audio_record_input.h revision ab8f6f0bd665d3c1ff476eb06c58c42630e462d4 
1// Copyright 2013 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_AUDIO_RECORD_INPUT_H_
6#define MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
7
8#include "base/android/jni_android.h"
9#include "base/threading/thread_checker.h"
10#include "media/audio/audio_io.h"
11#include "media/audio/audio_parameters.h"
12
13namespace media {
14
15class AudioBus;
16class AudioManagerAndroid;
17
18// Implements PCM audio input support for Android using the Java AudioRecord
19// interface. Most of the work is done by its Java counterpart in
20// AudioRecordInput.java. This class is created and lives on the Audio Manager
21// thread but recorded audio buffers are delivered on a thread managed by
22// the Java class.
23//
24// The Java class makes use of AudioEffect features which are first available
25// in Jelly Bean. It should not be instantiated running against earlier SDKs.
26class MEDIA_EXPORT AudioRecordInputStream : public AudioInputStream {
27 public:
28  AudioRecordInputStream(AudioManagerAndroid* manager,
29                         const AudioParameters& params);
30
31  virtual ~AudioRecordInputStream();
32
33  // Implementation of AudioInputStream.
34  virtual bool Open() OVERRIDE;
35  virtual void Start(AudioInputCallback* callback) OVERRIDE;
36  virtual void Stop() OVERRIDE;
37  virtual void Close() OVERRIDE;
38  virtual double GetMaxVolume() OVERRIDE;
39  virtual void SetVolume(double volume) OVERRIDE;
40  virtual double GetVolume() OVERRIDE;
41  virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
42  virtual bool GetAutomaticGainControl() OVERRIDE;
43  virtual bool IsMuted() OVERRIDE;
44
45  static bool RegisterAudioRecordInput(JNIEnv* env);
46
47  // Called from Java when data is available.
48  void OnData(JNIEnv* env, jobject obj, jint size, jint hardware_delay_bytes);
49
50  // Called from Java so that we can cache the address of the Java-managed
51  // |byte_buffer| in |direct_buffer_address_|.
52  void CacheDirectBufferAddress(JNIEnv* env, jobject obj, jobject byte_buffer);
53
54 private:
55  base::ThreadChecker thread_checker_;
56  AudioManagerAndroid* audio_manager_;
57
58  // Java AudioRecordInput instance.
59  base::android::ScopedJavaGlobalRef<jobject> j_audio_record_;
60
61  // This is the only member accessed by both the Audio Manager and Java
62  // threads. Explanations for why we do not require explicit synchronization
63  // are given in the implementation.
64  AudioInputCallback* callback_;
65
66  // Owned by j_audio_record_.
67  uint8* direct_buffer_address_;
68
69  scoped_ptr<media::AudioBus> audio_bus_;
70  int bytes_per_sample_;
71
72  DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream);
73};
74
75}  // namespace media
76
77#endif  // MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
78