opensles_input.h revision ab8f6f0bd665d3c1ff476eb06c58c42630e462d4 
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 AudioBus;
21class 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.
27class 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  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_
107