1 /*****************************************************************************
2 * opencv_example.cpp : Example OpenCV internal video filter
3 * (performs face identification). Mostly taken from the facedetect.c
5 *****************************************************************************
6 * Copyright (C) 2006-2012 VLC authors and VideoLAN
7 * Copyright (C) 2012 Edward Wang
9 * Authors: Dugal Harris <dugalh@protoclea.co.za>
10 * Edward Wang <edward.c.wang@compdigitec.com>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_filter.h>
39 #include <vlc_image.h>
40 #include "filter_event_info.h"
42 #include <opencv2/core/core_c.h>
43 #include <opencv2/core/core.hpp>
44 #include <opencv2/objdetect/objdetect.hpp>
46 /*****************************************************************************
47 * filter_sys_t : filter descriptor
48 *****************************************************************************/
51 CvMemStorage* p_storage;
52 CvHaarClassifierCascade* p_cascade;
53 video_filter_event_info_t event_info;
57 /****************************************************************************
59 ****************************************************************************/
60 static int OpenFilter ( vlc_object_t * );
61 static void CloseFilter( vlc_object_t * );
63 static picture_t *Filter( filter_t *, picture_t * );
65 /*****************************************************************************
67 *****************************************************************************/
69 set_description( N_("OpenCV face detection example filter") )
70 set_shortname( N_( "OpenCV example" ))
71 set_capability( "opencv internal filter", 1 )
72 add_shortcut( "opencv_example" )
74 set_category( CAT_VIDEO )
75 set_subcategory( SUBCAT_VIDEO_VFILTER )
76 set_callbacks( OpenFilter, CloseFilter )
78 add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml",
79 N_("Haar cascade filename"),
80 N_("Name of XML file containing Haar cascade description"), false);
83 /*****************************************************************************
84 * OpenFilter: probe the filter and return score
85 *****************************************************************************/
86 static int OpenFilter( vlc_object_t *p_this )
88 filter_t *p_filter = (filter_t*)p_this;
91 /* Allocate the memory needed to store the decoder's structure */
92 if( ( p_filter->p_sys = p_sys =
93 (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
98 //init the video_filter_event_info_t struct
99 p_sys->event_info.i_region_size = 0;
100 p_sys->event_info.p_region = NULL;
103 p_filter->pf_video_filter = Filter;
105 //create the VIDEO_FILTER_EVENT_VARIABLE
107 if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
108 msg_Err( p_filter, "Could not create %s", VIDEO_FILTER_EVENT_VARIABLE);
110 val.p_address = &(p_sys->event_info);
111 if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
112 msg_Err( p_filter, "Could not set %s", VIDEO_FILTER_EVENT_VARIABLE);
114 //OpenCV init specific to this example
115 char* filename = var_InheritString( p_filter, "opencv-haarcascade-file" );
116 p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
117 p_sys->p_storage = cvCreateMemStorage(0);
123 /*****************************************************************************
124 * CloseFilter: clean up the filter
125 *****************************************************************************/
126 static void CloseFilter( vlc_object_t *p_this )
128 filter_t *p_filter = (filter_t*)p_this;
129 filter_sys_t *p_sys = p_filter->p_sys;
131 if( p_sys->p_cascade )
132 cvReleaseHaarClassifierCascade( &p_sys->p_cascade );
134 if( p_sys->p_storage )
135 cvReleaseMemStorage( &p_sys->p_storage );
137 free( p_sys->event_info.p_region );
140 var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
143 /****************************************************************************
144 * Filter: Check for faces and raises an event when one is found.
145 ****************************************************************************/
146 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
148 IplImage** p_img = NULL;
151 filter_sys_t *p_sys = p_filter->p_sys;
155 msg_Err( p_filter, "no image array" );
158 //(hack) cast the picture_t to array of IplImage*
159 p_img = (IplImage**) p_pic;
161 //check the image array for validity
162 if ((!p_img[0])) //1st plane is 'I' i.e. greyscale
164 msg_Err( p_filter, "no image" );
168 //perform face detection
169 cvClearMemStorage(p_sys->p_storage);
170 if( p_sys->p_cascade )
172 //we should make some of these params config variables
173 CvSeq *faces = cvHaarDetectObjects( p_img[0], p_sys->p_cascade,
174 p_sys->p_storage, 1.15, 5,
175 CV_HAAR_DO_CANNY_PRUNING,
177 //create the video_filter_region_info_t struct
178 if (faces && (faces->total > 0))
180 //msg_Dbg( p_filter, "Found %d face(s)", faces->total );
181 free( p_sys->event_info.p_region );
182 p_sys->event_info.p_region = (video_filter_region_info_t*)
183 calloc( faces->total, sizeof(video_filter_region_info_t));
184 if( !p_sys->event_info.p_region )
186 p_sys->event_info.i_region_size = faces->total;
189 //populate the video_filter_region_info_t struct
190 for( i = 0; i < (faces ? faces->total : 0); i++ )
192 CvRect *r = (CvRect*)cvGetSeqElem( faces, i );
194 pt2.x = (r->x+r->width)*scale;
196 pt2.y = (r->y+r->height)*scale;
197 cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
199 *(CvRect*)(&(p_sys->event_info.p_region[i])) = *r;
200 p_sys->event_info.p_region[i].i_id = p_sys->i_id++;
201 p_sys->event_info.p_region[i].p_description = "Face Detected";
204 if (faces && (faces->total > 0)) //raise the video filter event
205 var_TriggerCallback( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE );
208 msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );