daud.c 2.91 KB
Newer Older
1
/*
2
 * D-Cinema audio demuxer
Diego Biurrun's avatar
Diego Biurrun committed
3
 * Copyright (c) 2005 Reimar Döffinger
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav is free software; you can redistribute it and/or
8 9
 * modify it under the terms of the GNU Lesser General Public
 * 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
 * Libav is distributed in the hope that it will be useful,
13 14 15 16 17
 * 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
18
 * License along with Libav; 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 24
#include "avformat.h"

25
static int daud_header(AVFormatContext *s) {
26
    AVStream *st = avformat_new_stream(s, NULL);
27 28
    if (!st)
        return AVERROR(ENOMEM);
29
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
30
    st->codec->codec_id = AV_CODEC_ID_PCM_S24DAUD;
31 32
    st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
    st->codec->channels = 6;
33
    st->codec->channel_layout = AV_CH_LAYOUT_5POINT1;
34 35 36
    st->codec->sample_rate = 96000;
    st->codec->bit_rate = 3 * 6 * 96000 * 8;
    st->codec->block_align = 3 * 6;
37
    st->codec->bits_per_coded_sample = 24;
38 39 40 41
    return 0;
}

static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
42
    AVIOContext *pb = s->pb;
43
    int ret, size;
Anton Khirnov's avatar
Anton Khirnov committed
44
    if (pb->eof_reached)
45
        return AVERROR(EIO);
46 47
    size = avio_rb16(pb);
    avio_rb16(pb); // unknown
48 49 50 51 52
    ret = av_get_packet(pb, pkt, size);
    pkt->stream_index = 0;
    return ret;
}

Peter Ross's avatar
Peter Ross committed
53 54 55 56 57 58 59 60 61 62
static int daud_write_header(struct AVFormatContext *s)
{
    AVCodecContext *codec = s->streams[0]->codec;
    if (codec->channels!=6 || codec->sample_rate!=96000)
        return -1;
    return 0;
}

static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
63 64 65 66 67
    if (pkt->size > 65535) {
        av_log(s, AV_LOG_ERROR,
               "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
        return -1;
    }
68 69 70
    avio_wb16(s->pb, pkt->size);
    avio_wb16(s->pb, 0x8010); // unknown
    avio_write(s->pb, pkt->data, pkt->size);
71
    avio_flush(s->pb);
Peter Ross's avatar
Peter Ross committed
72 73 74 75
    return 0;
}

#if CONFIG_DAUD_DEMUXER
76
AVInputFormat ff_daud_demuxer = {
77
    .name           = "daud",
78
    .long_name      = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
79 80
    .read_header    = daud_header,
    .read_packet    = daud_packet,
81
    .extensions     = "302",
82
};
Peter Ross's avatar
Peter Ross committed
83 84
#endif

85
#if CONFIG_DAUD_MUXER
86 87
AVOutputFormat ff_daud_muxer = {
    .name         = "daud",
88
    .long_name    = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
89
    .extensions   = "302",
90 91
    .audio_codec  = AV_CODEC_ID_PCM_S24DAUD,
    .video_codec  = AV_CODEC_ID_NONE,
92 93 94
    .write_header = daud_write_header,
    .write_packet = daud_write_packet,
    .flags        = AVFMT_NOTIMESTAMPS,
Peter Ross's avatar
Peter Ross committed
95 96
};
#endif