blob: d74112825bf3006b0ac0d0be05ec9e91a67172be
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.h" |
44 | |
45 | int 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) { |
58 | av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(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 | if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) { |
69 | av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno))); |
70 | } |
71 | } |
72 | |
73 | s->frame_size = OSS_AUDIO_BLOCK_SIZE; |
74 | |
75 | #define CHECK_IOCTL_ERROR(event) \ |
76 | if (err < 0) { \ |
77 | av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\ |
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 |
84 | * fail anyway. */ |
85 | err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp); |
86 | if (err < 0) { |
87 | av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno))); |
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 | |
140 | int ff_oss_audio_close(OSSAudioData *s) |
141 | { |
142 | close(s->fd); |
143 | return 0; |
144 | } |
145 |