Network identification example.
#undef NDEBUG
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <errno.h>
#include <libzvbi.h>
static vbi_capture * cap;
static vbi_bool quit;
static unsigned int services;
static void
void * user_data)
{
const char *event_name;
const char *network_name;
const char *call_sign;
char *locale_network_name;
user_data = user_data;
case VBI_EVENT_NETWORK:
event_name = "VBI_EVENT_NETWORK";
quit = TRUE;
break;
case VBI_EVENT_NETWORK_ID:
event_name = "VBI_EVENT_NETWORK_ID";
break;
default:
assert (0);
}
network_name = "unknown";
if (0 != ev->
ev.
network.
name[0])
network_name = (
const char *) ev->ev.network.
name;
"ISO-8859-1",
network_name,
strlen (network_name),
'?');
call_sign = "unknown";
if (0 != ev->ev.network.
call[0])
call_sign = (
const char *) ev->ev.network.
call;
printf ("%s: receiving: \"%s\" call sign: \"%s\" "
"CNI VPS: 0x%x 8/30/1: 0x%x 8/30/2: 0x%x\n",
event_name,
(NULL == locale_network_name) ?
"iconv-error" : locale_network_name,
call_sign,
free (locale_network_name);
}
static void
mainloop (void)
{
struct timeval timeout;
vbi_capture_buffer *sliced_buffer;
unsigned int n_frames;
timeout.tv_sec = 2;
timeout.tv_usec = 0;
if (services & VBI_SLICED_CAPTION_525)
n_frames = 11 * 30;
else
n_frames = 3 * 25;
for (; n_frames > 0; --n_frames) {
unsigned int n_lines;
int r;
r = vbi_capture_pull (cap,
NULL,
&sliced_buffer,
&timeout);
switch (r) {
case -1:
fprintf (stderr, "VBI read error %d (%s)\n",
errno, strerror (errno));
exit (EXIT_FAILURE);
case 0:
fprintf (stderr, "VBI read timeout\n");
exit (EXIT_FAILURE);
case 1:
break;
default:
assert (0);
}
n_lines = sliced_buffer->size /
sizeof (
vbi_sliced);
n_lines,
sliced_buffer->timestamp);
if (quit)
return;
}
printf ("No network ID received or network unknown.\n");
}
int
main (void)
{
char *errstr;
vbi_bool success;
setlocale (LC_ALL, "");
services = (VBI_SLICED_TELETEXT_B |
VBI_SLICED_VPS |
VBI_SLICED_CAPTION_525);
cap = vbi_capture_v4l2_new ("/dev/vbi",
5,
&services,
0,
&errstr,
FALSE);
if (NULL == cap) {
fprintf (stderr,
"Cannot capture VBI data with V4L2 interface:\n"
"%s\n",
errstr);
free (errstr);
exit (EXIT_FAILURE);
}
assert (NULL != dec);
(VBI_EVENT_NETWORK |
VBI_EVENT_NETWORK_ID),
handler,
NULL);
assert (success);
mainloop ();
vbi_capture_delete (cap);
exit (EXIT_SUCCESS);
}
const char * vbi_locale_codeset(void)
Definition conv.c:1237
char * vbi_strndup_iconv(const char *dst_codeset, const char *src_codeset, const char *src, unsigned long src_size, int repl_char)
Definition conv.c:927
vbi_bool vbi_event_handler_add(vbi_decoder *vbi, int event_mask, vbi_event_handler handler, void *user_data)
Definition vbi.c:188
vbi_decoder * vbi_decoder_new(void)
Allocate a new data service decoder instance.
Definition vbi.c:870
void vbi_decode(vbi_decoder *vbi, vbi_sliced *sliced, int lines, double time)
Main function of the data service decoder.
Definition vbi.c:423
void vbi_decoder_delete(vbi_decoder *vbi)
Delete a data service decoder instance.
Definition vbi.c:832
Event union.
Definition event.h:736
int cni_vps
Definition event.h:106
int cni_8302
Definition event.h:126
int cni_8301
Definition event.h:117
signed char call[40]
Definition event.h:86
signed char name[64]
Definition event.h:80
This structure holds one scan line of sliced vbi data.
Definition sliced.h:320