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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_AUDIO_WORKLET_HANDLER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_AUDIO_WORKLET_HANDLER_H_
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_audio_worklet_node_options.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/modules/webaudio/audio_param_map.h"
#include "third_party/blink/renderer/modules/webaudio/audio_worklet_processor_error_state.h"
#include "third_party/blink/renderer/platform/heap/cross_thread_persistent.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
namespace blink {
class AudioNodeInput;
class AudioWorkletProcessor;
class BaseAudioContext;
class CrossThreadAudioParamInfo;
class ExceptionState;
class MessagePort;
class ScriptState;
class AudioWorkletHandler final : public AudioHandler {
public:
static scoped_refptr<AudioWorkletHandler> Create(
AudioNode&,
float sample_rate,
String name,
HashMap<String, scoped_refptr<AudioParamHandler>> param_handler_map,
const AudioWorkletNodeOptions*);
~AudioWorkletHandler() override;
// Called from render thread.
void Process(uint32_t frames_to_process) override;
void CheckNumberOfChannelsForInput(AudioNodeInput*) override;
void UpdatePullStatusIfNeeded() override;
double TailTime() const override;
double LatencyTime() const override { return 0; }
String Name() const { return name_; }
// Sets `AudioWorkletProcessor` and changes the state of the processor.
// MUST be called from the render thread.
void SetProcessorOnRenderThread(AudioWorkletProcessor*);
// Finish `AudioWorkletProcessor` and set the tail time to zero, when
// the user-supplied `process()` method returns false.
void FinishProcessorOnRenderThread();
void NotifyProcessorError(AudioWorkletProcessorErrorState);
void MarkProcessorInactiveOnMainThread();
bool IsProcessorActive() { return is_processor_active_; }
private:
AudioWorkletHandler(
AudioNode&,
float sample_rate,
String name,
HashMap<String, scoped_refptr<AudioParamHandler>> param_handler_map,
const AudioWorkletNodeOptions*);
// Used to avoid code duplication when using scoped objects that affect
// `Process`.
void ProcessInternal(uint32_t frames_to_process);
String name_;
double tail_time_ = std::numeric_limits<double>::infinity();
// MUST be set/used by render thread.
CrossThreadPersistent<AudioWorkletProcessor> processor_;
// Keeps the reference of AudioBus objects from AudioNodeInput and
// AudioNodeOutput in order to pass them to AudioWorkletProcessor.
Vector<scoped_refptr<AudioBus>> inputs_;
Vector<scoped_refptr<AudioBus>> outputs_;
// For unconnected outputs, the handler needs to provide an AudioBus object
// to the AudioWorkletProcessor.
Vector<scoped_refptr<AudioBus>> unconnected_outputs_;
HashMap<String, scoped_refptr<AudioParamHandler>> param_handler_map_;
HashMap<String, std::unique_ptr<AudioFloatArray>> param_value_map_;
// TODO(crbug.com/1447088): The tail time of AudioWorkletNode is decided by
// the active processing flag. So it doesn't need an automatic tail time
// management from the renderer.
bool RequiresTailProcessing() const override { return true; }
scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
// Used only if number of inputs and outputs are 1.
bool is_output_channel_count_given_ = false;
// The active flag of the AudioWorkletProcessor is used to decide the
// lifecycle of an AudioWorkletNode and its handler. This flag becomes false
// when a processor stops invoking the user-defined `process()` callback.
bool is_processor_active_ = true;
// Cached feature flag value
const bool allow_denormal_in_processing_;
base::WeakPtrFactory<AudioWorkletHandler> weak_ptr_factory_{this};
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_AUDIO_WORKLET_HANDLER_H_
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