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Merge pull request #1439 from diizy/master

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Bitcrush: small improvement, also add some stuff to math & constants
This commit is contained in:
Vesa V
2014-12-13 11:48:56 +02:00
parent 57691c9c3f 1ad5ef22d7
commit 46d9b594e8
3 changed files with 39 additions and 10 deletions
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29
include/lmms_constants.h
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@@ -25,15 +25,28 @@
#ifndef LMMS_CONSTANTS_H
#define LMMS_CONSTANTS_H
const double D_PI = 3.14159265358979323846;
const double D_2PI = D_PI * 2.0;
const double D_PI_2 = D_PI * 0.5;
const double D_E = 2.71828182845904523536;
const long double LD_PI = 3.14159265358979323846264338327950288419716939937510;
const long double LD_2PI = LD_PI * 2.0;
const long double LD_PI_2 = LD_PI * 0.5;
const long double LD_PI_R = 1.0 / LD_PI;
const long double LD_PI_SQR = LD_PI * LD_PI;
const long double LD_E = 2.71828182845904523536028747135266249775724709369995;
const long double LD_E_R = 1.0 / LD_E;
const float F_PI = (float) D_PI;
const float F_2PI = (float) D_2PI;
const float F_PI_2 = (float) D_PI_2;
const float F_E = (float) D_E;
const double D_PI = (double) LD_PI;
const double D_2PI = (double) LD_2PI;
const double D_PI_2 = (double) LD_PI_2;
const double D_PI_R = (double) LD_PI_R;
const double D_PI_SQR = (double) LD_PI_SQR;
const double D_E = (double) LD_E;
const double D_E_R = (double) LD_E_R;
const float F_PI = (float) LD_PI;
const float F_2PI = (float) LD_2PI;
const float F_PI_2 = (float) LD_PI_2;
const float F_PI_R = (float) LD_PI_R;
const float F_PI_SQR = (float) LD_PI_SQR;
const float F_E = (float) LD_E;
const float F_E_R = (float) LD_E_R;
#endif

14
include/lmms_math.h
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@@ -289,4 +289,18 @@ static inline float fastSqrt( float n )
return u.f;
}
//! returns value furthest from zero
template<class T>
static inline T absMax( T a, T b )
{
return qAbs<T>(a) > qAbs<T>(b) ? a : b;
}
//! returns value nearest to zero
template<class T>
static inline T absMin( T a, T b )
{
return qAbs<T>(a) < qAbs<T>(b) ? a : b;
}
#endif

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;