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/*
* ts2pkt.cpp: A plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id$
*/
#include "ts2pkt.h"
cMarkAdTS2Pkt::cMarkAdTS2Pkt(int RecvNumber)
{
recvnumber=RecvNumber;
pktdata=NULL;
pktdatalast=NULL;
Reset();
}
cMarkAdTS2Pkt::~cMarkAdTS2Pkt()
{
if (pktdata) free(pktdata);
if (pktdatalast) free(pktdatalast);
}
void cMarkAdTS2Pkt::Reset(int ErrIndex)
{
switch (ErrIndex)
{
case MA_ERR_TOSMALL:
dsyslog("markad [%i]: input to small",recvnumber);
break;
case MA_ERR_NOSYNC:
dsyslog("markad [%i]: found no sync",recvnumber);
break;
case MA_ERR_SEQ:
dsyslog("markad [%i]: sequence error",recvnumber);
break;
case MA_ERR_AFC:
dsyslog("markad [%i]: wrong AFC value",recvnumber);
break;
case MA_ERR_TOBIG:
dsyslog("markad [%i]: buflen > 188",recvnumber);
break;
case MA_ERR_NEG:
dsyslog("markad [%i]: buflen < 0",recvnumber);
break;
case MA_ERR_MEM:
dsyslog("markad [%i]: out of memory",recvnumber);
break;
}
if (pktdata) free(pktdata);
pktdata=NULL;
pktsize=0;
dataleft=false;
counter=-1;
pktinfo.pkthdr=-1;
isPES=false;
}
bool cMarkAdTS2Pkt::CheckStreamID(MarkAdPid Pid, uchar *Data, int Size)
{
if ((!Data) || (!Size)) return false;
if (Size<3) return false;
int streamid=Data[3];
switch (Pid.Type)
{
case MARKAD_PIDTYPE_AUDIO_AC3:
if (streamid!=0xBD) return false;
return true;
break;
case MARKAD_PIDTYPE_AUDIO_MP2:
if ((streamid & 0xF0)!=0xC0) return false;
return true;
break;
case MARKAD_PIDTYPE_VIDEO_H262:
case MARKAD_PIDTYPE_VIDEO_H264:
if ((streamid>=0xBC) && (streamid<0xE0)) return false;
if (streamid>0xEF) return false;
return true;
break;
default:
return false;
}
return false;
}
int cMarkAdTS2Pkt::FindPktHeader(uchar *Data, int Size, int *StreamSize,
int *HeaderSize)
{
#define PESHDRSIZE 6
if ((!Data) || (!Size)) return -1;
if (StreamSize) (*StreamSize)=0;
if (HeaderSize) (*HeaderSize)=3;
unsigned long scanner=0xFFFFFFFF;
int i;
for (i=0; i<Size; i++)
{
scanner<<=8;
if (scanner==0x00000100L)
{
break;
}
scanner|=Data[i];
}
if (i!=Size)
{
if ((StreamSize) && ((i+2)<Size))
{
if (Data[i]>=0xBC) // do we have a PES packet?
{
(*StreamSize)=(Data[i+1]<<8)+Data[i+2];
if (*StreamSize) (*StreamSize)+=PESHDRSIZE; // 6 Byte PES-Header
if ((HeaderSize) && ((i+PESHDRSIZE)<Size))
{
struct PESHDROPT *peshdropt=(struct PESHDROPT *) &Data[i+3];
if (peshdropt->MarkerBits==0x2)
{
(*HeaderSize)=PESHDRSIZE+sizeof(struct PESHDROPT)+
peshdropt->Length;
}
else
{
(*HeaderSize)=PESHDRSIZE;
}
}
}
}
return i-3;
}
return -1;
}
int cMarkAdTS2Pkt::Process(MarkAdPid Pid, uchar *TSData, int TSSize, uchar **PktData, int *PktSize)
{
if ((!PktData) || (!PktSize) || (!TSData) || (!TSSize)) return -1;
*PktData=NULL;
*PktSize=0;
int buflen=TS_SIZE+1;
uchar *buf=NULL;
int bytes_processed; // pointer in TSData
if (!dataleft)
{
if (TSSize<TS_SIZE)
{
Reset(MA_ERR_TOSMALL);
return TSSize; // we need a full packet
}
if ((TSData[0]==0) && (TSData[1]==0) && (TSData[2]==1))
{
isPES=true;
}
if (isPES)
{
buf=TSData;
buflen=TSSize;
}
else
{
// search for TS packet sync
int i;
for (i=0; i<TSSize; i++)
{
if (TSData[i]==0x47) break;
}
if (i==TSSize)
{
Reset(MA_ERR_NOSYNC);
return TSSize;
}
TSData+=i;
TSSize-=i;
struct TSHDR *tshdr = (struct TSHDR *) TSData;
int pid = (tshdr->PidH << 8) | tshdr->PidL;
if (Pid.Num!=pid)
{
return TS_SIZE; // not for us
}
if ((counter!=-1) && (((counter+1) & 0xF)!=tshdr->Counter))
{
if (counter==tshdr->Counter)
{
// duplicate paket -> just ignore
return TS_SIZE;
}
// sequence error
Reset(MA_ERR_SEQ);
return TS_SIZE;
}
counter=tshdr->Counter;
if ((tshdr->AFC<=0) || (tshdr->AFC>3))
{
Reset(MA_ERR_AFC);
return TS_SIZE;
}
// we just ignore the infos in the adaption field (e.g. OPCR/PCR)
if ((tshdr->AFC!=1) && (tshdr->AFC!=3))
{
return TS_SIZE;
}
if (tshdr->AFC==1)
{
// payload only
buflen=TS_SIZE-sizeof(struct TSHDR);
buf=&TSData[sizeof(struct TSHDR)];
}
if (tshdr->AFC==3)
{
// adaption field + payload
struct TSADAPT *tsadapt = (struct TSADAPT *) &TSData[4];
int alen=tsadapt->Len+1;
buflen=TS_SIZE-(sizeof(struct TSHDR)+alen);
buf=&TSData[sizeof(struct TSHDR)+alen];
}
if (buflen>TS_SIZE)
{
// size to large
Reset(MA_ERR_TOBIG);
return TS_SIZE;
}
if (buflen<0)
{
// error in size
Reset(MA_ERR_NEG);
return TS_SIZE;
}
}
pktdata=(uchar *) realloc(pktdata,pktsize+buflen);
if (!pktdata)
{
Reset(MA_ERR_MEM);
return -1;
}
memcpy(pktdata+pktsize,buf,buflen);
pktsize+=buflen;
if (isPES)
{
bytes_processed=buflen;
}
else
{
bytes_processed=TS_SIZE;
}
}
else
{
bytes_processed=pktsize;
dataleft=false;
}
if (pktinfo.pkthdr==-1)
{
pktinfo.pkthdr=FindPktHeader(pktdata, pktsize, &pktinfo.streamsize, &pktinfo.pkthdrsize);
if (pktinfo.pkthdr==-1)
{
return bytes_processed; // not found any header -> next paket
}
}
int streamsize=0;
int pkthdrsize;
int pkthdr=FindPktHeader(pktdata+pktinfo.pkthdr+pktinfo.pkthdrsize,
pktsize-(pktinfo.pkthdr+pktinfo.pkthdrsize),&streamsize,&pkthdrsize);
if (pkthdr==-1)
{
return bytes_processed; // no next header -> next packet
}
pkthdr+=(pktinfo.pkthdrsize+pktinfo.pkthdr);
// found paket between pktinfo.pkthdr and pkthdr
int size = pkthdr-pktinfo.pkthdr;
if (size<pktinfo.streamsize) size=pktinfo.streamsize;
if (pktsize<size) return bytes_processed; // we need more data!
(*PktData)=pktdata+pktinfo.pkthdr;
(*PktSize)=size;
if (isPES)
{
if (!CheckStreamID(Pid,*PktData,*PktSize))
{
(*PktData)=NULL;
(*PktSize)=0;
}
}
if (pktdatalast) free(pktdatalast);
pktdatalast=pktdata;
int bufleftsize=pktsize-(pktinfo.pkthdr+size);
uchar *bufleft=(uchar *) malloc(bufleftsize);
if (!bufleft)
{
Reset(MA_ERR_MEM);
return bytes_processed;
}
memcpy(bufleft,pktdata+pktinfo.pkthdr+size,bufleftsize);
pktinfo.pkthdr=-1;
pktdata=bufleft;
pktsize=bufleftsize;
bytes_processed-=bufleftsize;
if (bytes_processed<0) bytes_processed=0; // just to be safe
dataleft=true;
return bytes_processed;
}
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