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/* wiisound.c: Wii sound routines
Copyright (c) 2008-2009 Bjoern Giesler, Philip Kendall
$Id: wiisound.c 3945 2009-01-10 18:44:42Z zubzero $
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <string.h>
#include <unistd.h>
#include "fuse.h"
#include "sfifo.h"
#include <gccore.h>
#include <ogc/audio.h>
#ifndef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
int samplerate;
int streamstate;
sfifo_t sound_fifo;
#define BUFSIZE 16384
u8 dmabuf[BUFSIZE<<1] ATTRIBUTE_ALIGN(32);
int dmalen = BUFSIZE;
static void
sound_dmacallback( void )
{
if( sfifo_used( &sound_fifo ) < 128) return;
dmalen = MIN( BUFSIZE, sfifo_used( &sound_fifo ) );
sfifo_read( &sound_fifo, dmabuf, dmalen );
DCFlushRange( dmabuf, dmalen );
AUDIO_InitDMA( (u32)dmabuf, dmalen );
AUDIO_StartDMA();
}
int
sound_lowlevel_init( const char *device, int *freqptr, int *stereoptr )
{
switch(*freqptr) {
case 32000:
samplerate = AI_SAMPLERATE_32KHZ;
break;
case 48000:
samplerate = AI_SAMPLERATE_48KHZ;
break;
default:
printf("Sample rate %d not supported on Wii\n", *freqptr);
return 1;
}
sfifo_init( &sound_fifo, BUFSIZE );
*stereoptr = 1;
AUDIO_Init( NULL );
AUDIO_SetDSPSampleRate( samplerate );
#ifndef DISPLAY_AUDIO
AUDIO_RegisterDMACallback( sound_dmacallback );
memset( dmabuf, 0, BUFSIZE );
AUDIO_InitDMA( (u32)dmabuf, BUFSIZE );
DCFlushRange( dmabuf, dmalen );
AUDIO_StartDMA();
#endif
return 0;
}
void
sound_lowlevel_end( void )
{
sfifo_flush( &sound_fifo );
sfifo_close( &sound_fifo );
AUDIO_StopDMA();
}
void
sound_lowlevel_frame(libspectrum_signed_word *data, int len)
{
int i;
libspectrum_signed_byte *bytes = (libspectrum_signed_byte*)data;
len <<= 1;
while(len) {
if( ( i = sfifo_write( &sound_fifo, bytes, len ) ) < 0 )
break;
else if( !i )
usleep(10000);
bytes += i;
len -= i;
}
}
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