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ffmpeg / libavformat / riff.c @ b8cf645b

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1
/*
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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 FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * 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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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; 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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 */
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#include "libavcodec/avcodec.h"
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#include "avformat.h"
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#include "riff.h"
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/* Note: when encoding, the first matching tag is used, so order is
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   important if multiple tags possible for a given codec. */
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const AVCodecTag codec_bmp_tags[] = {
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    { CODEC_ID_H264,         MKTAG('H', '2', '6', '4') },
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    { CODEC_ID_H264,         MKTAG('h', '2', '6', '4') },
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    { CODEC_ID_H264,         MKTAG('X', '2', '6', '4') },
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    { CODEC_ID_H264,         MKTAG('x', '2', '6', '4') },
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    { CODEC_ID_H264,         MKTAG('a', 'v', 'c', '1') },
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    { CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },
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    { CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
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    { CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },
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    { CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */
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    { CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },
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    { CODEC_ID_H263P,        MKTAG('U', '2', '6', '3') },
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    { CODEC_ID_H263P,        MKTAG('v', 'i', 'v', '1') },
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    { CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },
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    { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },
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    { CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },
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    { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },
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    { CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },
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    { CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },
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    { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */
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    { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },
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    { CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },
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    { CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },
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    { CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },
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    { CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },
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    { CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
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    { CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
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    { CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },
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    { CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },
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    { CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'X') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
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    { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },
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    { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },
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    { CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },
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    { CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },
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    { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },
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    { CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },
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    { CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },
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    { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },
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    { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },
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    { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },
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    { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },
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    { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
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    { CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
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    { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },
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    { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },
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    { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },
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    { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
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    { CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
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    { CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
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    { CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
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    { CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
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    { CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },
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    { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },
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    { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },
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    { CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },
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    { CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },
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    { CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
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    { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
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    { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
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    { CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },
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    { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },
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    { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'R', 'n') },
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    { CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },
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    { CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },
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    { CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },
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    { CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },
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    { CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },
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    { CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },
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    { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },
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    { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },
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    { CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },
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    { CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },
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    { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },
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    { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },
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    { CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },
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    { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },
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    { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },
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    { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },
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    { CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },
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    { CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },
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    { CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },
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    { CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },
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    { CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },
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    { CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },
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    { CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },
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    { CODEC_ID_MSRLE,        MKTAG( 2 ,  0 ,  0 ,  0 ) },
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    { CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },
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    { CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },
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    { CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },
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    { CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },
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    { CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },
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    { CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },
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    { CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },
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    { CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },
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    { CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },
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    { CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },
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    { CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },
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    { CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },
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    { CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },
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    { CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },
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    { CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },
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    { CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },
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    { CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },
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    { CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },
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    { CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },
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    { CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },
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    { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },
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    { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },
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    { CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },
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    { CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },
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    { CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },
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    { CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },
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    { CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },
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    { CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },
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    { CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },
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    { CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },
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    { CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },
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    { CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },
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    { CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },
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    { CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },
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    { CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },
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    { CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },
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    { CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },
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    { CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },
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    { CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },
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    { CODEC_ID_CLJR,         MKTAG('c', 'l', 'j', 'r') },
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    { CODEC_ID_DIRAC,        MKTAG('d', 'r', 'a', 'c') },
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    { CODEC_ID_NONE,         0 }
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};
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const AVCodecTag codec_wav_tags[] = {
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    { CODEC_ID_PCM_S16LE,       0x0001 },
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    { CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */
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    { CODEC_ID_PCM_S24LE,       0x0001 },
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    { CODEC_ID_PCM_S32LE,       0x0001 },
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    { CODEC_ID_ADPCM_MS,        0x0002 },
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    { CODEC_ID_PCM_F32LE,       0x0003 },
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    { CODEC_ID_PCM_F64LE,       0x0003 }, /* must come after f32le in this list */
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    { CODEC_ID_PCM_ALAW,        0x0006 },
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    { CODEC_ID_PCM_MULAW,       0x0007 },
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    { CODEC_ID_WMAVOICE,        0x000A },
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    { CODEC_ID_ADPCM_IMA_WAV,   0x0011 },
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    { CODEC_ID_PCM_ZORK,        0x0011 }, /* must come after adpcm_ima_wav in this list */
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    { CODEC_ID_ADPCM_YAMAHA,    0x0020 },
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    { CODEC_ID_TRUESPEECH,      0x0022 },
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    { CODEC_ID_GSM_MS,          0x0031 },
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    { CODEC_ID_ADPCM_G726,      0x0045 },
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    { CODEC_ID_MP2,             0x0050 },
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    { CODEC_ID_MP3,             0x0055 },
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    { CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */
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    { CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */
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    { CODEC_ID_VOXWARE,         0x0075 },
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    { CODEC_ID_AAC,             0x00ff },
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    { CODEC_ID_SIPR,            0x0130 },
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    { CODEC_ID_WMAV1,           0x0160 },
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    { CODEC_ID_WMAV2,           0x0161 },
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    { CODEC_ID_WMAPRO,          0x0162 },
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    { CODEC_ID_WMALOSSLESS,     0x0163 },
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    { CODEC_ID_ADPCM_CT,        0x0200 },
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    { CODEC_ID_ATRAC3,          0x0270 },
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    { CODEC_ID_IMC,             0x0401 },
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    { CODEC_ID_AC3,             0x2000 },
203
    { CODEC_ID_DTS,             0x2001 },
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    { CODEC_ID_SONIC,           0x2048 },
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    { CODEC_ID_SONIC_LS,        0x2048 },
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    { CODEC_ID_AAC,             0x706d },
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    { CODEC_ID_FLAC,            0xF1AC },
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    { CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },
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    { CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
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    /* FIXME: All of the IDs below are not 16 bit and thus illegal. */
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    // for NuppelVideo (nuv.c)
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    { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
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    { CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
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    { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
216
    { 0, 0 },
217
};
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219
#ifdef CONFIG_MUXERS
220
int64_t start_tag(ByteIOContext *pb, const char *tag)
221
{
222
    put_tag(pb, tag);
223
    put_le32(pb, 0);
224
    return url_ftell(pb);
225
}
226

    
227
void end_tag(ByteIOContext *pb, int64_t start)
228
{
229
    int64_t pos;
230

    
231
    pos = url_ftell(pb);
232
    url_fseek(pb, start - 4, SEEK_SET);
233
    put_le32(pb, (uint32_t)(pos - start));
234
    url_fseek(pb, pos, SEEK_SET);
235
}
236

    
237
/* WAVEFORMATEX header */
238
/* returns the size or -1 on error */
239
int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
240
{
241
    int bps, blkalign, bytespersec;
242
    int hdrsize = 18;
243

    
244
    if(!enc->codec_tag || enc->codec_tag > 0xffff)
245
        return -1;
246

    
247
    put_le16(pb, enc->codec_tag);
248
    put_le16(pb, enc->channels);
249
    put_le32(pb, enc->sample_rate);
250
    if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
251
        bps = 0;
252
    } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS || enc->codec_id == CODEC_ID_ADPCM_G726 || enc->codec_id == CODEC_ID_ADPCM_YAMAHA) { //
253
        bps = 4;
254
    } else {
255
        if (!(bps = av_get_bits_per_sample(enc->codec_id)))
256
            bps = 16; // default to 16
257
    }
258
    if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){
259
        av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);
260
    }
261

    
262
    if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_AC3) {
263
        blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
264
        //blkalign = 144 * enc->bit_rate/enc->sample_rate;
265
    } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
266
        blkalign = 1;
267
    } else if (enc->block_align != 0) { /* specified by the codec */
268
        blkalign = enc->block_align;
269
    } else
270
        blkalign = enc->channels*bps >> 3;
271
    if (enc->codec_id == CODEC_ID_PCM_U8 ||
272
        enc->codec_id == CODEC_ID_PCM_S24LE ||
273
        enc->codec_id == CODEC_ID_PCM_S32LE ||
274
        enc->codec_id == CODEC_ID_PCM_F32LE ||
275
        enc->codec_id == CODEC_ID_PCM_F64LE ||
276
        enc->codec_id == CODEC_ID_PCM_S16LE) {
277
        bytespersec = enc->sample_rate * blkalign;
278
    } else {
279
        bytespersec = enc->bit_rate / 8;
280
    }
281
    put_le32(pb, bytespersec); /* bytes per second */
282
    put_le16(pb, blkalign); /* block align */
283
    put_le16(pb, bps); /* bits per sample */
284
    if (enc->codec_id == CODEC_ID_MP3) {
285
        put_le16(pb, 12); /* wav_extra_size */
286
        hdrsize += 12;
287
        put_le16(pb, 1); /* wID */
288
        put_le32(pb, 2); /* fdwFlags */
289
        put_le16(pb, 1152); /* nBlockSize */
290
        put_le16(pb, 1); /* nFramesPerBlock */
291
        put_le16(pb, 1393); /* nCodecDelay */
292
    } else if (enc->codec_id == CODEC_ID_MP2) {
293
        put_le16(pb, 22); /* wav_extra_size */
294
        hdrsize += 22;
295
        put_le16(pb, 2);  /* fwHeadLayer */
296
        put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
297
        put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
298
        put_le16(pb, 0);  /* fwHeadModeExt */
299
        put_le16(pb, 1);  /* wHeadEmphasis */
300
        put_le16(pb, 16); /* fwHeadFlags */
301
        put_le32(pb, 0);  /* dwPTSLow */
302
        put_le32(pb, 0);  /* dwPTSHigh */
303
    } else if (enc->codec_id == CODEC_ID_GSM_MS) {
304
        put_le16(pb, 2); /* wav_extra_size */
305
        hdrsize += 2;
306
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
307
    } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
308
        put_le16(pb, 2); /* wav_extra_size */
309
        hdrsize += 2;
310
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
311
    } else if(enc->extradata_size){
312
        put_le16(pb, enc->extradata_size);
313
        put_buffer(pb, enc->extradata, enc->extradata_size);
314
        hdrsize += enc->extradata_size;
315
        if(hdrsize&1){
316
            hdrsize++;
317
            put_byte(pb, 0);
318
        }
319
    } else {
320
        hdrsize -= 2;
321
    }
322

    
323
    return hdrsize;
324
}
325

    
326
/* BITMAPINFOHEADER header */
327
void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
328
{
329
    put_le32(pb, 40 + enc->extradata_size); /* size */
330
    put_le32(pb, enc->width);
331
    put_le32(pb, enc->height);
332
    put_le16(pb, 1); /* planes */
333

    
334
    put_le16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */
335
    /* compression type */
336
    put_le32(pb, enc->codec_tag);
337
    put_le32(pb, enc->width * enc->height * 3);
338
    put_le32(pb, 0);
339
    put_le32(pb, 0);
340
    put_le32(pb, 0);
341
    put_le32(pb, 0);
342

    
343
    put_buffer(pb, enc->extradata, enc->extradata_size);
344

    
345
    if (enc->extradata_size & 1)
346
        put_byte(pb, 0);
347
}
348
#endif //CONFIG_MUXERS
349

    
350
#ifdef CONFIG_DEMUXERS
351
/* We could be given one of the three possible structures here:
352
 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
353
 * is an expansion of the previous one with the fields added
354
 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
355
 * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
356
 * an openended structure.
357
 */
358
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
359
{
360
    int id;
361

    
362
    id = get_le16(pb);
363
    codec->codec_type = CODEC_TYPE_AUDIO;
364
    codec->codec_tag = id;
365
    codec->channels = get_le16(pb);
366
    codec->sample_rate = get_le32(pb);
367
    codec->bit_rate = get_le32(pb) * 8;
368
    codec->block_align = get_le16(pb);
369
    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
370
        codec->bits_per_coded_sample = 8;
371
    }else
372
        codec->bits_per_coded_sample = get_le16(pb);
373
    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
374
        int cbSize = get_le16(pb); /* cbSize */
375
        size -= 18;
376
        cbSize = FFMIN(size, cbSize);
377
        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
378
            codec->bits_per_coded_sample = get_le16(pb);
379
            codec->channel_layout = get_le32(pb); /* dwChannelMask */
380
            id = get_le32(pb); /* 4 first bytes of GUID */
381
            url_fskip(pb, 12); /* skip end of GUID */
382
            cbSize -= 22;
383
            size -= 22;
384
        }
385
        codec->extradata_size = cbSize;
386
        if (cbSize > 0) {
387
            codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
388
            get_buffer(pb, codec->extradata, codec->extradata_size);
389
            size -= cbSize;
390
        }
391

    
392
        /* It is possible for the chunk to contain garbage at the end */
393
        if (size > 0)
394
            url_fskip(pb, size);
395
    }
396
    codec->codec_id = wav_codec_get_id(id, codec->bits_per_coded_sample);
397
}
398

    
399

    
400
int wav_codec_get_id(unsigned int tag, int bps)
401
{
402
    int id;
403
    id = codec_get_id(codec_wav_tags, tag);
404
    if (id <= 0)
405
        return id;
406
    /* handle specific u8 codec */
407
    if (id == CODEC_ID_PCM_S16LE && bps == 8)
408
        id = CODEC_ID_PCM_U8;
409
    if (id == CODEC_ID_PCM_S16LE && bps == 24)
410
        id = CODEC_ID_PCM_S24LE;
411
    if (id == CODEC_ID_PCM_S16LE && bps == 32)
412
        id = CODEC_ID_PCM_S32LE;
413
    if (id == CODEC_ID_PCM_F32LE && bps == 64)
414
        id = CODEC_ID_PCM_F64LE;
415
    if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)
416
        id = CODEC_ID_PCM_ZORK;
417
    return id;
418
}
419
#endif // CONFIG_DEMUXERS
420

    
421
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
422
{
423
    int gcd;
424

    
425
    *au_ssize= stream->block_align;
426
    if(stream->frame_size && stream->sample_rate){
427
        *au_scale=stream->frame_size;
428
        *au_rate= stream->sample_rate;
429
    }else if(stream->codec_type == CODEC_TYPE_VIDEO){
430
        *au_scale= stream->time_base.num;
431
        *au_rate = stream->time_base.den;
432
    }else{
433
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
434
        *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
435
    }
436
    gcd= ff_gcd(*au_scale, *au_rate);
437
    *au_scale /= gcd;
438
    *au_rate /= gcd;
439
}