Commit 351ccb4a authored by Daniel Drake's avatar Daniel Drake

Add XV-based img_capture_continuous example

parent da071ff8
......@@ -7,6 +7,7 @@ AC_PREREQ([2.61])
AC_PROG_CC
AC_PROG_LIBTOOL
AC_C_INLINE
AM_PROG_CC_C_O
# Library versioning
lt_major="0"
......@@ -31,6 +32,38 @@ AC_ARG_ENABLE([examples-build], [AS_HELP_STRING([--enable-examples-build],
[build_examples='no'])
AM_CONDITIONAL([BUILD_EXAMPLES], [test "x$build_examples" != "xno"])
# Examples build
AC_ARG_ENABLE([x11-examples-build], [AS_HELP_STRING([--enable-x11-examples-build],
[build X11 example applications (default n)])],
[build_x11_examples=$enableval],
[build_x11_examples='no'])
AM_CONDITIONAL([BUILD_X11_EXAMPLES], [test "x$build_x11_examples" != "xno"])
if test "x$build_x11_examples" != "xno"; then
# check for Xv extensions
# imported from Coriander
AC_DEFUN([AC_CHECK_XV],[
AC_SUBST(XV_CFLAGS)
AC_SUBST(XV_LIBS)
AC_MSG_CHECKING(for Xv extensions)
AC_TRY_COMPILE([
#include <X11/Xlib.h>
#include <X11/extensions/Xvlib.h>],[
int main(void) { (void) XvGetPortAttribute(0, 0, 0, 0); return 0; }
],xv=yes,xv=no);
AC_MSG_RESULT($xv)
if test x$xv = xyes; then
XV_LIBS="-lXv -lXext"
XV_CFLAGS=""
AC_DEFINE(HAVE_XV,1,[defined if XV video overlay is available])
else
AC_MSG_ERROR([XV is required for X11 examples])
fi
])
AC_CHECK_XV
fi
# Message logging
AC_ARG_ENABLE([log], [AS_HELP_STRING([--disable-log], [disable all logging])],
[log_enabled=$enableval],
......
......@@ -13,3 +13,11 @@ verify_LDADD = ../libfprint/libfprint.la -lfprint
img_capture_SOURCES = img_capture.c
img_capture_LDADD = ../libfprint/libfprint.la -lfprint
if BUILD_X11_EXAMPLES
noinst_PROGRAMS += img_capture_continuous
img_capture_continuous_CFLAGS = $(X_CFLAGS) $(XV_CFLAGS)
img_capture_continuous_SOURCES = img_capture_continuous.c
img_capture_continuous_LDADD = ../libfprint/libfprint.la -lfprint $(X_LIBS) $(X_PRE_LIBS) $(XV_LIBS) -lX11 $(X_EXTRA_LIBS);
endif
/*
* Example libfprint continuous image capture program
* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libfprint/fprint.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/extensions/Xvlib.h>
#define FORMAT 0x32595559
static int adaptor = -1;
static unsigned char *framebuffer = NULL;
static Display *display = NULL;
static Window window=(Window)NULL;
static XvImage *xv_image = NULL;
static XvAdaptorInfo *info;
static GC gc;
static int connection = -1;
/* based on macro by Bart Nabbe */
#define GREY2YUV(grey, y, u, v)\
y = (9798*grey + 19235*grey + 3736*grey) / 32768;\
u = (-4784*grey - 9437*grey + 14221*grey) / 32768 + 128;\
v = (20218*grey - 16941*grey - 3277*grey) / 32768 + 128;\
y = y < 0 ? 0 : y;\
u = u < 0 ? 0 : u;\
v = v < 0 ? 0 : v;\
y = y > 255 ? 255 : y;\
u = u > 255 ? 255 : u;\
v = v > 255 ? 255 : v
static void grey2yuy2 (unsigned char *grey, unsigned char *YUV, int num) {
int i, j;
int y0, y1, u0, u1, v0, v1;
int gval;
for (i = 0, j = 0; i < num; i += 2, j += 4)
{
gval = grey[i];
GREY2YUV (gval, y0, u0 , v0);
gval = grey[i + 1];
GREY2YUV (gval, y1, u1 , v1);
YUV[j + 0] = y0;
YUV[j + 1] = (u0+u1)/2;
YUV[j + 2] = y1;
YUV[j + 3] = (v0+v1)/2;
}
}
static void display_frame(struct fp_img *img)
{
int width = fp_img_get_width(img);
int height = fp_img_get_height(img);
unsigned char *data = fp_img_get_data(img);
if (adaptor < 0)
return;
grey2yuy2(data, framebuffer, width * height);
xv_image = XvCreateImage(display, info[adaptor].base_id, FORMAT,
framebuffer, width, height);
XvPutImage(display, info[adaptor].base_id, window, gc, xv_image,
0, 0, width, height, 0, 0, width, height);
}
static void QueryXv()
{
int num_adaptors;
int num_formats;
XvImageFormatValues *formats = NULL;
int i,j;
char xv_name[5];
XvQueryAdaptors(display, DefaultRootWindow(display), &num_adaptors,
&info);
for(i = 0; i < num_adaptors; i++) {
formats = XvListImageFormats(display, info[i].base_id,
&num_formats);
for(j = 0; j < num_formats; j++) {
xv_name[4] = 0;
memcpy(xv_name, &formats[j].id, 4);
if(formats[j].id == FORMAT) {
printf("using Xv format 0x%x %s %s\n",
formats[j].id, xv_name,
(formats[j].format==XvPacked)
? "packed" : "planar");
if (adaptor < 0)
adaptor = i;
}
}
}
XFree(formats);
if (adaptor < 0)
printf("No suitable Xv adaptor found\n");
}
static struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
{
struct fp_dscv_dev *ddev = NULL;
int i;
for (i = 0; ddev = discovered_devs[i]; i++) {
struct fp_driver *drv = fp_dscv_dev_get_driver(ddev);
printf("Found device claimed by %s driver\n",
fp_driver_get_full_name(drv));
return ddev;
}
return ddev;
}
int main(void)
{
int r = 1;
XEvent xev;
XGCValues xgcv;
long background=0x010203;
struct fp_dscv_dev *ddev;
struct fp_dscv_dev **discovered_devs;
struct fp_dev *dev;
struct fp_img_dev *imgdev;
int img_width;
int img_height;
int standardize = 0;
r = fp_init();
if (r < 0) {
fprintf(stderr, "Failed to initialize libfprint\n");
exit(1);
}
discovered_devs = fp_discover_devs();
if (!discovered_devs) {
fprintf(stderr, "Could not discover devices\n");
exit(1);
}
ddev = discover_device(discovered_devs);
if (!ddev) {
fprintf(stderr, "No devices detected.\n");
exit(1);
}
dev = fp_dev_open(ddev);
fp_dscv_devs_free(discovered_devs);
if (!dev) {
fprintf(stderr, "Could not open device.\n");
exit(1);
}
imgdev = fp_dev_to_img_dev(dev);
if (!imgdev) {
fprintf(stderr, "could not get image dev, is this an imaging "
"device?\n");
goto out;
}
img_width = fp_imgdev_get_img_width(imgdev);
img_height = fp_imgdev_get_img_height(imgdev);
framebuffer = malloc(img_width * img_height * 2);
if (!framebuffer)
goto out;
/* make the window */
display = XOpenDisplay(getenv("DISPLAY"));
if(display == NULL) {
fprintf(stderr,"Could not open display \"%s\"\n",
getenv("DISPLAY"));
goto out;
}
QueryXv();
if (adaptor < 0)
goto out;
window = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0,
img_width, img_height, 0,
WhitePixel(display, DefaultScreen(display)), background);
XSelectInput(display, window, StructureNotifyMask | KeyPressMask);
XMapWindow(display, window);
connection = ConnectionNumber(display);
gc = XCreateGC(display, window, 0, &xgcv);
printf("Press S to toggle standardized mode, Q to quit\n");
while (1) { /* event loop */
struct fp_img *img;
r = fp_imgdev_capture(imgdev, 1, &img);
if (r) {
fprintf(stderr, "image capture failed, code %d\n", r);
goto out;
}
if (standardize)
fp_img_standardize(img);
display_frame(img);
fp_img_free(img);
XFlush(display);
while (XPending(display) > 0) {
XNextEvent(display, &xev);
if (xev.type != KeyPress)
continue;
switch (XKeycodeToKeysym(display, xev.xkey.keycode, 0)) {
case XK_q:
case XK_Q:
r = 0;
goto out;
break;
case XK_s:
case XK_S:
standardize = !standardize;
break;
}
} /* XPending */
}
r = 0;
out:
if (framebuffer)
free(framebuffer);
fp_dev_close(dev);
if ((void *) window != NULL)
XUnmapWindow(display, window);
if (display != NULL)
XFlush(display);
return r;
}
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