decoder->protected_);
636
637 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
638 return true;
639
640 /* see the comment in FLAC__stream_decoder_reset() as to why we
641 * always call FLAC__MD5Final()
642 */
643 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
644
645 free(decoder->private_->seek_table.data.seek_table.points);
646 decoder->private_->seek_table.data.seek_table.points = 0;
647 decoder->private_->has_seek_table = false;
648
649 FLAC__bitreader_free(decoder->private_->input);
650 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
651 /* WATCHOUT:
652 * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
653 * require that the output arrays have a buffer of up to 3 zeroes
654 * in front (at negative indices) for alignment purposes;
655 * we use 4 to keep the data well-aligned.
656 */
657 if(0 != decoder->private_->output[i]) {
658 free(decoder->private_->output[i]-4);
659 decoder->private_->output[i] = 0;
660 }
661 if(0 != decoder->private_->residual_unaligned[i]) {
662 free(decoder->private_->residual_unaligned[i]);
663 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
664 }
665 }
666 decoder->private_->output_capacity = 0;
667 decoder->private_->output_channels = 0;
668
669 #if FLAC__HAS_OGG
670 if(decoder->private_->is_ogg)
671 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
672 #endif
673
674 if(0 != decoder->private_->file) {
675 if(decoder->private_->file != stdin)
676 fclose(decoder->private_->file);
677 decoder->private_->file = 0;
678 }
679
680 if(decoder->private_->do_md5_checking) {
681 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
682 md5_failed = true;
683 }
684 decoder->private_->is_seeking = false;
685
686 set_defaults_(decoder);
687
688 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
689
690 return !md5_failed;
691 }
692
FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder * decoder,long value)693 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
694 {
695 FLAC__ASSERT(0 != decoder);
696 FLAC__ASSERT(0 != decoder->private_);
697 FLAC__ASSERT(0 != decoder->protected_);
698 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
699 return false;
700 #if FLAC__HAS_OGG
701 /* can't check decoder->private_->is_ogg since that's not set until init time */
702 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
703 return true;
704 #else
705 (void)value;
706 return false;
707 #endif
708 }
709
FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder * decoder,FLAC__bool value)710 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
711 {
712 FLAC__ASSERT(0 != decoder);
713 FLAC__ASSERT(0 != decoder->protected_);
714 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
715 return false;
716 decoder->protected_->md5_checking = value;
717 return true;
718 }
719
FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)720 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
721 {
722 FLAC__ASSERT(0 != decoder);
723 FLAC__ASSERT(0 != decoder->private_);
724 FLAC__ASSERT(0 != decoder->protected_);
725 FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
726 /* double protection */
727 if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
728 return false;
729 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
730 return false;
731 decoder->private_->metadata_filter[type] = true;
732 if(type == FLAC__METADATA_TYPE_APPLICATION)
733 decoder->private_->metadata_filter_ids_count = 0;
734 return true;
735 }
736
FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])737 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
738 {
739 FLAC__ASSERT(0 != decoder);
740 FLAC__ASSERT(0 != decoder->private_);
741 FLAC__ASSERT(0 != decoder->protected_);
742 FLAC__ASSERT(0 != id);
743 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
744 return false;
745
746 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
747 return true;
748
749 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
750
751 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
752 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
753 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
754 return false;
755 }
756 decoder->private_->metadata_filter_ids_capacity *= 2;
757 }
758
759 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
760 decoder->private_->metadata_filter_ids_count++;
761
762 return true;
763 }
764
FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder * decoder)765 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
766 {
767 uint32_t i;
768 FLAC__ASSERT(0 != decoder);
769 FLAC__ASSERT(0 != decoder->private_);
770 FLAC__ASSERT(0 != decoder->protected_);
771 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
772 return false;
773 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
774 decoder->private_->metadata_filter[i] = true;
775 decoder->private_->metadata_filter_ids_count = 0;
776 return true;
777 }
778
FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)779 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
780 {
781 FLAC__ASSERT(0 != decoder);
782 FLAC__ASSERT(0 != decoder->private_);
783 FLAC__ASSERT(0 != decoder->protected_);
784 FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
785 /* double protection */
786 if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
787 return false;
788 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
789 return false;
790 decoder->private_->metadata_filter[type] = false;
791 if(type == FLAC__METADATA_TYPE_APPLICATION)
792 decoder->private_->metadata_filter_ids_count = 0;
793 return true;
794 }
795
FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])796 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
797 {
798 FLAC__ASSERT(0 != decoder);
799 FLAC__ASSERT(0 != decoder->private_);
800 FLAC__ASSERT(0 != decoder->protected_);
801 FLAC__ASSERT(0 != id);
802 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
803 return false;
804
805 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
806 return true;
807
808 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
809
810 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
811 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
812 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
813 return false;
814 }
815 decoder->private_->metadata_filter_ids_capacity *= 2;
816 }
817
818 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
819 decoder->private_->metadata_filter_ids_count++;
820
821 return true;
822 }
823
FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder * decoder)824 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
825 {
826 FLAC__ASSERT(0 != decoder);
827 FLAC__ASSERT(0 != decoder->private_);
828 FLAC__ASSERT(0 != decoder->protected_);
829 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
830 return false;
831 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
832 decoder->private_->metadata_filter_ids_count = 0;
833 return true;
834 }
835
FLAC__stream_decoder_get_state(const FLAC__StreamDecoder * decoder)836 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
837 {
838 FLAC__ASSERT(0 != decoder);
839 FLAC__ASSERT(0 != decoder->protected_);
840 return decoder->protected_->state;
841 }
842
FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder * decoder)843 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
844 {
845 return FLAC__StreamDecoderStateString[decoder->protected_->state];
846 }
847
FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder * decoder)848 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
849 {
850 FLAC__ASSERT(0 != decoder);
851 FLAC__ASSERT(0 != decoder->protected_);
852 return decoder->protected_->md5_checking;
853 }
854
FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder * decoder)855 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
856 {
857 FLAC__ASSERT(0 != decoder);
858 FLAC__ASSERT(0 != decoder->protected_);
859 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
860 }
861
FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder * decoder)862 FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
863 {
864 FLAC__ASSERT(0 != decoder);
865 FLAC__ASSERT(0 != decoder->protected_);
866 return decoder->protected_->channels;
867 }
868
FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder * decoder)869 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
870 {
871 FLAC__ASSERT(0 != decoder);
872 FLAC__ASSERT(0 != decoder->protected_);
873 return decoder->protected_->channel_assignment;
874 }
875
FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder * decoder)876 FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
877 {
878 FLAC__ASSERT(0 != decoder);
879 FLAC__ASSERT(0 != decoder->protected_);
880 return decoder->protected_->bits_per_sample;
881 }
882
FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder * decoder)883 FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
884 {
885 FLAC__ASSERT(0 != decoder);
886 FLAC__ASSERT(0 != decoder->protected_);
887 return decoder->protected_->sample_rate;
888 }
889
FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder * decoder)890 FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
891 {
892 FLAC__ASSERT(0 != decoder);
893 FLAC__ASSERT(0 != decoder->protected_);
894 return decoder->protected_->blocksize;
895 }
896
FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder * decoder,FLAC__uint64 * position)897 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
898 {
899 FLAC__ASSERT(0 != decoder);
900 FLAC__ASSERT(0 != decoder->private_);
901 FLAC__ASSERT(0 != position);
902
903 if(FLAC__HAS_OGG && decoder->private_->is_ogg)
904 return false;
905
906 if(0 == decoder->private_->tell_callback)
907 return false;
908 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
909 return false;
910 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
911 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
912 return false;
913 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
914 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
915 return true;
916 }
917
FLAC__stream_decoder_flush(FLAC__StreamDecoder * decoder)918 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
919 {
920 FLAC__ASSERT(0 != decoder);
921 FLAC__ASSERT(0 != decoder->private_);
922 FLAC__ASSERT(0 != decoder->protected_);
923
924 if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
925 return false;
926
927 decoder->private_->samples_decoded = 0;
928 decoder->private_->do_md5_checking = false;
929
930 #if FLAC__HAS_OGG
931 if(decoder->private_->is_ogg)
932 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
933 #endif
934
935 if(!FLAC__bitreader_clear(decoder->private_->input)) {
936 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
937 return false;
938 }
939 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
940
941 return true;
942 }
943
FLAC__stream_decoder_reset(FLAC__StreamDecoder * decoder)944 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
945 {
946 FLAC__ASSERT(0 != decoder);
947 FLAC__ASSERT(0 != decoder->private_);
948 FLAC__ASSERT(0 != decoder->protected_);
949
950 if(!FLAC__stream_decoder_flush(decoder)) {
951 /* above call sets the state for us */
952 return false;
953 }
954
955 #if FLAC__HAS_OGG
956 /*@@@ could go in !internal_reset_hack block below */
957 if(decoder->private_->is_ogg)
958 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
959 #endif
960
961 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
962 * (internal_reset_hack) don't try to rewind since we are already at
963 * the beginning of the stream and don't want to fail if the input is
964 * not seekable.
965 */
966 if(!decoder->private_->internal_reset_hack) {
967 if(decoder->private_->file == stdin)
968 return false; /* can't rewind stdin, reset fails */
969 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
970 return false; /* seekable and seek fails, reset fails */
971 }
972 else
973 decoder->private_->internal_reset_hack = false;
974
975 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
976
977 decoder->private_->has_stream_info = false;
978
979 free(decoder->private_->seek_table.data.seek_table.points);
980 decoder->private_->seek_table.data.seek_table.points = 0;
981 decoder->private_->has_seek_table = false;
982
983 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
984 /*
985 * This goes in reset() and not flush() because according to the spec, a
986 * fixed-blocksize stream must stay that way through the whole stream.
987 */
988 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
989
990 /* We initialize the FLAC__MD5Context even though we may never use it. This
991 * is because md5 checking may be turned on to start and then turned off if
992 * a seek occurs. So we init the context here and finalize it in
993 * FLAC__stream_decoder_finish() to make sure things are always cleaned up
994 * properly.
995 */
996 FLAC__MD5Init(&decoder->private_->md5context);
997
998 decoder->private_->first_frame_offset = 0;
999 decoder->private_->unparseable_frame_count = 0;
1000
1001 return true;
1002 }
1003
FLAC__stream_decoder_process_single(FLAC__StreamDecoder * decoder)1004 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1005 {
1006 FLAC__bool got_a_frame;
1007 FLAC__ASSERT(0 != decoder);
1008 FLAC__ASSERT(0 != decoder->protected_);
1009
1010 while(1) {
1011 switch(decoder->protected_->state) {
1012 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1013 if(!find_metadata_(decoder))
1014 return false; /* above function sets the status for us */
1015 break;
1016 case FLAC__STREAM_DECODER_READ_METADATA:
1017 if(!read_metadata_(decoder))
1018 return false; /* above function sets the status for us */
1019 else
1020 return true;
1021 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1022 if(!frame_sync_(decoder))
1023 return true; /* above function sets the status for us */
1024 break;
1025 case FLAC__STREAM_DECODER_READ_FRAME:
1026 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1027 return false; /* above function sets the status for us */
1028 if(got_a_frame)
1029 return true; /* above function sets the status for us */
1030 break;
1031 case FLAC__STREAM_DECODER_END_OF_STREAM:
1032 case FLAC__STREAM_DECODER_ABORTED:
1033 return true;
1034 default:
1035 FLAC__ASSERT(0);
1036 return false;
1037 }
1038 }
1039 }
1040
FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder * decoder)1041 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1042 {
1043 FLAC__ASSERT(0 != decoder);
1044 FLAC__ASSERT(0 != decoder->protected_);
1045
1046 while(1) {
1047 switch(decoder->protected_->state) {
1048 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1049 if(!find_metadata_(decoder))
1050 return false; /* above function sets the status for us */
1051 break;
1052 case FLAC__STREAM_DECODER_READ_METADATA:
1053 if(!read_metadata_(decoder))
1054 return false; /* above function sets the status for us */
1055 break;
1056 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1057 case FLAC__STREAM_DECODER_READ_FRAME:
1058 case FLAC__STREAM_DECODER_END_OF_STREAM:
1059 case FLAC__STREAM_DECODER_ABORTED:
1060 return true;
1061 default:
1062 FLAC__ASSERT(0);
1063 return false;
1064 }
1065 }
1066 }
1067
FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder * decoder)1068 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1069 {
1070 FLAC__bool dummy;
1071 FLAC__ASSERT(0 != decoder);
1072 FLAC__ASSERT(0 != decoder->protected_);
1073
1074 while(1) {
1075 switch(decoder->protected_->state) {
1076 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1077 if(!find_metadata_(decoder))
1078 return false; /* above function sets the status for us */
1079 break;
1080 case FLAC__STREAM_DECODER_READ_METADATA:
1081 if(!read_metadata_(decoder))
1082 return false; /* above function sets the status for us */
1083 break;
1084 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1085 if(!frame_sync_(decoder))
1086 return true; /* above function sets the status for us */
1087 break;
1088 case FLAC__STREAM_DECODER_READ_FRAME:
1089 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1090 return false; /* above function sets the status for us */
1091 break;
1092 case FLAC__STREAM_DECODER_END_OF_STREAM:
1093 case FLAC__STREAM_DECODER_ABORTED:
1094 return true;
1095 default:
1096 FLAC__ASSERT(0);
1097 return false;
1098 }
1099 }
1100 }
1101
FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder * decoder)1102 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1103 {
1104 FLAC__bool got_a_frame;
1105 FLAC__ASSERT(0 != decoder);
1106 FLAC__ASSERT(0 != decoder->protected_);
1107
1108 while(1) {
1109 switch(decoder->protected_->state) {
1110 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1111 case FLAC__STREAM_DECODER_READ_METADATA:
1112 return false; /* above function sets the status for us */
1113 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1114 if(!frame_sync_(decoder))
1115 return true; /* above function sets the status for us */
1116 break;
1117 case FLAC__STREAM_DECODER_READ_FRAME:
1118 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1119 return false; /* above function sets the status for us */
1120 if(got_a_frame)
1121 return true; /* above function sets the status for us */
1122 break;
1123 case FLAC__STREAM_DECODER_END_OF_STREAM:
1124 case FLAC__STREAM_DECODER_ABORTED:
1125 return true;
1126 default:
1127 FLAC__ASSERT(0);
1128 return false;
1129 }
1130 }
1131 }
1132
FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder * decoder,FLAC__uint64 sample)1133 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1134 {
1135 FLAC__uint64 length;
1136
1137 FLAC__ASSERT(0 != decoder);
1138
1139 if(
1140 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1141 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1142 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1143 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1144 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1145 )
1146 return false;
1147
1148 if(0 == decoder->private_->seek_callback)
1149 return false;
1150
1151 FLAC__ASSERT(decoder->private_->seek_callback);
1152 FLAC__ASSERT(decoder->private_->tell_callback);
1153 FLAC__ASSERT(decoder->private_->length_callback);
1154 FLAC__ASSERT(decoder->private_->eof_callback);
1155
1156 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1157 return false;
1158
1159 decoder->private_->is_seeking = true;
1160
1161 /* turn off md5 checking if a seek is attempted */
1162 decoder->private_->do_md5_checking = false;
1163
1164 /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
1165 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1166 decoder->private_->is_seeking = false;
1167 return false;
1168 }
1169
1170 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1171 if(
1172 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1173 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1174 ) {
1175 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1176 /* above call sets the state for us */
1177 decoder->private_->is_seeking = false;
1178 return false;
1179 }
1180 /* check this again in case we didn't know total_samples the first time */
1181 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1182 decoder->private_->is_seeking = false;
1183 return false;
1184 }
1185 }
1186
1187 {
1188 const FLAC__bool ok =
1189 #if FLAC__HAS_OGG
1190 decoder->private_->is_ogg?
1191 seek_to_absolute_sample_ogg_(decoder, length, sample) :
1192 #endif
1193 seek_to_absolute_sample_(decoder, length, sample)
1194 ;
1195 decoder->private_->is_seeking = false;
1196 return ok;
1197 }
1198 }
1199
1200 /***********************************************************************
1201 *
1202 * Protected class methods
1203 *
1204 ***********************************************************************/
1205
FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder * decoder)1206 uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1207 {
1208 FLAC__ASSERT(0 != decoder);
1209 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1210 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1211 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1212 }
1213
1214 /***********************************************************************
1215 *
1216 * Private class methods
1217 *
1218 ***********************************************************************/
1219
set_defaults_(FLAC__StreamDecoder * decoder)1220 void set_defaults_(FLAC__StreamDecoder *decoder)
1221 {
1222 decoder->private_->is_ogg = false;
1223 decoder->private_->read_callback = 0;
1224 decoder->private_->seek_callback = 0;
1225 decoder->private_->tell_callback = 0;
1226 decoder->private_->length_callback = 0;
1227 decoder->private_->eof_callback = 0;
1228 decoder->private_->write_callback = 0;
1229 decoder->private_->metadata_callback = 0;
1230 decoder->private_->error_callback = 0;
1231 decoder->private_->client_data = 0;
1232
1233 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1234 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1235 decoder->private_->metadata_filter_ids_count = 0;
1236
1237 decoder->protected_->md5_checking = false;
1238
1239 #if FLAC__HAS_OGG
1240 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1241 #endif
1242 }
1243
1244 /*
1245 * This will forcibly set stdin to binary mode (for OSes that require it)
1246 */
get_binary_stdin_(void)1247 FILE *get_binary_stdin_(void)
1248 {
1249 /* if something breaks here it is probably due to the presence or
1250 * absence of an underscore before the identifiers 'setmode',
1251 * 'fileno', and/or 'O_BINARY'; check your system header files.
1252 */
1253 #if defined _MSC_VER || defined __MINGW32__
1254 _setmode(_fileno(stdin), _O_BINARY);
1255 #elif defined __EMX__
1256 setmode(fileno(stdin), O_BINARY);
1257 #endif
1258
1259 return stdin;
1260 }
1261
allocate_output_(FLAC__StreamDecoder * decoder,uint32_t size,uint32_t channels)1262 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels)
1263 {
1264 uint32_t i;
1265 FLAC__int32 *tmp;
1266
1267 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1268 return true;
1269
1270 /* simply using realloc() is not practical because the number of channels may change mid-stream */
1271
1272 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1273 if(0 != decoder->private_->output[i]) {
1274 free(decoder->private_->output[i]-4);
1275 decoder->private_->output[i] = 0;
1276 }
1277 if(0 != decoder->private_->residual_unaligned[i]) {
1278 free(decoder->private_->residual_unaligned[i]);
1279 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1280 }
1281 }
1282
1283 for(i = 0; i < channels; i++) {
1284 /* WATCHOUT:
1285 * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
1286 * require that the output arrays have a buffer of up to 3 zeroes
1287 * in front (at negative indices) for alignment purposes;
1288 * we use 4 to keep the data well-aligned.
1289 */
1290 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1291 if(tmp == 0) {
1292 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1293 return false;
1294 }
1295 memset(tmp, 0, sizeof(FLAC__int32)*4);
1296 decoder->private_->output[i] = tmp + 4;
1297
1298 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1299 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1300 return false;
1301 }
1302 }
1303
1304 decoder->private_->output_capacity = size;
1305 decoder->private_->output_channels = channels;
1306
1307 return true;
1308 }
1309
has_id_filtered_(FLAC__StreamDecoder * decoder,FLAC__byte * id)1310 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1311 {
1312 size_t i;
1313
1314 FLAC__ASSERT(0 != decoder);
1315 FLAC__ASSERT(0 != decoder->private_);
1316
1317 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1318 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1319 return true;
1320
1321 return false;
1322 }
1323
find_metadata_(FLAC__StreamDecoder * decoder)1324 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1325 {
1326 FLAC__uint32 x;
1327 uint32_t i, id;
1328 FLAC__bool first = true;
1329
1330 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1331
1332 for(i = id = 0; i < 4; ) {
1333 if(decoder->private_->cached) {
1334 x = (FLAC__uint32)decoder->private_->lookahead;
1335 decoder->private_->cached = false;
1336 }
1337 else {
1338 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1339 return false; /* read_callback_ sets the state for us */
1340 }
1341 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1342 first = true;
1343 i++;
1344 id = 0;
1345 continue;
1346 }
1347
1348 if(id >= 3)
1349 return false;
1350
1351 if(x == ID3V2_TAG_[id]) {
1352 id++;
1353 i = 0;
1354 if(id == 3) {
1355 if(!skip_id3v2_tag_(decoder))
1356 return false; /* skip_id3v2_tag_ sets the state for us */
1357 }
1358 continue;
1359 }
1360 id = 0;
1361 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1362 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1363 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1364 return false; /* read_callback_ sets the state for us */
1365
1366 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1367 /* else we have to check if the second byte is the end of a sync code */
1368 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1369 decoder->private_->lookahead = (FLAC__byte)x;
1370 decoder->private_->cached = true;
1371 }
1372 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
1373 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1374 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1375 return true;
1376 }
1377 }
1378 i = 0;
1379 if(first) {
1380 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1381 first = false;
1382 }
1383 }
1384
1385 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1386 return true;
1387 }
1388
read_metadata_(FLAC__StreamDecoder * decoder)1389 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1390 {
1391 FLAC__bool is_last;
1392 FLAC__uint32 i, x, type, length;
1393
1394 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1395
1396 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1397 return false; /* read_callback_ sets the state for us */
1398 is_last = x? true : false;
1399
1400 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1401 return false; /* read_callback_ sets the state for us */
1402
1403 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1404 return false; /* read_callback_ sets the state for us */
1405
1406 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1407 if(!read_metadata_streaminfo_(decoder, is_last, length))
1408 return false;
1409
1410 decoder->private_->has_stream_info = true;
1411 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
1412 decoder->private_->do_md5_checking = false;
1413 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1414 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1415 }
1416 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1417 /* just in case we already have a seek table, and reading the next one fails: */
1418 decoder->private_->has_seek_table = false;
1419
1420 if(!read_metadata_seektable_(decoder, is_last, length))
1421 return false;
1422
1423 decoder->private_->has_seek_table = true;
1424 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1425 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1426 }
1427 else {
1428 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1429 uint32_t real_length = length;
1430 FLAC__StreamMetadata block;
1431
1432 memset(&block, 0, sizeof(block));
1433 block.is_last = is_last;
1434 block.type = (FLAC__MetadataType)type;
1435 block.length = length;
1436
1437 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1438 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1439 return false; /* read_callback_ sets the state for us */
1440
1441 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1442 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1443 return false;
1444 }
1445
1446 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1447
1448 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1449 skip_it = !skip_it;
1450 }
1451
1452 if(skip_it) {
1453 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1454 return false; /* read_callback_ sets the state for us */
1455 }
1456 else {
1457 FLAC__bool ok = true;
1458 switch(type) {
1459 case FLAC__METADATA_TYPE_PADDING:
1460 /* skip the padding bytes */
1461 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1462 ok = false; /* read_callback_ sets the state for us */
1463 break;
1464 case FLAC__METADATA_TYPE_APPLICATION:
1465 /* remember, we read the ID already */
1466 if(real_length > 0) {
1467 if(0 == (block.data.application.data = malloc(real_length))) {
1468 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1469 ok = false;
1470 }
1471 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1472 ok = false; /* read_callback_ sets the state for us */
1473 }
1474 else
1475 block.data.application.data = 0;
1476 break;
1477 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1478 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
1479 ok = false;
1480 break;
1481 case FLAC__METADATA_TYPE_CUESHEET:
1482 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1483 ok = false;
1484 break;
1485 case FLAC__METADATA_TYPE_PICTURE:
1486 if(!read_metadata_picture_(decoder, &block.data.picture))
1487 ok = false;
1488 break;
1489 case FLAC__METADATA_TYPE_STREAMINFO:
1490 case FLAC__METADATA_TYPE_SEEKTABLE:
1491 FLAC__ASSERT(0);
1492 break;
1493 default:
1494 if(real_length > 0) {
1495 if(0 == (block.data.unknown.data = malloc(real_length))) {
1496 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1497 ok = false;
1498 }
1499 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1500 ok = false; /* read_callback_ sets the state for us */
1501 }
1502 else
1503 block.data.unknown.data = 0;
1504 break;
1505 }
1506 if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
1507 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1508
1509 /* now we have to free any malloc()ed data in the block */
1510 switch(type) {
1511 case FLAC__METADATA_TYPE_PADDING:
1512 break;
1513 case FLAC__METADATA_TYPE_APPLICATION:
1514 if(0 != block.data.application.data)
1515 free(block.data.application.data);
1516 break;
1517 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1518 if(0 != block.data.vorbis_comment.vendor_string.entry)
1519 free(block.data.vorbis_comment.vendor_string.entry);
1520 if(block.data.vorbis_comment.num_comments > 0)
1521 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1522 if(0 != block.data.vorbis_comment.comments[i].entry)
1523 free(block.data.vorbis_comment.comments[i].entry);
1524 if(0 != block.data.vorbis_comment.comments)
1525 free(block.data.vorbis_comment.comments);
1526 break;
1527 case FLAC__METADATA_TYPE_CUESHEET:
1528 if(block.data.cue_sheet.num_tracks > 0)
1529 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1530 if(0 != block.data.cue_sheet.tracks[i].indices)
1531 free(block.data.cue_sheet.tracks[i].indices);
1532 if(0 != block.data.cue_sheet.tracks)
1533 free(block.data.cue_sheet.tracks);
1534 break;
1535 case FLAC__METADATA_TYPE_PICTURE:
1536 if(0 != block.data.picture.mime_type)
1537 free(block.data.picture.mime_type);
1538 if(0 != block.data.picture.description)
1539 free(block.data.picture.description);
1540 if(0 != block.data.picture.data)
1541 free(block.data.picture.data);
1542 break;
1543 case FLAC__METADATA_TYPE_STREAMINFO:
1544 case FLAC__METADATA_TYPE_SEEKTABLE:
1545 FLAC__ASSERT(0);
1546 default:
1547 if(0 != block.data.unknown.data)
1548 free(block.data.unknown.data);
1549 break;
1550 }
1551
1552 if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
1553 return false;
1554 }
1555 }
1556
1557 if(is_last) {
1558 /* if this fails, it's OK, it's just a hint for the seek routine */
1559 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1560 decoder->private_->first_frame_offset = 0;
1561 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1562 }
1563
1564 return true;
1565 }
1566
read_metadata_streaminfo_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,uint32_t length)1567 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1568 {
1569 FLAC__uint32 x;
1570 uint32_t bits, used_bits = 0;
1571
1572 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1573
1574 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1575 decoder->private_->stream_info.is_last = is_last;
1576 decoder->private_->stream_info.length = length;
1577
1578 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1579 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1580 return false; /* read_callback_ sets the state for us */
1581 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1582 used_bits += bits;
1583
1584 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1585 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1586 return false; /* read_callback_ sets the state for us */
1587 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1588 used_bits += bits;
1589
1590 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1591 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1592 return false; /* read_callback_ sets the state for us */
1593 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1594 used_bits += bits;
1595
1596 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1597 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1598 return false; /* read_callback_ sets the state for us */
1599 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1600 used_bits += bits;
1601
1602 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1603 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1604 return false; /* read_callback_ sets the state for us */
1605 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1606 used_bits += bits;
1607
1608 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1609 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1610 return false; /* read_callback_ sets the state for us */
1611 decoder->private_->stream_info.data.stream_info.channels = x+1;
1612 used_bits += bits;
1613
1614 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1615 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1616 return false; /* read_callback_ sets the state for us */
1617 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1618 used_bits += bits;
1619
1620 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1621 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
1622 return false; /* read_callback_ sets the state for us */
1623 used_bits += bits;
1624
1625 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1626 return false; /* read_callback_ sets the state for us */
1627 used_bits += 16*8;
1628
1629 /* skip the rest of the block */
1630 FLAC__ASSERT(used_bits % 8 == 0);
1631 if (length < (used_bits / 8))
1632 return false; /* read_callback_ sets the state for us */
1633 length -= (used_bits / 8);
1634 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1635 return false; /* read_callback_ sets the state for us */
1636
1637 return true;
1638 }
1639
read_metadata_seektable_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,uint32_t length)1640 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1641 {
1642 FLAC__uint32 i, x;
1643 FLAC__uint64 xx;
1644
1645 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1646
1647 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1648 decoder->private_->seek_table.is_last = is_last;
1649 decoder->private_->seek_table.length = length;
1650
1651 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1652
1653 /* use realloc since we may pass through here several times (e.g. after seeking) */
1654 if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1655 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1656 return false;
1657 }
1658 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1659 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1660 return false; /* read_callback_ sets the state for us */
1661 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1662
1663 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1664 return false; /* read_callback_ sets the state for us */
1665 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1666
1667 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1668 return false; /* read_callback_ sets the state for us */
1669 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1670 }
1671 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1672 /* if there is a partial point left, skip over it */
1673 if(length > 0) {
1674 /*@@@ do a send_error_to_client_() here? there's an argument for either way */
1675 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1676 return false; /* read_callback_ sets the state for us */
1677 }
1678
1679 return true;
1680 }
1681
read_metadata_vorbiscomment_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_VorbisComment * obj,uint32_t length)1682 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length)
1683 {
1684 FLAC__uint32 i;
1685
1686 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1687
1688 /* read vendor string */
1689 if (length >= 8) {
1690 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
1691 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1692 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1693 return false; /* read_callback_ sets the state for us */
1694 if (obj->vendor_string.length > 0) {
1695 if (length < obj->vendor_string.length) {
1696 obj->vendor_string.length = 0;
1697 obj->vendor_string.entry = 0;
1698 goto skip;
1699 }
1700 else
1701 length -= obj->vendor_string.length;
1702 if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1703 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1704 return false;
1705 }
1706 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1707 return false; /* read_callback_ sets the state for us */
1708 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1709 }
1710 else
1711 obj->vendor_string.entry = 0;
1712
1713 /* read num comments */
1714 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1715 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1716 return false; /* read_callback_ sets the state for us */
1717
1718 /* read comments */
1719 if (obj->num_comments > 100000) {
1720 /* Possibly malicious file. */
1721 obj->num_comments = 0;
1722 return false;
1723 }
1724 if (obj->num_comments > 0) {
1725 if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1726 obj->num_comments = 0;
1727 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1728 return false;
1729 }
1730 for (i = 0; i < obj->num_comments; i++) {
1731 /* Initialize here just to make sure. */
1732 obj->comments[i].length = 0;
1733 obj->comments[i].entry = 0;
1734
1735 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1736 if (length < 4) {
1737 obj->num_comments = i;
1738 goto skip;
1739 }
1740 else
1741 length -= 4;
1742 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) {
1743 obj->num_comments = i;
1744 return false; /* read_callback_ sets the state for us */
1745 }
1746 if (obj->comments[i].length > 0) {
1747 if (length < obj->comments[i].length) {
1748 obj->num_comments = i;
1749 goto skip;
1750 }
1751 else
1752 length -= obj->comments[i].length;
1753 if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1754 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1755 obj->num_comments = i;
1756 return false;
1757 }
1758 memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
1759 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
1760 /* Current i-th entry is bad, so we delete it. */
1761 free (obj->comments[i].entry) ;
1762 obj->comments[i].entry = NULL ;
1763 obj->num_comments = i;
1764 goto skip;
1765 }
1766 obj->comments[i].entry[obj->comments[i].length] = '\0';
1767 }
1768 else
1769 obj->comments[i].entry = 0;
1770 }
1771 }
1772 }
1773
1774 skip:
1775 if (length > 0) {
1776 /* length > 0 can only happen on files with invalid data in comments */
1777 if(obj->num_comments < 1) {
1778 free(obj->comments);
1779 obj->comments = NULL;
1780 }
1781 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1782 return false; /* read_callback_ sets the state for us */
1783 }
1784
1785 return true;
1786 }
1787
read_metadata_cuesheet_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_CueSheet * obj)1788 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1789 {
1790 FLAC__uint32 i, j, x;
1791
1792 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1793
1794 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1795
1796 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1797 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
1798 return false; /* read_callback_ sets the state for us */
1799
1800 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1801 return false; /* read_callback_ sets the state for us */
1802
1803 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1804 return false; /* read_callback_ sets the state for us */
1805 obj->is_cd = x? true : false;
1806
1807 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1808 return false; /* read_callback_ sets the state for us */
1809
1810 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1811 return false; /* read_callback_ sets the state for us */
1812 obj->num_tracks = x;
1813
1814 if(obj->num_tracks > 0) {
1815 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1816 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1817 return false;
1818 }
1819 for(i = 0; i < obj->num_tracks; i++) {
1820 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1821 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1822 return false; /* read_callback_ sets the state for us */
1823
1824 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1825 return false; /* read_callback_ sets the state for us */
1826 track->number = (FLAC__byte)x;
1827
1828 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1829 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1830 return false; /* read_callback_ sets the state for us */
1831
1832 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1833 return false; /* read_callback_ sets the state for us */
1834 track->type = x;
1835
1836 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1837 return false; /* read_callback_ sets the state for us */
1838 track->pre_emphasis = x;
1839
1840 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1841 return false; /* read_callback_ sets the state for us */
1842
1843 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1844 return false; /* read_callback_ sets the state for us */
1845 track->num_indices = (FLAC__byte)x;
1846
1847 if(track->num_indices > 0) {
1848 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1849 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1850 return false;
1851 }
1852 for(j = 0; j < track->num_indices; j++) {
1853 FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
1854 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1855 return false; /* read_callback_ sets the state for us */
1856
1857 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1858 return false; /* read_callback_ sets the state for us */
1859 indx->number = (FLAC__byte)x;
1860
1861 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1862 return false; /* read_callback_ sets the state for us */
1863 }
1864 }
1865 }
1866 }
1867
1868 return true;
1869 }
1870
read_metadata_picture_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_Picture * obj)1871 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1872 {
1873 FLAC__uint32 x;
1874
1875 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1876
1877 /* read type */
1878 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1879 return false; /* read_callback_ sets the state for us */
1880 obj->type = x;
1881
1882 /* read MIME type */
1883 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1884 return false; /* read_callback_ sets the state for us */
1885 if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
1886 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1887 return false;
1888 }
1889 if(x > 0) {
1890 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1891 return false; /* read_callback_ sets the state for us */
1892 }
1893 obj->mime_type[x] = '\0';
1894
1895 /* read description */
1896 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1897 return false; /* read_callback_ sets the state for us */
1898 if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
1899 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1900 return false;
1901 }
1902 if(x > 0) {
1903 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1904 return false; /* read_callback_ sets the state for us */
1905 }
1906 obj->description[x] = '\0';
1907
1908 /* read width */
1909 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1910 return false; /* read_callback_ sets the state for us */
1911
1912 /* read height */
1913 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1914 return false; /* read_callback_ sets the state for us */
1915
1916 /* read depth */
1917 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1918 return false; /* read_callback_ sets the state for us */
1919
1920 /* read colors */
1921 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1922 return false; /* read_callback_ sets the state for us */
1923
1924 /* read data */
1925 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1926 return false; /* read_callback_ sets the state for us */
1927 if(0 == (obj->data = safe_malloc_(obj->data_length))) {
1928 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1929 return false;
1930 }
1931 if(obj->data_length > 0) {
1932 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1933 return false; /* read_callback_ sets the state for us */
1934 }
1935
1936 return true;
1937 }
1938
skip_id3v2_tag_(FLAC__StreamDecoder * decoder)1939 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1940 {
1941 FLAC__uint32 x;
1942 uint32_t i, skip;
1943
1944 /* skip the version and flags bytes */
1945 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1946 return false; /* read_callback_ sets the state for us */
1947 /* get the size (in bytes) to skip */
1948 skip = 0;
1949 for(i = 0; i < 4; i++) {
1950 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1951 return false; /* read_callback_ sets the state for us */
1952 skip <<= 7;
1953 skip |= (x & 0x7f);
1954 }
1955 /* skip the rest of the tag */
1956 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1957 return false; /* read_callback_ sets the state for us */
1958 return true;
1959 }
1960
frame_sync_(FLAC__StreamDecoder * decoder)1961 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1962 {
1963 FLAC__uint32 x;
1964 FLAC__bool first = true;
1965
1966 /* If we know the total number of samples in the stream, stop if we've read that many. */
1967 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1968 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1969 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1970 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1971 return true;
1972 }
1973 }
1974
1975 /* make sure we're byte aligned */
1976 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1977 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1978 return false; /* read_callback_ sets the state for us */
1979 }
1980
1981 while(1) {
1982 if(decoder->private_->cached) {
1983 x = (FLAC__uint32)decoder->private_->lookahead;
1984 decoder->private_->cached = false;
1985 }
1986 else {
1987 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1988 return false; /* read_callback_ sets the state for us */
1989 }
1990 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1991 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1992 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1993 return false; /* read_callback_ sets the state for us */
1994
1995 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1996 /* else we have to check if the second byte is the end of a sync code */
1997 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1998 decoder->private_->lookahead = (FLAC__byte)x;
1999 decoder->private_->cached = true;
2000 }
2001 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
2002 decoder->private_->header_warmup[1] = (FLAC__byte)x;
2003 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
2004 return true;
2005 }
2006 }
2007 if(first) {
2008 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2009 first = false;
2010 }
2011 }
2012
2013 return true;
2014 }
2015
read_frame_(FLAC__StreamDecoder * decoder,FLAC__bool * got_a_frame,FLAC__bool do_full_decode)2016 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2017 {
2018 uint32_t channel;
2019 uint32_t i;
2020 FLAC__int32 mid, side;
2021 uint32_t frame_crc; /* the one we calculate from the input stream */
2022 FLAC__uint32 x;
2023
2024 *got_a_frame = false;
2025
2026 /* init the CRC */
2027 frame_crc = 0;
2028 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2029 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2030 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2031
2032 if(!read_frame_header_(decoder))
2033 return false;
2034 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2035 return true;
2036 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2037 return false;
2038 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2039 /*
2040 * first figure the correct bits-per-sample of the subframe
2041 */
2042 uint32_t bps = decoder->private_->frame.header.bits_per_sample;
2043 switch(decoder->private_->frame.header.channel_assignment) {
2044 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2045 /* no adjustment needed */
2046 break;
2047 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2048 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2049 if(channel == 1)
2050 bps++;
2051 break;
2052 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2053 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2054 if(channel == 0)
2055 bps++;
2056 break;
2057 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2058 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2059 if(channel == 1)
2060 bps++;
2061 break;
2062 default:
2063 FLAC__ASSERT(0);
2064 }
2065 /*
2066 * now read it
2067 */
2068 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2069 return false;
2070 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2071 return true;
2072 }
2073 if(!read_zero_padding_(decoder))
2074 return false;
2075 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */
2076 return true;
2077
2078 /*
2079 * Read the frame CRC-16 from the footer and check
2080 */
2081 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2082 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2083 return false; /* read_callback_ sets the state for us */
2084 if(frame_crc == x) {
2085 if(do_full_decode) {
2086 /* Undo any special channel coding */
2087 switch(decoder->private_->frame.header.channel_assignment) {
2088 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2089 /* do nothing */
2090 break;
2091 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2092 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2093 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2094 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2095 break;
2096 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2097 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2098 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2099 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2100 break;
2101 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2102 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2103 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2104 #if 1
2105 mid = decoder->private_->output[0][i];
2106 side = decoder->private_->output[1][i];
2107 mid = ((uint32_t) mid) << 1;
2108 mid |= (side & 1); /* i.e. if 'side' is odd... */
2109 decoder->private_->output[0][i] = (mid + side) >> 1;
2110 decoder->private_->output[1][i] = (mid - side) >> 1;
2111 #else
2112 /* OPT: without 'side' temp variable */
2113 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2114 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2115 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2116 #endif
2117 }
2118 break;
2119 default:
2120 FLAC__ASSERT(0);
2121 break;
2122 }
2123 }
2124 }
2125 else {
2126 /* Bad frame, emit error and zero the output signal */
2127 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2128 if(do_full_decode) {
2129 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2130 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2131 }
2132 }
2133 }
2134
2135 *got_a_frame = true;
2136
2137 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2138 if(decoder->private_->next_fixed_block_size)
2139 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2140
2141 /* put the latest values into the public section of the decoder instance */
2142 decoder->protected_->channels = decoder->private_->frame.header.channels;
2143 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2144 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2145 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2146 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2147
2148 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2149 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2150
2151 /* write it */
2152 if(do_full_decode) {
2153 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
2154 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2155 return false;
2156 }
2157 }
2158
2159 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2160 return true;
2161 }
2162
read_frame_header_(FLAC__StreamDecoder * decoder)2163 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2164 {
2165 FLAC__uint32 x;
2166 FLAC__uint64 xx;
2167 uint32_t i, blocksize_hint = 0, sample_rate_hint = 0;
2168 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2169 uint32_t raw_header_len;
2170 FLAC__bool is_unparseable = false;
2171
2172 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2173
2174 /* init the raw header with the saved bits from synchronization */
2175 raw_header[0] = decoder->private_->header_warmup[0];
2176 raw_header[1] = decoder->private_->header_warmup[1];
2177 raw_header_len = 2;
2178
2179 /* check to make sure that reserved bit is 0 */
2180 if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2181 is_unparseable = true;
2182
2183 /*
2184 * Note that along the way as we read the header, we look for a sync
2185 * code inside. If we find one it would indicate that our original
2186 * sync was bad since there cannot be a sync code in a valid header.
2187 *
2188 * Three kinds of things can go wrong when reading the frame header:
2189 * 1) We may have sync'ed incorrectly and not landed on a frame header.
2190 * If we don't find a sync code, it can end up looking like we read
2191 * a valid but unparseable header, until getting to the frame header
2192 * CRC. Even then we could get a false positive on the CRC.
2193 * 2) We may have sync'ed correctly but on an unparseable frame (from a
2194 * future encoder).
2195 * 3) We may be on a damaged frame which appears valid but unparseable.
2196 *
2197 * For all these reasons, we try and read a complete frame header as
2198 * long as it seems valid, even if unparseable, up until the frame
2199 * header CRC.
2200 */
2201
2202 /*
2203 * read in the raw header as bytes so we can CRC it, and parse it on the way
2204 */
2205 for(i = 0; i < 2; i++) {
2206 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2207 return false; /* read_callback_ sets the state for us */
2208 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2209 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2210 decoder->private_->lookahead = (FLAC__byte)x;
2211 decoder->private_->cached = true;
2212 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2213 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2214 return true;
2215 }
2216 raw_header[raw_header_len++] = (FLAC__byte)x;
2217 }
2218
2219 switch(x = raw_header[2] >> 4) {
2220 case 0:
2221 is_unparseable = true;
2222 break;
2223 case 1:
2224 decoder->private_->frame.header.blocksize = 192;
2225 break;
2226 case 2:
2227 case 3:
2228 case 4:
2229 case 5:
2230 decoder->private_->frame.header.blocksize = 576 << (x-2);
2231 break;
2232 case 6:
2233 case 7:
2234 blocksize_hint = x;
2235 break;
2236 case 8:
2237 case 9:
2238 case 10:
2239 case 11:
2240 case 12:
2241 case 13:
2242 case 14:
2243 case 15:
2244 decoder->private_->frame.header.blocksize = 256 << (x-8);
2245 break;
2246 default:
2247 FLAC__ASSERT(0);
2248 break;
2249 }
2250
2251 switch(x = raw_header[2] & 0x0f) {
2252 case 0:
2253 if(decoder->private_->has_stream_info)
2254 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2255 else
2256 is_unparseable = true;
2257 break;
2258 case 1:
2259 decoder->private_->frame.header.sample_rate = 88200;
2260 break;
2261 case 2:
2262 decoder->private_->frame.header.sample_rate = 176400;
2263 break;
2264 case 3:
2265 decoder->private_->frame.header.sample_rate = 192000;
2266 break;
2267 case 4:
2268 decoder->private_->frame.header.sample_rate = 8000;
2269 break;
2270 case 5:
2271 decoder->private_->frame.header.sample_rate = 16000;
2272 break;
2273 case 6:
2274 decoder->private_->frame.header.sample_rate = 22050;
2275 break;
2276 case 7:
2277 decoder->private_->frame.header.sample_rate = 24000;
2278 break;
2279 case 8:
2280 decoder->private_->frame.header.sample_rate = 32000;
2281 break;
2282 case 9:
2283 decoder->private_->frame.header.sample_rate = 44100;
2284 break;
2285 case 10:
2286 decoder->private_->frame.header.sample_rate = 48000;
2287 break;
2288 case 11:
2289 decoder->private_->frame.header.sample_rate = 96000;
2290 break;
2291 case 12:
2292 case 13:
2293 case 14:
2294 sample_rate_hint = x;
2295 break;
2296 case 15:
2297 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2298 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2299 return true;
2300 default:
2301 FLAC__ASSERT(0);
2302 }
2303
2304 x = (uint32_t)(raw_header[3] >> 4);
2305 if(x & 8) {
2306 decoder->private_->frame.header.channels = 2;
2307 switch(x & 7) {
2308 case 0:
2309 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2310 break;
2311 case 1:
2312 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2313 break;
2314 case 2:
2315 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2316 break;
2317 default:
2318 is_unparseable = true;
2319 break;
2320 }
2321 }
2322 else {
2323 decoder->private_->frame.header.channels = (uint32_t)x + 1;
2324 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2325 }
2326
2327 switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) {
2328 case 0:
2329 if(decoder->private_->has_stream_info)
2330 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2331 else
2332 is_unparseable = true;
2333 break;
2334 case 1:
2335 decoder->private_->frame.header.bits_per_sample = 8;
2336 break;
2337 case 2:
2338 decoder->private_->frame.header.bits_per_sample = 12;
2339 break;
2340 case 4:
2341 decoder->private_->frame.header.bits_per_sample = 16;
2342 break;
2343 case 5:
2344 decoder->private_->frame.header.bits_per_sample = 20;
2345 break;
2346 case 6:
2347 decoder->private_->frame.header.bits_per_sample = 24;
2348 break;
2349 case 3:
2350 case 7:
2351 is_unparseable = true;
2352 break;
2353 default:
2354 FLAC__ASSERT(0);
2355 break;
2356 }
2357
2358 /* check to make sure that reserved bit is 0 */
2359 if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2360 is_unparseable = true;
2361
2362 /* read the frame's starting sample number (or frame number as the case may be) */
2363 if(
2364 raw_header[1] & 0x01 ||
2365 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
2366 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2367 ) { /* variable blocksize */
2368 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2369 return false; /* read_callback_ sets the state for us */
2370 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2371 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2372 decoder->private_->cached = true;
2373 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2374 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2375 return true;
2376 }
2377 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2378 decoder->private_->frame.header.number.sample_number = xx;
2379 }
2380 else { /* fixed blocksize */
2381 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2382 return false; /* read_callback_ sets the state for us */
2383 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2384 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2385 decoder->private_->cached = true;
2386 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2387 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2388 return true;
2389 }
2390 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2391 decoder->private_->frame.header.number.frame_number = x;
2392 }
2393
2394 if(blocksize_hint) {
2395 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2396 return false; /* read_callback_ sets the state for us */
2397 raw_header[raw_header_len++] = (FLAC__byte)x;
2398 if(blocksize_hint == 7) {
2399 FLAC__uint32 _x;
2400 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2401 return false; /* read_callback_ sets the state for us */
2402 raw_header[raw_header_len++] = (FLAC__byte)_x;
2403 x = (x << 8) | _x;
2404 }
2405 decoder->private_->frame.header.blocksize = x+1;
2406 }
2407
2408 if(sample_rate_hint) {
2409 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2410 return false; /* read_callback_ sets the state for us */
2411 raw_header[raw_header_len++] = (FLAC__byte)x;
2412 if(sample_rate_hint != 12) {
2413 FLAC__uint32 _x;
2414 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2415 return false; /* read_callback_ sets the state for us */
2416 raw_header[raw_header_len++] = (FLAC__byte)_x;
2417 x = (x << 8) | _x;
2418 }
2419 if(sample_rate_hint == 12)
2420 decoder->private_->frame.header.sample_rate = x*1000;
2421 else if(sample_rate_hint == 13)
2422 decoder->private_->frame.header.sample_rate = x;
2423 else
2424 decoder->private_->frame.header.sample_rate = x*10;
2425 }
2426
2427 /* read the CRC-8 byte */
2428 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2429 return false; /* read_callback_ sets the state for us */
2430 crc8 = (FLAC__byte)x;
2431
2432 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2433 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2434 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2435 return true;
2436 }
2437
2438 /* calculate the sample number from the frame number if needed */
2439 decoder->private_->next_fixed_block_size = 0;
2440 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2441 x = decoder->private_->frame.header.number.frame_number;
2442 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2443 if(decoder->private_->fixed_block_size)
2444 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2445 else if(decoder->private_->has_stream_info) {
2446 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2447 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2448 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2449 }
2450 else
2451 is_unparseable = true;
2452 }
2453 else if(x == 0) {
2454 decoder->private_->frame.header.number.sample_number = 0;
2455 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2456 }
2457 else {
2458 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2459 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2460 }
2461 }
2462
2463 if(is_unparseable) {
2464 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2465 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2466 return true;
2467 }
2468
2469 return true;
2470 }
2471
read_subframe_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2472 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2473 {
2474 FLAC__uint32 x;
2475 FLAC__bool wasted_bits;
2476 uint32_t i;
2477
2478 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2479 return false; /* read_callback_ sets the state for us */
2480
2481 wasted_bits = (x & 1);
2482 x &= 0xfe;
2483
2484 if(wasted_bits) {
2485 uint32_t u;
2486 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2487 return false; /* read_callback_ sets the state for us */
2488 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2489 if (decoder->private_->frame.subframes[channel].wasted_bits >= bps)
2490 return false;
2491 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2492 }
2493 else
2494 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2495
2496 /*
2497 * Lots of magic numbers here
2498 */
2499 if(x & 0x80) {
2500 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2501 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2502 return true;
2503 }
2504 else if(x == 0) {
2505 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2506 return false;
2507 }
2508 else if(x == 2) {
2509 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2510 return false;
2511 }
2512 else if(x < 16) {
2513 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2514 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2515 return true;
2516 }
2517 else if(x <= 24) {
2518 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2519 return false;
2520 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2521 return true;
2522 }
2523 else if(x < 64) {
2524 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2525 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2526 return true;
2527 }
2528 else {
2529 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2530 return false;
2531 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2532 return true;
2533 }
2534
2535 if(wasted_bits && do_full_decode) {
2536 x = decoder->private_->frame.subframes[channel].wasted_bits;
2537 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2538 uint32_t val = decoder->private_->output[channel][i];
2539 decoder->private_->output[channel][i] = (val << x);
2540 }
2541 }
2542
2543 return true;
2544 }
2545
read_subframe_constant_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2546 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2547 {
2548 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2549 FLAC__int32 x;
2550 uint32_t i;
2551 FLAC__int32 *output = decoder->private_->output[channel];
2552
2553 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2554
2555 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2556 return false; /* read_callback_ sets the state for us */
2557
2558 subframe->value = x;
2559
2560 /* decode the subframe */
2561 if(do_full_decode) {
2562 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2563 output[i] = x;
2564 }
2565
2566 return true;
2567 }
2568
read_subframe_fixed_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,const uint32_t order,FLAC__bool do_full_decode)2569 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2570 {
2571 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2572 FLAC__int32 i32;
2573 FLAC__uint32 u32;
2574 uint32_t u;
2575
2576 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2577
2578 subframe->residual = decoder->private_->residual[channel];
2579 subframe->order = order;
2580
2581 /* read warm-up samples */
2582 for(u = 0; u < order; u++) {
2583 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2584 return false; /* read_callback_ sets the state for us */
2585 subframe->warmup[u] = i32;
2586 }
2587
2588 /* read entropy coding method info */
2589 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2590 return false; /* read_callback_ sets the state for us */
2591 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2592 switch(subframe->entropy_coding_method.type) {
2593 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2594 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2595 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2596 return false; /* read_callback_ sets the state for us */
2597 if(decoder->private_->frame.header.blocksize >> u32 < order) {
2598 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2599 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2600 return true;
2601 }
2602 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2603 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2604 break;
2605 default:
2606 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2607 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2608 return true;
2609 }
2610
2611 /* read residual */
2612 switch(subframe->entropy_coding_method.type) {
2613 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2614 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2615 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2616 return false;
2617 break;
2618 default:
2619 FLAC__ASSERT(0);
2620 }
2621
2622 /* decode the subframe */
2623 if(do_full_decode) {
2624 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2625 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2626 }
2627
2628 return true;
2629 }
2630
read_subframe_lpc_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,const uint32_t order,FLAC__bool do_full_decode)2631 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2632 {
2633 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2634 FLAC__int32 i32;
2635 FLAC__uint32 u32;
2636 uint32_t u;
2637
2638 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2639
2640 subframe->residual = decoder->private_->residual[channel];
2641 subframe->order = order;
2642
2643 /* read warm-up samples */
2644 for(u = 0; u < order; u++) {
2645 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2646 return false; /* read_callback_ sets the state for us */
2647 subframe->warmup[u] = i32;
2648 }
2649
2650 /* read qlp coeff precision */
2651 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2652 return false; /* read_callback_ sets the state for us */
2653 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2654 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2655 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2656 return true;
2657 }
2658 subframe->qlp_coeff_precision = u32+1;
2659
2660 /* read qlp shift */
2661 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2662 return false; /* read_callback_ sets the state for us */
2663 if(i32 < 0) {
2664 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2665 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2666 return true;
2667 }
2668 subframe->quantization_level = i32;
2669
2670 /* read quantized lp coefficiencts */
2671 for(u = 0; u < order; u++) {
2672 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2673 return false; /* read_callback_ sets the state for us */
2674 subframe->qlp_coeff[u] = i32;
2675 }
2676
2677 /* read entropy coding method info */
2678 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2679 return false; /* read_callback_ sets the state for us */
2680 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2681 switch(subframe->entropy_coding_method.type) {
2682 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2683 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2684 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2685 return false; /* read_callback_ sets the state for us */
2686 if(decoder->private_->frame.header.blocksize >> u32 < order) {
2687 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2688 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2689 return true;
2690 }
2691 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2692 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2693 break;
2694 default:
2695 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2696 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2697 return true;
2698 }
2699
2700 /* read residual */
2701 switch(subframe->entropy_coding_method.type) {
2702 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2703 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2704 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2705 return false;
2706 break;
2707 default:
2708 FLAC__ASSERT(0);
2709 }
2710
2711 /* decode the subframe */
2712 if(do_full_decode) {
2713 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2714 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2715 if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
2716 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2717 else
2718 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2719 else
2720 decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2721 }
2722
2723 return true;
2724 }
2725
read_subframe_verbatim_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2726 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2727 {
2728 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2729 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2730 uint32_t i;
2731
2732 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2733
2734 subframe->data = residual;
2735
2736 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2737 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2738 return false; /* read_callback_ sets the state for us */
2739 residual[i] = x;
2740 }
2741
2742 /* decode the subframe */
2743 if(do_full_decode)
2744 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2745
2746 return true;
2747 }
2748
read_residual_partitioned_rice_(FLAC__StreamDecoder * decoder,uint32_t predictor_order,uint32_t partition_order,FLAC__EntropyCodingMethod_PartitionedRiceContents * partitioned_rice_contents,FLAC__int32 * residual,FLAC__bool is_extended)2749 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2750 {
2751 FLAC__uint32 rice_parameter;
2752 int i;
2753 uint32_t partition, sample, u;
2754 const uint32_t partitions = 1u << partition_order;
2755 const uint32_t partition_samples = decoder->private_->frame.header.blocksize >> partition_order;
2756 const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2757 const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2758
2759 /* invalid predictor and partition orders mush be handled in the callers */
2760 FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order);
2761
2762 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
2763 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2764 return false;
2765 }
2766
2767 sample = 0;
2768 for(partition = 0; partition < partitions; partition++) {
2769 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2770 return false; /* read_callback_ sets the state for us */
2771 partitioned_rice_contents->parameters[partition] = rice_parameter;
2772 if(rice_parameter < pesc) {
2773 partitioned_rice_contents->raw_bits[partition] = 0;
2774 u = (partition == 0) ? partition_samples - predictor_order : partition_samples;
2775 if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2776 return false; /* read_callback_ sets the state for us */
2777 sample += u;
2778 }
2779 else {
2780 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2781 return false; /* read_callback_ sets the state for us */
2782 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2783 for(u = (partition == 0)? predictor_order : 0; u < partition_samples; u++, sample++) {
2784 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2785 return false; /* read_callback_ sets the state for us */
2786 residual[sample] = i;
2787 }
2788 }
2789 }
2790
2791 return true;
2792 }
2793
read_zero_padding_(FLAC__StreamDecoder * decoder)2794 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2795 {
2796 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2797 FLAC__uint32 zero = 0;
2798 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2799 return false; /* read_callback_ sets the state for us */
2800 if(zero != 0) {
2801 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2802 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2803 }
2804 }
2805 return true;
2806 }
2807
read_callback_(FLAC__byte buffer[],size_t * bytes,void * client_data)2808 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2809 {
2810 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2811
2812 if(
2813 #if FLAC__HAS_OGG
2814 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2815 !decoder->private_->is_ogg &&
2816 #endif
2817 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2818 ) {
2819 *bytes = 0;
2820 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2821 return false;
2822 }
2823 else if(*bytes > 0) {
2824 /* While seeking, it is possible for our seek to land in the
2825 * middle of audio data that looks exactly like a frame header
2826 * from a future version of an encoder. When that happens, our
2827 * error callback will get an
2828 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2829 * unparseable_frame_count. But there is a remote possibility
2830 * that it is properly synced at such a "future-codec frame",
2831 * so to make sure, we wait to see many "unparseable" errors in
2832 * a row before bailing out.
2833 */
2834 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2835 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2836 return false;
2837 }
2838 else {
2839 const FLAC__StreamDecoderReadStatus status =
2840 #if FLAC__HAS_OGG
2841 decoder->private_->is_ogg?
2842 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2843 #endif
2844 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2845 ;
2846 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2847 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2848 return false;
2849 }
2850 else if(*bytes == 0) {
2851 if(
2852 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2853 (
2854 #if FLAC__HAS_OGG
2855 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2856 !decoder->private_->is_ogg &&
2857 #endif
2858 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2859 )
2860 ) {
2861 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2862 return false;
2863 }
2864 else
2865 return true;
2866 }
2867 else
2868 return true;
2869 }
2870 }
2871 else {
2872 /* abort to avoid a deadlock */
2873 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2874 return false;
2875 }
2876 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2877 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync
2878 * and at the same time hit the end of the stream (for example, seeking
2879 * to a point that is after the beginning of the last Ogg page). There
2880 * is no way to report an Ogg sync loss through the callbacks (see note
2881 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2882 * So to keep the decoder from stopping at this point we gate the call
2883 * to the eof_callback and let the Ogg decoder aspect set the
2884 * end-of-stream state when it is needed.
2885 */
2886 }
2887
2888 #if FLAC__HAS_OGG
read_callback_ogg_aspect_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes)2889 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2890 {
2891 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2892 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2893 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2894 /* we don't really have a way to handle lost sync via read
2895 * callback so we'll let it pass and let the underlying
2896 * FLAC decoder catch the error
2897 */
2898 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2899 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2900 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2901 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2902 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2903 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2904 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2905 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2906 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2907 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2908 default:
2909 FLAC__ASSERT(0);
2910 /* double protection */
2911 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2912 }
2913 }
2914
read_callback_proxy_(const void * void_decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)2915 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2916 {
2917 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2918
2919 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2920 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2921 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2922 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2923 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2924 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2925 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2926 default:
2927 /* double protection: */
2928 FLAC__ASSERT(0);
2929 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2930 }
2931 }
2932 #endif
2933
write_audio_frame_to_client_(FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[])2934 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2935 {
2936 if(decoder->private_->is_seeking) {
2937 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2938 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2939 FLAC__uint64 target_sample = decoder->private_->target_sample;
2940
2941 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2942
2943 #if FLAC__HAS_OGG
2944 decoder->private_->got_a_frame = true;
2945 #endif
2946 decoder->private_->last_frame = *frame; /* save the frame */
2947 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2948 uint32_t delta = (uint32_t)(target_sample - this_frame_sample);
2949 /* kick out of seek mode */
2950 decoder->private_->is_seeking = false;
2951 /* shift out the samples before target_sample */
2952 if(delta > 0) {
2953 uint32_t channel;
2954 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2955 for(channel = 0; channel < frame->header.channels; channel++)
2956 newbuffer[channel] = buffer[channel] + delta;
2957 decoder->private_->last_frame.header.blocksize -= delta;
2958 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2959 /* write the relevant samples */
2960 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2961 }
2962 else {
2963 /* write the relevant samples */
2964 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2965 }
2966 }
2967 else {
2968 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2969 }
2970 }
2971 else {
2972 /*
2973 * If we never got STREAMINFO, turn off MD5 checking to save
2974 * cycles since we don't have a sum to compare to anyway
2975 */
2976 if(!decoder->private_->has_stream_info)
2977 decoder->private_->do_md5_checking = false;
2978 if(decoder->private_->do_md5_checking) {
2979 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2980 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2981 }
2982 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2983 }
2984 }
2985
send_error_to_client_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status)2986 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2987 {
2988 if(!decoder->private_->is_seeking)
2989 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2990 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2991 decoder->private_->unparseable_frame_count++;
2992 }
2993
seek_to_absolute_sample_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)2994 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2995 {
2996 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2997 FLAC__int64 pos = -1;
2998 int i;
2999 uint32_t approx_bytes_per_frame;
3000 FLAC__bool first_seek = true;
3001 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
3002 const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
3003 const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
3004 const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
3005 const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
3006 /* take these from the current frame in case they've changed mid-stream */
3007 uint32_t channels = FLAC__stream_decoder_get_channels(decoder);
3008 uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
3009 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
3010
3011 /* use values from stream info if we didn't decode a frame */
3012 if(channels == 0)
3013 channels = decoder->private_->stream_info.data.stream_info.channels;
3014 if(bps == 0)
3015 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3016
3017 /* we are just guessing here */
3018 if(max_framesize > 0)
3019 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3020 /*
3021 * Check if it's a known fixed-blocksize stream. Note that though
3022 * the spec doesn't allow zeroes in the STREAMINFO block, we may
3023 * never get a STREAMINFO block when decoding so the value of
3024 * min_blocksize might be zero.
3025 */
3026 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3027 /* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */
3028 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3029 }
3030 else
3031 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3032
3033 /*
3034 * First, we set an upper and lower bound on where in the
3035 * stream we will search. For now we assume the worst case
3036 * scenario, which is our best guess at the beginning of
3037 * the first frame and end of the stream.
3038 */
3039 lower_bound = first_frame_offset;
3040 lower_bound_sample = 0;
3041 upper_bound = stream_length;
3042 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3043
3044 /*
3045 * Now we refine the bounds if we have a seektable with
3046 * suitable points. Note that according to the spec they
3047 * must be ordered by ascending sample number.
3048 *
3049 * Note: to protect against invalid seek tables we will ignore points
3050 * that have frame_samples==0 or sample_number>=total_samples
3051 */
3052 if(seek_table) {
3053 FLAC__uint64 new_lower_bound = lower_bound;
3054 FLAC__uint64 new_upper_bound = upper_bound;
3055 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3056 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3057
3058 /* find the closest seek point <= target_sample, if it exists */
3059 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3060 if(
3061 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3062 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3063 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3064 seek_table->points[i].sample_number <= target_sample
3065 )
3066 break;
3067 }
3068 if(i >= 0) { /* i.e. we found a suitable seek point... */
3069 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3070 new_lower_bound_sample = seek_table->points[i].sample_number;
3071 }
3072
3073 /* find the closest seek point > target_sample, if it exists */
3074 for(i = 0; i < (int)seek_table->num_points; i++) {
3075 if(
3076 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3077 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3078 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3079 seek_table->points[i].sample_number > target_sample
3080 )
3081 break;
3082 }
3083 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3084 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3085 new_upper_bound_sample = seek_table->points[i].sample_number;
3086 }
3087 /* final protection against unsorted seek tables; keep original values if bogus */
3088 if(new_upper_bound >= new_lower_bound) {
3089 lower_bound = new_lower_bound;
3090 upper_bound = new_upper_bound;
3091 lower_bound_sample = new_lower_bound_sample;
3092 upper_bound_sample = new_upper_bound_sample;
3093 }
3094 }
3095
3096 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3097 /* there are 2 insidious ways that the following equality occurs, which
3098 * we need to fix:
3099 * 1) total_samples is 0 (unknown) and target_sample is 0
3100 * 2) total_samples is 0 (unknown) and target_sample happens to be
3101 * exactly equal to the last seek point in the seek table; this
3102 * means there is no seek point above it, and upper_bound_samples
3103 * remains equal to the estimate (of target_samples) we made above
3104 * in either case it does not hurt to move upper_bound_sample up by 1
3105 */
3106 if(upper_bound_sample == lower_bound_sample)
3107 upper_bound_sample++;
3108
3109 decoder->private_->target_sample = target_sample;
3110 while(1) {
3111 /* check if the bounds are still ok */
3112 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3113 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3114 return false;
3115 }
3116 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3117 pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3118 #else
3119 /* a little less accurate: */
3120 if(upper_bound - lower_bound < 0xffffffff)
3121 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame;
3122 else { /* @@@ WATCHOUT, ~2TB limit */
3123 FLAC__uint64 sample_range_16 = (upper_bound_sample - lower_bound_sample) >> 16;
3124 if (sample_range_16 == 0) sample_range_16 = 1; // avoid divide by 0
3125 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) >> 8) * ((upper_bound - lower_bound) >> 8) / sample_range_16) - approx_bytes_per_frame;
3126 }
3127 #endif
3128 if(pos >= (FLAC__int64)upper_bound)
3129 pos = (FLAC__int64)upper_bound - 1;
3130 if(pos < (FLAC__int64)lower_bound)
3131 pos = (FLAC__int64)lower_bound;
3132 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3133 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3134 return false;
3135 }
3136 if(!FLAC__stream_decoder_flush(decoder)) {
3137 /* above call sets the state for us */
3138 return false;
3139 }
3140 /* Now we need to get a frame. First we need to reset our
3141 * unparseable_frame_count; if we get too many unparseable
3142 * frames in a row, the read callback will return
3143 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3144 * FLAC__stream_decoder_process_single() to return false.
3145 */
3146 decoder->private_->unparseable_frame_count = 0;
3147 if(!FLAC__stream_decoder_process_single(decoder) ||
3148 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
3149 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3150 return false;
3151 }
3152 /* our write callback will change the state when it gets to the target frame */
3153 /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */
3154 #if 0
3155 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3156 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3157 break;
3158 #endif
3159 if(!decoder->private_->is_seeking)
3160 break;
3161
3162 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3163 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3164
3165 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3166 if (pos == (FLAC__int64)lower_bound) {
3167 /* can't move back any more than the first frame, something is fatally wrong */
3168 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3169 return false;
3170 }
3171 /* our last move backwards wasn't big enough, try again */
3172 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
3173 continue;
3174 }
3175 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3176 first_seek = false;
3177
3178 /* make sure we are not seeking in corrupted stream */
3179 if (this_frame_sample < lower_bound_sample) {
3180 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3181 return false;
3182 }
3183
3184 /* we need to narrow the search */
3185 if(target_sample < this_frame_sample) {
3186 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3187 /*@@@@@@ what will decode position be if at end of stream? */
3188 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3189 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3190 return false;
3191 }
3192 approx_bytes_per_frame = (uint32_t)(2 * (upper_bound - pos) / 3 + 16);
3193 }
3194 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3195 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3196 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3197 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3198 return false;
3199 }
3200 approx_bytes_per_frame = (uint32_t)(2 * (lower_bound - pos) / 3 + 16);
3201 }
3202 }
3203
3204 return true;
3205 }
3206
3207 #if FLAC__HAS_OGG
seek_to_absolute_sample_ogg_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)3208 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3209 {
3210 FLAC__uint64 left_pos = 0, right_pos = stream_length;
3211 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3212 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1;
3213 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3214 FLAC__bool did_a_seek;
3215 uint32_t iteration = 0;
3216
3217 /* In the first iterations, we will calculate the target byte position
3218 * by the distance from the target sample to left_sample and
3219 * right_sample (let's call it "proportional search"). After that, we
3220 * will switch to binary search.
3221 */
3222 uint32_t BINARY_SEARCH_AFTER_ITERATION = 2;
3223
3224 /* We will switch to a linear search once our current sample is less
3225 * than this number of samples ahead of the target sample
3226 */
3227 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3228
3229 /* If the total number of samples is unknown, use a large value, and
3230 * force binary search immediately.
3231 */
3232 if(right_sample == 0) {
3233 right_sample = (FLAC__uint64)(-1);
3234 BINARY_SEARCH_AFTER_ITERATION = 0;
3235 }
3236
3237 decoder->private_->target_sample = target_sample;
3238 for( ; ; iteration++) {
3239 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3240 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3241 pos = (right_pos + left_pos) / 2;
3242 }
3243 else {
3244 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3245 pos = (FLAC__uint64)((double)(target_sample - left_sample) / (double)(right_sample - left_sample) * (double)(right_pos - left_pos));
3246 #else
3247 /* a little less accurate: */
3248 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3249 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3250 else /* @@@ WATCHOUT, ~2TB limit */
3251 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3252 #endif
3253 /* @@@ TODO: might want to limit pos to some distance
3254 * before EOF, to make sure we land before the last frame,
3255 * thereby getting a this_frame_sample and so having a better
3256 * estimate.
3257 */
3258 }
3259
3260 /* physical seek */
3261 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3262 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3263 return false;
3264 }
3265 if(!FLAC__stream_decoder_flush(decoder)) {
3266 /* above call sets the state for us */
3267 return false;
3268 }
3269 did_a_seek = true;
3270 }
3271 else
3272 did_a_seek = false;
3273
3274 decoder->private_->got_a_frame = false;
3275 if(!FLAC__stream_decoder_process_single(decoder) ||
3276 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
3277 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3278 return false;
3279 }
3280 if(!decoder->private_->got_a_frame) {
3281 if(did_a_seek) {
3282 /* this can happen if we seek to a point after the last frame; we drop
3283 * to binary search right away in this case to avoid any wasted
3284 * iterations of proportional search.
3285 */
3286 right_pos = pos;
3287 BINARY_SEARCH_AFTER_ITERATION = 0;
3288 }
3289 else {
3290 /* this can probably only happen if total_samples is unknown and the
3291 * target_sample is past the end of the stream
3292 */
3293 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3294 return false;
3295 }
3296 }
3297 /* our write callback will change the state when it gets to the target frame */
3298 else if(!decoder->private_->is_seeking) {
3299 break;
3300 }
3301 else {
3302 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3303 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3304
3305 if (did_a_seek) {
3306 if (this_frame_sample <= target_sample) {
3307 /* The 'equal' case should not happen, since
3308 * FLAC__stream_decoder_process_single()
3309 * should recognize that it has hit the
3310 * target sample and we would exit through
3311 * the 'break' above.
3312 */
3313 FLAC__ASSERT(this_frame_sample != target_sample);
3314
3315 left_sample = this_frame_sample;
3316 /* sanity check to avoid infinite loop */
3317 if (left_pos == pos) {
3318 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3319 return false;
3320 }
3321 left_pos = pos;
3322 }
3323 else {
3324 right_sample = this_frame_sample;
3325 /* sanity check to avoid infinite loop */
3326 if (right_pos == pos) {
3327 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3328 return false;
3329 }
3330 right_pos = pos;
3331 }
3332 }
3333 }
3334 }
3335
3336 return true;
3337 }
3338 #endif
3339
file_read_callback_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)3340 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3341 {
3342 (void)client_data;
3343
3344 if(*bytes > 0) {
3345 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3346 if(ferror(decoder->private_->file))
3347 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3348 else if(*bytes == 0)
3349 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3350 else
3351 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3352 }
3353 else
3354 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3355 }
3356
file_seek_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 absolute_byte_offset,void * client_data)3357 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3358 {
3359 (void)client_data;
3360
3361 if(decoder->private_->file == stdin)
3362 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3363 else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0)
3364 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3365 else
3366 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3367 }
3368
file_tell_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * absolute_byte_offset,void * client_data)3369 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3370 {
3371 FLAC__off_t pos;
3372 (void)client_data;
3373
3374 if(decoder->private_->file == stdin)
3375 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3376 else if((pos = ftello(decoder->private_->file)) < 0)
3377 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3378 else {
3379 *absolute_byte_offset = (FLAC__uint64)pos;
3380 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3381 }
3382 }
3383
file_length_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * stream_length,void * client_data)3384 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3385 {
3386 struct flac_stat_s filestats;
3387 (void)client_data;
3388
3389 if(decoder->private_->file == stdin)
3390 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3391 else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0)
3392 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3393 else {
3394 *stream_length = (FLAC__uint64)filestats.st_size;
3395 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3396 }
3397 }
3398
file_eof_callback_(const FLAC__StreamDecoder * decoder,void * client_data)3399 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3400 {
3401 (void)client_data;
3402
3403 return feof(decoder->private_->file)? true : false;
3404 }
3405
FLAC__get_decoder_client_data(FLAC__StreamDecoder * decoder)3406 FLAC_API const void *FLAC__get_decoder_client_data(FLAC__StreamDecoder *decoder)
3407 {
3408 return decoder->private_->client_data;
3409 }
3410