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/*****************************************************************************
* Gnome Wave Cleaner Version 0.19
* Copyright (C) 2003 Jeffrey J. Welty
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*******************************************************************************/
/* oss interface impl. ...frank 12.09.03 */
#include <sys/ioctl.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#if defined(__OpenBSD__) || defined(__NetBSD__)
#include <soundcard.h>
#else
#include <sys/soundcard.h>
#endif
#include "audio_device.h"
static int audio_fd = -1 ;
int audio_device_open(char *output_device)
{
if( (audio_fd = open(output_device, O_WRONLY)) == -1) {
return -1;
}
return 0;
}
int audio_device_set_params(AUDIO_FORMAT *format, int *channels, int *rate)
{
int oss_format;
switch (*format)
{
case GWC_U8: oss_format = AFMT_U8; break;
case GWC_S8: oss_format = AFMT_S8; break;
case GWC_S16_BE: oss_format = AFMT_S16_BE; break;
default:
case GWC_S16_LE: oss_format = AFMT_S16_LE; break;
}
if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &oss_format) == -1) {
return -1;
}
switch (oss_format)
{
case AFMT_U8: *format = GWC_U8; break;
case AFMT_S8: *format = GWC_S8; break;
case AFMT_S16_BE: *format = GWC_S16_BE; break;
case AFMT_S16_LE: *format = GWC_S16_LE; break;
default: *format = GWC_UNKNOWN; break;
}
if (ioctl(audio_fd, SNDCTL_DSP_CHANNELS, channels) == -1) {
return -1;
}
if (ioctl(audio_fd, SNDCTL_DSP_SPEED, rate) == -1) {
return -1;
}
return 0;
}
int audio_device_read(unsigned char *buffer, int buffersize)
{
int len = read(audio_fd, buffer, buffersize);
if (len == -1)
return -1;
return len;
}
int audio_device_write(unsigned char *buffer, int buffersize)
{
int len = write(audio_fd, buffer, buffersize);
if (len == -1)
return -1;
return len;
}
void audio_device_close(int drain)
{
if(audio_fd != -1) {
ioctl(audio_fd, SNDCTL_DSP_RESET, NULL) ;
close(audio_fd) ;
audio_fd = -1 ;
}
}
/* Number of bytes processed since opening the device. */
long audio_device_processed_bytes(void)
{
count_info info;
if (audio_fd != -1) {
ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info);
return info.bytes;
}
return 0;
}
int audio_device_best_buffer_size(int playback_bytes_per_block)
{
int bufsize;
audio_buf_info oss_info;
ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &oss_info);
for (bufsize = oss_info.fragsize;
bufsize < oss_info.fragsize*oss_info.fragstotal/2;
bufsize += oss_info.fragsize)
{
if (bufsize >= playback_bytes_per_block)
break;
}
return bufsize;
}
int audio_device_nonblocking_write_buffer_size(int maxbufsize,
int playback_bytes_remaining)
{
audio_buf_info info;
int len = 0;
ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
/* g_print("fragsize:%d\n", info.fragsize) ; */
/* g_print("fragstotal:%d\n", info.fragstotal) ; */
/* g_print("bytes:%ld\n", info.bytes) ; */
len = info.fragsize*info.fragments;
while(len > maxbufsize) len -= info.fragsize;
if (len > playback_bytes_remaining) {
len = playback_bytes_remaining;
}
/* g_print("len:%d\n", len) ; */
if(len > info.bytes) {
/* g_print("No free audio buffers\n") ; */
return 0 ;
}
return len;
}
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