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sndio_common.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 
27 #include "sndio_common.h"
28 
29 static inline void movecb(void *addr, int delta)
30 {
31  SndioData *s = addr;
32 
33  s->hwpos += delta * s->channels * s->bps;
34 }
35 
37  const char *audio_device)
38 {
39  SndioData *s = s1->priv_data;
40  struct sio_hdl *hdl;
41  struct sio_par par;
42 
43  hdl = sio_open(audio_device, is_output ? SIO_PLAY : SIO_REC, 0);
44  if (!hdl) {
45  av_log(s1, AV_LOG_ERROR, "Could not open sndio device\n");
46  return AVERROR(EIO);
47  }
48 
49  sio_initpar(&par);
50 
51  par.bits = 16;
52  par.sig = 1;
53  par.le = SIO_LE_NATIVE;
54 
55  if (is_output)
56  par.pchan = s->channels;
57  else
58  par.rchan = s->channels;
59  par.rate = s->sample_rate;
60 
61  if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
62  av_log(s1, AV_LOG_ERROR, "Impossible to set sndio parameters, "
63  "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
64  goto fail;
65  }
66 
67  if (par.bits != 16 || par.sig != 1 ||
68  (is_output && (par.pchan != s->channels)) ||
69  (!is_output && (par.rchan != s->channels)) ||
70  (par.rate != s->sample_rate)) {
71  av_log(s1, AV_LOG_ERROR, "Could not set appropriate sndio parameters, "
72  "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
73  goto fail;
74  }
75 
76  s->buffer_size = par.round * par.bps *
77  (is_output ? par.pchan : par.rchan);
78 
79  if (is_output) {
80  s->buffer = av_malloc(s->buffer_size);
81  if (!s->buffer) {
82  av_log(s1, AV_LOG_ERROR, "Could not allocate buffer\n");
83  goto fail;
84  }
85  }
86 
88  s->channels = is_output ? par.pchan : par.rchan;
89  s->sample_rate = par.rate;
90  s->bps = par.bps;
91 
92  sio_onmove(hdl, movecb, s);
93 
94  if (!sio_start(hdl)) {
95  av_log(s1, AV_LOG_ERROR, "Could not start sndio\n");
96  goto fail;
97  }
98 
99  s->hdl = hdl;
100 
101  return 0;
102 
103 fail:
104  av_freep(&s->buffer);
105 
106  if (hdl)
107  sio_close(hdl);
108 
109  return AVERROR(EIO);
110 }
111 
113 {
114  av_freep(&s->buffer);
115 
116  if (s->hdl)
117  sio_close(s->hdl);
118 
119  return 0;
120 }