public unsafe int DecodePCM(SoundSample sample, int sampleOffset44k, int sampleCount44k, float *dest)
{
lastFormat = WAVE_FORMAT_TAG.PCM;
lastSample = sample;
var shift = 22050 / sample.objectInfo.nSamplesPerSec;
var sampleOffset = sampleOffset44k >> shift;
var sampleCount = sampleCount44k >> shift;
if (sample.nonCacheData == null)
{
Debug.Assert(false); failed = true; return(0);
} // this should never happen ( note: I've seen that happen with the main thread down in idGameLocal::MapClear clearing entities - TTimo )
if (!sample.FetchFromCache(sampleOffset * sizeof(short), out var first, out var pos, out var size, false))
{
failed = true; return(0);
}
var readSamples = size - pos < sampleCount * sizeof(short) ? (size - pos) / sizeof(short) : sampleCount;
// duplicate samples for 44kHz output
fixed(byte *_ = &first.v[first.o + pos]) Simd.UpSamplePCMTo44kHz(dest, (short *)_, readSamples, sample.objectInfo.nSamplesPerSec, sample.objectInfo.nChannels);
return(readSamples << shift);
}
public void Clear()
{
failed = false;
lastFormat = WAVE_FORMAT_TAG.PCM;
lastSample = null;
lastSampleOffset = 0;
lastDecodeTime = 0;
}
public unsafe int DecodeOGG(SoundSample sample, int sampleOffset44k, int sampleCount44k, float *dest)
{
int readSamples, totalSamples;
var shift = 22050 / sample.objectInfo.nSamplesPerSec;
var sampleOffset = sampleOffset44k >> shift;
var sampleCount = sampleCount44k >> shift;
// open OGG file if not yet opened
if (lastSample == null)
{
// make sure there is enough space for another decoder
if (ISampleDecoder.decoderMemoryAllocator.FreeBlockMemory < ISampleDecoder.MIN_OGGVORBIS_MEMORY)
{
return(0);
}
if (sample.nonCacheData == null)
{
Debug.Assert(false); failed = true; return(0);
} // this should never happen
file.SetData(sample.nonCacheData, sample.objectMemSize);
if (OggVorbis.ov_openFile(file, ogg) < 0)
{
failed = true; return(0);
}
lastFormat = WAVE_FORMAT_TAG.OGG;
lastSample = sample;
}
// seek to the right offset if necessary
if (sampleOffset != lastSampleOffset && ov_pcm_seek(ogg, sampleOffset / sample.objectInfo.nChannels) != 0)
{
failed = true; return(0);
}
lastSampleOffset = sampleOffset;
// decode OGG samples
totalSamples = sampleCount;
readSamples = 0;
do
{
float **samples;
var ret = (int)ov_read_float(ogg, &samples, totalSamples / sample.objectInfo.nChannels, null);
if (ret == 0)
{
failed = true; break;
}
if (ret < 0)
{
failed = true; return(0);
}
ret *= sample.objectInfo.nChannels;
Simd.UpSampleOGGTo44kHz(dest + (readSamples << shift), samples, ret, sample.objectInfo.nSamplesPerSec, sample.objectInfo.nChannels);
readSamples += ret;
totalSamples -= ret;
} while (totalSamples > 0);
lastSampleOffset += readSamples;
return(readSamples << shift);
}
