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70 lines
1.8 KiB
70 lines
1.8 KiB
/*
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* Copyright (C) 2016 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 AAUDIO_TIMESTAMP_SCHEDULER_H
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#define AAUDIO_TIMESTAMP_SCHEDULER_H
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#include <aaudio/AAudio.h>
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#include <utility/AudioClock.h>
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namespace aaudio {
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/**
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* Schedule wakeup time for monitoring the position
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* of an MMAP/NOIRQ buffer.
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*
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* Note that this object is not thread safe. Only call it from a single thread.
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*/
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class TimestampScheduler
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{
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public:
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TimestampScheduler() {};
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virtual ~TimestampScheduler() = default;
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/**
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* Start the schedule at the given time.
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*/
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void start(int64_t startTime);
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/**
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* Calculate the next time that the read position should be measured.
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*/
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int64_t nextAbsoluteTime();
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void setBurstPeriod(int64_t burstPeriod) {
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mBurstPeriod = burstPeriod;
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}
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void setBurstPeriod(int32_t framesPerBurst,
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int32_t sampleRate) {
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mBurstPeriod = AAUDIO_NANOS_PER_SECOND * framesPerBurst / sampleRate;
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}
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int64_t getBurstPeriod() {
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return mBurstPeriod;
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}
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private:
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// Start with an arbitrary default so we do not divide by zero.
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int64_t mBurstPeriod = AAUDIO_NANOS_PER_MILLISECOND;
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int64_t mStartTime = 0;
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int64_t mLastTime = 0;
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};
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} /* namespace aaudio */
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#endif /* AAUDIO_TIMESTAMP_SCHEDULER_H */
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