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/* MikMod sound library
(c) 1998, 1999 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 SoundBlaster/Pro/16/AWE32 under DOS
==============================================================================*/
/*
Written by Andrew Zabolotny <bit@eltech.ru>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef DRV_SB
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "mikmod_internals.h"
#include "dossb.h"
static void SB_CommandLine(const CHAR *cmdline)
{
char *ptr, *end;
if ((ptr=MD_GetAtom("port",cmdline,0)) != NULL) {
sb.port = strtol(ptr, &end, 16);
MikMod_free(ptr);
}
if ((ptr=MD_GetAtom("irq",cmdline,0)) != NULL) {
sb.irq = strtol(ptr, &end, 10);
MikMod_free(ptr);
}
if ((ptr=MD_GetAtom("dma",cmdline,0)) != NULL) {
sb.dma8 = strtol(ptr, &end, 10);
MikMod_free(ptr);
}
if ((ptr=MD_GetAtom("hidma",cmdline,0)) != NULL) {
sb.dma16 = strtol(ptr, &end, 10);
MikMod_free(ptr);
}
}
static BOOL SB_IsThere(void)
{
return sb_detect();
}
static int SB_Init(void)
{
if (!sb_open()) {
_mm_errno = MMERR_INVALID_DEVICE;
return 1;
}
/* Adjust md_mode according to sound card capabilities */
if (!(sb.caps & SBMODE_STEREO))
md_mode &= ~DMODE_STEREO;
if (!(sb.caps & SBMODE_16BITS))
md_mode &= ~DMODE_16BITS;
if (md_mixfreq < 4000)
md_mixfreq = 4000;
if (md_mode & DMODE_STEREO) {
if (md_mixfreq > sb.maxfreq_stereo)
md_mixfreq = sb.maxfreq_stereo;
} else {
if (md_mixfreq > sb.maxfreq_mono)
md_mixfreq = sb.maxfreq_mono;
}
return VC_Init();
}
static void SB_Exit(void)
{
VC_Exit();
sb_close();
}
/* The last buffer byte filled with sound */
static unsigned int buff_tail = 0;
static void SB_Callback(void)
{
unsigned int dma_size, dma_pos;
ULONG (*mixer)(SBYTE *buf, ULONG todo);
sb_query_dma(&dma_size, &dma_pos);
/* There isn't much sense in filling less than 256 bytes */
dma_pos &= ~255;
/* If nothing to mix, quit */
if (buff_tail == dma_pos)
return;
if (Player_Paused_internal())
mixer = VC_SilenceBytes;
else
mixer = VC_WriteBytes;
/* If DMA pointer still didn't wrapped around ... */
if (dma_pos > buff_tail) {
buff_tail += mixer ((SBYTE *)(sb.dma_buff->linear + buff_tail), dma_pos - buff_tail);
/* If we arrived right to the DMA buffer end, jump to the beginning */
if (buff_tail >= dma_size)
buff_tail = 0;
} else {
/* If wrapped around, fill first to the end of buffer */
mixer ((SBYTE *)(sb.dma_buff->linear + buff_tail), dma_size - buff_tail);
/* Now fill from buffer beginning to current DMA pointer */
buff_tail = mixer ((SBYTE *)sb.dma_buff->linear, dma_pos);
}
}
static void SB_Update(void)
{
/* Do nothing: the real update is done during SB interrupts */
}
static int SB_PlayStart (void)
{
if (VC_PlayStart())
return 1;
/* Enable speaker output */
sb_output(TRUE);
/* Set our routine to be called during SB IRQs */
buff_tail = 0;
sb.timer_callback = SB_Callback;
/* Start cyclic DMA transfer */
if (!sb_start_dma(((md_mode & DMODE_16BITS) ? SBMODE_16BITS | SBMODE_SIGNED : 0) |
((md_mode & DMODE_STEREO) ? SBMODE_STEREO : 0), md_mixfreq))
{
_mm_errno = MMERR_DOSSB_STARTDMA;
return 1;
}
return 0;
}
static int SB_Reset(void)
{
sb_reset();
VC_Exit();
return VC_Init();
}
static void SB_PlayStop(void)
{
sb.timer_callback = NULL;
sb_output(FALSE);
sb_stop_dma();
VC_PlayStop();
}
MDRIVER drv_sb =
{
NULL,
"Sound Blaster",
"Sound Blaster Orig/2.0/Pro/16 v1.0",
0, 255,
"sb",
"port:c:220,230,240,250,260,270,280,32C,530,604,E80,F40,220:Sound Blaster base I/O port\n"
"irq:c:2,3,5,7,10,5:Sound Blaster IRQ\n"
"dma:c:0,1,3,1:Sound Blaster 8 bit DMA channel\n"
"hidma:c:5,6,7,5:Sound Blaster 16 bit DMA channel (SB16/AWE32 only)\n",
SB_CommandLine,
SB_IsThere,
VC_SampleLoad,
VC_SampleUnload,
VC_SampleSpace,
VC_SampleLength,
SB_Init,
SB_Exit,
SB_Reset,
VC_SetNumVoices,
SB_PlayStart,
SB_PlayStop,
SB_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 /* DRV_SB */
#include "mikmod_internals.h"
MISSING(drv_sb);
#endif
/* ex:set ts=4: */
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