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Mixer/Spatializer: Fade delay into non-interpolating mode when source is stationary.

This commit is contained in:
Jonathan Moore Liles 2013-07-20 16:29:09 -07:00
parent 2da6c503aa
commit 50d5411411
1 changed files with 50 additions and 13 deletions
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41
mixer/src/Spatializer_Module.C
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@ -129,8 +129,12 @@ class delay
long _write_index;
unsigned int _buffer_mask;
float _max_delay;
nframes_t _samples_since_motion;
nframes_t _interpolation_delay_samples;
float _interpolation_delay_coeff;
public:
void sample_rate ( float srate )
{
if ( _buffer )
@ -150,11 +154,17 @@ public:
_sample_rate = srate;
_write_index = 0;
_interpolation_delay_samples = 0.2f * srate;
_interpolation_delay_coeff = 1.0f / (float)_interpolation_delay_samples;
}
delay ( float max_delay )
{
_interpolation_delay_samples = 0;
_interpolation_delay_coeff = 0;
_samples_since_motion = 0;
_max_delay = max_delay;
_write_index = 0;
_sample_rate = 0;
@ -198,6 +208,8 @@ public:
buf[i] = read;
}
_samples_since_motion = 0;
}
else
{
@ -209,7 +221,28 @@ public:
delay_samples = min_delay_samples;
long idelay_samples = (long)delay_samples;
const float frac = delay_samples - idelay_samples;
if ( _samples_since_motion >= _interpolation_delay_samples )
{
/* switch to non-interpolating mode */
for (nframes_t i = 0; i < nframes; i++ )
{
const long read_index = _write_index - idelay_samples;
_buffer[_write_index++ & _buffer_mask] = buf[i];
const float read = _buffer[read_index & _buffer_mask];
buf[i] = read;
}
}
else
{
/* linearly interpolate our way to an integer sample delay */
float frac = delay_samples - idelay_samples;
const float scale = 1.0f - (_samples_since_motion * _interpolation_delay_coeff);
for (nframes_t i = 0; i < nframes; i++ )
{
@ -217,6 +250,8 @@ public:
_buffer[_write_index++ & _buffer_mask] = buf[i];
frac *= scale;
const float read = interpolate_cubic (frac,
_buffer[(read_index-1) & _buffer_mask],
_buffer[read_index & _buffer_mask],
@ -225,8 +260,10 @@ public:
buf[i] = read;
}
}
_samples_since_motion += nframes;
}
}
}
};