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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 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 void SetAutomaticGainControl(bool enabled) OVERRIDE;
     45   virtual bool GetAutomaticGainControl() OVERRIDE;
     46 
     47  private:
     48   bool CreateRecorder();
     49 
     50   // Called from OpenSLES specific audio worker thread.
     51   static void SimpleBufferQueueCallback(
     52       SLAndroidSimpleBufferQueueItf buffer_queue,
     53       void* instance);
     54 
     55   // Called from OpenSLES specific audio worker thread.
     56   void ReadBufferQueue();
     57 
     58   // Called in Open();
     59   void SetupAudioBuffer();
     60 
     61   // Called in Close();
     62   void ReleaseAudioBuffer();
     63 
     64   // If OpenSLES reports an error this function handles it and passes it to
     65   // the attached AudioInputCallback::OnError().
     66   void HandleError(SLresult error);
     67 
     68   base::ThreadChecker thread_checker_;
     69 
     70   // Protects |callback_|, |active_buffer_index_|, |audio_data_|,
     71   // |buffer_size_bytes_| and |simple_buffer_queue_|.
     72   base::Lock lock_;
     73 
     74   AudioManagerAndroid* audio_manager_;
     75 
     76   AudioInputCallback* callback_;
     77 
     78   // Shared engine interfaces for the app.
     79   media::ScopedSLObjectItf recorder_object_;
     80   media::ScopedSLObjectItf engine_object_;
     81 
     82   SLRecordItf recorder_;
     83 
     84   // Buffer queue recorder interface.
     85   SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
     86 
     87   SLDataFormat_PCM format_;
     88 
     89   // Audio buffers that are allocated in the constructor based on
     90   // info from audio parameters.
     91   uint8* audio_data_[kMaxNumOfBuffersInQueue];
     92 
     93   int active_buffer_index_;
     94   int buffer_size_bytes_;
     95 
     96   bool started_;
     97 
     98   scoped_ptr<media::AudioBus> audio_bus_;
     99 
    100   DISALLOW_COPY_AND_ASSIGN(OpenSLESInputStream);
    101 };
    102 
    103 }  // namespace media
    104 
    105 #endif  // MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_
    106