137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
|
|
* Linux audio play and grab interface
|
|
* Copyright (c) 2000, 2001 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <string.h>
|
|
|
|
#if HAVE_SOUNDCARD_H
|
|
#include <soundcard.h>
|
|
#else
|
|
#include <sys/soundcard.h>
|
|
#endif
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include "libavutil/log.h"
|
|
|
|
#include "libavcodec/avcodec.h"
|
|
|
|
#include "libavformat/avformat.h"
|
|
|
|
#include "oss_audio.h"
|
|
|
|
int ff_oss_audio_open(AVFormatContext *s1, int is_output,
|
|
const char *audio_device)
|
|
{
|
|
OSSAudioData *s = s1->priv_data;
|
|
int audio_fd;
|
|
int tmp, err;
|
|
char *flip = getenv("AUDIO_FLIP_LEFT");
|
|
|
|
if (is_output)
|
|
audio_fd = avpriv_open(audio_device, O_WRONLY);
|
|
else
|
|
audio_fd = avpriv_open(audio_device, O_RDONLY);
|
|
if (audio_fd < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, strerror(errno));
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if (flip && *flip == '1') {
|
|
s->flip_left = 1;
|
|
}
|
|
|
|
/* non blocking mode */
|
|
if (!is_output)
|
|
fcntl(audio_fd, F_SETFL, O_NONBLOCK);
|
|
|
|
s->frame_size = OSS_AUDIO_BLOCK_SIZE;
|
|
|
|
/* select format : favour native format */
|
|
err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
|
|
|
|
#if HAVE_BIGENDIAN
|
|
if (tmp & AFMT_S16_BE) {
|
|
tmp = AFMT_S16_BE;
|
|
} else if (tmp & AFMT_S16_LE) {
|
|
tmp = AFMT_S16_LE;
|
|
} else {
|
|
tmp = 0;
|
|
}
|
|
#else
|
|
if (tmp & AFMT_S16_LE) {
|
|
tmp = AFMT_S16_LE;
|
|
} else if (tmp & AFMT_S16_BE) {
|
|
tmp = AFMT_S16_BE;
|
|
} else {
|
|
tmp = 0;
|
|
}
|
|
#endif
|
|
|
|
switch(tmp) {
|
|
case AFMT_S16_LE:
|
|
s->codec_id = AV_CODEC_ID_PCM_S16LE;
|
|
break;
|
|
case AFMT_S16_BE:
|
|
s->codec_id = AV_CODEC_ID_PCM_S16BE;
|
|
break;
|
|
default:
|
|
av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
|
|
close(audio_fd);
|
|
return AVERROR(EIO);
|
|
}
|
|
err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
|
|
if (err < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_SETFMT: %s\n", strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
tmp = (s->channels == 2);
|
|
err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
|
|
if (err < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_STEREO: %s\n", strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
tmp = s->sample_rate;
|
|
err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
|
|
if (err < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
|
|
goto fail;
|
|
}
|
|
s->sample_rate = tmp; /* store real sample rate */
|
|
s->fd = audio_fd;
|
|
|
|
return 0;
|
|
fail:
|
|
close(audio_fd);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
int ff_oss_audio_close(OSSAudioData *s)
|
|
{
|
|
close(s->fd);
|
|
return 0;
|
|
}
|