| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef MODULES_VIDEO_CODING_TIMING_DECODE_TIME_PERCENTILE_FILTER_H_ |
| #define MODULES_VIDEO_CODING_TIMING_DECODE_TIME_PERCENTILE_FILTER_H_ |
| |
| #include <queue> |
| |
| #include "rtc_base/numerics/percentile_filter.h" |
| |
| namespace webrtc { |
| |
| // The `DecodeTimePercentileFilter` filters the actual per-frame decode times |
| // and provides an estimate for the 95th percentile of those decode times. This |
| // estimate can be used to determine how large the "decode delay term" should be |
| // when determining the render timestamp for a frame. |
| class DecodeTimePercentileFilter { |
| public: |
| DecodeTimePercentileFilter(); |
| ~DecodeTimePercentileFilter(); |
| |
| // Add a new decode time to the filter. |
| void AddTiming(int64_t new_decode_time_ms, int64_t now_ms); |
| |
| // Get the required decode time in ms. It is the 95th percentile observed |
| // decode time within a time window. |
| int64_t RequiredDecodeTimeMs() const; |
| |
| private: |
| struct Sample { |
| Sample(int64_t decode_time_ms, int64_t sample_time_ms); |
| int64_t decode_time_ms; |
| int64_t sample_time_ms; |
| }; |
| |
| // The number of samples ignored so far. |
| int ignored_sample_count_; |
| // Queue with history of latest decode time values. |
| std::queue<Sample> history_; |
| // `filter_` contains the same values as `history_`, but in a data structure |
| // that allows efficient retrieval of the percentile value. |
| PercentileFilter<int64_t> filter_; |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // MODULES_VIDEO_CODING_TIMING_DECODE_TIME_PERCENTILE_FILTER_H_ |