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 "filter_common.h"
38 #include <vlc_image.h>
39 #include "filter_event_info.h"
44 /*****************************************************************************
45 * filter_sys_t : filter descriptor
46 *****************************************************************************/
49 CvMemStorage* p_storage;
50 CvHaarClassifierCascade* p_cascade;
51 video_filter_event_info_t event_info;
55 /****************************************************************************
57 ****************************************************************************/
58 static int OpenFilter ( vlc_object_t * );
59 static void CloseFilter( vlc_object_t * );
61 static picture_t *Filter( filter_t *, picture_t * );
63 /*****************************************************************************
65 *****************************************************************************/
67 set_description( N_("OpenCV face detection example filter") )
68 set_shortname( N_( "OpenCV example" ))
69 set_capability( "opencv example", 1 )
70 add_shortcut( "opencv_example" )
72 set_category( CAT_VIDEO )
73 set_subcategory( SUBCAT_VIDEO_VFILTER2 )
74 set_callbacks( OpenFilter, CloseFilter )
76 add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml", NULL,
77 N_("Haar cascade filename"),
78 N_("Name of XML file containing Haar cascade description"), false);
81 /*****************************************************************************
82 * OpenFilter: probe the filter and return score
83 *****************************************************************************/
84 static int OpenFilter( vlc_object_t *p_this )
86 filter_t *p_filter = (filter_t*)p_this;
89 /* Allocate the memory needed to store the decoder's structure */
90 if( ( p_filter->p_sys = p_sys =
91 (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
96 //init the video_filter_event_info_t struct
97 p_sys->event_info.i_region_size = 0;
98 p_sys->event_info.p_region = NULL;
101 p_filter->pf_video_filter = Filter;
103 //create the VIDEO_FILTER_EVENT_VARIABLE
105 if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
106 msg_Err( p_filter, "Could not create %s", VIDEO_FILTER_EVENT_VARIABLE);
108 val.p_address = &(p_sys->event_info);
109 if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
110 msg_Err( p_filter, "Could not set %s", VIDEO_FILTER_EVENT_VARIABLE);
112 //OpenCV init specific to this example
113 char* filename = var_InheritString( p_filter, "opencv-haarcascade-file" );
114 p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
115 p_sys->p_storage = cvCreateMemStorage(0);
121 /*****************************************************************************
122 * CloseFilter: clean up the filter
123 *****************************************************************************/
124 static void CloseFilter( vlc_object_t *p_this )
126 filter_t *p_filter = (filter_t*)p_this;
127 filter_sys_t *p_sys = p_filter->p_sys;
129 if( p_sys->p_cascade )
130 cvReleaseHaarClassifierCascade( &p_sys->p_cascade );
132 if( p_sys->p_storage )
133 cvReleaseMemStorage( &p_sys->p_storage );
135 free( p_sys->event_info.p_region );
138 var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
141 /****************************************************************************
142 * Filter: Check for faces and raises an event when one is found.
143 ****************************************************************************
144 * p_pic: A picture_t with its p_data_orig member set to an array of
145 * IplImages (one image for each picture_t plane).
146 ****************************************************************************/
147 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
149 IplImage** p_img = NULL;
153 filter_sys_t *p_sys = p_filter->p_sys;
157 msg_Err( p_filter, "no image array" );
160 if (!(p_pic->p_data_orig))
162 msg_Err( p_filter, "no image array" );
165 //(hack) cast the picture_t to array of IplImage*
166 p_img = (IplImage**) p_pic->p_data_orig;
167 i_planes = p_pic->i_planes;
169 //check the image array for validity
170 if ((!p_img[0])) //1st plane is 'I' i.e. greyscale
172 msg_Err( p_filter, "no image" );
175 if ((p_pic->format.i_chroma != VLC_CODEC_I420))
177 msg_Err( p_filter, "wrong chroma - use I420" );
182 msg_Err( p_filter, "no image planes" );
186 //perform face detection
187 cvClearMemStorage(p_sys->p_storage);
188 if( p_sys->p_cascade )
190 //we should make some of these params config variables
191 CvSeq *faces = cvHaarDetectObjects( p_img[0], p_sys->p_cascade,
192 p_sys->p_storage, 1.15, 5,
193 CV_HAAR_DO_CANNY_PRUNING,
195 //create the video_filter_region_info_t struct
196 if (faces && (faces->total > 0))
198 //msg_Dbg( p_filter, "Found %d face(s)", faces->total );
199 free( p_sys->event_info.p_region );
200 p_sys->event_info.p_region = (video_filter_region_info_t*)
201 calloc( faces->total, sizeof(video_filter_region_info_t));
202 if( !p_sys->event_info.p_region )
204 p_sys->event_info.i_region_size = faces->total;
207 //populate the video_filter_region_info_t struct
208 for( i = 0; i < (faces ? faces->total : 0); i++ )
210 CvRect *r = (CvRect*)cvGetSeqElem( faces, i );
212 pt2.x = (r->x+r->width)*scale;
214 pt2.y = (r->y+r->height)*scale;
215 cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
217 *(CvRect*)(&(p_sys->event_info.p_region[i])) = *r;
218 p_sys->event_info.p_region[i].i_id = p_sys->i_id++;
219 p_sys->event_info.p_region[i].p_description = "Face Detected";
222 if (faces && (faces->total > 0)) //raise the video filter event
223 var_TriggerCallback( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE );
226 msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );