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/*
* WavPack muxer
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"
typedef struct WVMuxContext {
int64_t samples;
} WVMuxContext;
static int write_header(AVFormatContext *s)
{
AVCodecContext *codec = s->streams[0]->codec;
if (s->nb_streams > 1) {
av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
return AVERROR(EINVAL);
}
if (codec->codec_id != AV_CODEC_ID_WAVPACK) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR(EINVAL);
}
return 0;
}
static int write_packet(AVFormatContext *ctx, AVPacket *pkt)
{
WVMuxContext *s = ctx->priv_data;
if (pkt->size >= 24)
s->samples += AV_RL32(pkt->data + 20);
avio_write(ctx->pb, pkt->data, pkt->size);
return 0;
}
static int write_trailer(AVFormatContext *ctx)
{
WVMuxContext *s = ctx->priv_data;
ff_ape_write(ctx);
if (ctx->pb->seekable && s->samples) {
avio_seek(ctx->pb, 12, SEEK_SET);
if (s->samples < 0xFFFFFFFFu)
avio_wl32(ctx->pb, s->samples);
else
avio_wl32(ctx->pb, 0xFFFFFFFFu);
avio_flush(ctx->pb);
}
return 0;
}
AVOutputFormat ff_wv_muxer = {
.name = "wv",
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
.priv_data_size = sizeof(WVMuxContext),
.extensions = "wv",
.audio_codec = AV_CODEC_ID_WAVPACK,
.video_codec = AV_CODEC_ID_NONE,
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
.flags = AVFMT_NOTIMESTAMPS,
};
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