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ffmpeg / libavformat / riff.c @ 91aeec1b

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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_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_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_JPEGLS, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
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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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    /* 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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{
218
    while (tags->id != CODEC_ID_NONE) {
219
        if (tags->id == id)
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            return tags->tag;
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        tags++;
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    }
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    return 0;
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}
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enum CodecID codec_get_id(const AVCodecTag *tags, unsigned int tag)
227
{
228
    while (tags->id != CODEC_ID_NONE) {
229
        if(   toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
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           && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
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           && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
232
           && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
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            return tags->id;
234
        tags++;
235
    }
236
    return CODEC_ID_NONE;
237
}
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unsigned int av_codec_get_tag(const AVCodecTag *tags[4], enum CodecID id)
240
{
241
    int i;
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    for(i=0; tags && tags[i]; i++){
243
        int tag= codec_get_tag(tags[i], id);
244
        if(tag) return tag;
245
    }
246
    return 0;
247
}
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enum CodecID av_codec_get_id(const AVCodecTag *tags[4], unsigned int tag)
250
{
251
    int i;
252
    for(i=0; tags && tags[i]; i++){
253
        enum CodecID id= codec_get_id(tags[i], tag);
254
        if(id!=CODEC_ID_NONE) return id;
255
    }
256
    return CODEC_ID_NONE;
257
}
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unsigned int codec_get_bmp_tag(int id)
260
{
261
    return codec_get_tag(codec_bmp_tags, id);
262
}
263

    
264
unsigned int codec_get_wav_tag(int id)
265
{
266
    return codec_get_tag(codec_wav_tags, id);
267
}
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269
enum CodecID codec_get_bmp_id(unsigned int tag)
270
{
271
    return codec_get_id(codec_bmp_tags, tag);
272
}
273

    
274
enum CodecID codec_get_wav_id(unsigned int tag)
275
{
276
    return codec_get_id(codec_wav_tags, tag);
277
}
278

    
279
#ifdef CONFIG_MUXERS
280
offset_t start_tag(ByteIOContext *pb, const char *tag)
281
{
282
    put_tag(pb, tag);
283
    put_le32(pb, 0);
284
    return url_ftell(pb);
285
}
286

    
287
void end_tag(ByteIOContext *pb, offset_t start)
288
{
289
    offset_t pos;
290

    
291
    pos = url_ftell(pb);
292
    url_fseek(pb, start - 4, SEEK_SET);
293
    put_le32(pb, (uint32_t)(pos - start));
294
    url_fseek(pb, pos, SEEK_SET);
295
}
296

    
297
/* WAVEFORMATEX header */
298
/* returns the size or -1 on error */
299
int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
300
{
301
    int bps, blkalign, bytespersec;
302
    int hdrsize = 18;
303

    
304
    if(!enc->codec_tag || enc->codec_tag > 0xffff)
305
        return -1;
306

    
307
    put_le16(pb, enc->codec_tag);
308
    put_le16(pb, enc->channels);
309
    put_le32(pb, enc->sample_rate);
310
    if (enc->codec_id == CODEC_ID_PCM_U8 ||
311
        enc->codec_id == CODEC_ID_PCM_ALAW ||
312
        enc->codec_id == CODEC_ID_PCM_MULAW) {
313
        bps = 8;
314
    } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
315
        bps = 0;
316
    } 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) { //
317
        bps = 4;
318
    } else if (enc->codec_id == CODEC_ID_PCM_S24LE) {
319
        bps = 24;
320
    } else if (enc->codec_id == CODEC_ID_PCM_S32LE) {
321
        bps = 32;
322
    } else {
323
        bps = 16;
324
    }
325
    if(bps != enc->bits_per_sample && enc->bits_per_sample){
326
        av_log(enc, AV_LOG_WARNING, "requested bits_per_sample (%d) and actually stored (%d) differ\n", enc->bits_per_sample, bps);
327
    }
328

    
329
    if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
330
        blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
331
        //blkalign = 144 * enc->bit_rate/enc->sample_rate;
332
    } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
333
        blkalign = 1;
334
    } else if (enc->block_align != 0) { /* specified by the codec */
335
        blkalign = enc->block_align;
336
    } else
337
        blkalign = enc->channels*bps >> 3;
338
    if (enc->codec_id == CODEC_ID_PCM_U8 ||
339
        enc->codec_id == CODEC_ID_PCM_S24LE ||
340
        enc->codec_id == CODEC_ID_PCM_S32LE ||
341
        enc->codec_id == CODEC_ID_PCM_S16LE) {
342
        bytespersec = enc->sample_rate * blkalign;
343
    } else {
344
        bytespersec = enc->bit_rate / 8;
345
    }
346
    put_le32(pb, bytespersec); /* bytes per second */
347
    put_le16(pb, blkalign); /* block align */
348
    put_le16(pb, bps); /* bits per sample */
349
    if (enc->codec_id == CODEC_ID_MP3) {
350
        put_le16(pb, 12); /* wav_extra_size */
351
        hdrsize += 12;
352
        put_le16(pb, 1); /* wID */
353
        put_le32(pb, 2); /* fdwFlags */
354
        put_le16(pb, 1152); /* nBlockSize */
355
        put_le16(pb, 1); /* nFramesPerBlock */
356
        put_le16(pb, 1393); /* nCodecDelay */
357
    } else if (enc->codec_id == CODEC_ID_MP2) {
358
        put_le16(pb, 22); /* wav_extra_size */
359
        hdrsize += 22;
360
        put_le16(pb, 2);  /* fwHeadLayer */
361
        put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
362
        put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
363
        put_le16(pb, 0);  /* fwHeadModeExt */
364
        put_le16(pb, 1);  /* wHeadEmphasis */
365
        put_le16(pb, 16); /* fwHeadFlags */
366
        put_le32(pb, 0);  /* dwPTSLow */
367
        put_le32(pb, 0);  /* dwPTSHigh */
368
    } else if (enc->codec_id == CODEC_ID_GSM_MS) {
369
        put_le16(pb, 2); /* wav_extra_size */
370
        hdrsize += 2;
371
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
372
    } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
373
        put_le16(pb, 2); /* wav_extra_size */
374
        hdrsize += 2;
375
        put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
376
    } else if(enc->extradata_size){
377
        put_le16(pb, enc->extradata_size);
378
        put_buffer(pb, enc->extradata, enc->extradata_size);
379
        hdrsize += enc->extradata_size;
380
        if(hdrsize&1){
381
            hdrsize++;
382
            put_byte(pb, 0);
383
        }
384
    } else {
385
        hdrsize -= 2;
386
    }
387

    
388
    return hdrsize;
389
}
390

    
391
/* BITMAPINFOHEADER header */
392
void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
393
{
394
    put_le32(pb, 40 + enc->extradata_size); /* size */
395
    put_le32(pb, enc->width);
396
    put_le32(pb, enc->height);
397
    put_le16(pb, 1); /* planes */
398

    
399
    put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
400
    /* compression type */
401
    put_le32(pb, enc->codec_tag);
402
    put_le32(pb, enc->width * enc->height * 3);
403
    put_le32(pb, 0);
404
    put_le32(pb, 0);
405
    put_le32(pb, 0);
406
    put_le32(pb, 0);
407

    
408
    put_buffer(pb, enc->extradata, enc->extradata_size);
409

    
410
    if (enc->extradata_size & 1)
411
        put_byte(pb, 0);
412
}
413
#endif //CONFIG_MUXERS
414

    
415
#ifdef CONFIG_DEMUXERS
416
/* We could be given one of the three possible structures here:
417
 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
418
 * is an expansion of the previous one with the fields added
419
 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
420
 * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
421
 * an openended structure.
422
 */
423
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
424
{
425
    int id;
426

    
427
    id = get_le16(pb);
428
    codec->codec_type = CODEC_TYPE_AUDIO;
429
    codec->codec_tag = id;
430
    codec->channels = get_le16(pb);
431
    codec->sample_rate = get_le32(pb);
432
    codec->bit_rate = get_le32(pb) * 8;
433
    codec->block_align = get_le16(pb);
434
    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
435
        codec->bits_per_sample = 8;
436
    }else
437
        codec->bits_per_sample = get_le16(pb);
438
    if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
439
        int cbSize = get_le16(pb); /* cbSize */
440
        size -= 18;
441
        cbSize = FFMIN(size, cbSize);
442
        if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
443
            codec->bits_per_sample = get_le16(pb);
444
            get_le32(pb); /* dwChannelMask */
445
            id = get_le32(pb); /* 4 first bytes of GUID */
446
            url_fskip(pb, 12); /* skip end of GUID */
447
            cbSize -= 22;
448
            size -= 22;
449
        }
450
        codec->extradata_size = cbSize;
451
        if (cbSize > 0) {
452
            codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
453
            get_buffer(pb, codec->extradata, codec->extradata_size);
454
            size -= cbSize;
455
        }
456

    
457
        /* It is possible for the chunk to contain garbage at the end */
458
        if (size > 0)
459
            url_fskip(pb, size);
460
    }
461
    codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
462
}
463

    
464

    
465
int wav_codec_get_id(unsigned int tag, int bps)
466
{
467
    int id;
468
    id = codec_get_id(codec_wav_tags, tag);
469
    if (id <= 0)
470
        return id;
471
    /* handle specific u8 codec */
472
    if (id == CODEC_ID_PCM_S16LE && bps == 8)
473
        id = CODEC_ID_PCM_U8;
474
    if (id == CODEC_ID_PCM_S16LE && bps == 24)
475
        id = CODEC_ID_PCM_S24LE;
476
    if (id == CODEC_ID_PCM_S16LE && bps == 32)
477
        id = CODEC_ID_PCM_S32LE;
478
    return id;
479
}
480
#endif // CONFIG_DEMUXERS
481

    
482
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
483
{
484
    int gcd;
485

    
486
    *au_ssize= stream->block_align;
487
    if(stream->frame_size && stream->sample_rate){
488
        *au_scale=stream->frame_size;
489
        *au_rate= stream->sample_rate;
490
    }else if(stream->codec_type == CODEC_TYPE_VIDEO){
491
        *au_scale= stream->time_base.num;
492
        *au_rate = stream->time_base.den;
493
    }else{
494
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
495
        *au_rate = stream->bit_rate;
496
    }
497
    gcd= ff_gcd(*au_scale, *au_rate);
498
    *au_scale /= gcd;
499
    *au_rate /= gcd;
500
}