FFmpeg
ircamenc.c
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1 /*
2  * IRCAM muxer
3  * Copyright (c) 2012 Paul B Mahol
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/intreadwrite.h"
23 #include "avformat.h"
24 #include "avio_internal.h"
25 #include "internal.h"
26 #include "rawenc.h"
27 #include "ircam.h"
28 
30 {
31  AVCodecParameters *par = s->streams[0]->codecpar;
32  uint32_t tag;
33 
34  if (s->nb_streams != 1) {
35  av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
36  return AVERROR(EINVAL);
37  }
38 
40  if (!tag) {
41  av_log(s, AV_LOG_ERROR, "unsupported codec\n");
42  return AVERROR(EINVAL);
43  }
44 
45  avio_wl32(s->pb, 0x0001A364);
47  avio_wl32(s->pb, par->ch_layout.nb_channels);
48  avio_wl32(s->pb, tag);
49  ffio_fill(s->pb, 0, 1008);
50  return 0;
51 }
52 
54  .name = "ircam",
55  .extensions = "sf,ircam",
56  .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
57  .audio_codec = AV_CODEC_ID_PCM_S16LE,
58  .video_codec = AV_CODEC_ID_NONE,
59  .write_header = ircam_write_header,
60  .write_packet = ff_raw_write_packet,
61  .codec_tag = (const AVCodecTag *const []){ ff_codec_ircam_le_tags, 0 },
62 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:317
ff_ircam_muxer
const AVOutputFormat ff_ircam_muxer
Definition: ircamenc.c:53
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:53
ircam_write_header
static int ircam_write_header(AVFormatContext *s)
Definition: ircamenc.c:29
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
av_q2intfloat
uint32_t av_q2intfloat(AVRational q)
Convert an AVRational to a IEEE 32-bit float expressed in fixed-point format.
Definition: rational.c:152
ircam.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVCodecTag
Definition: internal.h:50
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:31
ff_codec_ircam_le_tags
const AVCodecTag ff_codec_ircam_le_tags[]
Definition: ircam.c:25
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ffio_fill
void ffio_fill(AVIOContext *s, int b, int64_t count)
Definition: aviobuf.c:218
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
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_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:386
rawenc.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:509
avio_internal.h
tag
uint32_t tag
Definition: movenc.c:1631
avformat.h
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:134
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27