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/*
* Oreka -- A media capture and retrieval platform
*
* Copyright (C) 2005, orecx LLC
*
* http://www.orecx.com
*
* This program is free software, distributed under the terms of
* the GNU General Public License.
* Please refer to http://www.gnu.org/copyleft/gpl.html
*
*/
#ifndef __RTP_H__
#define __RTP_H__
#include "AudioCapture.h"
#include "boost/shared_ptr.hpp"
#include "StdString.h"
#include "LogManager.h"
#define NUM_SAMPLES_CIRCULAR_BUFFER 8000
#define NUM_SAMPLES_TRIGGER 4000 // when we have this number of available samples make a shipment
#define NUM_SAMPLES_SHIPMENT_HOLDOFF 2000 // when shipping, ship everything but this number of samples
// useful info we extract from an RTP packet
class RtpPacketInfo
{
public:
void ToString(CStdString& string);
//CStdString m_sourceMac;
//CStdString m_destMac;
struct in_addr m_sourceIp;
struct in_addr m_destIp;
unsigned short m_sourcePort;
unsigned short m_destPort;
unsigned int m_payloadSize;
unsigned short m_payloadType;
unsigned char* m_payload;
unsigned short m_seqNum;
unsigned int m_timestamp;
time_t m_arrivalTimestamp;
};
typedef boost::shared_ptr<RtpPacketInfo> RtpPacketInfoRef;
// Ring buffer based on RTP timestamps
// Gathers both sides of the conversation and mixes them into single channel
// Robust to silence suppression
// Supports RTP buffers of arbitrary sizes in both directions.
class RtpRingBuffer
{
public:
RtpRingBuffer();
void AddRtpPacket(RtpPacketInfoRef&);
void SetCapturePort(CStdString& port);
private:
void StoreRtpPacket(RtpPacketInfoRef&);
void CreateShipment(size_t silenceSize);
unsigned int FreeSpace();
unsigned int UsedSpace();
short* GetHoldOffPtr();
short* CircularPointerAddOffset(short *ptr, size_t offset);
short* CicularPointerSubtractOffset(short *ptr, size_t offset);
short* m_writePtr; // pointer after newest RTP data we've received
short* m_readPtr; // where to read from next
unsigned int m_readTimestamp; // timestamp that the next shipment will have
unsigned int m_writeTimestamp; // timestamp that the next RTP buffer should have
short* m_bufferEnd;
short m_buffer[NUM_SAMPLES_CIRCULAR_BUFFER];
CStdString m_capturePort;
LoggerPtr m_log;
unsigned int m_shippedSamples;
};
#endif
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