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 #include "avformat.h"
22 
25  if (!st)
26  return AVERROR(ENOMEM);
29  st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
30  st->codec->channels = 6;
31  st->codec->sample_rate = 96000;
32  st->codec->bit_rate = 3 * 6 * 96000 * 8;
33  st->codec->block_align = 3 * 6;
34  st->codec->bits_per_coded_sample = 24;
35  return 0;
36 }
37 
38 static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
39  AVIOContext *pb = s->pb;
40  int ret, size;
41  if (pb->eof_reached)
42  return AVERROR(EIO);
43  size = avio_rb16(pb);
44  avio_rb16(pb); // unknown
45  ret = av_get_packet(pb, pkt, size);
46  pkt->stream_index = 0;
47  return ret;
48 }
49 
50 static int daud_write_header(struct AVFormatContext *s)
51 {
52  AVCodecContext *codec = s->streams[0]->codec;
53  if (codec->channels!=6 || codec->sample_rate!=96000)
54  return -1;
55  return 0;
56 }
57 
58 static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
59 {
60  if (pkt->size > 65535) {
62  "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
63  return -1;
64  }
65  avio_wb16(s->pb, pkt->size);
66  avio_wb16(s->pb, 0x8010); // unknown
67  avio_write(s->pb, pkt->data, pkt->size);
68  avio_flush(s->pb);
69  return 0;
70 }
71 
72 #if CONFIG_DAUD_DEMUXER
73 AVInputFormat ff_daud_demuxer = {
74  .name = "daud",
75  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
76  .read_header = daud_header,
77  .read_packet = daud_packet,
78  .extensions = "302",
79 };
80 #endif
81 
82 #if CONFIG_DAUD_MUXER
83 AVOutputFormat ff_daud_muxer = {
84  .name = "daud",
85  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
86  .extensions = "302",
87  .audio_codec = CODEC_ID_PCM_S24DAUD,
88  .video_codec = CODEC_ID_NONE,
89  .write_header = daud_write_header,
90  .write_packet = daud_write_packet,
91  .flags = AVFMT_NOTIMESTAMPS,
92 };
93 #endif
Bytestream IO Context.
Definition: avio.h:68
int size
int size
Definition: avcodec.h:909
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:754
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1751
Format I/O context.
Definition: avformat.h:863
AVStream ** streams
Definition: avformat.h:908
uint8_t * data
Definition: avcodec.h:908
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:269
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1974
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:190
static int daud_header(AVFormatContext *s, AVFormatParameters *ap)
Definition: daud.c:23
#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:191
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2776
AVCodecContext * codec
codec context
Definition: avformat.h:623
int bit_rate
the average bitrate
Definition: avcodec.h:1340
int void avio_flush(AVIOContext *s)
Definition: aviobuf.c:205
const char * name
Definition: avformat.h:390
Stream structure.
Definition: avformat.h:620
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:375
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:58
NULL
Definition: eval.c:50
enum AVMediaType codec_type
Definition: avcodec.h:1574
int sample_rate
samples per second
Definition: avcodec.h:1456
AVIOContext * pb
Definition: avformat.h:896
static int daud_write_header(struct AVFormatContext *s)
Definition: daud.c:50
main external API structure.
Definition: avcodec.h:1329
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1590
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:533
Main libavformat public API header.
int eof_reached
true if eof reached
Definition: avio.h:98
int channels
number of audio channels
Definition: avcodec.h:1457
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:460
int stream_index
Definition: avcodec.h:910
#define MKTAG(a, b, c, d)
Definition: common.h:231
static int daud_packet(AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:38
enum CodecID codec_id
Definition: avcodec.h:1575