diff options
Diffstat (limited to 'mpeglib/lib/input/cdromInputStream.cpp')
| -rw-r--r-- | mpeglib/lib/input/cdromInputStream.cpp | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/mpeglib/lib/input/cdromInputStream.cpp b/mpeglib/lib/input/cdromInputStream.cpp new file mode 100644 index 00000000..1cf3f905 --- /dev/null +++ b/mpeglib/lib/input/cdromInputStream.cpp @@ -0,0 +1,309 @@ +/* + reads input data from cdrom + Copyright (C) 1999 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 "cdromInputStream.h" +#include "cdromRawAccess.h" +#include "cdromToc.h" +#include <string.h> +#include "inputDetector.h" + +#include <iostream> + +using namespace std; + +CDRomInputStream::CDRomInputStream() { + cdRomToc=new CDRomToc(); + cdRomRawAccess=new CDRomRawAccess(cdRomToc); + + buflen=0; + bufCurrent=NULL; + + currentMinute=0; + currentSecond=2; + currentFrame=0; + byteCounter=0; +} + + +CDRomInputStream::~CDRomInputStream() { + delete cdRomRawAccess; + delete cdRomToc; +} + + +int CDRomInputStream::readCurrent() { + int ok=cdRomRawAccess->read(currentMinute,currentSecond,currentFrame); + if (ok==false) { + if (cdRomRawAccess->eof() == false) { + int pos=cdRomToc->getNextTocEntryPos(currentMinute, + currentSecond, + currentFrame); + + // now try to read a few sectors + int cnt=0; + int back=false; + + while(1) { + // jump forward + int i; + for(i=0;i<_CDROM_FRAMES-currentFrame;i++) { + next_sector(); + } + cout << "trying next ..."<<endl; + ok=cdRomRawAccess->read(currentMinute,currentSecond,currentFrame); + if (ok) { + bufCurrent=cdRomRawAccess->getBufferStart(); + buflen=cdRomRawAccess->getBufferLen(); + return true; + } + cnt++; + if (cnt > 100) { + break; + } + } + cout << "last possible jump"<<endl; + if (pos > 1) { + TocEntry* tocEntry=cdRomToc->getTocEntry(pos-1); + currentMinute=tocEntry->minute; + currentSecond=tocEntry->second; + currentFrame=tocEntry->frame; + back=cdRomRawAccess->read(currentMinute,currentSecond,currentFrame); + if (back) { + bufCurrent=cdRomRawAccess->getBufferStart(); + buflen=cdRomRawAccess->getBufferLen(); + } + } + return back; + } + return false; + } + bufCurrent=cdRomRawAccess->getBufferStart(); + buflen=cdRomRawAccess->getBufferLen(); + return true; +} + + +int CDRomInputStream::getByteDirect() { + int back; + if (buflen==0) { + fillBuffer(); + } + if (buflen==0){ + return EOF; + } + back=*bufCurrent; + buflen--; + bufCurrent++; + byteCounter++; + return back; +} + + +int CDRomInputStream::read(char* ptr,int size) { + char* dest=(char*)ptr; + int bytesRead=0; + int doRead=size; + int canRead; + + while(eof() == false) { + if (buflen == 0) { + if (fillBuffer() == false) { + return 0; + } + continue; + } + canRead=buflen; + if (doRead < canRead) { + canRead=doRead; + } + memcpy((void*)dest,(void*)bufCurrent,canRead); + buflen-=canRead; + bufCurrent+=canRead; + bytesRead+=canRead; + dest+=canRead; + doRead-=canRead; + if (doRead == 0) { + byteCounter+=bytesRead; + return bytesRead; + } + } + return 0; +} + +int CDRomInputStream::eof() { + return cdRomRawAccess->eof(); +} + + + + +long CDRomInputStream::getBytePosition() { + return byteCounter; +} + + +void CDRomInputStream::print() { +} + + +void CDRomInputStream::next_sector() { + currentFrame++; + if (currentFrame>=_CDROM_FRAMES) { + currentFrame = 0; + currentSecond++; + if (currentSecond>=_CDROM_SECS) { + currentSecond = 0; + currentMinute++; + } + } +} + +int CDRomInputStream::open(const char* file) { + cout << "CDRomInputStream::open:"<<file<<endl; + char* noExtension=InputDetector::getWithoutExtension(file); + cout << "CDRomInputStream::noExt:"<<noExtension<<endl; + if (noExtension == NULL) { + return false; + } + cdRomToc->open(noExtension); + cdRomRawAccess->open(noExtension); + if (isOpen()==false) { + return false; + } + setUrl(noExtension); + int entries=cdRomToc->getTocEntries(); + cdRomToc->print(); + if (entries == 1) { + cerr << "only lead out"<<endl; + } + + // cdRomRawAccess->insertTocEntry(0,2,0); + //cdRomToc->insertTocEntry(1,13,5); + + TocEntry* tocEntry=cdRomToc->getTocEntry(0); + currentMinute=tocEntry->minute; + currentSecond=tocEntry->second; + currentFrame=tocEntry->frame; + delete noExtension; + + return readCurrent(); +} + + +void CDRomInputStream::close() { + cdRomRawAccess->close(); + byteCounter=0; + setUrl(NULL); +} + + +int CDRomInputStream::isOpen() { + return cdRomRawAccess->isOpen(); +} + + + + +long CDRomInputStream::getBytePos(int min,int sec) { + long back; + // 2324 is the size of a cdfram + back=sec*_CDROM_FRAMES*2324; + back=back+min*60*_CDROM_FRAMES*2324; + cout << "CDRomInputStream::getByteLength"<<back<<endl; + return back; +} + +long CDRomInputStream::getByteLength() { + // we get the length out of the toc and then multiply like hell + long totalSecs=cdRomToc->getEndSecond(); + long min=totalSecs/60; + long sec=totalSecs-60*min; + + long back=getBytePos(min,sec); + + return back; +} + + +int CDRomInputStream::seek(long posInBytes) { + int entries=cdRomToc->getTocEntries(); + + TocEntry* firstEntry; + if (entries == 0) { + return false; + } + if (posInBytes < 0) { + return false; + } + firstEntry=cdRomToc->getTocEntry(0); + + long startByte=getBytePos(firstEntry->minute,firstEntry->second+1); + + posInBytes=posInBytes+startByte; + + + float fmin=(float)posInBytes/(float)(60*_CDROM_FRAMES*2324); + int min=(int)fmin; + + + long sec=posInBytes-min*(60*_CDROM_FRAMES*2324); + sec=sec/(_CDROM_FRAMES*2324); + + byteCounter=posInBytes; + if (cdRomRawAccess->read(min,sec,0)==false) { + return false; + } + setTimePos(min*60+sec); + + return true; +} + + +int CDRomInputStream::setTimePos(int second) { + currentFrame=0; + currentMinute=second/60; + currentSecond=second%60; + + return fillBuffer(); +} + + + + + +int CDRomInputStream::fillBuffer() { + int maxNoData=30; + int cnt=0; + if (buflen==0) { + while (cnt < maxNoData) { + next_sector(); + if (readCurrent() == false) { + return false; + } + if (cdRomRawAccess->isData() == false) { + // cerr << "no data"<<endl; + cnt++; + } else { + return true; + } + } + return false; + } + return true; +} + + + + + + |