1 /* 2 * Copyright (C) 2010 Nokia Corporation <multimedia@maemo.org> 3 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU Lesser General Public License as published by 6 * the Free Software Foundation; either version 2.1 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 19 #ifndef __LIBV4L_PLUGIN_H 20 #define __LIBV4L_PLUGIN_H 21 22 #include <sys/types.h> 23 24 /* Structure libv4l_dev_ops holds the calls from libv4ls to video nodes. 25 They can be normal open/close/ioctl etc. or any of them may be replaced 26 with a callback by a loaded plugin. 27 */ 28 29 struct libv4l_dev_ops { 30 void * (*init)(int fd); 31 void (*close)(void *dev_ops_priv); 32 int (*ioctl)(void *dev_ops_priv, int fd, unsigned long int request, void *arg); 33 ssize_t (*read)(void *dev_ops_priv, int fd, void *buffer, size_t n); 34 ssize_t (*write)(void *dev_ops_priv, int fd, const void *buffer, size_t n); 35 /* For future plugin API extension, plugins implementing the current API 36 must set these all to NULL, as future versions may check for these */ 37 void (*reserved1)(void); 38 void (*reserved2)(void); 39 void (*reserved3)(void); 40 void (*reserved4)(void); 41 void (*reserved5)(void); 42 void (*reserved6)(void); 43 void (*reserved7)(void); 44 }; 45 46 #endif 47