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APM PFFFT wrapper: Add frequency domain convolution

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Wrapping pffft_zconvolve_accumulate()

Bug: webrtc:9577
Change-Id: I68b7da4d08c28583f5abd59d906603754c94c00f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130500
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27358}
This commit is contained in:
Alessio Bazzica 2019-03-29 13:02:40 +01:00 committed by Commit Bot
parent 21583fdbcf
commit 703e34a04f
2 changed files with 20 additions and 0 deletions
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11
modules/audio_processing/utility/pffft_wrapper.cc
View file

@ -121,4 +121,15 @@ void Pffft::BackwardTransform(const FloatBuffer& in,
}
}
void Pffft::FrequencyDomainConvolve(const FloatBuffer& fft_x,
const FloatBuffer& fft_y,
FloatBuffer* out,
float scaling) {
RTC_DCHECK_EQ(fft_x.size(), GetBufferSize(fft_size_, fft_type_));
RTC_DCHECK_EQ(fft_x.size(), fft_y.size());
RTC_DCHECK_EQ(fft_x.size(), out->size());
pffft_zconvolve_accumulate(pffft_status_, fft_x.const_data(),
fft_y.const_data(), out->data(), scaling);
}
} // namespace webrtc

9
modules/audio_processing/utility/pffft_wrapper.h
View file

@ -73,6 +73,15 @@ class Pffft {
// Computes the backward fast Fourier transform.
void BackwardTransform(const FloatBuffer& in, FloatBuffer* out, bool ordered);
// Multiplies the frequency components of |fft_x| and |fft_y| and accumulates
// them into |out|. The arrays must have been obtained with
// ForwardTransform(..., /*ordered=*/false) - i.e., |fft_x| and |fft_y| must
// not be ordered.
void FrequencyDomainConvolve(const FloatBuffer& fft_x,
const FloatBuffer& fft_y,
FloatBuffer* out,
float scaling = 1.f);
private:
const size_t fft_size_;
const FftType fft_type_;