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  1. /*
  2.  * DSD Stream File (DSF) demuxer
  3.  * Copyright (c) 2014 Peter Ross
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25. #include "id3v2.h"
  26.  
  27. typedef struct {
  28.     uint64_t data_end;
  29. } DSFContext;
  30.  
  31. static int dsf_probe(AVProbeData *p)
  32. {
  33.     if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
  34.         return 0;
  35.     return AVPROBE_SCORE_MAX;
  36. }
  37.  
  38. static const uint64_t dsf_channel_layout[] = {
  39.     0,
  40.     AV_CH_LAYOUT_MONO,
  41.     AV_CH_LAYOUT_STEREO,
  42.     AV_CH_LAYOUT_SURROUND,
  43.     AV_CH_LAYOUT_QUAD,
  44.     AV_CH_LAYOUT_4POINT0,
  45.     AV_CH_LAYOUT_5POINT0_BACK,
  46.     AV_CH_LAYOUT_5POINT1_BACK,
  47. };
  48.  
  49. static void read_id3(AVFormatContext *s, uint64_t id3pos)
  50. {
  51.     ID3v2ExtraMeta *id3v2_extra_meta = NULL;
  52.     if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
  53.         return;
  54.  
  55.     ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
  56.     if (id3v2_extra_meta)
  57.         ff_id3v2_parse_apic(s, &id3v2_extra_meta);
  58.     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
  59. }
  60.  
  61. static int dsf_read_header(AVFormatContext *s)
  62. {
  63.     DSFContext *dsf = s->priv_data;
  64.     AVIOContext *pb = s->pb;
  65.     AVStream *st;
  66.     uint64_t id3pos;
  67.     unsigned int channel_type;
  68.  
  69.     avio_skip(pb, 4);
  70.     if (avio_rl64(pb) != 28)
  71.         return AVERROR_INVALIDDATA;
  72.  
  73.     /* create primary stream before any id3 coverart streams */
  74.     st = avformat_new_stream(s, NULL);
  75.     if (!st)
  76.         return AVERROR(ENOMEM);
  77.  
  78.     avio_skip(pb, 8);
  79.     id3pos = avio_rl64(pb);
  80.     if (pb->seekable) {
  81.         read_id3(s, id3pos);
  82.         avio_seek(pb, 28, SEEK_SET);
  83.     }
  84.  
  85.     /* fmt chunk */
  86.  
  87.     if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
  88.         return AVERROR_INVALIDDATA;
  89.  
  90.     if (avio_rl32(pb) != 1) {
  91.         avpriv_request_sample(s, "unknown format version");
  92.         return AVERROR_INVALIDDATA;
  93.     }
  94.  
  95.     if (avio_rl32(pb)) {
  96.         avpriv_request_sample(s, "unknown format id");
  97.         return AVERROR_INVALIDDATA;
  98.     }
  99.  
  100.     channel_type = avio_rl32(pb);
  101.     if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
  102.         st->codec->channel_layout = dsf_channel_layout[channel_type];
  103.     if (!st->codec->channel_layout)
  104.         avpriv_request_sample(s, "channel type %i", channel_type);
  105.  
  106.     st->codec->codec_type   = AVMEDIA_TYPE_AUDIO;
  107.     st->codec->channels     = avio_rl32(pb);
  108.     st->codec->sample_rate  = avio_rl32(pb) / 8;
  109.  
  110.     switch(avio_rl32(pb)) {
  111.     case 1: st->codec->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
  112.     case 8: st->codec->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
  113.     default:
  114.         avpriv_request_sample(s, "unknown most significant bit");
  115.         return AVERROR_INVALIDDATA;
  116.     }
  117.  
  118.     avio_skip(pb, 8);
  119.     st->codec->block_align = avio_rl32(pb);
  120.     if (st->codec->block_align > INT_MAX / st->codec->channels) {
  121.         avpriv_request_sample(s, "block_align overflow");
  122.         return AVERROR_INVALIDDATA;
  123.     }
  124.     st->codec->block_align *= st->codec->channels;
  125.     avio_skip(pb, 4);
  126.  
  127.     /* data chunk */
  128.  
  129.     dsf->data_end = avio_tell(pb);
  130.     if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
  131.         return AVERROR_INVALIDDATA;
  132.     dsf->data_end += avio_rl64(pb);
  133.  
  134.     return 0;
  135. }
  136.  
  137. static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
  138. {
  139.     DSFContext *dsf = s->priv_data;
  140.     AVIOContext *pb = s->pb;
  141.     AVStream *st = s->streams[0];
  142.     int64_t pos = avio_tell(pb);
  143.  
  144.     if (pos >= dsf->data_end)
  145.         return AVERROR_EOF;
  146.  
  147.     pkt->stream_index = 0;
  148.     return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codec->block_align));
  149. }
  150.  
  151. AVInputFormat ff_dsf_demuxer = {
  152.     .name           = "dsf",
  153.     .long_name      = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
  154.     .priv_data_size = sizeof(DSFContext),
  155.     .read_probe     = dsf_probe,
  156.     .read_header    = dsf_read_header,
  157.     .read_packet    = dsf_read_packet,
  158.     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
  159. };
  160.