Libav
dauddec.c
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1 /*
2  * D-Cinema audio demuxer
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  * 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  * Libav 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 Libav; 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 
41 static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
42  AVIOContext *pb = s->pb;
43  int ret, size;
44  if (pb->eof_reached)
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 
54  .name = "daud",
55  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
56  .read_header = daud_header,
57  .read_packet = daud_packet,
58  .extensions = "302",
59 };
Bytestream IO Context.
Definition: avio.h:68
int size
static int daud_header(AVFormatContext *s)
Definition: dauddec.c:25
AVInputFormat ff_daud_demuxer
Definition: dauddec.c:53
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:580
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1828
Format I/O context.
Definition: avformat.h:922
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2518
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:117
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2507
static int daud_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dauddec.c:41
#define AV_CH_LAYOUT_5POINT1
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1852
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int bit_rate
the average bitrate
Definition: avcodec.h:1114
audio channel layout utility functions
Stream structure.
Definition: avformat.h:699
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1791
AVIOContext * pb
I/O context.
Definition: avformat.h:964
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
Main libavformat public API header.
int eof_reached
true if eof reached
Definition: avio.h:96
int channels
number of audio channels
Definition: avcodec.h:1792
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
int stream_index
Definition: avcodec.h:975
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:950