[aravis] compiling an example program
- From: Sol Pedre <solpedre@xxxxxxxxx>
- To: aravis@xxxxxxxxxxxxx
- Date: Thu, 10 Apr 2014 15:19:06 -0300
Hello,
I have succesfully installed aravis and used the arv-viewer to see the
input from a DFK 23GM021 The Imaging Source Gige camera.
Now I am trying to use this camera from a C/C++ code that process images.
To start, i am reading the aravis reference manual, and i am trying to
compile the example in the ArvCamera reference page (I paste it below).
However, i am finding several errors, i guess i am missing some library
bindings and others. The first two errors are:
Invalid arguments ' Candidates are: void arv_camera_set_region(_ArvCamera
*, ?, ?, ?, ?)
and
Invalid arguments '
Candidates are: void arv_stream_set_emit_signals(_ArvStream *, ?)
These both functions take gint as parameters, and the code passes gint, but
it does not work.
Please tell me which libraries i should be linking with and where they
should be, and also any light you can shed in those errors...
Thank you very much!!
Sol
---------------
Code:
#include <arv.h>
#include <glib.h>
#include <glib-object.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
typedef struct {
GMainLoop *main_loop;
int buffer_count;
} ApplicationData;
static gboolean cancel = FALSE;
static void
set_cancel (int signal)
{
cancel = TRUE;
}
static void
new_buffer_cb (ArvStream *stream, ApplicationData *data)
{
ArvBuffer *buffer;
buffer = arv_stream_try_pop_buffer (stream);
if (buffer != NULL) {
if (buffer->status == ARV_BUFFER_STATUS_SUCCESS)
data->buffer_count++;
/* Image processing here */
arv_stream_push_buffer (stream, buffer);
}
}
static gboolean
periodic_task_cb (void *abstract_data)
{
ApplicationData *data = (ApplicationData*)abstract_data;
printf ("Frame rate = %d Hz\n", data->buffer_count);
data->buffer_count = 0;
if (cancel) {
g_main_loop_quit (data->main_loop);
return FALSE;
}
return TRUE;
}
static void
control_lost_cb (ArvGvDevice *gv_device)
{
/* Control of the device is lost. Display a message and force
application exit */
printf ("Control lost\n");
cancel = TRUE;
}
int
main (int argc, char **argv)
{
ApplicationData data;
ArvCamera *camera;
ArvStream *stream;
ArvBuffer *buffer;
int i;
data.buffer_count = 0;
/* Mandatory glib type system initialization */
//arv_g_type_init();
g_type_init();
/* Instantiation of the first available camera */
camera = arv_camera_new (NULL);
if (camera != NULL) {
void (*old_sigint_handler)(int);
gint payload;
guint software_trigger_source = 0;
/* Set region of interrest to a 200x200 pixel area */
arv_camera_set_region(camera, (gint)0, (gint)0, (gint)200,
(gint)200);
/* Set frame rate to 10 Hz */
arv_camera_set_frame_rate (camera, 10.0);
/* retrieve image payload (number of bytes per image) */
payload = arv_camera_get_payload (camera);
/* Create a new stream object */
stream = arv_camera_create_stream (camera, NULL, NULL);
if (stream != NULL) {
/* Push 50 buffer in the stream input buffer queue */
for (i = 0; i < 50; i++)
arv_stream_push_buffer (stream, arv_buffer_new (payload,
NULL));
/* Start the video stream */
arv_camera_start_acquisition (camera);
/* Connect the new-buffer signal */
g_signal_connect (stream, "new-buffer", G_CALLBACK
(new_buffer_cb), &data);
/* And enable emission of this signal (it's disabled by default
for performance reason) */
arv_stream_set_emit_signals(stream, TRUE);
/* Connect the control-lost signal */
g_signal_connect (arv_camera_get_device (camera),
"control-lost",
G_CALLBACK (control_lost_cb), NULL);
/* Install the callback for frame rate display */
g_timeout_add_seconds (1, periodic_task_cb, &data);
/* Create a new glib main loop */
data.main_loop = g_main_loop_new (NULL, FALSE);
old_sigint_handler = signal (SIGINT, set_cancel);
/* Run the main loop */
g_main_loop_run (data.main_loop);
signal (SIGINT, old_sigint_handler);
g_main_loop_unref (data.main_loop);
/* Stop the video stream */
arv_camera_stop_acquisition (camera);
g_object_unref (stream);
} else
printf ("Can't create stream thread (check if the device is not
already used)\n");
g_object_unref (camera);
} else
printf ("No camera found\n");
return 0;
}
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