1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
12#define WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
13
14#include "webrtc/modules/interface/module_common_types.h"
15#include "webrtc/typedefs.h"
16
17namespace webrtc
18{
19
20// MAX_HISTORY_SIZE * SHORT_FILTER_MS defines the window size in milliseconds
21#define MAX_HISTORY_SIZE 10
22#define SHORT_FILTER_MS 1000
23
24class VCMShortMaxSample
25{
26public:
27    VCMShortMaxSample() : shortMax(0), timeMs(-1) {};
28
29    int32_t     shortMax;
30    int64_t     timeMs;
31};
32
33class VCMCodecTimer
34{
35public:
36    VCMCodecTimer();
37
38    // Updates and returns the max filtered decode time.
39    int32_t StopTimer(int64_t startTimeMs, int64_t nowMs);
40
41    // Empty the list of timers.
42    void Reset();
43
44    // Get the required decode time in ms.
45    int32_t RequiredDecodeTimeMs(FrameType frameType) const;
46
47private:
48    void UpdateMaxHistory(int32_t decodeTime, int64_t now);
49    void MaxFilter(int32_t newTime, int64_t nowMs);
50    void ProcessHistory(int64_t nowMs);
51
52    int32_t                     _filteredMax;
53    // The number of samples ignored so far.
54    int32_t                     _ignoredSampleCount;
55    int32_t                     _shortMax;
56    VCMShortMaxSample           _history[MAX_HISTORY_SIZE];
57
58};
59
60}  // namespace webrtc
61
62#endif // WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
63