Libav
sndio_enc.c
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1 /*
2  * sndio play and grab interface
3  * Copyright (c) 2010 Jacob Meuser
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 #include "libavformat/avformat.h"
28 
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->filename);
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 
83  .name = "sndio",
84  .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
85  .priv_data_size = sizeof(SndioData),
86  /* XXX: we make the assumption that the soundcard accepts this format */
87  /* XXX: find better solution with "preinit" method, needed also in
88  other formats */
90  .video_codec = AV_CODEC_ID_NONE,
91  .write_header = audio_write_header,
92  .write_packet = audio_write_packet,
93  .write_trailer = audio_write_trailer,
94  .flags = AVFMT_NOFILE,
95 };
int size
int channels
Definition: sndio.h:41
int size
Definition: avcodec.h:1347
Format I/O context.
Definition: avformat.h:940
static int audio_write_trailer(AVFormatContext *s1)
Definition: sndio_enc.c:71
uint8_t
#define av_cold
Definition: attributes.h:66
int sample_rate
Definition: sndio.h:42
#define AV_NE(be, le)
Definition: common.h:46
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1008
uint8_t * data
Definition: avcodec.h:1346
#define AVERROR(e)
Definition: error.h:43
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:148
common internal API header
char filename[1024]
input or output filename
Definition: avformat.h:1016
#define FFMIN(a, b)
Definition: common.h:66
const char * name
Definition: avformat.h:450
int ff_sndio_close(SndioData *s)
Definition: sndio.c:112
Stream structure.
Definition: avformat.h:705
int buffer_size
Definition: sndio.h:39
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
int64_t softpos
Definition: sndio.h:36
struct sio_hdl * hdl
Definition: sndio.h:33
int sample_rate
Audio only.
Definition: avcodec.h:3564
Main libavformat public API header.
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:412
static av_cold int audio_write_header(AVFormatContext *s1)
Definition: sndio_enc.c:31
int len
AVOutputFormat ff_sndio_muxer
Definition: sndio_enc.c:82
void * priv_data
Format private data.
Definition: avformat.h:968
int channels
Audio only.
Definition: avcodec.h:3560
AVCodecParameters * codecpar
Definition: avformat.h:831
static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: sndio_enc.c:46
This structure stores compressed data.
Definition: avcodec.h:1323