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53 lines
1.6 KiB
53 lines
1.6 KiB
/*
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* Copyright 2021 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 MEGA_PLAYER_BLIPAUDIOSOURCE_H
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#define MEGA_PLAYER_BLIPAUDIOSOURCE_H
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#include <atomic>
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#include "WaveTableSource.h"
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class BlipAudioSource: public WaveTableSource {
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private:
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// 1/16 second @48000 Hz
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static const int NUM_PULSE_FRAMES = (int) (48000 * (1.0 / 16.0));
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int mNumPendingPulseFrames;
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public:
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BlipAudioSource();
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/**
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* Triggers a "blip" in the output
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*/
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virtual void trigger();
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/**
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* Fills the specified buffer with silence until triggered and then with
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* a short sine tone.
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* @return The number of frames generated. Since we are generating a continuous periodic
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* signal, this will always be <code>numFrames</code>.
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*/
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virtual int pull(float* buffer, int numFrames, int numChans) override;
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std::atomic<int> mRequestCount; // external thread increments this to request a beep
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std::atomic<int> mAcknowledgeCount; // audio thread sets this to acknowledge
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};
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#endif // MEGA_PLAYER_BLIPAUDIOSOURCE_H
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