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