Add codec ID for Shorten audio.
[libav.git] / libavformat / riff.c
1 /*
2 * RIFF codec tags
3 * Copyright (c) 2000 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avformat.h"
23 #include "avcodec.h"
24 #include "riff.h"
25
26 /* Note: when encoding, the first matching tag is used, so order is
27 important if multiple tags possible for a given codec. */
28 const CodecTag codec_bmp_tags[] = {
29 { CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
30 { CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
31 { CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
32 { CODEC_ID_H264, MKTAG('x', '2', '6', '4') },
33 { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') },
34 { CODEC_ID_H264, MKTAG('V', 'S', 'S', 'H') },
35
36 { CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
37 { CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
38 { CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
39 { CODEC_ID_H261, MKTAG('H', '2', '6', '1') },
40
41 /* added based on MPlayer */
42 { CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
43 { CODEC_ID_H263P, MKTAG('v', 'i', 'v', '1') },
44
45 { CODEC_ID_MPEG4, MKTAG('F', 'M', 'P', '4')},
46 { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X'), .invalid_asf = 1 },
47 { CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0'), .invalid_asf = 1 },
48 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D'), .invalid_asf = 1 },
49 { CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
50 { CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
51 { CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
52
53 /* added based on MPlayer */
54 { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
55 { CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
56 { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
57 { CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
58 { CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
59 { CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },
60
61 { CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },
62
63 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3'), .invalid_asf = 1 }, /* default signature when using MSMPEG4 */
64 { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
65
66 /* added based on MPlayer */
67 { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
68 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
69 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
70 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
71 { CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
72 { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
73 { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },
74
75 { CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
76
77 /* added based on MPlayer */
78 { CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },
79
80 { CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },
81
82 { CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },
83
84 /* added based on MPlayer */
85 { CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
86 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
87 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
88 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
89 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
90 { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
91 { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
92 { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
93 { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
94 { CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
95 { CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
96 { CODEC_ID_MPEG1VIDEO, 0x10000001 },
97 { CODEC_ID_MPEG2VIDEO, 0x10000002 },
98 { CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
99 { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
100 { CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
101 { CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
102 { CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
103 { CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
104 { CODEC_ID_JPEGLS, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
105 { CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
106 { CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
107 { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
108 { CODEC_ID_RAWVIDEO, 0 },
109 { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
110 { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
111 { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
112 { CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
113 { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
114 { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
115 { CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
116 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
117 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
118 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
119 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
120 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
121 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
122 { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
123 { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
124 { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
125 { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
126 { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
127 { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
128 { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
129 { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
130 { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
131 { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
132 { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
133 { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
134 { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
135 { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
136 { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
137 { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
138 { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
139 { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
140 { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
141 { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
142 { CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
143 { CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
144 { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
145 { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
146 { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
147 { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
148 { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
149 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
150 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
151 { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
152 { CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
153 { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
154 { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
155 { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
156 { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
157 { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
158 { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
159 { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
160 { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
161 { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
162 { CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
163 { CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
164 { CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
165 { CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
166 { CODEC_ID_NONE, 0 },
167 };
168
169 const CodecTag codec_wav_tags[] = {
170 { CODEC_ID_MP2, 0x50 },
171 { CODEC_ID_MP3, 0x55 },
172 { CODEC_ID_AC3, 0x2000 },
173 { CODEC_ID_DTS, 0x2001 },
174 { CODEC_ID_PCM_S16LE, 0x01 },
175 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
176 { CODEC_ID_PCM_S24LE, 0x01 },
177 { CODEC_ID_PCM_S32LE, 0x01 },
178 { CODEC_ID_PCM_ALAW, 0x06 },
179 { CODEC_ID_PCM_MULAW, 0x07 },
180 { CODEC_ID_ADPCM_MS, 0x02 },
181 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
182 { CODEC_ID_ADPCM_YAMAHA, 0x20 },
183 { CODEC_ID_ADPCM_G726, 0x45 },
184 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
185 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
186 { CODEC_ID_WMAV1, 0x160 },
187 { CODEC_ID_WMAV2, 0x161 },
188 { CODEC_ID_AAC, 0x706d },
189 { CODEC_ID_MPEG4AAC, 0xff },
190 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
191 { CODEC_ID_SONIC, 0x2048 },
192 { CODEC_ID_SONIC_LS, 0x2048 },
193 { CODEC_ID_ADPCM_CT, 0x200 },
194 { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
195 { CODEC_ID_TRUESPEECH, 0x22 },
196 { CODEC_ID_FLAC, MKTAG('f', 'L', 'a', 'C') },
197 { CODEC_ID_TTA, MKTAG('T', 'T', 'A', '1') },
198 { CODEC_ID_WAVPACK, MKTAG('W', 'V', 'P', 'K') },
199 { CODEC_ID_SHORTEN, MKTAG('s', 'h', 'r', 'n') },
200
201 // for NuppelVideo (nuv.c)
202 { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
203 { CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
204 { 0, 0 },
205 };
206
207 unsigned int codec_get_tag(const CodecTag *tags, int id)
208 {
209 while (tags->id != CODEC_ID_NONE) {
210 if (tags->id == id)
211 return tags->tag;
212 tags++;
213 }
214 return 0;
215 }
216
217 unsigned int codec_get_asf_tag(const CodecTag *tags, unsigned int id)
218 {
219 while (tags->id != CODEC_ID_NONE) {
220 if (!tags->invalid_asf && tags->id == id)
221 return tags->tag;
222 tags++;
223 }
224 return 0;
225 }
226
227 enum CodecID codec_get_id(const CodecTag *tags, unsigned int tag)
228 {
229 while (tags->id != CODEC_ID_NONE) {
230 if( toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
231 && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
232 && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
233 && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
234 return tags->id;
235 tags++;
236 }
237 return CODEC_ID_NONE;
238 }
239
240 unsigned int codec_get_bmp_tag(int id)
241 {
242 return codec_get_tag(codec_bmp_tags, id);
243 }
244
245 unsigned int codec_get_wav_tag(int id)
246 {
247 return codec_get_tag(codec_wav_tags, id);
248 }
249
250 enum CodecID codec_get_bmp_id(unsigned int tag)
251 {
252 return codec_get_id(codec_bmp_tags, tag);
253 }
254
255 enum CodecID codec_get_wav_id(unsigned int tag)
256 {
257 return codec_get_id(codec_wav_tags, tag);
258 }
259
260 #ifdef CONFIG_MUXERS
261 offset_t start_tag(ByteIOContext *pb, const char *tag)
262 {
263 put_tag(pb, tag);
264 put_le32(pb, 0);
265 return url_ftell(pb);
266 }
267
268 void end_tag(ByteIOContext *pb, offset_t start)
269 {
270 offset_t pos;
271
272 pos = url_ftell(pb);
273 url_fseek(pb, start - 4, SEEK_SET);
274 put_le32(pb, (uint32_t)(pos - start));
275 url_fseek(pb, pos, SEEK_SET);
276 }
277
278 /* WAVEFORMATEX header */
279 /* returns the size or -1 on error */
280 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
281 {
282 int bps, blkalign, bytespersec;
283 int hdrsize = 18;
284
285 if(!enc->codec_tag || enc->codec_tag > 0xffff)
286 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
287 if(!enc->codec_tag || enc->codec_tag > 0xffff)
288 return -1;
289
290 put_le16(pb, enc->codec_tag);
291 put_le16(pb, enc->channels);
292 put_le32(pb, enc->sample_rate);
293 if (enc->codec_id == CODEC_ID_PCM_U8 ||
294 enc->codec_id == CODEC_ID_PCM_ALAW ||
295 enc->codec_id == CODEC_ID_PCM_MULAW) {
296 bps = 8;
297 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
298 bps = 0;
299 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS || enc->codec_id == CODEC_ID_ADPCM_G726 || enc->codec_id == CODEC_ID_ADPCM_YAMAHA) { //
300 bps = 4;
301 } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
302 bps = 24;
303 } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
304 bps = 32;
305 } else {
306 bps = 16;
307 }
308
309 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
310 blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
311 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
312 } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
313 blkalign = 1;
314 } else if (enc->block_align != 0) { /* specified by the codec */
315 blkalign = enc->block_align;
316 } else
317 blkalign = enc->channels*bps >> 3;
318 if (enc->codec_id == CODEC_ID_PCM_U8 ||
319 enc->codec_id == CODEC_ID_PCM_S24LE ||
320 enc->codec_id == CODEC_ID_PCM_S32LE ||
321 enc->codec_id == CODEC_ID_PCM_S16LE) {
322 bytespersec = enc->sample_rate * blkalign;
323 } else {
324 bytespersec = enc->bit_rate / 8;
325 }
326 put_le32(pb, bytespersec); /* bytes per second */
327 put_le16(pb, blkalign); /* block align */
328 put_le16(pb, bps); /* bits per sample */
329 if (enc->codec_id == CODEC_ID_MP3) {
330 put_le16(pb, 12); /* wav_extra_size */
331 hdrsize += 12;
332 put_le16(pb, 1); /* wID */
333 put_le32(pb, 2); /* fdwFlags */
334 put_le16(pb, 1152); /* nBlockSize */
335 put_le16(pb, 1); /* nFramesPerBlock */
336 put_le16(pb, 1393); /* nCodecDelay */
337 } else if (enc->codec_id == CODEC_ID_MP2) {
338 put_le16(pb, 22); /* wav_extra_size */
339 hdrsize += 22;
340 put_le16(pb, 2); /* fwHeadLayer */
341 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
342 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
343 put_le16(pb, 0); /* fwHeadModeExt */
344 put_le16(pb, 1); /* wHeadEmphasis */
345 put_le16(pb, 16); /* fwHeadFlags */
346 put_le32(pb, 0); /* dwPTSLow */
347 put_le32(pb, 0); /* dwPTSHigh */
348 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
349 put_le16(pb, 2); /* wav_extra_size */
350 hdrsize += 2;
351 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
352 } else if(enc->extradata_size){
353 put_le16(pb, enc->extradata_size);
354 put_buffer(pb, enc->extradata, enc->extradata_size);
355 hdrsize += enc->extradata_size;
356 if(hdrsize&1){
357 hdrsize++;
358 put_byte(pb, 0);
359 }
360 } else {
361 hdrsize -= 2;
362 }
363
364 return hdrsize;
365 }
366
367 /* BITMAPINFOHEADER header */
368 void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const CodecTag *tags, int for_asf)
369 {
370 put_le32(pb, 40 + enc->extradata_size); /* size */
371 put_le32(pb, enc->width);
372 put_le32(pb, enc->height);
373 put_le16(pb, 1); /* planes */
374
375 put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
376 /* compression type */
377 put_le32(pb, for_asf ? (enc->codec_tag ? enc->codec_tag : codec_get_asf_tag(tags, enc->codec_id)) : enc->codec_tag); //
378 put_le32(pb, enc->width * enc->height * 3);
379 put_le32(pb, 0);
380 put_le32(pb, 0);
381 put_le32(pb, 0);
382 put_le32(pb, 0);
383
384 put_buffer(pb, enc->extradata, enc->extradata_size);
385
386 if (enc->extradata_size & 1)
387 put_byte(pb, 0);
388 }
389 #endif //CONFIG_MUXERS
390
391 #ifdef CONFIG_DEMUXERS
392 /* We could be given one of the three possible structures here:
393 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
394 * is an expansion of the previous one with the fields added
395 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
396 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
397 * an openended structure.
398 */
399 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
400 {
401 int id;
402
403 id = get_le16(pb);
404 codec->codec_type = CODEC_TYPE_AUDIO;
405 codec->codec_tag = id;
406 codec->channels = get_le16(pb);
407 codec->sample_rate = get_le32(pb);
408 codec->bit_rate = get_le32(pb) * 8;
409 codec->block_align = get_le16(pb);
410 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
411 codec->bits_per_sample = 8;
412 }else
413 codec->bits_per_sample = get_le16(pb);
414 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
415
416 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
417 codec->extradata_size = get_le16(pb);
418 if (codec->extradata_size > 0) {
419 if (codec->extradata_size > size - 18)
420 codec->extradata_size = size - 18;
421 codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
422 get_buffer(pb, codec->extradata, codec->extradata_size);
423 } else
424 codec->extradata_size = 0;
425
426 /* It is possible for the chunk to contain garbage at the end */
427 if (size - codec->extradata_size - 18 > 0)
428 url_fskip(pb, size - codec->extradata_size - 18);
429 }
430 }
431
432
433 int wav_codec_get_id(unsigned int tag, int bps)
434 {
435 int id;
436 id = codec_get_id(codec_wav_tags, tag);
437 if (id <= 0)
438 return id;
439 /* handle specific u8 codec */
440 if (id == CODEC_ID_PCM_S16LE && bps == 8)
441 id = CODEC_ID_PCM_U8;
442 if (id == CODEC_ID_PCM_S16LE && bps == 24)
443 id = CODEC_ID_PCM_S24LE;
444 if (id == CODEC_ID_PCM_S16LE && bps == 32)
445 id = CODEC_ID_PCM_S32LE;
446 return id;
447 }
448 #endif // CONFIG_DEMUXERS
449
450 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
451 {
452 int gcd;
453
454 *au_ssize= stream->block_align;
455 if(stream->frame_size && stream->sample_rate){
456 *au_scale=stream->frame_size;
457 *au_rate= stream->sample_rate;
458 }else if(stream->codec_type == CODEC_TYPE_VIDEO){
459 *au_scale= stream->time_base.num;
460 *au_rate = stream->time_base.den;
461 }else{
462 *au_scale= stream->block_align ? stream->block_align*8 : 8;
463 *au_rate = stream->bit_rate;
464 }
465 gcd= ff_gcd(*au_scale, *au_rate);
466 *au_scale /= gcd;
467 *au_rate /= gcd;
468 }