FFmpeg  2.1.1
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 
22 #include "libavutil/channel_layout.h"
23 #include "avformat.h"
24 
26  AVStream *st = avformat_new_stream(s, NULL);
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  return 0;
72 }
73 
74 #if CONFIG_DAUD_DEMUXER
75 AVInputFormat ff_daud_demuxer = {
76  .name = "daud",
77  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
78  .read_header = daud_header,
79  .read_packet = daud_packet,
80  .extensions = "302,daud",
81 };
82 #endif
83 
84 #if CONFIG_DAUD_MUXER
85 AVOutputFormat ff_daud_muxer = {
86  .name = "daud",
87  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
88  .extensions = "302",
89  .audio_codec = AV_CODEC_ID_PCM_S24DAUD,
90  .video_codec = AV_CODEC_ID_NONE,
91  .write_header = daud_write_header,
92  .write_packet = daud_write_packet,
93  .flags = AVFMT_NOTIMESTAMPS,
94 };
95 #endif
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
int size
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
int size
Definition: avcodec.h:1064
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:173
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1910
Format I/O context.
Definition: avformat.h:968
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:354
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2563
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
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:200
#define AV_CH_LAYOUT_5POINT1
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1934
int bit_rate
the average bitrate
Definition: avcodec.h:1204
ret
Definition: avfilter.c:961
AVStream ** streams
Definition: avformat.h:1016
const char * name
Definition: avformat.h:395
Stream structure.
Definition: avformat.h:667
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:61
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
static int daud_write_header(struct AVFormatContext *s)
Definition: daud.c:53
main external API structure.
Definition: avcodec.h:1146
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1172
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
#define MKTAG(a, b, c, d)
uint8_t * data
Definition: avcodec.h:1063
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:373
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
Main libavformat public API header.
int channels
number of audio channels
Definition: avcodec.h:1874
#define AVERROR(e)
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:609
static int daud_header(AVFormatContext *s)
Definition: daud.c:25
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
This structure stores compressed data.
Definition: avcodec.h:1040
static int daud_packet(AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:41