60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/video_coding/codec_timer.h"
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#include <cstdint>
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namespace webrtc {
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namespace {
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// The first kIgnoredSampleCount samples will be ignored.
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const int kIgnoredSampleCount = 5;
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// Return the |kPercentile| value in RequiredDecodeTimeMs().
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const float kPercentile = 0.95f;
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// The window size in ms.
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const int64_t kTimeLimitMs = 10000;
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} // anonymous namespace
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VCMCodecTimer::VCMCodecTimer()
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: ignored_sample_count_(0), filter_(kPercentile) {}
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VCMCodecTimer::~VCMCodecTimer() = default;
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void VCMCodecTimer::AddTiming(int64_t decode_time_ms, int64_t now_ms) {
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// Ignore the first |kIgnoredSampleCount| samples.
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if (ignored_sample_count_ < kIgnoredSampleCount) {
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++ignored_sample_count_;
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return;
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}
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// Insert new decode time value.
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filter_.Insert(decode_time_ms);
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history_.emplace(decode_time_ms, now_ms);
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// Pop old decode time values.
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while (!history_.empty() &&
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now_ms - history_.front().sample_time_ms > kTimeLimitMs) {
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filter_.Erase(history_.front().decode_time_ms);
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history_.pop();
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}
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}
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// Get the 95th percentile observed decode time within a time window.
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int64_t VCMCodecTimer::RequiredDecodeTimeMs() const {
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return filter_.GetPercentileValue();
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}
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VCMCodecTimer::Sample::Sample(int64_t decode_time_ms, int64_t sample_time_ms)
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: decode_time_ms(decode_time_ms), sample_time_ms(sample_time_ms) {}
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} // namespace webrtc
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