() 10l
[libav.git] / libavformat / riff.c
CommitLineData
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1/*
2 * RIFF codec tags
3 * Copyright (c) 2000 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20#include "avformat.h"
21#include "avcodec.h"
22#include "riff.h"
23
24/* Note: when encoding, the first matching tag is used, so order is
25 important if multiple tags possible for a given codec. */
26const CodecTag codec_bmp_tags[] = {
27 { CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
28 { CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
29 { CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
30 { CODEC_ID_H264, MKTAG('x', '2', '6', '4') },
31 { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') },
32 { CODEC_ID_H264, MKTAG('V', 'S', 'S', 'H') },
33
34 { CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
35 { CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
36 { CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
37 { CODEC_ID_H261, MKTAG('H', '2', '6', '1') },
38
39 /* added based on MPlayer */
40 { CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
41 { CODEC_ID_H263P, MKTAG('v', 'i', 'v', '1') },
42
43 { CODEC_ID_MPEG4, MKTAG('F', 'M', 'P', '4')},
44 { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X'), .invalid_asf = 1 },
45 { CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0'), .invalid_asf = 1 },
46 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D'), .invalid_asf = 1 },
47 { CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
48 { CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
49 { CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
50
51 /* added based on MPlayer */
52 { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
53 { CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
54 { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
55 { CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
56 { CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
57 { CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },
58
59 { CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },
60
61 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3'), .invalid_asf = 1 }, /* default signature when using MSMPEG4 */
62 { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
63
64 /* added based on MPlayer */
65 { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
66 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
67 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
68 { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
69 { CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
70 { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
71 { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },
72
73 { CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
74
75 /* added based on MPlayer */
76 { CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },
77
78 { CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },
79
80 { CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },
81
82 /* added based on MPlayer */
83 { CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
84 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
85 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
86 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
87 { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
88 { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
89 { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
90 { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
91 { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
92 { CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
93 { CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
94 { CODEC_ID_MPEG1VIDEO, 0x10000001 },
95 { CODEC_ID_MPEG2VIDEO, 0x10000002 },
96 { CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
97 { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
98 { CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
99 { CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
100 { CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
101 { CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
102 { CODEC_ID_JPEGLS, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
103 { CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
104 { CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
105 { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
af5ba08e 106 { CODEC_ID_RAWVIDEO, 0 },
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107 { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
108 { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
109 { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
0b23d689 110 { CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
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111 { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
112 { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
3c619838 113 { CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
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114 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
115 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
116 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
117 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
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118 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
119 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
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120 { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
121 { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
122 { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
123 { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
124 { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
125 { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
126 { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
127 { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
128 { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
129 { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
130 { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
131 { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
132 { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
133 { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
134 { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
135 { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
136 { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
137 { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
138 { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
139 { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
140 { CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
aa8f4cee 141 { CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
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142 { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
143 { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
144 { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
145 { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
146 { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
147 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
148 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
149 { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
04ae12e9 150 { CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
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151 { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
152 { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
153 { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
154 { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
155 { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
156 { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
157 { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
158 { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
159 { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
160 { CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
67630cff 161 { CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
f31065f6 162 { CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
eb57c889 163 { CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
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164 { CODEC_ID_NONE, 0 },
165};
166
167const CodecTag codec_wav_tags[] = {
168 { CODEC_ID_MP2, 0x50 },
169 { CODEC_ID_MP3, 0x55 },
170 { CODEC_ID_AC3, 0x2000 },
171 { CODEC_ID_DTS, 0x2001 },
172 { CODEC_ID_PCM_S16LE, 0x01 },
173 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
174 { CODEC_ID_PCM_S24LE, 0x01 },
175 { CODEC_ID_PCM_S32LE, 0x01 },
176 { CODEC_ID_PCM_ALAW, 0x06 },
177 { CODEC_ID_PCM_MULAW, 0x07 },
178 { CODEC_ID_ADPCM_MS, 0x02 },
179 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
180 { CODEC_ID_ADPCM_YAMAHA, 0x20 },
181 { CODEC_ID_ADPCM_G726, 0x45 },
182 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
183 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
184 { CODEC_ID_WMAV1, 0x160 },
185 { CODEC_ID_WMAV2, 0x161 },
186 { CODEC_ID_AAC, 0x706d },
83318919 187 { CODEC_ID_MPEG4AAC, 0xff },
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188 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
189 { CODEC_ID_SONIC, 0x2048 },
190 { CODEC_ID_SONIC_LS, 0x2048 },
191 { CODEC_ID_ADPCM_CT, 0x200 },
192 { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
193 { CODEC_ID_TRUESPEECH, 0x22 },
4b1a1a2a 194 { CODEC_ID_FLAC, MKTAG('f', 'L', 'a', 'C') },
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195
196 // for NuppelVideo (nuv.c)
197 { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
198 { CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
199 { 0, 0 },
200};
201
202unsigned int codec_get_tag(const CodecTag *tags, int id)
203{
204 while (tags->id != CODEC_ID_NONE) {
205 if (tags->id == id)
206 return tags->tag;
207 tags++;
208 }
209 return 0;
210}
211
212unsigned int codec_get_asf_tag(const CodecTag *tags, unsigned int id)
213{
214 while (tags->id != CODEC_ID_NONE) {
215 if (!tags->invalid_asf && tags->id == id)
216 return tags->tag;
217 tags++;
218 }
219 return 0;
220}
221
222enum CodecID codec_get_id(const CodecTag *tags, unsigned int tag)
223{
224 while (tags->id != CODEC_ID_NONE) {
225 if( toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
226 && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
227 && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
228 && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
229 return tags->id;
230 tags++;
231 }
232 return CODEC_ID_NONE;
233}
234
235unsigned int codec_get_bmp_tag(int id)
236{
237 return codec_get_tag(codec_bmp_tags, id);
238}
239
240unsigned int codec_get_wav_tag(int id)
241{
242 return codec_get_tag(codec_wav_tags, id);
243}
244
245enum CodecID codec_get_bmp_id(unsigned int tag)
246{
247 return codec_get_id(codec_bmp_tags, tag);
248}
249
250enum CodecID codec_get_wav_id(unsigned int tag)
251{
252 return codec_get_id(codec_wav_tags, tag);
253}
254
255#ifdef CONFIG_MUXERS
256offset_t start_tag(ByteIOContext *pb, const char *tag)
257{
258 put_tag(pb, tag);
259 put_le32(pb, 0);
260 return url_ftell(pb);
261}
262
263void end_tag(ByteIOContext *pb, offset_t start)
264{
265 offset_t pos;
266
267 pos = url_ftell(pb);
268 url_fseek(pb, start - 4, SEEK_SET);
269 put_le32(pb, (uint32_t)(pos - start));
270 url_fseek(pb, pos, SEEK_SET);
271}
272
273/* WAVEFORMATEX header */
274/* returns the size or -1 on error */
275int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
276{
277 int bps, blkalign, bytespersec;
278 int hdrsize = 18;
279
280 if(!enc->codec_tag || enc->codec_tag > 0xffff)
281 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
92eb8232 282 if(!enc->codec_tag || enc->codec_tag > 0xffff)
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283 return -1;
284
285 put_le16(pb, enc->codec_tag);
286 put_le16(pb, enc->channels);
287 put_le32(pb, enc->sample_rate);
288 if (enc->codec_id == CODEC_ID_PCM_U8 ||
289 enc->codec_id == CODEC_ID_PCM_ALAW ||
290 enc->codec_id == CODEC_ID_PCM_MULAW) {
291 bps = 8;
292 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
293 bps = 0;
294 } 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) { //
295 bps = 4;
296 } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
297 bps = 24;
298 } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
299 bps = 32;
300 } else {
301 bps = 16;
302 }
303
304 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
305 blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
306 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
307 } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
308 blkalign = 1;
309 } else if (enc->block_align != 0) { /* specified by the codec */
310 blkalign = enc->block_align;
311 } else
312 blkalign = enc->channels*bps >> 3;
313 if (enc->codec_id == CODEC_ID_PCM_U8 ||
314 enc->codec_id == CODEC_ID_PCM_S24LE ||
315 enc->codec_id == CODEC_ID_PCM_S32LE ||
316 enc->codec_id == CODEC_ID_PCM_S16LE) {
317 bytespersec = enc->sample_rate * blkalign;
318 } else {
319 bytespersec = enc->bit_rate / 8;
320 }
321 put_le32(pb, bytespersec); /* bytes per second */
322 put_le16(pb, blkalign); /* block align */
323 put_le16(pb, bps); /* bits per sample */
324 if (enc->codec_id == CODEC_ID_MP3) {
325 put_le16(pb, 12); /* wav_extra_size */
326 hdrsize += 12;
327 put_le16(pb, 1); /* wID */
328 put_le32(pb, 2); /* fdwFlags */
329 put_le16(pb, 1152); /* nBlockSize */
330 put_le16(pb, 1); /* nFramesPerBlock */
331 put_le16(pb, 1393); /* nCodecDelay */
332 } else if (enc->codec_id == CODEC_ID_MP2) {
333 put_le16(pb, 22); /* wav_extra_size */
334 hdrsize += 22;
335 put_le16(pb, 2); /* fwHeadLayer */
336 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
337 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
338 put_le16(pb, 0); /* fwHeadModeExt */
339 put_le16(pb, 1); /* wHeadEmphasis */
340 put_le16(pb, 16); /* fwHeadFlags */
341 put_le32(pb, 0); /* dwPTSLow */
342 put_le32(pb, 0); /* dwPTSHigh */
343 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
344 put_le16(pb, 2); /* wav_extra_size */
345 hdrsize += 2;
346 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
347 } else if(enc->extradata_size){
348 put_le16(pb, enc->extradata_size);
349 put_buffer(pb, enc->extradata, enc->extradata_size);
350 hdrsize += enc->extradata_size;
351 if(hdrsize&1){
352 hdrsize++;
353 put_byte(pb, 0);
354 }
355 } else {
356 hdrsize -= 2;
357 }
358
359 return hdrsize;
360}
361
362/* BITMAPINFOHEADER header */
363void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const CodecTag *tags, int for_asf)
364{
365 put_le32(pb, 40 + enc->extradata_size); /* size */
366 put_le32(pb, enc->width);
367 put_le32(pb, enc->height);
368 put_le16(pb, 1); /* planes */
369
370 put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
371 /* compression type */
372 put_le32(pb, for_asf ? (enc->codec_tag ? enc->codec_tag : codec_get_asf_tag(tags, enc->codec_id)) : enc->codec_tag); //
373 put_le32(pb, enc->width * enc->height * 3);
374 put_le32(pb, 0);
375 put_le32(pb, 0);
376 put_le32(pb, 0);
377 put_le32(pb, 0);
378
379 put_buffer(pb, enc->extradata, enc->extradata_size);
380
381 if (enc->extradata_size & 1)
382 put_byte(pb, 0);
383}
384#endif //CONFIG_MUXERS
385
386#ifdef CONFIG_DEMUXERS
387/* We could be given one of the three possible structures here:
388 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
389 * is an expansion of the previous one with the fields added
390 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
391 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
392 * an openended structure.
393 */
394void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
395{
396 int id;
397
398 id = get_le16(pb);
399 codec->codec_type = CODEC_TYPE_AUDIO;
400 codec->codec_tag = id;
401 codec->channels = get_le16(pb);
402 codec->sample_rate = get_le32(pb);
403 codec->bit_rate = get_le32(pb) * 8;
404 codec->block_align = get_le16(pb);
405 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
406 codec->bits_per_sample = 8;
407 }else
408 codec->bits_per_sample = get_le16(pb);
409 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
410
411 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
412 codec->extradata_size = get_le16(pb);
413 if (codec->extradata_size > 0) {
414 if (codec->extradata_size > size - 18)
415 codec->extradata_size = size - 18;
416 codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
417 get_buffer(pb, codec->extradata, codec->extradata_size);
418 } else
419 codec->extradata_size = 0;
420
421 /* It is possible for the chunk to contain garbage at the end */
422 if (size - codec->extradata_size - 18 > 0)
423 url_fskip(pb, size - codec->extradata_size - 18);
424 }
425}
426
427
428int wav_codec_get_id(unsigned int tag, int bps)
429{
430 int id;
431 id = codec_get_id(codec_wav_tags, tag);
432 if (id <= 0)
433 return id;
434 /* handle specific u8 codec */
435 if (id == CODEC_ID_PCM_S16LE && bps == 8)
436 id = CODEC_ID_PCM_U8;
437 if (id == CODEC_ID_PCM_S16LE && bps == 24)
438 id = CODEC_ID_PCM_S24LE;
439 if (id == CODEC_ID_PCM_S16LE && bps == 32)
440 id = CODEC_ID_PCM_S32LE;
441 return id;
442}
443#endif // CONFIG_DEMUXERS
444
445void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
446{
447 int gcd;
448
449 *au_ssize= stream->block_align;
450 if(stream->frame_size && stream->sample_rate){
451 *au_scale=stream->frame_size;
452 *au_rate= stream->sample_rate;
453 }else if(stream->codec_type == CODEC_TYPE_VIDEO){
454 *au_scale= stream->time_base.num;
455 *au_rate = stream->time_base.den;
456 }else{
457 *au_scale= stream->block_align ? stream->block_align*8 : 8;
458 *au_rate = stream->bit_rate;
459 }
460 gcd= ff_gcd(*au_scale, *au_rate);
461 *au_scale /= gcd;
462 *au_rate /= gcd;
463}