void GBAudioReset(struct GBAudio* audio) {
audio->nextEvent = 0;
audio->nextCh1 = 0;
audio->nextCh2 = 0;
audio->nextCh3 = 0;
audio->fadeCh3 = 0;
audio->nextCh4 = 0;
audio->ch1 = (struct GBAudioChannel1) { .envelope = { .dead = 2 } };
audio->ch2 = (struct GBAudioChannel2) { .envelope = { .dead = 2 } };
audio->ch3 = (struct GBAudioChannel3) { .bank = 0 };
audio->ch4 = (struct GBAudioChannel4) { .envelope = { .dead = 2 } };
audio->eventDiff = 0;
audio->nextFrame = 0;
audio->frame = 0;
audio->nextSample = 0;
audio->sampleInterval = 128;
audio->lastLeft = 0;
audio->lastRight = 0;
audio->clock = 0;
audio->volumeRight = 0;
audio->volumeLeft = 0;
audio->ch1Right = false;
audio->ch2Right = false;
audio->ch3Right = false;
audio->ch4Right = false;
audio->ch1Left = false;
audio->ch2Left = false;
audio->ch3Left = false;
audio->ch4Left = false;
audio->playingCh1 = false;
audio->playingCh2 = false;
audio->playingCh3 = false;
audio->playingCh4 = false;
}
void GBAudioResizeBuffer(struct GBAudio* audio, size_t samples) {
mCoreSyncLockAudio(audio->p->sync);
audio->samples = samples;
blip_clear(audio->left);
blip_clear(audio->right);
audio->clock = 0;
mCoreSyncConsumeAudio(audio->p->sync);
}
static void _mSDLAudioCallback(void* context, Uint8* data, int len) {
struct mSDLAudio* audioContext = context;
if (!context || !audioContext->core) {
memset(data, 0, len);
return;
}
blip_t* left = NULL;
blip_t* right = NULL;
int32_t clockRate = GBA_ARM7TDMI_FREQUENCY;
if (audioContext->core) {
left = audioContext->core->getAudioChannel(audioContext->core, 0);
right = audioContext->core->getAudioChannel(audioContext->core, 1);
clockRate = audioContext->core->frequency(audioContext->core);
}
double fauxClock = 1;
if (audioContext->sync) {
if (audioContext->sync->fpsTarget > 0) {
fauxClock = GBAAudioCalculateRatio(1, audioContext->sync->fpsTarget, 1);
}
mCoreSyncLockAudio(audioContext->sync);
}
blip_set_rates(left, clockRate, audioContext->obtainedSpec.freq * fauxClock);
blip_set_rates(right, clockRate, audioContext->obtainedSpec.freq * fauxClock);
len /= 2 * audioContext->obtainedSpec.channels;
int available = blip_samples_avail(left);
if (available > len) {
available = len;
}
blip_read_samples(left, (short*) data, available, audioContext->obtainedSpec.channels == 2);
if (audioContext->obtainedSpec.channels == 2) {
blip_read_samples(right, ((short*) data) + 1, available, 1);
}
if (audioContext->sync) {
mCoreSyncConsumeAudio(audioContext->sync);
}
if (available < len) {
memset(((short*) data) + audioContext->obtainedSpec.channels * available, 0, (len - available) * audioContext->obtainedSpec.channels * sizeof(short));
}
}
