common_clock.h revision 9158825f9c41869689d6b1786d7c7aa8bdd524ce 
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
26namespace android {
27
28class 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;
37    uint64_t  getCommonFreq() const { return kCommonFreq; }
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