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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 "avio_internal.h"
#include "apetag.h"
#define WV_EXTRA_SIZE 12
#define WV_END_BLOCK 0x1000
typedef struct{
uint32_t duration;
} 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);
}
if (codec->extradata_size > 0) {
av_log_missing_feature(s, "remuxing from matroska container", 0);
return AVERROR_PATCHWELCOME;
}
avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate);
return 0;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
WVMuxContext *wc = s->priv_data;
AVCodecContext *codec = s->streams[0]->codec;
AVIOContext *pb = s->pb;
uint64_t size;
uint32_t flags;
uint32_t left = pkt->size;
uint8_t *ptr = pkt->data;
int off = codec->channels > 2 ? 4 : 0;
/* FIXME: Simplify decoder/demuxer so bellow code can support midstream
* change of stream parameters */
wc->duration += pkt->duration;
ffio_wfourcc(pb, "wvpk");
if (off) {
size = AV_RL32(pkt->data);
if (size <= 12)
return AVERROR_INVALIDDATA;
size -= 12;
} else {
size = pkt->size;
}
if (size + off > left)
return AVERROR_INVALIDDATA;
avio_wl32(pb, size + 12);
avio_wl16(pb, 0x410);
avio_w8(pb, 0);
avio_w8(pb, 0);
avio_wl32(pb, -1);
avio_wl32(pb, pkt->pts);
ptr += off; left -= off;
flags = AV_RL32(ptr + 4);
avio_write(pb, ptr, size);
ptr += size; left -= size;
while (!(flags & WV_END_BLOCK) &&
(left >= 4 + WV_EXTRA_SIZE)) {
ffio_wfourcc(pb, "wvpk");
size = AV_RL32(ptr);
ptr += 4; left -= 4;
if (size < 24 || size - 24 > left)
return AVERROR_INVALIDDATA;
avio_wl32(pb, size);
avio_wl16(pb, 0x410);
avio_w8(pb, 0);
avio_w8(pb, 0);
avio_wl32(pb, -1);
avio_wl32(pb, pkt->pts);
flags = AV_RL32(ptr + 4);
avio_write(pb, ptr, WV_EXTRA_SIZE);
ptr += WV_EXTRA_SIZE; left -= WV_EXTRA_SIZE;
avio_write(pb, ptr, size - 24);
ptr += size - 24; left -= size - 24;
}
avio_flush(pb);
return 0;
}
static int write_trailer(AVFormatContext *s)
{
WVMuxContext *wc = s->priv_data;
AVIOContext *pb = s->pb;
ff_ape_write(s);
if (pb->seekable) {
avio_seek(pb, 12, SEEK_SET);
avio_wl32(pb, wc->duration);
avio_flush(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,
};
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