| /* |
| * 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_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) { |
| 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, |
| }; |