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 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
