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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 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
*****************************************************************************/
#include <cxcore.h>
#include <cv.h>
#include <highgui.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc/vlc.h>
#include <vlc_decoder.h>
#include <vlc_filter.h>
#include "filter_common.h"
#include <vlc_image.h>
#include "filter_event_info.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( _("OpenCV face detection example filter") );
set_shortname( _( "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"), VLC_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 )
{
msg_Err( p_filter, "out of memory" );
return VLC_EGENERIC;
}
//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\n", 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\n", VIDEO_FILTER_EVENT_VARIABLE);
//OpenCV init specific to this example
char* filename = config_GetPsz( p_filter, "opencv-haarcascade-file" );
p_filter->p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 );
p_filter->p_sys->p_storage = cvCreateMemStorage(0);
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_filter->p_sys->p_cascade )
cvReleaseHaarClassifierCascade( &p_filter->p_sys->p_cascade );
if( p_filter->p_sys->p_storage )
cvReleaseMemStorage( &p_filter->p_sys->p_storage );
if (NULL != p_filter->p_sys->event_info.p_region)
free(p_filter->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;
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_FOURCC('I','4','2','0')))
{
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_filter->p_sys->p_storage);
CvSeq* faces = NULL;
if( p_filter->p_sys->p_cascade )
{
//we should make some of these params config variables
faces = cvHaarDetectObjects( p_img[0], p_filter->p_sys->p_cascade,
p_filter->p_sys->p_storage, 1.15, 5, CV_HAAR_DO_CANNY_PRUNING,
cvSize(20, 20) );
//create the video_filter_region_info_t struct
CvRect* r;
if (faces && (faces->total > 0))
{
//msg_Dbg( p_filter, "Found %d face(s)\n", faces->total );
if (NULL != p_filter->p_sys->event_info.p_region)
{
free(p_filter->p_sys->event_info.p_region);
p_filter->p_sys->event_info.p_region = NULL;
}
if( NULL == ( p_filter->p_sys->event_info.p_region =
(video_filter_region_info_t *)malloc(faces->total*sizeof(video_filter_region_info_t))))
{
msg_Err( p_filter, "out of memory" );
return NULL;
}
memset(p_filter->p_sys->event_info.p_region, 0, faces->total*sizeof(video_filter_region_info_t));
p_filter->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++ )
{
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_filter->p_sys->event_info.p_region[i])) = *r;
p_filter->p_sys->event_info.p_region[i].i_id = p_filter->p_sys->i_id++;
p_filter->p_sys->event_info.p_region[i].p_description = "Face Detected";
}
if (faces && (faces->total > 0)) //raise the video filter event
var_Change( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE, VLC_VAR_TRIGGER_CALLBACKS, NULL, NULL );
}
else
msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );
return p_pic;
}
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