void SoundSetup( BlackBox* sndeng, int srate, int bufsize ){
GenSoundEngine = sndeng;
mm_ds_system* sys = (mm_ds_system*)malloc( sizeof( mm_ds_system) );
sys->mod_count = 0;
sys->samp_count = 0;
sys->mem_bank = 0;
sys->fifo_channel = FIFO_MAXMOD;
mmInit( sys );
//----------------------------------------------------------------
// open stream
//----------------------------------------------------------------
mm_stream* mystream = (mm_stream*)malloc( sizeof( mm_stream ) );
mystream->sampling_rate = srate; // sampling rate = 25khz
mystream->buffer_length = bufsize; // buffer length = 1200 samples
mystream->callback = on_stream_request; // set callback function
mystream->format = MM_STREAM_16BIT_STEREO; // format = stereo 16-bit
mystream->timer = MM_TIMER0; // use hardware timer 0
mystream->manual = false; // use automatic filling
mmStreamOpen( mystream );
}
int initAudio()
{
//----------------------------------------------------------------
// initialize maxmod without any soundbank (unusual setup)
//----------------------------------------------------------------
sys.mod_count = 0;
sys.samp_count = 0;
sys.mem_bank = 0;
sys.fifo_channel = FIFO_MAXMOD;
mmInit( &sys );
// setup mixer stack
for (int i=0; i<maxPoly; i++) {
mixerStack[i].active = -1;
}
numPlaying = 0;
stream.sampling_rate = outputSampleRate; // outputSampleRate
stream.buffer_length = streamBufferLen; // should be adequate
stream.callback = fill_stream; // give fill routine
stream.format = MM_STREAM_16BIT_MONO; // 16-bit mono
stream.timer = MM_TIMER0; // use timer0
stream.manual = 0; // auto filling
mmStreamOpen( &stream );
return 0;
}
/**********************************************************************************
* main
*
* Program Entry Point
**********************************************************************************/
int main( void ) {
//---------------------------------------------------------------------------------
//----------------------------------------------------------------
// print out some stuff
//----------------------------------------------------------------
consoleDemoInit();
iprintf( "\n Maxmod Streaming Example \n");
//----------------------------------------------------------------
// initialize maxmod without any soundbank (unusual setup)
//----------------------------------------------------------------
mm_ds_system sys;
sys.mod_count = 0;
sys.samp_count = 0;
sys.mem_bank = 0;
sys.fifo_channel = FIFO_MAXMOD;
mmInit( &sys );
//----------------------------------------------------------------
// open stream
//----------------------------------------------------------------
mm_stream mystream;
mystream.sampling_rate = 25000; // sampling rate = 25khz
mystream.buffer_length = 1200; // buffer length = 1200 samples
mystream.callback = on_stream_request; // set callback function
mystream.format = MM_STREAM_16BIT_STEREO; // format = stereo 16-bit
mystream.timer = MM_TIMER0; // use hardware timer 0
mystream.manual = true; // use manual filling
mmStreamOpen( &mystream );
//----------------------------------------------------------------
// when using 'automatic' filling, your callback will be triggered
// every time half of the wave buffer is processed.
//
// so:
// 25000 (rate)
// ----- = ~21 Hz for a full pass, and ~42hz for half pass
// 1200 (length)
//----------------------------------------------------------------
// with 'manual' filling, you must call mmStreamUpdate
// periodically (and often enough to avoid buffer underruns)
//----------------------------------------------------------------
SetYtrigger( 0 );
irqEnable( IRQ_VCOUNT );
while( 1 )
{
// wait until line 0
swiIntrWait( 0, IRQ_VCOUNT);
// update stream
mmStreamUpdate();
// restore backdrop (some lines were drawn with another colour to show cpu usage)
BG_PALETTE_SUB[0] = bg_colour;
// wait until next frame
swiWaitForVBlank();
// set backdrop to show cpu usage
BG_PALETTE_SUB[0] = cpu_colour;
}
return 0;
}
