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/*
* ts2pes.cpp: A plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id$
*/
#include "ts2pes.h"
#include <stdio.h>
cMarkAdTS2PES::cMarkAdTS2PES()
{
pesdata=NULL;
pesdatalast=NULL;
Reset();
}
cMarkAdTS2PES::~cMarkAdTS2PES()
{
if (pesdata) free(pesdata);
if (pesdatalast) free(pesdatalast);
}
void cMarkAdTS2PES::Reset()
{
if (pesdata) free(pesdata);
pesdata=NULL;
pessize=0;
data_left=false;
counter=-1;
sync=false;
}
int cMarkAdTS2PES::FindPESHeader(uchar *TSData, int TSSize, int *StreamSize,
int *HeaderSize)
{
if ((!TSData) || (!TSSize)) return -1;
#define PESHDRSIZE 6
if (StreamSize) (*StreamSize)=0;
if (HeaderSize) (*HeaderSize)=3;
//unsigned long scanner=0xFFFFFFFF;
int i=0;
long scanner=-1;
for (i=0; i<TSSize; i++)
{
scanner<<=8;
if (scanner==(long) 0x00000100L)
{
break;
}
scanner|=TSData[i];
}
if (i!=TSSize)
{
if ((StreamSize) && ((i+2)<TSSize))
{
if (TSData[i]>=0xBC)
{
(*StreamSize)=(TSData[i+1]<<8)+TSData[i+2];
if (*StreamSize) (*StreamSize)+=6; // 6 Byte PES-Header
}
}
if ((HeaderSize) && ((i+6)<TSSize))
{
struct PESHDROPT *peshdropt=(struct PESHDROPT *) &TSData[i+3];
if (peshdropt->MarkerBits==0x2)
{
(*HeaderSize)=PESHDRSIZE+sizeof(struct PESHDROPT)+
peshdropt->Length;
}
else
{
(*HeaderSize)=PESHDRSIZE;
}
}
return i-3;
}
return -1;
}
int cMarkAdTS2PES::Process(MarkAdPid Pid, uchar *TSData, int TSSize, uchar **PESData, int *PESSize)
{
if ((!PESData) || (!PESSize) || (!TSData) || (!TSSize)) return -1;
*PESData=NULL;
*PESSize=0;
int buflen=TS_SIZE+1;
uchar *buf=NULL;
int bytes_processed;
if (!data_left)
{
// search for TS packet sync
int i;
for (i=0; i<TSSize; i++)
{
if (TSData[i]==0x47) break;
}
if (i==TSSize)
{
Reset();
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 ((tshdr->PayloadStart==0) && (!sync))
{
return TS_SIZE;
}
else
{
sync=true;
}
if ((counter!=-1) && (((counter+1) & 0xF)!=tshdr->Counter))
{
// sequence error
Reset();
return TS_SIZE;
}
counter=tshdr->Counter;
if ((tshdr->AFC<=0) || (tshdr->AFC>3))
{
Reset();
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();
return TS_SIZE;
}
if (buflen<0)
{
// error in size
Reset();
return TS_SIZE;
}
bytes_processed=TS_SIZE-buflen;
pesdata=(uchar *) realloc(pesdata,pessize+buflen);
if (!pesdata)
{
pessize=0;
return -1;
}
memcpy(pesdata+pessize,buf,buflen);
pessize+=buflen;
bytes_processed+=buflen;
}
else
{
bytes_processed=pessize;
data_left=false;
}
int streamsize=0;
int peshdrsize=3; // size of sync (just as start)
int peshdr=FindPESHeader(pesdata, pessize, &streamsize, &peshdrsize);
if (peshdr==0)
{
if (!streamsize)
{
peshdr=FindPESHeader(pesdata+peshdrsize,pessize-peshdrsize,NULL,NULL);
if (peshdr>=0)
{
peshdr+=peshdrsize;
}
}
else
{
if (pessize>streamsize)
{
int size=pessize-streamsize;
uchar *pesptr=pesdata;
*PESData=pesdata;
*PESSize=streamsize;
if (pesdatalast) free(pesdatalast);
pesdatalast=pesdata;
pesdata=NULL;
pessize=0;
void *ptr=malloc(size);
if (!ptr) return -1;
memcpy(ptr,pesptr+streamsize,size);
bytes_processed-=size;
pessize=size;
pesdata=(uchar *) ptr;
data_left=true;
}
}
}
if (peshdr>0)
{
// start of next PES paket found
if (pesdata)
{
if ((pesdata[0]==0) && (pesdata[1]==0) && (pesdata[2]==1))
{
// return old data
uchar *pesptr=pesdata;
*PESData=pesdata;
*PESSize=peshdr;
if (pesdatalast) free(pesdatalast);
pesdatalast=pesdata;
int size=pessize-peshdr;
pesdata=NULL;
pessize=0;
if (size>0)
{
void *ptr=malloc(size);
if (!ptr) return -1;
memcpy(ptr,pesptr+peshdr,size);
bytes_processed-=size;
pessize=size;
pesdata=(uchar *) ptr;
data_left=true;
}
else
{
// TODO: not sure if this is ok
bytes_processed-=size;
}
}
}
}
return bytes_processed;
}
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