FFmpeg
daudenc.c
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1 /*
2  * D-Cinema audio muxer
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 "avformat.h"
23 #include "mux.h"
24 
25 static int daud_init(struct AVFormatContext *s)
26 {
27  AVCodecParameters *par = s->streams[0]->codecpar;
28  int ret;
29 
30  if (par->ch_layout.nb_channels != 6) {
32  "Invalid number of channels %d, must be exactly 6\n",
33  par->ch_layout.nb_channels);
34  return AVERROR(EINVAL);
35  }
36 
37  if (par->sample_rate != 96000) {
39  "Invalid sample rate %d, must be 96000\n",
40  par->sample_rate);
41  return AVERROR(EINVAL);
42  }
43 
44  ret = ff_stream_add_bitstream_filter(s->streams[0], "pcm_rechunk", "n=2000:pad=0");
45  if (ret < 0)
46  return ret;
47 
48  return 0;
49 }
50 
52 {
53  avio_wb16(s->pb, pkt->size);
54  avio_wb16(s->pb, 0x8010); // unknown
55  avio_write(s->pb, pkt->data, pkt->size);
56  return 0;
57 }
58 
60  .p.name = "daud",
61  .p.long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
62  .p.extensions = "302",
63  .p.audio_codec = AV_CODEC_ID_PCM_S24DAUD,
64  .p.video_codec = AV_CODEC_ID_NONE,
65  .p.subtitle_codec = AV_CODEC_ID_NONE,
66  .p.flags = AVFMT_NOTIMESTAMPS,
67  .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
69  .init = daud_init,
70  .write_packet = daud_write_packet,
71 };
AVOutputFormat::name
const char * name
Definition: avformat.h:510
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame 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. Frame references ownership and permissions
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:479
daud_init
static int daud_init(struct AVFormatContext *s)
Definition: daudenc.c:25
AVPacket::data
uint8_t * data
Definition: packet.h:539
FF_OFMT_FLAG_ONLY_DEFAULT_CODECS
#define FF_OFMT_FLAG_ONLY_DEFAULT_CODECS
If this flag is set, then the only permitted audio/video/subtitle codec ids are AVOutputFormat....
Definition: mux.h:59
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:321
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:65
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVFormatContext
Format I/O context.
Definition: avformat.h:1300
daud_write_packet
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daudenc.c:51
FFOutputFormat
Definition: mux.h:61
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
AVPacket::size
int size
Definition: packet.h:540
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:201
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
FF_OFMT_FLAG_MAX_ONE_OF_EACH
#define FF_OFMT_FLAG_MAX_ONE_OF_EACH
If this flag is set, it indicates that for each codec type whose corresponding default codec (i....
Definition: mux.h:50
ret
ret
Definition: filter_design.txt:187
avformat.h
ff_daud_muxer
const FFOutputFormat ff_daud_muxer
Definition: daudenc.c:59
AV_CODEC_ID_PCM_S24DAUD
@ AV_CODEC_ID_PCM_S24DAUD
Definition: codec_id.h:344
AVPacket
This structure stores compressed data.
Definition: packet.h:516
avio_wb16
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:443
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ff_stream_add_bitstream_filter
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
Add a bitstream filter to a stream.
Definition: mux.c:1351
mux.h