void Audio::MixOutput(void* dest, unsigned samples)
{
if (!playing_ || !clipBuffer_)
{
memset(dest, 0, samples * sampleSize_ * SAMPLE_SIZE_MUL);
return;
}
while (samples)
{
// If sample count exceeds the fragment (clip buffer) size, split the work
unsigned workSamples = Min(samples, fragmentSize_);
unsigned clipSamples = workSamples;
if (stereo_)
clipSamples <<= 1;
// Clear clip buffer
int* clipPtr = clipBuffer_.Get();
memset(clipPtr, 0, clipSamples * sizeof(int));
// Mix samples to clip buffer
for (PODVector<SoundSource*>::Iterator i = soundSources_.Begin(); i != soundSources_.End(); ++i)
{
SoundSource* source = *i;
// Check for pause if necessary
if (!pausedSoundTypes_.Empty())
{
if (pausedSoundTypes_.Contains(source->GetSoundType()))
continue;
}
source->Mix(clipPtr, workSamples, mixRate_, stereo_, interpolation_);
}
// Copy output from clip buffer to destination
#ifdef __EMSCRIPTEN__
float* destPtr = (float*)dest;
while (clipSamples--)
*destPtr++ = (float)Clamp(*clipPtr++, -32768, 32767) / 32768.0f;
#else
short* destPtr = (short*)dest;
while (clipSamples--)
*destPtr++ = (short)Clamp(*clipPtr++, -32768, 32767);
#endif
samples -= workSamples;
((unsigned char*&)dest) += sampleSize_ * SAMPLE_SIZE_MUL * workSamples;
}
}
void Audio::UpdateInternal(float timeStep)
{
URHO3D_PROFILE(UpdateAudio);
// Update in reverse order, because sound sources might remove themselves
for (unsigned i = soundSources_.Size() - 1; i < soundSources_.Size(); --i)
{
SoundSource* source = soundSources_[i];
// Check for pause if necessary; do not update paused sound sources
if (!pausedSoundTypes_.Empty())
{
if (pausedSoundTypes_.Contains(source->GetSoundType()))
continue;
}
source->Update(timeStep);
}
}