Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavdevice / oss_audio.c
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1/*
2 * Linux audio play and grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
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 "config.h"
23
24#include <string.h>
25
26#if HAVE_SOUNDCARD_H
27#include <soundcard.h>
28#else
29#include <sys/soundcard.h>
30#endif
31
32#if HAVE_UNISTD_H
33#include <unistd.h>
34#endif
35#include <fcntl.h>
36#include <sys/ioctl.h>
37
38#include "libavutil/log.h"
39
40#include "libavcodec/avcodec.h"
41#include "avdevice.h"
42
43#include "oss_audio.h"
44
45int ff_oss_audio_open(AVFormatContext *s1, int is_output,
46 const char *audio_device)
47{
48 OSSAudioData *s = s1->priv_data;
49 int audio_fd;
50 int tmp, err;
51 char *flip = getenv("AUDIO_FLIP_LEFT");
52
53 if (is_output)
54 audio_fd = avpriv_open(audio_device, O_WRONLY);
55 else
56 audio_fd = avpriv_open(audio_device, O_RDONLY);
57 if (audio_fd < 0) {
f6fa7814 58 av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(errno)));
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59 return AVERROR(EIO);
60 }
61
62 if (flip && *flip == '1') {
63 s->flip_left = 1;
64 }
65
66 /* non blocking mode */
67 if (!is_output) {
68 if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) {
f6fa7814 69 av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno)));
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70 }
71 }
72
73 s->frame_size = OSS_AUDIO_BLOCK_SIZE;
74
75#define CHECK_IOCTL_ERROR(event) \
76 if (err < 0) { \
f6fa7814 77 av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\
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78 goto fail; \
79 }
80
81 /* select format : favour native format
82 * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be
83 * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to
f6fa7814 84 * fail anyway. */
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85 err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
86 if (err < 0) {
f6fa7814 87 av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno)));
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88 }
89
90#if HAVE_BIGENDIAN
91 if (tmp & AFMT_S16_BE) {
92 tmp = AFMT_S16_BE;
93 } else if (tmp & AFMT_S16_LE) {
94 tmp = AFMT_S16_LE;
95 } else {
96 tmp = 0;
97 }
98#else
99 if (tmp & AFMT_S16_LE) {
100 tmp = AFMT_S16_LE;
101 } else if (tmp & AFMT_S16_BE) {
102 tmp = AFMT_S16_BE;
103 } else {
104 tmp = 0;
105 }
106#endif
107
108 switch(tmp) {
109 case AFMT_S16_LE:
110 s->codec_id = AV_CODEC_ID_PCM_S16LE;
111 break;
112 case AFMT_S16_BE:
113 s->codec_id = AV_CODEC_ID_PCM_S16BE;
114 break;
115 default:
116 av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
117 close(audio_fd);
118 return AVERROR(EIO);
119 }
120 err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
121 CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS)
122
123 tmp = (s->channels == 2);
124 err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
125 CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
126
127 tmp = s->sample_rate;
128 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
129 CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
130 s->sample_rate = tmp; /* store real sample rate */
131 s->fd = audio_fd;
132
133 return 0;
134 fail:
135 close(audio_fd);
136 return AVERROR(EIO);
137#undef CHECK_IOCTL_ERROR
138}
139
140int ff_oss_audio_close(OSSAudioData *s)
141{
142 close(s->fd);
143 return 0;
144}