569285794b
For the git migration we want a nice clean repository with UNIX line endings. git does not use svn:eol-style, we just need the file contents to be sane. Sorry everybody. I know this messes up blame. Scumbag *NIX developer says migrating to git will make line ending issues go away; commits giant change to svn which changes line endings anyway. :) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30924 a1c6a512-1295-4272-9138-f99709370657
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
#include "sms_fm_apu.h"
|
|
|
|
#include "blargg_source.h"
|
|
|
|
void Fm_apu_create( struct Sms_Fm_Apu* this )
|
|
{
|
|
Synth_init( &this->synth );
|
|
Ym2413_init( &this->apu );
|
|
}
|
|
|
|
blargg_err_t Fm_apu_init( struct Sms_Fm_Apu* this, int clock_rate, int sample_rate )
|
|
{
|
|
this->period_ = (blip_time_t) (clock_rate / sample_rate);
|
|
CHECK_ALLOC( !Ym2413_set_rate( &this->apu, sample_rate, clock_rate ) );
|
|
|
|
Fm_apu_set_output( this, 0 );
|
|
Fm_apu_volume( this, (int)FP_ONE_VOLUME );
|
|
Fm_apu_reset( this );
|
|
return 0;
|
|
}
|
|
|
|
void Fm_apu_reset( struct Sms_Fm_Apu* this )
|
|
{
|
|
this->addr = 0;
|
|
this->next_time = 0;
|
|
this->last_amp = 0;
|
|
|
|
Ym2413_reset( &this->apu );
|
|
}
|
|
|
|
void fm_run_until( struct Sms_Fm_Apu* this, blip_time_t end_time );
|
|
void Fm_apu_write_data( struct Sms_Fm_Apu* this, blip_time_t time, int data )
|
|
{
|
|
if ( time > this->next_time )
|
|
fm_run_until( this, time );
|
|
|
|
Ym2413_write( &this->apu, this->addr, data );
|
|
}
|
|
|
|
void fm_run_until( struct Sms_Fm_Apu* this, blip_time_t end_time )
|
|
{
|
|
assert( end_time > this->next_time );
|
|
|
|
struct Blip_Buffer* const output = this->output_;
|
|
if ( !output )
|
|
{
|
|
this->next_time = end_time;
|
|
return;
|
|
}
|
|
|
|
blip_time_t time = this->next_time;
|
|
struct Ym2413_Emu* emu = &this->apu;
|
|
do
|
|
{
|
|
short samples [2];
|
|
Ym2413_run( emu, 1, samples );
|
|
int amp = (samples [0] + samples [1]) >> 1;
|
|
|
|
int delta = amp - this->last_amp;
|
|
if ( delta )
|
|
{
|
|
this->last_amp = amp;
|
|
Synth_offset_inline( &this->synth, time, delta, output );
|
|
}
|
|
time += this->period_;
|
|
}
|
|
while ( time < end_time );
|
|
|
|
this->next_time = time;
|
|
}
|
|
|
|
void Fm_apu_end_frame( struct Sms_Fm_Apu* this, blip_time_t time )
|
|
{
|
|
if ( time > this->next_time )
|
|
fm_run_until( this, time );
|
|
|
|
this->next_time -= time;
|
|
assert( this->next_time >= 0 );
|
|
|
|
if ( this->output_ )
|
|
Blip_set_modified( this->output_ );
|
|
}
|