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In 'Shaped' dither, do the best we can with a NaN.

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Reset the filter every time to prevent one conversion affecting the next.
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martynshaw99
2012-02-10 00:12:59 +00:00
parent 7cb5c6e763
commit 61410ebd79
1 changed files with 3 additions and 0 deletions
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3
src/Dither.cpp
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@@ -248,6 +248,7 @@ void Dither::Apply(enum DitherType ditherType,
DITHER(TriangleDither, dest, destFormat, source, sourceFormat, len, stride); DITHER(TriangleDither, dest, destFormat, source, sourceFormat, len, stride);
break; break;
case shaped: case shaped:
Reset(); // reset shaped dither filter for this new conversion
DITHER(ShapedDither, dest, destFormat, source, sourceFormat, len, stride); DITHER(ShapedDither, dest, destFormat, source, sourceFormat, len, stride);
break; break;
default: default:
@@ -285,6 +286,8 @@ inline float Dither::ShapedDither(float sample)
{ {
// Generate triangular dither, +-1 LSB, flat psd // Generate triangular dither, +-1 LSB, flat psd
float r = DITHER_NOISE + DITHER_NOISE; float r = DITHER_NOISE + DITHER_NOISE;
if(sample != sample) // test for NaN
sample = 0; // and do the best we can with it
// Run FIR // Run FIR
float xe = sample + mBuffer[mPhase] * SHAPED_BS[0] float xe = sample + mBuffer[mPhase] * SHAPED_BS[0]