move common stuff from avienc.c and wav.c to new file riff.c
[libav.git] / libavformat / riff.c
CommitLineData
9d9f4119
MR
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') },
106 { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
107 { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
108 { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
109 { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
110 { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
111 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
112 { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
113 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
114 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
115 { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
116 { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
117 { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
118 { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
119 { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
120 { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
121 { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
122 { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
123 { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
124 { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
125 { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
126 { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
127 { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
128 { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
129 { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
130 { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
131 { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
132 { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
133 { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
134 { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
135 { CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
136 { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
137 { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
138 { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
139 { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
140 { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
141 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
142 { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
143 { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
144 { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
145 { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
146 { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
147 { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
148 { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
149 { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
150 { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
151 { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
152 { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
153 { CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
154 { CODEC_ID_RAWVIDEO, 0 },
155 { CODEC_ID_NONE, 0 },
156};
157
158const CodecTag codec_wav_tags[] = {
159 { CODEC_ID_MP2, 0x50 },
160 { CODEC_ID_MP3, 0x55 },
161 { CODEC_ID_AC3, 0x2000 },
162 { CODEC_ID_DTS, 0x2001 },
163 { CODEC_ID_PCM_S16LE, 0x01 },
164 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
165 { CODEC_ID_PCM_S24LE, 0x01 },
166 { CODEC_ID_PCM_S32LE, 0x01 },
167 { CODEC_ID_PCM_ALAW, 0x06 },
168 { CODEC_ID_PCM_MULAW, 0x07 },
169 { CODEC_ID_ADPCM_MS, 0x02 },
170 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
171 { CODEC_ID_ADPCM_YAMAHA, 0x20 },
172 { CODEC_ID_ADPCM_G726, 0x45 },
173 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
174 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
175 { CODEC_ID_WMAV1, 0x160 },
176 { CODEC_ID_WMAV2, 0x161 },
177 { CODEC_ID_AAC, 0x706d },
178 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
179 { CODEC_ID_SONIC, 0x2048 },
180 { CODEC_ID_SONIC_LS, 0x2048 },
181 { CODEC_ID_ADPCM_CT, 0x200 },
182 { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
183 { CODEC_ID_TRUESPEECH, 0x22 },
184
185 // for NuppelVideo (nuv.c)
186 { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
187 { CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
188 { 0, 0 },
189};
190
191unsigned int codec_get_tag(const CodecTag *tags, int id)
192{
193 while (tags->id != CODEC_ID_NONE) {
194 if (tags->id == id)
195 return tags->tag;
196 tags++;
197 }
198 return 0;
199}
200
201unsigned int codec_get_asf_tag(const CodecTag *tags, unsigned int id)
202{
203 while (tags->id != CODEC_ID_NONE) {
204 if (!tags->invalid_asf && tags->id == id)
205 return tags->tag;
206 tags++;
207 }
208 return 0;
209}
210
211enum CodecID codec_get_id(const CodecTag *tags, unsigned int tag)
212{
213 while (tags->id != CODEC_ID_NONE) {
214 if( toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
215 && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
216 && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
217 && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
218 return tags->id;
219 tags++;
220 }
221 return CODEC_ID_NONE;
222}
223
224unsigned int codec_get_bmp_tag(int id)
225{
226 return codec_get_tag(codec_bmp_tags, id);
227}
228
229unsigned int codec_get_wav_tag(int id)
230{
231 return codec_get_tag(codec_wav_tags, id);
232}
233
234enum CodecID codec_get_bmp_id(unsigned int tag)
235{
236 return codec_get_id(codec_bmp_tags, tag);
237}
238
239enum CodecID codec_get_wav_id(unsigned int tag)
240{
241 return codec_get_id(codec_wav_tags, tag);
242}
243
244#ifdef CONFIG_MUXERS
245offset_t start_tag(ByteIOContext *pb, const char *tag)
246{
247 put_tag(pb, tag);
248 put_le32(pb, 0);
249 return url_ftell(pb);
250}
251
252void end_tag(ByteIOContext *pb, offset_t start)
253{
254 offset_t pos;
255
256 pos = url_ftell(pb);
257 url_fseek(pb, start - 4, SEEK_SET);
258 put_le32(pb, (uint32_t)(pos - start));
259 url_fseek(pb, pos, SEEK_SET);
260}
261
262/* WAVEFORMATEX header */
263/* returns the size or -1 on error */
264int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
265{
266 int bps, blkalign, bytespersec;
267 int hdrsize = 18;
268
269 if(!enc->codec_tag || enc->codec_tag > 0xffff)
270 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
271 if(!enc->codec_tag)
272 return -1;
273
274 put_le16(pb, enc->codec_tag);
275 put_le16(pb, enc->channels);
276 put_le32(pb, enc->sample_rate);
277 if (enc->codec_id == CODEC_ID_PCM_U8 ||
278 enc->codec_id == CODEC_ID_PCM_ALAW ||
279 enc->codec_id == CODEC_ID_PCM_MULAW) {
280 bps = 8;
281 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
282 bps = 0;
283 } 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) { //
284 bps = 4;
285 } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
286 bps = 24;
287 } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
288 bps = 32;
289 } else {
290 bps = 16;
291 }
292
293 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
294 blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
295 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
296 } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
297 blkalign = 1;
298 } else if (enc->block_align != 0) { /* specified by the codec */
299 blkalign = enc->block_align;
300 } else
301 blkalign = enc->channels*bps >> 3;
302 if (enc->codec_id == CODEC_ID_PCM_U8 ||
303 enc->codec_id == CODEC_ID_PCM_S24LE ||
304 enc->codec_id == CODEC_ID_PCM_S32LE ||
305 enc->codec_id == CODEC_ID_PCM_S16LE) {
306 bytespersec = enc->sample_rate * blkalign;
307 } else {
308 bytespersec = enc->bit_rate / 8;
309 }
310 put_le32(pb, bytespersec); /* bytes per second */
311 put_le16(pb, blkalign); /* block align */
312 put_le16(pb, bps); /* bits per sample */
313 if (enc->codec_id == CODEC_ID_MP3) {
314 put_le16(pb, 12); /* wav_extra_size */
315 hdrsize += 12;
316 put_le16(pb, 1); /* wID */
317 put_le32(pb, 2); /* fdwFlags */
318 put_le16(pb, 1152); /* nBlockSize */
319 put_le16(pb, 1); /* nFramesPerBlock */
320 put_le16(pb, 1393); /* nCodecDelay */
321 } else if (enc->codec_id == CODEC_ID_MP2) {
322 put_le16(pb, 22); /* wav_extra_size */
323 hdrsize += 22;
324 put_le16(pb, 2); /* fwHeadLayer */
325 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
326 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
327 put_le16(pb, 0); /* fwHeadModeExt */
328 put_le16(pb, 1); /* wHeadEmphasis */
329 put_le16(pb, 16); /* fwHeadFlags */
330 put_le32(pb, 0); /* dwPTSLow */
331 put_le32(pb, 0); /* dwPTSHigh */
332 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
333 put_le16(pb, 2); /* wav_extra_size */
334 hdrsize += 2;
335 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
336 } else if(enc->extradata_size){
337 put_le16(pb, enc->extradata_size);
338 put_buffer(pb, enc->extradata, enc->extradata_size);
339 hdrsize += enc->extradata_size;
340 if(hdrsize&1){
341 hdrsize++;
342 put_byte(pb, 0);
343 }
344 } else {
345 hdrsize -= 2;
346 }
347
348 return hdrsize;
349}
350
351/* BITMAPINFOHEADER header */
352void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const CodecTag *tags, int for_asf)
353{
354 put_le32(pb, 40 + enc->extradata_size); /* size */
355 put_le32(pb, enc->width);
356 put_le32(pb, enc->height);
357 put_le16(pb, 1); /* planes */
358
359 put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
360 /* compression type */
361 put_le32(pb, for_asf ? (enc->codec_tag ? enc->codec_tag : codec_get_asf_tag(tags, enc->codec_id)) : enc->codec_tag); //
362 put_le32(pb, enc->width * enc->height * 3);
363 put_le32(pb, 0);
364 put_le32(pb, 0);
365 put_le32(pb, 0);
366 put_le32(pb, 0);
367
368 put_buffer(pb, enc->extradata, enc->extradata_size);
369
370 if (enc->extradata_size & 1)
371 put_byte(pb, 0);
372}
373#endif //CONFIG_MUXERS
374
375#ifdef CONFIG_DEMUXERS
376/* We could be given one of the three possible structures here:
377 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
378 * is an expansion of the previous one with the fields added
379 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
380 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
381 * an openended structure.
382 */
383void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
384{
385 int id;
386
387 id = get_le16(pb);
388 codec->codec_type = CODEC_TYPE_AUDIO;
389 codec->codec_tag = id;
390 codec->channels = get_le16(pb);
391 codec->sample_rate = get_le32(pb);
392 codec->bit_rate = get_le32(pb) * 8;
393 codec->block_align = get_le16(pb);
394 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
395 codec->bits_per_sample = 8;
396 }else
397 codec->bits_per_sample = get_le16(pb);
398 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
399
400 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
401 codec->extradata_size = get_le16(pb);
402 if (codec->extradata_size > 0) {
403 if (codec->extradata_size > size - 18)
404 codec->extradata_size = size - 18;
405 codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
406 get_buffer(pb, codec->extradata, codec->extradata_size);
407 } else
408 codec->extradata_size = 0;
409
410 /* It is possible for the chunk to contain garbage at the end */
411 if (size - codec->extradata_size - 18 > 0)
412 url_fskip(pb, size - codec->extradata_size - 18);
413 }
414}
415
416
417int wav_codec_get_id(unsigned int tag, int bps)
418{
419 int id;
420 id = codec_get_id(codec_wav_tags, tag);
421 if (id <= 0)
422 return id;
423 /* handle specific u8 codec */
424 if (id == CODEC_ID_PCM_S16LE && bps == 8)
425 id = CODEC_ID_PCM_U8;
426 if (id == CODEC_ID_PCM_S16LE && bps == 24)
427 id = CODEC_ID_PCM_S24LE;
428 if (id == CODEC_ID_PCM_S16LE && bps == 32)
429 id = CODEC_ID_PCM_S32LE;
430 return id;
431}
432#endif // CONFIG_DEMUXERS
433
434void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
435{
436 int gcd;
437
438 *au_ssize= stream->block_align;
439 if(stream->frame_size && stream->sample_rate){
440 *au_scale=stream->frame_size;
441 *au_rate= stream->sample_rate;
442 }else if(stream->codec_type == CODEC_TYPE_VIDEO){
443 *au_scale= stream->time_base.num;
444 *au_rate = stream->time_base.den;
445 }else{
446 *au_scale= stream->block_align ? stream->block_align*8 : 8;
447 *au_rate = stream->bit_rate;
448 }
449 gcd= ff_gcd(*au_scale, *au_rate);
450 *au_scale /= gcd;
451 *au_rate /= gcd;
452}