FFmpeg: libavformat/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 "libavutil/mathematics.h"
00023 #include "libavcodec/avcodec.h"
00024 #include "avformat.h"
00025 #include "avio_internal.h"
00026 #include "riff.h"
00027 #include "libavcodec/bytestream.h"
00028 
00029 /* Note: when encoding, the first matching tag is used, so order is
00030    important if multiple tags possible for a given codec. */
00031 const AVCodecTag ff_codec_bmp_tags[] = {
00032     { CODEC_ID_H264,         MKTAG('H', '2', '6', '4') },
00033     { CODEC_ID_H264,         MKTAG('h', '2', '6', '4') },
00034     { CODEC_ID_H264,         MKTAG('X', '2', '6', '4') },
00035     { CODEC_ID_H264,         MKTAG('x', '2', '6', '4') },
00036     { CODEC_ID_H264,         MKTAG('a', 'v', 'c', '1') },
00037     { CODEC_ID_H264,         MKTAG('D', 'A', 'V', 'C') },
00038     { CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },
00039     { CODEC_ID_H264,         MKTAG('Q', '2', '6', '4') }, /* QNAP surveillance system */
00040     { CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
00041     { CODEC_ID_H263,         MKTAG('X', '2', '6', '3') },
00042     { CODEC_ID_H263,         MKTAG('T', '2', '6', '3') },
00043     { CODEC_ID_H263,         MKTAG('L', '2', '6', '3') },
00044     { CODEC_ID_H263,         MKTAG('V', 'X', '1', 'K') },
00045     { CODEC_ID_H263,         MKTAG('Z', 'y', 'G', 'o') },
00046     { CODEC_ID_H263,         MKTAG('M', '2', '6', '3') },
00047     { CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },
00048     { CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */
00049     { CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },
00050     { CODEC_ID_H263P,        MKTAG('U', '2', '6', '3') },
00051     { CODEC_ID_H263P,        MKTAG('v', 'i', 'v', '1') },
00052     { CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },
00053     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },
00054     { CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },
00055     { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },
00056     { CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },
00057     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },
00058     { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */
00059     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },
00060     { CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },
00061     { CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },
00062     { CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },
00063     { CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },
00064     { CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
00065     { CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
00066     { CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },
00067     { CODEC_ID_MPEG4,        MKTAG('W', 'A', 'W', 'V') }, /* WaWv MPEG-4 Video Codec */
00068     { CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },
00069     { CODEC_ID_MPEG4,        MKTAG('F', 'V', 'F', 'W') },
00070     { CODEC_ID_MPEG4,        MKTAG('D', 'C', 'O', 'D') },
00071     { CODEC_ID_MPEG4,        MKTAG('M', 'V', 'X', 'M') },
00072     { CODEC_ID_MPEG4,        MKTAG('P', 'M', '4', 'V') },
00073     { CODEC_ID_MPEG4,        MKTAG('S', 'M', 'P', '4') },
00074     { CODEC_ID_MPEG4,        MKTAG('D', 'X', 'G', 'M') },
00075     { CODEC_ID_MPEG4,        MKTAG('V', 'I', 'D', 'M') },
00076     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'T', '3') },
00077     { CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'X') },
00078     { CODEC_ID_MPEG4,        MKTAG('H', 'D', 'X', '4') }, /* flipped video */
00079     { CODEC_ID_MPEG4,        MKTAG('D', 'M', 'K', '2') },
00080     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'G', 'I') },
00081     { CODEC_ID_MPEG4,        MKTAG('I', 'N', 'M', 'C') },
00082     { CODEC_ID_MPEG4,        MKTAG('E', 'P', 'H', 'V') }, /* Ephv MPEG-4 */
00083     { CODEC_ID_MPEG4,        MKTAG('E', 'M', '4', 'A') },
00084     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'C', 'C') }, /* Divio MPEG-4 */
00085     { CODEC_ID_MPEG4,        MKTAG('S', 'N', '4', '0') },
00086     { CODEC_ID_MPEG4,        MKTAG('V', 'S', 'P', 'X') },
00087     { CODEC_ID_MPEG4,        MKTAG('U', 'L', 'D', 'X') },
00088     { CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'V') },
00089     { CODEC_ID_MPEG4,        MKTAG('S', 'I', 'P', 'P') }, /* Samsung SHR-6040 */
00090     { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'X') },
00091     { CODEC_ID_MPEG4,        MKTAG('D', 'r', 'e', 'X') },
00092     { CODEC_ID_MPEG4,        MKTAG('Q', 'M', 'P', '4') }, /* QNAP Systems */
00093     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
00094     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') },
00095     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },
00096     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },
00097     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },
00098     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },
00099     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'V', 'X', '3') },
00100     { CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },
00101     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },
00102     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },
00103     { CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },
00104     { CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },
00105     { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },
00106     { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', '4', '1') },
00107     { CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },
00108     { CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },
00109     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },
00110     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },
00111     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
00112     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },
00113     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },
00114     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
00115     { CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
00116     { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */
00117     { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */
00118     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', ' ') },
00119     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', 's') },
00120     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
00121     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },
00122     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },
00123     { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },
00124     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
00125     { CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
00126     { CODEC_ID_MPEG2VIDEO,   MKTAG('P', 'I', 'M', '2') },
00127     { CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
00128     { CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
00129     { CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
00130     { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  16) },
00131     { CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },
00132     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },
00133     { CODEC_ID_MPEG2VIDEO,   MKTAG('L', 'M', 'P', '2') }, /* Lead MPEG2 in avi */
00134     { CODEC_ID_MPEG2VIDEO,   MKTAG('s', 'l', 'i', 'f') },
00135     { CODEC_ID_MPEG2VIDEO,   MKTAG('E', 'M', '2', 'V') },
00136     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', '7', '0', '1') }, /* Matrox MPEG2 intra-only */
00137     { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', 'v') },
00138     { CODEC_ID_MPEG1VIDEO,   MKTAG('B', 'W', '1', '0') },
00139     { CODEC_ID_MPEG1VIDEO,   MKTAG('X', 'M', 'P', 'G') }, /* Xing MPEG intra only */
00140     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },
00141     { CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },
00142     { CODEC_ID_MJPEG,        MKTAG('d', 'm', 'b', '1') },
00143     { CODEC_ID_MJPEG,        MKTAG('m', 'j', 'p', 'a') },
00144     { CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },
00145     { CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
00146     { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
00147     { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'P', 'G') },
00148     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
00149     { CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },
00150     { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },
00151     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'R', 'n') },
00152     { CODEC_ID_MJPEG,        MKTAG('A', 'C', 'D', 'V') },
00153     { CODEC_ID_MJPEG,        MKTAG('Q', 'I', 'V', 'G') },
00154     { CODEC_ID_MJPEG,        MKTAG('S', 'L', 'M', 'J') }, /* SL M-JPEG */
00155     { CODEC_ID_MJPEG,        MKTAG('C', 'J', 'P', 'G') }, /* Creative Webcam JPEG */
00156     { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'L', 'V') }, /* Intel JPEG Library Video Codec */
00157     { CODEC_ID_MJPEG,        MKTAG('M', 'V', 'J', 'P') }, /* Midvid JPEG Video Codec */
00158     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '1') },
00159     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '2') },
00160     { CODEC_ID_MJPEG,        MKTAG('M', 'T', 'S', 'J') },
00161     { CODEC_ID_MJPEG,        MKTAG('Z', 'J', 'P', 'G') }, /* Paradigm Matrix M-JPEG Codec */
00162     { CODEC_ID_MJPEG,        MKTAG('M', 'M', 'J', 'P') },
00163     { CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },
00164     { CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },
00165     { CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },
00166     { CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },
00167     { CODEC_ID_RAWVIDEO,     MKTAG( 3 ,  0 ,  0 ,  0 ) },
00168     { CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },
00169     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },
00170     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },
00171     { CODEC_ID_RAWVIDEO,     MKTAG('V', '4', '2', '2') },
00172     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'N', 'V') },
00173     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'V') },
00174     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'Y') },
00175     { CODEC_ID_RAWVIDEO,     MKTAG('u', 'y', 'v', '1') },
00176     { CODEC_ID_RAWVIDEO,     MKTAG('2', 'V', 'u', '1') },
00177     { CODEC_ID_RAWVIDEO,     MKTAG('2', 'v', 'u', 'y') },
00178     { CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', 's') },
00179     { CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', '2') },
00180     { CODEC_ID_RAWVIDEO,     MKTAG('P', '4', '2', '2') },
00181     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },
00182     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '6') },
00183     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '2', '4') },
00184     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },
00185     { CODEC_ID_RAWVIDEO,     MKTAG('V', 'Y', 'U', 'Y') },
00186     { CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },
00187     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },
00188     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', ' ', ' ') },
00189     { CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },
00190     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
00191     { CODEC_ID_RAWVIDEO,     MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
00192     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', '1') },
00193     { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '1', '2') },
00194     { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '2', '1') },
00195     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', 'B') },
00196     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', 'B') },
00197     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'V', '9') },
00198     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
00199     { CODEC_ID_RAWVIDEO,     MKTAG('a', 'u', 'v', '2') },
00200     { CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },
00201     { CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },
00202     { CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },
00203     { CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },
00204     { CODEC_ID_V308,         MKTAG('v', '3', '0', '8') },
00205     { CODEC_ID_V410,         MKTAG('v', '4', '1', '0') },
00206     { CODEC_ID_YUV4,         MKTAG('y', 'u', 'v', '4') },
00207     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },
00208     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },
00209     { CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },
00210     { CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },
00211     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },
00212     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },
00213     { CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },
00214     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },
00215     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },
00216     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },
00217     { CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },
00218     { CODEC_ID_VP6F,         MKTAG('F', 'L', 'V', '4') },
00219     { CODEC_ID_VP8,          MKTAG('V', 'P', '8', '0') },
00220     { CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },
00221     { CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },
00222     { CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },
00223     { CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },
00224     { CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },
00225     { CODEC_ID_MIMIC,        MKTAG('L', 'M', '2', '0') },
00226     { CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },
00227     { CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },
00228     { CODEC_ID_MSRLE,        MKTAG( 2 ,  0 ,  0 ,  0 ) },
00229     { CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },
00230     { CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },
00231     { CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },
00232     { CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },
00233     { CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },
00234     { CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },
00235     { CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },
00236     { CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },
00237     { CODEC_ID_TRUEMOTION1,  MKTAG('P', 'V', 'E', 'Z') },
00238     { CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },
00239     { CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },
00240     { CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },
00241     { CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },
00242     { CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },
00243     { CODEC_ID_FLV1,         MKTAG('S', '2', '6', '3') },
00244     { CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },
00245     { CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },
00246     { CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },
00247     { CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },
00248     { CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },
00249     { CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },
00250     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },
00251     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },
00252     { CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },
00253     { CODEC_ID_WMV3IMAGE,    MKTAG('W', 'M', 'V', 'P') },
00254     { CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },
00255     { CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },
00256     { CODEC_ID_VC1IMAGE,     MKTAG('W', 'V', 'P', '2') },
00257     { CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },
00258     { CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },
00259     { CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },
00260     { CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },
00261     { CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },
00262     { CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },
00263     { CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },
00264     { CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },
00265     { CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },
00266     { CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },
00267     { CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },
00268     { CODEC_ID_JPEG2000,     MKTAG('m', 'j', 'p', '2') },
00269     { CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },
00270     { CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'C') },
00271     { CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'K') },
00272     { CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },
00273     { CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },
00274     { CODEC_ID_PNG,          MKTAG('M', 'P', 'N', 'G') },
00275     { CODEC_ID_PNG,          MKTAG('P', 'N', 'G', '1') },
00276     { CODEC_ID_CLJR,         MKTAG('C', 'L', 'J', 'R') },
00277     { CODEC_ID_DIRAC,        MKTAG('d', 'r', 'a', 'c') },
00278     { CODEC_ID_RPZA,         MKTAG('a', 'z', 'p', 'r') },
00279     { CODEC_ID_RPZA,         MKTAG('R', 'P', 'Z', 'A') },
00280     { CODEC_ID_RPZA,         MKTAG('r', 'p', 'z', 'a') },
00281     { CODEC_ID_SP5X,         MKTAG('S', 'P', '5', '4') },
00282     { CODEC_ID_AURA,         MKTAG('A', 'U', 'R', 'A') },
00283     { CODEC_ID_AURA2,        MKTAG('A', 'U', 'R', '2') },
00284     { CODEC_ID_DPX,          MKTAG('d', 'p', 'x', ' ') },
00285     { CODEC_ID_KGV1,         MKTAG('K', 'G', 'V', '1') },
00286     { CODEC_ID_LAGARITH,     MKTAG('L', 'A', 'G', 'S') },
00287     { CODEC_ID_G2M,          MKTAG('G', '2', 'M', '2') },
00288     { CODEC_ID_G2M,          MKTAG('G', '2', 'M', '3') },
00289     { CODEC_ID_G2M,          MKTAG('G', '2', 'M', '4') },
00290     { CODEC_ID_AMV,          MKTAG('A', 'M', 'V', 'F') },
00291     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'A') },
00292     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'G') },
00293     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '0') },
00294     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '2') },
00295     { CODEC_ID_VBLE,         MKTAG('V', 'B', 'L', 'E') },
00296     { CODEC_ID_ESCAPE130,    MKTAG('E', '1', '3', '0') },
00297     { CODEC_ID_DXTORY,       MKTAG('x', 't', 'o', 'r') },
00298     { CODEC_ID_Y41P,         MKTAG('Y', '4', '1', 'P') },
00299     { CODEC_ID_NONE,         0 }
00300 };
00301 
00302 const AVCodecTag ff_codec_wav_tags[] = {
00303     { CODEC_ID_PCM_S16LE,       0x0001 },
00304     { CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */
00305     { CODEC_ID_PCM_S24LE,       0x0001 },
00306     { CODEC_ID_PCM_S32LE,       0x0001 },
00307     { CODEC_ID_ADPCM_MS,        0x0002 },
00308     { CODEC_ID_PCM_F32LE,       0x0003 },
00309     { CODEC_ID_PCM_F64LE,       0x0003 }, /* must come after f32le in this list */
00310     { CODEC_ID_PCM_ALAW,        0x0006 },
00311     { CODEC_ID_PCM_MULAW,       0x0007 },
00312     { CODEC_ID_WMAVOICE,        0x000A },
00313     { CODEC_ID_ADPCM_IMA_WAV,   0x0011 },
00314     { CODEC_ID_PCM_ZORK,        0x0011 }, /* must come after adpcm_ima_wav in this list */
00315     { CODEC_ID_ADPCM_YAMAHA,    0x0020 },
00316     { CODEC_ID_TRUESPEECH,      0x0022 },
00317     { CODEC_ID_GSM_MS,          0x0031 },
00318     { CODEC_ID_AMR_NB,          0x0038 },  /* rogue format number */
00319     { CODEC_ID_ADPCM_G726,      0x0045 },
00320     { CODEC_ID_MP2,             0x0050 },
00321     { CODEC_ID_MP3,             0x0055 },
00322     { CODEC_ID_AMR_NB,          0x0057 },
00323     { CODEC_ID_AMR_WB,          0x0058 },
00324     { CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */
00325     { CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */
00326     { CODEC_ID_ADPCM_IMA_WAV,   0x0069 },
00327     { CODEC_ID_VOXWARE,         0x0075 },
00328     { CODEC_ID_AAC,             0x00ff },
00329     { CODEC_ID_SIPR,            0x0130 },
00330     { CODEC_ID_WMAV1,           0x0160 },
00331     { CODEC_ID_WMAV2,           0x0161 },
00332     { CODEC_ID_WMAPRO,          0x0162 },
00333     { CODEC_ID_WMALOSSLESS,     0x0163 },
00334     { CODEC_ID_ADPCM_CT,        0x0200 },
00335     { CODEC_ID_ATRAC3,          0x0270 },
00336     { CODEC_ID_ADPCM_G722,      0x028F },
00337     { CODEC_ID_IMC,             0x0401 },
00338     { CODEC_ID_GSM_MS,          0x1500 },
00339     { CODEC_ID_TRUESPEECH,      0x1501 },
00340     { CODEC_ID_AAC,             0x1600 }, /* ADTS AAC */
00341     { CODEC_ID_AAC_LATM,        0x1602 },
00342     { CODEC_ID_AC3,             0x2000 },
00343     { CODEC_ID_DTS,             0x2001 },
00344     { CODEC_ID_SONIC,           0x2048 },
00345     { CODEC_ID_SONIC_LS,        0x2048 },
00346     { CODEC_ID_PCM_MULAW,       0x6c75 },
00347     { CODEC_ID_AAC,             0x706d },
00348     { CODEC_ID_AAC,             0x4143 },
00349     { CODEC_ID_SPEEX,           0xA109 },
00350     { CODEC_ID_FLAC,            0xF1AC },
00351     { CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },
00352     { CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
00353 
00354     /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
00355     // for NuppelVideo (nuv.c)
00356     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
00357     { CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
00358     { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
00359     { CODEC_ID_NONE,      0 },
00360 };
00361 
00362 const AVCodecGuid ff_codec_wav_guids[] = {
00363     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00364     {CODEC_ID_ATRAC3P,    {0xBF,0xAA,0x23,0xE9,0x58,0xCB,0x71,0x44,0xA1,0x19,0xFF,0xFA,0x01,0xE4,0xCE,0x62}},
00365     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
00366     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00367     {CODEC_ID_NONE}
00368 };
00369 
00370 const AVMetadataConv ff_riff_info_conv[] = {
00371     { "IART", "artist"    },
00372     { "ICMT", "comment"   },
00373     { "ICOP", "copyright" },
00374     { "ICRD", "date"      },
00375     { "IGNR", "genre"     },
00376     { "ILNG", "language"  },
00377     { "INAM", "title"     },
00378     { "IPRD", "album"     },
00379     { "IPRT", "track"     },
00380     { "ISFT", "encoder"   },
00381     { "ITCH", "encoded_by"},
00382     { 0 },
00383 };
00384 
00385 const char ff_riff_tags[][5] = {
00386     "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
00387     "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
00388     "IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH",
00389     {0}
00390 };
00391 
00392 #if CONFIG_MUXERS
00393 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
00394 {
00395     ffio_wfourcc(pb, tag);
00396     avio_wl32(pb, 0);
00397     return avio_tell(pb);
00398 }
00399 
00400 void ff_end_tag(AVIOContext *pb, int64_t start)
00401 {
00402     int64_t pos;
00403 
00404     pos = avio_tell(pb);
00405     avio_seek(pb, start - 4, SEEK_SET);
00406     avio_wl32(pb, (uint32_t)(pos - start));
00407     avio_seek(pb, pos, SEEK_SET);
00408 }
00409 
00410 /* WAVEFORMATEX header */
00411 /* returns the size or -1 on error */
00412 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
00413 {
00414     int bps, blkalign, bytespersec;
00415     int hdrsize = 18;
00416     int waveformatextensible;
00417     uint8_t temp[256];
00418     uint8_t *riff_extradata= temp;
00419     uint8_t *riff_extradata_start= temp;
00420 
00421     if(!enc->codec_tag || enc->codec_tag > 0xffff)
00422         return -1;
00423     waveformatextensible =   (enc->channels > 2 && enc->channel_layout)
00424                           || enc->sample_rate > 48000
00425                           || av_get_bits_per_sample(enc->codec_id) > 16;
00426 
00427     if (waveformatextensible) {
00428         avio_wl16(pb, 0xfffe);
00429     } else {
00430         avio_wl16(pb, enc->codec_tag);
00431     }
00432     avio_wl16(pb, enc->channels);
00433     avio_wl32(pb, enc->sample_rate);
00434     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
00435         bps = 0;
00436     } else {
00437         if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
00438             if (enc->bits_per_coded_sample)
00439                 bps = enc->bits_per_coded_sample;
00440             else
00441                 bps = 16; // default to 16
00442         }
00443     }
00444     if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){
00445         av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);
00446     }
00447 
00448     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
00449         blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
00450         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
00451     } else if (enc->codec_id == CODEC_ID_AC3) {
00452             blkalign = 3840; //maximum bytes per frame
00453     } else if (enc->block_align != 0) { /* specified by the codec */
00454         blkalign = enc->block_align;
00455     } else
00456         blkalign = bps * enc->channels / av_gcd(8, bps);
00457     if (enc->codec_id == CODEC_ID_PCM_U8 ||
00458         enc->codec_id == CODEC_ID_PCM_S24LE ||
00459         enc->codec_id == CODEC_ID_PCM_S32LE ||
00460         enc->codec_id == CODEC_ID_PCM_F32LE ||
00461         enc->codec_id == CODEC_ID_PCM_F64LE ||
00462         enc->codec_id == CODEC_ID_PCM_S16LE) {
00463         bytespersec = enc->sample_rate * blkalign;
00464     } else {
00465         bytespersec = enc->bit_rate / 8;
00466     }
00467     avio_wl32(pb, bytespersec); /* bytes per second */
00468     avio_wl16(pb, blkalign); /* block align */
00469     avio_wl16(pb, bps); /* bits per sample */
00470     if (enc->codec_id == CODEC_ID_MP3) {
00471         hdrsize += 12;
00472         bytestream_put_le16(&riff_extradata, 1);    /* wID */
00473         bytestream_put_le32(&riff_extradata, 2);    /* fdwFlags */
00474         bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
00475         bytestream_put_le16(&riff_extradata, 1);    /* nFramesPerBlock */
00476         bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
00477     } else if (enc->codec_id == CODEC_ID_MP2) {
00478         hdrsize += 22;
00479         bytestream_put_le16(&riff_extradata, 2);                          /* fwHeadLayer */
00480         bytestream_put_le32(&riff_extradata, enc->bit_rate);              /* dwHeadBitrate */
00481         bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
00482         bytestream_put_le16(&riff_extradata, 0);                          /* fwHeadModeExt */
00483         bytestream_put_le16(&riff_extradata, 1);                          /* wHeadEmphasis */
00484         bytestream_put_le16(&riff_extradata, 16);                         /* fwHeadFlags */
00485         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSLow */
00486         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSHigh */
00487     } else if (enc->codec_id == CODEC_ID_GSM_MS || enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
00488         hdrsize += 2;
00489         bytestream_put_le16(&riff_extradata, enc->frame_size); /* wSamplesPerBlock */
00490     } else if(enc->extradata_size){
00491         riff_extradata_start= enc->extradata;
00492         riff_extradata= enc->extradata + enc->extradata_size;
00493         hdrsize += enc->extradata_size;
00494     }
00495     if(waveformatextensible) {                                    /* write WAVEFORMATEXTENSIBLE extensions */
00496         hdrsize += 22;
00497         avio_wl16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */
00498         avio_wl16(pb, bps);                                        /* ValidBitsPerSample || SamplesPerBlock || Reserved */
00499         avio_wl32(pb, enc->channel_layout);                        /* dwChannelMask */
00500         avio_wl32(pb, enc->codec_tag);                             /* GUID + next 3 */
00501         avio_wl32(pb, 0x00100000);
00502         avio_wl32(pb, 0xAA000080);
00503         avio_wl32(pb, 0x719B3800);
00504     } else {
00505         avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
00506     }
00507     avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
00508     if(hdrsize&1){
00509         hdrsize++;
00510         avio_w8(pb, 0);
00511     }
00512 
00513     return hdrsize;
00514 }
00515 
00516 /* BITMAPINFOHEADER header */
00517 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
00518 {
00519     avio_wl32(pb, 40 + enc->extradata_size); /* size */
00520     avio_wl32(pb, enc->width);
00521     //We always store RGB TopDown
00522     avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
00523     avio_wl16(pb, 1); /* planes */
00524 
00525     avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */
00526     /* compression type */
00527     avio_wl32(pb, enc->codec_tag);
00528     avio_wl32(pb, (enc->width * enc->height * (enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24)+7) / 8);
00529     avio_wl32(pb, 0);
00530     avio_wl32(pb, 0);
00531     avio_wl32(pb, 0);
00532     avio_wl32(pb, 0);
00533 
00534     avio_write(pb, enc->extradata, enc->extradata_size);
00535 
00536     if (!for_asf && enc->extradata_size & 1)
00537         avio_w8(pb, 0);
00538 }
00539 #endif //CONFIG_MUXERS
00540 
00541 #if CONFIG_DEMUXERS
00542 /* We could be given one of the three possible structures here:
00543  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
00544  * is an expansion of the previous one with the fields added
00545  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
00546  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
00547  * an openended structure.
00548  */
00549 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
00550 {
00551     int id;
00552 
00553     id = avio_rl16(pb);
00554     codec->codec_type = AVMEDIA_TYPE_AUDIO;
00555     codec->channels = avio_rl16(pb);
00556     codec->sample_rate = avio_rl32(pb);
00557     codec->bit_rate = avio_rl32(pb) * 8;
00558     codec->block_align = avio_rl16(pb);
00559     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
00560         codec->bits_per_coded_sample = 8;
00561     }else
00562         codec->bits_per_coded_sample = avio_rl16(pb);
00563     if (id == 0xFFFE) {
00564         codec->codec_tag = 0;
00565     } else {
00566         codec->codec_tag = id;
00567         codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);
00568     }
00569     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
00570         int cbSize = avio_rl16(pb); /* cbSize */
00571         size -= 18;
00572         cbSize = FFMIN(size, cbSize);
00573         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
00574             ff_asf_guid subformat;
00575             codec->bits_per_coded_sample = avio_rl16(pb);
00576             codec->channel_layout = avio_rl32(pb); /* dwChannelMask */
00577             ff_get_guid(pb, &subformat);
00578             if (!memcmp(subformat + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
00579                 codec->codec_tag = AV_RL32(subformat);
00580                 codec->codec_id = ff_wav_codec_get_id(codec->codec_tag, codec->bits_per_coded_sample);
00581             } else {
00582                 codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
00583                 if (!codec->codec_id)
00584                     av_log(codec, AV_LOG_WARNING, "unknown subformat:"FF_PRI_GUID"\n", FF_ARG_GUID(subformat));
00585             }
00586             cbSize -= 22;
00587             size -= 22;
00588         }
00589         codec->extradata_size = cbSize;
00590         if (cbSize > 0) {
00591             av_free(codec->extradata);
00592             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00593             if (!codec->extradata)
00594                 return AVERROR(ENOMEM);
00595             avio_read(pb, codec->extradata, codec->extradata_size);
00596             size -= cbSize;
00597         }
00598 
00599         /* It is possible for the chunk to contain garbage at the end */
00600         if (size > 0)
00601             avio_skip(pb, size);
00602     }
00603     if (codec->codec_id == CODEC_ID_AAC_LATM) {
00604         /* channels and sample_rate values are those prior to applying SBR and/or PS */
00605         codec->channels    = 0;
00606         codec->sample_rate = 0;
00607     }
00608     /* override bits_per_coded_sample for G.726 */
00609     if (codec->codec_id == CODEC_ID_ADPCM_G726)
00610         codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
00611 
00612     return 0;
00613 }
00614 
00615 
00616 enum CodecID ff_wav_codec_get_id(unsigned int tag, int bps)
00617 {
00618     enum CodecID id;
00619     id = ff_codec_get_id(ff_codec_wav_tags, tag);
00620     if (id <= 0)
00621         return id;
00622     /* handle specific u8 codec */
00623     if (id == CODEC_ID_PCM_S16LE && bps == 8)
00624         id = CODEC_ID_PCM_U8;
00625     if (id == CODEC_ID_PCM_S16LE && bps == 24)
00626         id = CODEC_ID_PCM_S24LE;
00627     if (id == CODEC_ID_PCM_S16LE && bps == 32)
00628         id = CODEC_ID_PCM_S32LE;
00629     if (id == CODEC_ID_PCM_F32LE && bps == 64)
00630         id = CODEC_ID_PCM_F64LE;
00631     if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)
00632         id = CODEC_ID_PCM_ZORK;
00633     return id;
00634 }
00635 
00636 int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
00637 {
00638     int tag1;
00639     avio_rl32(pb); /* size */
00640     st->codec->width = avio_rl32(pb);
00641     st->codec->height = (int32_t)avio_rl32(pb);
00642     avio_rl16(pb); /* planes */
00643     st->codec->bits_per_coded_sample= avio_rl16(pb); /* depth */
00644     tag1 = avio_rl32(pb);
00645     avio_rl32(pb); /* ImageSize */
00646     avio_rl32(pb); /* XPelsPerMeter */
00647     avio_rl32(pb); /* YPelsPerMeter */
00648     avio_rl32(pb); /* ClrUsed */
00649     avio_rl32(pb); /* ClrImportant */
00650     return tag1;
00651 }
00652 #endif // CONFIG_DEMUXERS
00653 
00654 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
00655 {
00656     int gcd;
00657 
00658     *au_ssize= stream->block_align;
00659     if(stream->frame_size && stream->sample_rate){
00660         *au_scale=stream->frame_size;
00661         *au_rate= stream->sample_rate;
00662     }else if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00663              stream->codec_type == AVMEDIA_TYPE_DATA ||
00664              stream->codec_type == AVMEDIA_TYPE_SUBTITLE){
00665         *au_scale= stream->time_base.num;
00666         *au_rate = stream->time_base.den;
00667     }else{
00668         *au_scale= stream->block_align ? stream->block_align*8 : 8;
00669         *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
00670     }
00671     gcd= av_gcd(*au_scale, *au_rate);
00672     *au_scale /= gcd;
00673     *au_rate /= gcd;
00674 }
00675 
00676 void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
00677 {
00678     assert(sizeof(*g) == 16);
00679     if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g))
00680         memset(*g, 0, sizeof(*g));
00681 }
00682 
00683 enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
00684 {
00685     int i;
00686     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
00687         if (!ff_guidcmp(guids[i].guid, guid))
00688             return guids[i].id;
00689     }
00690     return CODEC_ID_NONE;
00691 }
00692 
00693 int ff_read_riff_info(AVFormatContext *s, int64_t size)
00694 {
00695     int64_t start, end, cur;
00696     AVIOContext *pb = s->pb;
00697 
00698     start = avio_tell(pb);
00699     end = start + size;
00700 
00701     while ((cur = avio_tell(pb)) >= 0 && cur <= end - 8 /* = tag + size */) {
00702         uint32_t chunk_code;
00703         int64_t chunk_size;
00704         char key[5] = {0};
00705         char *value;
00706 
00707         chunk_code = avio_rl32(pb);
00708         chunk_size = avio_rl32(pb);
00709         if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
00710             av_log(s, AV_LOG_ERROR, "too big INFO subchunk\n");
00711             return AVERROR_INVALIDDATA;
00712         }
00713 
00714         chunk_size += (chunk_size & 1);
00715 
00716         value = av_malloc(chunk_size + 1);
00717         if (!value) {
00718             av_log(s, AV_LOG_ERROR, "out of memory, unable to read INFO tag\n");
00719             return AVERROR(ENOMEM);
00720         }
00721 
00722         AV_WL32(key, chunk_code);
00723 
00724         if (avio_read(pb, value, chunk_size) != chunk_size) {
00725             av_freep(&value);
00726             av_log(s, AV_LOG_ERROR, "premature end of file while reading INFO tag\n");
00727             return AVERROR_INVALIDDATA;
00728         }
00729 
00730         value[chunk_size] = 0;
00731 
00732         av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
00733     }
00734 
00735     return 0;
00736 }