dvd_reader.c

有关mpeg2的deocde代码

	if( strlen( path_copy ) > 9 ) {
	    if( !strcasecmp( &(path_copy[ strlen( path_copy ) - 9 ]), 
			     "/video_ts" ) ) {
	      path_copy[ strlen( path_copy ) - 9 ] = '\0';
	    }
	}

#if defined(SYS_BSD)
	if( ( fe = getfsfile( path_copy ) ) ) {
	    dev_name = bsd_block2char( fe->fs_spec );
	    fprintf( stderr,
		     "libdvdread: Attempting to use device %s"
		     " mounted on %s for CSS authentication\n",
		     dev_name,
		     fe->fs_file );
	    auth_drive = DVDOpenImageFile( dev_name, have_css );
	}
#elif defined(__sun)
	mntfile = fopen( MNTTAB, "r" );
	if( mntfile ) {
	    struct mnttab mp;
	    int res;

	    while( ( res = getmntent( mntfile, &mp ) ) != -1 ) {
		if( res == 0 && !strcmp( mp.mnt_mountp, path_copy ) ) {
		    dev_name = sun_block2char( mp.mnt_special );
		    fprintf( stderr, 
			     "libdvdread: Attempting to use device %s"
			     " mounted on %s for CSS authentication\n",
			     dev_name,
			     mp.mnt_mountp );
		    auth_drive = DVDOpenImageFile( dev_name, have_css );
		    break;
		}
	    }
	    fclose( mntfile );
	}
#elif defined(__linux__)
        mntfile = fopen( MOUNTED, "r" );
        if( mntfile ) {
            struct mntent *me;
 
            while( ( me = getmntent( mntfile ) ) ) {
                if( !strcmp( me->mnt_dir, path_copy ) ) {
		    fprintf( stderr, 
			     "libdvdread: Attempting to use device %s"
			     " mounted on %s for CSS authentication\n",
			     me->mnt_fsname,
			     me->mnt_dir );
                    auth_drive = DVDOpenImageFile( me->mnt_fsname, have_css );
		    dev_name = strdup(me->mnt_fsname);
                    break;
                }
            }
            fclose( mntfile );
	}
#endif
	if( !dev_name ) {
	  fprintf( stderr, "libdvdread: Couldn't find device name.\n" );
	} else if( !auth_drive ) {
	    fprintf( stderr, "libdvdread: Device %s inaccessible, "
		     "CSS authentication not available.\n", dev_name );
	}

	free( dev_name );
	free( path_copy );

        /**
         * If we've opened a drive, just use that.
         */
        if( auth_drive ) return auth_drive;

        /**
         * Otherwise, we now try to open the directory tree instead.
         */
        return DVDOpenPath( path );
    }

    /* If it's none of the above, screw it. */
    fprintf( stderr, "libdvdread: Could not open %s\n", path );
    return 0;
}

void DVDClose( dvd_reader_t *dvd )
{
    if( dvd ) {
        if( dvd->dev ) dvdinput_close( dvd->dev );
        if( dvd->path_root ) free( dvd->path_root );
	if( dvd->udfcache ) FreeUDFCache( dvd->udfcache );
        free( dvd );
    }
}

/**
 * Open an unencrypted file on a DVD image file.
 */
static dvd_file_t *DVDOpenFileUDF( dvd_reader_t *dvd, char *filename )
{
    uint32_t start, len;
    dvd_file_t *dvd_file;

    start = UDFFindFile( dvd, filename, &len );
    if( !start ) return 0;

    dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
    if( !dvd_file ) return 0;
    dvd_file->dvd = dvd;
    dvd_file->lb_start = start;
    dvd_file->seek_pos = 0;
    memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
    memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
    dvd_file->filesize = len / DVD_VIDEO_LB_LEN;

    return dvd_file;
}

/**
 * Searches for <file> in directory <path>, ignoring case.
 * Returns 0 and full filename in <filename>.
 *     or -1 on file not found.
 *     or -2 on path not found.
 */
static int findDirFile( const char *path, const char *file, char *filename ) 
{
    DIR *dir;
    struct dirent *ent;

    dir = opendir( path );
    if( !dir ) return -2;

    while( ( ent = readdir( dir ) ) != NULL ) {
        if( !strcasecmp( ent->d_name, file ) ) {
            sprintf( filename, "%s%s%s", path,
                     ( ( path[ strlen( path ) - 1 ] == '/' ) ? "" : "/" ),
                     ent->d_name );
            return 0;
        }
    }

    return -1;
}

static int findDVDFile( dvd_reader_t *dvd, const char *file, char *filename )
{
    char video_path[ PATH_MAX + 1 ];
    const char *nodirfile;
    int ret;

    /* Strip off the directory for our search */
    if( !strncasecmp( "/VIDEO_TS/", file, 10 ) ) {
        nodirfile = &(file[ 10 ]);
    } else {
        nodirfile = file;
    }

    ret = findDirFile( dvd->path_root, nodirfile, filename );
    if( ret < 0 ) {
        /* Try also with adding the path, just in case. */
        sprintf( video_path, "%s/VIDEO_TS/", dvd->path_root );
        ret = findDirFile( video_path, nodirfile, filename );
        if( ret < 0 ) {
            /* Try with the path, but in lower case. */
            sprintf( video_path, "%s/video_ts/", dvd->path_root );
            ret = findDirFile( video_path, nodirfile, filename );
            if( ret < 0 ) {
                return 0;
            }
        }
    }

    return 1;
}

/**
 * Open an unencrypted file from a DVD directory tree.
 */
static dvd_file_t *DVDOpenFilePath( dvd_reader_t *dvd, char *filename )
{
    char full_path[ PATH_MAX + 1 ];
    dvd_file_t *dvd_file;
    struct stat fileinfo;
    dvd_input_t dev;

    /* Get the full path of the file. */
    if( !findDVDFile( dvd, filename, full_path ) ) return 0;

    dev = dvdinput_open( full_path );
    if( !dev ) return 0;

    dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
    if( !dvd_file ) return 0;
    dvd_file->dvd = dvd;
    dvd_file->lb_start = 0;
    dvd_file->seek_pos = 0;
    memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
    memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
    dvd_file->filesize = 0;

    if( stat( full_path, &fileinfo ) < 0 ) {
        fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        free( dvd_file );
        return 0;
    }
    dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
    dvd_file->title_devs[ 0 ] = dev;
    dvd_file->filesize = dvd_file->title_sizes[ 0 ];

    return dvd_file;
}

static dvd_file_t *DVDOpenVOBUDF( dvd_reader_t *dvd, int title, int menu )
{
    char filename[ MAX_UDF_FILE_NAME_LEN ];
    uint32_t start, len;
    dvd_file_t *dvd_file;

    if( title == 0 ) {
        sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
    } else {
        sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, menu ? 0 : 1 );
    }
    start = UDFFindFile( dvd, filename, &len );
    if( start == 0 ) return 0;

    dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
    if( !dvd_file ) return 0;
    dvd_file->dvd = dvd;
    /*Hack*/ dvd_file->css_title = title << 1 | menu;
    dvd_file->lb_start = start;
    dvd_file->seek_pos = 0;
    memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
    memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
    dvd_file->filesize = len / DVD_VIDEO_LB_LEN;

    /* Calculate the complete file size for every file in the VOBS */
    if( !menu ) {
        int cur;

        for( cur = 2; cur < 10; cur++ ) {
            sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, cur );
            if( !UDFFindFile( dvd, filename, &len ) ) break;
            dvd_file->filesize += len / DVD_VIDEO_LB_LEN;
        }
    }
    
    if( dvd->css_state == 1 /* Need key init */ ) {
        initAllCSSKeys( dvd );
	dvd->css_state = 2;
    }
    /*    
    if( dvdinput_title( dvd_file->dvd->dev, (int)start ) < 0 ) {
        fprintf( stderr, "libdvdread: Error cracking CSS key for %s\n",
		 filename );
    }
    */
    
    return dvd_file;
}

static dvd_file_t *DVDOpenVOBPath( dvd_reader_t *dvd, int title, int menu )
{
    char filename[ MAX_UDF_FILE_NAME_LEN ];
    char full_path[ PATH_MAX + 1 ];
    struct stat fileinfo;
    dvd_file_t *dvd_file;
    int i;

    dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
    if( !dvd_file ) return 0;
    dvd_file->dvd = dvd;
    /*Hack*/ dvd_file->css_title = title << 1 | menu;
    dvd_file->lb_start = 0;
    dvd_file->seek_pos = 0;
    memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
    memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
    dvd_file->filesize = 0;
    
    if( menu ) {
        dvd_input_t dev;

        if( title == 0 ) {
            sprintf( filename, "VIDEO_TS.VOB" );
        } else {
            sprintf( filename, "VTS_%02i_0.VOB", title );
        }
        if( !findDVDFile( dvd, filename, full_path ) ) {
            free( dvd_file );
            return 0;
        }

        dev = dvdinput_open( full_path );
        if( dev == NULL ) {
            free( dvd_file );
            return 0;
        }

        if( stat( full_path, &fileinfo ) < 0 ) {
            fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
            free( dvd_file );
            return 0;
        }
        dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
        dvd_file->title_devs[ 0 ] = dev;
	dvdinput_title( dvd_file->title_devs[0], 0);
        dvd_file->filesize = dvd_file->title_sizes[ 0 ];

    } else {
        for( i = 0; i < 9; ++i ) {

            sprintf( filename, "VTS_%02i_%i.VOB", title, i + 1 );
            if( !findDVDFile( dvd, filename, full_path ) ) {
                break;
            }

            if( stat( full_path, &fileinfo ) < 0 ) {
                fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
                break;
            }

            dvd_file->title_sizes[ i ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
            dvd_file->title_devs[ i ] = dvdinput_open( full_path );
	    dvdinput_title( dvd_file->title_devs[ i ], 0 );
            dvd_file->filesize += dvd_file->title_sizes[ i ];
        }
        if( !dvd_file->title_devs[ 0 ] ) {
            free( dvd_file );
            return 0;
        }
    }

    return dvd_file;
}

dvd_file_t *DVDOpenFile( dvd_reader_t *dvd, int titlenum, 
			 dvd_read_domain_t domain )
{
    char filename[ MAX_UDF_FILE_NAME_LEN ];
    
    /* Check arguments. */
    if( dvd == NULL || titlenum < 0 )
      return NULL;

    switch( domain ) {
    case DVD_READ_INFO_FILE:
        if( titlenum == 0 ) {
            sprintf( filename, "/VIDEO_TS/VIDEO_TS.IFO" );
        } else {
            sprintf( filename, "/VIDEO_TS/VTS_%02i_0.IFO", titlenum );
        }
        break;
    case DVD_READ_INFO_BACKUP_FILE:
        if( titlenum == 0 ) {
            sprintf( filename, "/VIDEO_TS/VIDEO_TS.BUP" );
        } else {
            sprintf( filename, "/VIDEO_TS/VTS_%02i_0.BUP", titlenum );
        }
        break;
    case DVD_READ_MENU_VOBS:
        if( dvd->isImageFile ) {
            return DVDOpenVOBUDF( dvd, titlenum, 1 );
        } else {
            return DVDOpenVOBPath( dvd, titlenum, 1 );
        }
        break;
    case DVD_READ_TITLE_VOBS:
        if( titlenum == 0 ) return 0;
        if( dvd->isImageFile ) {
            return DVDOpenVOBUDF( dvd, titlenum, 0 );
        } else {
            return DVDOpenVOBPath( dvd, titlenum, 0 );
        }