MythTV: riff.c Source File

00001 /*
00002  * RIFF codec tags
00003  * Copyright (c) 2000 Fabrice Bellard.
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avformat.h"
00023 #include "avcodec.h"
00024 #include "riff.h"
00025 
00026 /* Note: when encoding, the first matching tag is used, so order is
00027    important if multiple tags possible for a given codec. */
00028 const AVCodecTag codec_bmp_tags[] = {
00029     { CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
00030     { CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
00031     { CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
00032     { CODEC_ID_H264, MKTAG('x', '2', '6', '4') },
00033     { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') },
00034     { CODEC_ID_H264, MKTAG('V', 'S', 'S', 'H') },
00035 
00036     { CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
00037     { CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
00038     { CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
00039     { CODEC_ID_H261, MKTAG('H', '2', '6', '1') },
00040 
00041     /* added based on MPlayer */
00042     { CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
00043     { CODEC_ID_H263P, MKTAG('v', 'i', 'v', '1') },
00044 
00045     { CODEC_ID_MPEG4, MKTAG('F', 'M', 'P', '4') },
00046     { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') },
00047     { CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0') },
00048     { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
00049     { CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
00050     { CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
00051     { CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
00052 
00053     /* added based on MPlayer */
00054     { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
00055     { CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
00056     { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
00057     { CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
00058     { CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
00059     { CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },
00060 
00061     { CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },
00062 
00063     { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
00064     { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
00065 
00066     /* added based on MPlayer */
00067     { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
00068     { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
00069     { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
00070     { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
00071     { CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
00072     { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
00073     { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },
00074 
00075     { CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
00076 
00077     /* added based on MPlayer */
00078     { CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },
00079 
00080     { CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },
00081 
00082     { CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },
00083 
00084     /* added based on MPlayer */
00085     { CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
00086     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
00087     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
00088     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
00089     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
00090     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
00091     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
00092     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
00093     { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
00094     { CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
00095     { CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
00096     { CODEC_ID_MPEG1VIDEO, 0x10000001 },
00097     { CODEC_ID_MPEG2VIDEO, 0x10000002 },
00098     { CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
00099     { CODEC_ID_MPEG2VIDEO, MKTAG('M', 'M', 'E', 'S') },
00100     { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
00101     { CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
00102     { CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
00103     { CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
00104     { CODEC_ID_JPEGLS,MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
00105     { CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
00106     { CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') },
00107     { CODEC_ID_MJPEG, MKTAG('I', 'J', 'P', 'G') },
00108     { CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') },
00109     { CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
00110     { CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
00111     { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
00112     { CODEC_ID_RAWVIDEO, 0 },
00113     { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
00114     { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
00115     { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
00116     { CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
00117     { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
00118     { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
00119     { CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
00120     { CODEC_ID_RAWVIDEO, MKTAG('H', 'D', 'Y', 'C') },
00121     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
00122     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
00123     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
00124     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
00125     { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
00126     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
00127     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
00128     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
00129     { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
00130     { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
00131     { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
00132     { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
00133     { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
00134     { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
00135     { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
00136     { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
00137     { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
00138     { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
00139     { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
00140     { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
00141     { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
00142     { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
00143     { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
00144     { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
00145     { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
00146     { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
00147     { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
00148     { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
00149     { CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
00150     { CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
00151     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
00152     { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
00153     { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
00154     { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
00155     { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
00156     { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
00157     { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
00158     { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
00159     { CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
00160     { CODEC_ID_VC1, MKTAG('W', 'M', 'V', 'A') },
00161     { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
00162     { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
00163     { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
00164     { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
00165     { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
00166     { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
00167     { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
00168     { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
00169     { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
00170     { CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
00171     { CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
00172     { CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
00173     { CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
00174     { CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') },
00175     { CODEC_ID_NONE, 0 },
00176 };
00177 
00178 const AVCodecTag codec_wav_tags[] = {
00179     { CODEC_ID_MP2, 0x50 },
00180     { CODEC_ID_MP3, 0x55 },
00181     { CODEC_ID_AC3, 0x2000 },
00182     { CODEC_ID_DTS, 0x2001 },
00183     { CODEC_ID_PCM_S16LE, 0x01 },
00184     { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
00185     { CODEC_ID_PCM_S24LE, 0x01 },
00186     { CODEC_ID_PCM_S32LE, 0x01 },
00187     { CODEC_ID_PCM_ALAW, 0x06 },
00188     { CODEC_ID_PCM_MULAW, 0x07 },
00189     { CODEC_ID_ADPCM_MS, 0x02 },
00190     { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
00191     { CODEC_ID_ADPCM_YAMAHA, 0x20 },
00192     { CODEC_ID_ADPCM_G726, 0x45 },
00193     { CODEC_ID_ADPCM_IMA_DK4, 0x61 },  /* rogue format number */
00194     { CODEC_ID_ADPCM_IMA_DK3, 0x62 },  /* rogue format number */
00195     { CODEC_ID_WMAV1, 0x160 },
00196     { CODEC_ID_WMAV2, 0x161 },
00197     { CODEC_ID_AAC, 0x706d },
00198     { CODEC_ID_AAC, 0xff },
00199     { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
00200     { CODEC_ID_SONIC, 0x2048 },
00201     { CODEC_ID_SONIC_LS, 0x2048 },
00202     { CODEC_ID_ADPCM_CT, 0x200 },
00203     { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
00204     { CODEC_ID_TRUESPEECH, 0x22 },
00205     { CODEC_ID_FLAC, 0xF1AC },
00206     { CODEC_ID_IMC, 0x401 },
00207     { CODEC_ID_GSM_MS, 0x31 },
00208     { CODEC_ID_ATRAC3, 0x270 },
00209     { CODEC_ID_VOXWARE, 0x75 },
00210 
00211     /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
00212     // for NuppelVideo (nuv.c)
00213     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
00214     { CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
00215     { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
00216     { 0, 0 },
00217 };
00218 
00219 #ifdef CONFIG_MUXERS
00220 offset_t start_tag(ByteIOContext *pb, const char *tag)
00221 {
00222     put_tag(pb, tag);
00223     put_le32(pb, 0);
00224     return url_ftell(pb);
00225 }
00226 
00227 void end_tag(ByteIOContext *pb, offset_t start)
00228 {
00229     offset_t pos;
00230 
00231     pos = url_ftell(pb);
00232     url_fseek(pb, start - 4, SEEK_SET);
00233     put_le32(pb, (uint32_t)(pos - start));
00234     url_fseek(pb, pos, SEEK_SET);
00235 }
00236 
00237 /* WAVEFORMATEX header */
00238 /* returns the size or -1 on error */
00239 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
00240 {
00241     int bps, blkalign, bytespersec;
00242     int hdrsize = 18;
00243 
00244     if(!enc->codec_tag || enc->codec_tag > 0xffff)
00245         return -1;
00246 
00247     put_le16(pb, enc->codec_tag);
00248     put_le16(pb, enc->channels);
00249     put_le32(pb, enc->sample_rate);
00250     if (enc->codec_id == CODEC_ID_PCM_U8 ||
00251         enc->codec_id == CODEC_ID_PCM_ALAW ||
00252         enc->codec_id == CODEC_ID_PCM_MULAW) {
00253         bps = 8;
00254     } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
00255         bps = 0;
00256     } 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) { //
00257         bps = 4;
00258     } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
00259         bps = 24;
00260     } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
00261         bps = 32;
00262     } else {
00263         bps = 16;
00264     }
00265     if(bps != enc->bits_per_sample && enc->bits_per_sample){
00266         av_log(enc, AV_LOG_WARNING, "requested bits_per_sample (%d) and actually stored (%d) differ\n", enc->bits_per_sample, bps);
00267     }
00268 
00269     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
00270         blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
00271         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
00272     } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
00273         blkalign = 1;
00274     } else if (enc->block_align != 0) { /* specified by the codec */
00275         blkalign = enc->block_align;
00276     } else
00277         blkalign = enc->channels*bps >> 3;
00278     if (enc->codec_id == CODEC_ID_PCM_U8 ||
00279         enc->codec_id == CODEC_ID_PCM_S24LE ||
00280         enc->codec_id == CODEC_ID_PCM_S32LE ||
00281         enc->codec_id == CODEC_ID_PCM_S16LE) {
00282         bytespersec = enc->sample_rate * blkalign;
00283     } else {
00284         bytespersec = enc->bit_rate / 8;
00285     }
00286     put_le32(pb, bytespersec); /* bytes per second */
00287     put_le16(pb, blkalign); /* block align */
00288     put_le16(pb, bps); /* bits per sample */
00289     if (enc->codec_id == CODEC_ID_MP3) {
00290         put_le16(pb, 12); /* wav_extra_size */
00291         hdrsize += 12;
00292         put_le16(pb, 1); /* wID */
00293         put_le32(pb, 2); /* fdwFlags */
00294         put_le16(pb, 1152); /* nBlockSize */
00295         put_le16(pb, 1); /* nFramesPerBlock */
00296         put_le16(pb, 1393); /* nCodecDelay */
00297     } else if (enc->codec_id == CODEC_ID_MP2) {
00298         put_le16(pb, 22); /* wav_extra_size */
00299         hdrsize += 22;
00300         put_le16(pb, 2);  /* fwHeadLayer */
00301         put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
00302         put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
00303         put_le16(pb, 0);  /* fwHeadModeExt */
00304         put_le16(pb, 1);  /* wHeadEmphasis */
00305         put_le16(pb, 16); /* fwHeadFlags */
00306         put_le32(pb, 0);  /* dwPTSLow */
00307         put_le32(pb, 0);  /* dwPTSHigh */
00308     } else if (enc->codec_id == CODEC_ID_GSM_MS) {
00309         put_le16(pb, 2); /* wav_extra_size */
00310         hdrsize += 2;
00311         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
00312     } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
00313         put_le16(pb, 2); /* wav_extra_size */
00314         hdrsize += 2;
00315         put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
00316     } else if(enc->extradata_size){
00317         put_le16(pb, enc->extradata_size);
00318         put_buffer(pb, enc->extradata, enc->extradata_size);
00319         hdrsize += enc->extradata_size;
00320         if(hdrsize&1){
00321             hdrsize++;
00322             put_byte(pb, 0);
00323         }
00324     } else {
00325         hdrsize -= 2;
00326     }
00327 
00328     return hdrsize;
00329 }
00330 
00331 /* BITMAPINFOHEADER header */
00332 void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
00333 {
00334     put_le32(pb, 40 + enc->extradata_size); /* size */
00335     put_le32(pb, enc->width);
00336     put_le32(pb, enc->height);
00337     put_le16(pb, 1); /* planes */
00338 
00339     put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
00340     /* compression type */
00341     put_le32(pb, enc->codec_tag);
00342     put_le32(pb, enc->width * enc->height * 3);
00343     put_le32(pb, 0);
00344     put_le32(pb, 0);
00345     put_le32(pb, 0);
00346     put_le32(pb, 0);
00347 
00348     put_buffer(pb, enc->extradata, enc->extradata_size);
00349 
00350     if (enc->extradata_size & 1)
00351         put_byte(pb, 0);
00352 }
00353 #endif //CONFIG_MUXERS
00354 
00355 #ifdef CONFIG_DEMUXERS
00356 /* We could be given one of the three possible structures here:
00357  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
00358  * is an expansion of the previous one with the fields added
00359  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
00360  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
00361  * an openended structure.
00362  */
00363 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
00364 {
00365     int id;
00366 
00367     id = get_le16(pb);
00368     codec->codec_type = CODEC_TYPE_AUDIO;
00369     codec->codec_tag = id;
00370     codec->channels = get_le16(pb);
00371     codec->sample_rate = get_le32(pb);
00372     codec->bit_rate = get_le32(pb) * 8;
00373     codec->block_align = get_le16(pb);
00374     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
00375         codec->bits_per_sample = 8;
00376     }else
00377         codec->bits_per_sample = get_le16(pb);
00378     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
00379         int cbSize = get_le16(pb); /* cbSize */
00380         size -= 18;
00381         cbSize = FFMIN(size, cbSize);
00382         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
00383             codec->bits_per_sample = get_le16(pb);
00384             get_le32(pb); /* dwChannelMask */
00385             id = get_le32(pb); /* 4 first bytes of GUID */
00386             url_fskip(pb, 12); /* skip end of GUID */
00387             cbSize -= 22;
00388             size -= 22;
00389         }
00390         codec->extradata_size = cbSize;
00391         if (cbSize > 0) {
00392             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00393             get_buffer(pb, codec->extradata, codec->extradata_size);
00394             size -= cbSize;
00395         }
00396 
00397         /* It is possible for the chunk to contain garbage at the end */
00398         if (size > 0)
00399             url_fskip(pb, size);
00400     }
00401     codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
00402 }
00403 
00404 
00405 int wav_codec_get_id(unsigned int tag, int bps)
00406 {
00407     int id;
00408     id = codec_get_id(codec_wav_tags, tag);
00409     if (id <= 0)
00410         return id;
00411     /* handle specific u8 codec */
00412     if (id == CODEC_ID_PCM_S16LE && bps == 8)
00413         id = CODEC_ID_PCM_U8;
00414     if (id == CODEC_ID_PCM_S16LE && bps == 24)
00415         id = CODEC_ID_PCM_S24LE;
00416     if (id == CODEC_ID_PCM_S16LE && bps == 32)
00417         id = CODEC_ID_PCM_S32LE;
00418     if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)
00419         id = CODEC_ID_PCM_ZORK;
00420     return id;
00421 }
00422 #endif // CONFIG_DEMUXERS
00423 
00424 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
00425 {
00426     int gcd;
00427 
00428     *au_ssize= stream->block_align;
00429     if(stream->frame_size && stream->sample_rate){
00430         *au_scale=stream->frame_size;
00431         *au_rate= stream->sample_rate;
00432     }else if(stream->codec_type == CODEC_TYPE_VIDEO){
00433         *au_scale= stream->time_base.num;
00434         *au_rate = stream->time_base.den;
00435     }else{
00436         *au_scale= stream->block_align ? stream->block_align*8 : 8;
00437         *au_rate = stream->bit_rate;
00438     }
00439     gcd= ff_gcd(*au_scale, *au_rate);
00440     *au_scale /= gcd;
00441     *au_rate /= gcd;
00442 }