mirror of
https://code.videolan.org/videolan/vlc
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d632dbed7d
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>
235 lines
8.5 KiB
C++
235 lines
8.5 KiB
C++
/*****************************************************************************
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* opencv_example.cpp : Example OpenCV internal video filter
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* (performs face identification). Mostly taken from the facedetect.c
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* OpenCV sample.
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*****************************************************************************
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* Copyright (C) 2006 the VideoLAN team
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*
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* Authors: Dugal Harris <dugalh@protoclea.co.za>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <cxcore.h>
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#include <cv.h>
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#include <highgui.h>
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_filter.h>
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#include <vlc_vout.h>
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#include "filter_common.h"
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#include <vlc_image.h>
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#include "filter_event_info.h"
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/*****************************************************************************
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* filter_sys_t : filter descriptor
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*****************************************************************************/
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struct filter_sys_t
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{
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CvMemStorage* p_storage;
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CvHaarClassifierCascade* p_cascade;
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video_filter_event_info_t event_info;
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int i_id;
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};
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/****************************************************************************
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* Local prototypes
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****************************************************************************/
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static int OpenFilter ( vlc_object_t * );
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static void CloseFilter( vlc_object_t * );
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static picture_t *Filter( filter_t *, picture_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_description( N_("OpenCV face detection example filter") )
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set_shortname( N_( "OpenCV example" ))
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set_capability( "opencv example", 1 )
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add_shortcut( "opencv_example" )
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set_category( CAT_VIDEO )
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set_subcategory( SUBCAT_VIDEO_VFILTER2 )
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set_callbacks( OpenFilter, CloseFilter )
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add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml", NULL,
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N_("Haar cascade filename"),
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N_("Name of XML file containing Haar cascade description"), false);
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vlc_module_end ()
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/*****************************************************************************
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* OpenFilter: probe the filter and return score
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*****************************************************************************/
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static int OpenFilter( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t*)p_this;
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filter_sys_t *p_sys;
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/* Allocate the memory needed to store the decoder's structure */
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if( ( p_filter->p_sys = p_sys =
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(filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
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{
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return VLC_ENOMEM;
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}
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//init the video_filter_event_info_t struct
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p_sys->event_info.i_region_size = 0;
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p_sys->event_info.p_region = NULL;
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p_sys->i_id = 0;
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p_filter->pf_video_filter = Filter;
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//create the VIDEO_FILTER_EVENT_VARIABLE
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vlc_value_t val;
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if (var_Create( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT ) != VLC_SUCCESS)
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msg_Err( p_filter, "Could not create %s", VIDEO_FILTER_EVENT_VARIABLE);
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val.p_address = &(p_sys->event_info);
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if (var_Set( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, val )!=VLC_SUCCESS)
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msg_Err( p_filter, "Could not set %s", VIDEO_FILTER_EVENT_VARIABLE);
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//OpenCV init specific to this example
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char* filename = config_GetPsz( p_filter, "opencv-haarcascade-file" );
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p_filter->p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
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p_filter->p_sys->p_storage = cvCreateMemStorage(0);
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free( filename );
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* CloseFilter: clean up the filter
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*****************************************************************************/
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static void CloseFilter( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t*)p_this;
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filter_sys_t *p_sys = p_filter->p_sys;
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if( p_filter->p_sys->p_cascade )
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cvReleaseHaarClassifierCascade( &p_filter->p_sys->p_cascade );
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if( p_filter->p_sys->p_storage )
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cvReleaseMemStorage( &p_filter->p_sys->p_storage );
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free( p_filter->p_sys->event_info.p_region );
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free( p_sys );
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var_Destroy( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE);
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}
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/****************************************************************************
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* Filter: Check for faces and raises an event when one is found.
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****************************************************************************
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* p_pic: A picture_t with its p_data_orig member set to an array of
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* IplImages (one image for each picture_t plane).
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****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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IplImage** p_img = NULL;
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int i_planes = 0;
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CvPoint pt1, pt2;
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int i, scale = 1;
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if ((!p_pic) )
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{
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msg_Err( p_filter, "no image array" );
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return NULL;
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}
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if (!(p_pic->p_data_orig))
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{
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msg_Err( p_filter, "no image array" );
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return NULL;
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}
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//(hack) cast the picture_t to array of IplImage*
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p_img = (IplImage**) p_pic->p_data_orig;
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i_planes = p_pic->i_planes;
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//check the image array for validity
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if ((!p_img[0])) //1st plane is 'I' i.e. greyscale
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{
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msg_Err( p_filter, "no image" );
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return NULL;
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}
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if ((p_pic->format.i_chroma != VLC_CODEC_I420))
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{
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msg_Err( p_filter, "wrong chroma - use I420" );
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return NULL;
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}
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if (i_planes<1)
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{
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msg_Err( p_filter, "no image planes" );
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return NULL;
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}
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//perform face detection
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cvClearMemStorage(p_filter->p_sys->p_storage);
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CvSeq* faces = NULL;
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if( p_filter->p_sys->p_cascade )
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{
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//we should make some of these params config variables
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faces = cvHaarDetectObjects( p_img[0], p_filter->p_sys->p_cascade,
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p_filter->p_sys->p_storage, 1.15, 5, CV_HAAR_DO_CANNY_PRUNING,
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cvSize(20, 20) );
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//create the video_filter_region_info_t struct
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CvRect* r;
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if (faces && (faces->total > 0))
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{
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//msg_Dbg( p_filter, "Found %d face(s)", faces->total );
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free( p_filter->p_sys->event_info.p_region );
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p_filter->p_sys->event_info.p_region = NULL;
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if( NULL == ( p_filter->p_sys->event_info.p_region =
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(video_filter_region_info_t *)malloc(faces->total*sizeof(video_filter_region_info_t))))
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{
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return NULL;
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}
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memset(p_filter->p_sys->event_info.p_region, 0, faces->total*sizeof(video_filter_region_info_t));
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p_filter->p_sys->event_info.i_region_size = faces->total;
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}
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//populate the video_filter_region_info_t struct
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for( i = 0; i < (faces ? faces->total : 0); i++ )
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{
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r = (CvRect*)cvGetSeqElem( faces, i );
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pt1.x = r->x*scale;
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pt2.x = (r->x+r->width)*scale;
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pt1.y = r->y*scale;
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pt2.y = (r->y+r->height)*scale;
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cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
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*(CvRect*)(&(p_filter->p_sys->event_info.p_region[i])) = *r;
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p_filter->p_sys->event_info.p_region[i].i_id = p_filter->p_sys->i_id++;
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p_filter->p_sys->event_info.p_region[i].p_description = "Face Detected";
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}
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if (faces && (faces->total > 0)) //raise the video filter event
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var_TriggerCallback( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE );
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}
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else
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msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );
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return p_pic;
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}
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