- OpenCV video filter module by Dugal Harris

AUTHORS

@@ -200,6 +200,11 @@ D: XVideo video output
 D: Gnome and Gtk+ interface enhancements
 S: United Kingdom
 
+N: Dugal Harris
+E: dugalh (at) protoclea .dot co dot. za
+D: OpenCV video filter
+S: South Africa
+
 N: Derk-Jan Hartman
 E: hartman@videolan.org
 C: hartman

THANKS

@@ -77,6 +77,7 @@ Jean-Alexis Montignies <ja at sente.ch> - coreaudio multiple streams fix
 Jean-Baptiste Kempf <jb at via dot ecp.fr> - Contrib system upgrade
 Jean-Baptiste Le Stang <jp.lestand at lestang.org> - Equalizer-GUI-fixes (OSX)
 Jean-Philippe Grimaldi <jeanphi at via.ecp.fr> - bug fixes
+Dugal Harris <dugalh at protoclea dot. co dot za > - ActiveX bug fixes
 Jean-Pierre Kuypers <Kuypers at sri.ucl.ac.be> - French translation
 Jeffrey Baker <jwbaker at acm.org> - port of the ALSA plugin to the ALSA 1.0 API
 Jeroen Massar <jeroen at unfix dot org> - IPv6 hostname resolution fix

configure.ac

@@ -1143,6 +1143,7 @@ VLC_ADD_PLUGINS([access_http access_mms access_ftp ipv4])
 VLC_ADD_PLUGINS([packetizer_mpegvideo packetizer_h264])
 VLC_ADD_PLUGINS([packetizer_mpeg4video packetizer_mpeg4audio])
 
+
 if test "${SYS}" != "mingwce"; then
 dnl  VLC_ADD_PLUGINS([externrun])
   VLC_ADD_PLUGINS([access_fake access_filter_timeshift access_filter_record])
@@ -1873,6 +1874,45 @@ then
   fi
 fi
 
+
+dnl
+dnl  OpenCV wrapper and example filters
+dnl
+AC_ARG_ENABLE(opencv,
+  [  --enable-opencv            OpenCV (computer vision) filter (default disabled)])
+if test "${enable_opencv}" = "yes" -a "${CXX}" != "";
+then
+  AC_ARG_WITH(opencv-tree,
+  [    --with-opencv-tree=PATH opencv tree for linking])
+  if test -n "${with_opencv_tree}"
+  then
+    if test "${SYS}" = "mingw32" -o "${SYS}" = "cygwin"
+    then
+	  AC_MSG_CHECKING(for opencv in ${with_opencv_tree})
+	  if test -f ${with_opencv_tree}/cv/include/cv.h -a -f ${with_opencv_tree}/cxcore/include/cxcore.h \
+	    -a -f ${with_opencv_tree}/cvaux/include/cvaux.h -a -f ${with_opencv_tree}/otherlibs/highgui/highgui.h
+      then
+        AC_MSG_RESULT(yes)
+        VLC_ADD_PLUGINS([opencv_wrapper])
+        VLC_ADD_LDFLAGS([opencv_wrapper],[-L${with_opencv_tree}/lib -lcv -lcxcore -lcvaux -lhighgui])
+        VLC_ADD_CFLAGS([opencv_wrapper],[-I${with_opencv_tree}/cv/include -I${with_opencv_tree}/cxcore/include -I${with_opencv_tree}/cvaux/include -I${with_opencv_tree}/otherlibs/highgui])
+        AC_LANG_PUSH(C++)
+        VLC_ADD_PLUGINS([opencv_example])
+        VLC_ADD_LDFLAGS([opencv_example],[-L${with_opencv_tree}/lib -lcv -lcxcore -lcvaux -lhighgui])
+        VLC_ADD_CXXFLAGS([opencv_example],[-I${with_opencv_tree}/cv/include -I${with_opencv_tree}/cxcore/include -I${with_opencv_tree}/cvaux/include -I${with_opencv_tree}/otherlibs/highgui])
+        AC_LANG_POP(C++)        
+	  else
+        dnl  No opencv could be found, sorry
+        AC_MSG_RESULT(no)
+        AC_MSG_ERROR([cannot find opencv in ${with_opencv_tree}])
+	  fi
+    else
+	  AC_MSG_WARN([--enable-opencv currently only works on windows])
+    fi
+  fi  
+fi
+
+
 dnl
 dnl  libsmbclient plugin
 dnl

modules/video_filter/Modules.am

@@ -21,4 +21,6 @@ SOURCES_wave = wave.c
 SOURCES_ripple = ripple.c
 SOURCES_psychedelic = psychedelic.c
 SOURCES_gradient = gradient.c
+SOURCES_opencv_wrapper = opencv_wrapper.c
+SOURCES_opencv_example = opencv_example.cpp
 noinst_HEADERS = filter_common.h

modules/video_filter/filter_event_info.h

+/*****************************************************************************
+ * opencv_event_info.h:
+ *****************************************************************************
+ * Copyright (C) 2004-2005 the VideoLAN team
+ * $Id: ???
+ *
+ * Authors: Dugal Harris 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef FILTER_EVENT_INFO_H_
+#define FILTER_EVENT_INFO_H_
+
+#define VIDEO_FILTER_EVENT_VARIABLE N_("video-filter-event")
+
+typedef struct video_filter_region_info_t
+{
+    int i_x; /* x-coordinate of the left-most rectangle corner[s] */
+    int i_y; /* y-coordinate of the top-most or bottom-most
+                  rectangle corner[s] */
+    int i_width; /* width of the rectangle */
+    int i_height; /* height of the rectangle */
+    
+    int i_id;
+    int i_type;
+    
+    char *p_description;
+    float *pf_param;
+    int i_param_size;
+} video_filter_region_info_t;
+
+typedef struct video_filter_event_info_t
+{
+   video_filter_region_info_t *p_region;
+   int i_region_size;
+} video_filter_event_info_t;
+
+/*class CTest
+{
+public:
+    CTest(){i=0;};
+    void Method(){i=0;};
+    int i;
+};*/
+
+#endif /*FILTER_EVENT_INFO_H_*/

modules/video_filter/opencv_example.cpp

+/*****************************************************************************
+ * opencv_example.cpp : Example OpenCV internal video filter 
+ * (performs face identification).  Mostly taken from the facedetect.c
+ * OpenCV sample.
+ *****************************************************************************
+ * Copyright (C) 2006 the VideoLAN team
+ *
+ * Authors: Dugal Harris <dugalh@protoclea.co.za>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <cxcore.h>
+#include <cv.h>
+#include <highgui.h>
+
+
+#include <vlc/vlc.h>
+#include <vlc/decoder.h>
+#include "vlc_filter.h"
+#include "filter_common.h"
+#include "vlc_image.h"
+#include "filter_event_info.h"
+
+/*****************************************************************************
+ * filter_sys_t : filter descriptor
+ *****************************************************************************/
+struct filter_sys_t
+{
+    CvMemStorage* p_storage;
+    CvHaarClassifierCascade* p_cascade;
+    video_filter_event_info_t event_info;
+    int i_id;
+};
+
+/****************************************************************************
+ * Local prototypes
+ ****************************************************************************/
+static int  OpenFilter ( vlc_object_t * );
+static void CloseFilter( vlc_object_t * );
+
+static picture_t *Filter( filter_t *, picture_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("OpenCV face detection example filter") );
+    set_shortname( N_( "OpenCV example" ));
+    set_capability( "opencv example", 1 );
+    add_shortcut( "opencv_example" );
+    
+    set_category( CAT_VIDEO );
+    set_subcategory( SUBCAT_VIDEO_VFILTER2 );
+    set_callbacks( OpenFilter, CloseFilter );
+
+    add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml", NULL,
+                          N_("Haar cascade filename"), 
+                          N_("Name of XML file containing Haar cascade description"), VLC_FALSE);    
+vlc_module_end();
+
+/*****************************************************************************
+ * OpenFilter: probe the filter and return score
+ *****************************************************************************/
+static int OpenFilter( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t*)p_this;
+    filter_sys_t *p_sys;
+
+    /* Allocate the memory needed to store the decoder's structure */
+    if( ( p_filter->p_sys = p_sys =
+          (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
+    {
+        msg_Err( p_filter, "out of memory" );
+        return VLC_EGENERIC;
+    }
+    
+    //init the video_filter_event_info_t struct   
+    p_sys->event_info.i_region_size = 0;
+    p_sys->event_info.p_region = NULL;
+    p_sys->i_id = 0;
+
+    p_filter->pf_video_filter = Filter;
+
+    //create the VIDEO_FILTER_EVENT_VARIABLE
+    vlc_value_t val;
+    if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
+        msg_Err( p_filter, "Could not create %s\n", VIDEO_FILTER_EVENT_VARIABLE);
+    
+    val.p_address = &(p_sys->event_info);
+    if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
+        msg_Err( p_filter, "Could not set %s\n", VIDEO_FILTER_EVENT_VARIABLE);
+
+    //OpenCV init specific to this example
+    char* filename = config_GetPsz( p_filter, "opencv-haarcascade-file" );
+    p_filter->p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
+    p_filter->p_sys->p_storage = cvCreateMemStorage(0);
+
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * CloseFilter: clean up the filter
+ *****************************************************************************/
+static void CloseFilter( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t*)p_this;
+    filter_sys_t *p_sys = p_filter->p_sys;
+    
+    if( p_filter->p_sys->p_cascade )
+        cvReleaseHaarClassifierCascade( &p_filter->p_sys->p_cascade );
+
+    if( p_filter->p_sys->p_storage )
+        cvReleaseMemStorage( &p_filter->p_sys->p_storage );
+
+    if (NULL != p_filter->p_sys->event_info.p_region)
+        free(p_filter->p_sys->event_info.p_region); 
+
+    free( p_sys );
+
+    var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
+}
+
+/****************************************************************************
+ * Filter: Check for faces and raises an event when one is found.
+ ****************************************************************************
+ * p_pic: A picture_t with its p_data_orig member set to an array of 
+ * IplImages (one image for each picture_t plane). 
+ ****************************************************************************/
+static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
+{
+    IplImage** p_img = NULL;
+    int i_planes = 0;
+    CvPoint pt1, pt2;
+    int i, scale = 1;
+    
+    if ((!p_pic) )
+    {
+        msg_Err( p_filter, "no image array" );
+        return NULL;
+    }
+    if (!(p_pic->p_data_orig))
+    {
+        msg_Err( p_filter, "no image array" );
+        return NULL;
+    }
+    //(hack) cast the picture_t to array of IplImage*
+    p_img = (IplImage**) p_pic->p_data_orig;
+    i_planes = p_pic->i_planes;
+
+    //check the image array for validity
+    if ((!p_img[0]))    //1st plane is 'I' i.e. greyscale
+    {
+        msg_Err( p_filter, "no image" );
+        return NULL;
+    }
+    if ((p_pic->format.i_chroma != VLC_FOURCC('I','4','2','0')))
+    {
+        msg_Err( p_filter, "wrong chroma - use I420" );
+        return NULL;
+    }
+    if (i_planes<1)
+    {
+        msg_Err( p_filter, "no image planes" );
+        return NULL;
+    }
+
+    //perform face detection
+    cvClearMemStorage(p_filter->p_sys->p_storage);
+    CvSeq* faces = NULL; 
+    if( p_filter->p_sys->p_cascade )
+    {
+        //we should make some of these params config variables
+        faces = cvHaarDetectObjects( p_img[0], p_filter->p_sys->p_cascade, 
+            p_filter->p_sys->p_storage, 1.15, 5, CV_HAAR_DO_CANNY_PRUNING,
+                                            cvSize(20, 20) );
+        //create the video_filter_region_info_t struct
+        CvRect* r;
+        if (faces && (faces->total > 0))
+        {
+            //msg_Dbg( p_filter, "Found %d face(s)\n", faces->total );            
+            if (NULL != p_filter->p_sys->event_info.p_region)
+            {
+                free(p_filter->p_sys->event_info.p_region);
+                p_filter->p_sys->event_info.p_region = NULL;
+            } 
+            if( NULL == ( p_filter->p_sys->event_info.p_region =
+                  (video_filter_region_info_t *)malloc(faces->total*sizeof(video_filter_region_info_t))))
+            {
+                msg_Err( p_filter, "out of memory" );
+                return NULL;
+            }
+            memset(p_filter->p_sys->event_info.p_region, 0, faces->total*sizeof(video_filter_region_info_t));
+            p_filter->p_sys->event_info.i_region_size = faces->total;
+        }
+
+        //populate the video_filter_region_info_t struct
+        for( i = 0; i < (faces ? faces->total : 0); i++ )
+        {
+            r = (CvRect*)cvGetSeqElem( faces, i );
+            pt1.x = r->x*scale;
+            pt2.x = (r->x+r->width)*scale;
+            pt1.y = r->y*scale;
+            pt2.y = (r->y+r->height)*scale;
+            cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
+
+            *(CvRect*)(&(p_filter->p_sys->event_info.p_region[i])) = *r;
+            p_filter->p_sys->event_info.p_region[i].i_id = p_filter->p_sys->i_id++;
+            p_filter->p_sys->event_info.p_region[i].p_description = "Face Detected";
+        }
+
+        if (faces && (faces->total > 0))    //raise the video filter event
+            var_Change( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_TRIGGER_CALLBACKS, NULL, NULL );
+    }
+    else
+        msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );
+    
+    return p_pic;
+}
+