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/*
* Copyright (C) 2011, 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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_MODULES_WEBAUDIO_REALTIME_AUDIO_DESTINATION_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_REALTIME_AUDIO_DESTINATION_NODE_H_
#include <atomic>
#include <memory>
#include "base/memory/weak_ptr.h"
#include "third_party/blink/public/platform/web_audio_latency_hint.h"
#include "third_party/blink/renderer/modules/webaudio/audio_destination_node.h"
#include "third_party/blink/renderer/platform/audio/audio_callback_metric_reporter.h"
#include "third_party/blink/renderer/platform/audio/audio_destination.h"
#include "third_party/blink/renderer/platform/audio/audio_io_callback.h"
namespace blink {
class AudioContext;
class ExceptionState;
class WebAudioLatencyHint;
class RealtimeAudioDestinationHandler final
: public AudioDestinationHandler,
public AudioIOCallback,
public base::SupportsWeakPtr<RealtimeAudioDestinationHandler> {
public:
static scoped_refptr<RealtimeAudioDestinationHandler> Create(
AudioNode&,
const WebAudioLatencyHint&,
base::Optional<float> sample_rate);
~RealtimeAudioDestinationHandler() override;
// For AudioHandler.
void Dispose() override;
void Initialize() override;
void Uninitialize() override;
void SetChannelCount(unsigned, ExceptionState&) override;
double LatencyTime() const override { return 0; }
double TailTime() const override { return 0; }
bool RequiresTailProcessing() const final { return false; }
// For AudioDestinationHandler.
void StartRendering() override;
void StopRendering() override;
void Pause() override;
void Resume() override;
void RestartRendering() override;
uint32_t MaxChannelCount() const override;
double SampleRate() const override;
// For AudioIOCallback. This is invoked by the platform audio destination to
// get the next render quantum into |destination_bus| and update
// |output_position|.
void Render(AudioBus* destination_bus,
uint32_t number_of_frames,
const AudioIOPosition& output_position,
const AudioCallbackMetric& metric) final;
// Returns a hadrware callback buffer size from audio infra.
uint32_t GetCallbackBufferSize() const;
// Returns a given frames-per-buffer size from audio infra.
int GetFramesPerBuffer() const;
// Sets the detect silence flag for the platform destination.
void SetDetectSilence(bool detect_silence);
private:
explicit RealtimeAudioDestinationHandler(AudioNode&,
const WebAudioLatencyHint&,
base::Optional<float> sample_rate);
void CreatePlatformDestination();
void StartPlatformDestination();
void StopPlatformDestination();
// Checks the current silent detection condition (e.g. the number of
// automatic pull nodes) and flips the switch if necessary. Called within the
// Render() method.
void SetDetectSilenceIfNecessary(bool has_automatic_pull_nodes);
const WebAudioLatencyHint latency_hint_;
// Holds the audio device thread that runs the real time audio context.
scoped_refptr<AudioDestination> platform_destination_;
base::Optional<float> sample_rate_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// Represents the current condition of silence detection. By default, the
// silence detection is active.
bool is_detecting_silence_ = true;
};
// -----------------------------------------------------------------------------
class RealtimeAudioDestinationNode final : public AudioDestinationNode {
public:
static RealtimeAudioDestinationNode* Create(
AudioContext*,
const WebAudioLatencyHint&,
base::Optional<float> sample_rate);
explicit RealtimeAudioDestinationNode(AudioContext&,
const WebAudioLatencyHint&,
base::Optional<float> sample_rate);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_REALTIME_AUDIO_DESTINATION_NODE_H_
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