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95 lines
2.8 KiB
95 lines
2.8 KiB
/*
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef OBOE_HELLO_OBOE_ENGINE_H
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#define OBOE_HELLO_OBOE_ENGINE_H
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#include <oboe/Oboe.h>
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#include "SoundGenerator.h"
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#include "LatencyTuningCallback.h"
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#include "IRestartable.h"
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#include "DefaultErrorCallback.h"
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constexpr int32_t kBufferSizeAutomatic = 0;
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class HelloOboeEngine : public IRestartable {
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public:
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HelloOboeEngine();
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virtual ~HelloOboeEngine() = default;
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void tap(bool isDown);
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/**
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* Open and start a stream.
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* @param deviceId the audio device id, can be obtained through an {@link AudioDeviceInfo} object
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* using Java/JNI.
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* @return error or OK
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*/
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oboe::Result start(oboe::AudioApi audioApi, int deviceId, int channelCount);
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/* Start using current settings. */
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oboe::Result start();
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/**
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* Stop and close the stream.
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*/
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oboe::Result stop();
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// From IRestartable
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void restart() override;
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void setBufferSizeInBursts(int32_t numBursts);
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/**
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* Calculate the current latency between writing a frame to the output stream and
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* the same frame being presented to the audio hardware.
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*
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* Here's how the calculation works:
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*
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* 1) Get the time a particular frame was presented to the audio hardware
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* @see AudioStream::getTimestamp
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* 2) From this extrapolate the time which the *next* audio frame written to the stream
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* will be presented
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* 3) Assume that the next audio frame is written at the current time
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* 4) currentLatency = nextFramePresentationTime - nextFrameWriteTime
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*
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* @return Output Latency in Milliseconds
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*/
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double getCurrentOutputLatencyMillis();
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bool isLatencyDetectionSupported();
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bool isAAudioRecommended();
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private:
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oboe::Result reopenStream();
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oboe::Result openPlaybackStream();
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std::shared_ptr<oboe::AudioStream> mStream;
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std::shared_ptr<LatencyTuningCallback> mLatencyCallback;
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std::shared_ptr<DefaultErrorCallback> mErrorCallback;
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std::shared_ptr<SoundGenerator> mAudioSource;
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bool mIsLatencyDetectionSupported = false;
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int32_t mDeviceId = oboe::Unspecified;
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int32_t mChannelCount = oboe::Unspecified;
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oboe::AudioApi mAudioApi = oboe::AudioApi::Unspecified;
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std::mutex mLock;
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};
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#endif //OBOE_HELLO_OBOE_ENGINE_H
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