--- /dev/null
+/* 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_BUFSIZE 40000
+#define DEFAULT_SGI_FRAGSIZE (DEFAULT_SGI_BUFSIZE / 2)
+
+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: */
projects / dosdemo / blobdiff