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Bitcrush: small improvement, also add some stuff to math & constants

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Constants:
- calculate all in long double so as to improve the accuracy of our pre-calculated constants
- add some possibly useful constants: reciprocal of pi, square of pi, and reciprocal of e
Math:
- new math convenience functions: absMax, absMin
This commit is contained in:
Vesa
2014-12-13 11:26:15 +02:00
parent 170f60c8e0
commit 1ad5ef22d7
3 changed files with 39 additions and 10 deletions
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6
plugins/Bitcrush/Bitcrush.cpp
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@@ -30,6 +30,8 @@ const int OS_RATE = 5;
const float OS_RATIO = 1.0f / OS_RATE;
const float CUTOFF_RATIO = 0.353553391f;
const int SILENCEFRAMES = 10;
const float OS_RESAMPLE [5] = { 0.0001490062883964112, 0.1645978376763992, 0.6705063120704088,
0.1645978376763992, 0.0001490062883964112 };
extern "C"
{
@@ -219,8 +221,8 @@ bool BitcrushEffect::processAudioBuffer( sampleFrame* buf, const fpp_t frames )
float rsum = 0.0f;
for( int o = 0; o < OS_RATE; ++o )
{
lsum += m_buffer[f * OS_RATE + o][0] * OS_RATIO;
rsum += m_buffer[f * OS_RATE + o][1] * OS_RATIO;
lsum += m_buffer[f * OS_RATE + o][0] * OS_RESAMPLE[o];
rsum += m_buffer[f * OS_RATE + o][1] * OS_RESAMPLE[o];
}
buf[f][0] = d * buf[f][0] + w * qBound( -m_outClip, lsum, m_outClip ) * m_outGain;
buf[f][1] = d * buf[f][1] + w * qBound( -m_outClip, rsum, m_outClip ) * m_outGain;