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