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 FRAME_DROPPER_H_
18
19#define FRAME_DROPPER_H_
20
21#include <utils/Errors.h>
22#include <utils/RefBase.h>
23
24#include <media/stagefright/foundation/ABase.h>
25
26namespace android {
27
28struct FrameDropper : public RefBase {
29    // No frames will be dropped until a valid max frame rate is set.
30    FrameDropper();
31
32    // maxFrameRate required to be positive.
33    status_t setMaxFrameRate(float maxFrameRate);
34
35    // Returns false if max frame rate has not been set via setMaxFrameRate.
36    bool shouldDrop(int64_t timeUs);
37
38protected:
39    virtual ~FrameDropper();
40
41private:
42    int64_t mDesiredMinTimeUs;
43    int64_t mMinIntervalUs;
44
45    DISALLOW_EVIL_CONSTRUCTORS(FrameDropper);
46};
47
48}  // namespace android
49
50#endif  // FRAME_DROPPER_H_
51