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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
#define CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
#include "base/cancelable_callback.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "media/audio/audio_parameters.h"
#include "media/base/audio_renderer_sink.h"
#include "third_party/WebKit/public/platform/WebAudioDevice.h"
#include "third_party/WebKit/public/platform/WebVector.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class AudioOutputDevice;
class NullAudioSink;
}
namespace content {
class RendererWebAudioDeviceImpl
: public blink::WebAudioDevice,
public media::AudioRendererSink::RenderCallback {
public:
RendererWebAudioDeviceImpl(const media::AudioParameters& params,
blink::WebAudioDevice::RenderCallback* callback,
int session_id);
~RendererWebAudioDeviceImpl() override;
// blink::WebAudioDevice implementation.
void start() override;
void stop() override;
double sampleRate() override;
// AudioRendererSink::RenderCallback implementation.
int Render(media::AudioBus* dest, int audio_delay_milliseconds) override;
void OnRenderError() override;
private:
const media::AudioParameters params_;
// Weak reference to the callback into WebKit code.
blink::WebAudioDevice::RenderCallback* const client_callback_;
// To avoid the need for locking, ensure the control methods of the
// blink::WebAudioDevice implementation are called on the same thread.
base::ThreadChecker thread_checker_;
// When non-NULL, we are started. When NULL, we are stopped.
scoped_refptr<media::AudioOutputDevice> output_device_;
// ID to allow browser to select the correct input device for unified IO.
int session_id_;
// Timeticks when the silence starts.
base::TimeTicks first_silence_time_ ;
// TaskRunner to post callbacks to the render thread.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// A fake audio sink object that consumes data when long period of silence
// audio is detected. This object lives on the render thread.
scoped_refptr<media::NullAudioSink> null_audio_sink_;
// Whether audio output is directed to |null_audio_sink_|.
bool is_using_null_audio_sink_;
// First audio buffer after silence finishes. We store this buffer so that
// it can be sent to the |output_device_| later after switching from
// |null_audio_sink_|.
scoped_ptr<media::AudioBus> first_buffer_after_silence_;
bool is_first_buffer_after_silence_;
// A cancelable task that is posted to start the |null_audio_sink_| after a
// period of silence. We do this on android to save battery consumption.
base::CancelableClosure start_null_audio_sink_callback_;
DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
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