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194be1f43e
Previously, AVStream.codec.time_base was used for that purpose, which was quite confusing for the callers. This change also opens the path for removing AVStream.codec. The change in the lavf-mkv test is due to the native timebase (1/1000) being used instead of the default one (1/90000), so the packets are now sent to the crc muxer in the same order in which they are demuxed (previously some of them got reordered because of inexact timestamp conversion).
297 lines
9.9 KiB
C
297 lines
9.9 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(AVIOContext *pb, AVCodecContext *enc)
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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 (!enc->codec_tag || enc->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_duration(enc, enc->block_align);
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if (!frame_size)
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frame_size = enc->frame_size;
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waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
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enc->sample_rate > 48000 ||
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av_get_bits_per_sample(enc->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, enc->codec_tag);
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avio_wl16(pb, enc->channels);
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avio_wl32(pb, enc->sample_rate);
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if (enc->codec_id == AV_CODEC_ID_MP2 ||
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enc->codec_id == AV_CODEC_ID_MP3 ||
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enc->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(enc->codec_id))) {
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if (enc->bits_per_coded_sample)
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bps = enc->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 != enc->bits_per_coded_sample && enc->bits_per_coded_sample) {
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av_log(enc, 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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enc->bits_per_coded_sample, bps);
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}
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if (enc->codec_id == AV_CODEC_ID_MP2 ||
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enc->codec_id == AV_CODEC_ID_MP3) {
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/* This is wrong, but it seems many demuxers do not work if this
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* is set correctly. */
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blkalign = frame_size;
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// blkalign = 144 * enc->bit_rate/enc->sample_rate;
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} else if (enc->codec_id == AV_CODEC_ID_AC3) {
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blkalign = 3840; /* maximum bytes per frame */
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} else if (enc->block_align != 0) { /* specified by the codec */
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blkalign = enc->block_align;
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} else
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blkalign = bps * enc->channels / av_gcd(8, bps);
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if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
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enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
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enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
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enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
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enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
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enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
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bytespersec = enc->sample_rate * blkalign;
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} else {
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bytespersec = enc->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 (enc->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 (enc->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, enc->bit_rate);
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/* fwHeadMode */
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bytestream_put_le16(&riff_extradata, enc->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 (enc->codec_id == AV_CODEC_ID_GSM_MS ||
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enc->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 (enc->extradata_size) {
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riff_extradata_start = enc->extradata;
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riff_extradata = enc->extradata + enc->extradata_size;
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hdrsize += enc->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, enc->channel_layout);
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/* GUID + next 3 */
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avio_wl32(pb, enc->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, AVCodecContext *enc,
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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 + enc->extradata_size);
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avio_wl32(pb, enc->width);
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//We always store RGB TopDown
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avio_wl32(pb, enc->codec_tag ? enc->height : -enc->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, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24);
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/* compression type */
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avio_wl32(pb, enc->codec_tag);
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avio_wl32(pb, enc->width * enc->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, enc->extradata, enc->extradata_size);
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if (!for_asf && enc->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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AVCodecContext *codec = st->codec;
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int gcd;
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int audio_frame_size;
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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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audio_frame_size = av_get_audio_frame_duration(codec, 0);
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if (!audio_frame_size)
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audio_frame_size = codec->frame_size;
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*au_ssize = codec->block_align;
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if (audio_frame_size && codec->sample_rate) {
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*au_scale = audio_frame_size;
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*au_rate = codec->sample_rate;
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} else if (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
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codec->codec_type == AVMEDIA_TYPE_DATA ||
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codec->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 = codec->block_align ? codec->block_align * 8 : 8;
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*au_rate = codec->bit_rate ? codec->bit_rate :
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8 * codec->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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