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/*
* udp_buffer.h: Ring buffer for UDP/RTP streams
*
* See the main source file 'xineliboutput.c' for copyright information and
* how to reach the author.
*
* $Id: udp_buffer.h,v 1.1 2006-06-03 10:04:28 phintuka Exp $
*
*/
#ifndef __UDP_BUFFER_H
#define __UDP_BUFFER_H
#include <stdint.h>
#include "../xine_input_vdr_net.h" // frame headers
#define UDP_BUFFER_SIZE 0x100 // 2^n
#define UDP_BUFFER_MASK 0xff // 2^n - 1
#if UDP_BUFFER_MASK != UDP_SEQ_MASK
# error Buffer handling error !!!
#endif
class cUdpBackLog
{
friend class cUdpScheduler;
private:
cUdpBackLog(cUdpBackLog&);
stream_udp_header_t *m_UdpBuffer[UDP_BUFFER_SIZE];
int m_UdpBufLen[UDP_BUFFER_SIZE]; /* size of allocated memory, not frame */
int m_PayloadSize[UDP_BUFFER_SIZE]; /* size of frame */
unsigned int m_SeqNo; /* next (outgoing) sequence number */
protected:
cUdpBackLog()
{
memset(m_UdpBuffer, 0, sizeof(stream_udp_header_t *)*UDP_BUFFER_SIZE);
memset(m_UdpBufLen, 0, sizeof(int) * UDP_BUFFER_SIZE);
memset(m_PayloadSize, 0, sizeof(int) * UDP_BUFFER_SIZE);
m_SeqNo = 0;
}
void Clear(int HowManyFrames)
{
// Clear n last frames from buffer.
// (called to adjust sequence numbering when some
// already allocated frames won't be sent)
//
// Note: Nothing is freed.
// To completely reset buffer it must be deleted and re-created.
//
m_SeqNo = (m_SeqNo + UDP_BUFFER_SIZE - HowManyFrames) & UDP_BUFFER_MASK;
}
virtual ~cUdpBackLog()
{
for(int i=0; i<UDP_BUFFER_SIZE; i++)
if(m_UdpBuffer[i]) {
//m_UdpBufLen[i] = 0;
DELETENULL(m_UdpBuffer[i]);
}
}
stream_udp_header_t *Get(int UdpSeqNo)
{
int BufIndex = UdpSeqNo & UDP_BUFFER_MASK;
return m_UdpBuffer[BufIndex];
}
int PayloadSize(int UdpSeqNo)
{
int BufIndex = UdpSeqNo & UDP_BUFFER_MASK;
return m_UdpBuffer[BufIndex] ? m_PayloadSize[BufIndex] : 0;
}
stream_udp_header_t *MakeFrame(uint64_t StreamPos,
const uchar *Data, int DataLen)
{
int UdpPacketLen = DataLen + sizeof(stream_udp_header_t);
int BufIndex = m_SeqNo & UDP_BUFFER_MASK;
// old buffer too small ? free it
if(m_UdpBuffer[BufIndex] && m_UdpBufLen[BufIndex] < UdpPacketLen)
DELETENULL(m_UdpBuffer[BufIndex]);
// no buffer ? alloc it
if(!m_UdpBuffer[BufIndex]) {
m_UdpBuffer[BufIndex] = (stream_udp_header_t*)new uchar[UdpPacketLen];
m_UdpBufLen[BufIndex] = UdpPacketLen;
}
m_PayloadSize[BufIndex] = DataLen;
// Fill frame to buffer
stream_udp_header_t *header = m_UdpBuffer[BufIndex];
uchar *Payload = UDP_PAYLOAD(header);
memcpy(Payload, Data, DataLen);
header->pos = htonll(StreamPos);
header->seq = htons(m_SeqNo);
m_SeqNo = (m_SeqNo + 1) & UDP_SEQ_MASK;
return header;
}
};
#endif
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