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/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef OBOE_HELLO_OBOE_ENGINE_H
#define OBOE_HELLO_OBOE_ENGINE_H
#include <oboe/Oboe.h>
#include "SoundGenerator.h"
#include "LatencyTuningCallback.h"
#include "IRestartable.h"
constexpr int32_t kBufferSizeAutomatic = 0;
class HelloOboeEngine : public IRestartable {
public:
HelloOboeEngine();
virtual ~HelloOboeEngine() = default;
void tap(bool isDown);
/**
* Open and start a stream.
* @return error or OK
*/
oboe::Result start();
/**
* Stop and close the stream.
*/
void stop();
// From IRestartable
void restart() override;
// These methods reset the underlying stream with new properties
/**
* Set the audio device which should be used for playback. Can be set to oboe::kUnspecified if
* you want to use the default playback device (which is usually the built-in speaker if
* no other audio devices, such as headphones, are attached).
*
* @param deviceId the audio device id, can be obtained through an {@link AudioDeviceInfo} object
* using Java/JNI.
*/
void setDeviceId(int32_t deviceId);
void setChannelCount(int channelCount);
void setAudioApi(oboe::AudioApi audioApi);
void setBufferSizeInBursts(int32_t numBursts);
/**
* Calculate the current latency between writing a frame to the output stream and
* the same frame being presented to the audio hardware.
*
* Here's how the calculation works:
*
* 1) Get the time a particular frame was presented to the audio hardware
* @see AudioStream::getTimestamp
* 2) From this extrapolate the time which the *next* audio frame written to the stream
* will be presented
* 3) Assume that the next audio frame is written at the current time
* 4) currentLatency = nextFramePresentationTime - nextFrameWriteTime
*
* @return Output Latency in Milliseconds
*/
double getCurrentOutputLatencyMillis();
bool isLatencyDetectionSupported();
private:
oboe::Result reopenStream();
oboe::Result createPlaybackStream();
void updateLatencyDetection();
std::shared_ptr<oboe::AudioStream> mStream;
std::unique_ptr<LatencyTuningCallback> mLatencyCallback;
std::shared_ptr<SoundGenerator> mAudioSource;
bool mIsLatencyDetectionSupported = false;
int32_t mDeviceId = oboe::Unspecified;
int32_t mChannelCount = oboe::Unspecified;
oboe::AudioApi mAudioApi = oboe::AudioApi::Unspecified;
std::mutex mLock;
};
#endif //OBOE_HELLO_OBOE_ENGINE_H
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