/**
* \brief Seek in the disc and change the current key if requested.
*
* \param dvdcss a \e libdvdcss instance
* \param i_blocks an absolute block offset to seek to
* \param i_flags #DVDCSS_NOFLAGS, optionally ORed with one of #DVDCSS_SEEK_KEY
* or #DVDCSS_SEEK_MPEG
* \return the new position in blocks or a negative value in case an error
* happened.
*
* This function seeks to the requested position, in logical blocks.
*
* You typically set \p i_flags to #DVDCSS_NOFLAGS when seeking in a .IFO.
*
* If #DVDCSS_SEEK_MPEG is specified in \p i_flags and if \e libdvdcss finds it
* reasonable to do so (i.e., if the dvdcss method is not "title"), the current
* title key will be checked and a new one will be calculated if necessary.
* This flag is typically used when reading data from a .VOB file.
*
* If #DVDCSS_SEEK_KEY is specified, the title key will always be checked,
* even with the "title" method. This flag is typically used when seeking
* in a new title.
*/
LIBDVDCSS_EXPORT int dvdcss_seek ( dvdcss_t dvdcss, int i_blocks, int i_flags )
{
/* title cracking method is too slow to be used at each seek */
if( ( ( i_flags & DVDCSS_SEEK_MPEG )
&& ( dvdcss->i_method != DVDCSS_METHOD_TITLE ) )
|| ( i_flags & DVDCSS_SEEK_KEY ) )
{
/* check the title key */
if( dvdcss_title( dvdcss, i_blocks ) )
{
return -1;
}
}
return dvdcss->pf_seek( dvdcss, i_blocks );
}
/* Loop over all titles and call dvdcss_title to crack the keys. */
static int initAllCSSKeys( dvd_reader_t *dvd )
{
//struct timeval all_s, all_e;
//struct timeval t_s, t_e;
char filename[ MAX_UDF_FILE_NAME_LEN ];
uint32_t start, len;
int title;
char *nokeys_str = getenv("DVDREAD_NOKEYS");
if(nokeys_str != NULL)
return 0;
//fprintf( stderr, "\n" );
//fprintf( stderr, "libdvdread: Attempting to retrieve all CSS keys\n" );
//fprintf( stderr, "libdvdread: This can take a _long_ time, please be patient\n\n" );
//gettimeofday(&all_s, NULL);
for( title = 0; title < 100; title++ ) {
//gettimeofday( &t_s, NULL );
if( title == 0 ) {
sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
} else {
sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 0 );
}
start = UDFFindFile( dvd, filename, &len );
if( start != 0 && len != 0 ) {
/* Perform CSS key cracking for this title. */
//fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n", filename, start );
if( dvdcss_title( dvd->fd, (int)start ) < 0 ) {
//fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)\n", filename, start);
}
//gettimeofday( &t_e, NULL );
//fprintf( stderr, "libdvdread: Elapsed time %ld\n",
// (long int) t_e.tv_sec - t_s.tv_sec );
}
if( !title ) continue;
//gettimeofday( &t_s, NULL );
//sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 1 );
start = UDFFindFile( dvd, filename, &len );
if( start == 0 || len == 0 ) break;
/* Perform CSS key cracking for this title. */
//fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n",
// filename, start );
if( dvdcss_title( dvd->fd, (int)start ) < 0 ) {
//fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)!!\n", filename, start);
}
//gettimeofday( &t_e, NULL );
//fprintf( stderr, "libdvdread: Elapsed time %ld\n",
// (long int) t_e.tv_sec - t_s.tv_sec );
}
title--;
//fprintf( stderr, "libdvdread: Found %d VTS's\n", title );
//gettimeofday(&all_e, NULL);
//fprintf( stderr, "libdvdread: Elapsed time %ld\n",
// (long int) all_e.tv_sec - all_s.tv_sec );
return 0;
}