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 "libavformat/avformat.h"
26 
27 #include "sndio_common.h"
28 
30 {
31  SndioData *s = s1->priv_data;
32  AVStream *st;
33  int ret;
34 
35  st = s1->streams[0];
36  s->sample_rate = st->codec->sample_rate;
37  s->channels = st->codec->channels;
38 
39  ret = ff_sndio_open(s1, 1, s1->filename);
40 
41  return ret;
42 }
43 
45 {
46  SndioData *s = s1->priv_data;
47  uint8_t *buf= pkt->data;
48  int size = pkt->size;
49  int len, ret;
50 
51  while (size > 0) {
52  len = FFMIN(s->buffer_size - s->buffer_offset, size);
53  memcpy(s->buffer + s->buffer_offset, buf, len);
54  buf += len;
55  size -= len;
56  s->buffer_offset += len;
57  if (s->buffer_offset >= s->buffer_size) {
58  ret = sio_write(s->hdl, s->buffer, s->buffer_size);
59  if (ret == 0 || sio_eof(s->hdl))
60  return AVERROR(EIO);
61  s->softpos += ret;
62  s->buffer_offset = 0;
63  }
64  }
65 
66  return 0;
67 }
68 
70 {
71  SndioData *s = s1->priv_data;
72 
73  sio_write(s->hdl, s->buffer, s->buffer_offset);
74 
75  ff_sndio_close(s);
76 
77  return 0;
78 }
79 
81  .name = "sndio",
82  .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
83  .priv_data_size = sizeof(SndioData),
84  /* XXX: we make the assumption that the soundcard accepts this format */
85  /* XXX: find better solution with "preinit" method, needed also in
86  other formats */
88  .video_codec = CODEC_ID_NONE,
89  .write_header = audio_write_header,
90  .write_packet = audio_write_packet,
91  .write_trailer = audio_write_trailer,
92  .flags = AVFMT_NOFILE,
93 };