FFmpeg
sndio_enc.c
Go to the documentation of this file.
1 /*
2  * sndio play and grab interface
3  * Copyright (c) 2010 Jacob Meuser
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 <stdint.h>
23 #include <sndio.h>
24 
25 #include "libavutil/internal.h"
26 
27 
28 #include "libavdevice/avdevice.h"
29 #include "libavdevice/sndio.h"
30 
32 {
33  SndioData *s = s1->priv_data;
34  AVStream *st;
35  int ret;
36 
37  st = s1->streams[0];
39  s->channels = st->codecpar->channels;
40 
41  ret = ff_sndio_open(s1, 1, s1->url);
42 
43  return ret;
44 }
45 
47 {
48  SndioData *s = s1->priv_data;
49  uint8_t *buf= pkt->data;
50  int size = pkt->size;
51  int len, ret;
52 
53  while (size > 0) {
54  len = FFMIN(s->buffer_size - s->buffer_offset, size);
55  memcpy(s->buffer + s->buffer_offset, buf, len);
56  buf += len;
57  size -= len;
58  s->buffer_offset += len;
59  if (s->buffer_offset >= s->buffer_size) {
60  ret = sio_write(s->hdl, s->buffer, s->buffer_size);
61  if (ret == 0 || sio_eof(s->hdl))
62  return AVERROR(EIO);
63  s->softpos += ret;
64  s->buffer_offset = 0;
65  }
66  }
67 
68  return 0;
69 }
70 
72 {
73  SndioData *s = s1->priv_data;
74 
75  sio_write(s->hdl, s->buffer, s->buffer_offset);
76 
77  ff_sndio_close(s);
78 
79  return 0;
80 }
81 
82 static const AVClass sndio_muxer_class = {
83  .class_name = "sndio outdev",
84  .item_name = av_default_item_name,
85  .version = LIBAVUTIL_VERSION_INT,
87 };
88 
90  .name = "sndio",
91  .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
92  .priv_data_size = sizeof(SndioData),
93  /* XXX: we make the assumption that the soundcard accepts this format */
94  /* XXX: find better solution with "preinit" method, needed also in
95  other formats */
97  .video_codec = AV_CODEC_ID_NONE,
98  .write_header = audio_write_header,
99  .write_packet = audio_write_packet,
100  .write_trailer = audio_write_trailer,
101  .flags = AVFMT_NOFILE,
102  .priv_class = &sndio_muxer_class,
103 };
int channels
Definition: sndio.h:41
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int size
Definition: packet.h:356
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1351
static int audio_write_trailer(AVFormatContext *s1)
Definition: sndio_enc.c:71
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
uint8_t
#define av_cold
Definition: attributes.h:88
int sample_rate
Definition: sndio.h:42
#define AV_NE(be, le)
Definition: common.h:50
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
uint8_t * data
Definition: packet.h:355
ptrdiff_t size
Definition: opengl_enc.c:100
Main libavdevice API header.
uint8_t * buffer
Definition: sndio.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
char * url
input or output URL.
Definition: avformat.h:1447
common internal API header
#define FFMIN(a, b)
Definition: common.h:96
const char * name
Definition: avformat.h:500
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_sndio_close(SndioData *s)
Definition: sndio.c:112
Stream structure.
Definition: avformat.h:876
int buffer_size
Definition: sndio.h:39
Describe the class of an AVClass context structure.
Definition: log.h:67
int buffer_offset
Definition: sndio.h:40
av_cold int ff_sndio_open(AVFormatContext *s1, int is_output, const char *audio_device)
Definition: sndio.c:36
#define s1
Definition: regdef.h:38
int64_t softpos
Definition: sndio.h:36
struct sio_hdl * hdl
Definition: sndio.h:33
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
static av_cold int audio_write_header(AVFormatContext *s1)
Definition: sndio_enc.c:31
int len
AVOutputFormat ff_sndio_muxer
Definition: sndio_enc.c:89
void * priv_data
Format private data.
Definition: avformat.h:1379
int channels
Audio only.
Definition: codec_par.h:166
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: sndio_enc.c:46
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
static const AVClass sndio_muxer_class
Definition: sndio_enc.c:82
This structure stores compressed data.
Definition: packet.h:332