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/*
* DSD Stream File (DSF) demuxer
* Copyright (c) 2014 Peter Ross
*
* 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 "id3v2.h"
typedef struct {
uint64_t data_end;
} DSFContext;
static int dsf_probe(AVProbeData *p)
{
if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
return 0;
return AVPROBE_SCORE_MAX;
}
static const uint64_t dsf_channel_layout[] = {
0,
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
AV_CH_LAYOUT_SURROUND,
AV_CH_LAYOUT_QUAD,
AV_CH_LAYOUT_4POINT0,
AV_CH_LAYOUT_5POINT0_BACK,
AV_CH_LAYOUT_5POINT1_BACK,
};
static void read_id3(AVFormatContext *s, uint64_t id3pos)
{
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
return;
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if (id3v2_extra_meta)
ff_id3v2_parse_apic(s, &id3v2_extra_meta);
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
}
static int dsf_read_header(AVFormatContext *s)
{
DSFContext *dsf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
uint64_t id3pos;
unsigned int channel_type;
avio_skip(pb, 4);
if (avio_rl64(pb) != 28)
return AVERROR_INVALIDDATA;
avio_skip(pb, 8);
id3pos = avio_rl64(pb);
if (pb->seekable) {
read_id3(s, id3pos);
avio_seek(pb, 28, SEEK_SET);
}
/* fmt chunk */
if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
return AVERROR_INVALIDDATA;
if (avio_rl32(pb) != 1) {
avpriv_request_sample(s, "unknown format version");
return AVERROR_INVALIDDATA;
}
if (avio_rl32(pb)) {
avpriv_request_sample(s, "unknown format id");
return AVERROR_INVALIDDATA;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
channel_type = avio_rl32(pb);
if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
st->codec->channel_layout = dsf_channel_layout[channel_type];
if (!st->codec->channel_layout)
avpriv_request_sample(s, "channel type %i", channel_type);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->channels = avio_rl32(pb);
st->codec->sample_rate = avio_rl32(pb) / 8;
switch(avio_rl32(pb)) {
case 1: st->codec->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
case 8: st->codec->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
default:
avpriv_request_sample(s, "unknown most significant bit");
return AVERROR_INVALIDDATA;
}
avio_skip(pb, 8);
st->codec->block_align = avio_rl32(pb);
if (st->codec->block_align > INT_MAX / st->codec->channels) {
avpriv_request_sample(s, "block_align overflow");
return AVERROR_INVALIDDATA;
}
st->codec->block_align *= st->codec->channels;
avio_skip(pb, 4);
/* data chunk */
dsf->data_end = avio_tell(pb);
if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
return AVERROR_INVALIDDATA;
dsf->data_end += avio_rl64(pb);
return 0;
}
static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DSFContext *dsf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = s->streams[0];
int64_t pos = avio_tell(pb);
if (pos >= dsf->data_end)
return AVERROR_EOF;
pkt->stream_index = 0;
return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codec->block_align));
}
AVInputFormat ff_dsf_demuxer = {
.name = "dsf",
.long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
.priv_data_size = sizeof(DSFContext),
.read_probe = dsf_probe,
.read_header = dsf_read_header,
.read_packet = dsf_read_packet,
.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
};
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