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/*
* Copyright (C) 2012 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 __COMMON_CLOCK_H__
#define __COMMON_CLOCK_H__
#include <stdint.h>
#include <utils/Errors.h>
#include <utils/LinearTransform.h>
#include <utils/threads.h>
namespace android {
class CommonClock {
public:
CommonClock();
bool init(uint64_t local_freq);
status_t localToCommon(int64_t local, int64_t *common_out) const;
status_t commonToLocal(int64_t common, int64_t *local_out) const;
int64_t localDurationToCommonDuration(int64_t localDur) const;
uint64_t getCommonFreq() const { return kCommonFreq; }
bool isValid() const { return cur_trans_valid_; }
status_t setSlew(int64_t change_time, int32_t ppm);
void setBasis(int64_t local, int64_t common);
void resetBasis();
private:
mutable Mutex lock_;
int32_t cur_slew_;
uint32_t local_to_common_freq_numer_;
uint32_t local_to_common_freq_denom_;
LinearTransform duration_trans_;
LinearTransform cur_trans_;
bool cur_trans_valid_;
static const uint64_t kCommonFreq = 1000000ull;
};
} // namespace android
#endif // __COMMON_CLOCK_H__
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