gc_int32 gaX_read_samples_into_stream(ga_BufferedStream* in_stream,
gc_CircBuffer* in_buffer,
gc_int32 in_samples,
ga_SampleSource* in_sampleSrc)
{
void* dataA;
void* dataB;
gc_uint32 sizeA = 0;
gc_uint32 sizeB = 0;
gc_int32 numBuffers;
gc_int32 numWritten = 0;
ga_Format fmt;
gc_int32 sampleSize;
gc_CircBuffer* b = in_buffer;
ga_sample_source_format(in_sampleSrc, &fmt);
sampleSize = ga_format_sampleSize(&fmt);
numBuffers = gc_buffer_getFree(b, in_samples * sampleSize, &dataA, &sizeA, &dataB, &sizeB);
if(numBuffers >= 1)
{
numWritten = ga_sample_source_read(in_sampleSrc, dataA, sizeA / sampleSize, &gaX_stream_onSeek, in_stream);
if(numBuffers == 2 && numWritten == sizeA)
numWritten += ga_sample_source_read(in_sampleSrc, dataB, sizeB / sampleSize, &gaX_stream_onSeek, in_stream);
}
gc_buffer_produce(b, numWritten * sampleSize);
return numWritten;
}
ga_Sound* ga_sound_create_sample_source(ga_SampleSource* in_sampleSrc)
{
ga_Sound* ret = 0;
ga_Format format;
gc_int32 dataSize;
gc_int32 totalSamples;
ga_SampleSource* sampleSrc = in_sampleSrc;
gc_int32 sampleSize;
ga_sample_source_format(sampleSrc, &format);
sampleSize = ga_format_sampleSize(&format);
ga_sample_source_tell(sampleSrc, &totalSamples);
if(totalSamples > 0)
{
/* Known total samples*/
char* data;
ga_Memory* memory;
dataSize = sampleSize * totalSamples;
data = gcX_ops->allocFunc(dataSize);
ga_sample_source_read(sampleSrc, data, totalSamples, 0, 0);
memory = gaX_memory_create(data, dataSize, 0);
if(memory)
{
ret = ga_sound_create(memory, &format);
if(!ret)
ga_memory_release(memory);
}
else
gcX_ops->freeFunc(data);
}
else
{
/* Unknown total samples */
gc_int32 BUFFER_SAMPLES = format.sampleRate * 2;
char* data = 0;
ga_Memory* memory;
totalSamples = 0;
while(!ga_sample_source_end(sampleSrc))
{
gc_int32 numSamplesRead;
data = gcX_ops->reallocFunc(data, (totalSamples + BUFFER_SAMPLES) * sampleSize);
numSamplesRead = ga_sample_source_read(sampleSrc, data + (totalSamples * sampleSize), BUFFER_SAMPLES, 0, 0);
if(numSamplesRead < BUFFER_SAMPLES)
{
data = gcX_ops->reallocFunc(data, (totalSamples + numSamplesRead) * sampleSize);
}
totalSamples += numSamplesRead;
}
memory = gaX_memory_create(data, totalSamples * sampleSize, 0);
if(memory)
{
ret = ga_sound_create(memory, &format);
if(!ret)
ga_memory_release(memory);
}
else
gcX_ops->freeFunc(data);
}
return ret;
}
gc_int32 gauX_sample_source_loop_read(void* in_context, void* in_dst, gc_int32 in_numSamples,
tOnSeekFunc in_onSeekFunc, void* in_seekContext)
{
gau_SampleSourceLoopContext* ctx = &((gau_SampleSourceLoop*)in_context)->context;
gc_int32 numRead = 0;
gc_int32 triggerSample, targetSample;
gc_int32 pos, total;
gc_int32 sampleSize;
gc_int32 totalRead = 0;
ga_SampleSource* ss = ctx->innerSrc;
gc_mutex_lock(ctx->loopMutex);
triggerSample = ctx->triggerSample;
targetSample = ctx->targetSample;
gc_mutex_unlock(ctx->loopMutex);
pos = ga_sample_source_tell(ss, &total);
if((targetSample < 0 && triggerSample <= 0))
return ga_sample_source_read(ss, in_dst, in_numSamples, 0, 0);
if(triggerSample <= 0)
triggerSample = total;
if(pos > triggerSample)
return ga_sample_source_read(ss, in_dst, in_numSamples, 0, 0);
sampleSize = ctx->sampleSize;
while(in_numSamples)
{
gc_int32 avail = triggerSample - pos;
gc_int32 doSeek = avail <= in_numSamples;
gc_int32 toRead = doSeek ? avail : in_numSamples;
numRead = ga_sample_source_read(ss, in_dst, toRead, 0, 0);
totalRead += numRead;
in_numSamples -= numRead;
in_dst = (char*)in_dst + numRead * sampleSize;
if(doSeek && toRead == numRead)
{
ga_sample_source_seek(ss, targetSample);
++ctx->loopCount;
if(in_onSeekFunc)
in_onSeekFunc(totalRead, targetSample - triggerSample, in_seekContext);
}
pos = ga_sample_source_tell(ss, &total);
}
return totalRead;
}
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);
}
}
}
}
}
}