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author | Chris Johnson <jinx6568@sover.net> | 2019-01-27 21:13:54 -0500 |
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committer | Chris Johnson <jinx6568@sover.net> | 2019-01-27 21:13:54 -0500 |
commit | 966f2d253cd2ee6ce140ad68095a20a9d2b63052 (patch) | |
tree | b0400d95bd06512531ade6ddf55190a58b6a5623 /plugins/MacAU/MidSide/MidSide.cpp | |
parent | 0887543349dbbec0721a1fc8b1c7deba9afefa8b (diff) | |
download | airwindows-lv2-port-966f2d253cd2ee6ce140ad68095a20a9d2b63052.tar.gz airwindows-lv2-port-966f2d253cd2ee6ce140ad68095a20a9d2b63052.tar.bz2 airwindows-lv2-port-966f2d253cd2ee6ce140ad68095a20a9d2b63052.zip |
Floating Point Dither For All
Diffstat (limited to 'plugins/MacAU/MidSide/MidSide.cpp')
-rwxr-xr-x | plugins/MacAU/MidSide/MidSide.cpp | 40 |
1 files changed, 11 insertions, 29 deletions
diff --git a/plugins/MacAU/MidSide/MidSide.cpp b/plugins/MacAU/MidSide/MidSide.cpp index 32dfa00..8330aa1 100755 --- a/plugins/MacAU/MidSide/MidSide.cpp +++ b/plugins/MacAU/MidSide/MidSide.cpp @@ -171,11 +171,8 @@ ComponentResult MidSide::Initialize() // this is called the reset the DSP state (clear buffers, reset counters, etc.) ComponentResult MidSide::Reset(AudioUnitScope inScope, AudioUnitElement inElement) { - fpNShapeLA = 0.0; - fpNShapeLB = 0.0; - fpNShapeRA = 0.0; - fpNShapeRB = 0.0; - fpFlip = true; + fpNShapeL = 0.0; + fpNShapeR = 0.0; return noErr; } @@ -194,11 +191,7 @@ OSStatus MidSide::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData); Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData); UInt32 nSampleFrames = inFramesToProcess; - - Float32 fpTemp; - long double fpOld = 0.618033988749894848204586; //golden ratio! - long double fpNew = 1.0 - fpOld; - + long double inputSampleL; long double inputSampleR; long double mid; @@ -256,25 +249,14 @@ OSStatus MidSide::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags mid *= midgain; side *= sidegain; - //noise shaping to 32-bit floating point - if (fpFlip) { - fpTemp = mid; - fpNShapeLA = (fpNShapeLA*fpOld)+((mid-fpTemp)*fpNew); - mid += fpNShapeLA; - fpTemp = side; - fpNShapeRA = (fpNShapeRA*fpOld)+((side-fpTemp)*fpNew); - side += fpNShapeRA; - } - else { - fpTemp = mid; - fpNShapeLB = (fpNShapeLB*fpOld)+((mid-fpTemp)*fpNew); - mid += fpNShapeLB; - fpTemp = side; - fpNShapeRB = (fpNShapeRB*fpOld)+((side-fpTemp)*fpNew); - side += fpNShapeRB; - } - fpFlip = !fpFlip; - //end noise shaping on 32 bit output + //stereo 32 bit dither, made small and tidy. + int expon; frexpf((Float32)mid, &expon); + long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62); + mid += (dither-fpNShapeL); fpNShapeL = dither; + frexpf((Float32)side, &expon); + dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62); + side += (dither-fpNShapeR); fpNShapeR = dither; + //end 32 bit dither *outputL = mid; *outputR = side; |