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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
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* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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* 2. Redistributions in binary form must reproduce the above copyright
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* 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
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_H_
#include <memory>
#include "base/macros.h"
#include "third_party/blink/renderer/platform/audio/reverb_convolver.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class AudioBus;
// Multi-channel convolution reverb with channel matrixing - one or more
// ReverbConvolver objects are used internally.
class PLATFORM_EXPORT Reverb {
USING_FAST_MALLOC(Reverb);
public:
enum { kMaxFrameSize = 256 };
// renderSliceSize is a rendering hint, so the FFTs can be optimized to not
// all occur at the same time (very bad when rendering on a real-time thread).
Reverb(AudioBus* impulse_response_buffer,
size_t render_slice_size,
size_t max_fft_size,
bool use_background_threads,
bool normalize);
void Process(const AudioBus* source_bus,
AudioBus* destination_bus,
uint32_t frames_to_process);
void Reset();
size_t ImpulseResponseLength() const { return impulse_response_length_; }
size_t LatencyFrames() const;
private:
void Initialize(AudioBus* impulse_response_buffer,
size_t render_slice_size,
size_t max_fft_size,
bool use_background_threads);
size_t impulse_response_length_;
// The actual number of channels in the response. This can be less
// than the number of ReverbConvolver's in |m_convolvers|.
unsigned number_of_response_channels_;
Vector<std::unique_ptr<ReverbConvolver>> convolvers_;
// For "True" stereo processing
scoped_refptr<AudioBus> temp_buffer_;
DISALLOW_COPY_AND_ASSIGN(Reverb);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_H_