1f8b5e762cd58db77000191d93be9ed00883fc08
2 * Linux audio play and grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
27 #include <soundcard.h>
29 #include <sys/soundcard.h>
36 #include <sys/ioctl.h>
38 #include "libavutil/log.h"
40 #include "libavcodec/avcodec.h"
43 #include "oss_audio.h"
45 int ff_oss_audio_open(AVFormatContext
*s1
, int is_output
,
46 const char *audio_device
)
48 OSSAudioData
*s
= s1
->priv_data
;
51 char *flip
= getenv("AUDIO_FLIP_LEFT");
54 audio_fd
= avpriv_open(audio_device
, O_WRONLY
);
56 audio_fd
= avpriv_open(audio_device
, O_RDONLY
);
58 av_log(s1
, AV_LOG_ERROR
, "%s: %s\n", audio_device
, av_err2str(AVERROR(errno
)));
62 if (flip
&& *flip
== '1') {
66 /* non blocking mode */
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
)));
73 s
->frame_size
= OSS_AUDIO_BLOCK_SIZE
;
75 #define CHECK_IOCTL_ERROR(event) \
77 av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\
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
85 err
= ioctl(audio_fd
, SNDCTL_DSP_GETFMTS
, &tmp
);
87 av_log(s1
, AV_LOG_WARNING
, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno
)));
91 if (tmp
& AFMT_S16_BE
) {
93 } else if (tmp
& AFMT_S16_LE
) {
99 if (tmp
& AFMT_S16_LE
) {
101 } else if (tmp
& AFMT_S16_BE
) {
110 s
->codec_id
= AV_CODEC_ID_PCM_S16LE
;
113 s
->codec_id
= AV_CODEC_ID_PCM_S16BE
;
116 av_log(s1
, AV_LOG_ERROR
, "Soundcard does not support 16 bit sample format\n");
120 err
=ioctl(audio_fd
, SNDCTL_DSP_SETFMT
, &tmp
);
121 CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS
)
123 tmp
= (s
->channels
== 2);
124 err
= ioctl(audio_fd
, SNDCTL_DSP_STEREO
, &tmp
);
125 CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO
)
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 */
137 #undef CHECK_IOCTL_ERROR
140 int ff_oss_audio_close(OSSAudioData
*s
)