FFmpeg
daudenc.c
Go to the documentation of this file.
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 
24 static int daud_init(struct AVFormatContext *s)
25 {
26  AVCodecParameters *par = s->streams[0]->codecpar;
27  if (par->channels!=6 || par->sample_rate!=96000)
28  return AVERROR(EINVAL);
29  return 0;
30 }
31 
33 {
34  if (pkt->size > 65535) {
36  "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
37  return AVERROR_INVALIDDATA;
38  }
39  avio_wb16(s->pb, pkt->size);
40  avio_wb16(s->pb, 0x8010); // unknown
41  avio_write(s->pb, pkt->data, pkt->size);
42  return 0;
43 }
44 
46  .name = "daud",
47  .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
48  .extensions = "302",
49  .audio_codec = AV_CODEC_ID_PCM_S24DAUD,
50  .video_codec = AV_CODEC_ID_NONE,
51  .init = daud_init,
52  .write_packet = daud_write_packet,
53  .flags = AVFMT_NOTIMESTAMPS,
54 };
AVOutputFormat::name
const char * name
Definition: avformat.h:497
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:52
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:468
daud_init
static int daud_init(struct AVFormatContext *s)
Definition: daudenc.c:24
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_daud_muxer
const AVOutputFormat ff_daud_muxer
Definition: daudenc.c:45
AVFormatContext
Format I/O context.
Definition: avformat.h:1193
daud_write_packet
static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: daudenc.c:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVPacket::size
int size
Definition: packet.h:374
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:117
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:232
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:496
avformat.h
AV_CODEC_ID_PCM_S24DAUD
@ AV_CODEC_ID_PCM_S24DAUD
Definition: codec_id.h:330
AVPacket
This structure stores compressed data.
Definition: packet.h:350
avio_wb16
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:472
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61