mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
165 lines
4.8 KiB
165 lines
4.8 KiB
/* |
|
* 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, 0); |
|
if (id3v2_extra_meta) { |
|
ff_id3v2_parse_apic(s, &id3v2_extra_meta); |
|
ff_id3v2_parse_chapters(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; |
|
|
|
/* create primary stream before any id3 coverart streams */ |
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
avio_skip(pb, 8); |
|
id3pos = avio_rl64(pb); |
|
if (pb->seekable & AVIO_SEEKABLE_NORMAL) { |
|
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; |
|
} |
|
|
|
channel_type = avio_rl32(pb); |
|
if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout)) |
|
st->codecpar->channel_layout = dsf_channel_layout[channel_type]; |
|
if (!st->codecpar->channel_layout) |
|
avpriv_request_sample(s, "channel type %i", channel_type); |
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codecpar->channels = avio_rl32(pb); |
|
st->codecpar->sample_rate = avio_rl32(pb) / 8; |
|
|
|
if (st->codecpar->channels <= 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
switch(avio_rl32(pb)) { |
|
case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break; |
|
case 8: st->codecpar->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->codecpar->block_align = avio_rl32(pb); |
|
if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) { |
|
avpriv_request_sample(s, "block_align overflow"); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
st->codecpar->block_align *= st->codecpar->channels; |
|
st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * 8LL; |
|
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->codecpar->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, |
|
};
|
|
|