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.
5 #ifndef MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
6 #define MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
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"
16 class AudioManagerAndroid;
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
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.
26 class MEDIA_EXPORT AudioRecordInputStream : public AudioInputStream {
28 AudioRecordInputStream(AudioManagerAndroid* manager,
29 const AudioParameters& params);
31 virtual ~AudioRecordInputStream();
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;
44 static bool RegisterAudioRecordInput(JNIEnv* env);
46 // Called from Java when data is available.
47 void OnData(JNIEnv* env, jobject obj, jint size, jint hardware_delay_bytes);
49 // Called from Java so that we can cache the address of the Java-managed
50 // |byte_buffer| in |direct_buffer_address_|.
51 void CacheDirectBufferAddress(JNIEnv* env, jobject obj, jobject byte_buffer);
54 base::ThreadChecker thread_checker_;
55 AudioManagerAndroid* audio_manager_;
57 // Java AudioRecordInput instance.
58 base::android::ScopedJavaGlobalRef<jobject> j_audio_record_;
60 // This is the only member accessed by both the Audio Manager and Java
61 // threads. Explanations for why we do not require explicit synchronization
62 // are given in the implementation.
63 AudioInputCallback* callback_;
65 // Owned by j_audio_record_.
66 uint8* direct_buffer_address_;
68 scoped_ptr<media::AudioBus> audio_bus_;
69 int bytes_per_sample_;
71 DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream);
76 #endif // MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_