avdevice: Add missing header for NULL_IF_CONFIG_SMALL
[libav.git] / libavdevice / oss.c
1 /*
2 * Linux audio play and grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
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 "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 #include <unistd.h>
33 #include <fcntl.h>
34 #include <sys/ioctl.h>
35
36 #include "libavutil/log.h"
37
38 #include "libavcodec/avcodec.h"
39
40 #include "libavformat/avformat.h"
41
42 #include "oss.h"
43
44 int ff_oss_audio_open(AVFormatContext *s1, int is_output,
45 const char *audio_device)
46 {
47 OSSAudioData *s = s1->priv_data;
48 int audio_fd;
49 int tmp, err;
50 char *flip = getenv("AUDIO_FLIP_LEFT");
51 char errbuff[128];
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) {
58 av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, strerror(errno));
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 fcntl(audio_fd, F_SETFL, O_NONBLOCK);
69
70 s->frame_size = OSS_AUDIO_BLOCK_SIZE;
71
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);
84
85 #if HAVE_BIGENDIAN
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:
105 s->codec_id = AV_CODEC_ID_PCM_S16LE;
106 break;
107 case AFMT_S16_BE:
108 s->codec_id = AV_CODEC_ID_PCM_S16BE;
109 break;
110 default:
111 av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
112 close(audio_fd);
113 return AVERROR(EIO);
114 }
115 err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
116 CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS)
117
118 tmp = (s->channels == 2);
119 err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
120 CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
121
122 tmp = s->sample_rate;
123 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
124 CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
125 s->sample_rate = tmp; /* store real sample rate */
126 s->fd = audio_fd;
127
128 return 0;
129 fail:
130 close(audio_fd);
131 return AVERROR(EIO);
132 #undef CHECK_IOCTL_ERROR
133 }
134
135 int ff_oss_audio_close(OSSAudioData *s)
136 {
137 close(s->fd);
138 return 0;
139 }