/* 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: drv_sgi.c,v 1.1.1.1 2004/06/01 12:16:17 raph Exp $

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(CHAR *cmdline)

{

CHAR *ptr;

if ((ptr=MD_GetAtom("fragsize",cmdline,0)) != NULL) {

sgi_fragsize=atol(ptr);

free(ptr);

} else sgi_fragsize=DEFAULT_SGI_FRAGSIZE;

if ((ptr=MD_GetAtom("bufsize",cmdline,0)) != NULL) {

sgi_bufsize=atol(ptr);

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*)_mm_malloc(sgi_fragsize))) return 1;

return VC_Init();

}

static void SGI_Exit(void)

{

VC_Exit();

_mm_free(audiobuffer);

}

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",

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: */