mirror of
https://github.com/hajimehoshi/ebiten.git
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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/*
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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 OBOE_AUDIO_CLOCK_H
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#define OBOE_AUDIO_CLOCK_H
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#include <sys/types.h>
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#include <ctime>
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#include "oboe_oboe_Definitions_android.h"
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namespace oboe {
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// TODO: Move this class into the public headers because it is useful when calculating stream latency
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class AudioClock {
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public:
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static int64_t getNanoseconds(clockid_t clockId = CLOCK_MONOTONIC) {
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struct timespec time;
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int result = clock_gettime(clockId, &time);
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if (result < 0) {
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return result;
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}
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return (time.tv_sec * kNanosPerSecond) + time.tv_nsec;
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}
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/**
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* Sleep until the specified time.
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*
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* @param nanoTime time to wake up
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* @param clockId CLOCK_MONOTONIC is default
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* @return 0 or a negative error, eg. -EINTR
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*/
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static int sleepUntilNanoTime(int64_t nanoTime, clockid_t clockId = CLOCK_MONOTONIC) {
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struct timespec time;
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time.tv_sec = nanoTime / kNanosPerSecond;
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time.tv_nsec = nanoTime - (time.tv_sec * kNanosPerSecond);
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return 0 - clock_nanosleep(clockId, TIMER_ABSTIME, &time, NULL);
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}
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/**
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* Sleep for the specified number of nanoseconds in real-time.
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* Return immediately with 0 if a negative nanoseconds is specified.
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*
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* @param nanoseconds time to sleep
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* @param clockId CLOCK_REALTIME is default
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* @return 0 or a negative error, eg. -EINTR
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*/
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static int sleepForNanos(int64_t nanoseconds, clockid_t clockId = CLOCK_REALTIME) {
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if (nanoseconds > 0) {
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struct timespec time;
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time.tv_sec = nanoseconds / kNanosPerSecond;
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time.tv_nsec = nanoseconds - (time.tv_sec * kNanosPerSecond);
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return 0 - clock_nanosleep(clockId, 0, &time, NULL);
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}
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return 0;
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}
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};
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} // namespace oboe
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#endif //OBOE_AUDIO_CLOCK_H
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