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
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