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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 MEDIA_AUDIO_NULL_AUDIO_SINK_H_
- #define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
- #include <memory>
- #include <string>
- #include "base/memory/raw_ptr.h"
- #include "base/time/time.h"
- #include "media/base/audio_renderer_sink.h"
- namespace base {
- class SingleThreadTaskRunner;
- }
- namespace media {
- class AudioBus;
- class AudioHash;
- class FakeAudioWorker;
- class MEDIA_EXPORT NullAudioSink : public SwitchableAudioRendererSink {
- public:
- explicit NullAudioSink(
- const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
- NullAudioSink(const NullAudioSink&) = delete;
- NullAudioSink& operator=(const NullAudioSink&) = delete;
- // AudioRendererSink implementation.
- void Initialize(const AudioParameters& params,
- RenderCallback* callback) override;
- void Start() override;
- void Stop() override;
- void Pause() override;
- void Play() override;
- void Flush() override;
- bool SetVolume(double volume) override;
- OutputDeviceInfo GetOutputDeviceInfo() override;
- void GetOutputDeviceInfoAsync(OutputDeviceInfoCB info_cb) override;
- bool IsOptimizedForHardwareParameters() override;
- bool CurrentThreadIsRenderingThread() override;
- void SwitchOutputDevice(const std::string& device_id,
- OutputDeviceStatusCB callback) override;
- // Enables audio frame hashing. Must be called prior to Initialize().
- void StartAudioHashForTesting();
- // Returns the hash of all audio frames seen since construction.
- std::string GetAudioHashForTesting();
- protected:
- ~NullAudioSink() override;
- private:
- // Task that periodically calls Render() to consume audio data.
- void CallRender(base::TimeTicks ideal_time, base::TimeTicks now);
- bool initialized_;
- bool started_;
- bool playing_;
- raw_ptr<RenderCallback> callback_;
- // Controls whether or not a running hash is computed for audio frames.
- std::unique_ptr<AudioHash> audio_hash_;
- scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
- std::unique_ptr<FakeAudioWorker> fake_worker_;
- base::TimeDelta fixed_data_delay_;
- std::unique_ptr<AudioBus> audio_bus_;
- };
- } // namespace media
- #endif // MEDIA_AUDIO_NULL_AUDIO_SINK_H_
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