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 "libavcodec/avcodec.h"
  23 #include "avformat.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     { CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
  36     { CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },
  37     { CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */
  38     { CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },
  39     { CODEC_ID_H263P,        MKTAG('U', '2', '6', '3') },
  40     { CODEC_ID_H263P,        MKTAG('v', 'i', 'v', '1') },
  41     { CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },
  42     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },
  43     { CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },
  44     { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },
  45     { CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },
  46     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },
  47     { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */
  48     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },
  49     { CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },
  50     { CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },
  51     { CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },
  52     { CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },
  53     { CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
  54     { CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
  55     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
  56     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
  57     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },
  58     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },
  59     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },
  60     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },
  61     { CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },
  62     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },
  63     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },
  64     { CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },
  65     { CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },
  66     { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },
  67     { CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },
  68     { CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },
  69     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },
  70     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },
  71     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },
  72     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },
  73     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
  74     { CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
  75     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },
  76     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },
  77     { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },
  78     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
  79     { CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
  80     { CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
  81     { CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
  82     { CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
  83     { CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },
  84     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },
  85     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },
  86     { CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },
  87     { CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },
  88     { CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
  89     { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
  90     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
  91     { CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },
  92     { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },
  93     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'R', 'n') },
  94     { CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },
  95     { CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },
  96     { CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },
  97     { CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },
  98     { CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },
  99     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },
 100     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },
 101     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },
 102     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },
 103     { CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },
 104     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },
 105     { CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },
 106     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },
 107     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },
 108     { CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },
 109     { CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },
 110     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },
 111     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },
 112     { CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },
 113     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },
 114     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },
 115     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },
 116     { CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },
 117     { CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },
 118     { CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },
 119     { CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },
 120     { CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },
 121     { CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },
 122     { CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },
 123     { CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },
 124     { CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },
 125     { CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },
 126     { CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },
 127     { CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },
 128     { CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },
 129     { CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },
 130     { CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },
 131     { CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },
 132     { CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },
 133     { CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },
 134     { CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },
 135     { CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },
 136     { CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },
 137     { CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },
 138     { CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },
 139     { CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },
 140     { CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },
 141     { CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },
 142     { CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },
 143     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },
 144     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },
 145     { CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },
 146     { CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },
 147     { CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },
 148     { CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },
 149     { CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },
 150     { CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },
 151     { CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },
 152     { CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },
 153     { CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },
 154     { CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },
 155     { CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },
 156     { CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },
 157     { CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },
 158     { CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },
 159     { CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },
 160     { CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },
 161     { CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },
 162     { CODEC_ID_CLJR,         MKTAG('c', 'l', 'j', 'r') },
 163     { CODEC_ID_NONE,         0 }
 164 };
 165
 166 const AVCodecTag codec_wav_tags[] = {
 167     { CODEC_ID_PCM_S16LE,       0x0001 },
 168     { CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */
 169     { CODEC_ID_PCM_S24LE,       0x0001 },
 170     { CODEC_ID_PCM_S32LE,       0x0001 },
 171     { CODEC_ID_ADPCM_MS,        0x0002 },
 172     { CODEC_ID_PCM_ALAW,        0x0006 },
 173     { CODEC_ID_PCM_MULAW,       0x0007 },
 174     { CODEC_ID_WMAVOICE,        0x000A },
 175     { CODEC_ID_ADPCM_IMA_WAV,   0x0011 },
 176     { CODEC_ID_ADPCM_YAMAHA,    0x0020 },
 177     { CODEC_ID_TRUESPEECH,      0x0022 },
 178     { CODEC_ID_GSM_MS,          0x0031 },
 179     { CODEC_ID_ADPCM_G726,      0x0045 },
 180     { CODEC_ID_MP2,             0x0050 },
 181     { CODEC_ID_MP3,             0x0055 },
 182     { CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */
 183     { CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */
 184     { CODEC_ID_VOXWARE,         0x0075 },
 185     { CODEC_ID_AAC,             0x00ff },
 186     { CODEC_ID_WMAV1,           0x0160 },
 187     { CODEC_ID_WMAV2,           0x0161 },
 188     { CODEC_ID_WMAPRO,          0x0162 },
 189     { CODEC_ID_WMALOSSLESS,     0x0163 },
 190     { CODEC_ID_ADPCM_CT,        0x0200 },
 191     { CODEC_ID_ATRAC3,          0x0270 },
 192     { CODEC_ID_IMC,             0x0401 },
 193     { CODEC_ID_AC3,             0x2000 },
 194     { CODEC_ID_DTS,             0x2001 },
 195     { CODEC_ID_SONIC,           0x2048 },
 196     { CODEC_ID_SONIC_LS,        0x2048 },
 197     { CODEC_ID_AAC,             0x706d },
 198     { CODEC_ID_FLAC,            0xF1AC },
 199     { CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },
 200     { CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
 201
 202     /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
 203     // for NuppelVideo (nuv.c)
 204     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
 205     { CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
 206     { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
 207     { 0, 0 },
 208 };
 209
 210 #ifdef CONFIG_MUXERS
 211 offset_t start_tag(ByteIOContext *pb, const char *tag)
 212 {
 213     put_tag(pb, tag);
 214     put_le32(pb, 0);
 215     return url_ftell(pb);
 216 }
 217
 218 void end_tag(ByteIOContext *pb, offset_t start)
 219 {
 220     offset_t pos;
 221
 222     pos = url_ftell(pb);
 223     url_fseek(pb, start - 4, SEEK_SET);
 224     put_le32(pb, (uint32_t)(pos - start));
 225     url_fseek(pb, pos, SEEK_SET);
 226 }
 227
 228 /* WAVEFORMATEX header */
 229 /* returns the size or -1 on error */
 230 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
 231 {
 232     int bps, blkalign, bytespersec;
 233     int hdrsize = 18;
 234
 235     if(!enc->codec_tag || enc->codec_tag > 0xffff)
 236         return -1;
 237
 238     put_le16(pb, enc->codec_tag);
 239     put_le16(pb, enc->channels);
 240     put_le32(pb, enc->sample_rate);
 241     if (enc->codec_id == CODEC_ID_PCM_U8 ||
 242         enc->codec_id == CODEC_ID_PCM_ALAW ||
 243         enc->codec_id == CODEC_ID_PCM_MULAW) {
 244         bps = 8;
 245     } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
 246         bps = 0;
 247     } 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) { //
 248         bps = 4;
 249     } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
 250         bps = 24;
 251     } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
 252         bps = 32;
 253     } else {
 254         bps = 16;
 255     }
 256     if(bps != enc->bits_per_sample && enc->bits_per_sample){
 257         av_log(enc, AV_LOG_WARNING, "requested bits_per_sample (%d) and actually stored (%d) differ\n", enc->bits_per_sample, bps);
 258     }
 259
 260     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS || enc->codec_id == CODEC_ID_AC3) {
 261         blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
 262         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
 263     } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
 264         blkalign = 1;
 265     } else if (enc->block_align != 0) { /* specified by the codec */
 266         blkalign = enc->block_align;
 267     } else
 268         blkalign = enc->channels*bps >> 3;
 269     if (enc->codec_id == CODEC_ID_PCM_U8 ||
 270         enc->codec_id == CODEC_ID_PCM_S24LE ||
 271         enc->codec_id == CODEC_ID_PCM_S32LE ||
 272         enc->codec_id == CODEC_ID_PCM_S16LE) {
 273         bytespersec = enc->sample_rate * blkalign;
 274     } else {
 275         bytespersec = enc->bit_rate / 8;
 276     }
 277     put_le32(pb, bytespersec); /* bytes per second */
 278     put_le16(pb, blkalign); /* block align */
 279     put_le16(pb, bps); /* bits per sample */
 280     if (enc->codec_id == CODEC_ID_MP3) {
 281         put_le16(pb, 12); /* wav_extra_size */
 282         hdrsize += 12;
 283         put_le16(pb, 1); /* wID */
 284         put_le32(pb, 2); /* fdwFlags */
 285         put_le16(pb, 1152); /* nBlockSize */
 286         put_le16(pb, 1); /* nFramesPerBlock */
 287         put_le16(pb, 1393); /* nCodecDelay */
 288     } else if (enc->codec_id == CODEC_ID_MP2) {
 289         put_le16(pb, 22); /* wav_extra_size */
 290         hdrsize += 22;
 291         put_le16(pb, 2);  /* fwHeadLayer */
 292         put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
 293         put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
 294         put_le16(pb, 0);  /* fwHeadModeExt */
 295         put_le16(pb, 1);  /* wHeadEmphasis */
 296         put_le16(pb, 16); /* fwHeadFlags */
 297         put_le32(pb, 0);  /* dwPTSLow */
 298         put_le32(pb, 0);  /* dwPTSHigh */
 299     } else if (enc->codec_id == CODEC_ID_GSM_MS) {
 300         put_le16(pb, 2); /* wav_extra_size */
 301         hdrsize += 2;
 302         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
 303     } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
 304         put_le16(pb, 2); /* wav_extra_size */
 305         hdrsize += 2;
 306         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
 307     } else if(enc->extradata_size){
 308         put_le16(pb, enc->extradata_size);
 309         put_buffer(pb, enc->extradata, enc->extradata_size);
 310         hdrsize += enc->extradata_size;
 311         if(hdrsize&1){
 312             hdrsize++;
 313             put_byte(pb, 0);
 314         }
 315     } else {
 316         hdrsize -= 2;
 317     }
 318
 319     return hdrsize;
 320 }
 321
 322 /* BITMAPINFOHEADER header */
 323 void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
 324 {
 325     put_le32(pb, 40 + enc->extradata_size); /* size */
 326     put_le32(pb, enc->width);
 327     put_le32(pb, enc->height);
 328     put_le16(pb, 1); /* planes */
 329
 330     put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
 331     /* compression type */
 332     put_le32(pb, enc->codec_tag);
 333     put_le32(pb, enc->width * enc->height * 3);
 334     put_le32(pb, 0);
 335     put_le32(pb, 0);
 336     put_le32(pb, 0);
 337     put_le32(pb, 0);
 338
 339     put_buffer(pb, enc->extradata, enc->extradata_size);
 340
 341     if (enc->extradata_size & 1)
 342         put_byte(pb, 0);
 343 }
 344 #endif //CONFIG_MUXERS
 345
 346 #ifdef CONFIG_DEMUXERS
 347 /* We could be given one of the three possible structures here:
 348  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
 349  * is an expansion of the previous one with the fields added
 350  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
 351  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
 352  * an openended structure.
 353  */
 354 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
 355 {
 356     int id;
 357
 358     id = get_le16(pb);
 359     codec->codec_type = CODEC_TYPE_AUDIO;
 360     codec->codec_tag = id;
 361     codec->channels = get_le16(pb);
 362     codec->sample_rate = get_le32(pb);
 363     codec->bit_rate = get_le32(pb) * 8;
 364     codec->block_align = get_le16(pb);
 365     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
 366         codec->bits_per_sample = 8;
 367     }else
 368         codec->bits_per_sample = get_le16(pb);
 369     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
 370         int cbSize = get_le16(pb); /* cbSize */
 371         size -= 18;
 372         cbSize = FFMIN(size, cbSize);
 373         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
 374             codec->bits_per_sample = get_le16(pb);
 375             get_le32(pb); /* dwChannelMask */
 376             id = get_le32(pb); /* 4 first bytes of GUID */
 377             url_fskip(pb, 12); /* skip end of GUID */
 378             cbSize -= 22;
 379             size -= 22;
 380         }
 381         codec->extradata_size = cbSize;
 382         if (cbSize > 0) {
 383             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 384             get_buffer(pb, codec->extradata, codec->extradata_size);
 385             size -= cbSize;
 386         }
 387
 388         /* It is possible for the chunk to contain garbage at the end */
 389         if (size > 0)
 390             url_fskip(pb, size);
 391     }
 392     codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
 393 }
 394
 395
 396 int wav_codec_get_id(unsigned int tag, int bps)
 397 {
 398     int id;
 399     id = codec_get_id(codec_wav_tags, tag);
 400     if (id <= 0)
 401         return id;
 402     /* handle specific u8 codec */
 403     if (id == CODEC_ID_PCM_S16LE && bps == 8)
 404         id = CODEC_ID_PCM_U8;
 405     if (id == CODEC_ID_PCM_S16LE && bps == 24)
 406         id = CODEC_ID_PCM_S24LE;
 407     if (id == CODEC_ID_PCM_S16LE && bps == 32)
 408         id = CODEC_ID_PCM_S32LE;
 409     if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)
 410         id = CODEC_ID_PCM_ZORK;
 411     return id;
 412 }
 413 #endif // CONFIG_DEMUXERS
 414
 415 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
 416 {
 417     int gcd;
 418
 419     *au_ssize= stream->block_align;
 420     if(stream->frame_size && stream->sample_rate){
 421         *au_scale=stream->frame_size;
 422         *au_rate= stream->sample_rate;
 423     }else if(stream->codec_type == CODEC_TYPE_VIDEO){
 424         *au_scale= stream->time_base.num;
 425         *au_rate = stream->time_base.den;
 426     }else{
 427         *au_scale= stream->block_align ? stream->block_align*8 : 8;
 428         *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
 429     }
 430     gcd= ff_gcd(*au_scale, *au_rate);
 431     *au_scale /= gcd;
 432     *au_rate /= gcd;
 433 }