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/* MikMod sound library
(c) 1998, 1999, 2000 Miodrag Vallat and others - see file AUTHORS for
complete list.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
/*==============================================================================
$Id$
Driver for output on SGI audio system (needs libaudio from the dmedia
package).
==============================================================================*/
/*
Written by Stephan Kanthak <kanthak@i6.informatik.rwth-aachen.de>
Fragment configuration:
=======================
You can use the driver options fragsize and bufsize to override the
default size of the audio buffer. If you experience crackles & pops,
try experimenting with these values.
Please read the SGI section of libmikmod's README file first before
contacting the author because there are some things to know about the
specials of the SGI audio driver.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mikmod_internals.h"
#ifdef DRV_SGI
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <dmedia/audio.h>
#define DEFAULT_SGI_FRAGSIZE 20000
#define DEFAULT_SGI_BUFSIZE 40000
static ALconfig sgi_config;
static ALport sgi_port;
static int sample_factor;
static int sgi_fragsize=DEFAULT_SGI_FRAGSIZE;
static int sgi_bufsize=DEFAULT_SGI_BUFSIZE;
static SBYTE *audiobuffer=NULL;
static void SGI_CommandLine(const CHAR *cmdline)
{
CHAR *ptr;
if ((ptr=MD_GetAtom("fragsize",cmdline,0)) != NULL) {
sgi_fragsize=atol(ptr);
MikMod_free(ptr);
} else sgi_fragsize=DEFAULT_SGI_FRAGSIZE;
if ((ptr=MD_GetAtom("bufsize",cmdline,0)) != NULL) {
sgi_bufsize=atol(ptr);
MikMod_free(ptr);
} else sgi_bufsize=DEFAULT_SGI_BUFSIZE;
}
static BOOL SGI_IsThere(void)
{
ALseterrorhandler(0);
return(ALqueryparams(AL_DEFAULT_DEVICE,0,0))?1:0;
}
static int SGI_Init(void)
{
long chpars[] = { AL_OUTPUT_RATE, AL_RATE_22050 };
switch(md_mixfreq) {
case 8000:
chpars[1] = AL_RATE_8000;
break;
case 11025:
chpars[1] = AL_RATE_11025;
break;
case 16000:
chpars[1] = AL_RATE_16000;
break;
case 22050:
chpars[1] = AL_RATE_22050;
break;
case 32000:
chpars[1] = AL_RATE_32000;
break;
case 44100:
chpars[1] = AL_RATE_44100;
break;
case 48000:
chpars[1] = AL_RATE_48000;
break;
default:
_mm_errno=MMERR_SGI_SPEED;
return 1;
}
ALseterrorhandler(0);
ALsetparams(AL_DEFAULT_DEVICE, chpars, 2);
if (!(sgi_config=ALnewconfig())) {
_mm_errno=MMERR_OPENING_AUDIO;
return 1;
}
if (md_mode&DMODE_16BITS) {
if (ALsetwidth(sgi_config,AL_SAMPLE_16)<0) {
_mm_errno=MMERR_SGI_16BIT;
return 1;
}
sample_factor = 1;
} else {
if (ALsetwidth(sgi_config,AL_SAMPLE_8)<0) {
_mm_errno=MMERR_SGI_8BIT;
return 1;
}
sample_factor = 0;
}
if (md_mode&DMODE_STEREO) {
if (ALsetchannels(sgi_config,AL_STEREO)<0) {
_mm_errno=MMERR_SGI_STEREO;
return 1;
}
} else {
if (ALsetchannels(sgi_config,AL_MONO)<0) {
_mm_errno=MMERR_SGI_MONO;
return 1;
}
}
if ((getenv("MM_SGI_FRAGSIZE"))&&(sgi_fragsize!=DEFAULT_SGI_FRAGSIZE))
sgi_fragsize=atol(getenv("MM_SGI_FRAGSIZE"));
if (!sgi_fragsize) sgi_fragsize=DEFAULT_SGI_FRAGSIZE;
if ((getenv("MM_SGI_BUFSIZE"))&&(sgi_bufsize!=DEFAULT_SGI_BUFSIZE))
sgi_bufsize=atol(getenv("MM_SGI_BUFSIZE"));
if (!sgi_bufsize) sgi_fragsize=DEFAULT_SGI_BUFSIZE;
ALsetqueuesize(sgi_config, sgi_bufsize);
if (!(sgi_port=ALopenport("libmikmod","w",sgi_config))) {
_mm_errno=MMERR_OPENING_AUDIO;
return 1;
}
if(!(audiobuffer=(SBYTE*)MikMod_malloc(sgi_fragsize))) return 1;
return VC_Init();
}
static void SGI_Exit(void)
{
VC_Exit();
MikMod_free(audiobuffer);
audiobuffer=NULL;
}
static void SGI_Update(void)
{
ALwritesamps(sgi_port,audiobuffer,
VC_WriteBytes(audiobuffer,sgi_fragsize)>>sample_factor);
}
MIKMODAPI MDRIVER drv_sgi={
NULL,
"SGI Audio System",
"SGI Audio System driver v0.5",
0,255,
"sgi",
"fragsize:r:0,99999,20000:Sound buffer fragment size\n"
"bufsize:r:0,199999,40000:Sound buffer total size\n",
SGI_CommandLine,
SGI_IsThere,
VC_SampleLoad,
VC_SampleUnload,
VC_SampleSpace,
VC_SampleLength,
SGI_Init,
SGI_Exit,
NULL,
VC_SetNumVoices,
VC_PlayStart,
VC_PlayStop,
SGI_Update,
NULL,
VC_VoiceSetVolume,
VC_VoiceGetVolume,
VC_VoiceSetFrequency,
VC_VoiceGetFrequency,
VC_VoiceSetPanning,
VC_VoiceGetPanning,
VC_VoicePlay,
VC_VoiceStop,
VC_VoiceStopped,
VC_VoiceGetPosition,
VC_VoiceRealVolume
};
#else
MISSING(drv_sgi);
#endif
/* ex:set ts=4: */
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