oss_audio: use a macro to simplify ioctl() error checking
[libav.git] / libavdevice / oss_audio.c
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1/*
2 * Linux audio play and grab interface
406792e7 3 * Copyright (c) 2000, 2001 Fabrice Bellard
de6d9b64 4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
2912e87a 18 * License along with Libav; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
8be1c656 21
4f786086 22#include "config.h"
d6e1d371 23
de6d9b64 24#include <string.h>
d6e1d371 25
b250f9c6 26#if HAVE_SOUNDCARD_H
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27#include <soundcard.h>
28#else
b13788c5 29#include <sys/soundcard.h>
8c802695 30#endif
d6e1d371 31
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32#include <unistd.h>
33#include <fcntl.h>
34#include <sys/ioctl.h>
de6d9b64 35
245976da 36#include "libavutil/log.h"
d6e1d371 37
245976da 38#include "libavcodec/avcodec.h"
4f786086 39
d6e1d371 40#include "libavformat/avformat.h"
4972b26f 41
d6e1d371 42#include "oss_audio.h"
de6d9b64 43
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44int ff_oss_audio_open(AVFormatContext *s1, int is_output,
45 const char *audio_device)
de6d9b64 46{
d6e1d371 47 OSSAudioData *s = s1->priv_data;
4972b26f 48 int audio_fd;
de6d9b64 49 int tmp, err;
1de1cce2 50 char *flip = getenv("AUDIO_FLIP_LEFT");
b7c77912 51 char errbuff[128];
de6d9b64 52
4972b26f 53 if (is_output)
71bf6b41 54 audio_fd = avpriv_open(audio_device, O_WRONLY);
de6d9b64 55 else
71bf6b41 56 audio_fd = avpriv_open(audio_device, O_RDONLY);
de6d9b64 57 if (audio_fd < 0) {
0c26e964 58 av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, strerror(errno));
6f3e0b21 59 return AVERROR(EIO);
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60 }
61
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62 if (flip && *flip == '1') {
63 s->flip_left = 1;
64 }
65
de6d9b64 66 /* non blocking mode */
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67 if (!is_output)
68 fcntl(audio_fd, F_SETFL, O_NONBLOCK);
de6d9b64 69
d6e1d371 70 s->frame_size = OSS_AUDIO_BLOCK_SIZE;
de6d9b64 71
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72#define CHECK_IOCTL_ERROR(event) \
73 if (err < 0) { \
74 av_strerror(AVERROR(errno), errbuff, sizeof(errbuff)); \
75 av_log(s1, AV_LOG_ERROR, #event ": %s\n", errbuff); \
76 goto fail; \
77 }
78
79 /* select format : favour native format
80 * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be
81 * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to
82 * fail anyway. */
83 (void) ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
115329f1 84
63613fe6 85#if HAVE_BIGENDIAN
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86 if (tmp & AFMT_S16_BE) {
87 tmp = AFMT_S16_BE;
88 } else if (tmp & AFMT_S16_LE) {
89 tmp = AFMT_S16_LE;
90 } else {
91 tmp = 0;
92 }
93#else
94 if (tmp & AFMT_S16_LE) {
95 tmp = AFMT_S16_LE;
96 } else if (tmp & AFMT_S16_BE) {
97 tmp = AFMT_S16_BE;
98 } else {
99 tmp = 0;
100 }
101#endif
102
103 switch(tmp) {
104 case AFMT_S16_LE:
36ef5369 105 s->codec_id = AV_CODEC_ID_PCM_S16LE;
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106 break;
107 case AFMT_S16_BE:
36ef5369 108 s->codec_id = AV_CODEC_ID_PCM_S16BE;
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109 break;
110 default:
0c26e964 111 av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
4972b26f 112 close(audio_fd);
6f3e0b21 113 return AVERROR(EIO);
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114 }
115 err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
b7c77912 116 CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS)
115329f1 117
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118 tmp = (s->channels == 2);
119 err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
b7c77912 120 CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
115329f1 121
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122 tmp = s->sample_rate;
123 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
b7c77912 124 CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
4972b26f 125 s->sample_rate = tmp; /* store real sample rate */
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126 s->fd = audio_fd;
127
128 return 0;
129 fail:
130 close(audio_fd);
6f3e0b21 131 return AVERROR(EIO);
b7c77912 132#undef CHECK_IOCTL_ERROR
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133}
134
d6e1d371 135int ff_oss_audio_close(OSSAudioData *s)
de6d9b64 136{
de6d9b64 137 close(s->fd);
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138 return 0;
139}