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/threads.h> 24 25 #include "LinearTransform.h" 26 27 namespace android { 28 29 class CommonClock { 30 public: 31 CommonClock(); 32 33 bool init(uint64_t local_freq); 34 35 status_t localToCommon(int64_t local, int64_t *common_out) const; 36 status_t commonToLocal(int64_t common, int64_t *local_out) const; 37 int64_t localDurationToCommonDuration(int64_t localDur) const; getCommonFreq()38 uint64_t getCommonFreq() const { return kCommonFreq; } isValid()39 bool isValid() const { return cur_trans_valid_; } 40 status_t setSlew(int64_t change_time, int32_t ppm); 41 void setBasis(int64_t local, int64_t common); 42 void resetBasis(); 43 private: 44 mutable Mutex lock_; 45 46 int32_t cur_slew_; 47 uint32_t local_to_common_freq_numer_; 48 uint32_t local_to_common_freq_denom_; 49 50 LinearTransform duration_trans_; 51 LinearTransform cur_trans_; 52 bool cur_trans_valid_; 53 54 static const uint64_t kCommonFreq = 1000000ull; 55 }; 56 57 } // namespace android 58 #endif // __COMMON_CLOCK_H__ 59