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#include <config.h>
#include <useconfig.h>
#include <stdio.h>
#include <math.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "proto.h"
#include "getargs.h"
#include "hplay.h"
#define SAMP_RATE 8000
long samp_rate = SAMP_RATE;
/* Audio Parameters */
static int dev_fd = -1;
/* file descriptor for audio device */
char *dev_file = "/dev/dsp";
static int linear_fd = -1;
static char *linear_file = NULL;
char *prog = "hplay";
static int
audio_open(void)
{
dev_fd = open(dev_file, O_WRONLY | O_NDELAY);
if (dev_fd < 0)
{
perror(dev_file);
return 0;
}
return 1;
}
int
audio_init(int argc, char *argv[])
{
int rate_set = 0;
int use_audio = 1;
prog = argv[0];
argc = getargs("linux Audio",argc, argv,
"r", "%d", &rate_set, "Sample rate",
"a", NULL, &use_audio, "Audio enable",
NULL);
if (help_only)
return argc;
if (use_audio)
audio_open();
if (rate_set)
samp_rate = rate_set;
if (dev_fd > 0)
{
ioctl(dev_fd, SNDCTL_DSP_SPEED, &samp_rate);
}
return argc;
}
void
audio_term()
{
int dummy;
/* Close audio system */
if (dev_fd >= 0)
{
ioctl(dev_fd, SNDCTL_DSP_SYNC, &dummy);
close(dev_fd);
dev_fd = -1;
}
/* Finish linear file */
if (linear_fd >= 0)
{
ftruncate(linear_fd, lseek(linear_fd, 0L, SEEK_CUR));
close(linear_fd);
linear_fd = -1;
}
}
void
audio_play(int n, short *data)
{
if (n > 0)
{
unsigned char *converted = (unsigned char *) malloc(n);
int i;
if (converted == NULL)
{
fprintf(stderr, "Could not allocate memory for conversion\n");
exit(3);
}
for (i = 0; i < n; i++)
converted[i] = (data[i] - 32768) / 256;
if (linear_fd >= 0)
{
if (write(linear_fd, converted, n) != n)
perror("write");
}
if (dev_fd >= 0)
{
if (write(dev_fd, converted, n) != n)
perror("write");
}
free(converted);
}
}
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