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 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 
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) {
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",
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
Bytestream IO Context.
Definition: avio.h:68
int size
int size
Definition: avcodec.h:916
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:562
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2141
Format I/O context.
Definition: avformat.h:828
AVStream ** streams
Definition: avformat.h:876
uint8_t * data
Definition: avcodec.h:915
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:218
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
#define AV_CH_LAYOUT_5POINT1
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2736
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2165
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:641
int bit_rate
the average bitrate
Definition: avcodec.h:1404
int void avio_flush(AVIOContext *s)
Definition: aviobuf.c:180
audio channel layout utility functions
const char * name
Definition: avformat.h:376
Stream structure.
Definition: avformat.h:622
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:61
NULL
Definition: eval.c:52
enum AVMediaType codec_type
Definition: avcodec.h:1347
enum AVCodecID codec_id
Definition: avcodec.h:1350
int sample_rate
samples per second
Definition: avcodec.h:2104
AVIOContext * pb
I/O context.
Definition: avformat.h:861
static int daud_write_header(struct AVFormatContext *s)
Definition: daud.c:53
main external API structure.
Definition: avcodec.h:1339
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1365
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:342
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:2105
static int daud_header(AVFormatContext *s)
Definition: daud.c:25
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:455
int stream_index
Definition: avcodec.h:917
This structure stores compressed data.
Definition: avcodec.h:898
static int daud_packet(AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:41