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#include "audio/nebu_SoundSystem.h"
#include <string.h>
namespace Sound {
System::System(SDL_AudioSpec *spec) {
_spec = spec;
_sources.next = NULL;
_info.format = _spec->format;
_info.rate = spec->freq;
_info.channels = spec->channels;
_mix_music = 1; // TODO: add 'master' volume for music and fx
_mix_fx = 1;
_status = 0; // sound system is not initialized
}
void System::Callback(Uint8* data, int len) {
// printf("callback got called for %d bytes of data\n", len);
// ensure silence
memset(data, 0, len);
if(_status == eUninitialized)
return;
List* p;
int sources_mixed = 0;
for(p = & _sources; p->next != NULL; p = p->next) {
Source* s = (Source*) p->data;
if(s->IsPlaying()) {
// fprintf(stderr, "mixing source\n");
if(!(
(s->GetType() & eSoundFX && ! _mix_fx ) ||
(s->GetType() & eSoundMusic && ! _mix_music) )
)
{
if( s->Mix(data, len) )
sources_mixed++;
}
// fprintf(stderr, "done mixing %d sources\n", sources_mixed);
}
}
}
void System::AddSource(Source* source) {
List* p;
for(p = & _sources; p->next != NULL; p = p->next);
p->next = new List;
p->next->next = NULL;
p->data = source;
}
void System::Idle(void) {
/* idle processing */
List *p;
for(p = & _sources; p->next != NULL; p = p->next) {
Source *source = (Source*) p->data;
// check if source is removable & has stopped playing
if(source->IsRemovable() && !source->IsPlaying()) {
// get rid of data
p->data = p->next->data;
List *tmp = p->next;
p->next = p->next->next;
delete tmp;
delete source;
if(p->next == NULL)
break;
} else {
source->Idle();
}
}
}
extern "C" {
void c_callback(void *userdata, Uint8 *stream, int len) {
// printf("c_callback got called for %d bytes of data\n", len);
((System*)userdata)->Callback(stream, len);
}
}
}
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