mirror of
https://github.com/alsa-project/alsa-tools.git
synced 2025-10-29 05:40:25 -04:00
113 lines
2.2 KiB
C
113 lines
2.2 KiB
C
/*
|
|
*
|
|
* output_linux.c
|
|
*
|
|
* Copyright (C) Aaron Holtzman - May 1999
|
|
*
|
|
* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
|
|
*
|
|
* ac3dec 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, or (at your option)
|
|
* any later version.
|
|
*
|
|
* ac3dec 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 GNU Make; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <math.h>
|
|
#if defined(__OpenBSD__)
|
|
#include <soundcard.h>
|
|
#elif defined(__FreeBSD__)
|
|
#include <machine/soundcard.h>
|
|
#else
|
|
#include <sys/soundcard.h>
|
|
#endif
|
|
#include <sys/ioctl.h>
|
|
|
|
//this sux...types should go in config.h methinks
|
|
typedef signed short sint_16;
|
|
typedef unsigned int uint_32;
|
|
|
|
#include "output.h"
|
|
|
|
|
|
static char dev[] = "/dev/dsp";
|
|
static int fd;
|
|
|
|
|
|
/*
|
|
* open the audio device for writing to
|
|
*/
|
|
int output_open(int bits, int rate, int channels)
|
|
{
|
|
int tmp;
|
|
|
|
/*
|
|
* Open the device driver
|
|
*/
|
|
|
|
fd=open(dev,O_WRONLY);
|
|
if(fd < 0)
|
|
{
|
|
fprintf(stderr,"%s: Opening audio device %s\n",
|
|
strerror(errno), dev);
|
|
goto ERR;
|
|
}
|
|
|
|
tmp = channels == 2 ? 1 : 0;
|
|
ioctl(fd,SNDCTL_DSP_STEREO,&tmp);
|
|
|
|
tmp = bits;
|
|
ioctl(fd,SNDCTL_DSP_SAMPLESIZE,&tmp);
|
|
|
|
tmp = rate;
|
|
ioctl(fd,SNDCTL_DSP_SPEED, &tmp);
|
|
|
|
//this is cheating
|
|
tmp = 256;
|
|
// ioctl(fd,SNDCTL_DSP_SETFRAGMENT,&tmp);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
ERR:
|
|
if(fd >= 0) { close(fd); }
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* play the sample to the already opened file descriptor
|
|
*/
|
|
void output_play(sint_16* output_samples, uint_32 num_bytes)
|
|
{
|
|
// if(fd < 0)
|
|
// return;
|
|
|
|
write(fd,output_samples,1024 * 6);
|
|
}
|
|
|
|
|
|
void
|
|
output_close(void)
|
|
{
|
|
close(fd);
|
|
}
|