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 ga_stream_produce(ga_BufferedStream* in_stream)
{
ga_BufferedStream* s = in_stream;
gc_CircBuffer* b = s->buffer;
gc_int32 sampleSize = ga_format_sampleSize(&s->format);
gc_int32 bytesFree = gc_buffer_bytesFree(b);
if(s->seek >= 0)
{
gc_int32 samplePos;
gc_mutex_lock(s->readMutex);
gc_mutex_lock(s->seekMutex);
if(s->seek >= 0) /* Check again now that we're mutexed */
{
samplePos = s->seek;
s->tell = samplePos;
s->seek = -1;
s->nextSample = samplePos;
ga_sample_source_seek(s->innerSrc, samplePos);
gc_buffer_consume(s->buffer, gc_buffer_bytesAvail(s->buffer)); /* Clear buffer */
gauX_tell_jump_clear(&s->tellJumps); /* Clear tell-jump list */
}
gc_mutex_unlock(s->seekMutex);
gc_mutex_unlock(s->readMutex);
}
while(bytesFree)
{
gc_int32 samplesWritten = 0;
gc_int32 bytesWritten = 0;
gc_int32 bytesToWrite = bytesFree;
samplesWritten = gaX_read_samples_into_stream(s, b, bytesToWrite / sampleSize, s->innerSrc);
bytesWritten = samplesWritten * sampleSize;
bytesFree -= bytesWritten;
s->nextSample += samplesWritten;
if(bytesWritten < bytesToWrite && ga_sample_source_end(s->innerSrc))
{
s->end = 1;
break;
}
}
}
gc_int32 gauX_sample_source_loop_seek(void* in_context, gc_int32 in_sampleOffset)
{
gau_SampleSourceLoopContext* ctx = &((gau_SampleSourceLoop*)in_context)->context;
return ga_sample_source_seek(ctx->innerSrc, in_sampleOffset);
}
gc_result ga_handle_seek(ga_Handle* in_handle, gc_int32 in_sampleOffset)
{
ga_sample_source_seek(in_handle->sampleSrc, in_sampleOffset);
return GC_SUCCESS;
}