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 the VideoLAN team
8 * Authors: Dugal Harris <dugalh@protoclea.co.za>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_filter.h>
37 #include <vlc_image.h>
38 #include "filter_event_info.h"
43 /*****************************************************************************
44 * filter_sys_t : filter descriptor
45 *****************************************************************************/
48 CvMemStorage* p_storage;
49 CvHaarClassifierCascade* p_cascade;
50 video_filter_event_info_t event_info;
54 /****************************************************************************
56 ****************************************************************************/
57 static int OpenFilter ( vlc_object_t * );
58 static void CloseFilter( vlc_object_t * );
60 static picture_t *Filter( filter_t *, picture_t * );
62 /*****************************************************************************
64 *****************************************************************************/
66 set_description( N_("OpenCV face detection example filter") )
67 set_shortname( N_( "OpenCV example" ))
68 set_capability( "opencv example", 1 )
69 add_shortcut( "opencv_example" )
71 set_category( CAT_VIDEO )
72 set_subcategory( SUBCAT_VIDEO_VFILTER2 )
73 set_callbacks( OpenFilter, CloseFilter )
75 add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml", NULL,
76 N_("Haar cascade filename"),
77 N_("Name of XML file containing Haar cascade description"), false);
80 /*****************************************************************************
81 * OpenFilter: probe the filter and return score
82 *****************************************************************************/
83 static int OpenFilter( vlc_object_t *p_this )
85 filter_t *p_filter = (filter_t*)p_this;
88 /* Allocate the memory needed to store the decoder's structure */
89 if( ( p_filter->p_sys = p_sys =
90 (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
95 //init the video_filter_event_info_t struct
96 p_sys->event_info.i_region_size = 0;
97 p_sys->event_info.p_region = NULL;
100 p_filter->pf_video_filter = Filter;
102 //create the VIDEO_FILTER_EVENT_VARIABLE
104 if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
105 msg_Err( p_filter, "Could not create %s", VIDEO_FILTER_EVENT_VARIABLE);
107 val.p_address = &(p_sys->event_info);
108 if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
109 msg_Err( p_filter, "Could not set %s", VIDEO_FILTER_EVENT_VARIABLE);
111 //OpenCV init specific to this example
112 char* filename = var_InheritString( p_filter, "opencv-haarcascade-file" );
113 p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
114 p_sys->p_storage = cvCreateMemStorage(0);
120 /*****************************************************************************
121 * CloseFilter: clean up the filter
122 *****************************************************************************/
123 static void CloseFilter( vlc_object_t *p_this )
125 filter_t *p_filter = (filter_t*)p_this;
126 filter_sys_t *p_sys = p_filter->p_sys;
128 if( p_sys->p_cascade )
129 cvReleaseHaarClassifierCascade( &p_sys->p_cascade );
131 if( p_sys->p_storage )
132 cvReleaseMemStorage( &p_sys->p_storage );
134 free( p_sys->event_info.p_region );
137 var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
140 /****************************************************************************
141 * Filter: Check for faces and raises an event when one is found.
142 ****************************************************************************
143 * p_pic: A picture_t with its p_data_orig member set to an array of
144 * IplImages (one image for each picture_t plane).
145 ****************************************************************************/
146 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
148 IplImage** p_img = NULL;
152 filter_sys_t *p_sys = p_filter->p_sys;
156 msg_Err( p_filter, "no image array" );
159 if (!(p_pic->p_data_orig))
161 msg_Err( p_filter, "no image array" );
164 //(hack) cast the picture_t to array of IplImage*
165 p_img = (IplImage**) p_pic->p_data_orig;
166 i_planes = p_pic->i_planes;
168 //check the image array for validity
169 if ((!p_img[0])) //1st plane is 'I' i.e. greyscale
171 msg_Err( p_filter, "no image" );
174 if ((p_pic->format.i_chroma != VLC_CODEC_I420))
176 msg_Err( p_filter, "wrong chroma - use I420" );
181 msg_Err( p_filter, "no image planes" );
185 //perform face detection
186 cvClearMemStorage(p_sys->p_storage);
187 if( p_sys->p_cascade )
189 //we should make some of these params config variables
190 CvSeq *faces = cvHaarDetectObjects( p_img[0], p_sys->p_cascade,
191 p_sys->p_storage, 1.15, 5,
192 CV_HAAR_DO_CANNY_PRUNING,
194 //create the video_filter_region_info_t struct
195 if (faces && (faces->total > 0))
197 //msg_Dbg( p_filter, "Found %d face(s)", faces->total );
198 free( p_sys->event_info.p_region );
199 p_sys->event_info.p_region = (video_filter_region_info_t*)
200 calloc( faces->total, sizeof(video_filter_region_info_t));
201 if( !p_sys->event_info.p_region )
203 p_sys->event_info.i_region_size = faces->total;
206 //populate the video_filter_region_info_t struct
207 for( i = 0; i < (faces ? faces->total : 0); i++ )
209 CvRect *r = (CvRect*)cvGetSeqElem( faces, i );
211 pt2.x = (r->x+r->width)*scale;
213 pt2.y = (r->y+r->height)*scale;
214 cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
216 *(CvRect*)(&(p_sys->event_info.p_region[i])) = *r;
217 p_sys->event_info.p_region[i].i_id = p_sys->i_id++;
218 p_sys->event_info.p_region[i].p_description = "Face Detected";
221 if (faces && (faces->total > 0)) //raise the video filter event
222 var_TriggerCallback( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE );
225 msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );