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![Lukas Stabe](/assets/img/avatar_default.png)
These changes store id3 chapter data in ID3v2ExtraMeta and introduce ff_id3v2_parse_chapters to parse them into the format context if needed. Encoders using ff_id3v2_read, which previously parsed chapters into the format context automatically, were adjusted to call ff_id3v2_parse_chapters. Signed-off-by: wm4 <nfxjfg@googlemail.com>
166 lines
4.8 KiB
C
166 lines
4.8 KiB
C
/*
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* DSD Stream File (DSF) demuxer
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* Copyright (c) 2014 Peter Ross
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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 "id3v2.h"
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typedef struct {
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uint64_t data_end;
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} DSFContext;
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static int dsf_probe(AVProbeData *p)
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{
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if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static const uint64_t dsf_channel_layout[] = {
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0,
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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AV_CH_LAYOUT_SURROUND,
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AV_CH_LAYOUT_QUAD,
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AV_CH_LAYOUT_4POINT0,
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AV_CH_LAYOUT_5POINT0_BACK,
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AV_CH_LAYOUT_5POINT1_BACK,
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};
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static void read_id3(AVFormatContext *s, uint64_t id3pos)
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{
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ID3v2ExtraMeta *id3v2_extra_meta = NULL;
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if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
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return;
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ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
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if (id3v2_extra_meta) {
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ff_id3v2_parse_apic(s, &id3v2_extra_meta);
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ff_id3v2_parse_chapters(s, &id3v2_extra_meta);
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}
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ff_id3v2_free_extra_meta(&id3v2_extra_meta);
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}
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static int dsf_read_header(AVFormatContext *s)
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{
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DSFContext *dsf = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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uint64_t id3pos;
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unsigned int channel_type;
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avio_skip(pb, 4);
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if (avio_rl64(pb) != 28)
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return AVERROR_INVALIDDATA;
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/* create primary stream before any id3 coverart streams */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(pb, 8);
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id3pos = avio_rl64(pb);
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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read_id3(s, id3pos);
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avio_seek(pb, 28, SEEK_SET);
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}
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/* fmt chunk */
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if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
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return AVERROR_INVALIDDATA;
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if (avio_rl32(pb) != 1) {
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avpriv_request_sample(s, "unknown format version");
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return AVERROR_INVALIDDATA;
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}
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if (avio_rl32(pb)) {
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avpriv_request_sample(s, "unknown format id");
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return AVERROR_INVALIDDATA;
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}
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channel_type = avio_rl32(pb);
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if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
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st->codecpar->channel_layout = dsf_channel_layout[channel_type];
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if (!st->codecpar->channel_layout)
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avpriv_request_sample(s, "channel type %i", channel_type);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->channels = avio_rl32(pb);
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st->codecpar->sample_rate = avio_rl32(pb) / 8;
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if (st->codecpar->channels <= 0)
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return AVERROR_INVALIDDATA;
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switch(avio_rl32(pb)) {
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case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
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case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
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default:
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avpriv_request_sample(s, "unknown most significant bit");
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return AVERROR_INVALIDDATA;
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}
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avio_skip(pb, 8);
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st->codecpar->block_align = avio_rl32(pb);
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if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {
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avpriv_request_sample(s, "block_align overflow");
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->block_align *= st->codecpar->channels;
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st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * 8LL;
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avio_skip(pb, 4);
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/* data chunk */
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dsf->data_end = avio_tell(pb);
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if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
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return AVERROR_INVALIDDATA;
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dsf->data_end += avio_rl64(pb);
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return 0;
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}
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static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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DSFContext *dsf = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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int64_t pos = avio_tell(pb);
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if (pos >= dsf->data_end)
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return AVERROR_EOF;
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pkt->stream_index = 0;
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return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
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}
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AVInputFormat ff_dsf_demuxer = {
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.name = "dsf",
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.long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
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.priv_data_size = sizeof(DSFContext),
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.read_probe = dsf_probe,
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.read_header = dsf_read_header,
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.read_packet = dsf_read_packet,
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
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};
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