mirror of https://git.ffmpeg.org/ffmpeg.git
289 lines
9.5 KiB
C
289 lines
9.5 KiB
C
/*
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* RIFF muxing functions
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* Copyright (c) 2000 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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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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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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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 Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/dict.h"
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#include "libavutil/log.h"
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#include "libavutil/mathematics.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "riff.h"
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int64_t ff_start_tag(AVIOContext *pb, const char *tag)
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{
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ffio_wfourcc(pb, tag);
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avio_wl32(pb, 0);
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return avio_tell(pb);
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}
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void ff_end_tag(AVIOContext *pb, int64_t start)
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{
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int64_t pos;
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pos = avio_tell(pb);
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avio_seek(pb, start - 4, SEEK_SET);
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avio_wl32(pb, (uint32_t)(pos - start));
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avio_seek(pb, pos, SEEK_SET);
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}
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/* WAVEFORMATEX header */
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/* returns the size or -1 on error */
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int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb,
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AVCodecParameters *par)
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{
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int bps, blkalign, bytespersec, frame_size;
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int hdrsize = 18;
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int waveformatextensible;
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uint8_t temp[256];
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uint8_t *riff_extradata = temp;
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uint8_t *riff_extradata_start = temp;
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if (!par->codec_tag || par->codec_tag > 0xffff)
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return -1;
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/* We use the known constant frame size for the codec if known, otherwise
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* fall back on using AVCodecContext.frame_size, which is not as reliable
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* for indicating packet duration. */
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frame_size = av_get_audio_frame_duration2(par, par->block_align);
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waveformatextensible = (par->channels > 2 && par->channel_layout) ||
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par->sample_rate > 48000 ||
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av_get_bits_per_sample(par->codec_id) > 16;
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if (waveformatextensible)
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avio_wl16(pb, 0xfffe);
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else
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avio_wl16(pb, par->codec_tag);
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avio_wl16(pb, par->channels);
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avio_wl32(pb, par->sample_rate);
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if (par->codec_id == AV_CODEC_ID_MP2 ||
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par->codec_id == AV_CODEC_ID_MP3 ||
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par->codec_id == AV_CODEC_ID_GSM_MS) {
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bps = 0;
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} else {
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if (!(bps = av_get_bits_per_sample(par->codec_id))) {
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if (par->bits_per_coded_sample)
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bps = par->bits_per_coded_sample;
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else
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bps = 16; // default to 16
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}
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}
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if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
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av_log(s, AV_LOG_WARNING,
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"requested bits_per_coded_sample (%d) "
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"and actually stored (%d) differ\n",
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par->bits_per_coded_sample, bps);
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}
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if (par->codec_id == AV_CODEC_ID_MP2) {
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blkalign = frame_size;
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} else if (par->codec_id == AV_CODEC_ID_MP3) {
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blkalign = 576 * (par->sample_rate <= 24000 ? 1 : 2);
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} else if (par->codec_id == AV_CODEC_ID_AC3) {
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blkalign = 3840; /* maximum bytes per frame */
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} else if (par->block_align != 0) { /* specified by the codec */
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blkalign = par->block_align;
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} else
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blkalign = bps * par->channels / av_gcd(8, bps);
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if (par->codec_id == AV_CODEC_ID_PCM_U8 ||
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par->codec_id == AV_CODEC_ID_PCM_S24LE ||
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par->codec_id == AV_CODEC_ID_PCM_S32LE ||
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par->codec_id == AV_CODEC_ID_PCM_F32LE ||
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par->codec_id == AV_CODEC_ID_PCM_F64LE ||
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par->codec_id == AV_CODEC_ID_PCM_S16LE) {
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bytespersec = par->sample_rate * blkalign;
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} else {
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bytespersec = par->bit_rate / 8;
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}
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avio_wl32(pb, bytespersec); /* bytes per second */
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avio_wl16(pb, blkalign); /* block align */
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avio_wl16(pb, bps); /* bits per sample */
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if (par->codec_id == AV_CODEC_ID_MP3) {
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hdrsize += 12;
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bytestream_put_le16(&riff_extradata, 1); /* wID */
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bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
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bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
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bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
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bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
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} else if (par->codec_id == AV_CODEC_ID_MP2) {
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hdrsize += 22;
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/* fwHeadLayer */
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bytestream_put_le16(&riff_extradata, 2);
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/* dwHeadBitrate */
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bytestream_put_le32(&riff_extradata, par->bit_rate);
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/* fwHeadMode */
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bytestream_put_le16(&riff_extradata, par->channels == 2 ? 1 : 8);
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/* fwHeadModeExt */
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bytestream_put_le16(&riff_extradata, 0);
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/* wHeadEmphasis */
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bytestream_put_le16(&riff_extradata, 1);
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/* fwHeadFlags */
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bytestream_put_le16(&riff_extradata, 16);
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/* dwPTSLow */
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bytestream_put_le32(&riff_extradata, 0);
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/* dwPTSHigh */
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bytestream_put_le32(&riff_extradata, 0);
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} else if (par->codec_id == AV_CODEC_ID_GSM_MS ||
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par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
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hdrsize += 2;
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/* wSamplesPerBlock */
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bytestream_put_le16(&riff_extradata, frame_size);
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} else if (par->extradata_size) {
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riff_extradata_start = par->extradata;
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riff_extradata = par->extradata + par->extradata_size;
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hdrsize += par->extradata_size;
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}
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/* write WAVEFORMATEXTENSIBLE extensions */
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if (waveformatextensible) {
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hdrsize += 22;
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/* 22 is WAVEFORMATEXTENSIBLE size */
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avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
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/* ValidBitsPerSample || SamplesPerBlock || Reserved */
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avio_wl16(pb, bps);
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/* dwChannelMask */
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avio_wl32(pb, par->channel_layout);
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/* GUID + next 3 */
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avio_wl32(pb, par->codec_tag);
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avio_wl32(pb, 0x00100000);
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avio_wl32(pb, 0xAA000080);
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avio_wl32(pb, 0x719B3800);
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} else {
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avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
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}
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avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
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if (hdrsize & 1) {
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hdrsize++;
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avio_w8(pb, 0);
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}
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return hdrsize;
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}
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/* BITMAPINFOHEADER header */
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void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
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const AVCodecTag *tags, int for_asf)
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{
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/* size */
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avio_wl32(pb, 40 + par->extradata_size);
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avio_wl32(pb, par->width);
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//We always store RGB TopDown
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avio_wl32(pb, par->codec_tag ? par->height : -par->height);
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/* planes */
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avio_wl16(pb, 1);
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/* depth */
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avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24);
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/* compression type */
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avio_wl32(pb, par->codec_tag);
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avio_wl32(pb, par->width * par->height * 3);
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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avio_write(pb, par->extradata, par->extradata_size);
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if (!for_asf && par->extradata_size & 1)
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avio_w8(pb, 0);
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}
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void ff_parse_specific_params(AVStream *st, int *au_rate,
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int *au_ssize, int *au_scale)
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{
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AVCodecParameters *par = st->codecpar;
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int gcd;
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int audio_frame_size;
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audio_frame_size = av_get_audio_frame_duration2(par, 0);
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*au_ssize = par->block_align;
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if (audio_frame_size && par->sample_rate) {
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*au_scale = audio_frame_size;
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*au_rate = par->sample_rate;
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} else if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
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par->codec_type == AVMEDIA_TYPE_DATA ||
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par->codec_type == AVMEDIA_TYPE_SUBTITLE) {
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*au_scale = st->time_base.num;
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*au_rate = st->time_base.den;
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} else {
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*au_scale = par->block_align ? par->block_align * 8 : 8;
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*au_rate = par->bit_rate ? par->bit_rate :
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8 * par->sample_rate;
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}
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gcd = av_gcd(*au_scale, *au_rate);
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*au_scale /= gcd;
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*au_rate /= gcd;
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}
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void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
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{
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int len = strlen(str);
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if (len > 0) {
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len++;
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ffio_wfourcc(pb, tag);
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avio_wl32(pb, len);
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avio_put_str(pb, str);
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if (len & 1)
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avio_w8(pb, 0);
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}
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}
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static const char riff_tags[][5] = {
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"IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
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"IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
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"IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
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{ 0 }
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};
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static int riff_has_valid_tags(AVFormatContext *s)
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{
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int i;
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for (i = 0; *riff_tags[i]; i++)
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if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
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return 1;
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return 0;
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}
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void ff_riff_write_info(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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int i;
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int64_t list_pos;
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AVDictionaryEntry *t = NULL;
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ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
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/* writing empty LIST is not nice and may cause problems */
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if (!riff_has_valid_tags(s))
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return;
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list_pos = ff_start_tag(pb, "LIST");
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ffio_wfourcc(pb, "INFO");
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for (i = 0; *riff_tags[i]; i++)
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if ((t = av_dict_get(s->metadata, riff_tags[i],
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NULL, AV_DICT_MATCH_CASE)))
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ff_riff_write_info_tag(s->pb, t->key, t->value);
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ff_end_tag(pb, list_pos);
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}
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