media/audio/android/opensles_input.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_OPENSLES_INPUT_H_
   6 #define MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_
   7
   8 #include <SLES/OpenSLES.h>
   9 #include <SLES/OpenSLES_Android.h>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/synchronization/lock.h"
  13 #include "base/threading/thread_checker.h"
  14 #include "media/audio/android/opensles_util.h"
  15 #include "media/audio/audio_io.h"
  16 #include "media/audio/audio_parameters.h"
  17
  18 namespace media {
  19
  20 class AudioBus;
  21 class AudioManagerAndroid;
  22
  23 // Implements PCM audio input support for Android using the OpenSLES API.
  24 // This class is created and lives on the Audio Manager thread but recorded
  25 // audio buffers are delivered on an internal OpenSLES audio thread. All public
  26 // methods should be called on the Audio Manager thread.
  27 class OpenSLESInputStream : public AudioInputStream {
  28  public:
  29   static const int kMaxNumOfBuffersInQueue = 2;
  30
  31   OpenSLESInputStream(AudioManagerAndroid* manager,
  32                       const AudioParameters& params);
  33
  34   virtual ~OpenSLESInputStream();
  35
  36   // Implementation of AudioInputStream.
  37   virtual bool Open() override;
  38   virtual void Start(AudioInputCallback* callback) override;
  39   virtual void Stop() override;
  40   virtual void Close() override;
  41   virtual double GetMaxVolume() override;
  42   virtual void SetVolume(double volume) override;
  43   virtual double GetVolume() override;
  44   virtual bool SetAutomaticGainControl(bool enabled) override;
  45   virtual bool GetAutomaticGainControl() override;
  46   virtual bool IsMuted() override;
  47
  48  private:
  49   bool CreateRecorder();
  50
  51   // Called from OpenSLES specific audio worker thread.
  52   static void SimpleBufferQueueCallback(
  53       SLAndroidSimpleBufferQueueItf buffer_queue,
  54       void* instance);
  55
  56   // Called from OpenSLES specific audio worker thread.
  57   void ReadBufferQueue();
  58
  59   // Called in Open();
  60   void SetupAudioBuffer();
  61
  62   // Called in Close();
  63   void ReleaseAudioBuffer();
  64
  65   // If OpenSLES reports an error this function handles it and passes it to
  66   // the attached AudioInputCallback::OnError().
  67   void HandleError(SLresult error);
  68
  69   base::ThreadChecker thread_checker_;
  70
  71   // Protects |callback_|, |active_buffer_index_|, |audio_data_|,
  72   // |buffer_size_bytes_| and |simple_buffer_queue_|.
  73   base::Lock lock_;
  74
  75   AudioManagerAndroid* audio_manager_;
  76
  77   AudioInputCallback* callback_;
  78
  79   // Shared engine interfaces for the app.
  80   media::ScopedSLObjectItf recorder_object_;
  81   media::ScopedSLObjectItf engine_object_;
  82
  83   SLRecordItf recorder_;
  84
  85   // Buffer queue recorder interface.
  86   SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
  87
  88   SLDataFormat_PCM format_;
  89
  90   // Audio buffers that are allocated in the constructor based on
  91   // info from audio parameters.
  92   uint8* audio_data_[kMaxNumOfBuffersInQueue];
  93
  94   int active_buffer_index_;
  95   int buffer_size_bytes_;
  96
  97   bool started_;
  98
  99   scoped_ptr<media::AudioBus> audio_bus_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(OpenSLESInputStream);
 102 };
 103
 104 }  // namespace media
 105
 106 #endif  // MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_