daud.c
Go to the documentation of this file.
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 
23 #include "avformat.h"
24 
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
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:595
static AVPacket pkt
Definition: demuxing.c:56
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
AVStream ** streams
Definition: avformat.h:992
uint8_t * data
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:173
#define AV_CH_LAYOUT_5POINT1
#define NULL_IF_CONFIG_SMALL(x)
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:246
int size
AVCodecContext * codec
Definition: avformat.h:662
ret
Definition: avfilter.c:821
const char * name
Definition: avformat.h:378
int url_feof(AVIOContext *s)
Definition: aviobuf.c:280
#define AVFMT_NOTIMESTAMPS
Definition: avformat.h:352
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:61
NULL
Definition: eval.c:55
enum AVMediaType codec_type
enum AVCodecID codec_id
int sample_rate
samples per second
AVIOContext * pb
Definition: avformat.h:977
static int daud_write_header(struct AVFormatContext *s)
Definition: daud.c:53
#define AV_LOG_ERROR
Definition: log.h:148
unsigned int codec_tag
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Buffer references ownership and permissions
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:373
int channels
number of audio channels
static int daud_header(AVFormatContext *s)
Definition: daud.c:25
const char * name
Definition: avformat.h:461
#define MKTAG(a, b, c, d)
Definition: common.h:282
static int daud_packet(AVFormatContext *s, AVPacket *pkt)
Definition: daud.c:41