media/audio/android/audio_manager_android.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
   6 #define MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
   7
   8 #include <set>
   9
  10 #include "base/android/jni_android.h"
  11 #include "base/gtest_prod_util.h"
  12 #include "base/synchronization/lock.h"
  13 #include "base/synchronization/waitable_event.h"
  14 #include "media/audio/audio_manager_base.h"
  15
  16 namespace media {
  17
  18 class OpenSLESOutputStream;
  19
  20 // Android implemention of AudioManager.
  21 class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
  22  public:
  23   AudioManagerAndroid(AudioLogFactory* audio_log_factory);
  24
  25   // Implementation of AudioManager.
  26   bool HasAudioOutputDevices() override;
  27   bool HasAudioInputDevices() override;
  28   void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
  29   void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
  30   AudioParameters GetInputStreamParameters(
  31       const std::string& device_id) override;
  32
  33   AudioOutputStream* MakeAudioOutputStream(
  34       const AudioParameters& params,
  35       const std::string& device_id) override;
  36   AudioInputStream* MakeAudioInputStream(const AudioParameters& params,
  37                                          const std::string& device_id) override;
  38   void ReleaseOutputStream(AudioOutputStream* stream) override;
  39   void ReleaseInputStream(AudioInputStream* stream) override;
  40
  41   // Implementation of AudioManagerBase.
  42   AudioOutputStream* MakeLinearOutputStream(
  43       const AudioParameters& params) override;
  44   AudioOutputStream* MakeLowLatencyOutputStream(
  45       const AudioParameters& params,
  46       const std::string& device_id) override;
  47   AudioInputStream* MakeLinearInputStream(
  48       const AudioParameters& params,
  49       const std::string& device_id) override;
  50   AudioInputStream* MakeLowLatencyInputStream(
  51       const AudioParameters& params,
  52       const std::string& device_id) override;
  53
  54   static bool RegisterAudioManager(JNIEnv* env);
  55
  56   void SetMute(JNIEnv* env, jobject obj, jboolean muted);
  57
  58   // Sets a volume that applies to all this manager's output audio streams.
  59   // This overrides other SetVolume calls (e.g. through AudioHostMsg_SetVolume).
  60   void SetOutputVolumeOverride(double volume);
  61   bool HasOutputVolumeOverride(double* out_volume) const;
  62
  63  protected:
  64   ~AudioManagerAndroid() override;
  65
  66   AudioParameters GetPreferredOutputStreamParameters(
  67       const std::string& output_device_id,
  68       const AudioParameters& input_params) override;
  69
  70  private:
  71   void InitializeOnAudioThread();
  72   void ShutdownOnAudioThread();
  73
  74   bool HasNoAudioInputStreams();
  75   void SetCommunicationAudioModeOn(bool on);
  76   bool SetAudioDevice(const std::string& device_id);
  77   int GetNativeOutputSampleRate();
  78   bool IsAudioLowLatencySupported();
  79   int GetAudioLowLatencyOutputFrameSize();
  80   int GetOptimalOutputFrameSize(int sample_rate, int channels);
  81
  82   void DoSetMuteOnAudioThread(bool muted);
  83   void DoSetVolumeOnAudioThread(double volume);
  84
  85   // Java AudioManager instance.
  86   base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;
  87
  88   typedef std::set<OpenSLESOutputStream*> OutputStreams;
  89   OutputStreams streams_;
  90
  91   // Enabled when first input stream is created and set to false when last
  92   // input stream is destroyed. Also affects the stream type of output streams.
  93   bool communication_mode_is_on_;
  94
  95   // If set, overrides volume level on output streams
  96   bool output_volume_override_set_;
  97   double output_volume_override_;
  98
  99   DISALLOW_COPY_AND_ASSIGN(AudioManagerAndroid);
 100 };
 101
 102 }  // namespace media
 103
 104 #endif  // MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_