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daud.c
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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 
23 #include "avformat.h"
24 
25 static int daud_header(AVFormatContext *s) {
27  if (!st)
28  return AVERROR(ENOMEM);
31  st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
32  st->codec->channels = 6;
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 
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 
62 {
63  if (pkt->size > 65535) {
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  avio_flush(s->pb);
72  return 0;
73 }
74 
75 #if CONFIG_DAUD_DEMUXER
76 AVInputFormat ff_daud_demuxer = {
77  .name = "daud",
78  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
79  .read_header = daud_header,
80  .read_packet = daud_packet,
81  .extensions = "302,daud",
82 };
83 #endif
84 
85 #if CONFIG_DAUD_MUXER
86 AVOutputFormat ff_daud_muxer = {
87  .name = "daud",
88  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
89  .extensions = "302",
90  .audio_codec = AV_CODEC_ID_PCM_S24DAUD,
91  .video_codec = AV_CODEC_ID_NONE,
92  .write_header = daud_write_header,
93  .write_packet = daud_write_packet,
94  .flags = AVFMT_NOTIMESTAMPS,
95 };
96 #endif