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  1. /*
  2.  * D-Cinema audio demuxer
  3.  * Copyright (c) 2005 Reimar Döffinger
  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/channel_layout.h"
  23. #include "avformat.h"
  24.  
  25. static int daud_header(AVFormatContext *s) {
  26.     AVStream *st = avformat_new_stream(s, NULL);
  27.     if (!st)
  28.         return AVERROR(ENOMEM);
  29.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  30.     st->codec->codec_id = AV_CODEC_ID_PCM_S24DAUD;
  31.     st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
  32.     st->codec->channels = 6;
  33.     st->codec->channel_layout = AV_CH_LAYOUT_5POINT1;
  34.     st->codec->sample_rate = 96000;
  35.     st->codec->bit_rate = 3 * 6 * 96000 * 8;
  36.     st->codec->block_align = 3 * 6;
  37.     st->codec->bits_per_coded_sample = 24;
  38.     return 0;
  39. }
  40.  
  41. static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
  42.     AVIOContext *pb = s->pb;
  43.     int ret, size;
  44.     if (url_feof(pb))
  45.         return AVERROR(EIO);
  46.     size = avio_rb16(pb);
  47.     avio_rb16(pb); // unknown
  48.     ret = av_get_packet(pb, pkt, size);
  49.     pkt->stream_index = 0;
  50.     return ret;
  51. }
  52.  
  53. static int daud_write_header(struct AVFormatContext *s)
  54. {
  55.     AVCodecContext *codec = s->streams[0]->codec;
  56.     if (codec->channels!=6 || codec->sample_rate!=96000)
  57.         return -1;
  58.     return 0;
  59. }
  60.  
  61. static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  62. {
  63.     if (pkt->size > 65535) {
  64.         av_log(s, AV_LOG_ERROR,
  65.                "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
  66.         return -1;
  67.     }
  68.     avio_wb16(s->pb, pkt->size);
  69.     avio_wb16(s->pb, 0x8010); // unknown
  70.     avio_write(s->pb, pkt->data, pkt->size);
  71.     return 0;
  72. }
  73.  
  74. #if CONFIG_DAUD_DEMUXER
  75. AVInputFormat ff_daud_demuxer = {
  76.     .name           = "daud",
  77.     .long_name      = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
  78.     .read_header    = daud_header,
  79.     .read_packet    = daud_packet,
  80.     .extensions     = "302,daud",
  81. };
  82. #endif
  83.  
  84. #if CONFIG_DAUD_MUXER
  85. AVOutputFormat ff_daud_muxer = {
  86.     .name         = "daud",
  87.     .long_name    = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
  88.     .extensions   = "302",
  89.     .audio_codec  = AV_CODEC_ID_PCM_S24DAUD,
  90.     .video_codec  = AV_CODEC_ID_NONE,
  91.     .write_header = daud_write_header,
  92.     .write_packet = daud_write_packet,
  93.     .flags        = AVFMT_NOTIMESTAMPS,
  94. };
  95. #endif
  96.