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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h')
-rw-r--r-- | third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h b/third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h new file mode 100644 index 0000000000..983c2fd1bc --- /dev/null +++ b/third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper.h @@ -0,0 +1,94 @@ +/* + * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef MODULES_AUDIO_PROCESSING_UTILITY_PFFFT_WRAPPER_H_ +#define MODULES_AUDIO_PROCESSING_UTILITY_PFFFT_WRAPPER_H_ + +#include <memory> + +#include "api/array_view.h" + +// Forward declaration. +struct PFFFT_Setup; + +namespace webrtc { + +// Pretty-Fast Fast Fourier Transform (PFFFT) wrapper class. +// Not thread safe. +class Pffft { + public: + enum class FftType { kReal, kComplex }; + + // 1D floating point buffer used as input/output data type for the FFT ops. + // It must be constructed using Pffft::CreateBuffer(). + class FloatBuffer { + public: + FloatBuffer(const FloatBuffer&) = delete; + FloatBuffer& operator=(const FloatBuffer&) = delete; + ~FloatBuffer(); + + rtc::ArrayView<const float> GetConstView() const; + rtc::ArrayView<float> GetView(); + + private: + friend class Pffft; + FloatBuffer(size_t fft_size, FftType fft_type); + const float* const_data() const { return data_; } + float* data() { return data_; } + size_t size() const { return size_; } + + const size_t size_; + float* const data_; + }; + + // TODO(https://crbug.com/webrtc/9577): Consider adding a factory and making + // the ctor private. + // static std::unique_ptr<Pffft> Create(size_t fft_size, + // FftType fft_type); Ctor. `fft_size` must be a supported size (see + // Pffft::IsValidFftSize()). If not supported, the code will crash. + Pffft(size_t fft_size, FftType fft_type); + Pffft(const Pffft&) = delete; + Pffft& operator=(const Pffft&) = delete; + ~Pffft(); + + // Returns true if the FFT size is supported. + static bool IsValidFftSize(size_t fft_size, FftType fft_type); + + // Returns true if SIMD code optimizations are being used. + static bool IsSimdEnabled(); + + // Creates a buffer of the right size. + std::unique_ptr<FloatBuffer> CreateBuffer() const; + + // TODO(https://crbug.com/webrtc/9577): Overload with rtc::ArrayView args. + // Computes the forward fast Fourier transform. + void ForwardTransform(const FloatBuffer& in, FloatBuffer* out, bool ordered); + // 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_; + PFFFT_Setup* pffft_status_; + float* const scratch_buffer_; +}; + +} // namespace webrtc + +#endif // MODULES_AUDIO_PROCESSING_UTILITY_PFFFT_WRAPPER_H_ |