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TRACKER4.6
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Sgi
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audio.c
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1994-11-24
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/* sgi/audio.c
vi:ts=3 sw=3:
*/
/* $Id: audio.c,v 4.0 1994/01/11 18:01:04 espie Exp espie $
* $Log: audio.c,v $
* Revision 4.0 1994/01/11 18:01:04 espie
* Changed name.
*
* Revision 1.1 1993/12/26 00:55:53 Espie
* Initial revision
*
* Revision 3.8 1993/12/04 16:12:50 espie
* BOOL -> boolean.
*
* Revision 3.7 1993/11/11 20:00:03 espie
* Amiga support.
*
* Revision 3.6 1993/07/14 16:33:41 espie
* Added stuff.
*
* Revision 3.5 1993/05/09 14:06:03 espie
* Corrected mix problem.
*
* Revision 3.4 1992/11/27 10:29:00 espie
* General cleanup
*
* Revision 3.3 1992/11/24 10:51:19 espie
* Added pseudo discardbuffer.
*
* Revision 3.2 1992/11/22 17:20:01 espie
* Checks for finetune ?
*
* Revision 3.1 1992/11/19 20:44:47 espie
* Protracker commands.
*
* Revision 3.0 1992/11/18 16:08:05 espie
* New release.
*
* Revision 2.11 1992/11/17 15:38:00 espie
* Dummy discard_buffer()
* Changed sync_audio value again.
* Added synchro for dump.
* Bug fix: must ask new frequency after we tried to set it to get it
* rounded up.
* Added stereo option (kind of).
* Separated mix/stereo stuff.
* Checked buffer size.
* Added possibility to get back to MONO for the sgi.
* Added stereo capabilities to the indigo version.
* Ask the frequency to the audio device.
* Corrected bug: when closing audio,
* we now wait for the samples queue to be empty.
*/
#include <audio.h>
#include <malloc.h>
#include <stdio.h>
#include "defs.h"
#include "extern.h"
XT int sginap(long ticks);
ID("$Id: audio.c,v 4.0 1994/01/11 18:01:04 espie Exp espie $")
LOCAL signed short *buffer;
LOCAL int index;
LOCAL int number;
LOCAL int sync = FALSE;
LOCAL ALport audio;
LOCAL ALconfig config;
LOCAL int donotwait = FALSE;
LOCAL long chpars[] = {AL_OUTPUT_RATE, 0};
LOCAL int stereo; /* are we playing stereo or not ? */
/* 256th of primary/secondary source for that side. */
LOCAL int primary, secondary;
void set_mix(percent)
int percent;
{
percent *= 256;
percent /= 100;
primary = percent;
secondary = 512 - percent;
}
int open_audio(f, s)
int f, s;
{
donotwait = FALSE;
chpars[1] = f;
if (f != 0)
ALsetparams(AL_DEFAULT_DEVICE, chpars, 2);
ALgetparams(AL_DEFAULT_DEVICE, chpars, 2);
config = ALnewconfig();
stereo = s;
if (stereo)
{
ALsetchannels(config, AL_STEREO);
number = 2;
}
else
{
ALsetchannels(config, AL_MONO);
number = 1;
}
ALsetwidth(config, AL_SAMPLE_16);
audio = ALopenport("soundtracker mono", "w", config);
index = 0;
buffer = malloc(sizeof(signed short) * number * chpars[1]);
return chpars[1];
}
void set_synchro(s)
int s;
{
sync = s;
}
int update_frequency()
{
int oldfreq;
oldfreq = chpars[1];
ALgetparams(AL_DEFAULT_DEVICE, chpars, 2);
if (chpars[1] != oldfreq)
{
buffer = realloc(buffer, sizeof(signed short) * number * chpars[1]);
return chpars[1];
}
else
return 0;
}
void output_samples(int left, int right)
{
if (stereo)
{
buffer[index++] = (left * primary + right * secondary)/256;
buffer[index++] = (right * primary + left * secondary)/256;
}
else
buffer[index++] = left + right;
}
void flush_buffer(void)
{
ALwritesamps(audio, buffer, index);
if (sync)
while(ALgetfilled(audio) > index * 10)
/* busy wait */
;
index = 0;
}
void discard_buffer(void)
{
donotwait = TRUE;
/* mostly not implemented, only working when using close_audio
* right after
*/
}
void close_audio(void)
{
if (!donotwait)
{
while(ALgetfilled(audio) != 0)
sginap(1);
}
ALcloseport(audio);
ALfreeconfig(config);
free(buffer);
}