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