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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_STAGE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_STAGE_H_
#include <memory>
#include "third_party/blink/renderer/platform/audio/audio_array.h"
#include "third_party/blink/renderer/platform/audio/fft_frame.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
namespace blink {
class ReverbAccumulationBuffer;
class ReverbConvolver;
class FFTConvolver;
class DirectConvolver;
// A ReverbConvolverStage represents the convolution associated with a
// sub-section of a large impulse response. It incorporates a delay line to
// account for the offset of the sub-section within the larger impulse
// response.
class PLATFORM_EXPORT ReverbConvolverStage {
USING_FAST_MALLOC(ReverbConvolverStage);
WTF_MAKE_NONCOPYABLE(ReverbConvolverStage);
public:
// renderPhase is useful to know so that we can manipulate the pre versus post
// delay so that stages will perform their heavy work (FFT processing) on
// different slices to balance the load in a real-time thread.
ReverbConvolverStage(const float* impulse_response,
size_t response_length,
size_t reverb_total_latency,
size_t stage_offset,
size_t stage_length,
size_t fft_size,
size_t render_phase,
size_t render_slice_size,
ReverbAccumulationBuffer*,
bool direct_mode = false);
// WARNING: framesToProcess must be such that it evenly divides the delay
// buffer size (stage_offset).
void Process(const float* source, uint32_t frames_to_process);
void ProcessInBackground(ReverbConvolver* convolver,
uint32_t frames_to_process);
void Reset();
// Useful for background processing
int InputReadIndex() const { return input_read_index_; }
private:
std::unique_ptr<FFTFrame> fft_kernel_;
std::unique_ptr<FFTConvolver> fft_convolver_;
AudioFloatArray pre_delay_buffer_;
ReverbAccumulationBuffer* accumulation_buffer_;
int accumulation_read_index_;
int input_read_index_;
size_t pre_delay_length_;
size_t post_delay_length_;
size_t pre_read_write_index_;
size_t frames_processed_;
AudioFloatArray temporary_buffer_;
bool direct_mode_;
std::unique_ptr<DirectConvolver> direct_convolver_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_STAGE_H_
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