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 MODULES_VIDEO_CODING_CODEC_TIMER_H_ 12 #define MODULES_VIDEO_CODING_CODEC_TIMER_H_ 13 14 #include <queue> 15 16 #include "rtc_base/numerics/percentile_filter.h" 17 18 namespace webrtc { 19 20 class VCMCodecTimer { 21 public: 22 VCMCodecTimer(); 23 ~VCMCodecTimer(); 24 25 // Add a new decode time to the filter. 26 void AddTiming(int64_t new_decode_time_ms, int64_t now_ms); 27 28 // Get the required decode time in ms. It is the 95th percentile observed 29 // decode time within a time window. 30 int64_t RequiredDecodeTimeMs() const; 31 32 private: 33 struct Sample { 34 Sample(int64_t decode_time_ms, int64_t sample_time_ms); 35 int64_t decode_time_ms; 36 int64_t sample_time_ms; 37 }; 38 39 // The number of samples ignored so far. 40 int ignored_sample_count_; 41 // Queue with history of latest decode time values. 42 std::queue<Sample> history_; 43 // |filter_| contains the same values as |history_|, but in a data structure 44 // that allows efficient retrieval of the percentile value. 45 PercentileFilter<int64_t> filter_; 46 }; 47 48 } // namespace webrtc 49 50 #endif // MODULES_VIDEO_CODING_CODEC_TIMER_H_ 51