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vlc/modules/video_filter/opencv_example.cpp

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/*****************************************************************************
* opencv_example.cpp : Example OpenCV internal video filter
* (performs face identification). Mostly taken from the facedetect.c
* OpenCV sample.
*****************************************************************************
* Copyright (C) 2006-2012 VLC authors and VideoLAN
* Copyright (C) 2012 Edward Wang
*
* Authors: Dugal Harris <dugalh@protoclea.co.za>
* Edward Wang <edward.c.wang@compdigitec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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_picture.h>
#include <vlc_vout.h>
#include <vlc_image.h>
#include "filter_event_info.h"
#include <opencv2/core/core_c.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc_c.h>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/objdetect/objdetect.hpp>
/*****************************************************************************
* filter_sys_t : filter descriptor
*****************************************************************************/
namespace {
struct filter_sys_t
{
CvMemStorage* p_storage;
CvHaarClassifierCascade* p_cascade;
video_filter_event_info_t event_info;
int i_id;
};
} // namespace
/****************************************************************************
* Local prototypes
****************************************************************************/
static int OpenFilter ( vlc_object_t * );
static void CloseFilter( filter_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 internal filter", 1 )
add_shortcut( "opencv_example" )
set_subcategory( SUBCAT_VIDEO_VFILTER )
set_callback( OpenFilter )
add_string( "opencv-haarcascade-file", "c:\\haarcascade_frontalface_alt.xml",
N_("Haar cascade filename"),
N_("Name of XML file containing Haar cascade description"))
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;
static const struct FilterOperationInitializer {
struct vlc_filter_operations ops {};
FilterOperationInitializer()
{
ops.filter_video = Filter;
ops.close = CloseFilter;
};
} filter_ops;
p_filter->ops = &filter_ops.ops;
//create the VIDEO_FILTER_EVENT_VARIABLE
vlc_value_t val;
if (var_Create( vlc_object_instance(p_filter), 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( vlc_object_instance(p_filter), 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( filter_t *p_filter )
{
filter_sys_t *p_sys = static_cast<filter_sys_t *>(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( vlc_object_instance(p_filter), VIDEO_FILTER_EVENT_VARIABLE);
}
/****************************************************************************
* Filter: Check for faces and raises an event when one is found.
****************************************************************************/
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
IplImage** p_img = NULL;
CvPoint pt1, pt2;
int scale = 1;
filter_sys_t *p_sys = static_cast<filter_sys_t *>(p_filter->p_sys);
if ((!p_pic) )
{
msg_Err( p_filter, "no image array" );
return NULL;
}
//(hack) cast the picture_t to array of IplImage*
p_img = (IplImage**) p_pic;
//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;
}
//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( int 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( vlc_object_instance(p_filter), VIDEO_FILTER_EVENT_VARIABLE );
}
else
msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );
return p_pic;
}
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