opensles_input.h revision d0247b1b59f9c528cb6df88b4f2b9afaf80d181e 
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
18namespace media {
19
20class 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 given to us from an internal OpenSLES audio thread.
25// All public methods should be called on the Audio Manager thread.
26class 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