opensles_input.h revision eb525c5499e34cc9c4b825d6d9e75bb07cc06ace 
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 "media/audio/audio_io.h"
13#include "media/audio/audio_parameters.h"
14#include "media/audio/android/opensles_util.h"
15
16namespace media {
17
18class AudioManagerAndroid;
19
20// Implements PCM audio input support for Android using the OpenSLES API.
21class OpenSLESInputStream : public AudioInputStream {
22 public:
23  static const int kNumOfQueuesInBuffer = 2;
24
25  OpenSLESInputStream(AudioManagerAndroid* manager,
26                      const AudioParameters& params);
27
28  virtual ~OpenSLESInputStream();
29
30  // Implementation of AudioInputStream.
31  virtual bool Open() OVERRIDE;
32  virtual void Start(AudioInputCallback* callback) OVERRIDE;
33  virtual void Stop() OVERRIDE;
34  virtual void Close() OVERRIDE;
35  virtual double GetMaxVolume() OVERRIDE;
36  virtual void SetVolume(double volume) OVERRIDE;
37  virtual double GetVolume() OVERRIDE;
38  virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
39  virtual bool GetAutomaticGainControl() OVERRIDE;
40
41 private:
42  bool CreateRecorder();
43
44  static void SimpleBufferQueueCallback(
45      SLAndroidSimpleBufferQueueItf buffer_queue, void* instance);
46
47  void ReadBufferQueue();
48
49  // Called in Open();
50  void SetupAudioBuffer();
51
52  // Called in Close();
53  void ReleaseAudioBuffer();
54
55  // If OpenSLES reports an error this function handles it and passes it to
56  // the attached AudioInputCallback::OnError().
57  void HandleError(SLresult error);
58
59  AudioManagerAndroid* audio_manager_;
60
61  AudioInputCallback* callback_;
62
63  // Shared engine interfaces for the app.
64  media::ScopedSLObjectItf recorder_object_;
65  media::ScopedSLObjectItf engine_object_;
66
67  SLRecordItf recorder_;
68
69  // Buffer queue recorder interface.
70  SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
71
72  SLDataFormat_PCM format_;
73
74  // Audio buffers that are allocated in the constructor based on
75  // info from audio parameters.
76  uint8* audio_data_[kNumOfQueuesInBuffer];
77
78  int active_queue_;
79  int buffer_size_bytes_;
80
81  bool started_;
82
83  DISALLOW_COPY_AND_ASSIGN(OpenSLESInputStream);
84};
85
86}  // namespace media
87
88#endif  // MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_
89