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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 <stdint.h>
#include <memory>
#include "base/android/jni_android.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_parameters.h"
namespace media {
class AudioBus;
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.
class MEDIA_EXPORT AudioRecordInputStream : public AudioInputStream {
public:
AudioRecordInputStream(AudioManagerAndroid* manager,
const AudioParameters& params);
~AudioRecordInputStream() override;
// Implementation of AudioInputStream.
bool Open() override;
void Start(AudioInputCallback* callback) override;
void Stop() override;
void Close() override;
double GetMaxVolume() override;
void SetVolume(double volume) override;
double GetVolume() override;
bool SetAutomaticGainControl(bool enabled) override;
bool GetAutomaticGainControl() override;
bool IsMuted() override;
// Called from Java when data is available.
void OnData(JNIEnv* env,
const base::android::JavaParamRef<jobject>& obj,
jint size,
jint hardware_delay_ms);
// Called from Java so that we can cache the address of the Java-managed
// |byte_buffer| in |direct_buffer_address_|.
void CacheDirectBufferAddress(
JNIEnv* env,
const base::android::JavaParamRef<jobject>& obj,
const base::android::JavaParamRef<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_t* direct_buffer_address_;
std::unique_ptr<media::AudioBus> audio_bus_;
int bytes_per_sample_;
DISALLOW_COPY_AND_ASSIGN(AudioRecordInputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_ANDROID_AUDIO_RECORD_INPUT_H_