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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 <stdint.h>
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "content/common/content_export.h"
#include "media/base/audio_parameters.h"
#include "media/base/audio_renderer_sink.h"
#include "third_party/blink/public/platform/web_audio_device.h"
#include "third_party/blink/public/platform/web_audio_latency_hint.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class SilentSinkSuspender;
}
namespace content {
class CONTENT_EXPORT RendererWebAudioDeviceImpl
: public blink::WebAudioDevice,
public media::AudioRendererSink::RenderCallback {
public:
~RendererWebAudioDeviceImpl() override;
static std::unique_ptr<RendererWebAudioDeviceImpl> Create(
media::ChannelLayout layout,
int channels,
const blink::WebAudioLatencyHint& latency_hint,
blink::WebAudioDevice::RenderCallback* callback,
int session_id);
// blink::WebAudioDevice implementation.
void Start() override;
void Stop() override;
double SampleRate() override;
int FramesPerBuffer() override;
// AudioRendererSink::RenderCallback implementation.
int Render(base::TimeDelta delay,
base::TimeTicks delay_timestamp,
int prior_frames_skipped,
media::AudioBus* dest) override;
void OnRenderError() override;
void SetMediaTaskRunnerForTesting(
const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner);
const media::AudioParameters& get_sink_params_for_testing() {
return sink_params_;
}
protected:
// Callback to get output device params (for tests).
using OutputDeviceParamsCallback =
base::Callback<media::AudioParameters(int frame_id,
int session_id,
const std::string& device_id)>;
// Callback get render frame ID for current context (for tests).
using RenderFrameIdCallback = base::Callback<int()>;
RendererWebAudioDeviceImpl(media::ChannelLayout layout,
int channels,
const blink::WebAudioLatencyHint& latency_hint,
blink::WebAudioDevice::RenderCallback* callback,
int session_id,
const OutputDeviceParamsCallback& device_params_cb,
const RenderFrameIdCallback& render_frame_id_cb);
private:
const scoped_refptr<base::SingleThreadTaskRunner>& GetMediaTaskRunner();
media::AudioParameters sink_params_;
const blink::WebAudioLatencyHint latency_hint_;
// 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::AudioRendererSink> sink_;
// ID to allow browser to select the correct input device for unified IO.
int session_id_;
// Used to suspend |sink_| usage when silence has been detected for too long.
std::unique_ptr<media::SilentSinkSuspender> webaudio_suspender_;
// Render frame routing ID for the current context.
int frame_id_;
// Allow unit tests to set a custom MediaThreadTaskRunner.
scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
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