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ffmpeg / libavformat / riff.c @ 755bfeab

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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 "avformat.h"
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#include "avcodec.h"
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#include "riff.h"
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#include "allformats.h" // for asf_muxer
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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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    /* added based on MPlayer */
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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(0x04, 0, 0, 0) }, /* some broken avi use this */
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    /* added based on MPlayer */
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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_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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    /* added based on MPlayer */
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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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    /* added based on MPlayer */
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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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    /* added based on MPlayer */
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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_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, 0x10000001 },
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    { CODEC_ID_MPEG2VIDEO, 0x10000002 },
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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, 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_INDEO3, MKTAG('I', 'V', '3', '1') },
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    { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
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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(0x1, 0x0, 0x0, 0x0) },
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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_NONE, 0 },
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};
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const AVCodecTag codec_wav_tags[] = {
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    { CODEC_ID_MP2, 0x50 },
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    { CODEC_ID_MP3, 0x55 },
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    { CODEC_ID_AC3, 0x2000 },
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    { CODEC_ID_DTS, 0x2001 },
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    { CODEC_ID_PCM_S16LE, 0x01 },
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    { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
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    { CODEC_ID_PCM_S24LE, 0x01 },
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    { CODEC_ID_PCM_S32LE, 0x01 },
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    { CODEC_ID_PCM_ALAW, 0x06 },
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    { CODEC_ID_PCM_MULAW, 0x07 },
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    { CODEC_ID_ADPCM_MS, 0x02 },
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    { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
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    { CODEC_ID_ADPCM_YAMAHA, 0x20 },
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    { CODEC_ID_ADPCM_G726, 0x45 },
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    { CODEC_ID_ADPCM_IMA_DK4, 0x61 },  /* rogue format number */
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    { CODEC_ID_ADPCM_IMA_DK3, 0x62 },  /* rogue format number */
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    { CODEC_ID_WMAV1, 0x160 },
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    { CODEC_ID_WMAV2, 0x161 },
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    { CODEC_ID_AAC, 0x706d },
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    { CODEC_ID_AAC, 0xff },
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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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    { CODEC_ID_SONIC, 0x2048 },
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    { CODEC_ID_SONIC_LS, 0x2048 },
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    { CODEC_ID_ADPCM_CT, 0x200 },
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    { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
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    { CODEC_ID_TRUESPEECH, 0x22 },
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    { CODEC_ID_FLAC, 0xF1AC },
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    { CODEC_ID_IMC, 0x401 },
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    { CODEC_ID_GSM_MS, 0x31 },
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    { CODEC_ID_ATRAC3, 0x270 },
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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', ' ') },
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    { 0, 0 },
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};
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unsigned int codec_get_tag(const AVCodecTag *tags, int id)
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{
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    while (tags->id != CODEC_ID_NONE) {
221
        if (tags->id == id)
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            return tags->tag;
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        tags++;
224
    }
225
    return 0;
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}
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228
enum CodecID codec_get_id(const AVCodecTag *tags, unsigned int tag)
229
{
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    while (tags->id != CODEC_ID_NONE) {
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        if(   toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
232
           && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
233
           && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
234
           && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
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            return tags->id;
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        tags++;
237
    }
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    return CODEC_ID_NONE;
239
}
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241
unsigned int av_codec_get_tag(const AVCodecTag *tags[4], enum CodecID id)
242
{
243
    int i;
244
    for(i=0; tags && tags[i]; i++){
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        int tag= codec_get_tag(tags[i], id);
246
        if(tag) return tag;
247
    }
248
    return 0;
249
}
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251
enum CodecID av_codec_get_id(const AVCodecTag *tags[4], unsigned int tag)
252
{
253
    int i;
254
    for(i=0; tags && tags[i]; i++){
255
        enum CodecID id= codec_get_id(tags[i], tag);
256
        if(id!=CODEC_ID_NONE) return id;
257
    }
258
    return CODEC_ID_NONE;
259
}
260

    
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unsigned int codec_get_bmp_tag(int id)
262
{
263
    return codec_get_tag(codec_bmp_tags, id);
264
}
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unsigned int codec_get_wav_tag(int id)
267
{
268
    return codec_get_tag(codec_wav_tags, id);
269
}
270

    
271
enum CodecID codec_get_bmp_id(unsigned int tag)
272
{
273
    return codec_get_id(codec_bmp_tags, tag);
274
}
275

    
276
enum CodecID codec_get_wav_id(unsigned int tag)
277
{
278
    return codec_get_id(codec_wav_tags, tag);
279
}
280

    
281
#ifdef CONFIG_MUXERS
282
offset_t start_tag(ByteIOContext *pb, const char *tag)
283
{
284
    put_tag(pb, tag);
285
    put_le32(pb, 0);
286
    return url_ftell(pb);
287
}
288

    
289
void end_tag(ByteIOContext *pb, offset_t start)
290
{
291
    offset_t pos;
292

    
293
    pos = url_ftell(pb);
294
    url_fseek(pb, start - 4, SEEK_SET);
295
    put_le32(pb, (uint32_t)(pos - start));
296
    url_fseek(pb, pos, SEEK_SET);
297
}
298

    
299
/* WAVEFORMATEX header */
300
/* returns the size or -1 on error */
301
int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
302
{
303
    int bps, blkalign, bytespersec;
304
    int hdrsize = 18;
305

    
306
    if(!enc->codec_tag || enc->codec_tag > 0xffff)
307
        return -1;
308

    
309
    put_le16(pb, enc->codec_tag);
310
    put_le16(pb, enc->channels);
311
    put_le32(pb, enc->sample_rate);
312
    if (enc->codec_id == CODEC_ID_PCM_U8 ||
313
        enc->codec_id == CODEC_ID_PCM_ALAW ||
314
        enc->codec_id == CODEC_ID_PCM_MULAW) {
315
        bps = 8;
316
    } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
317
        bps = 0;
318
    } 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) { //
319
        bps = 4;
320
    } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
321
        bps = 24;
322
    } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
323
        bps = 32;
324
    } else {
325
        bps = 16;
326
    }
327
    if(bps != enc->bits_per_sample && enc->bits_per_sample){
328
        av_log(enc, AV_LOG_WARNING, "requested bits_per_sample (%d) and actually stored (%d) differ\n", enc->bits_per_sample, bps);
329
    }
330

    
331
    if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
332
        blkalign = enc->frame_size; //this is wrong, but it seems many demuxers do not work if this is set correctly
333
        //blkalign = 144 * enc->bit_rate/enc->sample_rate;
334
    } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
335
        blkalign = 1;
336
    } else if (enc->block_align != 0) { /* specified by the codec */
337
        blkalign = enc->block_align;
338
    } else
339
        blkalign = enc->channels*bps >> 3;
340
    if (enc->codec_id == CODEC_ID_PCM_U8 ||
341
        enc->codec_id == CODEC_ID_PCM_S24LE ||
342
        enc->codec_id == CODEC_ID_PCM_S32LE ||
343
        enc->codec_id == CODEC_ID_PCM_S16LE) {
344
        bytespersec = enc->sample_rate * blkalign;
345
    } else {
346
        bytespersec = enc->bit_rate / 8;
347
    }
348
    put_le32(pb, bytespersec); /* bytes per second */
349
    put_le16(pb, blkalign); /* block align */
350
    put_le16(pb, bps); /* bits per sample */
351
    if (enc->codec_id == CODEC_ID_MP3) {
352
        put_le16(pb, 12); /* wav_extra_size */
353
        hdrsize += 12;
354
        put_le16(pb, 1); /* wID */
355
        put_le32(pb, 2); /* fdwFlags */
356
        put_le16(pb, 1152); /* nBlockSize */
357
        put_le16(pb, 1); /* nFramesPerBlock */
358
        put_le16(pb, 1393); /* nCodecDelay */
359
    } else if (enc->codec_id == CODEC_ID_MP2) {
360
        put_le16(pb, 22); /* wav_extra_size */
361
        hdrsize += 22;
362
        put_le16(pb, 2);  /* fwHeadLayer */
363
        put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
364
        put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
365
        put_le16(pb, 0);  /* fwHeadModeExt */
366
        put_le16(pb, 1);  /* wHeadEmphasis */
367
        put_le16(pb, 16); /* fwHeadFlags */
368
        put_le32(pb, 0);  /* dwPTSLow */
369
        put_le32(pb, 0);  /* dwPTSHigh */
370
    } else if (enc->codec_id == CODEC_ID_GSM_MS) {
371
        put_le16(pb, 2); /* wav_extra_size */
372
        hdrsize += 2;
373
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
374
    } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
375
        put_le16(pb, 2); /* wav_extra_size */
376
        hdrsize += 2;
377
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
378
    } else if(enc->extradata_size){
379
        put_le16(pb, enc->extradata_size);
380
        put_buffer(pb, enc->extradata, enc->extradata_size);
381
        hdrsize += enc->extradata_size;
382
        if(hdrsize&1){
383
            hdrsize++;
384
            put_byte(pb, 0);
385
        }
386
    } else {
387
        hdrsize -= 2;
388
    }
389

    
390
    return hdrsize;
391
}
392

    
393
/* BITMAPINFOHEADER header */
394
void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
395
{
396
    put_le32(pb, 40 + enc->extradata_size); /* size */
397
    put_le32(pb, enc->width);
398
    put_le32(pb, enc->height);
399
    put_le16(pb, 1); /* planes */
400

    
401
    put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
402
    /* compression type */
403
    put_le32(pb, enc->codec_tag);
404
    put_le32(pb, enc->width * enc->height * 3);
405
    put_le32(pb, 0);
406
    put_le32(pb, 0);
407
    put_le32(pb, 0);
408
    put_le32(pb, 0);
409

    
410
    put_buffer(pb, enc->extradata, enc->extradata_size);
411

    
412
    if (enc->extradata_size & 1)
413
        put_byte(pb, 0);
414
}
415
#endif //CONFIG_MUXERS
416

    
417
#ifdef CONFIG_DEMUXERS
418
/* We could be given one of the three possible structures here:
419
 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
420
 * is an expansion of the previous one with the fields added
421
 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
422
 * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
423
 * an openended structure.
424
 */
425
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
426
{
427
    int id;
428

    
429
    id = get_le16(pb);
430
    codec->codec_type = CODEC_TYPE_AUDIO;
431
    codec->codec_tag = id;
432
    codec->channels = get_le16(pb);
433
    codec->sample_rate = get_le32(pb);
434
    codec->bit_rate = get_le32(pb) * 8;
435
    codec->block_align = get_le16(pb);
436
    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
437
        codec->bits_per_sample = 8;
438
    }else
439
        codec->bits_per_sample = get_le16(pb);
440
    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
441
        int cbSize = get_le16(pb); /* cbSize */
442
        size -= 18;
443
        cbSize = FFMIN(size, cbSize);
444
        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
445
            codec->bits_per_sample = get_le16(pb);
446
            get_le32(pb); /* dwChannelMask */
447
            id = get_le32(pb); /* 4 first bytes of GUID */
448
            url_fskip(pb, 12); /* skip end of GUID */
449
            cbSize -= 22;
450
            size -= 22;
451
        }
452
        codec->extradata_size = cbSize;
453
        if (cbSize > 0) {
454
            codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
455
            get_buffer(pb, codec->extradata, codec->extradata_size);
456
            size -= cbSize;
457
        }
458

    
459
        /* It is possible for the chunk to contain garbage at the end */
460
        if (size > 0)
461
            url_fskip(pb, size);
462
    }
463
    codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
464
}
465

    
466

    
467
int wav_codec_get_id(unsigned int tag, int bps)
468
{
469
    int id;
470
    id = codec_get_id(codec_wav_tags, tag);
471
    if (id <= 0)
472
        return id;
473
    /* handle specific u8 codec */
474
    if (id == CODEC_ID_PCM_S16LE && bps == 8)
475
        id = CODEC_ID_PCM_U8;
476
    if (id == CODEC_ID_PCM_S16LE && bps == 24)
477
        id = CODEC_ID_PCM_S24LE;
478
    if (id == CODEC_ID_PCM_S16LE && bps == 32)
479
        id = CODEC_ID_PCM_S32LE;
480
    return id;
481
}
482
#endif // CONFIG_DEMUXERS
483

    
484
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
485
{
486
    int gcd;
487

    
488
    *au_ssize= stream->block_align;
489
    if(stream->frame_size && stream->sample_rate){
490
        *au_scale=stream->frame_size;
491
        *au_rate= stream->sample_rate;
492
    }else if(stream->codec_type == CODEC_TYPE_VIDEO){
493
        *au_scale= stream->time_base.num;
494
        *au_rate = stream->time_base.den;
495
    }else{
496
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
497
        *au_rate = stream->bit_rate;
498
    }
499
    gcd= ff_gcd(*au_scale, *au_rate);
500
    *au_scale /= gcd;
501
    *au_rate /= gcd;
502
}