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