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