1/*
2 * Copyright (C) 2015 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 MEDIA_CLOCK_H_
18
19#define MEDIA_CLOCK_H_
20
21#include <media/stagefright/foundation/ABase.h>
22#include <utils/Mutex.h>
23#include <utils/RefBase.h>
24
25namespace android {
26
27struct AMessage;
28
29struct MediaClock : public RefBase {
30    MediaClock();
31
32    void setStartingTimeMedia(int64_t startingTimeMediaUs);
33
34    void clearAnchor();
35    // It's required to use timestamp of just rendered frame as
36    // anchor time in paused state.
37    void updateAnchor(
38            int64_t anchorTimeMediaUs,
39            int64_t anchorTimeRealUs,
40            int64_t maxTimeMediaUs = INT64_MAX);
41
42    void updateMaxTimeMedia(int64_t maxTimeMediaUs);
43
44    void setPlaybackRate(float rate);
45    float getPlaybackRate() const;
46
47    // query media time corresponding to real time |realUs|, and save the
48    // result in |outMediaUs|.
49    status_t getMediaTime(
50            int64_t realUs,
51            int64_t *outMediaUs,
52            bool allowPastMaxTime = false) const;
53    // query real time corresponding to media time |targetMediaUs|.
54    // The result is saved in |outRealUs|.
55    status_t getRealTimeFor(int64_t targetMediaUs, int64_t *outRealUs) const;
56
57protected:
58    virtual ~MediaClock();
59
60private:
61    status_t getMediaTime_l(
62            int64_t realUs,
63            int64_t *outMediaUs,
64            bool allowPastMaxTime) const;
65
66    mutable Mutex mLock;
67
68    int64_t mAnchorTimeMediaUs;
69    int64_t mAnchorTimeRealUs;
70    int64_t mMaxTimeMediaUs;
71    int64_t mStartingTimeMediaUs;
72
73    float mPlaybackRate;
74
75    DISALLOW_EVIL_CONSTRUCTORS(MediaClock);
76};
77
78}  // namespace android
79
80#endif  // MEDIA_CLOCK_H_
81