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/*
* 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.
*/
#include "modules/video_coding/codec_timer.h"
namespace webrtc {
namespace {
// The first kIgnoredSampleCount samples will be ignored.
const int kIgnoredSampleCount = 5;
// Return the |kPercentile| value in RequiredDecodeTimeMs().
const float kPercentile = 0.95f;
// The window size in ms.
const int64_t kTimeLimitMs = 10000;
} // anonymous namespace
VCMCodecTimer::VCMCodecTimer()
: ignored_sample_count_(0), filter_(kPercentile) {}
void VCMCodecTimer::AddTiming(int64_t decode_time_ms, int64_t now_ms) {
// Ignore the first |kIgnoredSampleCount| samples.
if (ignored_sample_count_ < kIgnoredSampleCount) {
++ignored_sample_count_;
return;
}
// Insert new decode time value.
filter_.Insert(decode_time_ms);
history_.emplace(decode_time_ms, now_ms);
// Pop old decode time values.
while (!history_.empty() &&
now_ms - history_.front().sample_time_ms > kTimeLimitMs) {
filter_.Erase(history_.front().decode_time_ms);
history_.pop();
}
}
// Get the 95th percentile observed decode time within a time window.
int64_t VCMCodecTimer::RequiredDecodeTimeMs() const {
return filter_.GetPercentileValue();
}
VCMCodecTimer::Sample::Sample(int64_t decode_time_ms, int64_t sample_time_ms)
: decode_time_ms(decode_time_ms), sample_time_ms(sample_time_ms) {}
} // namespace webrtc
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