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 *****************************************************************************/
34 #include <vlc_decoder.h>
35 #include <vlc_filter.h>
36 #include "filter_common.h"
37 #include <vlc_image.h>
38 #include "filter_event_info.h"
40 /*****************************************************************************
41 * filter_sys_t : filter descriptor
42 *****************************************************************************/
45 CvMemStorage* p_storage;
46 CvHaarClassifierCascade* p_cascade;
47 video_filter_event_info_t event_info;
51 /****************************************************************************
53 ****************************************************************************/
54 static int OpenFilter ( vlc_object_t * );
55 static void CloseFilter( vlc_object_t * );
57 static picture_t *Filter( filter_t *, picture_t * );
59 /*****************************************************************************
61 *****************************************************************************/
63 set_description( _("OpenCV face detection example filter") );
64 set_shortname( _( "OpenCV example" ));
65 set_capability( "opencv example", 1 );
66 add_shortcut( "opencv_example" );
68 set_category( CAT_VIDEO );
69 set_subcategory( SUBCAT_VIDEO_VFILTER2 );
70 set_callbacks( OpenFilter, CloseFilter );
72 add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml", NULL,
73 N_("Haar cascade filename"),
74 N_("Name of XML file containing Haar cascade description"), VLC_FALSE);
77 /*****************************************************************************
78 * OpenFilter: probe the filter and return score
79 *****************************************************************************/
80 static int OpenFilter( vlc_object_t *p_this )
82 filter_t *p_filter = (filter_t*)p_this;
85 /* Allocate the memory needed to store the decoder's structure */
86 if( ( p_filter->p_sys = p_sys =
87 (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
89 msg_Err( p_filter, "out of memory" );
93 //init the video_filter_event_info_t struct
94 p_sys->event_info.i_region_size = 0;
95 p_sys->event_info.p_region = NULL;
98 p_filter->pf_video_filter = Filter;
100 //create the VIDEO_FILTER_EVENT_VARIABLE
102 if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
103 msg_Err( p_filter, "Could not create %s\n", VIDEO_FILTER_EVENT_VARIABLE);
105 val.p_address = &(p_sys->event_info);
106 if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
107 msg_Err( p_filter, "Could not set %s\n", VIDEO_FILTER_EVENT_VARIABLE);
109 //OpenCV init specific to this example
110 char* filename = config_GetPsz( p_filter, "opencv-haarcascade-file" );
111 p_filter->p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
112 p_filter->p_sys->p_storage = cvCreateMemStorage(0);
117 /*****************************************************************************
118 * CloseFilter: clean up the filter
119 *****************************************************************************/
120 static void CloseFilter( vlc_object_t *p_this )
122 filter_t *p_filter = (filter_t*)p_this;
123 filter_sys_t *p_sys = p_filter->p_sys;
125 if( p_filter->p_sys->p_cascade )
126 cvReleaseHaarClassifierCascade( &p_filter->p_sys->p_cascade );
128 if( p_filter->p_sys->p_storage )
129 cvReleaseMemStorage( &p_filter->p_sys->p_storage );
131 if (NULL != p_filter->p_sys->event_info.p_region)
132 free(p_filter->p_sys->event_info.p_region);
136 var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
139 /****************************************************************************
140 * Filter: Check for faces and raises an event when one is found.
141 ****************************************************************************
142 * p_pic: A picture_t with its p_data_orig member set to an array of
143 * IplImages (one image for each picture_t plane).
144 ****************************************************************************/
145 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
147 IplImage** p_img = NULL;
154 msg_Err( p_filter, "no image array" );
157 if (!(p_pic->p_data_orig))
159 msg_Err( p_filter, "no image array" );
162 //(hack) cast the picture_t to array of IplImage*
163 p_img = (IplImage**) p_pic->p_data_orig;
164 i_planes = p_pic->i_planes;
166 //check the image array for validity
167 if ((!p_img[0])) //1st plane is 'I' i.e. greyscale
169 msg_Err( p_filter, "no image" );
172 if ((p_pic->format.i_chroma != VLC_FOURCC('I','4','2','0')))
174 msg_Err( p_filter, "wrong chroma - use I420" );
179 msg_Err( p_filter, "no image planes" );
183 //perform face detection
184 cvClearMemStorage(p_filter->p_sys->p_storage);
186 if( p_filter->p_sys->p_cascade )
188 //we should make some of these params config variables
189 faces = cvHaarDetectObjects( p_img[0], p_filter->p_sys->p_cascade,
190 p_filter->p_sys->p_storage, 1.15, 5, CV_HAAR_DO_CANNY_PRUNING,
192 //create the video_filter_region_info_t struct
194 if (faces && (faces->total > 0))
196 //msg_Dbg( p_filter, "Found %d face(s)\n", faces->total );
197 if (NULL != p_filter->p_sys->event_info.p_region)
199 free(p_filter->p_sys->event_info.p_region);
200 p_filter->p_sys->event_info.p_region = NULL;
202 if( NULL == ( p_filter->p_sys->event_info.p_region =
203 (video_filter_region_info_t *)malloc(faces->total*sizeof(video_filter_region_info_t))))
205 msg_Err( p_filter, "out of memory" );
208 memset(p_filter->p_sys->event_info.p_region, 0, faces->total*sizeof(video_filter_region_info_t));
209 p_filter->p_sys->event_info.i_region_size = faces->total;
212 //populate the video_filter_region_info_t struct
213 for( i = 0; i < (faces ? faces->total : 0); i++ )
215 r = (CvRect*)cvGetSeqElem( faces, i );
217 pt2.x = (r->x+r->width)*scale;
219 pt2.y = (r->y+r->height)*scale;
220 cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
222 *(CvRect*)(&(p_filter->p_sys->event_info.p_region[i])) = *r;
223 p_filter->p_sys->event_info.p_region[i].i_id = p_filter->p_sys->i_id++;
224 p_filter->p_sys->event_info.p_region[i].p_description = "Face Detected";
227 if (faces && (faces->total > 0)) //raise the video filter event
228 var_Change( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_TRIGGER_CALLBACKS, NULL, NULL );
231 msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );