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 13 namespace media { 14 15 class AudioBus; 16 class 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. 26 class 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 44 static bool RegisterAudioRecordInput(JNIEnv* env); 45 46 // Called from Java when data is available. 47 void OnData(JNIEnv* env, jobject obj, jint size, jint hardware_delay_bytes); 48 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); 52 53 private: 54 base::ThreadChecker thread_checker_; 55 AudioManagerAndroid* audio_manager_; 56 57 // Java AudioRecordInput instance. 58 base::android::ScopedJavaGlobalRef<jobject> j_audio_record_; 59 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_; 64 65 // Owned by j_audio_record_. 66 uint8* direct_buffer_address_; 67 68 scoped_ptr<media::AudioBus> audio_bus_; 69 int bytes_per_sample_; 70 71 DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream); 72 }; 73 74 } // namespace media 75 76 #endif // MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_ 77
