137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/*
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* Copyright 2017 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 ANDROID_AUDIO_CLOCK_H
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#define ANDROID_AUDIO_CLOCK_H
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// This file can be included for either C or C++ source.
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/time.h>
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#include <time.h>
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// These are declared as macros for compatbility with existing uses.
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// TODO Spell out the words in full.
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#define MICROS_PER_SECOND 1000000LL
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#define MILLIS_PER_SECOND 1000LL
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#define NANOS_PER_MICROSECOND 1000LL
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#define NANOS_PER_MILLISECOND 1000000LL
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#define NANOS_PER_SECOND 1000000000LL
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#define SECONDS_PER_MINUTE 60LL
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#define MINUTES_PER_HOUR 60LL
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#define MICROS_PER_MINUTE (MICROS_PER_SECOND * SECONDS_PER_MINUTE)
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#define MILLIS_PER_MINUTE (MILLIS_PER_SECOND * SECONDS_PER_MINUTE)
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#define NANOS_PER_MINUTE (NANOS_PER_SECOND * SECONDS_PER_MINUTE)
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#define MICROS_PER_HOUR (MICROS_PER_MINUTE * MINUTES_PER_HOUR)
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#define MILLIS_PER_HOUR (MILLIS_PER_MINUTE * MINUTES_PER_HOUR)
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#define NANOS_PER_HOUR (NANOS_PER_MINUTE * MINUTES_PER_HOUR)
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/**
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* \brief Converts time in ns to a time string, with format similar to logcat.
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* \param ns input time in nanoseconds to convert.
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* \param buffer caller allocated string buffer, buffer_length must be >= 19 chars
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* in order to fully fit in time. The string is always returned
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* null terminated if buffer_size is greater than zero.
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* \param buffer_size size of buffer.
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*/
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static inline void audio_utils_ns_to_string(int64_t ns, char *buffer, size_t buffer_size)
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{
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if (buffer_size == 0) return;
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const int one_second = 1000000000;
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const time_t sec = ns / one_second;
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struct tm tm;
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// Supported on bionic, glibc, and macOS, but not mingw.
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if (localtime_r(&sec, &tm) == NULL) {
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buffer[0] = '\0';
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return;
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}
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if (snprintf(buffer, buffer_size, "%02d-%02d %02d:%02d:%02d.%03d",
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tm.tm_mon + 1, // localtime_r uses months in 0 - 11 range
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tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
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(int)(ns % one_second / 1000000)) < 0) {
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buffer[0] = '\0'; // null terminate on format error, which should not happen
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}
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}
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/**
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* An object that contains the formatted time string.
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*
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* The time string is 19 characters (including null termination).
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* Example: "03-27 16:47:06.187"
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* MM DD HH MM SS MS
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*/
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typedef struct audio_utils_time_string {
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char time[19]; /* minimum size buffer */
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} audio_utils_time_string_t;
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/**
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* \brief Converts time in ns to a time string object, with format similar to logcat.
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* \param ns input time in nanoseconds to convert.
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*/
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static inline audio_utils_time_string_t audio_utils_time_string_from_ns(int64_t ns)
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{
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audio_utils_time_string_t ts;
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audio_utils_ns_to_string(ns, ts.time, sizeof(ts.time));
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return ts;
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}
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/**
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* \brief Converts a timespec to nanoseconds.
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* \param ts input timespec to convert.
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* \return timespec converted to nanoseconds.
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*/
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static inline int64_t audio_utils_ns_from_timespec(const struct timespec *ts)
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{
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return ts->tv_sec * 1000000000LL + ts->tv_nsec;
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}
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/**
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* \brief Gets the real time clock in nanoseconds.
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* \return the real time clock in nanoseconds, or 0 on error.
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*/
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static inline int64_t audio_utils_get_real_time_ns() {
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#if defined(__linux__)
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struct timespec now_ts;
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if (clock_gettime(CLOCK_REALTIME, &now_ts) == 0) {
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return audio_utils_ns_from_timespec(&now_ts);
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}
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return 0; // should not happen.
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#else
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// Mac OS X compatible
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struct timeval now_tv;
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if (gettimeofday(&now_tv, NULL /* struct timezone * */) == 0) {
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return now_tv.tv_sec * 1000000000LL + now_tv.tv_usec * 1000LL;
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}
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return 0; // should not happen.
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#endif
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}
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#endif // !ANDROID_AUDIO_CLOCK_H
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