FFmpeg  2.1.1
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 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 "avdevice.h"
26 #include "sndio_common.h"
27 
29 {
30  SndioData *s = s1->priv_data;
31  AVStream *st;
32  int ret;
33 
34  st = s1->streams[0];
35  s->sample_rate = st->codec->sample_rate;
36  s->channels = st->codec->channels;
37 
38  ret = ff_sndio_open(s1, 1, s1->filename);
39 
40  return ret;
41 }
42 
44 {
45  SndioData *s = s1->priv_data;
46  uint8_t *buf= pkt->data;
47  int size = pkt->size;
48  int len, ret;
49 
50  while (size > 0) {
51  len = FFMIN(s->buffer_size - s->buffer_offset, size);
52  memcpy(s->buffer + s->buffer_offset, buf, len);
53  buf += len;
54  size -= len;
55  s->buffer_offset += len;
56  if (s->buffer_offset >= s->buffer_size) {
57  ret = sio_write(s->hdl, s->buffer, s->buffer_size);
58  if (ret == 0 || sio_eof(s->hdl))
59  return AVERROR(EIO);
60  s->softpos += ret;
61  s->buffer_offset = 0;
62  }
63  }
64 
65  return 0;
66 }
67 
69 {
70  SndioData *s = s1->priv_data;
71 
72  sio_write(s->hdl, s->buffer, s->buffer_offset);
73 
74  ff_sndio_close(s);
75 
76  return 0;
77 }
78 
80  .name = "sndio",
81  .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
82  .priv_data_size = sizeof(SndioData),
83  /* XXX: we make the assumption that the soundcard accepts this format */
84  /* XXX: find better solution with "preinit" method, needed also in
85  other formats */
87  .video_codec = AV_CODEC_ID_NONE,
88  .write_header = audio_write_header,
89  .write_packet = audio_write_packet,
90  .write_trailer = audio_write_trailer,
91  .flags = AVFMT_NOFILE,
92 };
const char * s
Definition: avisynth_c.h:668
int size
int channels
Definition: sndio_common.h:41
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
int size
Definition: avcodec.h:1064
int ff_sndio_close(SndioData *s)
Definition: sndio_common.c:112
#define av_cold
Definition: avcodec.h:653
Format I/O context.
Definition: avformat.h:968
static int audio_write_trailer(AVFormatContext *s1)
Definition: sndio_enc.c:68
uint8_t
int sample_rate
Definition: sndio_common.h:42
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:347
void * priv_data
Format private data.
Definition: avformat.h:988
char filename[1024]
input or output filename
Definition: avformat.h:1018
uint8_t * buffer
Definition: sndio_common.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
ret
Definition: avfilter.c:961
AVStream ** streams
Definition: avformat.h:1016
#define FFMIN(a, b)
Definition: avcodec.h:925
const char * name
Definition: avformat.h:395
Stream structure.
Definition: avformat.h:667
int sample_rate
samples per second
Definition: avcodec.h:1873
Main libavdevice API header.
int buffer_size
Definition: sndio_common.h:39
void * buf
Definition: avisynth_c.h:594
uint8_t * data
Definition: avcodec.h:1063
int buffer_offset
Definition: sndio_common.h:40
#define AV_NE(be, le)
Definition: avcodec.h:908
#define s1
Definition: regdef.h:38
int64_t softpos
Definition: sndio_common.h:36
struct sio_hdl * hdl
Definition: sndio_common.h:33
av_cold int ff_sndio_open(AVFormatContext *s1, int is_output, const char *audio_device)
Definition: sndio_common.c:36
static av_cold int audio_write_header(AVFormatContext *s1)
Definition: sndio_enc.c:28
int len
int channels
number of audio channels
Definition: avcodec.h:1874
AVOutputFormat ff_sndio_muxer
Definition: sndio_enc.c:79
#define AVERROR(e)
static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: sndio_enc.c:43
static AVPacket pkt
Definition: demuxing.c:52
This structure stores compressed data.
Definition: avcodec.h:1040