mirror of https://git.ffmpeg.org/ffmpeg.git
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/*
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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 "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "apetag.h"
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typedef struct WVMuxContext {
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int64_t samples;
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} WVMuxContext;
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static int write_header(AVFormatContext *s)
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{
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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 != AV_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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return 0;
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}
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static int write_packet(AVFormatContext *ctx, AVPacket *pkt)
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{
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WVMuxContext *s = ctx->priv_data;
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if (pkt->size >= 24)
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s->samples += AV_RL32(pkt->data + 20);
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avio_write(ctx->pb, pkt->data, pkt->size);
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return 0;
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}
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static int write_trailer(AVFormatContext *ctx)
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{
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WVMuxContext *s = ctx->priv_data;
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ff_ape_write(ctx);
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if (ctx->pb->seekable && s->samples) {
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avio_seek(ctx->pb, 12, SEEK_SET);
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if (s->samples < 0xFFFFFFFFu)
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avio_wl32(ctx->pb, s->samples);
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else
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avio_wl32(ctx->pb, 0xFFFFFFFFu);
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avio_flush(ctx->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 = AV_CODEC_ID_WAVPACK,
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.video_codec = AV_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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.flags = AVFMT_NOTIMESTAMPS,
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};
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