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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
#define MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
#include "base/android/jni_android.h"
#include "base/threading/thread_checker.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
namespace media {
class AudioManagerAndroid;
// Implements PCM audio input support for Android using the Java AudioRecord
// interface. Most of the work is done by its Java counterpart in
// AudioRecordInput.java. This class is created and lives on the Audio Manager
// thread but recorded audio buffers are delivered on a thread managed by
// the Java class.
//
// The Java class makes use of AudioEffect features which are first available
// in Jelly Bean. It should not be instantiated running against earlier SDKs.
class MEDIA_EXPORT AudioRecordInputStream : public AudioInputStream {
public:
AudioRecordInputStream(AudioManagerAndroid* manager,
const AudioParameters& params);
virtual ~AudioRecordInputStream();
// Implementation of AudioInputStream.
virtual bool Open() OVERRIDE;
virtual void Start(AudioInputCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Close() OVERRIDE;
virtual double GetMaxVolume() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual double GetVolume() OVERRIDE;
virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
virtual bool GetAutomaticGainControl() OVERRIDE;
static bool RegisterAudioRecordInput(JNIEnv* env);
// Called from Java when data is available.
void OnData(JNIEnv* env, jobject obj, jint size, jint hardware_delay_bytes);
// Called from Java so that we can cache the address of the Java-managed
// |byte_buffer| in |direct_buffer_address_|.
void CacheDirectBufferAddress(JNIEnv* env, jobject obj, jobject byte_buffer);
private:
base::ThreadChecker thread_checker_;
AudioManagerAndroid* audio_manager_;
// Java AudioRecordInput instance.
base::android::ScopedJavaGlobalRef<jobject> j_audio_record_;
// This is the only member accessed by both the Audio Manager and Java
// threads. Explanations for why we do not require explicit synchronization
// are given in the implementation.
AudioInputCallback* callback_;
// Owned by j_audio_record_.
uint8* direct_buffer_address_;
DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_
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