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 AVCodecTag 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') },
  47     { CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0') },
  48     { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
  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') }, /* 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_DVVIDEO, MKTAG('d', 'v', '5', '0') },
  91     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
  92     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
  93     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
  94     { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
  95     { CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
  96     { CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
  97     { CODEC_ID_MPEG1VIDEO, 0x10000001 },
  98     { CODEC_ID_MPEG2VIDEO, 0x10000002 },
  99     { CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
 100     { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'M', 'E', 'S') },
 101     { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
 102     { CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
 103     { CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
 104     { CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
 105     { CODEC_ID_JPEGLS,MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
 106     { CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
 107     { CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') },
 108     { CODEC_ID_MJPEG, MKTAG('I', 'J', 'P', 'G') },
 109     { CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') },
 110     { CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
 111     { CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
 112     { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
 113     { CODEC_ID_RAWVIDEO, 0 },
 114     { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
 115     { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
 116     { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
 117     { CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
 118     { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
 119     { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
 120     { CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
 121     { CODEC_ID_RAWVIDEO, MKTAG('H', 'D', 'Y', 'C') },
 122     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
 123     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
 124     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
 125     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
 126     { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
 127     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
 128     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
 129     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
 130     { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
 131     { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
 132     { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
 133     { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
 134     { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
 135     { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
 136     { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
 137     { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
 138     { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
 139     { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
 140     { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
 141     { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
 142     { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
 143     { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
 144     { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
 145     { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
 146     { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
 147     { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
 148     { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
 149     { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
 150     { CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
 151     { CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
 152     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
 153     { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
 154     { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
 155     { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
 156     { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
 157     { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
 158     { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
 159     { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
 160     { CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
 161     { CODEC_ID_VC1, MKTAG('W', 'M', 'V', 'A') },
 162     { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
 163     { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
 164     { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
 165     { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
 166     { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
 167     { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
 168     { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
 169     { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
 170     { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
 171     { CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
 172     { CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
 173     { CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
 174     { CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
 175     { CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') },
 176     { CODEC_ID_NONE, 0 },
 177 };
 178
 179 const AVCodecTag codec_wav_tags[] = {
 180     { CODEC_ID_WMAVOICE, 0xA },
 181     { CODEC_ID_MP2, 0x50 },
 182     { CODEC_ID_MP3, 0x55 },
 183     { CODEC_ID_AC3, 0x2000 },
 184     { CODEC_ID_DTS, 0x2001 },
 185     { CODEC_ID_PCM_S16LE, 0x01 },
 186     { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
 187     { CODEC_ID_PCM_S24LE, 0x01 },
 188     { CODEC_ID_PCM_S32LE, 0x01 },
 189     { CODEC_ID_PCM_ALAW, 0x06 },
 190     { CODEC_ID_PCM_MULAW, 0x07 },
 191     { CODEC_ID_ADPCM_MS, 0x02 },
 192     { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
 193     { CODEC_ID_ADPCM_YAMAHA, 0x20 },
 194     { CODEC_ID_ADPCM_G726, 0x45 },
 195     { CODEC_ID_ADPCM_IMA_DK4, 0x61 },  /* rogue format number */
 196     { CODEC_ID_ADPCM_IMA_DK3, 0x62 },  /* rogue format number */
 197     { CODEC_ID_WMAV1, 0x160 },
 198     { CODEC_ID_WMAV2, 0x161 },
 199     { CODEC_ID_WMAPRO, 0x162 },
 200     { CODEC_ID_AAC, 0x706d },
 201     { CODEC_ID_AAC, 0xff },
 202     { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
 203     { CODEC_ID_SONIC, 0x2048 },
 204     { CODEC_ID_SONIC_LS, 0x2048 },
 205     { CODEC_ID_ADPCM_CT, 0x200 },
 206     { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
 207     { CODEC_ID_TRUESPEECH, 0x22 },
 208     { CODEC_ID_FLAC, 0xF1AC },
 209     { CODEC_ID_IMC, 0x401 },
 210     { CODEC_ID_GSM_MS, 0x31 },
 211     { CODEC_ID_ATRAC3, 0x270 },
 212     { CODEC_ID_VOXWARE, 0x75 },
 213
 214     /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
 215     // for NuppelVideo (nuv.c)
 216     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
 217     { CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
 218     { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
 219     { 0, 0 },
 220 };
 221
 222 #ifdef CONFIG_MUXERS
 223 offset_t start_tag(ByteIOContext *pb, const char *tag)
 224 {
 225     put_tag(pb, tag);
 226     put_le32(pb, 0);
 227     return url_ftell(pb);
 228 }
 229
 230 void end_tag(ByteIOContext *pb, offset_t start)
 231 {
 232     offset_t pos;
 233
 234     pos = url_ftell(pb);
 235     url_fseek(pb, start - 4, SEEK_SET);
 236     put_le32(pb, (uint32_t)(pos - start));
 237     url_fseek(pb, pos, SEEK_SET);
 238 }
 239
 240 /* WAVEFORMATEX header */
 241 /* returns the size or -1 on error */
 242 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
 243 {
 244     int bps, blkalign, bytespersec;
 245     int hdrsize = 18;
 246
 247     if(!enc->codec_tag || enc->codec_tag > 0xffff)
 248         return -1;
 249
 250     put_le16(pb, enc->codec_tag);
 251     put_le16(pb, enc->channels);
 252     put_le32(pb, enc->sample_rate);
 253     if (enc->codec_id == CODEC_ID_PCM_U8 ||
 254         enc->codec_id == CODEC_ID_PCM_ALAW ||
 255         enc->codec_id == CODEC_ID_PCM_MULAW) {
 256         bps = 8;
 257     } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
 258         bps = 0;
 259     } 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) { //
 260         bps = 4;
 261     } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
 262         bps = 24;
 263     } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
 264         bps = 32;
 265     } else {
 266         bps = 16;
 267     }
 268     if(bps != enc->bits_per_sample && enc->bits_per_sample){
 269         av_log(enc, AV_LOG_WARNING, "requested bits_per_sample (%d) and actually stored (%d) differ\n", enc->bits_per_sample, bps);
 270     }
 271
 272     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
 273         blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
 274         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
 275     } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
 276         blkalign = 1;
 277     } else if (enc->block_align != 0) { /* specified by the codec */
 278         blkalign = enc->block_align;
 279     } else
 280         blkalign = enc->channels*bps >> 3;
 281     if (enc->codec_id == CODEC_ID_PCM_U8 ||
 282         enc->codec_id == CODEC_ID_PCM_S24LE ||
 283         enc->codec_id == CODEC_ID_PCM_S32LE ||
 284         enc->codec_id == CODEC_ID_PCM_S16LE) {
 285         bytespersec = enc->sample_rate * blkalign;
 286     } else {
 287         bytespersec = enc->bit_rate / 8;
 288     }
 289     put_le32(pb, bytespersec); /* bytes per second */
 290     put_le16(pb, blkalign); /* block align */
 291     put_le16(pb, bps); /* bits per sample */
 292     if (enc->codec_id == CODEC_ID_MP3) {
 293         put_le16(pb, 12); /* wav_extra_size */
 294         hdrsize += 12;
 295         put_le16(pb, 1); /* wID */
 296         put_le32(pb, 2); /* fdwFlags */
 297         put_le16(pb, 1152); /* nBlockSize */
 298         put_le16(pb, 1); /* nFramesPerBlock */
 299         put_le16(pb, 1393); /* nCodecDelay */
 300     } else if (enc->codec_id == CODEC_ID_MP2) {
 301         put_le16(pb, 22); /* wav_extra_size */
 302         hdrsize += 22;
 303         put_le16(pb, 2);  /* fwHeadLayer */
 304         put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
 305         put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
 306         put_le16(pb, 0);  /* fwHeadModeExt */
 307         put_le16(pb, 1);  /* wHeadEmphasis */
 308         put_le16(pb, 16); /* fwHeadFlags */
 309         put_le32(pb, 0);  /* dwPTSLow */
 310         put_le32(pb, 0);  /* dwPTSHigh */
 311     } else if (enc->codec_id == CODEC_ID_GSM_MS) {
 312         put_le16(pb, 2); /* wav_extra_size */
 313         hdrsize += 2;
 314         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
 315     } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
 316         put_le16(pb, 2); /* wav_extra_size */
 317         hdrsize += 2;
 318         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
 319     } else if(enc->extradata_size){
 320         put_le16(pb, enc->extradata_size);
 321         put_buffer(pb, enc->extradata, enc->extradata_size);
 322         hdrsize += enc->extradata_size;
 323         if(hdrsize&1){
 324             hdrsize++;
 325             put_byte(pb, 0);
 326         }
 327     } else {
 328         hdrsize -= 2;
 329     }
 330
 331     return hdrsize;
 332 }
 333
 334 /* BITMAPINFOHEADER header */
 335 void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
 336 {
 337     put_le32(pb, 40 + enc->extradata_size); /* size */
 338     put_le32(pb, enc->width);
 339     put_le32(pb, enc->height);
 340     put_le16(pb, 1); /* planes */
 341
 342     put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
 343     /* compression type */
 344     put_le32(pb, enc->codec_tag);
 345     put_le32(pb, enc->width * enc->height * 3);
 346     put_le32(pb, 0);
 347     put_le32(pb, 0);
 348     put_le32(pb, 0);
 349     put_le32(pb, 0);
 350
 351     put_buffer(pb, enc->extradata, enc->extradata_size);
 352
 353     if (enc->extradata_size & 1)
 354         put_byte(pb, 0);
 355 }
 356 #endif //CONFIG_MUXERS
 357
 358 #ifdef CONFIG_DEMUXERS
 359 /* We could be given one of the three possible structures here:
 360  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
 361  * is an expansion of the previous one with the fields added
 362  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
 363  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
 364  * an openended structure.
 365  */
 366 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
 367 {
 368     int id;
 369
 370     id = get_le16(pb);
 371     codec->codec_type = CODEC_TYPE_AUDIO;
 372     codec->codec_tag = id;
 373     codec->channels = get_le16(pb);
 374     codec->sample_rate = get_le32(pb);
 375     codec->bit_rate = get_le32(pb) * 8;
 376     codec->block_align = get_le16(pb);
 377     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
 378         codec->bits_per_sample = 8;
 379     }else
 380         codec->bits_per_sample = get_le16(pb);
 381     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
 382         int cbSize = get_le16(pb); /* cbSize */
 383         size -= 18;
 384         cbSize = FFMIN(size, cbSize);
 385         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
 386             codec->bits_per_sample = get_le16(pb);
 387             get_le32(pb); /* dwChannelMask */
 388             id = get_le32(pb); /* 4 first bytes of GUID */
 389             url_fskip(pb, 12); /* skip end of GUID */
 390             cbSize -= 22;
 391             size -= 22;
 392         }
 393         codec->extradata_size = cbSize;
 394         if (cbSize > 0) {
 395             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 396             get_buffer(pb, codec->extradata, codec->extradata_size);
 397             size -= cbSize;
 398         }
 399
 400         /* It is possible for the chunk to contain garbage at the end */
 401         if (size > 0)
 402             url_fskip(pb, size);
 403     }
 404     codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
 405 }
 406
 407
 408 int wav_codec_get_id(unsigned int tag, int bps)
 409 {
 410     int id;
 411     id = codec_get_id(codec_wav_tags, tag);
 412     if (id <= 0)
 413         return id;
 414     /* handle specific u8 codec */
 415     if (id == CODEC_ID_PCM_S16LE && bps == 8)
 416         id = CODEC_ID_PCM_U8;
 417     if (id == CODEC_ID_PCM_S16LE && bps == 24)
 418         id = CODEC_ID_PCM_S24LE;
 419     if (id == CODEC_ID_PCM_S16LE && bps == 32)
 420         id = CODEC_ID_PCM_S32LE;
 421     if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)
 422         id = CODEC_ID_PCM_ZORK;
 423     return id;
 424 }
 425 #endif // CONFIG_DEMUXERS
 426
 427 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
 428 {
 429     int gcd;
 430
 431     *au_ssize= stream->block_align;
 432     if(stream->frame_size && stream->sample_rate){
 433         *au_scale=stream->frame_size;
 434         *au_rate= stream->sample_rate;
 435     }else if(stream->codec_type == CODEC_TYPE_VIDEO){
 436         *au_scale= stream->time_base.num;
 437         *au_rate = stream->time_base.den;
 438     }else{
 439         *au_scale= stream->block_align ? stream->block_align*8 : 8;
 440         *au_rate = stream->bit_rate;
 441     }
 442     gcd= ff_gcd(*au_scale, *au_rate);
 443     *au_scale /= gcd;
 444     *au_rate /= gcd;
 445 }