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#include <stdlib.h>
#include <string.h>
#define __USE_BSD
#include <unistd.h>
#undef __USE_BSD
#include <sys/time.h>
#include <assert.h>
#include "config.h"
#include "uca.h"
#include "uca-cam.h"
#include "uca-grabber.h"
#ifdef HAVE_PTHREADS
#include <pthread.h>
#endif
/**
* User structure for the dummy camera.
*/
typedef struct dummy_cam {
uint32_t bitdepth;
uint32_t frame_rate;
#ifdef HAVE_PTHREADS
pthread_t grab_thread;
bool thread_running;
char *buffer;
#endif
} dummy_cam_t;
static const char g_digits[10][20] = {
/* 0 */
{ 0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0xff, 0x00, 0x00, 0xff,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0x00 },
/* 1 */
{ 0x00, 0x00, 0xff, 0x00,
0x00, 0xff, 0xff, 0x00,
0x00, 0x00, 0xff, 0x00,
0x00, 0x00, 0xff, 0x00,
0x00, 0x00, 0xff, 0x00 },
/* 2 */
{ 0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0x00, 0xff, 0x00,
0x00, 0xff, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff },
/* 3 */
{ 0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0x00, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0x00 },
/* 4 */
{ 0xff, 0x00, 0x00, 0x00,
0xff, 0x00, 0x00, 0xff,
0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff,
0x00, 0x00, 0x00, 0xff },
/* 5 */
{ 0xff, 0xff, 0xff, 0xff,
0xff, 0x00, 0x00, 0x00,
0x00, 0xff, 0xff, 0x00,
0x00, 0x00, 0x00, 0xff,
0xff, 0xff, 0xff, 0x00 },
/* 6 */
{ 0x00, 0xff, 0xff, 0xff,
0xff, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0x00 },
/* 7 */
{ 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff,
0x00, 0x00, 0xff, 0x00,
0x00, 0xff, 0x00, 0x00,
0xff, 0x00, 0x00, 0x00 },
/* 8 */
{ 0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0x00 },
/* 9 */
{ 0x00, 0xff, 0xff, 0x00,
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff,
0xff, 0xff, 0xff, 0x00 }
};
const int DIGIT_WIDTH = 4;
const int DIGIT_HEIGHT = 5;
#define GET_DUMMY(uca) ((struct dummy_cam *)(uca->user))
static void uca_dummy_print_number(char *buffer, int number, int x, int y, int width)
{
for (int i = 0; i < DIGIT_WIDTH; i++) {
for (int j = 0; j < DIGIT_HEIGHT; j++) {
buffer[(y+j)*width + (x+i)] = g_digits[number][j*DIGIT_WIDTH+i];
}
}
}
static void uca_dummy_memcpy(struct uca_camera *cam, char *buffer)
{
/* print current frame number */
unsigned int number = cam->current_frame;
unsigned int divisor = 100000000;
int x = 10;
while (divisor > 1) {
uca_dummy_print_number(buffer, number / divisor, x, 10, cam->frame_width);
number = number % divisor;
divisor = divisor / 10;
x += 5;
}
}
static __suseconds_t uca_dummy_time_diff(struct timeval *start, struct timeval *stop)
{
return (stop->tv_sec - start->tv_sec)*1000000 + (stop->tv_usec - start->tv_usec);
}
static void *uca_dummy_grab_thread(void *arg)
{
struct uca_camera *cam = ((struct uca_camera *) arg);
struct dummy_cam *dc = GET_DUMMY(cam);
assert(dc->frame_rate > 0);
const __useconds_t sleep_time = (unsigned int) 1000000.0f / dc->frame_rate;
__suseconds_t call_time;
struct timeval start, stop;
while (dc->thread_running) {
uca_dummy_memcpy(cam, dc->buffer);
gettimeofday(&start, NULL);
cam->callback(cam->current_frame, dc->buffer, NULL, cam->callback_user);
gettimeofday(&stop, NULL);
call_time = uca_dummy_time_diff(&start, &stop);
if (call_time < sleep_time) {
cam->current_frame++;
usleep(sleep_time - call_time);
}
else
cam->current_frame += call_time / sleep_time;
}
return NULL;
}
/*
* --- interface implementations ----------------------------------------------
*/
static uint32_t uca_dummy_set_property(struct uca_camera *cam, enum uca_property_ids property, void *data)
{
uint32_t err = UCA_ERR_CAMERA | UCA_ERR_PROP;
if (cam->state == UCA_CAM_RECORDING)
return err | UCA_ERR_IS_RECORDING;
switch (property) {
case UCA_PROP_WIDTH:
cam->frame_width = *((uint32_t *) data);
break;
case UCA_PROP_HEIGHT:
cam->frame_height = *((uint32_t *) data);
break;
case UCA_PROP_FRAMERATE:
GET_DUMMY(cam)->frame_rate = *((uint32_t *) data);
break;
default:
return err | UCA_ERR_INVALID;
}
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_get_property(struct uca_camera *cam, enum uca_property_ids property, void *data, size_t num)
{
switch (property) {
case UCA_PROP_NAME:
strncpy((char *) data, "dummy", num);
break;
case UCA_PROP_WIDTH:
uca_set_void(data, uint32_t, cam->frame_width);
break;
case UCA_PROP_WIDTH_MIN:
uca_set_void(data, uint32_t, 1);
break;
case UCA_PROP_WIDTH_MAX:
uca_set_void(data, uint32_t, 4096);
break;
case UCA_PROP_HEIGHT:
uca_set_void(data, uint32_t, cam->frame_height);
break;
case UCA_PROP_HEIGHT_MIN:
uca_set_void(data, uint32_t, 1);
break;
case UCA_PROP_HEIGHT_MAX:
uca_set_void(data, uint32_t, 4096);
break;
case UCA_PROP_BITDEPTH:
uca_set_void(data, uint32_t, 8);
break;
default:
return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
}
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_start_recording(struct uca_camera *cam)
{
if (cam->callback != NULL) {
#ifdef HAVE_PTHREADS
struct dummy_cam *dc = GET_DUMMY(cam);
/* FIXME: handle return value */
dc->thread_running = true;
dc->buffer = (char *) malloc(cam->frame_width * cam->frame_height);
pthread_create(&dc->grab_thread, NULL, &uca_dummy_grab_thread, cam);
#endif
}
cam->current_frame = 0;
cam->state = UCA_CAM_RECORDING;
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_stop_recording(struct uca_camera *cam)
{
struct dummy_cam *dc = GET_DUMMY(cam);
if (cam->callback != NULL) {
dc->thread_running = false;
free(dc->buffer);
dc->buffer = NULL;
}
cam->state = UCA_CAM_ARMED;
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_register_callback(struct uca_camera *cam, uca_cam_grab_callback cb, void *user)
{
if (cam->callback == NULL) {
cam->callback = cb;
cam->callback_user = user;
}
else
return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_grab(struct uca_camera *cam, char *buffer, void *meta_data)
{
if (cam->callback != NULL)
return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
uca_dummy_memcpy(cam, buffer);
cam->current_frame++;
return UCA_NO_ERROR;
}
static uint32_t uca_dummy_destroy(struct uca_camera *cam)
{
struct dummy_cam *dc = GET_DUMMY(cam);
free(dc->buffer);
free(dc);
return UCA_NO_ERROR;
}
uint32_t uca_dummy_init(struct uca_camera **cam, struct uca_grabber *grabber)
{
struct uca_camera *uca = uca_cam_new();
uca->destroy = &uca_dummy_destroy;
uca->set_property = &uca_dummy_set_property;
uca->get_property = &uca_dummy_get_property;
uca->start_recording = &uca_dummy_start_recording;
uca->stop_recording = &uca_dummy_stop_recording;
uca->grab = &uca_dummy_grab;
uca->register_callback = &uca_dummy_register_callback;
uca->state = UCA_CAM_CONFIGURABLE;
uca->frame_width = 320;
uca->frame_height = 240;
struct dummy_cam *dummy_cam = (struct dummy_cam *) malloc(sizeof(struct dummy_cam));
dummy_cam->bitdepth = 8;
dummy_cam->frame_rate = 100;
uca->user = dummy_cam;
*cam = uca;
return UCA_NO_ERROR;
}
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