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/*
demux "normal" mpeg stream (does this have a name?)
Copyright (C) 2001 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "psSystemStream.h"
#include <iostream>
using namespace std;
PSSystemStream::PSSystemStream(InputStream* input) {
this->input=input;
}
PSSystemStream::~PSSystemStream() {
}
int PSSystemStream::read(char* ptr,int bytes) {
if (input->read(ptr,bytes) != bytes) {
return false;
}
paket_read+=bytes;
return true;
}
int PSSystemStream::getByteDirect() {
unsigned char byte;
if (input->read((char*)&byte,1) != 1) {
return -1;
}
paket_read++;
return (int)byte;
}
// nuke bytes modulo 10
int PSSystemStream::nukeBytes(int bytes) {
// nukebuffer
char nuke[10];
while(bytes > 0) {
int doNuke=10;
if (bytes < 10) doNuke=bytes;
if (input->read((char*)&nuke,doNuke) != doNuke) {
return false;
}
bytes-=doNuke;
paket_read+=doNuke;
}
return true;
}
int PSSystemStream::processStartCode(MpegSystemHeader* mpegHeader) {
unsigned int header=mpegHeader->getHeader();
mpegHeader->setPacketLen(0);
mpegHeader->setPacketID(_PAKET_ID_NUKE);
switch(header) {
case _PACK_START_CODE:
return processPackHeader(mpegHeader);
case _SYSTEM_HEADER_START_CODE:
return processSystemHeader(mpegHeader);
default:
cout << "PSSystemStream::processStartCode unknown PS header"<<endl;
exit(-1);
}
// never
return false;
}
int PSSystemStream::processPackHeader(MpegSystemHeader* mpegHeader) {
int back=false;
int numRead;
unsigned long scrbase;
unsigned long scrext;
unsigned long rate;
double timeStamp;
unsigned char inputBuffer[_PACKET_HEADER_SIZE+2];
if (read((char*)inputBuffer, _PACKET_HEADER_SIZE) == false) return false;
// only set this if we do an initialize
int layer=mpegHeader->getLayer();
if (layer == _PACKET_UNKNOWN_LAYER) {
if ((inputBuffer[0]>>6)==1) {
mpegHeader->setMPEG2(true);
}
}
if (mpegHeader->getMPEG2()) {
if (read((char*)inputBuffer+_PACKET_HEADER_SIZE, 2) == false) return false;
scrbase=GET_SCRBASE(inputBuffer);
scrext=GET_SCREXT(inputBuffer);
// BUGGY:
timeStamp = (double)(scrbase*300 + scrext) / (double)MPEG2_CLK_REF;
rate=GET_MPEG2MUXRATE(inputBuffer);
int stuffing = GET_MPEG2STUFFING(inputBuffer); // always <= 7
numRead=stuffing;
if (stuffing) {
if (read((char*)inputBuffer, stuffing) == false) return false;
}
} else {
// MPEG 1
scrbase=GET_SCR(inputBuffer);
timeStamp=(double)scrbase/MPEG1_CLK_REF;
rate=GET_MPEG1_MUXRATE(inputBuffer);
rate*=_MUX_RATE_SCALE_FACTOR;
}
mpegHeader->setSCRTimeStamp(timeStamp);
mpegHeader->setRate(rate);
return true;
}
int PSSystemStream::processSystemHeader(MpegSystemHeader* mpegHeader) {
unsigned char *inputBuffer = NULL;
int numRead;
unsigned short headerSize;
if (read((char *)&headerSize, 2) == false) return false;
headerSize = ntohs(headerSize);
inputBuffer = (unsigned char*) malloc (sizeof(unsigned char)*(headerSize+1));
inputBuffer[headerSize]=0;
if (read((char*)inputBuffer, headerSize) == false) return false;
mpegHeader->resetAvailableLayers();
int i = 6;
while (i<headerSize) {
if (inputBuffer[i] & 0x80) {
mpegHeader->addAvailableLayer(inputBuffer[i]);
}
i += 3;
}
free(inputBuffer);
return true;
}
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