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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 "webrtc/modules/video_coding/main/source/codec_timer.h"
#include <assert.h>
namespace webrtc
{
// The first kIgnoredSampleCount samples will be ignored.
static const int32_t kIgnoredSampleCount = 5;
VCMCodecTimer::VCMCodecTimer()
:
_filteredMax(0),
_ignoredSampleCount(0),
_shortMax(0),
_history()
{
Reset();
}
int32_t VCMCodecTimer::StopTimer(int64_t startTimeMs, int64_t nowMs)
{
const int32_t timeDiff = static_cast<int32_t>(nowMs - startTimeMs);
MaxFilter(timeDiff, nowMs);
return timeDiff;
}
void VCMCodecTimer::Reset()
{
_filteredMax = 0;
_ignoredSampleCount = 0;
_shortMax = 0;
for (int i=0; i < MAX_HISTORY_SIZE; i++)
{
_history[i].shortMax = 0;
_history[i].timeMs = -1;
}
}
// Update the max-value filter
void VCMCodecTimer::MaxFilter(int32_t decodeTime, int64_t nowMs)
{
if (_ignoredSampleCount >= kIgnoredSampleCount)
{
UpdateMaxHistory(decodeTime, nowMs);
ProcessHistory(nowMs);
}
else
{
_ignoredSampleCount++;
}
}
void
VCMCodecTimer::UpdateMaxHistory(int32_t decodeTime, int64_t now)
{
if (_history[0].timeMs >= 0 &&
now - _history[0].timeMs < SHORT_FILTER_MS)
{
if (decodeTime > _shortMax)
{
_shortMax = decodeTime;
}
}
else
{
// Only add a new value to the history once a second
if(_history[0].timeMs == -1)
{
// First, no shift
_shortMax = decodeTime;
}
else
{
// Shift
for(int i = (MAX_HISTORY_SIZE - 2); i >= 0 ; i--)
{
_history[i+1].shortMax = _history[i].shortMax;
_history[i+1].timeMs = _history[i].timeMs;
}
}
if (_shortMax == 0)
{
_shortMax = decodeTime;
}
_history[0].shortMax = _shortMax;
_history[0].timeMs = now;
_shortMax = 0;
}
}
void
VCMCodecTimer::ProcessHistory(int64_t nowMs)
{
_filteredMax = _shortMax;
if (_history[0].timeMs == -1)
{
return;
}
for (int i=0; i < MAX_HISTORY_SIZE; i++)
{
if (_history[i].timeMs == -1)
{
break;
}
if (nowMs - _history[i].timeMs > MAX_HISTORY_SIZE * SHORT_FILTER_MS)
{
// This sample (and all samples after this) is too old
break;
}
if (_history[i].shortMax > _filteredMax)
{
// This sample is the largest one this far into the history
_filteredMax = _history[i].shortMax;
}
}
}
// Get the maximum observed time within a time window
int32_t VCMCodecTimer::RequiredDecodeTimeMs(FrameType /*frameType*/) const
{
return _filteredMax;
}
}
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