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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONVOLVER_HANDLER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONVOLVER_HANDLER_H_
#include <memory>
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_refptr.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
namespace blink {
class AudioBuffer;
class ConvolverOptions;
class ExceptionState;
class Reverb;
class SharedAudioBuffer;
class MODULES_EXPORT ConvolverHandler final : public AudioHandler {
public:
static scoped_refptr<ConvolverHandler> Create(AudioNode&, float sample_rate);
~ConvolverHandler() override;
// AudioHandler
void Process(uint32_t frames_to_process) override;
// Called in the main thread when the number of channels for the input may
// have changed.
void CheckNumberOfChannelsForInput(AudioNodeInput*) override;
// Impulse responses
void SetBuffer(AudioBuffer*, ExceptionState&);
bool Normalize() const { return normalize_; }
void SetNormalize(bool normalize) { normalize_ = normalize; }
void SetChannelCount(unsigned, ExceptionState&) final;
void SetChannelCountMode(V8ChannelCountMode::Enum, ExceptionState&) final;
private:
ConvolverHandler(AudioNode&, float sample_rate);
double TailTime() const override;
double LatencyTime() const override;
bool RequiresTailProcessing() const final;
// Determine how many output channels to use from the number of
// input channels and the number of channels in the impulse response
// buffer.
unsigned ComputeNumberOfOutputChannels(unsigned input_channels,
unsigned response_channels) const;
std::unique_ptr<Reverb> reverb_ GUARDED_BY(process_lock_);
std::unique_ptr<SharedAudioBuffer> shared_buffer_ GUARDED_BY(process_lock_);
// This synchronizes dynamic changes to the convolution impulse response with
// process().
mutable base::Lock process_lock_;
// Normalize the impulse response or not. Must default to true.
bool normalize_ = true;
FRIEND_TEST_ALL_PREFIXES(ConvolverNodeTest, ReverbLifetime);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONVOLVER_HANDLER_H_
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