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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#if HAVE_SYS_SOUNDCARD_H
#include <sys/soundcard.h>
#else
#if HAVE_SOUNDCARD_H
#include <soundcard.h>
#else
#include <linux/soundcard.h>
#endif
#endif
#include "osdep/io.h"
#include "audio_in.h"
#include "common/common.h"
#include "common/msg.h"
int ai_oss_set_samplerate(audio_in_t *ai)
{
int tmp = ai->req_samplerate;
if (ioctl(ai->oss.audio_fd, SNDCTL_DSP_SPEED, &tmp) == -1) return -1;
ai->samplerate = tmp;
return 0;
}
int ai_oss_set_channels(audio_in_t *ai)
{
int err;
int ioctl_param;
if (ai->req_channels > 2)
{
ioctl_param = ai->req_channels;
MP_VERBOSE(ai, "ioctl dsp channels: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_CHANNELS, &ioctl_param));
if (err < 0) {
MP_ERR(ai, "Unable to set channel count: %d\n",
ai->req_channels);
return -1;
}
ai->channels = ioctl_param;
}
else
{
ioctl_param = (ai->req_channels == 2);
MP_VERBOSE(ai, "ioctl dsp stereo: %d (req: %d)\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_STEREO, &ioctl_param),
ioctl_param);
if (err < 0) {
MP_ERR(ai, "Unable to set stereo: %d\n",
ai->req_channels == 2);
return -1;
}
ai->channels = ioctl_param ? 2 : 1;
}
return 0;
}
int ai_oss_init(audio_in_t *ai)
{
int err;
int ioctl_param;
ai->oss.audio_fd = open(ai->oss.device, O_RDONLY | O_CLOEXEC);
if (ai->oss.audio_fd < 0)
{
MP_ERR(ai, "Unable to open '%s': %s\n",
ai->oss.device, mp_strerror(errno));
return -1;
}
ioctl_param = 0 ;
MP_VERBOSE(ai, "ioctl dsp getfmt: %d\n",
ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETFMTS, &ioctl_param));
MP_VERBOSE(ai, "Supported formats: %x\n", ioctl_param);
if (!(ioctl_param & AFMT_S16_NE))
MP_ERR(ai, "unsupported format\n");
ioctl_param = AFMT_S16_NE;
MP_VERBOSE(ai, "ioctl dsp setfmt: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SETFMT, &ioctl_param));
if (err < 0) {
MP_ERR(ai, "Unable to set audio format.");
return -1;
}
if (ai_oss_set_channels(ai) < 0) return -1;
ioctl_param = ai->req_samplerate;
MP_VERBOSE(ai, "ioctl dsp speed: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SPEED, &ioctl_param));
if (err < 0) {
MP_ERR(ai, "Unable to set samplerate: %d\n",
ai->req_samplerate);
return -1;
}
ai->samplerate = ioctl_param;
MP_VERBOSE(ai, "ioctl dsp trigger: %d\n",
ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETTRIGGER, &ioctl_param));
MP_VERBOSE(ai, "trigger: %x\n", ioctl_param);
ioctl_param = PCM_ENABLE_INPUT;
MP_VERBOSE(ai, "ioctl dsp trigger: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SETTRIGGER, &ioctl_param));
if (err < 0) {
MP_ERR(ai, "Unable to set trigger: %d\n",
PCM_ENABLE_INPUT);
}
ai->blocksize = 0;
MP_VERBOSE(ai, "ioctl dsp getblocksize: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETBLKSIZE, &ai->blocksize));
if (err < 0) {
MP_ERR(ai, "Unable to get block size!\n");
}
MP_VERBOSE(ai, "blocksize: %d\n", ai->blocksize);
// correct the blocksize to a reasonable value
if (ai->blocksize <= 0) {
ai->blocksize = 4096*ai->channels*2;
MP_ERR(ai, "Audio block size is zero, setting to %d!\n", ai->blocksize);
} else if (ai->blocksize < 4096*ai->channels*2) {
ai->blocksize *= 4096*ai->channels*2/ai->blocksize;
MP_ERR(ai, "Audio block size too low, setting to %d!\n", ai->blocksize);
}
ai->samplesize = 16;
ai->bytes_per_sample = 2;
return 0;
}
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