void gaX_mixer_mix_handle(ga_Mixer* in_mixer, ga_Handle* in_handle, gc_int32 in_numSamples)
{
ga_Handle* h = in_handle;
ga_Mixer* m = in_mixer;
ga_SampleSource* ss = h->sampleSrc;
if(ga_sample_source_end(ss))
{
/* Stream is finished! */
gc_mutex_lock(h->handleMutex);
if(h->state < GA_HANDLE_STATE_FINISHED)
h->state = GA_HANDLE_STATE_FINISHED;
gc_mutex_unlock(h->handleMutex);
return;
}
else
{
if(h->state == GA_HANDLE_STATE_PLAYING)
{
ga_Format handleFormat;
ga_sample_source_format(ss, &handleFormat);
{
/* Check if we have enough samples to stream a full buffer */
gc_int32 srcSampleSize = ga_format_sampleSize(&handleFormat);
gc_int32 dstSampleSize = ga_format_sampleSize(&m->format);
gc_float32 oldPitch = h->pitch;
gc_float32 dstToSrc = handleFormat.sampleRate / (gc_float32)m->format.sampleRate * oldPitch;
gc_int32 requested = (gc_int32)(in_numSamples * dstToSrc);
requested = requested / dstToSrc < in_numSamples ? requested + 1 : requested;
if(requested > 0 && ga_sample_source_ready(ss, requested))
{
gc_float32 gain, pan, pitch;
gc_int32* dstBuffer;
gc_int32 dstSamples;
gc_mutex_lock(h->handleMutex);
gain = h->gain;
pan = h->pan;
pitch = h->pitch;
gc_mutex_unlock(h->handleMutex);
/* We avoided a mutex lock by using pitch to check if buffer has enough dst samples */
/* If it has changed since then, we re-test to make sure we still have enough samples */
if(oldPitch != pitch)
{
dstToSrc = handleFormat.sampleRate / (gc_float32)m->format.sampleRate * pitch;
requested = (gc_int32)(in_numSamples * dstToSrc);
requested = requested / dstToSrc < in_numSamples ? requested + 1 : requested;
if(!(requested > 0 && ga_sample_source_ready(ss, requested)))
return;
}
dstBuffer = &m->mixBuffer[0];
dstSamples = in_numSamples;
{
/* TODO: To optimize, we can refactor the _read() interface to be _mix(), avoiding this malloc/copy */
gc_int32 bufferSize = requested * srcSampleSize;
void* src = gcX_ops->allocFunc(bufferSize);
gc_int32 dstBytes = dstSamples * dstSampleSize;
gc_int32 numRead = 0;
numRead = ga_sample_source_read(ss, src, requested, 0, 0);
gaX_mixer_mix_buffer(in_mixer,
src, numRead, &handleFormat,
dstBuffer, dstSamples, &m->format,
gain, pan, pitch);
gcX_ops->freeFunc(src);
}
}
}
}
}
}
gc_int32 gauX_sample_source_loop_ready(void* in_context, gc_int32 in_numSamples)
{
gau_SampleSourceLoopContext* ctx = &((gau_SampleSourceLoop*)in_context)->context;
return ga_sample_source_ready(ctx->innerSrc, in_numSamples);
}
gc_int32 ga_handle_ready(ga_Handle* in_handle, gc_int32 in_numSamples)
{
return ga_sample_source_ready(in_handle->sampleSrc, in_numSamples);
}
