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308 lines
8.2 KiB
308 lines
8.2 KiB
/*
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*
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* $Id: k3blibdvdcss.cpp 619556 2007-01-03 17:38:12Z trueg $
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* Copyright (C) 2004 Sebastian Trueg <trueg@k3b.org>
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*
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* This file is part of the K3b project.
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* Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* See the file "COPYING" for the exact licensing terms.
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*/
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#include <config.h>
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#include "k3blibdvdcss.h"
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#include <k3bdevice.h>
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#include <k3biso9660.h>
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#include <k3biso9660backend.h>
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#include <tqfile.h>
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#include <tqcstring.h>
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#include <tqvaluevector.h>
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#include <tqpair.h>
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#include <dlfcn.h>
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void* K3bLibDvdCss::s_libDvdCss = 0;
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int K3bLibDvdCss::s_counter = 0;
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extern "C" {
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struct dvdcss_s;
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typedef struct dvdcss_s* dvdcss_t;
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dvdcss_t (*k3b_dvdcss_open)(char*);
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int (*k3b_dvdcss_close)( dvdcss_t );
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int (*k3b_dvdcss_seek)( dvdcss_t, int, int );
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int (*k3b_dvdcss_read)( dvdcss_t, void*, int, int );
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}
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class K3bLibDvdCss::Private
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{
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public:
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Private()
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:dvd(0) {
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}
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dvdcss_t dvd;
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K3bDevice::Device* device;
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TQValueVector< TQPair<int,int> > titleOffsets;
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int currentSector;
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bool currentSectorInTitle;
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};
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K3bLibDvdCss::K3bLibDvdCss()
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{
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d = new Private();
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s_counter++;
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}
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K3bLibDvdCss::~K3bLibDvdCss()
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{
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close();
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delete d;
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s_counter--;
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if( s_counter == 0 ) {
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dlclose( s_libDvdCss );
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s_libDvdCss = 0;
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}
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}
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bool K3bLibDvdCss::open( K3bDevice::Device* dev )
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{
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d->device = dev;
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dev->close();
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d->dvd = k3b_dvdcss_open( const_cast<char*>( TQFile::encodeName(dev->blockDeviceName()).data() ) );
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d->currentSector = 0;
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d->currentSectorInTitle = false;
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return ( d->dvd != 0 );
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}
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void K3bLibDvdCss::close()
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{
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if( d->dvd )
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k3b_dvdcss_close( d->dvd );
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d->dvd = 0;
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}
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int K3bLibDvdCss::seek( int sector, int flags )
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{
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return k3b_dvdcss_seek( d->dvd, sector, flags );
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}
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int K3bLibDvdCss::read( void* buffer, int sectors, int flags )
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{
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return k3b_dvdcss_read( d->dvd, buffer, sectors, flags );
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}
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int K3bLibDvdCss::readWrapped( void* buffer, int firstSector, int sectors )
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{
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// 1. are we in a title?
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// 2. does a new title start in the read sector area?
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// - see below, set title if firstSector is the first sector of a new title
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// 3. does a title end in the read sector area?
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// 3.1 does a previous title end
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// 3.2 does the title from 2. already end
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// we need to seek to the first sector. Otherwise we get faulty data.
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bool needToSeek = ( firstSector != d->currentSector || firstSector == 0 );
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bool inTitle = false;
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bool startOfTitle = false;
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//
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// Make sure we never read encrypted and unencrypted data at once since libdvdcss
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// only decrypts the whole area of read sectors or nothing at all.
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//
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for( unsigned int i = 0; i < d->titleOffsets.count(); ++i ) {
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int titleStart = d->titleOffsets[i].first;
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int titleEnd = titleStart + d->titleOffsets[i].second - 1;
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// update key when entrering a new title
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// FIXME: we also need this if we seek into a new title (not only the start of the title)
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if( titleStart == firstSector )
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startOfTitle = needToSeek = inTitle = true;
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// check if a new title or non-title area starts inside the read sector range
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if( firstSector < titleStart && firstSector+sectors > titleStart ) {
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kdDebug() << "(K3bLibDvdCss) title start inside of sector range ("
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<< firstSector << "-" << (firstSector+sectors-1)
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<< "). only reading " << (titleStart - firstSector) << " sectors up to title offset "
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<< (titleStart-1) << endl;
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sectors = titleStart - firstSector;
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}
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if( firstSector < titleEnd && firstSector+sectors > titleEnd ) {
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kdDebug() << "(K3bLibDvdCss) title end inside of sector range ("
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<< firstSector << "-" << (firstSector+sectors-1)
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<< "). only reading " << (titleEnd - firstSector + 1) << " sectors up to title offset "
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<< titleEnd << endl;
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sectors = titleEnd - firstSector + 1;
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inTitle = true;
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}
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// is our read range part of one title
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if( firstSector >= titleStart && firstSector+sectors-1 <= titleEnd )
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inTitle = true;
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}
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if( needToSeek ) {
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int flags = DVDCSS_NOFLAGS;
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if( startOfTitle )
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flags = DVDCSS_SEEK_KEY;
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else if( inTitle )
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flags = DVDCSS_SEEK_MPEG;
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kdDebug() << "(K3bLibDvdCss) need to seek from " << d->currentSector << " to " << firstSector << " with " << flags << endl;
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d->currentSector = seek( firstSector, flags );
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if( d->currentSector != firstSector ) {
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kdDebug() << "(K3bLibDvdCss) seek failed: " << d->currentSector << endl;
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return -1;
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}
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kdDebug() << "(K3bLibDvdCss) seek done: " << d->currentSector << endl;
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}
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int flags = DVDCSS_NOFLAGS;
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if( inTitle )
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flags = DVDCSS_READ_DECRYPT;
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int ret = read( buffer, sectors, flags );
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if( ret >= 0 )
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d->currentSector += ret;
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else
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d->currentSector = 0; // force a seek the next time
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return ret;
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}
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bool K3bLibDvdCss::crackAllKeys()
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{
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//
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// Loop over all titles and crack the keys (inspired by libdvdread)
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//
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kdDebug() << "(K3bLibDvdCss) cracking all keys." << endl;
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d->titleOffsets.clear();
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K3bIso9660 iso( new K3bIso9660DeviceBackend( d->device ) );
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iso.setPlainIso9660( true );
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if( !iso.open() ) {
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kdDebug() << "(K3bLibDvdCss) could not open iso9660 fs." << endl;
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return false;
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}
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#ifdef K3B_DEBUG
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iso.debug();
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#endif
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const K3bIso9660Directory* dir = iso.firstIsoDirEntry();
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int title = 0;
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for( ; title < 100; ++title ) {
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TQString filename;
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// first we get the menu vob
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if( title == 0 )
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filename.sprintf( "VIDEO_TS/VIDEO_TS.VOB" );
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else
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filename.sprintf( "VIDEO_TS/VTS_%02d_%d.VOB", title, 0 );
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const K3bIso9660File* file = dynamic_cast<const K3bIso9660File*>( dir->entry( filename ) );
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if( file && file->size() > 0 ) {
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d->titleOffsets.append( tqMakePair( (int)file->startSector(), (int)(file->size() / 2048U) ) );
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kdDebug() << "(K3bLibDvdCss) Get key for /" << filename << " at " << file->startSector() << endl;
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if( seek( (int)file->startSector(), DVDCSS_SEEK_KEY ) < 0 ) {
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kdDebug() << "(K3bLibDvdCss) unable to seek to " << file->startSector() << endl;
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return false;
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}
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}
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if( title > 0 ) {
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TQPair<int,int> p;
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int vob = 1;
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for( ; vob < 100; ++vob ) {
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filename.sprintf( "VIDEO_TS/VTS_%02d_%d.VOB", title, vob );
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file = dynamic_cast<const K3bIso9660File*>( dir->entry( filename ) );
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if( file ) {
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if( file->size() % 2048 )
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kdError() << "(K3bLibDvdCss) FILESIZE % 2048 != 0!!!" << endl;
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if( vob == 1 ) {
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p.first = file->startSector();
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p.second = file->size() / 2048;
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kdDebug() << "(K3bLibDvdCss) Get key for /" << filename << " at " << file->startSector() << endl;
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if( seek( (int)file->startSector(), DVDCSS_SEEK_KEY ) < 0 ) {
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kdDebug() << "(K3bLibDvdCss) unable to seek to " << file->startSector() << endl;
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return false;
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}
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}
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else {
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p.second += file->size() / 2048;
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}
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}
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else {
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// last vob
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break;
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}
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}
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--vob;
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// last title
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if( vob == 0 )
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break;
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kdDebug() << "(K3bLibDvdCss) Title " << title << " " << vob << " vobs with length " << p.second << endl;
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d->titleOffsets.append( p );
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}
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}
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--title;
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kdDebug() << "(K3bLibDvdCss) found " << title << " titles." << endl;
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return (title > 0);
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}
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K3bLibDvdCss* K3bLibDvdCss::create()
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{
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if( s_libDvdCss == 0 ) {
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s_libDvdCss = dlopen( "libdvdcss.so.2", RTLD_LAZY|RTLD_GLOBAL );
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if( s_libDvdCss ) {
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k3b_dvdcss_open = (dvdcss_t (*)(char*))dlsym( s_libDvdCss, "dvdcss_open" );
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k3b_dvdcss_close = (int (*)( dvdcss_t ))dlsym( s_libDvdCss, "dvdcss_close" );
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k3b_dvdcss_seek = (int (*)( dvdcss_t, int, int ))dlsym( s_libDvdCss, "dvdcss_seek" );
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k3b_dvdcss_read = (int (*)( dvdcss_t, void*, int, int ))dlsym( s_libDvdCss, "dvdcss_read" );
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if( !k3b_dvdcss_open || !k3b_dvdcss_close || !k3b_dvdcss_seek || !k3b_dvdcss_read ) {
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kdDebug() << "(K3bLibDvdCss) unable to resolve libdvdcss." << endl;
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dlclose( s_libDvdCss );
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s_libDvdCss = 0;
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}
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}
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else
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kdDebug() << "(K3bLibDvdCss) unable to load libdvdcss." << endl;
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}
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if( s_libDvdCss )
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return new K3bLibDvdCss();
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else
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return 0;
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}
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