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| 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 #include "webrtc/modules/video_coding/main/source/codec_timer.h" | |
| 12 | |
| 13 #include <assert.h> | |
| 14 | |
| 15 namespace webrtc | |
| 16 { | |
| 17 | |
| 18 // The first kIgnoredSampleCount samples will be ignored. | |
| 19 static const int32_t kIgnoredSampleCount = 5; | |
| 20 | |
| 21 VCMCodecTimer::VCMCodecTimer() | |
| 22 : | |
| 23 _filteredMax(0), | |
| 24 _ignoredSampleCount(0), | |
| 25 _shortMax(0), | |
| 26 _history() | |
| 27 { | |
| 28 Reset(); | |
| 29 } | |
| 30 | |
| 31 void VCMCodecTimer::Reset() | |
| 32 { | |
| 33 _filteredMax = 0; | |
| 34 _ignoredSampleCount = 0; | |
| 35 _shortMax = 0; | |
| 36 for (int i=0; i < MAX_HISTORY_SIZE; i++) | |
| 37 { | |
| 38 _history[i].shortMax = 0; | |
| 39 _history[i].timeMs = -1; | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 // Update the max-value filter | |
| 44 void VCMCodecTimer::MaxFilter(int32_t decodeTime, int64_t nowMs) | |
| 45 { | |
| 46 if (_ignoredSampleCount >= kIgnoredSampleCount) | |
| 47 { | |
| 48 UpdateMaxHistory(decodeTime, nowMs); | |
| 49 ProcessHistory(nowMs); | |
| 50 } | |
| 51 else | |
| 52 { | |
| 53 _ignoredSampleCount++; | |
| 54 } | |
| 55 } | |
| 56 | |
| 57 void | |
| 58 VCMCodecTimer::UpdateMaxHistory(int32_t decodeTime, int64_t now) | |
| 59 { | |
| 60 if (_history[0].timeMs >= 0 && | |
| 61 now - _history[0].timeMs < SHORT_FILTER_MS) | |
| 62 { | |
| 63 if (decodeTime > _shortMax) | |
| 64 { | |
| 65 _shortMax = decodeTime; | |
| 66 } | |
| 67 } | |
| 68 else | |
| 69 { | |
| 70 // Only add a new value to the history once a second | |
| 71 if(_history[0].timeMs == -1) | |
| 72 { | |
| 73 // First, no shift | |
| 74 _shortMax = decodeTime; | |
| 75 } | |
| 76 else | |
| 77 { | |
| 78 // Shift | |
| 79 for(int i = (MAX_HISTORY_SIZE - 2); i >= 0 ; i--) | |
| 80 { | |
| 81 _history[i+1].shortMax = _history[i].shortMax; | |
| 82 _history[i+1].timeMs = _history[i].timeMs; | |
| 83 } | |
| 84 } | |
| 85 if (_shortMax == 0) | |
| 86 { | |
| 87 _shortMax = decodeTime; | |
| 88 } | |
| 89 | |
| 90 _history[0].shortMax = _shortMax; | |
| 91 _history[0].timeMs = now; | |
| 92 _shortMax = 0; | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 void | |
| 97 VCMCodecTimer::ProcessHistory(int64_t nowMs) | |
| 98 { | |
| 99 _filteredMax = _shortMax; | |
| 100 if (_history[0].timeMs == -1) | |
| 101 { | |
| 102 return; | |
| 103 } | |
| 104 for (int i=0; i < MAX_HISTORY_SIZE; i++) | |
| 105 { | |
| 106 if (_history[i].timeMs == -1) | |
| 107 { | |
| 108 break; | |
| 109 } | |
| 110 if (nowMs - _history[i].timeMs > MAX_HISTORY_SIZE * SHORT_FILTER_MS) | |
| 111 { | |
| 112 // This sample (and all samples after this) is too old | |
| 113 break; | |
| 114 } | |
| 115 if (_history[i].shortMax > _filteredMax) | |
| 116 { | |
| 117 // This sample is the largest one this far into the history | |
| 118 _filteredMax = _history[i].shortMax; | |
| 119 } | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 // Get the maximum observed time within a time window | |
| 124 int32_t VCMCodecTimer::RequiredDecodeTimeMs(FrameType /*frameType*/) const | |
| 125 { | |
| 126 return _filteredMax; | |
| 127 } | |
| 128 | |
| 129 } | |
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Chromium Code Reviews
Issue 1417283007:
modules/video_coding refactorings (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master