1*05767d91SRobert Wu /* 2*05767d91SRobert Wu * Copyright (C) 2016 The Android Open Source Project 3*05767d91SRobert Wu * 4*05767d91SRobert Wu * Licensed under the Apache License, Version 2.0 (the "License"); 5*05767d91SRobert Wu * you may not use this file except in compliance with the License. 6*05767d91SRobert Wu * You may obtain a copy of the License at 7*05767d91SRobert Wu * 8*05767d91SRobert Wu * http://www.apache.org/licenses/LICENSE-2.0 9*05767d91SRobert Wu * 10*05767d91SRobert Wu * Unless required by applicable law or agreed to in writing, software 11*05767d91SRobert Wu * distributed under the License is distributed on an "AS IS" BASIS, 12*05767d91SRobert Wu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*05767d91SRobert Wu * See the License for the specific language governing permissions and 14*05767d91SRobert Wu * limitations under the License. 15*05767d91SRobert Wu */ 16*05767d91SRobert Wu 17*05767d91SRobert Wu #ifndef OBOE_AUDIO_CLOCK_H 18*05767d91SRobert Wu #define OBOE_AUDIO_CLOCK_H 19*05767d91SRobert Wu 20*05767d91SRobert Wu #include <sys/types.h> 21*05767d91SRobert Wu #include <ctime> 22*05767d91SRobert Wu #include "oboe/Definitions.h" 23*05767d91SRobert Wu 24*05767d91SRobert Wu namespace oboe { 25*05767d91SRobert Wu 26*05767d91SRobert Wu // TODO: Move this class into the public headers because it is useful when calculating stream latency 27*05767d91SRobert Wu class AudioClock { 28*05767d91SRobert Wu public: 29*05767d91SRobert Wu static int64_t getNanoseconds(clockid_t clockId = CLOCK_MONOTONIC) { 30*05767d91SRobert Wu struct timespec time; 31*05767d91SRobert Wu int result = clock_gettime(clockId, &time); 32*05767d91SRobert Wu if (result < 0) { 33*05767d91SRobert Wu return result; 34*05767d91SRobert Wu } 35*05767d91SRobert Wu return (time.tv_sec * kNanosPerSecond) + time.tv_nsec; 36*05767d91SRobert Wu } 37*05767d91SRobert Wu 38*05767d91SRobert Wu /** 39*05767d91SRobert Wu * Sleep until the specified time. 40*05767d91SRobert Wu * 41*05767d91SRobert Wu * @param nanoTime time to wake up 42*05767d91SRobert Wu * @param clockId CLOCK_MONOTONIC is default 43*05767d91SRobert Wu * @return 0 or a negative error, eg. -EINTR 44*05767d91SRobert Wu */ 45*05767d91SRobert Wu 46*05767d91SRobert Wu static int sleepUntilNanoTime(int64_t nanoTime, clockid_t clockId = CLOCK_MONOTONIC) { 47*05767d91SRobert Wu struct timespec time; 48*05767d91SRobert Wu time.tv_sec = nanoTime / kNanosPerSecond; 49*05767d91SRobert Wu time.tv_nsec = nanoTime - (time.tv_sec * kNanosPerSecond); 50*05767d91SRobert Wu return 0 - clock_nanosleep(clockId, TIMER_ABSTIME, &time, NULL); 51*05767d91SRobert Wu } 52*05767d91SRobert Wu 53*05767d91SRobert Wu /** 54*05767d91SRobert Wu * Sleep for the specified number of nanoseconds in real-time. 55*05767d91SRobert Wu * Return immediately with 0 if a negative nanoseconds is specified. 56*05767d91SRobert Wu * 57*05767d91SRobert Wu * @param nanoseconds time to sleep 58*05767d91SRobert Wu * @param clockId CLOCK_REALTIME is default 59*05767d91SRobert Wu * @return 0 or a negative error, eg. -EINTR 60*05767d91SRobert Wu */ 61*05767d91SRobert Wu 62*05767d91SRobert Wu static int sleepForNanos(int64_t nanoseconds, clockid_t clockId = CLOCK_REALTIME) { 63*05767d91SRobert Wu if (nanoseconds > 0) { 64*05767d91SRobert Wu struct timespec time; 65*05767d91SRobert Wu time.tv_sec = nanoseconds / kNanosPerSecond; 66*05767d91SRobert Wu time.tv_nsec = nanoseconds - (time.tv_sec * kNanosPerSecond); 67*05767d91SRobert Wu return 0 - clock_nanosleep(clockId, 0, &time, NULL); 68*05767d91SRobert Wu } 69*05767d91SRobert Wu return 0; 70*05767d91SRobert Wu } 71*05767d91SRobert Wu }; 72*05767d91SRobert Wu 73*05767d91SRobert Wu } // namespace oboe 74*05767d91SRobert Wu 75*05767d91SRobert Wu #endif //OBOE_AUDIO_CLOCK_H 76