text: // 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_ANDROID_AUDIO_MANAGER_ANDROID_H_
  #define MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
  
  #include <set>
  
  #include "base/android/jni_android.h"
  #include "base/gtest_prod_util.h"
  #include "base/synchronization/lock.h"
  #include "base/synchronization/waitable_event.h"
  #include "media/audio/audio_manager_base.h"
  
  namespace media {
  
  class OpenSLESOutputStream;
  
  // Android implemention of AudioManager.
  class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
   public:
    AudioManagerAndroid(AudioLogFactory* audio_log_factory);
  
    // Implementation of AudioManager.
    virtual bool HasAudioOutputDevices() override;
    virtual bool HasAudioInputDevices() override;
    virtual void GetAudioInputDeviceNames(
        AudioDeviceNames* device_names) override;
    virtual void GetAudioOutputDeviceNames(
        AudioDeviceNames* device_names) override;
    virtual AudioParameters GetInputStreamParameters(
        const std::string& device_id) override;
  
    virtual AudioOutputStream* MakeAudioOutputStream(
        const AudioParameters& params,
        const std::string& device_id) override;
    virtual AudioInputStream* MakeAudioInputStream(
        const AudioParameters& params,
        const std::string& device_id) override;
    virtual void ReleaseOutputStream(AudioOutputStream* stream) override;
    virtual void ReleaseInputStream(AudioInputStream* stream) override;
  
    // Implementation of AudioManagerBase.
    virtual AudioOutputStream* MakeLinearOutputStream(
        const AudioParameters& params) override;
    virtual AudioOutputStream* MakeLowLatencyOutputStream(
        const AudioParameters& params,
        const std::string& device_id) override;
    virtual AudioInputStream* MakeLinearInputStream(
        const AudioParameters& params,
        const std::string& device_id) override;
    virtual AudioInputStream* MakeLowLatencyInputStream(
        const AudioParameters& params,
        const std::string& device_id) override;
  
    static bool RegisterAudioManager(JNIEnv* env);
  
    void SetMute(JNIEnv* env, jobject obj, jboolean muted);
  
   protected:
    virtual ~AudioManagerAndroid();
  
    virtual AudioParameters GetPreferredOutputStreamParameters(
        const std::string& output_device_id,
        const AudioParameters& input_params) override;
  
   private:
    void InitializeOnAudioThread();
    void ShutdownOnAudioThread();
  
    bool HasNoAudioInputStreams();
    void SetCommunicationAudioModeOn(bool on);
    bool SetAudioDevice(const std::string& device_id);
    int GetNativeOutputSampleRate();
    bool IsAudioLowLatencySupported();
    int GetAudioLowLatencyOutputFrameSize();
    int GetOptimalOutputFrameSize(int sample_rate, int channels);
  
    void DoSetMuteOnAudioThread(bool muted);
  
    // Java AudioManager instance.
    base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;
  
    typedef std::set<OpenSLESOutputStream*> OutputStreams;
    OutputStreams streams_;
  
    // Enabled when first input stream is created and set to false when last
    // input stream is destroyed. Also affects the stream type of output streams.
    bool communication_mode_is_on_;
  
    DISALLOW_COPY_AND_ASSIGN(AudioManagerAndroid);
  };
  
  }  // namespace media
  
  #endif  // MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
  