/usr/include/opal/codec/ratectl.h is in libopal-dev 3.10.2~dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ratectl.h
*
* Video rate controller
*
* Open Phone Abstraction Library (OPAL)
*
* Copyright (C) 2007 Matthias Schneider
* Copyright (C) 2008 Post Increment
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Open Phone Abstraction Library.
*
* The Initial Developer of the Original Code is Matthias Schneider
*
* Contributor(s): Post Increment
*
* $Revision: 22839 $
* $Author: rjongbloed $
* $Date: 2009-06-10 20:37:03 -0500 (Wed, 10 Jun 2009) $
*/
#ifndef OPAL_RATE_CONTROL_H
#define OPAL_RATE_CONTROL_H
#ifdef P_USE_PRAGMA
#pragma interface
#endif
#include <opal/buildopts.h>
#if OPAL_VIDEO
#include <rtp/rtp.h>
extern double OpalCalcSNR(const BYTE * src1, const BYTE * src2, PINDEX dataLen);
/** This class is used to calculate the instantaneous bit rate of a data stream
* using a one second sliding window
*/
class OpalBitRateCalculator
{
public:
/** Create the calculator
*/
OpalBitRateCalculator();
/** Reset the statistics
*/
void Reset();
/** Set the quanta (usually the frame time)
*/
void SetQuanta(
unsigned quanta_
);
/** Get the quanta (usually the frame time)
*/
unsigned GetQuanta() const
{ return m_quanta; }
/** Add a new packet to the bit rate calculations
*/
void AddPacket(PINDEX size, bool marker);
/** Get the instantaneous bit rate
*/
unsigned GetBitRate();
/** Get the average bit rate since SetQuanta was called
*/
unsigned GetAverageBitRate();
/** Get the average bit rate since SetQuanta was called
*/
unsigned GetAveragePacketSize();
/** return the bit rate if the specific data size was transmitted
*/
unsigned GetTrialBitRate(PINDEX size);
/** Return total bytes sent since SetQuanta was called
*/
PInt64 GetTotalSize() const;
/** Return total miliseconds since SetQuanta was called
*/
PInt64 GetTotalTime() const;
/** Return number of frames in history
*/
size_t GetHistoryCount() const
{ return m_history.size(); }
/** Return number of bytes in history
*/
unsigned GetHistorySize() const
{ return m_historySize; }
/** Return earlist timestamp in history
*/
PInt64 GetEarliestHistoryTime() const
{ if (m_history.size() == 0) return 0; return m_history.begin()->m_timeStamp; }
/** Return number of marker bits in history
*/
unsigned GetHistoryFrames() const;
// flush old data from history
void Flush();
// used to get "now"
static PInt64 GetNow();
protected:
void Flush(PInt64 now);
struct History {
History(PINDEX size_, PInt64 timeStamp_, bool marker_)
: m_size(size_), m_timeStamp(timeStamp_), m_marker(marker_)
{ }
PINDEX m_size;
PInt64 m_timeStamp;
bool m_marker;
};
std::deque<History> m_history;
PINDEX m_historySize;
PInt64 m_totalSize;
PINDEX m_historyFrames;
unsigned m_quanta;
unsigned m_bitRate;
bool m_first;
PInt64 m_baseTimeStamp;
};
//
// Declare a generic video rate controller class.
// A rate controller seeks to maintain a constant bit rate by manipulating
// the parameters of the video stream
//
// Before encoding a potential output frame, use the SkipFrame function to determine if the
// frame should be skipped.
//
// If the frame is not skipped, encode the frame and call PushFrame to add the frame to the rate controller queue
// PopFrame can then be called to retreive frames to transmit
//
// PushFrame must always be called with packets from a single video frame, but PopFrame may return packets
// from multiple video frames
//
class OpalMediaFormat;
class OpalVideoRateController
{
public:
OpalVideoRateController();
virtual ~OpalVideoRateController();
/** Open the rate controller with the specific parameters
*/
virtual void Open(
const OpalMediaFormat & mediaFormat
);
/** Determine if the next frame should be skipped.
* The rate controller can also indicate whether the next frame should
* be encoded as an I-frame, which is useful if many frames have been skipped
*/
virtual bool SkipFrame(
bool & forceIFrame
) = 0;
/** push encoded frames into the rate controller queue
*/
virtual void Push(
RTP_DataFrameList & inputFrames,
bool iFrame
);
/** retreive encoded frames from the rate controller queue
*/
virtual bool Pop(
RTP_DataFrameList & outputPackets,
bool & iFrame,
bool force
);
/** Bit rate calculator used by rate controller
*/
OpalBitRateCalculator m_bitRateCalc;
protected:
unsigned m_targetBitRate;
unsigned m_outputFrameTime;
PInt64 m_inputFrameCount;
PInt64 m_outputFrameCount;
struct PacketEntry {
PacketEntry(RTP_DataFrame * rtp_, bool iFrame_)
: m_rtp(rtp_), m_iFrame(iFrame_)
{ }
RTP_DataFrame * m_rtp;
bool m_iFrame;
};
std::deque<PacketEntry> m_packets;
};
namespace PWLibStupidLinkerHacks {
extern int rateControlKickerVal;
// static class RateControlKicker { public: RateControlKicker() { rateControlKickerVal = 1; } } rateControlKicker;
};
#endif // OPAL_VIDEO
#endif // OPAL_RATE_CONTROL_H
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