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
29static inline void movecb(void *addr, int delta)
30{
31    SndioData *s = addr;
32
33    s->hwpos += delta * s->channels * s->bps;
34}
35
36av_cold int ff_sndio_open(AVFormatContext *s1, int is_output,
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
87    s->codec_id    = par.le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
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
103fail:
104    av_freep(&s->buffer);
105
106    if (hdl)
107        sio_close(hdl);
108
109    return AVERROR(EIO);
110}
111
112int ff_sndio_close(SndioData *s)
113{
114    av_freep(&s->buffer);
115
116    if (s->hdl)
117        sio_close(s->hdl);
118
119    return 0;
120}
121