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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: drv_dc.c,v 1.3 2011/08/05 20:30:00 raph Exp $
Driver that outputs a stream to the AICA SPU of a Dreamcast.
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mikmod_internals.h"
#ifdef DRV_DC
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <kos.h>
#include <dc/sound/stream.h>
/* Global variables */
static SBYTE sound_buffer[SND_STREAM_BUFFER_MAX]; /* Limit by SPU of Dreamcast */
static snd_stream_hnd_t shnd = -1;
static volatile int playing = 0;
static void DC_CommandLine(const CHAR *cmdline)
{
}
static BOOL DC_IsThere(void)
{
return 1;/* Always valid */
}
/* Stop SPU */
static void DC_PlayStop(void)
{
if (shnd!=-1) snd_stream_stop(shnd);
playing = 0;
VC_PlayStop();
}
/* Init SPU */
static int DC_PlayStart(void)
{
snd_stream_start(shnd, md_mixfreq, 1);
playing = 1;
if (VC_PlayStart())
return 1;
return 0;
}
/* Stop the buffer, and free resources */
static void DC_Exit(void)
{
if (shnd != -1) snd_stream_stop(shnd);
playing = 0;
/* Free the SPU stream */
if (shnd != -1) {
snd_stream_destroy(shnd);
shnd = -1;
}
snd_stream_shutdown();
sq_clr(sound_buffer, 65536);
VC_Exit();
}
/* Called by Mikmod, means that we should get data from the buffer. */
static void DC_Update(void)
{
snd_stream_poll(shnd); /* Request more data using the DC callback */
}
/* Function called by the Dreamcast SPU (polling).
* Retrieve the buffer information into "sound_buffer" variable. */
static void *sound_callback(snd_stream_hnd_t hnd, int len, int *actual)
{
if (playing) {
*actual = VC_WriteBytes(sound_buffer, len);
}
else {
memset(sound_buffer, 0, len);
*actual = len;
}
return (uint16 *)(sound_buffer);
}
static int DC_Reset(void)
{
if (shnd != -1) snd_stream_reinit(shnd, sound_callback);
return 0;
}
/* Init the SPU and the buffers */
/* MikMod variables: _mm_errno, md_mode */
static int DC_Init(void)
{
if (VC_Init()) {
return 1;
}
/* spu_wave_stream: beginning */
if (snd_stream_init() < 0) {
_mm_errno = MMERR_OPENING_AUDIO;
return 1;
}
/* Prepare buffer with a callback */
shnd = snd_stream_alloc(sound_callback, SND_STREAM_BUFFER_MAX);
if (shnd == SND_STREAM_INVALID) {
_mm_errno = MMERR_OPENING_AUDIO;
return 1;
}
/* Mikmod mode */
/* md_mixfreq by default is 44100 (depends of app). */
md_mode |= DMODE_STEREO;
return 0;
}
MIKMODAPI MDRIVER drv_dc = {
NULL,
"DC",
"Dreamcast AICA SPU driver v1.0",
0,255,
"dc",
NULL,
DC_CommandLine,
DC_IsThere,
VC_SampleLoad,
VC_SampleUnload,
VC_SampleSpace,
VC_SampleLength,
DC_Init,
DC_Exit,
DC_Reset,
VC_SetNumVoices,
DC_PlayStart,
DC_PlayStop,
DC_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_dc);
#endif
/* ex:set ts=4: */
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