mirror of https://git.ffmpeg.org/ffmpeg.git
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
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/*
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* WavPack muxer
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* Copyright (c) 2012 Paul B Mahol
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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 "internal.h"
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#include "avio_internal.h"
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typedef struct{
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uint32_t duration;
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int off;
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} WVMuxContext;
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static int write_header(AVFormatContext *s)
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{
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WVMuxContext *wc = s->priv_data;
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AVCodecContext *codec = s->streams[0]->codec;
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if (s->nb_streams > 1) {
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av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
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return AVERROR(EINVAL);
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}
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if (codec->codec_id != CODEC_ID_WAVPACK) {
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av_log(s, AV_LOG_ERROR, "unsupported codec\n");
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return AVERROR(EINVAL);
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}
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if (codec->extradata_size > 0) {
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av_log_missing_feature(s, "remuxing from matroska container", 0);
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return AVERROR_PATCHWELCOME;
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}
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wc->off = codec->channels > 2 ? 4 : 0;
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avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate);
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return 0;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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WVMuxContext *wc = s->priv_data;
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AVIOContext *pb = s->pb;
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wc->duration += pkt->duration;
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ffio_wfourcc(pb, "wvpk");
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avio_wl32(pb, pkt->size + 12 + wc->off);
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avio_wl16(pb, 0x410);
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avio_w8(pb, 0);
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avio_w8(pb, 0);
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avio_wl32(pb, -1);
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avio_wl32(pb, pkt->pts);
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avio_write(s->pb, pkt->data, pkt->size);
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avio_flush(s->pb);
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return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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WVMuxContext *wc = s->priv_data;
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AVIOContext *pb = s->pb;
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if (pb->seekable) {
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avio_seek(pb, 12, SEEK_SET);
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avio_wl32(pb, wc->duration);
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avio_flush(pb);
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}
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return 0;
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}
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AVOutputFormat ff_wv_muxer = {
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.name = "wv",
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.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
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.priv_data_size = sizeof(WVMuxContext),
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.extensions = "wv",
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.audio_codec = CODEC_ID_WAVPACK,
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.video_codec = CODEC_ID_NONE,
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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};
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