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Add stand-alone DC blocking filter

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This commit is contained in:
Ken Cooke 2017-05-18 14:26:35 -07:00
parent c1cd26b473
commit 6f2a84a084
2 changed files with 62 additions and 0 deletions
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61
libraries/audio/src/AudioGate.cpp
View file

@ -145,6 +145,7 @@ public:
int32_t envelope(int32_t attn);
virtual void process(int16_t* input, int16_t* output, int numFrames) = 0;
virtual void removeDC(int16_t* input, int16_t* output, int numFrames) = 0;
};
GateImpl::GateImpl(int sampleRate) {
@ -412,6 +413,7 @@ public:
// mono input/output (in-place is allowed)
void process(int16_t* input, int16_t* output, int numFrames) override;
void removeDC(int16_t* input, int16_t* output, int numFrames) override;
};
template<int N>
@ -467,6 +469,21 @@ void GateMono<N>::process(int16_t* input, int16_t* output, int numFrames) {
processHistogram(numFrames);
}
template<int N>
void GateMono<N>::removeDC(int16_t* input, int16_t* output, int numFrames) {
for (int n = 0; n < numFrames; n++) {
int32_t x = input[n];
// remove DC
_dc.process(x);
// store 16-bit output
output[n] = (int16_t)saturateQ30(x);
}
}
//
// Gate (stereo)
//
@ -482,6 +499,7 @@ public:
// interleaved stereo input/output (in-place is allowed)
void process(int16_t* input, int16_t* output, int numFrames) override;
void removeDC(int16_t* input, int16_t* output, int numFrames) override;
};
template<int N>
@ -540,6 +558,23 @@ void GateStereo<N>::process(int16_t* input, int16_t* output, int numFrames) {
processHistogram(numFrames);
}
template<int N>
void GateStereo<N>::removeDC(int16_t* input, int16_t* output, int numFrames) {
for (int n = 0; n < numFrames; n++) {
int32_t x0 = input[2*n+0];
int32_t x1 = input[2*n+1];
// remove DC
_dc.process(x0, x1);
// store 16-bit output
output[2*n+0] = (int16_t)saturateQ30(x0);
output[2*n+1] = (int16_t)saturateQ30(x1);
}
}
//
// Gate (quad)
//
@ -555,6 +590,7 @@ public:
// interleaved quad input/output (in-place is allowed)
void process(int16_t* input, int16_t* output, int numFrames) override;
void removeDC(int16_t* input, int16_t* output, int numFrames) override;
};
template<int N>
@ -619,6 +655,27 @@ void GateQuad<N>::process(int16_t* input, int16_t* output, int numFrames) {
processHistogram(numFrames);
}
template<int N>
void GateQuad<N>::removeDC(int16_t* input, int16_t* output, int numFrames) {
for (int n = 0; n < numFrames; n++) {
int32_t x0 = input[4*n+0];
int32_t x1 = input[4*n+1];
int32_t x2 = input[4*n+2];
int32_t x3 = input[4*n+3];
// remove DC
_dc.process(x0, x1, x2, x3);
// store 16-bit output
output[4*n+0] = (int16_t)saturateQ30(x0);
output[4*n+1] = (int16_t)saturateQ30(x1);
output[4*n+2] = (int16_t)saturateQ30(x2);
output[4*n+3] = (int16_t)saturateQ30(x3);
}
}
//
// Public API
//
@ -677,6 +734,10 @@ void AudioGate::render(int16_t* input, int16_t* output, int numFrames) {
_impl->process(input, output, numFrames);
}
void AudioGate::removeDC(int16_t* input, int16_t* output, int numFrames) {
_impl->removeDC(input, output, numFrames);
}
void AudioGate::setThreshold(float threshold) {
_impl->setThreshold(threshold);
}

1
libraries/audio/src/AudioGate.h
View file

@ -20,6 +20,7 @@ public:
// interleaved int16_t input/output (in-place is allowed)
void render(int16_t* input, int16_t* output, int numFrames);
void removeDC(int16_t* input, int16_t* output, int numFrames);
void setThreshold(float threshold);
void setRelease(float release);