1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3
4 © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6
7 1. INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33
34 2. COPYRIGHT LICENSE
35
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60
61 3. NO PATENT LICENSE
62
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70
71 4. DISCLAIMER
72
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83
84 5. CONTACT INFORMATION
85
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94
95 /******************* MPEG transport format encoder library *********************
96
97 Author(s): Alex Groeschel
98
99 Description: ADTS Transport Headers support
100
101 *******************************************************************************/
102
103 #include "tpenc_adts.h"
104
105 #include "tpenc_lib.h"
106 #include "tpenc_asc.h"
107
adtsWrite_CrcStartReg(HANDLE_ADTS pAdts,HANDLE_FDK_BITSTREAM hBs,int mBits)108 int adtsWrite_CrcStartReg(
109 HANDLE_ADTS pAdts, /*!< pointer to adts stucture */
110 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */
111 int mBits /*!< number of bits in crc region */
112 ) {
113 if (pAdts->protection_absent) {
114 return 0;
115 }
116 return (FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits));
117 }
118
adtsWrite_CrcEndReg(HANDLE_ADTS pAdts,HANDLE_FDK_BITSTREAM hBs,int reg)119 void adtsWrite_CrcEndReg(
120 HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */
121 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */
122 int reg /*!< crc region */
123 ) {
124 if (pAdts->protection_absent == 0) {
125 FDKcrcEndReg(&pAdts->crcInfo, hBs, reg);
126 }
127 }
128
adtsWrite_GetHeaderBits(HANDLE_ADTS hAdts)129 int adtsWrite_GetHeaderBits(HANDLE_ADTS hAdts) {
130 int bits = 0;
131
132 if (hAdts->currentBlock == 0) {
133 /* Static and variable header bits */
134 bits = 56;
135 if (!hAdts->protection_absent) {
136 /* Add header/ single raw data block CRC bits */
137 bits += 16;
138 if (hAdts->num_raw_blocks > 0) {
139 /* Add bits of raw data block position markers */
140 bits += (hAdts->num_raw_blocks) * 16;
141 }
142 }
143 }
144 if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) {
145 /* Add raw data block CRC bits. Not really part of the header, put they
146 * cause bit overhead to be accounted. */
147 bits += 16;
148 }
149
150 hAdts->headerBits = bits;
151
152 return bits;
153 }
154
adtsWrite_Init(HANDLE_ADTS hAdts,CODER_CONFIG * config)155 INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config) {
156 /* Sanity checks */
157 if (config->nSubFrames < 1 || config->nSubFrames > 4 ||
158 (int)config->aot > 4 || (int)config->aot < 1) {
159 return -1;
160 }
161
162 /* fixed header */
163 if (config->flags & CC_MPEG_ID) {
164 hAdts->mpeg_id = 0; /* MPEG 4 */
165 } else {
166 hAdts->mpeg_id = 1; /* MPEG 2 */
167 }
168 hAdts->layer = 0;
169 hAdts->protection_absent = !(config->flags & CC_PROTECTION);
170 hAdts->profile = ((int)config->aot) - 1;
171 hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate, 4);
172 hAdts->sample_freq = config->samplingRate;
173 hAdts->private_bit = 0;
174 hAdts->channel_mode = config->channelMode;
175 hAdts->original = 0;
176 hAdts->home = 0;
177 /* variable header */
178 hAdts->copyright_id = 0;
179 hAdts->copyright_start = 0;
180
181 hAdts->num_raw_blocks = config->nSubFrames - 1; /* 0 means 1 raw data block */
182
183 hAdts->channel_config_zero = config->channelConfigZero;
184
185 FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16);
186
187 hAdts->currentBlock = 0;
188
189 return 0;
190 }
191
adtsWrite_EncodeHeader(HANDLE_ADTS hAdts,HANDLE_FDK_BITSTREAM hBitStream,int buffer_fullness,int frame_length)192 int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts, HANDLE_FDK_BITSTREAM hBitStream,
193 int buffer_fullness, int frame_length) {
194 INT crcIndex = 0;
195
196 hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts);
197
198 FDK_ASSERT(((frame_length + hAdts->headerBits) / 8) < 0x2000); /*13 bit*/
199 FDK_ASSERT(buffer_fullness < 0x800); /* 11 bit */
200
201 if (!hAdts->protection_absent) {
202 FDKcrcReset(&hAdts->crcInfo);
203 }
204
205 if (hAdts->currentBlock == 0) {
206 FDKresetBitbuffer(hBitStream, BS_WRITER);
207 }
208
209 hAdts->subFrameStartBit = FDKgetValidBits(hBitStream);
210
211 /* Skip new header if this is raw data block 1..n */
212 if (hAdts->currentBlock == 0) {
213 FDKresetBitbuffer(hBitStream, BS_WRITER);
214
215 if (hAdts->num_raw_blocks == 0) {
216 crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0);
217 }
218
219 /* fixed header */
220 FDKwriteBits(hBitStream, 0xFFF, 12);
221 FDKwriteBits(hBitStream, hAdts->mpeg_id, 1);
222 FDKwriteBits(hBitStream, hAdts->layer, 2);
223 FDKwriteBits(hBitStream, hAdts->protection_absent, 1);
224 FDKwriteBits(hBitStream, hAdts->profile, 2);
225 FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4);
226 FDKwriteBits(hBitStream, hAdts->private_bit, 1);
227 FDKwriteBits(
228 hBitStream,
229 getChannelConfig(hAdts->channel_mode, hAdts->channel_config_zero), 3);
230 FDKwriteBits(hBitStream, hAdts->original, 1);
231 FDKwriteBits(hBitStream, hAdts->home, 1);
232 /* variable header */
233 FDKwriteBits(hBitStream, hAdts->copyright_id, 1);
234 FDKwriteBits(hBitStream, hAdts->copyright_start, 1);
235 FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits) >> 3, 13);
236 FDKwriteBits(hBitStream, buffer_fullness, 11);
237 FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2);
238
239 if (!hAdts->protection_absent) {
240 int i;
241
242 /* End header CRC portion for single raw data block and write dummy zero
243 * values for unknown fields. */
244 if (hAdts->num_raw_blocks == 0) {
245 adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex);
246 } else {
247 for (i = 0; i < hAdts->num_raw_blocks; i++) {
248 FDKwriteBits(hBitStream, 0, 16);
249 }
250 }
251 FDKwriteBits(hBitStream, 0, 16);
252 }
253 } /* End of ADTS header */
254
255 return 0;
256 }
257
adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts,HANDLE_FDK_BITSTREAM hBs,int * pBits)258 void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts, HANDLE_FDK_BITSTREAM hBs,
259 int *pBits) {
260 if (!hAdts->protection_absent) {
261 FDK_BITSTREAM bsWriter;
262
263 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0,
264 BS_WRITER);
265 FDKpushFor(&bsWriter, 56);
266
267 if (hAdts->num_raw_blocks == 0) {
268 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16);
269 } else {
270 int distance;
271
272 /* Write CRC of current raw data block */
273 FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16);
274
275 /* Write distance to current data block */
276 if (hAdts->currentBlock < hAdts->num_raw_blocks) {
277 FDKpushFor(&bsWriter, hAdts->currentBlock * 16);
278 distance =
279 FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks) * 16 + 16);
280 FDKwriteBits(&bsWriter, distance >> 3, 16);
281 }
282 }
283 FDKsyncCache(&bsWriter);
284 }
285
286 /* Write total frame lenth for multiple raw data blocks and header CRC */
287 if (hAdts->num_raw_blocks > 0 &&
288 hAdts->currentBlock == hAdts->num_raw_blocks) {
289 FDK_BITSTREAM bsWriter;
290 int crcIndex = 0;
291
292 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0,
293 BS_WRITER);
294
295 if (!hAdts->protection_absent) {
296 FDKcrcReset(&hAdts->crcInfo);
297 crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0);
298 }
299 /* Write total frame length */
300 FDKpushFor(&bsWriter, 56 - 28 + 2);
301 FDKwriteBits(&bsWriter, FDKgetValidBits(hBs) >> 3, 13);
302
303 /* Write header CRC */
304 if (!hAdts->protection_absent) {
305 FDKpushFor(&bsWriter, 11 + 2 + (hAdts->num_raw_blocks) * 16);
306 FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex);
307 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16);
308 }
309 FDKsyncCache(&bsWriter);
310 }
311
312 /* Correct *pBits to reflect the amount of bits of the current subframe */
313 *pBits -= hAdts->subFrameStartBit;
314 if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) {
315 /* Fixup CRC bits, since they come after each raw data block */
316 *pBits += 16;
317 }
318 hAdts->currentBlock++;
319 }
320