FFmpeg: libavformat/riff.c Source File

00001 /*
00002  * RIFF common functions and data
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 #include "libavutil/avassert.h"
00029 
00030 /* Note: when encoding, the first matching tag is used, so order is
00031    important if multiple tags possible for a given codec.
00032    Note also that this list is used for more than just riff, other
00033    files use it as well.
00034 */
00035 const AVCodecTag ff_codec_bmp_tags[] = {
00036     { AV_CODEC_ID_H264,         MKTAG('H', '2', '6', '4') },
00037     { AV_CODEC_ID_H264,         MKTAG('h', '2', '6', '4') },
00038     { AV_CODEC_ID_H264,         MKTAG('X', '2', '6', '4') },
00039     { AV_CODEC_ID_H264,         MKTAG('x', '2', '6', '4') },
00040     { AV_CODEC_ID_H264,         MKTAG('a', 'v', 'c', '1') },
00041     { AV_CODEC_ID_H264,         MKTAG('D', 'A', 'V', 'C') },
00042     { AV_CODEC_ID_H264,         MKTAG('S', 'M', 'V', '2') },
00043     { AV_CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },
00044     { AV_CODEC_ID_H264,         MKTAG('Q', '2', '6', '4') }, /* QNAP surveillance system */
00045     { AV_CODEC_ID_H264,         MKTAG('V', '2', '6', '4') },
00046     { AV_CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
00047     { AV_CODEC_ID_H263,         MKTAG('X', '2', '6', '3') },
00048     { AV_CODEC_ID_H263,         MKTAG('T', '2', '6', '3') },
00049     { AV_CODEC_ID_H263,         MKTAG('L', '2', '6', '3') },
00050     { AV_CODEC_ID_H263,         MKTAG('V', 'X', '1', 'K') },
00051     { AV_CODEC_ID_H263,         MKTAG('Z', 'y', 'G', 'o') },
00052     { AV_CODEC_ID_H263,         MKTAG('M', '2', '6', '3') },
00053     { AV_CODEC_ID_H263,         MKTAG('l', 's', 'v', 'm') },
00054     { AV_CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },
00055     { AV_CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */
00056     { AV_CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },
00057     { AV_CODEC_ID_H263,         MKTAG('U', '2', '6', '3') },
00058     { AV_CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },
00059     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },
00060     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },
00061     { AV_CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },
00062     { AV_CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },
00063     { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },
00064     { AV_CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */
00065     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },
00066     { AV_CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },
00067     { AV_CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },
00068     { AV_CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },
00069     { AV_CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },
00070     { AV_CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
00071     { AV_CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
00072     { AV_CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },
00073     { AV_CODEC_ID_MPEG4,        MKTAG('W', 'A', 'W', 'V') }, /* WaWv MPEG-4 Video Codec */
00074     { AV_CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },
00075     { AV_CODEC_ID_MPEG4,        MKTAG('F', 'V', 'F', 'W') },
00076     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'C', 'O', 'D') },
00077     { AV_CODEC_ID_MPEG4,        MKTAG('M', 'V', 'X', 'M') },
00078     { AV_CODEC_ID_MPEG4,        MKTAG('P', 'M', '4', 'V') },
00079     { AV_CODEC_ID_MPEG4,        MKTAG('S', 'M', 'P', '4') },
00080     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'X', 'G', 'M') },
00081     { AV_CODEC_ID_MPEG4,        MKTAG('V', 'I', 'D', 'M') },
00082     { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'T', '3') },
00083     { AV_CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'X') },
00084     { AV_CODEC_ID_MPEG4,        MKTAG('H', 'D', 'X', '4') }, /* flipped video */
00085     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'M', 'K', '2') },
00086     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'G', 'I') },
00087     { AV_CODEC_ID_MPEG4,        MKTAG('I', 'N', 'M', 'C') },
00088     { AV_CODEC_ID_MPEG4,        MKTAG('E', 'P', 'H', 'V') }, /* Ephv MPEG-4 */
00089     { AV_CODEC_ID_MPEG4,        MKTAG('E', 'M', '4', 'A') },
00090     { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'C', 'C') }, /* Divio MPEG-4 */
00091     { AV_CODEC_ID_MPEG4,        MKTAG('S', 'N', '4', '0') },
00092     { AV_CODEC_ID_MPEG4,        MKTAG('V', 'S', 'P', 'X') },
00093     { AV_CODEC_ID_MPEG4,        MKTAG('U', 'L', 'D', 'X') },
00094     { AV_CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'V') },
00095     { AV_CODEC_ID_MPEG4,        MKTAG('S', 'I', 'P', 'P') }, /* Samsung SHR-6040 */
00096     { AV_CODEC_ID_MPEG4,        MKTAG('S', 'M', '4', 'V') },
00097     { AV_CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'X') },
00098     { AV_CODEC_ID_MPEG4,        MKTAG('D', 'r', 'e', 'X') },
00099     { AV_CODEC_ID_MPEG4,        MKTAG('Q', 'M', 'P', '4') }, /* QNAP Systems */
00100     { AV_CODEC_ID_MPEG4,        MKTAG('P', 'L', 'V', '1') }, /* Pelco DVR MPEG-4 */
00101     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
00102     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') },
00103     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },
00104     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },
00105     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },
00106     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },
00107     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'V', 'X', '3') },
00108     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },
00109     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },
00110     { AV_CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },
00111     { AV_CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },
00112     { AV_CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },
00113     { AV_CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },
00114     { AV_CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', '4', '1') },
00115     { AV_CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },
00116     { AV_CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },
00117     { AV_CODEC_ID_WMV2,         MKTAG('G', 'X', 'V', 'E') },
00118     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },
00119     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },
00120     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
00121     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },
00122     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },
00123     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
00124     { AV_CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
00125     { AV_CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */
00126     { AV_CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */
00127     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', ' ') },
00128     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', 's') },
00129     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
00130     { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'i', 's') },
00131     { AV_CODEC_ID_DVVIDEO,      MKTAG('p', 'd', 'v', 'c') },
00132     { AV_CODEC_ID_DVVIDEO,      MKTAG('S', 'L', '2', '5') },
00133     { AV_CODEC_ID_DVVIDEO,      MKTAG('S', 'L', 'D', 'V') },
00134     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },
00135     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },
00136     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },
00137     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
00138     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
00139     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('P', 'I', 'M', '2') },
00140     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
00141     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
00142     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
00143     { AV_CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  16) },
00144     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },
00145     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },
00146     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('L', 'M', 'P', '2') }, /* Lead MPEG2 in avi */
00147     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('s', 'l', 'i', 'f') },
00148     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('E', 'M', '2', 'V') },
00149     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', '7', '0', '1') }, /* Matrox MPEG2 intra-only */
00150     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', 'v') },
00151     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('B', 'W', '1', '0') },
00152     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('X', 'M', 'P', 'G') }, /* Xing MPEG intra only */
00153     { AV_CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },
00154     { AV_CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },
00155     { AV_CODEC_ID_MJPEG,        MKTAG('d', 'm', 'b', '1') },
00156     { AV_CODEC_ID_MJPEG,        MKTAG('m', 'j', 'p', 'a') },
00157     { AV_CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },
00158     { AV_CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
00159     { AV_CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
00160     { AV_CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'P', 'G') },
00161     { AV_CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
00162     { AV_CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },
00163     { AV_CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },
00164     { AV_CODEC_ID_AVRN,         MKTAG('A', 'V', 'R', 'n') },
00165     { AV_CODEC_ID_MJPEG,        MKTAG('A', 'C', 'D', 'V') },
00166     { AV_CODEC_ID_MJPEG,        MKTAG('Q', 'I', 'V', 'G') },
00167     { AV_CODEC_ID_MJPEG,        MKTAG('S', 'L', 'M', 'J') }, /* SL M-JPEG */
00168     { AV_CODEC_ID_MJPEG,        MKTAG('C', 'J', 'P', 'G') }, /* Creative Webcam JPEG */
00169     { AV_CODEC_ID_MJPEG,        MKTAG('I', 'J', 'L', 'V') }, /* Intel JPEG Library Video Codec */
00170     { AV_CODEC_ID_MJPEG,        MKTAG('M', 'V', 'J', 'P') }, /* Midvid JPEG Video Codec */
00171     { AV_CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '1') },
00172     { AV_CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '2') },
00173     { AV_CODEC_ID_MJPEG,        MKTAG('M', 'T', 'S', 'J') },
00174     { AV_CODEC_ID_MJPEG,        MKTAG('Z', 'J', 'P', 'G') }, /* Paradigm Matrix M-JPEG Codec */
00175     { AV_CODEC_ID_MJPEG,        MKTAG('M', 'M', 'J', 'P') },
00176     { AV_CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },
00177     { AV_CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },
00178     { AV_CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },
00179     { AV_CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },
00180     { AV_CODEC_ID_RAWVIDEO,     MKTAG( 3 ,  0 ,  0 ,  0 ) },
00181     { AV_CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },
00182     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },
00183     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },
00184     { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', '4', '2', '2') },
00185     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'N', 'V') },
00186     { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'V') },
00187     { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'Y') },
00188     { AV_CODEC_ID_RAWVIDEO,     MKTAG('u', 'y', 'v', '1') },
00189     { AV_CODEC_ID_RAWVIDEO,     MKTAG('2', 'V', 'u', '1') },
00190     { AV_CODEC_ID_RAWVIDEO,     MKTAG('2', 'v', 'u', 'y') },
00191     { AV_CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', 's') },
00192     { AV_CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', '2') },
00193     { AV_CODEC_ID_RAWVIDEO,     MKTAG('P', '4', '2', '2') },
00194     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },
00195     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '6') },
00196     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '2', '4') },
00197     { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },
00198     { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', 'Y', 'U', 'Y') },
00199     { AV_CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },
00200     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },
00201     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', ' ', ' ') },
00202     { AV_CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },
00203     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
00204     { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
00205     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', '1') },
00206     { AV_CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '1', '2') },
00207     { AV_CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '2', '1') },
00208     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', 'B') },
00209     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', 'B') },
00210     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'V', '9') },
00211     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
00212     { AV_CODEC_ID_RAWVIDEO,     MKTAG('a', 'u', 'v', '2') },
00213     { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'Y', 'U') },
00214     { AV_CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },
00215     { AV_CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },
00216     { AV_CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },
00217     { AV_CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },
00218     { AV_CODEC_ID_V308,         MKTAG('v', '3', '0', '8') },
00219     { AV_CODEC_ID_V408,         MKTAG('v', '4', '0', '8') },
00220     { AV_CODEC_ID_AYUV,         MKTAG('A', 'Y', 'U', 'V') },
00221     { AV_CODEC_ID_V410,         MKTAG('v', '4', '1', '0') },
00222     { AV_CODEC_ID_YUV4,         MKTAG('y', 'u', 'v', '4') },
00223     { AV_CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },
00224     { AV_CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },
00225     { AV_CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },
00226     { AV_CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },
00227     { AV_CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },
00228     { AV_CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },
00229     { AV_CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },
00230     { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },
00231     { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },
00232     { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },
00233     { AV_CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },
00234     { AV_CODEC_ID_VP6F,         MKTAG('F', 'L', 'V', '4') },
00235     { AV_CODEC_ID_VP8,          MKTAG('V', 'P', '8', '0') },
00236     { AV_CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },
00237     { AV_CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },
00238     { AV_CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },
00239     { AV_CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },
00240     { AV_CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },
00241     { AV_CODEC_ID_MIMIC,        MKTAG('L', 'M', '2', '0') },
00242     { AV_CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },
00243     { AV_CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },
00244     { AV_CODEC_ID_MSRLE,        MKTAG( 2 ,  0 ,  0 ,  0 ) },
00245     { AV_CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },
00246     { AV_CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },
00247     { AV_CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },
00248     { AV_CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },
00249     { AV_CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },
00250     { AV_CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },
00251     { AV_CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },
00252     { AV_CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },
00253     { AV_CODEC_ID_TRUEMOTION1,  MKTAG('P', 'V', 'E', 'Z') },
00254     { AV_CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },
00255     { AV_CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },
00256     { AV_CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },
00257     { AV_CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },
00258     { AV_CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },
00259     { AV_CODEC_ID_FLV1,         MKTAG('S', '2', '6', '3') },
00260     { AV_CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },
00261     { AV_CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },
00262     { AV_CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },
00263     { AV_CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },
00264     { AV_CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },
00265     { AV_CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },
00266     { AV_CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },
00267     { AV_CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },
00268     { AV_CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },
00269     { AV_CODEC_ID_WMV3IMAGE,    MKTAG('W', 'M', 'V', 'P') },
00270     { AV_CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },
00271     { AV_CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },
00272     { AV_CODEC_ID_VC1IMAGE,     MKTAG('W', 'V', 'P', '2') },
00273     { AV_CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },
00274     { AV_CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },
00275     { AV_CODEC_ID_WNV1,         MKTAG('Y', 'U', 'V', '8') },
00276     { AV_CODEC_ID_AASC,         MKTAG('A', 'A', 'S', '4') },
00277     { AV_CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },
00278     { AV_CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },
00279     { AV_CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },
00280     { AV_CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },
00281     { AV_CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },
00282     { AV_CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },
00283     { AV_CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },
00284     { AV_CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },
00285     { AV_CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },
00286     { AV_CODEC_ID_JPEG2000,     MKTAG('m', 'j', 'p', '2') },
00287     { AV_CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },
00288     { AV_CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'C') },
00289     { AV_CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'K') },
00290     { AV_CODEC_ID_JPEG2000,     MKTAG('I', 'P', 'J', '2') },
00291     { AV_CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },
00292     { AV_CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },
00293     { AV_CODEC_ID_PNG,          MKTAG('M', 'P', 'N', 'G') },
00294     { AV_CODEC_ID_PNG,          MKTAG('P', 'N', 'G', '1') },
00295     { AV_CODEC_ID_CLJR,         MKTAG('C', 'L', 'J', 'R') },
00296     { AV_CODEC_ID_DIRAC,        MKTAG('d', 'r', 'a', 'c') },
00297     { AV_CODEC_ID_RPZA,         MKTAG('a', 'z', 'p', 'r') },
00298     { AV_CODEC_ID_RPZA,         MKTAG('R', 'P', 'Z', 'A') },
00299     { AV_CODEC_ID_RPZA,         MKTAG('r', 'p', 'z', 'a') },
00300     { AV_CODEC_ID_SP5X,         MKTAG('S', 'P', '5', '4') },
00301     { AV_CODEC_ID_AURA,         MKTAG('A', 'U', 'R', 'A') },
00302     { AV_CODEC_ID_AURA2,        MKTAG('A', 'U', 'R', '2') },
00303     { AV_CODEC_ID_DPX,          MKTAG('d', 'p', 'x', ' ') },
00304     { AV_CODEC_ID_KGV1,         MKTAG('K', 'G', 'V', '1') },
00305     { AV_CODEC_ID_LAGARITH,     MKTAG('L', 'A', 'G', 'S') },
00306     { AV_CODEC_ID_G2M,          MKTAG('G', '2', 'M', '2') },
00307     { AV_CODEC_ID_G2M,          MKTAG('G', '2', 'M', '3') },
00308     { AV_CODEC_ID_G2M,          MKTAG('G', '2', 'M', '4') },
00309     { AV_CODEC_ID_AMV,          MKTAG('A', 'M', 'V', 'F') },
00310     { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'A') },
00311     { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'G') },
00312     { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '0') },
00313     { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '2') },
00314     { AV_CODEC_ID_VBLE,         MKTAG('V', 'B', 'L', 'E') },
00315     { AV_CODEC_ID_ESCAPE130,    MKTAG('E', '1', '3', '0') },
00316     { AV_CODEC_ID_DXTORY,       MKTAG('x', 't', 'o', 'r') },
00317     { AV_CODEC_ID_ZEROCODEC,    MKTAG('Z', 'E', 'C', 'O') },
00318     { AV_CODEC_ID_Y41P,         MKTAG('Y', '4', '1', 'P') },
00319     { AV_CODEC_ID_FLIC,         MKTAG('A', 'F', 'L', 'C') },
00320     { AV_CODEC_ID_EXR,          MKTAG('e', 'x', 'r', ' ') },
00321     { AV_CODEC_ID_MSS1,         MKTAG('M', 'S', 'S', '1') },
00322     { AV_CODEC_ID_MSA1,         MKTAG('M', 'S', 'A', '1') },
00323     { AV_CODEC_ID_TSCC2,        MKTAG('T', 'S', 'C', '2') },
00324     { AV_CODEC_ID_MTS2,         MKTAG('M', 'T', 'S', '2') },
00325     { AV_CODEC_ID_CLLC,         MKTAG('C', 'L', 'L', 'C') },
00326     { AV_CODEC_ID_MSS2,         MKTAG('M', 'S', 'S', '2') },
00327     { AV_CODEC_ID_SVQ3,         MKTAG('S', 'V', 'Q', '3') },
00328     { AV_CODEC_ID_NONE,         0 }
00329 };
00330 
00331 const AVCodecTag ff_codec_wav_tags[] = {
00332     { AV_CODEC_ID_PCM_S16LE,       0x0001 },
00333     { AV_CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */
00334     { AV_CODEC_ID_PCM_S24LE,       0x0001 },
00335     { AV_CODEC_ID_PCM_S32LE,       0x0001 },
00336     { AV_CODEC_ID_ADPCM_MS,        0x0002 },
00337     { AV_CODEC_ID_PCM_F32LE,       0x0003 },
00338     { AV_CODEC_ID_PCM_F64LE,       0x0003 }, /* must come after f32le in this list */
00339     { AV_CODEC_ID_PCM_ALAW,        0x0006 },
00340     { AV_CODEC_ID_PCM_MULAW,       0x0007 },
00341     { AV_CODEC_ID_WMAVOICE,        0x000A },
00342     { AV_CODEC_ID_ADPCM_IMA_OKI,   0x0010 },
00343     { AV_CODEC_ID_ADPCM_IMA_WAV,   0x0011 },
00344     { AV_CODEC_ID_PCM_ZORK,        0x0011 }, /* must come after adpcm_ima_wav in this list */
00345     { AV_CODEC_ID_ADPCM_IMA_OKI,   0x0017 },
00346     { AV_CODEC_ID_ADPCM_YAMAHA,    0x0020 },
00347     { AV_CODEC_ID_TRUESPEECH,      0x0022 },
00348     { AV_CODEC_ID_GSM_MS,          0x0031 },
00349     { AV_CODEC_ID_AMR_NB,          0x0038 },  /* rogue format number */
00350     { AV_CODEC_ID_G723_1,          0x0042 },
00351     { AV_CODEC_ID_ADPCM_G726,      0x0045 },
00352     { AV_CODEC_ID_MP2,             0x0050 },
00353     { AV_CODEC_ID_MP3,             0x0055 },
00354     { AV_CODEC_ID_AMR_NB,          0x0057 },
00355     { AV_CODEC_ID_AMR_WB,          0x0058 },
00356     { AV_CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */
00357     { AV_CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */
00358     { AV_CODEC_ID_ADPCM_IMA_WAV,   0x0069 },
00359     { AV_CODEC_ID_VOXWARE,         0x0075 },
00360     { AV_CODEC_ID_AAC,             0x00ff },
00361     { AV_CODEC_ID_SIPR,            0x0130 },
00362     { AV_CODEC_ID_WMAV1,           0x0160 },
00363     { AV_CODEC_ID_WMAV2,           0x0161 },
00364     { AV_CODEC_ID_WMAPRO,          0x0162 },
00365     { AV_CODEC_ID_WMALOSSLESS,     0x0163 },
00366     { AV_CODEC_ID_ADPCM_CT,        0x0200 },
00367     { AV_CODEC_ID_ATRAC3,          0x0270 },
00368     { AV_CODEC_ID_ADPCM_G722,      0x028F },
00369     { AV_CODEC_ID_IMC,             0x0401 },
00370     { AV_CODEC_ID_IAC,             0x0402 },
00371     { AV_CODEC_ID_GSM_MS,          0x1500 },
00372     { AV_CODEC_ID_TRUESPEECH,      0x1501 },
00373     { AV_CODEC_ID_AAC,             0x1600 }, /* ADTS AAC */
00374     { AV_CODEC_ID_AAC_LATM,        0x1602 },
00375     { AV_CODEC_ID_AC3,             0x2000 },
00376     { AV_CODEC_ID_DTS,             0x2001 },
00377     { AV_CODEC_ID_SONIC,           0x2048 },
00378     { AV_CODEC_ID_SONIC_LS,        0x2048 },
00379     { AV_CODEC_ID_PCM_MULAW,       0x6c75 },
00380     { AV_CODEC_ID_AAC,             0x706d },
00381     { AV_CODEC_ID_AAC,             0x4143 },
00382     { AV_CODEC_ID_G723_1,          0xA100 },
00383     { AV_CODEC_ID_AAC,             0xA106 },
00384     { AV_CODEC_ID_SPEEX,           0xA109 },
00385     { AV_CODEC_ID_FLAC,            0xF1AC },
00386     { AV_CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },
00387     { AV_CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
00388     { AV_CODEC_ID_NONE,      0 },
00389 };
00390 
00391 const AVCodecGuid ff_codec_wav_guids[] = {
00392     {AV_CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00393     {AV_CODEC_ID_ATRAC3P,    {0xBF,0xAA,0x23,0xE9,0x58,0xCB,0x71,0x44,0xA1,0x19,0xFF,0xFA,0x01,0xE4,0xCE,0x62}},
00394     {AV_CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
00395     {AV_CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00396     {AV_CODEC_ID_NONE}
00397 };
00398 
00399 const AVMetadataConv ff_riff_info_conv[] = {
00400     { "IART", "artist"    },
00401     { "ICMT", "comment"   },
00402     { "ICOP", "copyright" },
00403     { "ICRD", "date"      },
00404     { "IGNR", "genre"     },
00405     { "ILNG", "language"  },
00406     { "INAM", "title"     },
00407     { "IPRD", "album"     },
00408     { "IPRT", "track"     },
00409     { "ISFT", "encoder"   },
00410     { "ISMP", "timecode"  },
00411     { "ITCH", "encoded_by"},
00412     { 0 },
00413 };
00414 
00415 #if CONFIG_MUXERS
00416 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
00417 {
00418     ffio_wfourcc(pb, tag);
00419     avio_wl32(pb, 0);
00420     return avio_tell(pb);
00421 }
00422 
00423 void ff_end_tag(AVIOContext *pb, int64_t start)
00424 {
00425     int64_t pos;
00426 
00427     pos = avio_tell(pb);
00428     avio_seek(pb, start - 4, SEEK_SET);
00429     avio_wl32(pb, (uint32_t)(pos - start));
00430     avio_seek(pb, pos, SEEK_SET);
00431 }
00432 
00433 /* WAVEFORMATEX header */
00434 /* returns the size or -1 on error */
00435 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
00436 {
00437     int bps, blkalign, bytespersec, frame_size;
00438     int hdrsize = 18;
00439     int waveformatextensible;
00440     uint8_t temp[256];
00441     uint8_t *riff_extradata= temp;
00442     uint8_t *riff_extradata_start= temp;
00443 
00444     if(!enc->codec_tag || enc->codec_tag > 0xffff)
00445         return -1;
00446 
00447     /* We use the known constant frame size for the codec if known, otherwise
00448        fallback to using AVCodecContext.frame_size, which is not as reliable
00449        for indicating packet duration */
00450     frame_size = av_get_audio_frame_duration(enc, 0);
00451     if (!frame_size)
00452         frame_size = enc->frame_size;
00453 
00454     waveformatextensible =   (enc->channels > 2 && enc->channel_layout)
00455                           || enc->sample_rate > 48000
00456                           || av_get_bits_per_sample(enc->codec_id) > 16;
00457 
00458     if (waveformatextensible) {
00459         avio_wl16(pb, 0xfffe);
00460     } else {
00461         avio_wl16(pb, enc->codec_tag);
00462     }
00463     avio_wl16(pb, enc->channels);
00464     avio_wl32(pb, enc->sample_rate);
00465     if (enc->codec_id == AV_CODEC_ID_ATRAC3 ||
00466         enc->codec_id == AV_CODEC_ID_G723_1 ||
00467         enc->codec_id == AV_CODEC_ID_GSM_MS ||
00468         enc->codec_id == AV_CODEC_ID_MP2    ||
00469         enc->codec_id == AV_CODEC_ID_MP3) {
00470         bps = 0;
00471     } else {
00472         if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
00473             if (enc->bits_per_coded_sample)
00474                 bps = enc->bits_per_coded_sample;
00475             else
00476                 bps = 16; // default to 16
00477         }
00478     }
00479     if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){
00480         av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);
00481     }
00482 
00483     if (enc->codec_id == AV_CODEC_ID_MP2 || enc->codec_id == AV_CODEC_ID_MP3) {
00484         /* this is wrong, but it seems many demuxers do not work if this is set
00485            correctly */
00486         blkalign = frame_size;
00487         //blkalign = 144 * enc->bit_rate/enc->sample_rate;
00488     } else if (enc->codec_id == AV_CODEC_ID_AC3) {
00489             blkalign = 3840; //maximum bytes per frame
00490     } else if (enc->codec_id == AV_CODEC_ID_AAC) {
00491             blkalign = 768 * enc->channels; //maximum bytes per frame
00492     } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
00493             blkalign = 24;
00494     } else if (enc->block_align != 0) { /* specified by the codec */
00495         blkalign = enc->block_align;
00496     } else
00497         blkalign = bps * enc->channels / av_gcd(8, bps);
00498     if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
00499         enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
00500         enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
00501         enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
00502         enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
00503         enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
00504         bytespersec = enc->sample_rate * blkalign;
00505     } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
00506         bytespersec = 800;
00507     } else {
00508         bytespersec = enc->bit_rate / 8;
00509     }
00510     avio_wl32(pb, bytespersec); /* bytes per second */
00511     avio_wl16(pb, blkalign); /* block align */
00512     avio_wl16(pb, bps); /* bits per sample */
00513     if (enc->codec_id == AV_CODEC_ID_MP3) {
00514         hdrsize += 12;
00515         bytestream_put_le16(&riff_extradata, 1);    /* wID */
00516         bytestream_put_le32(&riff_extradata, 2);    /* fdwFlags */
00517         bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
00518         bytestream_put_le16(&riff_extradata, 1);    /* nFramesPerBlock */
00519         bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
00520     } else if (enc->codec_id == AV_CODEC_ID_MP2) {
00521         hdrsize += 22;
00522         bytestream_put_le16(&riff_extradata, 2);                          /* fwHeadLayer */
00523         bytestream_put_le32(&riff_extradata, enc->bit_rate);              /* dwHeadBitrate */
00524         bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
00525         bytestream_put_le16(&riff_extradata, 0);                          /* fwHeadModeExt */
00526         bytestream_put_le16(&riff_extradata, 1);                          /* wHeadEmphasis */
00527         bytestream_put_le16(&riff_extradata, 16);                         /* fwHeadFlags */
00528         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSLow */
00529         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSHigh */
00530     } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
00531         hdrsize += 20;
00532         bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */
00533         bytestream_put_le32(&riff_extradata, 0xaea2f732);
00534         bytestream_put_le16(&riff_extradata, 0xacde);
00535     } else if (enc->codec_id == AV_CODEC_ID_GSM_MS || enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
00536         hdrsize += 2;
00537         bytestream_put_le16(&riff_extradata, frame_size); /* wSamplesPerBlock */
00538     } else if(enc->extradata_size){
00539         riff_extradata_start= enc->extradata;
00540         riff_extradata= enc->extradata + enc->extradata_size;
00541         hdrsize += enc->extradata_size;
00542     }
00543     if(waveformatextensible) {                                    /* write WAVEFORMATEXTENSIBLE extensions */
00544         hdrsize += 22;
00545         avio_wl16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */
00546         avio_wl16(pb, bps);                                        /* ValidBitsPerSample || SamplesPerBlock || Reserved */
00547         avio_wl32(pb, enc->channel_layout);                        /* dwChannelMask */
00548         avio_wl32(pb, enc->codec_tag);                             /* GUID + next 3 */
00549         avio_wl32(pb, 0x00100000);
00550         avio_wl32(pb, 0xAA000080);
00551         avio_wl32(pb, 0x719B3800);
00552     } else {
00553         avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
00554     }
00555     avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
00556     if(hdrsize&1){
00557         hdrsize++;
00558         avio_w8(pb, 0);
00559     }
00560 
00561     return hdrsize;
00562 }
00563 
00564 /* BITMAPINFOHEADER header */
00565 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
00566 {
00567     avio_wl32(pb, 40 + enc->extradata_size); /* size */
00568     avio_wl32(pb, enc->width);
00569     //We always store RGB TopDown
00570     avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
00571     avio_wl16(pb, 1); /* planes */
00572 
00573     avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */
00574     /* compression type */
00575     avio_wl32(pb, enc->codec_tag);
00576     avio_wl32(pb, (enc->width * enc->height * (enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24)+7) / 8);
00577     avio_wl32(pb, 0);
00578     avio_wl32(pb, 0);
00579     avio_wl32(pb, 0);
00580     avio_wl32(pb, 0);
00581 
00582     avio_write(pb, enc->extradata, enc->extradata_size);
00583 
00584     if (!for_asf && enc->extradata_size & 1)
00585         avio_w8(pb, 0);
00586 }
00587 
00588 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
00589 {
00590     int gcd;
00591     int audio_frame_size;
00592 
00593     /* We use the known constant frame size for the codec if known, otherwise
00594        fallback to using AVCodecContext.frame_size, which is not as reliable
00595        for indicating packet duration */
00596     audio_frame_size = av_get_audio_frame_duration(stream, 0);
00597     if (!audio_frame_size)
00598         audio_frame_size = stream->frame_size;
00599 
00600     *au_ssize= stream->block_align;
00601     if (audio_frame_size && stream->sample_rate) {
00602         *au_scale = audio_frame_size;
00603         *au_rate= stream->sample_rate;
00604     }else if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00605              stream->codec_type == AVMEDIA_TYPE_DATA ||
00606              stream->codec_type == AVMEDIA_TYPE_SUBTITLE){
00607         *au_scale= stream->time_base.num;
00608         *au_rate = stream->time_base.den;
00609     }else{
00610         *au_scale= stream->block_align ? stream->block_align*8 : 8;
00611         *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
00612     }
00613     gcd= av_gcd(*au_scale, *au_rate);
00614     *au_scale /= gcd;
00615     *au_rate /= gcd;
00616 }
00617 
00618 void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
00619 {
00620     int len = strlen(str);
00621     if (len > 0) {
00622         len++;
00623         ffio_wfourcc(pb, tag);
00624         avio_wl32(pb, len);
00625         avio_put_str(pb, str);
00626         if (len & 1)
00627             avio_w8(pb, 0);
00628     }
00629 }
00630 
00631 static const char riff_tags[][5] = {
00632     "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
00633     "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
00634     "IPRT", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
00635     {0}
00636 };
00637 
00638 static int riff_has_valid_tags(AVFormatContext *s)
00639 {
00640     int i;
00641 
00642     for (i = 0; *riff_tags[i]; i++) {
00643         if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
00644             return 1;
00645     }
00646 
00647     return 0;
00648 }
00649 
00650 void ff_riff_write_info(AVFormatContext *s)
00651 {
00652     AVIOContext *pb = s->pb;
00653     int i;
00654     int64_t list_pos;
00655     AVDictionaryEntry *t = NULL;
00656 
00657     ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
00658 
00659     /* writing empty LIST is not nice and may cause problems */
00660     if (!riff_has_valid_tags(s))
00661         return;
00662 
00663     list_pos = ff_start_tag(pb, "LIST");
00664     ffio_wfourcc(pb, "INFO");
00665     for (i = 0; *riff_tags[i]; i++) {
00666         if ((t = av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE)))
00667             ff_riff_write_info_tag(s->pb, t->key, t->value);
00668     }
00669     ff_end_tag(pb, list_pos);
00670 }
00671 #endif //CONFIG_MUXERS
00672 
00673 #if CONFIG_DEMUXERS
00674 /* We could be given one of the three possible structures here:
00675  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
00676  * is an expansion of the previous one with the fields added
00677  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
00678  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
00679  * an openended structure.
00680  */
00681 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
00682 {
00683     int id;
00684 
00685     id = avio_rl16(pb);
00686     codec->codec_type = AVMEDIA_TYPE_AUDIO;
00687     codec->channels = avio_rl16(pb);
00688     codec->sample_rate = avio_rl32(pb);
00689     codec->bit_rate = avio_rl32(pb) * 8;
00690     codec->block_align = avio_rl16(pb);
00691     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
00692         codec->bits_per_coded_sample = 8;
00693     }else
00694         codec->bits_per_coded_sample = avio_rl16(pb);
00695     if (id == 0xFFFE) {
00696         codec->codec_tag = 0;
00697     } else {
00698         codec->codec_tag = id;
00699         codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);
00700     }
00701     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
00702         int cbSize = avio_rl16(pb); /* cbSize */
00703         size -= 18;
00704         cbSize = FFMIN(size, cbSize);
00705         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
00706             ff_asf_guid subformat;
00707             int bps = avio_rl16(pb);
00708             if (bps)
00709                 codec->bits_per_coded_sample = bps;
00710             codec->channel_layout = avio_rl32(pb); /* dwChannelMask */
00711             ff_get_guid(pb, &subformat);
00712             if (!memcmp(subformat + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
00713                 codec->codec_tag = AV_RL32(subformat);
00714                 codec->codec_id = ff_wav_codec_get_id(codec->codec_tag, codec->bits_per_coded_sample);
00715             } else {
00716                 codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
00717                 if (!codec->codec_id)
00718                     av_log(codec, AV_LOG_WARNING, "unknown subformat:"FF_PRI_GUID"\n", FF_ARG_GUID(subformat));
00719             }
00720             cbSize -= 22;
00721             size -= 22;
00722         }
00723         codec->extradata_size = cbSize;
00724         if (cbSize > 0) {
00725             av_free(codec->extradata);
00726             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00727             if (!codec->extradata)
00728                 return AVERROR(ENOMEM);
00729             avio_read(pb, codec->extradata, codec->extradata_size);
00730             size -= cbSize;
00731         }
00732 
00733         /* It is possible for the chunk to contain garbage at the end */
00734         if (size > 0)
00735             avio_skip(pb, size);
00736     }
00737     if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
00738         /* channels and sample_rate values are those prior to applying SBR and/or PS */
00739         codec->channels    = 0;
00740         codec->sample_rate = 0;
00741     }
00742     /* override bits_per_coded_sample for G.726 */
00743     if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
00744         codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
00745 
00746     return 0;
00747 }
00748 
00749 
00750 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
00751 {
00752     enum AVCodecID id;
00753     id = ff_codec_get_id(ff_codec_wav_tags, tag);
00754     if (id <= 0)
00755         return id;
00756 
00757     if (id == AV_CODEC_ID_PCM_S16LE)
00758         id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
00759     else if (id == AV_CODEC_ID_PCM_F32LE)
00760         id = ff_get_pcm_codec_id(bps, 1, 0, 0);
00761 
00762     if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
00763         id = AV_CODEC_ID_PCM_ZORK;
00764     return id;
00765 }
00766 
00767 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
00768 {
00769     int tag1;
00770     if(esize) *esize = avio_rl32(pb);
00771     else               avio_rl32(pb);
00772     st->codec->width = avio_rl32(pb);
00773     st->codec->height = (int32_t)avio_rl32(pb);
00774     avio_rl16(pb); /* planes */
00775     st->codec->bits_per_coded_sample= avio_rl16(pb); /* depth */
00776     tag1 = avio_rl32(pb);
00777     avio_rl32(pb); /* ImageSize */
00778     avio_rl32(pb); /* XPelsPerMeter */
00779     avio_rl32(pb); /* YPelsPerMeter */
00780     avio_rl32(pb); /* ClrUsed */
00781     avio_rl32(pb); /* ClrImportant */
00782     return tag1;
00783 }
00784 
00785 void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
00786 {
00787     av_assert0(sizeof(*g) == 16); //compiler will optimize this out
00788     if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g))
00789         memset(*g, 0, sizeof(*g));
00790 }
00791 
00792 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
00793 {
00794     int i;
00795     for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) {
00796         if (!ff_guidcmp(guids[i].guid, guid))
00797             return guids[i].id;
00798     }
00799     return AV_CODEC_ID_NONE;
00800 }
00801 
00802 int ff_read_riff_info(AVFormatContext *s, int64_t size)
00803 {
00804     int64_t start, end, cur;
00805     AVIOContext *pb = s->pb;
00806 
00807     start = avio_tell(pb);
00808     end = start + size;
00809 
00810     while ((cur = avio_tell(pb)) >= 0 && cur <= end - 8 /* = tag + size */) {
00811         uint32_t chunk_code;
00812         int64_t chunk_size;
00813         char key[5] = {0};
00814         char *value;
00815 
00816         chunk_code = avio_rl32(pb);
00817         chunk_size = avio_rl32(pb);
00818 
00819         if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
00820             avio_seek(pb, -9, SEEK_CUR);
00821             chunk_code = avio_rl32(pb);
00822             chunk_size = avio_rl32(pb);
00823             if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
00824                 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
00825                 return AVERROR_INVALIDDATA;
00826             }
00827         }
00828 
00829         chunk_size += (chunk_size & 1);
00830 
00831         if (!chunk_code) {
00832             if (chunk_size)
00833                 avio_skip(pb, chunk_size);
00834             continue;
00835         }
00836 
00837         value = av_mallocz(chunk_size + 1);
00838         if (!value) {
00839             av_log(s, AV_LOG_ERROR, "out of memory, unable to read INFO tag\n");
00840             return AVERROR(ENOMEM);
00841         }
00842 
00843         AV_WL32(key, chunk_code);
00844 
00845         if (avio_read(pb, value, chunk_size) != chunk_size) {
00846             av_log(s, AV_LOG_WARNING, "premature end of file while reading INFO tag\n");
00847         }
00848 
00849         av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
00850     }
00851 
00852     return 0;
00853 }
00854 #endif // CONFIG_DEMUXERS