134 lines
3.0 KiB
C++
134 lines
3.0 KiB
C++
/*
|
|
* 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 "codec_timer.h"
|
|
|
|
#include <assert.h>
|
|
|
|
namespace webrtc
|
|
{
|
|
|
|
VCMCodecTimer::VCMCodecTimer()
|
|
:
|
|
_filteredMax(0),
|
|
_firstDecodeTime(true),
|
|
_shortMax(0),
|
|
_history()
|
|
{
|
|
Reset();
|
|
}
|
|
|
|
WebRtc_Word32 VCMCodecTimer::StopTimer(WebRtc_Word64 startTimeMs, WebRtc_Word64 nowMs)
|
|
{
|
|
const WebRtc_Word32 timeDiff = static_cast<WebRtc_Word32>(nowMs - startTimeMs);
|
|
MaxFilter(timeDiff, nowMs);
|
|
return timeDiff;
|
|
}
|
|
|
|
void VCMCodecTimer::Reset()
|
|
{
|
|
_filteredMax = 0;
|
|
_firstDecodeTime = true;
|
|
_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(WebRtc_Word32 decodeTime, WebRtc_Word64 nowMs)
|
|
{
|
|
if (!_firstDecodeTime)
|
|
{
|
|
UpdateMaxHistory(decodeTime, nowMs);
|
|
ProcessHistory(nowMs);
|
|
}
|
|
else
|
|
{
|
|
_firstDecodeTime = false;
|
|
}
|
|
}
|
|
|
|
void
|
|
VCMCodecTimer::UpdateMaxHistory(WebRtc_Word32 decodeTime, WebRtc_Word64 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(WebRtc_Word64 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
|
|
WebRtc_Word32 VCMCodecTimer::RequiredDecodeTimeMs(FrameType /*frameType*/) const
|
|
{
|
|
return _filteredMax;
|
|
}
|
|
|
|
}
|