1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __COMMON_CLOCK_H__ 18 #define __COMMON_CLOCK_H__ 19 20 #include <stdint.h> 21 22 #include <utils/Errors.h> 23 #include <utils/LinearTransform.h> 24 #include <utils/threads.h> 25 26 namespace android { 27 28 class CommonClock { 29 public: 30 CommonClock(); 31 32 bool init(uint64_t local_freq); 33 34 status_t localToCommon(int64_t local, int64_t *common_out) const; 35 status_t commonToLocal(int64_t common, int64_t *local_out) const; 36 int64_t localDurationToCommonDuration(int64_t localDur) const; getCommonFreq()37 uint64_t getCommonFreq() const { return kCommonFreq; } isValid()38 bool isValid() const { return cur_trans_valid_; } 39 status_t setSlew(int64_t change_time, int32_t ppm); 40 void setBasis(int64_t local, int64_t common); 41 void resetBasis(); 42 private: 43 mutable Mutex lock_; 44 45 int32_t cur_slew_; 46 uint32_t local_to_common_freq_numer_; 47 uint32_t local_to_common_freq_denom_; 48 49 LinearTransform duration_trans_; 50 LinearTransform cur_trans_; 51 bool cur_trans_valid_; 52 53 static const uint64_t kCommonFreq = 1000000ull; 54 }; 55 56 } // namespace android 57 #endif // __COMMON_CLOCK_H__ 58