RTPAVProfilePayload32Sender Class Reference

#include <RTPAVProfilePayload32Sender.h>

Inheritance diagram for RTPAVProfilePayload32Sender:

List of all members.

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Detailed Description

An RTPAVProfilePayload32Sender is a module for sending data of payload type 32 in the rtp audio/video profile, which is mpeg video. This implementation doesn't send real mpeg data it just reads the gdf file created by Mpeg_Stat and sends rtp data packets which contain an RTPMpegPacket. The corresponding receiver module RTPAVProfilePayload32Receiver.

Protected Member Functions
virtual void	initialize ()
virtual void	initializeSenderModule (RTPInnerPacket *rinpIn)
virtual bool	sendPacket ()
Protected Attributes
double	_initialDelay
double	_framesPerSecond
double	_frameNumber

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Member Function Documentation

void RTPAVProfilePayload32Sender::initialize (   )  [protected, virtual]

Initializes the module. It sets the values for clock rate and payload type. Reimplemented from RTPPayloadSender. { RTPPayloadSender::initialize(); _clockRate = 90000; _payloadType = 32; };

void RTPAVProfilePayload32Sender::initializeSenderModule (  RTPInnerPacket *  rinpIn  )  [protected, virtual]

This method reads the gdf file header. Reimplemented from RTPPayloadSender. { char line[100]; char unit[100]; char description[100]; RTPPayloadSender::initializeSenderModule(rinpIn); // first line: fps unit description _inputFileStream.get(line, 100, '\n'); float fps; sscanf(line, "%f %s %s", &fps, unit, description); _framesPerSecond = fps; _frameNumber = 0; // get new line character char c; _inputFileStream.get(c); // second line: initial delay unit description _inputFileStream.get(line, 100, '\n'); float delay; sscanf(line, "%f %s %s", &delay, unit, description); _initialDelay = delay; // wait initial delay // cMessage *reminderMessage = new cMessage("next frame"); // scheduleAt(simTime() + _initialDelay, reminderMessage); };

bool RTPAVProfilePayload32Sender::sendPacket (   )  [protected, virtual]

This method sends one mpeg frame. It sends one or more rtp data packet. Returns false if there were no more frames. Reimplemented from RTPPayloadSender. { // read next frame line int bits; char unit[100]; char description[100]; _inputFileStream >> bits; _inputFileStream >> unit; _inputFileStream.get(description, 100, '\n'); int pictureType = 0; if (strchr(description, 'I')) { pictureType = 1; } else if (strchr(description, 'P')) { pictureType = 2; } else if (strchr(description, 'B')) { pictureType = 3; } else if (strchr(description, 'D')) { pictureType = 4; }; int bytesRemaining = bits / 8; if (!_inputFileStream.eof()) { while (bytesRemaining > 0) { RTPPacket *rtpPacket = new RTPPacket("RTPPacket"); RTPMpegPacket *mpegPacket = new RTPMpegPacket("MpegPacket"); // the only mpeg information we know is the picture type mpegPacket->setPictureType(pictureType); // the maximum number of real data bytes int maxDataSize = _mtu - rtpPacket->length() - mpegPacket->length(); if (bytesRemaining > maxDataSize) { // we do not know where slices in the // mpeg picture begin // so we simulate by assuming a slice // has a length of 64 bytes int slicedDataSize = (maxDataSize / 64) * 64; mpegPacket->addLength(slicedDataSize); rtpPacket->encapsulate(mpegPacket); bytesRemaining = bytesRemaining - slicedDataSize; } else { mpegPacket->addLength(bytesRemaining); rtpPacket->encapsulate(mpegPacket); // set marker because this is // the last packet of the frame rtpPacket->setMarker(1); bytesRemaining = 0; } rtpPacket->setPayloadType(_payloadType); rtpPacket->setSequenceNumber(_sequenceNumber); _sequenceNumber++; rtpPacket->setTimeStamp(_timeStampBase + (_initialDelay + (1 / _framesPerSecond) * (double)_frameNumber) * _clockRate); rtpPacket->setSSRC(_ssrc); RTPInnerPacket *rinpOut = new RTPInnerPacket("dataOut()"); rinpOut->dataOut(rtpPacket); send(rinpOut, "toProfile"); }; _frameNumber++; _reminderMessage = new cMessage("nextFrame"); scheduleAt(simTime() + 1.0 / _framesPerSecond, _reminderMessage); return true; } else { return false; } }

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Member Data Documentation

double RTPAVProfilePayload32Sender::_frameNumber [protected]

The number of the current mpeg frame. Needed for calculating the rtp time stamp in the rtp data packets.

double RTPAVProfilePayload32Sender::_framesPerSecond [protected]

The number of frames per second of the mpeg video.

double RTPAVProfilePayload32Sender::_initialDelay [protected]

The initial delay of the mpeg video.

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The documentation for this class was generated from the following files:

• RTPAVProfilePayload32Sender.h
• RTPAVProfilePayload32Sender.cc

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