1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000-2009 Josh Coalson
3 * Copyright (C) 2011-2014 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 =
60 #if FLAC__HAS_OGG
61 1
62 #else
63 0
64 #endif
65 ;
66
67
68 /***********************************************************************
69 *
70 * Private static data
71 *
72 ***********************************************************************/
73
74 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
75
76 /***********************************************************************
77 *
78 * Private class method prototypes
79 *
80 ***********************************************************************/
81
82 static void set_defaults_(FLAC__StreamDecoder *decoder);
83 static FILE *get_binary_stdin_(void);
84 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
85 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
86 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
87 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
88 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
89 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
90 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length);
91 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
92 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
93 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
94 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
95 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
96 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
97 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
98 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
99 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
100 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
101 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
102 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
103 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
104 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
105 #if FLAC__HAS_OGG
106 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
107 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
108 #endif
109 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
110 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
111 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
112 #if FLAC__HAS_OGG
113 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
114 #endif
115 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
116 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
117 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
118 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
119 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
120
121 /***********************************************************************
122 *
123 * Private class data
124 *
125 ***********************************************************************/
126
127 typedef struct FLAC__StreamDecoderPrivate {
128 #if FLAC__HAS_OGG
129 FLAC__bool is_ogg;
130 #endif
131 FLAC__StreamDecoderReadCallback read_callback;
132 FLAC__StreamDecoderSeekCallback seek_callback;
133 FLAC__StreamDecoderTellCallback tell_callback;
134 FLAC__StreamDecoderLengthCallback length_callback;
135 FLAC__StreamDecoderEofCallback eof_callback;
136 FLAC__StreamDecoderWriteCallback write_callback;
137 FLAC__StreamDecoderMetadataCallback metadata_callback;
138 FLAC__StreamDecoderErrorCallback error_callback;
139 /* generic 32-bit datapath: */
140 void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
141 /* generic 64-bit datapath: */
142 void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
143 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
144 void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
145 void *client_data;
146 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
147 FLAC__BitReader *input;
148 FLAC__int32 *output[FLAC__MAX_CHANNELS];
149 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
150 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
151 unsigned output_capacity, output_channels;
152 FLAC__uint32 fixed_block_size, next_fixed_block_size;
153 FLAC__uint64 samples_decoded;
154 FLAC__bool has_stream_info, has_seek_table;
155 FLAC__StreamMetadata stream_info;
156 FLAC__StreamMetadata seek_table;
157 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
158 FLAC__byte *metadata_filter_ids;
159 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
160 FLAC__Frame frame;
161 FLAC__bool cached; /* true if there is a byte in lookahead */
162 FLAC__CPUInfo cpuinfo;
163 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
164 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
165 /* unaligned (original) pointers to allocated data */
166 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
167 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 */
168 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
169 FLAC__bool is_seeking;
170 FLAC__MD5Context md5context;
171 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
172 /* (the rest of these are only used for seeking) */
173 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
174 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
175 FLAC__uint64 target_sample;
176 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
177 #if FLAC__HAS_OGG
178 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
179 #endif
180 } FLAC__StreamDecoderPrivate;
181
182 /***********************************************************************
183 *
184 * Public static class data
185 *
186 ***********************************************************************/
187
188 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
189 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
190 "FLAC__STREAM_DECODER_READ_METADATA",
191 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
192 "FLAC__STREAM_DECODER_READ_FRAME",
193 "FLAC__STREAM_DECODER_END_OF_STREAM",
194 "FLAC__STREAM_DECODER_OGG_ERROR",
195 "FLAC__STREAM_DECODER_SEEK_ERROR",
196 "FLAC__STREAM_DECODER_ABORTED",
197 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
198 "FLAC__STREAM_DECODER_UNINITIALIZED"
199 };
200
201 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
202 "FLAC__STREAM_DECODER_INIT_STATUS_OK",
203 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
204 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
205 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
206 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
207 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
208 };
209
210 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
211 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
212 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
213 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
214 };
215
216 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
217 "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
218 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
219 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
220 };
221
222 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
223 "FLAC__STREAM_DECODER_TELL_STATUS_OK",
224 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
225 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
226 };
227
228 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
229 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
230 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
231 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
232 };
233
234 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
235 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
236 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
237 };
238
239 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
240 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
241 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
242 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
243 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
244 };
245
246 /***********************************************************************
247 *
248 * Class constructor/destructor
249 *
250 ***********************************************************************/
FLAC__stream_decoder_new(void)251 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
252 {
253 FLAC__StreamDecoder *decoder;
254 unsigned i;
255
256 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
257
258 decoder = calloc(1, sizeof(FLAC__StreamDecoder));
259 if(decoder == 0) {
260 return 0;
261 }
262
263 decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
264 if(decoder->protected_ == 0) {
265 free(decoder);
266 return 0;
267 }
268
269 decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
270 if(decoder->private_ == 0) {
271 free(decoder->protected_);
272 free(decoder);
273 return 0;
274 }
275
276 decoder->private_->input = FLAC__bitreader_new();
277 if(decoder->private_->input == 0) {
278 free(decoder->private_);
279 free(decoder->protected_);
280 free(decoder);
281 return 0;
282 }
283
284 decoder->private_->metadata_filter_ids_capacity = 16;
285 if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
286 FLAC__bitreader_delete(decoder->private_->input);
287 free(decoder->private_);
288 free(decoder->protected_);
289 free(decoder);
290 return 0;
291 }
292
293 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
294 decoder->private_->output[i] = 0;
295 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
296 }
297
298 decoder->private_->output_capacity = 0;
299 decoder->private_->output_channels = 0;
300 decoder->private_->has_seek_table = false;
301
302 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
303 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
304
305 decoder->private_->file = 0;
306
307 set_defaults_(decoder);
308
309 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
310
311 return decoder;
312 }
313
FLAC__stream_decoder_delete(FLAC__StreamDecoder * decoder)314 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
315 {
316 unsigned i;
317
318 if (decoder == NULL)
319 return ;
320
321 FLAC__ASSERT(0 != decoder->protected_);
322 FLAC__ASSERT(0 != decoder->private_);
323 FLAC__ASSERT(0 != decoder->private_->input);
324
325 (void)FLAC__stream_decoder_finish(decoder);
326
327 if(0 != decoder->private_->metadata_filter_ids)
328 free(decoder->private_->metadata_filter_ids);
329
330 FLAC__bitreader_delete(decoder->private_->input);
331
332 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
333 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
334
335 free(decoder->private_);
336 free(decoder->protected_);
337 free(decoder);
338 }
339
340 /***********************************************************************
341 *
342 * Public class methods
343 *
344 ***********************************************************************/
345
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)346 static FLAC__StreamDecoderInitStatus init_stream_internal_(
347 FLAC__StreamDecoder *decoder,
348 FLAC__StreamDecoderReadCallback read_callback,
349 FLAC__StreamDecoderSeekCallback seek_callback,
350 FLAC__StreamDecoderTellCallback tell_callback,
351 FLAC__StreamDecoderLengthCallback length_callback,
352 FLAC__StreamDecoderEofCallback eof_callback,
353 FLAC__StreamDecoderWriteCallback write_callback,
354 FLAC__StreamDecoderMetadataCallback metadata_callback,
355 FLAC__StreamDecoderErrorCallback error_callback,
356 void *client_data,
357 FLAC__bool is_ogg
358 )
359 {
360 FLAC__ASSERT(0 != decoder);
361
362 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
363 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
364
365 #if !FLAC__HAS_OGG
366 if(is_ogg)
367 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
368 #endif
369
370 if(
371 0 == read_callback ||
372 0 == write_callback ||
373 0 == error_callback ||
374 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
375 )
376 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
377
378 #if FLAC__HAS_OGG
379 decoder->private_->is_ogg = is_ogg;
380 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
381 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
382 #endif
383
384 /*
385 * get the CPU info and set the function pointers
386 */
387 FLAC__cpu_info(&decoder->private_->cpuinfo);
388 /* first default to the non-asm routines */
389 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
390 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
391 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
392 /* now override with asm where appropriate */
393 #ifndef FLAC__NO_ASM
394 if(decoder->private_->cpuinfo.use_asm) {
395 #ifdef FLAC__CPU_IA32
396 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
397 #ifdef FLAC__HAS_NASM
398 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */
399 if(decoder->private_->cpuinfo.ia32.mmx) {
400 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
401 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
402 }
403 else {
404 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
405 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
406 }
407 #endif
408 #ifdef FLAC__HAS_X86INTRIN
409 # if defined FLAC__SSE2_SUPPORTED && !defined FLAC__HAS_NASM /* OPT_SSE: not better than MMX asm */
410 if(decoder->private_->cpuinfo.ia32.sse2) {
411 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse2;
412 }
413 # endif
414 # if defined FLAC__SSE4_1_SUPPORTED
415 if(decoder->private_->cpuinfo.ia32.sse41) {
416 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41;
417 }
418 # endif
419 #endif
420 #elif defined FLAC__CPU_X86_64
421 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64);
422 /* No useful SSE optimizations yet */
423 #endif
424 }
425 #endif
426
427 /* from here on, errors are fatal */
428
429 if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
430 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
431 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
432 }
433
434 decoder->private_->read_callback = read_callback;
435 decoder->private_->seek_callback = seek_callback;
436 decoder->private_->tell_callback = tell_callback;
437 decoder->private_->length_callback = length_callback;
438 decoder->private_->eof_callback = eof_callback;
439 decoder->private_->write_callback = write_callback;
440 decoder->private_->metadata_callback = metadata_callback;
441 decoder->private_->error_callback = error_callback;
442 decoder->private_->client_data = client_data;
443 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
444 decoder->private_->samples_decoded = 0;
445 decoder->private_->has_stream_info = false;
446 decoder->private_->cached = false;
447
448 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
449 decoder->private_->is_seeking = false;
450
451 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
452 if(!FLAC__stream_decoder_reset(decoder)) {
453 /* above call sets the state for us */
454 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
455 }
456
457 return FLAC__STREAM_DECODER_INIT_STATUS_OK;
458 }
459
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)460 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
461 FLAC__StreamDecoder *decoder,
462 FLAC__StreamDecoderReadCallback read_callback,
463 FLAC__StreamDecoderSeekCallback seek_callback,
464 FLAC__StreamDecoderTellCallback tell_callback,
465 FLAC__StreamDecoderLengthCallback length_callback,
466 FLAC__StreamDecoderEofCallback eof_callback,
467 FLAC__StreamDecoderWriteCallback write_callback,
468 FLAC__StreamDecoderMetadataCallback metadata_callback,
469 FLAC__StreamDecoderErrorCallback error_callback,
470 void *client_data
471 )
472 {
473 return init_stream_internal_(
474 decoder,
475 read_callback,
476 seek_callback,
477 tell_callback,
478 length_callback,
479 eof_callback,
480 write_callback,
481 metadata_callback,
482 error_callback,
483 client_data,
484 /*is_ogg=*/false
485 );
486 }
487
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)488 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
489 FLAC__StreamDecoder *decoder,
490 FLAC__StreamDecoderReadCallback read_callback,
491 FLAC__StreamDecoderSeekCallback seek_callback,
492 FLAC__StreamDecoderTellCallback tell_callback,
493 FLAC__StreamDecoderLengthCallback length_callback,
494 FLAC__StreamDecoderEofCallback eof_callback,
495 FLAC__StreamDecoderWriteCallback write_callback,
496 FLAC__StreamDecoderMetadataCallback metadata_callback,
497 FLAC__StreamDecoderErrorCallback error_callback,
498 void *client_data
499 )
500 {
501 return init_stream_internal_(
502 decoder,
503 read_callback,
504 seek_callback,
505 tell_callback,
506 length_callback,
507 eof_callback,
508 write_callback,
509 metadata_callback,
510 error_callback,
511 client_data,
512 /*is_ogg=*/true
513 );
514 }
515
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)516 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
517 FLAC__StreamDecoder *decoder,
518 FILE *file,
519 FLAC__StreamDecoderWriteCallback write_callback,
520 FLAC__StreamDecoderMetadataCallback metadata_callback,
521 FLAC__StreamDecoderErrorCallback error_callback,
522 void *client_data,
523 FLAC__bool is_ogg
524 )
525 {
526 FLAC__ASSERT(0 != decoder);
527 FLAC__ASSERT(0 != file);
528
529 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
530 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
531
532 if(0 == write_callback || 0 == error_callback)
533 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
534
535 /*
536 * To make sure that our file does not go unclosed after an error, we
537 * must assign the FILE pointer before any further error can occur in
538 * this routine.
539 */
540 if(file == stdin)
541 file = get_binary_stdin_(); /* just to be safe */
542
543 decoder->private_->file = file;
544
545 return init_stream_internal_(
546 decoder,
547 file_read_callback_,
548 decoder->private_->file == stdin? 0: file_seek_callback_,
549 decoder->private_->file == stdin? 0: file_tell_callback_,
550 decoder->private_->file == stdin? 0: file_length_callback_,
551 file_eof_callback_,
552 write_callback,
553 metadata_callback,
554 error_callback,
555 client_data,
556 is_ogg
557 );
558 }
559
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)560 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
561 FLAC__StreamDecoder *decoder,
562 FILE *file,
563 FLAC__StreamDecoderWriteCallback write_callback,
564 FLAC__StreamDecoderMetadataCallback metadata_callback,
565 FLAC__StreamDecoderErrorCallback error_callback,
566 void *client_data
567 )
568 {
569 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
570 }
571
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)572 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
573 FLAC__StreamDecoder *decoder,
574 FILE *file,
575 FLAC__StreamDecoderWriteCallback write_callback,
576 FLAC__StreamDecoderMetadataCallback metadata_callback,
577 FLAC__StreamDecoderErrorCallback error_callback,
578 void *client_data
579 )
580 {
581 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
582 }
583
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)584 static FLAC__StreamDecoderInitStatus init_file_internal_(
585 FLAC__StreamDecoder *decoder,
586 const char *filename,
587 FLAC__StreamDecoderWriteCallback write_callback,
588 FLAC__StreamDecoderMetadataCallback metadata_callback,
589 FLAC__StreamDecoderErrorCallback error_callback,
590 void *client_data,
591 FLAC__bool is_ogg
592 )
593 {
594 FILE *file;
595
596 FLAC__ASSERT(0 != decoder);
597
598 /*
599 * To make sure that our file does not go unclosed after an error, we
600 * have to do the same entrance checks here that are later performed
601 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
602 */
603 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
604 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
605
606 if(0 == write_callback || 0 == error_callback)
607 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
608
609 file = filename? flac_fopen(filename, "rb") : stdin;
610
611 if(0 == file)
612 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
613
614 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
615 }
616
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)617 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
618 FLAC__StreamDecoder *decoder,
619 const char *filename,
620 FLAC__StreamDecoderWriteCallback write_callback,
621 FLAC__StreamDecoderMetadataCallback metadata_callback,
622 FLAC__StreamDecoderErrorCallback error_callback,
623 void *client_data
624 )
625 {
626 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
627 }
628
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)629 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
630 FLAC__StreamDecoder *decoder,
631 const char *filename,
632 FLAC__StreamDecoderWriteCallback write_callback,
633 FLAC__StreamDecoderMetadataCallback metadata_callback,
634 FLAC__StreamDecoderErrorCallback error_callback,
635 void *client_data
636 )
637 {
638 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
639 }
640
FLAC__stream_decoder_finish(FLAC__StreamDecoder * decoder)641 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
642 {
643 FLAC__bool md5_failed = false;
644 unsigned i;
645
646 FLAC__ASSERT(0 != decoder);
647 FLAC__ASSERT(0 != decoder->private_);
648 FLAC__ASSERT(0 != decoder->protected_);
649
650 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
651 return true;
652
653 /* see the comment in FLAC__stream_decoder_reset() as to why we
654 * always call FLAC__MD5Final()
655 */
656 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
657
658 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
659 free(decoder->private_->seek_table.data.seek_table.points);
660 decoder->private_->seek_table.data.seek_table.points = 0;
661 decoder->private_->has_seek_table = false;
662 }
663 FLAC__bitreader_free(decoder->private_->input);
664 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
665 /* WATCHOUT:
666 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
667 * output arrays have a buffer of up to 3 zeroes in front
668 * (at negative indices) for alignment purposes; we use 4
669 * to keep the data well-aligned.
670 */
671 if(0 != decoder->private_->output[i]) {
672 free(decoder->private_->output[i]-4);
673 decoder->private_->output[i] = 0;
674 }
675 if(0 != decoder->private_->residual_unaligned[i]) {
676 free(decoder->private_->residual_unaligned[i]);
677 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
678 }
679 }
680 decoder->private_->output_capacity = 0;
681 decoder->private_->output_channels = 0;
682
683 #if FLAC__HAS_OGG
684 if(decoder->private_->is_ogg)
685 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
686 #endif
687
688 if(0 != decoder->private_->file) {
689 if(decoder->private_->file != stdin)
690 fclose(decoder->private_->file);
691 decoder->private_->file = 0;
692 }
693
694 if(decoder->private_->do_md5_checking) {
695 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
696 md5_failed = true;
697 }
698 decoder->private_->is_seeking = false;
699
700 set_defaults_(decoder);
701
702 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
703
704 return !md5_failed;
705 }
706
FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder * decoder,long value)707 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
708 {
709 FLAC__ASSERT(0 != decoder);
710 FLAC__ASSERT(0 != decoder->private_);
711 FLAC__ASSERT(0 != decoder->protected_);
712 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
713 return false;
714 #if FLAC__HAS_OGG
715 /* can't check decoder->private_->is_ogg since that's not set until init time */
716 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
717 return true;
718 #else
719 (void)value;
720 return false;
721 #endif
722 }
723
FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder * decoder,FLAC__bool value)724 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
725 {
726 FLAC__ASSERT(0 != decoder);
727 FLAC__ASSERT(0 != decoder->protected_);
728 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
729 return false;
730 decoder->protected_->md5_checking = value;
731 return true;
732 }
733
FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)734 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
735 {
736 FLAC__ASSERT(0 != decoder);
737 FLAC__ASSERT(0 != decoder->private_);
738 FLAC__ASSERT(0 != decoder->protected_);
739 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
740 /* double protection */
741 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
742 return false;
743 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
744 return false;
745 decoder->private_->metadata_filter[type] = true;
746 if(type == FLAC__METADATA_TYPE_APPLICATION)
747 decoder->private_->metadata_filter_ids_count = 0;
748 return true;
749 }
750
FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])751 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
752 {
753 FLAC__ASSERT(0 != decoder);
754 FLAC__ASSERT(0 != decoder->private_);
755 FLAC__ASSERT(0 != decoder->protected_);
756 FLAC__ASSERT(0 != id);
757 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
758 return false;
759
760 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
761 return true;
762
763 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
764
765 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
766 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
767 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
768 return false;
769 }
770 decoder->private_->metadata_filter_ids_capacity *= 2;
771 }
772
773 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));
774 decoder->private_->metadata_filter_ids_count++;
775
776 return true;
777 }
778
FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder * decoder)779 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
780 {
781 unsigned i;
782 FLAC__ASSERT(0 != decoder);
783 FLAC__ASSERT(0 != decoder->private_);
784 FLAC__ASSERT(0 != decoder->protected_);
785 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
786 return false;
787 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
788 decoder->private_->metadata_filter[i] = true;
789 decoder->private_->metadata_filter_ids_count = 0;
790 return true;
791 }
792
FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)793 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
794 {
795 FLAC__ASSERT(0 != decoder);
796 FLAC__ASSERT(0 != decoder->private_);
797 FLAC__ASSERT(0 != decoder->protected_);
798 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
799 /* double protection */
800 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
801 return false;
802 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
803 return false;
804 decoder->private_->metadata_filter[type] = false;
805 if(type == FLAC__METADATA_TYPE_APPLICATION)
806 decoder->private_->metadata_filter_ids_count = 0;
807 return true;
808 }
809
FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])810 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
811 {
812 FLAC__ASSERT(0 != decoder);
813 FLAC__ASSERT(0 != decoder->private_);
814 FLAC__ASSERT(0 != decoder->protected_);
815 FLAC__ASSERT(0 != id);
816 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
817 return false;
818
819 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
820 return true;
821
822 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
823
824 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
825 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
826 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
827 return false;
828 }
829 decoder->private_->metadata_filter_ids_capacity *= 2;
830 }
831
832 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));
833 decoder->private_->metadata_filter_ids_count++;
834
835 return true;
836 }
837
FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder * decoder)838 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
839 {
840 FLAC__ASSERT(0 != decoder);
841 FLAC__ASSERT(0 != decoder->private_);
842 FLAC__ASSERT(0 != decoder->protected_);
843 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
844 return false;
845 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
846 decoder->private_->metadata_filter_ids_count = 0;
847 return true;
848 }
849
FLAC__stream_decoder_get_state(const FLAC__StreamDecoder * decoder)850 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
851 {
852 FLAC__ASSERT(0 != decoder);
853 FLAC__ASSERT(0 != decoder->protected_);
854 return decoder->protected_->state;
855 }
856
FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder * decoder)857 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
858 {
859 return FLAC__StreamDecoderStateString[decoder->protected_->state];
860 }
861
FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder * decoder)862 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
863 {
864 FLAC__ASSERT(0 != decoder);
865 FLAC__ASSERT(0 != decoder->protected_);
866 return decoder->protected_->md5_checking;
867 }
868
FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder * decoder)869 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
870 {
871 FLAC__ASSERT(0 != decoder);
872 FLAC__ASSERT(0 != decoder->protected_);
873 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
874 }
875
FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder * decoder)876 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
877 {
878 FLAC__ASSERT(0 != decoder);
879 FLAC__ASSERT(0 != decoder->protected_);
880 return decoder->protected_->channels;
881 }
882
FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder * decoder)883 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
884 {
885 FLAC__ASSERT(0 != decoder);
886 FLAC__ASSERT(0 != decoder->protected_);
887 return decoder->protected_->channel_assignment;
888 }
889
FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder * decoder)890 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
891 {
892 FLAC__ASSERT(0 != decoder);
893 FLAC__ASSERT(0 != decoder->protected_);
894 return decoder->protected_->bits_per_sample;
895 }
896
FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder * decoder)897 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
898 {
899 FLAC__ASSERT(0 != decoder);
900 FLAC__ASSERT(0 != decoder->protected_);
901 return decoder->protected_->sample_rate;
902 }
903
FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder * decoder)904 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
905 {
906 FLAC__ASSERT(0 != decoder);
907 FLAC__ASSERT(0 != decoder->protected_);
908 return decoder->protected_->blocksize;
909 }
910
FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder * decoder,FLAC__uint64 * position)911 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
912 {
913 FLAC__ASSERT(0 != decoder);
914 FLAC__ASSERT(0 != decoder->private_);
915 FLAC__ASSERT(0 != position);
916
917 #if FLAC__HAS_OGG
918 if(decoder->private_->is_ogg)
919 return false;
920 #endif
921 if(0 == decoder->private_->tell_callback)
922 return false;
923 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
924 return false;
925 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
926 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
927 return false;
928 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
929 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
930 return true;
931 }
932
FLAC__stream_decoder_flush(FLAC__StreamDecoder * decoder)933 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
934 {
935 FLAC__ASSERT(0 != decoder);
936 FLAC__ASSERT(0 != decoder->private_);
937 FLAC__ASSERT(0 != decoder->protected_);
938
939 decoder->private_->samples_decoded = 0;
940 decoder->private_->do_md5_checking = false;
941
942 #if FLAC__HAS_OGG
943 if(decoder->private_->is_ogg)
944 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
945 #endif
946
947 if(!FLAC__bitreader_clear(decoder->private_->input)) {
948 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
949 return false;
950 }
951 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
952
953 return true;
954 }
955
FLAC__stream_decoder_reset(FLAC__StreamDecoder * decoder)956 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
957 {
958 FLAC__ASSERT(0 != decoder);
959 FLAC__ASSERT(0 != decoder->private_);
960 FLAC__ASSERT(0 != decoder->protected_);
961
962 if(!FLAC__stream_decoder_flush(decoder)) {
963 /* above call sets the state for us */
964 return false;
965 }
966
967 #if FLAC__HAS_OGG
968 /*@@@ could go in !internal_reset_hack block below */
969 if(decoder->private_->is_ogg)
970 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
971 #endif
972
973 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
974 * (internal_reset_hack) don't try to rewind since we are already at
975 * the beginning of the stream and don't want to fail if the input is
976 * not seekable.
977 */
978 if(!decoder->private_->internal_reset_hack) {
979 if(decoder->private_->file == stdin)
980 return false; /* can't rewind stdin, reset fails */
981 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
982 return false; /* seekable and seek fails, reset fails */
983 }
984 else
985 decoder->private_->internal_reset_hack = false;
986
987 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
988
989 decoder->private_->has_stream_info = false;
990 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
991 free(decoder->private_->seek_table.data.seek_table.points);
992 decoder->private_->seek_table.data.seek_table.points = 0;
993 decoder->private_->has_seek_table = false;
994 }
995 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
996 /*
997 * This goes in reset() and not flush() because according to the spec, a
998 * fixed-blocksize stream must stay that way through the whole stream.
999 */
1000 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
1001
1002 /* We initialize the FLAC__MD5Context even though we may never use it. This
1003 * is because md5 checking may be turned on to start and then turned off if
1004 * a seek occurs. So we init the context here and finalize it in
1005 * FLAC__stream_decoder_finish() to make sure things are always cleaned up
1006 * properly.
1007 */
1008 FLAC__MD5Init(&decoder->private_->md5context);
1009
1010 decoder->private_->first_frame_offset = 0;
1011 decoder->private_->unparseable_frame_count = 0;
1012
1013 return true;
1014 }
1015
FLAC__stream_decoder_process_single(FLAC__StreamDecoder * decoder)1016 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1017 {
1018 FLAC__bool got_a_frame;
1019 FLAC__ASSERT(0 != decoder);
1020 FLAC__ASSERT(0 != decoder->protected_);
1021
1022 while(1) {
1023 switch(decoder->protected_->state) {
1024 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1025 if(!find_metadata_(decoder))
1026 return false; /* above function sets the status for us */
1027 break;
1028 case FLAC__STREAM_DECODER_READ_METADATA:
1029 if(!read_metadata_(decoder))
1030 return false; /* above function sets the status for us */
1031 else
1032 return true;
1033 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1034 if(!frame_sync_(decoder))
1035 return true; /* above function sets the status for us */
1036 break;
1037 case FLAC__STREAM_DECODER_READ_FRAME:
1038 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1039 return false; /* above function sets the status for us */
1040 if(got_a_frame)
1041 return true; /* above function sets the status for us */
1042 break;
1043 case FLAC__STREAM_DECODER_END_OF_STREAM:
1044 case FLAC__STREAM_DECODER_ABORTED:
1045 return true;
1046 default:
1047 FLAC__ASSERT(0);
1048 return false;
1049 }
1050 }
1051 }
1052
FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder * decoder)1053 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1054 {
1055 FLAC__ASSERT(0 != decoder);
1056 FLAC__ASSERT(0 != decoder->protected_);
1057
1058 while(1) {
1059 switch(decoder->protected_->state) {
1060 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1061 if(!find_metadata_(decoder))
1062 return false; /* above function sets the status for us */
1063 break;
1064 case FLAC__STREAM_DECODER_READ_METADATA:
1065 if(!read_metadata_(decoder))
1066 return false; /* above function sets the status for us */
1067 break;
1068 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1069 case FLAC__STREAM_DECODER_READ_FRAME:
1070 case FLAC__STREAM_DECODER_END_OF_STREAM:
1071 case FLAC__STREAM_DECODER_ABORTED:
1072 return true;
1073 default:
1074 FLAC__ASSERT(0);
1075 return false;
1076 }
1077 }
1078 }
1079
FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder * decoder)1080 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1081 {
1082 FLAC__bool dummy;
1083 FLAC__ASSERT(0 != decoder);
1084 FLAC__ASSERT(0 != decoder->protected_);
1085
1086 while(1) {
1087 switch(decoder->protected_->state) {
1088 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1089 if(!find_metadata_(decoder))
1090 return false; /* above function sets the status for us */
1091 break;
1092 case FLAC__STREAM_DECODER_READ_METADATA:
1093 if(!read_metadata_(decoder))
1094 return false; /* above function sets the status for us */
1095 break;
1096 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1097 if(!frame_sync_(decoder))
1098 return true; /* above function sets the status for us */
1099 break;
1100 case FLAC__STREAM_DECODER_READ_FRAME:
1101 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1102 return false; /* above function sets the status for us */
1103 break;
1104 case FLAC__STREAM_DECODER_END_OF_STREAM:
1105 case FLAC__STREAM_DECODER_ABORTED:
1106 return true;
1107 default:
1108 FLAC__ASSERT(0);
1109 return false;
1110 }
1111 }
1112 }
1113
FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder * decoder)1114 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1115 {
1116 FLAC__bool got_a_frame;
1117 FLAC__ASSERT(0 != decoder);
1118 FLAC__ASSERT(0 != decoder->protected_);
1119
1120 while(1) {
1121 switch(decoder->protected_->state) {
1122 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1123 case FLAC__STREAM_DECODER_READ_METADATA:
1124 return false; /* above function sets the status for us */
1125 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1126 if(!frame_sync_(decoder))
1127 return true; /* above function sets the status for us */
1128 break;
1129 case FLAC__STREAM_DECODER_READ_FRAME:
1130 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1131 return false; /* above function sets the status for us */
1132 if(got_a_frame)
1133 return true; /* above function sets the status for us */
1134 break;
1135 case FLAC__STREAM_DECODER_END_OF_STREAM:
1136 case FLAC__STREAM_DECODER_ABORTED:
1137 return true;
1138 default:
1139 FLAC__ASSERT(0);
1140 return false;
1141 }
1142 }
1143 }
1144
FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder * decoder,FLAC__uint64 sample)1145 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1146 {
1147 FLAC__uint64 length;
1148
1149 FLAC__ASSERT(0 != decoder);
1150
1151 if(
1152 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1153 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1154 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1155 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1156 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1157 )
1158 return false;
1159
1160 if(0 == decoder->private_->seek_callback)
1161 return false;
1162
1163 FLAC__ASSERT(decoder->private_->seek_callback);
1164 FLAC__ASSERT(decoder->private_->tell_callback);
1165 FLAC__ASSERT(decoder->private_->length_callback);
1166 FLAC__ASSERT(decoder->private_->eof_callback);
1167
1168 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1169 return false;
1170
1171 decoder->private_->is_seeking = true;
1172
1173 /* turn off md5 checking if a seek is attempted */
1174 decoder->private_->do_md5_checking = false;
1175
1176 /* 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) */
1177 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1178 decoder->private_->is_seeking = false;
1179 return false;
1180 }
1181
1182 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1183 if(
1184 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1185 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1186 ) {
1187 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1188 /* above call sets the state for us */
1189 decoder->private_->is_seeking = false;
1190 return false;
1191 }
1192 /* check this again in case we didn't know total_samples the first time */
1193 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1194 decoder->private_->is_seeking = false;
1195 return false;
1196 }
1197 }
1198
1199 {
1200 const FLAC__bool ok =
1201 #if FLAC__HAS_OGG
1202 decoder->private_->is_ogg?
1203 seek_to_absolute_sample_ogg_(decoder, length, sample) :
1204 #endif
1205 seek_to_absolute_sample_(decoder, length, sample)
1206 ;
1207 decoder->private_->is_seeking = false;
1208 return ok;
1209 }
1210 }
1211
1212 /***********************************************************************
1213 *
1214 * Protected class methods
1215 *
1216 ***********************************************************************/
1217
FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder * decoder)1218 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1219 {
1220 FLAC__ASSERT(0 != decoder);
1221 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1222 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1223 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1224 }
1225
1226 /***********************************************************************
1227 *
1228 * Private class methods
1229 *
1230 ***********************************************************************/
1231
set_defaults_(FLAC__StreamDecoder * decoder)1232 void set_defaults_(FLAC__StreamDecoder *decoder)
1233 {
1234 #if FLAC__HAS_OGG
1235 decoder->private_->is_ogg = false;
1236 #endif
1237 decoder->private_->read_callback = 0;
1238 decoder->private_->seek_callback = 0;
1239 decoder->private_->tell_callback = 0;
1240 decoder->private_->length_callback = 0;
1241 decoder->private_->eof_callback = 0;
1242 decoder->private_->write_callback = 0;
1243 decoder->private_->metadata_callback = 0;
1244 decoder->private_->error_callback = 0;
1245 decoder->private_->client_data = 0;
1246
1247 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1248 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1249 decoder->private_->metadata_filter_ids_count = 0;
1250
1251 decoder->protected_->md5_checking = false;
1252
1253 #if FLAC__HAS_OGG
1254 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1255 #endif
1256 }
1257
1258 /*
1259 * This will forcibly set stdin to binary mode (for OSes that require it)
1260 */
get_binary_stdin_(void)1261 FILE *get_binary_stdin_(void)
1262 {
1263 /* if something breaks here it is probably due to the presence or
1264 * absence of an underscore before the identifiers 'setmode',
1265 * 'fileno', and/or 'O_BINARY'; check your system header files.
1266 */
1267 #if defined _MSC_VER || defined __MINGW32__
1268 _setmode(_fileno(stdin), _O_BINARY);
1269 #elif defined __CYGWIN__
1270 /* almost certainly not needed for any modern Cygwin, but let's be safe... */
1271 setmode(_fileno(stdin), _O_BINARY);
1272 #elif defined __EMX__
1273 setmode(fileno(stdin), O_BINARY);
1274 #endif
1275
1276 return stdin;
1277 }
1278
allocate_output_(FLAC__StreamDecoder * decoder,unsigned size,unsigned channels)1279 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
1280 {
1281 unsigned i;
1282 FLAC__int32 *tmp;
1283
1284 /* Make sure size is some sensible minimum value. Plumb through predictor_order maybe? */
1285 size = size < FLAC__MAX_LPC_ORDER ? FLAC__MAX_LPC_ORDER : size ;
1286
1287 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1288 return true;
1289
1290 /* simply using realloc() is not practical because the number of channels may change mid-stream */
1291
1292 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1293 if(0 != decoder->private_->output[i]) {
1294 free(decoder->private_->output[i]-4);
1295 decoder->private_->output[i] = 0;
1296 }
1297 if(0 != decoder->private_->residual_unaligned[i]) {
1298 free(decoder->private_->residual_unaligned[i]);
1299 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1300 }
1301 }
1302
1303 for(i = 0; i < channels; i++) {
1304 /* WATCHOUT:
1305 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
1306 * output arrays have a buffer of up to 3 zeroes in front
1307 * (at negative indices) for alignment purposes; we use 4
1308 * to keep the data well-aligned.
1309 */
1310 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1311 if(tmp == 0) {
1312 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1313 return false;
1314 }
1315 memset(tmp, 0, sizeof(FLAC__int32)*4);
1316 decoder->private_->output[i] = tmp + 4;
1317
1318 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1319 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1320 return false;
1321 }
1322 }
1323
1324 decoder->private_->output_capacity = size;
1325 decoder->private_->output_channels = channels;
1326
1327 return true;
1328 }
1329
has_id_filtered_(FLAC__StreamDecoder * decoder,FLAC__byte * id)1330 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1331 {
1332 size_t i;
1333
1334 FLAC__ASSERT(0 != decoder);
1335 FLAC__ASSERT(0 != decoder->private_);
1336
1337 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1338 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1339 return true;
1340
1341 return false;
1342 }
1343
find_metadata_(FLAC__StreamDecoder * decoder)1344 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1345 {
1346 FLAC__uint32 x;
1347 unsigned i, id;
1348 FLAC__bool first = true;
1349
1350 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1351
1352 for(i = id = 0; i < 4; ) {
1353 if(decoder->private_->cached) {
1354 x = (FLAC__uint32)decoder->private_->lookahead;
1355 decoder->private_->cached = false;
1356 }
1357 else {
1358 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1359 return false; /* read_callback_ sets the state for us */
1360 }
1361 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1362 first = true;
1363 i++;
1364 id = 0;
1365 continue;
1366 }
1367
1368 if(id >= 3)
1369 return false;
1370
1371 if(x == ID3V2_TAG_[id]) {
1372 id++;
1373 i = 0;
1374 if(id == 3) {
1375 if(!skip_id3v2_tag_(decoder))
1376 return false; /* skip_id3v2_tag_ sets the state for us */
1377 }
1378 continue;
1379 }
1380 id = 0;
1381 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1382 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1383 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1384 return false; /* read_callback_ sets the state for us */
1385
1386 /* 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 */
1387 /* else we have to check if the second byte is the end of a sync code */
1388 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1389 decoder->private_->lookahead = (FLAC__byte)x;
1390 decoder->private_->cached = true;
1391 }
1392 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
1393 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1394 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1395 return true;
1396 }
1397 }
1398 i = 0;
1399 if(first) {
1400 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1401 first = false;
1402 }
1403 }
1404
1405 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1406 return true;
1407 }
1408
read_metadata_(FLAC__StreamDecoder * decoder)1409 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1410 {
1411 FLAC__bool is_last;
1412 FLAC__uint32 i, x, type, length;
1413
1414 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1415
1416 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1417 return false; /* read_callback_ sets the state for us */
1418 is_last = x? true : false;
1419
1420 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1421 return false; /* read_callback_ sets the state for us */
1422
1423 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1424 return false; /* read_callback_ sets the state for us */
1425
1426 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1427 if(!read_metadata_streaminfo_(decoder, is_last, length))
1428 return false;
1429
1430 decoder->private_->has_stream_info = true;
1431 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))
1432 decoder->private_->do_md5_checking = false;
1433 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1434 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1435 }
1436 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1437 if(!read_metadata_seektable_(decoder, is_last, length))
1438 return false;
1439
1440 decoder->private_->has_seek_table = true;
1441 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1442 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1443 }
1444 else {
1445 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1446 unsigned real_length = length;
1447 FLAC__StreamMetadata block;
1448
1449 memset(&block, 0, sizeof(block));
1450 block.is_last = is_last;
1451 block.type = (FLAC__MetadataType)type;
1452 block.length = length;
1453
1454 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1455 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1456 return false; /* read_callback_ sets the state for us */
1457
1458 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1459 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1460 return false;
1461 }
1462
1463 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1464
1465 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1466 skip_it = !skip_it;
1467 }
1468
1469 if(skip_it) {
1470 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1471 return false; /* read_callback_ sets the state for us */
1472 }
1473 else {
1474 FLAC__bool ok = true;
1475 switch(type) {
1476 case FLAC__METADATA_TYPE_PADDING:
1477 /* skip the padding bytes */
1478 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1479 ok = false; /* read_callback_ sets the state for us */
1480 break;
1481 case FLAC__METADATA_TYPE_APPLICATION:
1482 /* remember, we read the ID already */
1483 if(real_length > 0) {
1484 if(0 == (block.data.application.data = malloc(real_length))) {
1485 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1486 ok = false;
1487 }
1488 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1489 ok = false; /* read_callback_ sets the state for us */
1490 }
1491 else
1492 block.data.application.data = 0;
1493 break;
1494 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1495 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
1496 ok = false;
1497 break;
1498 case FLAC__METADATA_TYPE_CUESHEET:
1499 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1500 ok = false;
1501 break;
1502 case FLAC__METADATA_TYPE_PICTURE:
1503 if(!read_metadata_picture_(decoder, &block.data.picture))
1504 ok = false;
1505 break;
1506 case FLAC__METADATA_TYPE_STREAMINFO:
1507 case FLAC__METADATA_TYPE_SEEKTABLE:
1508 FLAC__ASSERT(0);
1509 break;
1510 default:
1511 if(real_length > 0) {
1512 if(0 == (block.data.unknown.data = malloc(real_length))) {
1513 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1514 ok = false;
1515 }
1516 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1517 ok = false; /* read_callback_ sets the state for us */
1518 }
1519 else
1520 block.data.unknown.data = 0;
1521 break;
1522 }
1523 if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
1524 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1525
1526 /* now we have to free any malloc()ed data in the block */
1527 switch(type) {
1528 case FLAC__METADATA_TYPE_PADDING:
1529 break;
1530 case FLAC__METADATA_TYPE_APPLICATION:
1531 if(0 != block.data.application.data)
1532 free(block.data.application.data);
1533 break;
1534 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1535 if(0 != block.data.vorbis_comment.vendor_string.entry)
1536 free(block.data.vorbis_comment.vendor_string.entry);
1537 if(block.data.vorbis_comment.num_comments > 0)
1538 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1539 if(0 != block.data.vorbis_comment.comments[i].entry)
1540 free(block.data.vorbis_comment.comments[i].entry);
1541 if(0 != block.data.vorbis_comment.comments)
1542 free(block.data.vorbis_comment.comments);
1543 break;
1544 case FLAC__METADATA_TYPE_CUESHEET:
1545 if(block.data.cue_sheet.num_tracks > 0)
1546 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1547 if(0 != block.data.cue_sheet.tracks[i].indices)
1548 free(block.data.cue_sheet.tracks[i].indices);
1549 if(0 != block.data.cue_sheet.tracks)
1550 free(block.data.cue_sheet.tracks);
1551 break;
1552 case FLAC__METADATA_TYPE_PICTURE:
1553 if(0 != block.data.picture.mime_type)
1554 free(block.data.picture.mime_type);
1555 if(0 != block.data.picture.description)
1556 free(block.data.picture.description);
1557 if(0 != block.data.picture.data)
1558 free(block.data.picture.data);
1559 break;
1560 case FLAC__METADATA_TYPE_STREAMINFO:
1561 case FLAC__METADATA_TYPE_SEEKTABLE:
1562 FLAC__ASSERT(0);
1563 default:
1564 if(0 != block.data.unknown.data)
1565 free(block.data.unknown.data);
1566 break;
1567 }
1568
1569 if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
1570 return false;
1571 }
1572 }
1573
1574 if(is_last) {
1575 /* if this fails, it's OK, it's just a hint for the seek routine */
1576 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1577 decoder->private_->first_frame_offset = 0;
1578 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1579 }
1580
1581 return true;
1582 }
1583
read_metadata_streaminfo_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,unsigned length)1584 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1585 {
1586 FLAC__uint32 x;
1587 unsigned bits, used_bits = 0;
1588
1589 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1590
1591 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1592 decoder->private_->stream_info.is_last = is_last;
1593 decoder->private_->stream_info.length = length;
1594
1595 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1596 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1597 return false; /* read_callback_ sets the state for us */
1598 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1599 used_bits += bits;
1600
1601 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1602 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1603 return false; /* read_callback_ sets the state for us */
1604 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1605 used_bits += bits;
1606
1607 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1608 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1609 return false; /* read_callback_ sets the state for us */
1610 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1611 used_bits += bits;
1612
1613 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1614 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1615 return false; /* read_callback_ sets the state for us */
1616 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1617 used_bits += bits;
1618
1619 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1620 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1621 return false; /* read_callback_ sets the state for us */
1622 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1623 used_bits += bits;
1624
1625 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1626 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1627 return false; /* read_callback_ sets the state for us */
1628 decoder->private_->stream_info.data.stream_info.channels = x+1;
1629 used_bits += bits;
1630
1631 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1632 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1633 return false; /* read_callback_ sets the state for us */
1634 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1635 used_bits += bits;
1636
1637 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1638 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))
1639 return false; /* read_callback_ sets the state for us */
1640 used_bits += bits;
1641
1642 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1643 return false; /* read_callback_ sets the state for us */
1644 used_bits += 16*8;
1645
1646 /* skip the rest of the block */
1647 FLAC__ASSERT(used_bits % 8 == 0);
1648 length -= (used_bits / 8);
1649 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1650 return false; /* read_callback_ sets the state for us */
1651
1652 return true;
1653 }
1654
read_metadata_seektable_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,unsigned length)1655 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1656 {
1657 FLAC__uint32 i, x;
1658 FLAC__uint64 xx;
1659
1660 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1661
1662 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1663 decoder->private_->seek_table.is_last = is_last;
1664 decoder->private_->seek_table.length = length;
1665
1666 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1667
1668 /* use realloc since we may pass through here several times (e.g. after seeking) */
1669 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)))) {
1670 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1671 return false;
1672 }
1673 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1674 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1675 return false; /* read_callback_ sets the state for us */
1676 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1677
1678 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1679 return false; /* read_callback_ sets the state for us */
1680 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1681
1682 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1683 return false; /* read_callback_ sets the state for us */
1684 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1685 }
1686 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1687 /* if there is a partial point left, skip over it */
1688 if(length > 0) {
1689 /*@@@ do a send_error_to_client_() here? there's an argument for either way */
1690 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1691 return false; /* read_callback_ sets the state for us */
1692 }
1693
1694 return true;
1695 }
1696
read_metadata_vorbiscomment_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_VorbisComment * obj,unsigned length)1697 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, unsigned length)
1698 {
1699 FLAC__uint32 i;
1700
1701 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1702
1703 /* read vendor string */
1704 if (length >= 8) {
1705 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
1706 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1707 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1708 return false; /* read_callback_ sets the state for us */
1709 if (obj->vendor_string.length > 0) {
1710 if (length < obj->vendor_string.length) {
1711 obj->vendor_string.length = 0;
1712 obj->vendor_string.entry = 0;
1713 goto skip;
1714 }
1715 else
1716 length -= obj->vendor_string.length;
1717 if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1718 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1719 return false;
1720 }
1721 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1722 return false; /* read_callback_ sets the state for us */
1723 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1724 }
1725 else
1726 obj->vendor_string.entry = 0;
1727
1728 /* read num comments */
1729 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1730 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1731 return false; /* read_callback_ sets the state for us */
1732
1733 /* read comments */
1734 if (obj->num_comments > 100000) {
1735 /* Possibly malicious file. */
1736 obj->num_comments = 0;
1737 return false;
1738 }
1739 if (obj->num_comments > 0) {
1740 if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1741 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1742 return false;
1743 }
1744 for (i = 0; i < obj->num_comments; i++) {
1745 /* Initialize here just to make sure. */
1746 obj->comments[i].length = 0;
1747 obj->comments[i].entry = 0;
1748
1749 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1750 if (length < 4) {
1751 obj->num_comments = i;
1752 goto skip;
1753 }
1754 else
1755 length -= 4;
1756 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length))
1757 return false; /* read_callback_ sets the state for us */
1758 if (obj->comments[i].length > 0) {
1759 if (length < obj->comments[i].length) {
1760 obj->num_comments = i;
1761 goto skip;
1762 }
1763 else
1764 length -= obj->comments[i].length;
1765 if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1766 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1767 return false;
1768 }
1769 memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
1770 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
1771 obj->num_comments = i;
1772 goto skip;
1773 }
1774 obj->comments[i].entry[obj->comments[i].length] = '\0';
1775 }
1776 else
1777 obj->comments[i].entry = 0;
1778 }
1779 }
1780 else
1781 obj->comments = 0;
1782 }
1783
1784 skip:
1785 if (length > 0) {
1786 /* This will only happen on files with invalid data in comments */
1787 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1788 return false; /* read_callback_ sets the state for us */
1789 }
1790
1791 return true;
1792 }
1793
read_metadata_cuesheet_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_CueSheet * obj)1794 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1795 {
1796 FLAC__uint32 i, j, x;
1797
1798 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1799
1800 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1801
1802 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1803 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))
1804 return false; /* read_callback_ sets the state for us */
1805
1806 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1807 return false; /* read_callback_ sets the state for us */
1808
1809 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1810 return false; /* read_callback_ sets the state for us */
1811 obj->is_cd = x? true : false;
1812
1813 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1814 return false; /* read_callback_ sets the state for us */
1815
1816 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1817 return false; /* read_callback_ sets the state for us */
1818 obj->num_tracks = x;
1819
1820 if(obj->num_tracks > 0) {
1821 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1822 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1823 return false;
1824 }
1825 for(i = 0; i < obj->num_tracks; i++) {
1826 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1827 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1828 return false; /* read_callback_ sets the state for us */
1829
1830 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1831 return false; /* read_callback_ sets the state for us */
1832 track->number = (FLAC__byte)x;
1833
1834 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1835 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1836 return false; /* read_callback_ sets the state for us */
1837
1838 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1839 return false; /* read_callback_ sets the state for us */
1840 track->type = x;
1841
1842 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1843 return false; /* read_callback_ sets the state for us */
1844 track->pre_emphasis = x;
1845
1846 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1847 return false; /* read_callback_ sets the state for us */
1848
1849 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1850 return false; /* read_callback_ sets the state for us */
1851 track->num_indices = (FLAC__byte)x;
1852
1853 if(track->num_indices > 0) {
1854 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1855 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1856 return false;
1857 }
1858 for(j = 0; j < track->num_indices; j++) {
1859 FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
1860 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1861 return false; /* read_callback_ sets the state for us */
1862
1863 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1864 return false; /* read_callback_ sets the state for us */
1865 indx->number = (FLAC__byte)x;
1866
1867 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1868 return false; /* read_callback_ sets the state for us */
1869 }
1870 }
1871 }
1872 }
1873
1874 return true;
1875 }
1876
read_metadata_picture_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_Picture * obj)1877 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1878 {
1879 FLAC__uint32 x;
1880
1881 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1882
1883 /* read type */
1884 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1885 return false; /* read_callback_ sets the state for us */
1886 obj->type = x;
1887
1888 /* read MIME type */
1889 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1890 return false; /* read_callback_ sets the state for us */
1891 if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
1892 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1893 return false;
1894 }
1895 if(x > 0) {
1896 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1897 return false; /* read_callback_ sets the state for us */
1898 }
1899 obj->mime_type[x] = '\0';
1900
1901 /* read description */
1902 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1903 return false; /* read_callback_ sets the state for us */
1904 if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
1905 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1906 return false;
1907 }
1908 if(x > 0) {
1909 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1910 return false; /* read_callback_ sets the state for us */
1911 }
1912 obj->description[x] = '\0';
1913
1914 /* read width */
1915 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1916 return false; /* read_callback_ sets the state for us */
1917
1918 /* read height */
1919 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1920 return false; /* read_callback_ sets the state for us */
1921
1922 /* read depth */
1923 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1924 return false; /* read_callback_ sets the state for us */
1925
1926 /* read colors */
1927 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1928 return false; /* read_callback_ sets the state for us */
1929
1930 /* read data */
1931 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1932 return false; /* read_callback_ sets the state for us */
1933 if(0 == (obj->data = safe_malloc_(obj->data_length))) {
1934 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1935 return false;
1936 }
1937 if(obj->data_length > 0) {
1938 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1939 return false; /* read_callback_ sets the state for us */
1940 }
1941
1942 return true;
1943 }
1944
skip_id3v2_tag_(FLAC__StreamDecoder * decoder)1945 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1946 {
1947 FLAC__uint32 x;
1948 unsigned i, skip;
1949
1950 /* skip the version and flags bytes */
1951 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1952 return false; /* read_callback_ sets the state for us */
1953 /* get the size (in bytes) to skip */
1954 skip = 0;
1955 for(i = 0; i < 4; i++) {
1956 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1957 return false; /* read_callback_ sets the state for us */
1958 skip <<= 7;
1959 skip |= (x & 0x7f);
1960 }
1961 /* skip the rest of the tag */
1962 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1963 return false; /* read_callback_ sets the state for us */
1964 return true;
1965 }
1966
frame_sync_(FLAC__StreamDecoder * decoder)1967 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1968 {
1969 FLAC__uint32 x;
1970 FLAC__bool first = true;
1971
1972 /* If we know the total number of samples in the stream, stop if we've read that many. */
1973 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1974 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1975 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1976 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1977 return true;
1978 }
1979 }
1980
1981 /* make sure we're byte aligned */
1982 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1983 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1984 return false; /* read_callback_ sets the state for us */
1985 }
1986
1987 while(1) {
1988 if(decoder->private_->cached) {
1989 x = (FLAC__uint32)decoder->private_->lookahead;
1990 decoder->private_->cached = false;
1991 }
1992 else {
1993 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1994 return false; /* read_callback_ sets the state for us */
1995 }
1996 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1997 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1998 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1999 return false; /* read_callback_ sets the state for us */
2000
2001 /* 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 */
2002 /* else we have to check if the second byte is the end of a sync code */
2003 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2004 decoder->private_->lookahead = (FLAC__byte)x;
2005 decoder->private_->cached = true;
2006 }
2007 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
2008 decoder->private_->header_warmup[1] = (FLAC__byte)x;
2009 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
2010 return true;
2011 }
2012 }
2013 if(first) {
2014 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2015 first = false;
2016 }
2017 }
2018
2019 return true;
2020 }
2021
read_frame_(FLAC__StreamDecoder * decoder,FLAC__bool * got_a_frame,FLAC__bool do_full_decode)2022 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2023 {
2024 unsigned channel;
2025 unsigned i;
2026 FLAC__int32 mid, side;
2027 unsigned frame_crc; /* the one we calculate from the input stream */
2028 FLAC__uint32 x;
2029
2030 *got_a_frame = false;
2031
2032 /* init the CRC */
2033 frame_crc = 0;
2034 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2035 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2036 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2037
2038 if(!read_frame_header_(decoder))
2039 return false;
2040 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2041 return true;
2042 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2043 return false;
2044 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2045 /*
2046 * first figure the correct bits-per-sample of the subframe
2047 */
2048 unsigned bps = decoder->private_->frame.header.bits_per_sample;
2049 switch(decoder->private_->frame.header.channel_assignment) {
2050 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2051 /* no adjustment needed */
2052 break;
2053 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2054 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2055 if(channel == 1)
2056 bps++;
2057 break;
2058 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2059 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2060 if(channel == 0)
2061 bps++;
2062 break;
2063 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2064 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2065 if(channel == 1)
2066 bps++;
2067 break;
2068 default:
2069 FLAC__ASSERT(0);
2070 }
2071 /*
2072 * now read it
2073 */
2074 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2075 return false;
2076 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2077 return true;
2078 }
2079 if(!read_zero_padding_(decoder))
2080 return false;
2081 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) */
2082 return true;
2083
2084 /*
2085 * Read the frame CRC-16 from the footer and check
2086 */
2087 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2088 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2089 return false; /* read_callback_ sets the state for us */
2090 if(frame_crc == x) {
2091 if(do_full_decode) {
2092 /* Undo any special channel coding */
2093 switch(decoder->private_->frame.header.channel_assignment) {
2094 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2095 /* do nothing */
2096 break;
2097 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2098 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2099 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2100 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2101 break;
2102 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2103 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2104 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2105 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2106 break;
2107 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2108 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2109 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2110 #if 1
2111 mid = decoder->private_->output[0][i];
2112 side = decoder->private_->output[1][i];
2113 mid <<= 1;
2114 mid |= (side & 1); /* i.e. if 'side' is odd... */
2115 decoder->private_->output[0][i] = (mid + side) >> 1;
2116 decoder->private_->output[1][i] = (mid - side) >> 1;
2117 #else
2118 /* OPT: without 'side' temp variable */
2119 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2120 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2121 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2122 #endif
2123 }
2124 break;
2125 default:
2126 FLAC__ASSERT(0);
2127 break;
2128 }
2129 }
2130 }
2131 else {
2132 /* Bad frame, emit error and zero the output signal */
2133 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2134 if(do_full_decode) {
2135 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2136 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2137 }
2138 }
2139 }
2140
2141 *got_a_frame = true;
2142
2143 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2144 if(decoder->private_->next_fixed_block_size)
2145 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2146
2147 /* put the latest values into the public section of the decoder instance */
2148 decoder->protected_->channels = decoder->private_->frame.header.channels;
2149 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2150 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2151 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2152 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2153
2154 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2155 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2156
2157 /* write it */
2158 if(do_full_decode) {
2159 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
2160 return false;
2161 }
2162
2163 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2164 return true;
2165 }
2166
read_frame_header_(FLAC__StreamDecoder * decoder)2167 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2168 {
2169 FLAC__uint32 x;
2170 FLAC__uint64 xx;
2171 unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
2172 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2173 unsigned raw_header_len;
2174 FLAC__bool is_unparseable = false;
2175
2176 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2177
2178 /* init the raw header with the saved bits from synchronization */
2179 raw_header[0] = decoder->private_->header_warmup[0];
2180 raw_header[1] = decoder->private_->header_warmup[1];
2181 raw_header_len = 2;
2182
2183 /* check to make sure that reserved bit is 0 */
2184 if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2185 is_unparseable = true;
2186
2187 /*
2188 * Note that along the way as we read the header, we look for a sync
2189 * code inside. If we find one it would indicate that our original
2190 * sync was bad since there cannot be a sync code in a valid header.
2191 *
2192 * Three kinds of things can go wrong when reading the frame header:
2193 * 1) We may have sync'ed incorrectly and not landed on a frame header.
2194 * If we don't find a sync code, it can end up looking like we read
2195 * a valid but unparseable header, until getting to the frame header
2196 * CRC. Even then we could get a false positive on the CRC.
2197 * 2) We may have sync'ed correctly but on an unparseable frame (from a
2198 * future encoder).
2199 * 3) We may be on a damaged frame which appears valid but unparseable.
2200 *
2201 * For all these reasons, we try and read a complete frame header as
2202 * long as it seems valid, even if unparseable, up until the frame
2203 * header CRC.
2204 */
2205
2206 /*
2207 * read in the raw header as bytes so we can CRC it, and parse it on the way
2208 */
2209 for(i = 0; i < 2; i++) {
2210 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2211 return false; /* read_callback_ sets the state for us */
2212 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2213 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2214 decoder->private_->lookahead = (FLAC__byte)x;
2215 decoder->private_->cached = true;
2216 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2217 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2218 return true;
2219 }
2220 raw_header[raw_header_len++] = (FLAC__byte)x;
2221 }
2222
2223 switch(x = raw_header[2] >> 4) {
2224 case 0:
2225 is_unparseable = true;
2226 break;
2227 case 1:
2228 decoder->private_->frame.header.blocksize = 192;
2229 break;
2230 case 2:
2231 case 3:
2232 case 4:
2233 case 5:
2234 decoder->private_->frame.header.blocksize = 576 << (x-2);
2235 break;
2236 case 6:
2237 case 7:
2238 blocksize_hint = x;
2239 break;
2240 case 8:
2241 case 9:
2242 case 10:
2243 case 11:
2244 case 12:
2245 case 13:
2246 case 14:
2247 case 15:
2248 decoder->private_->frame.header.blocksize = 256 << (x-8);
2249 break;
2250 default:
2251 FLAC__ASSERT(0);
2252 break;
2253 }
2254
2255 switch(x = raw_header[2] & 0x0f) {
2256 case 0:
2257 if(decoder->private_->has_stream_info)
2258 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2259 else
2260 is_unparseable = true;
2261 break;
2262 case 1:
2263 decoder->private_->frame.header.sample_rate = 88200;
2264 break;
2265 case 2:
2266 decoder->private_->frame.header.sample_rate = 176400;
2267 break;
2268 case 3:
2269 decoder->private_->frame.header.sample_rate = 192000;
2270 break;
2271 case 4:
2272 decoder->private_->frame.header.sample_rate = 8000;
2273 break;
2274 case 5:
2275 decoder->private_->frame.header.sample_rate = 16000;
2276 break;
2277 case 6:
2278 decoder->private_->frame.header.sample_rate = 22050;
2279 break;
2280 case 7:
2281 decoder->private_->frame.header.sample_rate = 24000;
2282 break;
2283 case 8:
2284 decoder->private_->frame.header.sample_rate = 32000;
2285 break;
2286 case 9:
2287 decoder->private_->frame.header.sample_rate = 44100;
2288 break;
2289 case 10:
2290 decoder->private_->frame.header.sample_rate = 48000;
2291 break;
2292 case 11:
2293 decoder->private_->frame.header.sample_rate = 96000;
2294 break;
2295 case 12:
2296 case 13:
2297 case 14:
2298 sample_rate_hint = x;
2299 break;
2300 case 15:
2301 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2302 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2303 return true;
2304 default:
2305 FLAC__ASSERT(0);
2306 }
2307
2308 x = (unsigned)(raw_header[3] >> 4);
2309 if(x & 8) {
2310 decoder->private_->frame.header.channels = 2;
2311 switch(x & 7) {
2312 case 0:
2313 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2314 break;
2315 case 1:
2316 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2317 break;
2318 case 2:
2319 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2320 break;
2321 default:
2322 is_unparseable = true;
2323 break;
2324 }
2325 }
2326 else {
2327 decoder->private_->frame.header.channels = (unsigned)x + 1;
2328 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2329 }
2330
2331 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
2332 case 0:
2333 if(decoder->private_->has_stream_info)
2334 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2335 else
2336 is_unparseable = true;
2337 break;
2338 case 1:
2339 decoder->private_->frame.header.bits_per_sample = 8;
2340 break;
2341 case 2:
2342 decoder->private_->frame.header.bits_per_sample = 12;
2343 break;
2344 case 4:
2345 decoder->private_->frame.header.bits_per_sample = 16;
2346 break;
2347 case 5:
2348 decoder->private_->frame.header.bits_per_sample = 20;
2349 break;
2350 case 6:
2351 decoder->private_->frame.header.bits_per_sample = 24;
2352 break;
2353 case 3:
2354 case 7:
2355 is_unparseable = true;
2356 break;
2357 default:
2358 FLAC__ASSERT(0);
2359 break;
2360 }
2361
2362 /* check to make sure that reserved bit is 0 */
2363 if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2364 is_unparseable = true;
2365
2366 /* read the frame's starting sample number (or frame number as the case may be) */
2367 if(
2368 raw_header[1] & 0x01 ||
2369 /*@@@ 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 */
2370 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2371 ) { /* variable blocksize */
2372 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2373 return false; /* read_callback_ sets the state for us */
2374 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2375 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2376 decoder->private_->cached = true;
2377 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2378 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2379 return true;
2380 }
2381 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2382 decoder->private_->frame.header.number.sample_number = xx;
2383 }
2384 else { /* fixed blocksize */
2385 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2386 return false; /* read_callback_ sets the state for us */
2387 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2388 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2389 decoder->private_->cached = true;
2390 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2391 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2392 return true;
2393 }
2394 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2395 decoder->private_->frame.header.number.frame_number = x;
2396 }
2397
2398 if(blocksize_hint) {
2399 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2400 return false; /* read_callback_ sets the state for us */
2401 raw_header[raw_header_len++] = (FLAC__byte)x;
2402 if(blocksize_hint == 7) {
2403 FLAC__uint32 _x;
2404 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2405 return false; /* read_callback_ sets the state for us */
2406 raw_header[raw_header_len++] = (FLAC__byte)_x;
2407 x = (x << 8) | _x;
2408 }
2409 decoder->private_->frame.header.blocksize = x+1;
2410 }
2411
2412 if(sample_rate_hint) {
2413 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2414 return false; /* read_callback_ sets the state for us */
2415 raw_header[raw_header_len++] = (FLAC__byte)x;
2416 if(sample_rate_hint != 12) {
2417 FLAC__uint32 _x;
2418 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2419 return false; /* read_callback_ sets the state for us */
2420 raw_header[raw_header_len++] = (FLAC__byte)_x;
2421 x = (x << 8) | _x;
2422 }
2423 if(sample_rate_hint == 12)
2424 decoder->private_->frame.header.sample_rate = x*1000;
2425 else if(sample_rate_hint == 13)
2426 decoder->private_->frame.header.sample_rate = x;
2427 else
2428 decoder->private_->frame.header.sample_rate = x*10;
2429 }
2430
2431 /* read the CRC-8 byte */
2432 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2433 return false; /* read_callback_ sets the state for us */
2434 crc8 = (FLAC__byte)x;
2435
2436 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2437 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2438 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2439 return true;
2440 }
2441
2442 /* calculate the sample number from the frame number if needed */
2443 decoder->private_->next_fixed_block_size = 0;
2444 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2445 x = decoder->private_->frame.header.number.frame_number;
2446 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2447 if(decoder->private_->fixed_block_size)
2448 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2449 else if(decoder->private_->has_stream_info) {
2450 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2451 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2452 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2453 }
2454 else
2455 is_unparseable = true;
2456 }
2457 else if(x == 0) {
2458 decoder->private_->frame.header.number.sample_number = 0;
2459 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2460 }
2461 else {
2462 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2463 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2464 }
2465 }
2466
2467 if(is_unparseable) {
2468 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2469 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2470 return true;
2471 }
2472
2473 return true;
2474 }
2475
read_subframe_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2476 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2477 {
2478 FLAC__uint32 x;
2479 FLAC__bool wasted_bits;
2480 unsigned i;
2481
2482 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2483 return false; /* read_callback_ sets the state for us */
2484
2485 wasted_bits = (x & 1);
2486 x &= 0xfe;
2487
2488 if(wasted_bits) {
2489 unsigned u;
2490 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2491 return false; /* read_callback_ sets the state for us */
2492 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2493 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2494 }
2495 else
2496 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2497
2498 /*
2499 * Lots of magic numbers here
2500 */
2501 if(x & 0x80) {
2502 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2503 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2504 return true;
2505 }
2506 else if(x == 0) {
2507 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2508 return false;
2509 }
2510 else if(x == 2) {
2511 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2512 return false;
2513 }
2514 else if(x < 16) {
2515 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2516 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2517 return true;
2518 }
2519 else if(x <= 24) {
2520 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2521 return false;
2522 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2523 return true;
2524 }
2525 else if(x < 64) {
2526 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2527 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2528 return true;
2529 }
2530 else {
2531 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2532 return false;
2533 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2534 return true;
2535 }
2536
2537 if(wasted_bits && do_full_decode) {
2538 x = decoder->private_->frame.subframes[channel].wasted_bits;
2539 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2540 decoder->private_->output[channel][i] <<= x;
2541 }
2542
2543 return true;
2544 }
2545
read_subframe_constant_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2546 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2547 {
2548 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2549 FLAC__int32 x;
2550 unsigned 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,unsigned channel,unsigned bps,const unsigned order,FLAC__bool do_full_decode)2569 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned 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 unsigned 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 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2598 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2599 break;
2600 default:
2601 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2602 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2603 return true;
2604 }
2605
2606 /* read residual */
2607 switch(subframe->entropy_coding_method.type) {
2608 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2609 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2610 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))
2611 return false;
2612 break;
2613 default:
2614 FLAC__ASSERT(0);
2615 }
2616
2617 /* decode the subframe */
2618 if(do_full_decode) {
2619 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2620 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2621 }
2622
2623 return true;
2624 }
2625
read_subframe_lpc_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,const unsigned order,FLAC__bool do_full_decode)2626 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2627 {
2628 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2629 FLAC__int32 i32;
2630 FLAC__uint32 u32;
2631 unsigned u;
2632
2633 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2634
2635 subframe->residual = decoder->private_->residual[channel];
2636 subframe->order = order;
2637
2638 /* read warm-up samples */
2639 for(u = 0; u < order; u++) {
2640 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2641 return false; /* read_callback_ sets the state for us */
2642 subframe->warmup[u] = i32;
2643 }
2644
2645 /* read qlp coeff precision */
2646 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2647 return false; /* read_callback_ sets the state for us */
2648 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2649 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2650 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2651 return true;
2652 }
2653 subframe->qlp_coeff_precision = u32+1;
2654
2655 /* read qlp shift */
2656 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2657 return false; /* read_callback_ sets the state for us */
2658 subframe->quantization_level = i32;
2659
2660 /* read quantized lp coefficiencts */
2661 for(u = 0; u < order; u++) {
2662 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2663 return false; /* read_callback_ sets the state for us */
2664 subframe->qlp_coeff[u] = i32;
2665 }
2666
2667 /* read entropy coding method info */
2668 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2669 return false; /* read_callback_ sets the state for us */
2670 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2671 switch(subframe->entropy_coding_method.type) {
2672 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2673 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2674 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2675 return false; /* read_callback_ sets the state for us */
2676 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2677 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2678 break;
2679 default:
2680 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2681 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2682 return true;
2683 }
2684
2685 /* read residual */
2686 switch(subframe->entropy_coding_method.type) {
2687 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2688 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2689 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))
2690 return false;
2691 break;
2692 default:
2693 FLAC__ASSERT(0);
2694 }
2695
2696 /* decode the subframe */
2697 if(do_full_decode) {
2698 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2699 /*@@@@@@ technically not pessimistic enough, should be more like
2700 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
2701 */
2702 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2703 if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
2704 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);
2705 else
2706 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);
2707 else
2708 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);
2709 }
2710
2711 return true;
2712 }
2713
read_subframe_verbatim_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2714 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2715 {
2716 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2717 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2718 unsigned i;
2719
2720 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2721
2722 subframe->data = residual;
2723
2724 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2725 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2726 return false; /* read_callback_ sets the state for us */
2727 residual[i] = x;
2728 }
2729
2730 /* decode the subframe */
2731 if(do_full_decode)
2732 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2733
2734 return true;
2735 }
2736
read_residual_partitioned_rice_(FLAC__StreamDecoder * decoder,unsigned predictor_order,unsigned partition_order,FLAC__EntropyCodingMethod_PartitionedRiceContents * partitioned_rice_contents,FLAC__int32 * residual,FLAC__bool is_extended)2737 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2738 {
2739 FLAC__uint32 rice_parameter;
2740 int i;
2741 unsigned partition, sample, u;
2742 const unsigned partitions = 1u << partition_order;
2743 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2744 const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2745 const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2746
2747 /* sanity checks */
2748 if(partition_order == 0) {
2749 if(decoder->private_->frame.header.blocksize < predictor_order) {
2750 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2751 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2752 return true;
2753 }
2754 }
2755 else {
2756 if(partition_samples < predictor_order) {
2757 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2758 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2759 return true;
2760 }
2761 }
2762
2763 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
2764 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2765 return false;
2766 }
2767
2768 sample = 0;
2769 for(partition = 0; partition < partitions; partition++) {
2770 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2771 return false; /* read_callback_ sets the state for us */
2772 partitioned_rice_contents->parameters[partition] = rice_parameter;
2773 if(rice_parameter < pesc) {
2774 partitioned_rice_contents->raw_bits[partition] = 0;
2775 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2776 if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2777 return false; /* read_callback_ sets the state for us */
2778 sample += u;
2779 }
2780 else {
2781 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2782 return false; /* read_callback_ sets the state for us */
2783 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2784 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2785 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2786 return false; /* read_callback_ sets the state for us */
2787 residual[sample] = i;
2788 }
2789 }
2790 }
2791
2792 return true;
2793 }
2794
read_zero_padding_(FLAC__StreamDecoder * decoder)2795 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2796 {
2797 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2798 FLAC__uint32 zero = 0;
2799 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2800 return false; /* read_callback_ sets the state for us */
2801 if(zero != 0) {
2802 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2803 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2804 }
2805 }
2806 return true;
2807 }
2808
read_callback_(FLAC__byte buffer[],size_t * bytes,void * client_data)2809 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2810 {
2811 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2812
2813 if(
2814 #if FLAC__HAS_OGG
2815 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2816 !decoder->private_->is_ogg &&
2817 #endif
2818 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2819 ) {
2820 *bytes = 0;
2821 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2822 return false;
2823 }
2824 else if(*bytes > 0) {
2825 /* While seeking, it is possible for our seek to land in the
2826 * middle of audio data that looks exactly like a frame header
2827 * from a future version of an encoder. When that happens, our
2828 * error callback will get an
2829 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2830 * unparseable_frame_count. But there is a remote possibility
2831 * that it is properly synced at such a "future-codec frame",
2832 * so to make sure, we wait to see many "unparseable" errors in
2833 * a row before bailing out.
2834 */
2835 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2836 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2837 return false;
2838 }
2839 else {
2840 const FLAC__StreamDecoderReadStatus status =
2841 #if FLAC__HAS_OGG
2842 decoder->private_->is_ogg?
2843 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2844 #endif
2845 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2846 ;
2847 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2848 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2849 return false;
2850 }
2851 else if(*bytes == 0) {
2852 if(
2853 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2854 (
2855 #if FLAC__HAS_OGG
2856 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2857 !decoder->private_->is_ogg &&
2858 #endif
2859 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2860 )
2861 ) {
2862 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2863 return false;
2864 }
2865 else
2866 return true;
2867 }
2868 else
2869 return true;
2870 }
2871 }
2872 else {
2873 /* abort to avoid a deadlock */
2874 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2875 return false;
2876 }
2877 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2878 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync
2879 * and at the same time hit the end of the stream (for example, seeking
2880 * to a point that is after the beginning of the last Ogg page). There
2881 * is no way to report an Ogg sync loss through the callbacks (see note
2882 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2883 * So to keep the decoder from stopping at this point we gate the call
2884 * to the eof_callback and let the Ogg decoder aspect set the
2885 * end-of-stream state when it is needed.
2886 */
2887 }
2888
2889 #if FLAC__HAS_OGG
read_callback_ogg_aspect_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes)2890 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2891 {
2892 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2893 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2894 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2895 /* we don't really have a way to handle lost sync via read
2896 * callback so we'll let it pass and let the underlying
2897 * FLAC decoder catch the error
2898 */
2899 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2900 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2901 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2902 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2903 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2904 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2905 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2906 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2907 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2908 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2909 default:
2910 FLAC__ASSERT(0);
2911 /* double protection */
2912 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2913 }
2914 }
2915
read_callback_proxy_(const void * void_decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)2916 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2917 {
2918 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2919
2920 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2921 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2922 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2923 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2924 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2925 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2926 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2927 default:
2928 /* double protection: */
2929 FLAC__ASSERT(0);
2930 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2931 }
2932 }
2933 #endif
2934
write_audio_frame_to_client_(FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[])2935 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2936 {
2937 if(decoder->private_->is_seeking) {
2938 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2939 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2940 FLAC__uint64 target_sample = decoder->private_->target_sample;
2941
2942 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2943
2944 #if FLAC__HAS_OGG
2945 decoder->private_->got_a_frame = true;
2946 #endif
2947 decoder->private_->last_frame = *frame; /* save the frame */
2948 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2949 unsigned delta = (unsigned)(target_sample - this_frame_sample);
2950 /* kick out of seek mode */
2951 decoder->private_->is_seeking = false;
2952 /* shift out the samples before target_sample */
2953 if(delta > 0) {
2954 unsigned channel;
2955 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2956 for(channel = 0; channel < frame->header.channels; channel++)
2957 newbuffer[channel] = buffer[channel] + delta;
2958 decoder->private_->last_frame.header.blocksize -= delta;
2959 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2960 /* write the relevant samples */
2961 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2962 }
2963 else {
2964 /* write the relevant samples */
2965 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2966 }
2967 }
2968 else {
2969 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2970 }
2971 }
2972 else {
2973 /*
2974 * If we never got STREAMINFO, turn off MD5 checking to save
2975 * cycles since we don't have a sum to compare to anyway
2976 */
2977 if(!decoder->private_->has_stream_info)
2978 decoder->private_->do_md5_checking = false;
2979 if(decoder->private_->do_md5_checking) {
2980 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2981 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2982 }
2983 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2984 }
2985 }
2986
send_error_to_client_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status)2987 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2988 {
2989 if(!decoder->private_->is_seeking)
2990 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2991 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2992 decoder->private_->unparseable_frame_count++;
2993 }
2994
seek_to_absolute_sample_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)2995 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2996 {
2997 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2998 FLAC__int64 pos = -1;
2999 int i;
3000 unsigned approx_bytes_per_frame;
3001 FLAC__bool first_seek = true;
3002 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
3003 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
3004 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
3005 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
3006 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
3007 /* take these from the current frame in case they've changed mid-stream */
3008 unsigned channels = FLAC__stream_decoder_get_channels(decoder);
3009 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
3010 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
3011
3012 /* use values from stream info if we didn't decode a frame */
3013 if(channels == 0)
3014 channels = decoder->private_->stream_info.data.stream_info.channels;
3015 if(bps == 0)
3016 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3017
3018 /* we are just guessing here */
3019 if(max_framesize > 0)
3020 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3021 /*
3022 * Check if it's a known fixed-blocksize stream. Note that though
3023 * the spec doesn't allow zeroes in the STREAMINFO block, we may
3024 * never get a STREAMINFO block when decoding so the value of
3025 * min_blocksize might be zero.
3026 */
3027 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3028 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
3029 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3030 }
3031 else
3032 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3033
3034 /*
3035 * First, we set an upper and lower bound on where in the
3036 * stream we will search. For now we assume the worst case
3037 * scenario, which is our best guess at the beginning of
3038 * the first frame and end of the stream.
3039 */
3040 lower_bound = first_frame_offset;
3041 lower_bound_sample = 0;
3042 upper_bound = stream_length;
3043 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3044
3045 /*
3046 * Now we refine the bounds if we have a seektable with
3047 * suitable points. Note that according to the spec they
3048 * must be ordered by ascending sample number.
3049 *
3050 * Note: to protect against invalid seek tables we will ignore points
3051 * that have frame_samples==0 or sample_number>=total_samples
3052 */
3053 if(seek_table) {
3054 FLAC__uint64 new_lower_bound = lower_bound;
3055 FLAC__uint64 new_upper_bound = upper_bound;
3056 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3057 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3058
3059 /* find the closest seek point <= target_sample, if it exists */
3060 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3061 if(
3062 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3063 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3064 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3065 seek_table->points[i].sample_number <= target_sample
3066 )
3067 break;
3068 }
3069 if(i >= 0) { /* i.e. we found a suitable seek point... */
3070 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3071 new_lower_bound_sample = seek_table->points[i].sample_number;
3072 }
3073
3074 /* find the closest seek point > target_sample, if it exists */
3075 for(i = 0; i < (int)seek_table->num_points; i++) {
3076 if(
3077 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3078 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3079 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3080 seek_table->points[i].sample_number > target_sample
3081 )
3082 break;
3083 }
3084 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3085 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3086 new_upper_bound_sample = seek_table->points[i].sample_number;
3087 }
3088 /* final protection against unsorted seek tables; keep original values if bogus */
3089 if(new_upper_bound >= new_lower_bound) {
3090 lower_bound = new_lower_bound;
3091 upper_bound = new_upper_bound;
3092 lower_bound_sample = new_lower_bound_sample;
3093 upper_bound_sample = new_upper_bound_sample;
3094 }
3095 }
3096
3097 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3098 /* there are 2 insidious ways that the following equality occurs, which
3099 * we need to fix:
3100 * 1) total_samples is 0 (unknown) and target_sample is 0
3101 * 2) total_samples is 0 (unknown) and target_sample happens to be
3102 * exactly equal to the last seek point in the seek table; this
3103 * means there is no seek point above it, and upper_bound_samples
3104 * remains equal to the estimate (of target_samples) we made above
3105 * in either case it does not hurt to move upper_bound_sample up by 1
3106 */
3107 if(upper_bound_sample == lower_bound_sample)
3108 upper_bound_sample++;
3109
3110 decoder->private_->target_sample = target_sample;
3111 while(1) {
3112 /* check if the bounds are still ok */
3113 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3114 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3115 return false;
3116 }
3117 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3118 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(target_sample - lower_bound_sample) / (FLAC__double)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3119 #else
3120 /* a little less accurate: */
3121 if(upper_bound - lower_bound < 0xffffffff)
3122 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;
3123 else /* @@@ WATCHOUT, ~2TB limit */
3124 pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8)) / ((upper_bound_sample - lower_bound_sample)>>16)) - approx_bytes_per_frame;
3125 #endif
3126 if(pos >= (FLAC__int64)upper_bound)
3127 pos = (FLAC__int64)upper_bound - 1;
3128 if(pos < (FLAC__int64)lower_bound)
3129 pos = (FLAC__int64)lower_bound;
3130 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3131 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3132 return false;
3133 }
3134 if(!FLAC__stream_decoder_flush(decoder)) {
3135 /* above call sets the state for us */
3136 return false;
3137 }
3138 /* Now we need to get a frame. First we need to reset our
3139 * unparseable_frame_count; if we get too many unparseable
3140 * frames in a row, the read callback will return
3141 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3142 * FLAC__stream_decoder_process_single() to return false.
3143 */
3144 decoder->private_->unparseable_frame_count = 0;
3145 if(!FLAC__stream_decoder_process_single(decoder)) {
3146 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3147 return false;
3148 }
3149 /* our write callback will change the state when it gets to the target frame */
3150 /* 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 */
3151 #if 0
3152 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3153 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3154 break;
3155 #endif
3156 if(!decoder->private_->is_seeking)
3157 break;
3158
3159 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3160 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3161
3162 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3163 if (pos == (FLAC__int64)lower_bound) {
3164 /* can't move back any more than the first frame, something is fatally wrong */
3165 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3166 return false;
3167 }
3168 /* our last move backwards wasn't big enough, try again */
3169 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
3170 continue;
3171 }
3172 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3173 first_seek = false;
3174
3175 /* make sure we are not seeking in corrupted stream */
3176 if (this_frame_sample < lower_bound_sample) {
3177 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3178 return false;
3179 }
3180
3181 /* we need to narrow the search */
3182 if(target_sample < this_frame_sample) {
3183 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3184 /*@@@@@@ what will decode position be if at end of stream? */
3185 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3186 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3187 return false;
3188 }
3189 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16);
3190 }
3191 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3192 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3193 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3194 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3195 return false;
3196 }
3197 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16);
3198 }
3199 }
3200
3201 return true;
3202 }
3203
3204 #if FLAC__HAS_OGG
seek_to_absolute_sample_ogg_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)3205 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3206 {
3207 FLAC__uint64 left_pos = 0, right_pos = stream_length;
3208 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3209 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1;
3210 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3211 FLAC__bool did_a_seek;
3212 unsigned iteration = 0;
3213
3214 /* In the first iterations, we will calculate the target byte position
3215 * by the distance from the target sample to left_sample and
3216 * right_sample (let's call it "proportional search"). After that, we
3217 * will switch to binary search.
3218 */
3219 unsigned BINARY_SEARCH_AFTER_ITERATION = 2;
3220
3221 /* We will switch to a linear search once our current sample is less
3222 * than this number of samples ahead of the target sample
3223 */
3224 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3225
3226 /* If the total number of samples is unknown, use a large value, and
3227 * force binary search immediately.
3228 */
3229 if(right_sample == 0) {
3230 right_sample = (FLAC__uint64)(-1);
3231 BINARY_SEARCH_AFTER_ITERATION = 0;
3232 }
3233
3234 decoder->private_->target_sample = target_sample;
3235 for( ; ; iteration++) {
3236 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3237 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3238 pos = (right_pos + left_pos) / 2;
3239 }
3240 else {
3241 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3242 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos));
3243 #else
3244 /* a little less accurate: */
3245 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3246 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3247 else /* @@@ WATCHOUT, ~2TB limit */
3248 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3249 #endif
3250 /* @@@ TODO: might want to limit pos to some distance
3251 * before EOF, to make sure we land before the last frame,
3252 * thereby getting a this_frame_sample and so having a better
3253 * estimate.
3254 */
3255 }
3256
3257 /* physical seek */
3258 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3259 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3260 return false;
3261 }
3262 if(!FLAC__stream_decoder_flush(decoder)) {
3263 /* above call sets the state for us */
3264 return false;
3265 }
3266 did_a_seek = true;
3267 }
3268 else
3269 did_a_seek = false;
3270
3271 decoder->private_->got_a_frame = false;
3272 if(!FLAC__stream_decoder_process_single(decoder)) {
3273 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3274 return false;
3275 }
3276 if(!decoder->private_->got_a_frame) {
3277 if(did_a_seek) {
3278 /* this can happen if we seek to a point after the last frame; we drop
3279 * to binary search right away in this case to avoid any wasted
3280 * iterations of proportional search.
3281 */
3282 right_pos = pos;
3283 BINARY_SEARCH_AFTER_ITERATION = 0;
3284 }
3285 else {
3286 /* this can probably only happen if total_samples is unknown and the
3287 * target_sample is past the end of the stream
3288 */
3289 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3290 return false;
3291 }
3292 }
3293 /* our write callback will change the state when it gets to the target frame */
3294 else if(!decoder->private_->is_seeking) {
3295 break;
3296 }
3297 else {
3298 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3299 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3300
3301 if (did_a_seek) {
3302 if (this_frame_sample <= target_sample) {
3303 /* The 'equal' case should not happen, since
3304 * FLAC__stream_decoder_process_single()
3305 * should recognize that it has hit the
3306 * target sample and we would exit through
3307 * the 'break' above.
3308 */
3309 FLAC__ASSERT(this_frame_sample != target_sample);
3310
3311 left_sample = this_frame_sample;
3312 /* sanity check to avoid infinite loop */
3313 if (left_pos == pos) {
3314 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3315 return false;
3316 }
3317 left_pos = pos;
3318 }
3319 else if(this_frame_sample > target_sample) {
3320 right_sample = this_frame_sample;
3321 /* sanity check to avoid infinite loop */
3322 if (right_pos == pos) {
3323 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3324 return false;
3325 }
3326 right_pos = pos;
3327 }
3328 }
3329 }
3330 }
3331
3332 return true;
3333 }
3334 #endif
3335
file_read_callback_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)3336 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3337 {
3338 (void)client_data;
3339
3340 if(*bytes > 0) {
3341 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3342 if(ferror(decoder->private_->file))
3343 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3344 else if(*bytes == 0)
3345 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3346 else
3347 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3348 }
3349 else
3350 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3351 }
3352
file_seek_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 absolute_byte_offset,void * client_data)3353 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3354 {
3355 (void)client_data;
3356
3357 if(decoder->private_->file == stdin)
3358 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3359 else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0)
3360 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3361 else
3362 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3363 }
3364
file_tell_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * absolute_byte_offset,void * client_data)3365 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3366 {
3367 FLAC__off_t pos;
3368 (void)client_data;
3369
3370 if(decoder->private_->file == stdin)
3371 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3372 else if((pos = ftello(decoder->private_->file)) < 0)
3373 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3374 else {
3375 *absolute_byte_offset = (FLAC__uint64)pos;
3376 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3377 }
3378 }
3379
file_length_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * stream_length,void * client_data)3380 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3381 {
3382 struct flac_stat_s filestats;
3383 (void)client_data;
3384
3385 if(decoder->private_->file == stdin)
3386 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3387 else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0)
3388 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3389 else {
3390 *stream_length = (FLAC__uint64)filestats.st_size;
3391 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3392 }
3393 }
3394
file_eof_callback_(const FLAC__StreamDecoder * decoder,void * client_data)3395 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3396 {
3397 (void)client_data;
3398
3399 return feof(decoder->private_->file)? true : false;
3400 }
3401