// functions
unsafe void GenerateSlowChannel(ref FracTime playPos, int sampleCount44k, float *finalBuffer)
{
int i, zeroedPos, count = 0;
var sw = (SoundWorldLocal)soundSystemLocal.PlayingSoundWorld;
var in_ = stackalloc float[Simd.MIXBUFFER_SAMPLES + 3]; var src = in_ + 2;
var out_ = stackalloc float[Simd.MIXBUFFER_SAMPLES + 3]; var spline = out_ + 2;
var slowmoSpeed = sw != null ? sw.slowmoSpeed : 1f;
var neededSamples = (int)(sampleCount44k * slowmoSpeed + 4);
// get the channel's samples
chan.GatherChannelSamples(playPos.time * 2, neededSamples, src);
for (i = 0; i < neededSamples >> 1; i++)
{
spline[i] = src[i * 2];
}
// interpolate channel
zeroedPos = playPos.time;
playPos.time = 0;
for (i = 0; i < sampleCount44k >> 1; i++, count += 2)
{
var val = spline[playPos.time];
src[i] = val;
playPos.Increment(slowmoSpeed);
}
// lowpass filter
var in_p = in_ + 2; var out_p = out_ + 2;
var numSamples = sampleCount44k >> 1;
lowpass.GetContinuitySamples(out in_p[-1], out in_p[-2], out out_p[-1], out out_p[-2]);
lowpass.SetParms(slowmoSpeed * 15000, 1.2f);
for (i = 0, count = 0; i < numSamples; i++, count += 2)
{
lowpass.ProcessSample(in_p + i, out_p + i);
finalBuffer[count] = finalBuffer[count + 1] = out_[i];
}
lowpass.SetContinuitySamples(in_p[numSamples - 2], in_p[numSamples - 3], out_p[numSamples - 2], out_p[numSamples - 3]);
playPos.time += zeroedPos;
}
public unsafe void GatherChannelSamples(int sampleOffset44k, int sampleCount44k, float *dest)
{
PLAYBACK state = 0;
// setup chan
active = true;
newSampleOffset = sampleOffset44k >> 1;
// set state
if (newSampleOffset < curSampleOffset)
{
state = PLAYBACK.RESET;
}
else if (newSampleOffset > curSampleOffset)
{
state = PLAYBACK.ADVANCING;
}
if (state == PLAYBACK.RESET)
{
curPosition.Set(newSampleOffset);
}
// set current vars
curSampleOffset = newSampleOffset;
newPosition = curPosition;
// do the slow processing
GenerateSlowChannel(ref newPosition, sampleCount44k, dest);
// finish off
if (state == PLAYBACK.ADVANCING)
{
curPosition = newPosition;
}
}