riff.c 32.8 KB
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/*
 * RIFF codec tags
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 * Copyright (c) 2000 Fabrice Bellard
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#include "libavutil/mathematics.h"
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#include "libavcodec/avcodec.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "riff.h"
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#include "libavcodec/bytestream.h"
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/* Note: when encoding, the first matching tag is used, so order is
   important if multiple tags possible for a given codec. */
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const AVCodecTag ff_codec_bmp_tags[] = {
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    { AV_CODEC_ID_H264,         MKTAG('H', '2', '6', '4') },
    { AV_CODEC_ID_H264,         MKTAG('h', '2', '6', '4') },
    { AV_CODEC_ID_H264,         MKTAG('X', '2', '6', '4') },
    { AV_CODEC_ID_H264,         MKTAG('x', '2', '6', '4') },
    { AV_CODEC_ID_H264,         MKTAG('a', 'v', 'c', '1') },
    { AV_CODEC_ID_H264,         MKTAG('D', 'A', 'V', 'C') },
    { AV_CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },
    { AV_CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
    { AV_CODEC_ID_H263,         MKTAG('X', '2', '6', '3') },
    { AV_CODEC_ID_H263,         MKTAG('T', '2', '6', '3') },
    { AV_CODEC_ID_H263,         MKTAG('L', '2', '6', '3') },
    { AV_CODEC_ID_H263,         MKTAG('V', 'X', '1', 'K') },
    { AV_CODEC_ID_H263,         MKTAG('Z', 'y', 'G', 'o') },
    { AV_CODEC_ID_H263,         MKTAG('M', '2', '6', '3') },
    { AV_CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },
    { AV_CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */
    { AV_CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },
    { AV_CODEC_ID_H263P,        MKTAG('U', '2', '6', '3') },
    { AV_CODEC_ID_H263P,        MKTAG('v', 'i', 'v', '1') },
    { AV_CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },
    { AV_CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },
    { AV_CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },
    { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },
    { AV_CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },
    { AV_CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },
    { AV_CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },
    { AV_CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },
    { AV_CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },
    { AV_CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
    { AV_CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
    { AV_CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },
    { AV_CODEC_ID_MPEG4,        MKTAG('W', 'A', 'W', 'V') }, /* WaWv MPEG-4 Video Codec */
    { AV_CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },
    { AV_CODEC_ID_MPEG4,        MKTAG('F', 'V', 'F', 'W') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'C', 'O', 'D') },
    { AV_CODEC_ID_MPEG4,        MKTAG('M', 'V', 'X', 'M') },
    { AV_CODEC_ID_MPEG4,        MKTAG('P', 'M', '4', 'V') },
    { AV_CODEC_ID_MPEG4,        MKTAG('S', 'M', 'P', '4') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'X', 'G', 'M') },
    { AV_CODEC_ID_MPEG4,        MKTAG('V', 'I', 'D', 'M') },
    { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'T', '3') },
    { AV_CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'X') },
    { AV_CODEC_ID_MPEG4,        MKTAG('H', 'D', 'X', '4') }, /* flipped video */
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'M', 'K', '2') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'I', 'G', 'I') },
    { AV_CODEC_ID_MPEG4,        MKTAG('I', 'N', 'M', 'C') },
    { AV_CODEC_ID_MPEG4,        MKTAG('E', 'P', 'H', 'V') }, /* Ephv MPEG-4 */
    { AV_CODEC_ID_MPEG4,        MKTAG('E', 'M', '4', 'A') },
    { AV_CODEC_ID_MPEG4,        MKTAG('M', '4', 'C', 'C') }, /* Divio MPEG-4 */
    { AV_CODEC_ID_MPEG4,        MKTAG('S', 'N', '4', '0') },
    { AV_CODEC_ID_MPEG4,        MKTAG('V', 'S', 'P', 'X') },
    { AV_CODEC_ID_MPEG4,        MKTAG('U', 'L', 'D', 'X') },
    { AV_CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'V') },
    { AV_CODEC_ID_MPEG4,        MKTAG('S', 'I', 'P', 'P') }, /* Samsung SHR-6040 */
    { AV_CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'X') },
    { AV_CODEC_ID_MPEG4,        MKTAG('D', 'r', 'e', 'X') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('D', 'V', 'X', '3') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },
    { AV_CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },
    { AV_CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },
    { AV_CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },
    { AV_CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },
    { AV_CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', '4', '1') },
    { AV_CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },
    { AV_CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
    { AV_CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */
    { AV_CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', ' ') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', 's') },
    { AV_CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },
    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },
    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('P', 'I', 'M', '2') },
    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
    { AV_CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  16) },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('L', 'M', 'P', '2') }, /* Lead MPEG2 in avi */
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('s', 'l', 'i', 'f') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('E', 'M', '2', 'V') },
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', '7', '0', '1') }, /* Matrox MPEG2 intra-only */
    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', 'v') },
    { AV_CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('d', 'm', 'b', '1') },
    { AV_CODEC_ID_MJPEG,        MKTAG('m', 'j', 'p', 'a') },
    { AV_CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
    { AV_CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
    { AV_CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'P', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
    { AV_CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },
    { AV_CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('A', 'V', 'R', 'n') },
    { AV_CODEC_ID_MJPEG,        MKTAG('A', 'C', 'D', 'V') },
    { AV_CODEC_ID_MJPEG,        MKTAG('Q', 'I', 'V', 'G') },
    { AV_CODEC_ID_MJPEG,        MKTAG('S', 'L', 'M', 'J') }, /* SL M-JPEG */
    { AV_CODEC_ID_MJPEG,        MKTAG('C', 'J', 'P', 'G') }, /* Creative Webcam JPEG */
    { AV_CODEC_ID_MJPEG,        MKTAG('I', 'J', 'L', 'V') }, /* Intel JPEG Library Video Codec */
    { AV_CODEC_ID_MJPEG,        MKTAG('M', 'V', 'J', 'P') }, /* Midvid JPEG Video Codec */
    { AV_CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '1') },
    { AV_CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '2') },
    { AV_CODEC_ID_MJPEG,        MKTAG('M', 'T', 'S', 'J') },
    { AV_CODEC_ID_MJPEG,        MKTAG('Z', 'J', 'P', 'G') }, /* Paradigm Matrix M-JPEG Codec */
    { AV_CODEC_ID_MJPEG,        MKTAG('M', 'M', 'J', 'P') },
    { AV_CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },
    { AV_CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },
    { AV_CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG( 3 ,  0 ,  0 ,  0 ) },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', '4', '2', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'N', 'V') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'V') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'Y') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('u', 'y', 'v', '1') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('2', 'V', 'u', '1') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('2', 'v', 'u', 'y') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', 's') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('P', '4', '2', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '6') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '2', '4') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', 'Y', 'U', 'Y') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', ' ', ' ') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', '1') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '1', '2') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '2', '1') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', 'B') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', 'B') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'V', '9') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
    { AV_CODEC_ID_RAWVIDEO,     MKTAG('a', 'u', 'v', '2') },
    { AV_CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },
    { AV_CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },
    { AV_CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },
    { AV_CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },
    { AV_CODEC_ID_V410,         MKTAG('v', '4', '1', '0') },
    { AV_CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },
    { AV_CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },
    { AV_CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },
    { AV_CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },
    { AV_CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },
    { AV_CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },
    { AV_CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },
    { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },
    { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },
    { AV_CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },
    { AV_CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },
    { AV_CODEC_ID_VP6F,         MKTAG('F', 'L', 'V', '4') },
    { AV_CODEC_ID_VP8,          MKTAG('V', 'P', '8', '0') },
    { AV_CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },
    { AV_CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },
    { AV_CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },
    { AV_CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },
    { AV_CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },
    { AV_CODEC_ID_MIMIC,        MKTAG('L', 'M', '2', '0') },
    { AV_CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },
    { AV_CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },
    { AV_CODEC_ID_MSRLE,        MKTAG( 2 ,  0 ,  0 ,  0 ) },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },
    { AV_CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },
    { AV_CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },
    { AV_CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },
    { AV_CODEC_ID_TRUEMOTION1,  MKTAG('P', 'V', 'E', 'Z') },
    { AV_CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },
    { AV_CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },
    { AV_CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },
    { AV_CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },
    { AV_CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },
    { AV_CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },
    { AV_CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },
    { AV_CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },
    { AV_CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },
    { AV_CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },
    { AV_CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },
    { AV_CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },
    { AV_CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },
    { AV_CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },
    { AV_CODEC_ID_WMV3IMAGE,    MKTAG('W', 'M', 'V', 'P') },
    { AV_CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },
    { AV_CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },
    { AV_CODEC_ID_VC1IMAGE,     MKTAG('W', 'V', 'P', '2') },
    { AV_CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },
    { AV_CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },
    { AV_CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },
    { AV_CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },
    { AV_CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },
    { AV_CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },
    { AV_CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },
    { AV_CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },
    { AV_CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },
    { AV_CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },
    { AV_CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },
    { AV_CODEC_ID_JPEG2000,     MKTAG('m', 'j', 'p', '2') },
    { AV_CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },
    { AV_CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'C') },
    { AV_CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'K') },
    { AV_CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },
    { AV_CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },
    { AV_CODEC_ID_PNG,          MKTAG('M', 'P', 'N', 'G') },
    { AV_CODEC_ID_PNG,          MKTAG('P', 'N', 'G', '1') },
    { AV_CODEC_ID_CLJR,         MKTAG('C', 'L', 'J', 'R') },
    { AV_CODEC_ID_DIRAC,        MKTAG('d', 'r', 'a', 'c') },
    { AV_CODEC_ID_RPZA,         MKTAG('a', 'z', 'p', 'r') },
    { AV_CODEC_ID_RPZA,         MKTAG('R', 'P', 'Z', 'A') },
    { AV_CODEC_ID_RPZA,         MKTAG('r', 'p', 'z', 'a') },
    { AV_CODEC_ID_SP5X,         MKTAG('S', 'P', '5', '4') },
    { AV_CODEC_ID_AURA,         MKTAG('A', 'U', 'R', 'A') },
    { AV_CODEC_ID_AURA2,        MKTAG('A', 'U', 'R', '2') },
    { AV_CODEC_ID_DPX,          MKTAG('d', 'p', 'x', ' ') },
    { AV_CODEC_ID_KGV1,         MKTAG('K', 'G', 'V', '1') },
    { AV_CODEC_ID_LAGARITH,     MKTAG('L', 'A', 'G', 'S') },
    { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'A') },
    { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'G') },
    { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '0') },
    { AV_CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '2') },
    { AV_CODEC_ID_VBLE,         MKTAG('V', 'B', 'L', 'E') },
    { AV_CODEC_ID_DXTORY,       MKTAG('x', 't', 'o', 'r') },
    { AV_CODEC_ID_ZEROCODEC,    MKTAG('Z', 'E', 'C', 'O') },
    { AV_CODEC_ID_MSS1,         MKTAG('M', 'S', 'S', '1') },
    { AV_CODEC_ID_MSA1,         MKTAG('M', 'S', 'A', '1') },
    { AV_CODEC_ID_TSCC2,        MKTAG('T', 'S', 'C', '2') },
    { AV_CODEC_ID_MTS2,         MKTAG('M', 'T', 'S', '2') },
    { AV_CODEC_ID_CLLC,         MKTAG('C', 'L', 'L', 'C') },
    { AV_CODEC_ID_NONE,         0 }
293 294
};

295
const AVCodecTag ff_codec_wav_tags[] = {
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343
    { AV_CODEC_ID_PCM_S16LE,       0x0001 },
    { AV_CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */
    { AV_CODEC_ID_PCM_S24LE,       0x0001 },
    { AV_CODEC_ID_PCM_S32LE,       0x0001 },
    { AV_CODEC_ID_ADPCM_MS,        0x0002 },
    { AV_CODEC_ID_PCM_F32LE,       0x0003 },
    { AV_CODEC_ID_PCM_F64LE,       0x0003 }, /* must come after f32le in this list */
    { AV_CODEC_ID_PCM_ALAW,        0x0006 },
    { AV_CODEC_ID_PCM_MULAW,       0x0007 },
    { AV_CODEC_ID_WMAVOICE,        0x000A },
    { AV_CODEC_ID_ADPCM_IMA_WAV,   0x0011 },
    { AV_CODEC_ID_PCM_ZORK,        0x0011 }, /* must come after adpcm_ima_wav in this list */
    { AV_CODEC_ID_ADPCM_YAMAHA,    0x0020 },
    { AV_CODEC_ID_TRUESPEECH,      0x0022 },
    { AV_CODEC_ID_GSM_MS,          0x0031 },
    { AV_CODEC_ID_ADPCM_G726,      0x0045 },
    { AV_CODEC_ID_MP2,             0x0050 },
    { AV_CODEC_ID_MP3,             0x0055 },
    { AV_CODEC_ID_AMR_NB,          0x0057 },
    { AV_CODEC_ID_AMR_WB,          0x0058 },
    { AV_CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */
    { AV_CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */
    { AV_CODEC_ID_ADPCM_IMA_WAV,   0x0069 },
    { AV_CODEC_ID_VOXWARE,         0x0075 },
    { AV_CODEC_ID_AAC,             0x00ff },
    { AV_CODEC_ID_SIPR,            0x0130 },
    { AV_CODEC_ID_WMAV1,           0x0160 },
    { AV_CODEC_ID_WMAV2,           0x0161 },
    { AV_CODEC_ID_WMAPRO,          0x0162 },
    { AV_CODEC_ID_WMALOSSLESS,     0x0163 },
    { AV_CODEC_ID_ADPCM_CT,        0x0200 },
    { AV_CODEC_ID_ATRAC3,          0x0270 },
    { AV_CODEC_ID_ADPCM_G722,      0x028F },
    { AV_CODEC_ID_IMC,             0x0401 },
    { AV_CODEC_ID_IAC,             0x0402 },
    { AV_CODEC_ID_GSM_MS,          0x1500 },
    { AV_CODEC_ID_TRUESPEECH,      0x1501 },
    { AV_CODEC_ID_AAC,             0x1600 }, /* ADTS AAC */
    { AV_CODEC_ID_AAC_LATM,        0x1602 },
    { AV_CODEC_ID_AC3,             0x2000 },
    { AV_CODEC_ID_DTS,             0x2001 },
    { AV_CODEC_ID_PCM_MULAW,       0x6c75 },
    { AV_CODEC_ID_AAC,             0x706d },
    { AV_CODEC_ID_AAC,             0x4143 },
    { AV_CODEC_ID_SPEEX,           0xA109 },
    { AV_CODEC_ID_FLAC,            0xF1AC },
    { AV_CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },
    { AV_CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
344 345

    /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
346
    // for NuppelVideo (nuv.c)
347 348 349 350
    { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
    { AV_CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
    { AV_CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
    { AV_CODEC_ID_NONE,      0 },
351 352
};

353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
const AVMetadataConv ff_riff_info_conv[] = {
    { "IART", "artist"    },
    { "ICMT", "comment"   },
    { "ICOP", "copyright" },
    { "ICRD", "date"      },
    { "IGNR", "genre"     },
    { "ILNG", "language"  },
    { "INAM", "title"     },
    { "IPRD", "album"     },
    { "IPRT", "track"     },
    { "ISFT", "encoder"   },
    { "ITCH", "encoded_by"},
    { 0 },
};

const char ff_riff_tags[][5] = {
    "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
    "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
    "IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH",
    {0}
};

375
#if CONFIG_MUXERS
376
int64_t ff_start_tag(AVIOContext *pb, const char *tag)
377
{
378
    ffio_wfourcc(pb, tag);
379
    avio_wl32(pb, 0);
380
    return avio_tell(pb);
381 382
}

383
void ff_end_tag(AVIOContext *pb, int64_t start)
384
{
385
    int64_t pos;
386

387
    pos = avio_tell(pb);
388
    avio_seek(pb, start - 4, SEEK_SET);
389
    avio_wl32(pb, (uint32_t)(pos - start));
390
    avio_seek(pb, pos, SEEK_SET);
391 392 393 394
}

/* WAVEFORMATEX header */
/* returns the size or -1 on error */
395
int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
396
{
397
    int bps, blkalign, bytespersec, frame_size;
398
    int hdrsize = 18;
399 400 401 402
    int waveformatextensible;
    uint8_t temp[256];
    uint8_t *riff_extradata= temp;
    uint8_t *riff_extradata_start= temp;
403

404
    if(!enc->codec_tag || enc->codec_tag > 0xffff)
405
        return -1;
406 407 408 409 410 411 412 413

    /* We use the known constant frame size for the codec if known, otherwise
       fallback to using AVCodecContext.frame_size, which is not as reliable
       for indicating packet duration */
    frame_size = av_get_audio_frame_duration(enc, 0);
    if (!frame_size)
        frame_size = enc->frame_size;

414 415 416
    waveformatextensible =   (enc->channels > 2 && enc->channel_layout)
                          || enc->sample_rate > 48000
                          || av_get_bits_per_sample(enc->codec_id) > 16;
417

418
    if (waveformatextensible) {
419
        avio_wl16(pb, 0xfffe);
420
    } else {
421
        avio_wl16(pb, enc->codec_tag);
422
    }
423 424
    avio_wl16(pb, enc->channels);
    avio_wl32(pb, enc->sample_rate);
425
    if (enc->codec_id == AV_CODEC_ID_MP2 || enc->codec_id == AV_CODEC_ID_MP3 || enc->codec_id == AV_CODEC_ID_GSM_MS) {
426 427
        bps = 0;
    } else {
428 429 430 431 432 433
        if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
            if (enc->bits_per_coded_sample)
                bps = enc->bits_per_coded_sample;
            else
                bps = 16; // default to 16
        }
434
    }
435 436
    if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){
        av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);
437
    }
438

439
    if (enc->codec_id == AV_CODEC_ID_MP2 || enc->codec_id == AV_CODEC_ID_MP3) {
440 441 442
        /* this is wrong, but it seems many demuxers do not work if this is set
           correctly */
        blkalign = frame_size;
443
        //blkalign = 144 * enc->bit_rate/enc->sample_rate;
444
    } else if (enc->codec_id == AV_CODEC_ID_AC3) {
445
            blkalign = 3840; //maximum bytes per frame
446 447 448
    } else if (enc->block_align != 0) { /* specified by the codec */
        blkalign = enc->block_align;
    } else
449
        blkalign = bps * enc->channels / av_gcd(8, bps);
450 451 452 453 454 455
    if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
        enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
        enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
        enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
        enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
        enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
456 457 458 459
        bytespersec = enc->sample_rate * blkalign;
    } else {
        bytespersec = enc->bit_rate / 8;
    }
460 461 462
    avio_wl32(pb, bytespersec); /* bytes per second */
    avio_wl16(pb, blkalign); /* block align */
    avio_wl16(pb, bps); /* bits per sample */
463
    if (enc->codec_id == AV_CODEC_ID_MP3) {
464
        hdrsize += 12;
465 466 467 468 469
        bytestream_put_le16(&riff_extradata, 1);    /* wID */
        bytestream_put_le32(&riff_extradata, 2);    /* fdwFlags */
        bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
        bytestream_put_le16(&riff_extradata, 1);    /* nFramesPerBlock */
        bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
470
    } else if (enc->codec_id == AV_CODEC_ID_MP2) {
471
        hdrsize += 22;
472 473 474 475 476 477 478 479
        bytestream_put_le16(&riff_extradata, 2);                          /* fwHeadLayer */
        bytestream_put_le32(&riff_extradata, enc->bit_rate);              /* dwHeadBitrate */
        bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
        bytestream_put_le16(&riff_extradata, 0);                          /* fwHeadModeExt */
        bytestream_put_le16(&riff_extradata, 1);                          /* wHeadEmphasis */
        bytestream_put_le16(&riff_extradata, 16);                         /* fwHeadFlags */
        bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSLow */
        bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSHigh */
480
    } else if (enc->codec_id == AV_CODEC_ID_GSM_MS || enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
481
        hdrsize += 2;
482
        bytestream_put_le16(&riff_extradata, frame_size); /* wSamplesPerBlock */
483
    } else if(enc->extradata_size){
484 485
        riff_extradata_start= enc->extradata;
        riff_extradata= enc->extradata + enc->extradata_size;
486
        hdrsize += enc->extradata_size;
487 488 489
    }
    if(waveformatextensible) {                                    /* write WAVEFORMATEXTENSIBLE extensions */
        hdrsize += 22;
490
        avio_wl16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */
491
        avio_wl16(pb, bps);                                        /* ValidBitsPerSample || SamplesPerBlock || Reserved */
492 493 494 495 496
        avio_wl32(pb, enc->channel_layout);                        /* dwChannelMask */
        avio_wl32(pb, enc->codec_tag);                             /* GUID + next 3 */
        avio_wl32(pb, 0x00100000);
        avio_wl32(pb, 0xAA000080);
        avio_wl32(pb, 0x719B3800);
497 498
    } else {
        avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
499
    }
500
    avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
501 502
    if(hdrsize&1){
        hdrsize++;
503
        avio_w8(pb, 0);
504
    }
505 506 507 508 509

    return hdrsize;
}

/* BITMAPINFOHEADER header */
510
void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
511
{
512 513
    avio_wl32(pb, 40 + enc->extradata_size); /* size */
    avio_wl32(pb, enc->width);
514
    //We always store RGB TopDown
515 516
    avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
    avio_wl16(pb, 1); /* planes */
517

518
    avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */
519
    /* compression type */
520 521 522 523 524 525
    avio_wl32(pb, enc->codec_tag);
    avio_wl32(pb, enc->width * enc->height * 3);
    avio_wl32(pb, 0);
    avio_wl32(pb, 0);
    avio_wl32(pb, 0);
    avio_wl32(pb, 0);
526

527
    avio_write(pb, enc->extradata, enc->extradata_size);
528

529
    if (!for_asf && enc->extradata_size & 1)
530
        avio_w8(pb, 0);
531 532 533
}
#endif //CONFIG_MUXERS

534
#if CONFIG_DEMUXERS
535 536 537 538 539 540 541
/* We could be given one of the three possible structures here:
 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
 * is an expansion of the previous one with the fields added
 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
 * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
 * an openended structure.
 */
542
int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
543 544 545
{
    int id;

546
    id = avio_rl16(pb);
547
    codec->codec_type = AVMEDIA_TYPE_AUDIO;
548
    codec->codec_tag = id;
549 550 551 552
    codec->channels = avio_rl16(pb);
    codec->sample_rate = avio_rl32(pb);
    codec->bit_rate = avio_rl32(pb) * 8;
    codec->block_align = avio_rl16(pb);
553
    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
554
        codec->bits_per_coded_sample = 8;
555
    }else
556
        codec->bits_per_coded_sample = avio_rl16(pb);
557
    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
558
        int cbSize = avio_rl16(pb); /* cbSize */
559 560 561
        size -= 18;
        cbSize = FFMIN(size, cbSize);
        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
562 563 564
            codec->bits_per_coded_sample = avio_rl16(pb);
            codec->channel_layout = avio_rl32(pb); /* dwChannelMask */
            id = avio_rl32(pb); /* 4 first bytes of GUID */
565
            avio_skip(pb, 12); /* skip end of GUID */
566 567 568 569 570
            cbSize -= 22;
            size -= 22;
        }
        codec->extradata_size = cbSize;
        if (cbSize > 0) {
571
            av_free(codec->extradata);
572
            codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
573 574
            if (!codec->extradata)
                return AVERROR(ENOMEM);
575
            avio_read(pb, codec->extradata, codec->extradata_size);
576 577
            size -= cbSize;
        }
578 579

        /* It is possible for the chunk to contain garbage at the end */
580
        if (size > 0)
581
            avio_skip(pb, size);
582
    }
583
    codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);
584
    if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
585 586 587 588
        /* channels and sample_rate values are those prior to applying SBR and/or PS */
        codec->channels    = 0;
        codec->sample_rate = 0;
    }
589
    /* override bits_per_coded_sample for G.726 */
590
    if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
591
        codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
592 593

    return 0;
594 595 596
}


597
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
598
{
599
    enum AVCodecID id;
600
    id = ff_codec_get_id(ff_codec_wav_tags, tag);
601 602 603
    if (id <= 0)
        return id;
    /* handle specific u8 codec */
604 605 606 607 608 609 610 611 612 613
    if (id == AV_CODEC_ID_PCM_S16LE && bps == 8)
        id = AV_CODEC_ID_PCM_U8;
    if (id == AV_CODEC_ID_PCM_S16LE && bps == 24)
        id = AV_CODEC_ID_PCM_S24LE;
    if (id == AV_CODEC_ID_PCM_S16LE && bps == 32)
        id = AV_CODEC_ID_PCM_S32LE;
    if (id == AV_CODEC_ID_PCM_F32LE && bps == 64)
        id = AV_CODEC_ID_PCM_F64LE;
    if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
        id = AV_CODEC_ID_PCM_ZORK;
614 615
    return id;
}
616

617
int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
618 619
{
    int tag1;
620 621 622 623 624 625 626 627 628 629 630
    avio_rl32(pb); /* size */
    st->codec->width = avio_rl32(pb);
    st->codec->height = (int32_t)avio_rl32(pb);
    avio_rl16(pb); /* planes */
    st->codec->bits_per_coded_sample= avio_rl16(pb); /* depth */
    tag1 = avio_rl32(pb);
    avio_rl32(pb); /* ImageSize */
    avio_rl32(pb); /* XPelsPerMeter */
    avio_rl32(pb); /* YPelsPerMeter */
    avio_rl32(pb); /* ClrUsed */
    avio_rl32(pb); /* ClrImportant */
631 632
    return tag1;
}
633 634 635 636 637
#endif // CONFIG_DEMUXERS

void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
{
    int gcd;
638 639 640 641 642 643 644 645
    int audio_frame_size;

    /* We use the known constant frame size for the codec if known, otherwise
       fallback to using AVCodecContext.frame_size, which is not as reliable
       for indicating packet duration */
    audio_frame_size = av_get_audio_frame_duration(stream, 0);
    if (!audio_frame_size)
        audio_frame_size = stream->frame_size;
646 647

    *au_ssize= stream->block_align;
648 649
    if (audio_frame_size && stream->sample_rate) {
        *au_scale = audio_frame_size;
650
        *au_rate= stream->sample_rate;
651
    }else if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
652
             stream->codec_type == AVMEDIA_TYPE_DATA ||
653
             stream->codec_type == AVMEDIA_TYPE_SUBTITLE){
654 655 656 657
        *au_scale= stream->time_base.num;
        *au_rate = stream->time_base.den;
    }else{
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
658
        *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
659
    }
660
    gcd= av_gcd(*au_scale, *au_rate);
661 662 663
    *au_scale /= gcd;
    *au_rate /= gcd;
}
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696

int ff_read_riff_info(AVFormatContext *s, int64_t size)
{
    int64_t start, end, cur;
    AVIOContext *pb = s->pb;

    start = avio_tell(pb);
    end = start + size;

    while ((cur = avio_tell(pb)) >= 0 && cur <= end - 8 /* = tag + size */) {
        uint32_t chunk_code;
        int64_t chunk_size;
        char key[5] = {0};
        char *value;

        chunk_code = avio_rl32(pb);
        chunk_size = avio_rl32(pb);
        if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
            av_log(s, AV_LOG_ERROR, "too big INFO subchunk\n");
            return AVERROR_INVALIDDATA;
        }

        chunk_size += (chunk_size & 1);

        value = av_malloc(chunk_size + 1);
        if (!value) {
            av_log(s, AV_LOG_ERROR, "out of memory, unable to read INFO tag\n");
            return AVERROR(ENOMEM);
        }

        AV_WL32(key, chunk_code);

        if (avio_read(pb, value, chunk_size) != chunk_size) {
697
            av_free(value);
698 699 700 701 702 703 704 705 706 707 708
            av_log(s, AV_LOG_ERROR, "premature end of file while reading INFO tag\n");
            return AVERROR_INVALIDDATA;
        }

        value[chunk_size] = 0;

        av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
    }

    return 0;
}