examples/pdc1.c
/*
* libzvbi VPS/PDC example 1
*
* Copyright (C) 2009 Michael H. Schimek
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: pdc1.c,v 1.2 2009-03-23 01:30:42 mschimek Exp $ */
/* This example shows how to receive Program IDs transmitted in VPS
and Teletext packets using the libzvbi VBI decoder. Example pdc2.c
demonstrates how video recorders respond to Program IDs.
If you prefer to decode the VPS and Teletext packets directly see
test/decode.c for an example.
gcc -o pdc1 pdc1.c `pkg-config zvbi-0.2 --cflags --libs` */
#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_decoder * dec;
/* Attention! This function returns a static string. */
static const char *
pil_str (vbi_pil pil)
{
static char buffer[32];
switch (pil) {
case VBI_PIL_TIMER_CONTROL: return "TC";
case VBI_PIL_INHIBIT_TERMINATE: return "RI/T";
case VBI_PIL_INTERRUPTION: return "INT";
case VBI_PIL_CONTINUE: return "CONT";
case VBI_PIL_NSPV: return "NSPV/END";
default:
snprintf (buffer, sizeof (buffer),
"%02u%02uT%02u%02u",
VBI_PIL_MONTH (pil),
VBI_PIL_DAY (pil),
VBI_PIL_HOUR (pil),
VBI_PIL_MINUTE (pil));
return buffer;
}
}
static void
event_handler (vbi_event * ev,
void * user_data)
{
const vbi_program_id *pid;
user_data = user_data; /* unused, no warning please */
pid = ev->ev.prog_id;
printf ("Received PIL %s/%02X on LC %u.\n",
pil_str (pid->pil), pid->pty, pid->channel);
}
static void
mainloop (void)
{
struct timeval timeout;
/* Don't wait more than two seconds for the driver
to return data. */
timeout.tv_sec = 2;
timeout.tv_usec = 0;
for (;;) {
vbi_capture_buffer *sliced_buffer;
unsigned int n_lines;
int r;
r = vbi_capture_pull (cap,
/* raw_buffer */ NULL,
&sliced_buffer,
&timeout);
switch (r) {
case -1:
fprintf (stderr, "VBI read error %d (%s)\n",
errno, strerror (errno));
/* Could be ignored, esp. EIO with some drivers. */
exit (EXIT_FAILURE);
case 0:
fprintf (stderr, "VBI read timeout\n");
exit (EXIT_FAILURE);
case 1: /* success */
break;
default:
assert (0);
}
n_lines = sliced_buffer->size / sizeof (vbi_sliced);
vbi_decode (dec,
(vbi_sliced *) sliced_buffer->data,
n_lines,
sliced_buffer->timestamp);
}
}
int
main (void)
{
char *errstr;
vbi_bool success;
unsigned int services;
setlocale (LC_ALL, "");
services = (VBI_SLICED_TELETEXT_B |
VBI_SLICED_VPS);
cap = vbi_capture_v4l2_new ("/dev/vbi",
/* buffers */ 5,
&services,
/* strict */ 0,
&errstr,
/* verbose */ FALSE);
if (NULL == cap) {
fprintf (stderr,
"Cannot capture VBI data with V4L2 interface:\n"
"%s\n",
errstr);
free (errstr);
exit (EXIT_FAILURE);
}
dec = vbi_decoder_new ();
assert (NULL != dec);
success = vbi_event_handler_add (dec,
VBI_EVENT_PROG_ID,
event_handler,
/* user_data */ NULL);
assert (success);
mainloop ();
vbi_decoder_delete (dec);
vbi_capture_delete (cap);
exit (EXIT_SUCCESS);
}
vbi_event_handler_add
vbi_bool vbi_event_handler_add(vbi_decoder *vbi, int event_mask, vbi_event_handler handler, void *user_data)
Definition vbi.c:188
VBI_PIL_DAY
#define VBI_PIL_DAY(pil)
Definition pdc.h:79
VBI_PIL_HOUR
#define VBI_PIL_HOUR(pil)
Definition pdc.h:82
vbi_pil
unsigned int vbi_pil
Program Identification Label.
Definition pdc.h:57
VBI_PIL_MINUTE
#define VBI_PIL_MINUTE(pil)
Definition pdc.h:85
VBI_PIL_MONTH
#define VBI_PIL_MONTH(pil)
Definition pdc.h:76
VBI_PIL_CONTINUE
@ VBI_PIL_CONTINUE
Definition pdc.h:145
VBI_PIL_INTERRUPTION
@ VBI_PIL_INTERRUPTION
Definition pdc.h:135
VBI_PIL_INHIBIT_TERMINATE
@ VBI_PIL_INHIBIT_TERMINATE
Definition pdc.h:120
VBI_PIL_NSPV
@ VBI_PIL_NSPV
Definition pdc.h:154
VBI_PIL_TIMER_CONTROL
@ VBI_PIL_TIMER_CONTROL
Definition pdc.h:108
vbi_decoder_new
vbi_decoder * vbi_decoder_new(void)
Allocate a new data service decoder instance.
Definition vbi.c:870
vbi_decode
void vbi_decode(vbi_decoder *vbi, vbi_sliced *sliced, int lines, double time)
Main function of the data service decoder.
Definition vbi.c:423
vbi_decoder_delete
void vbi_decoder_delete(vbi_decoder *vbi)
Delete a data service decoder instance.
Definition vbi.c:832
event_handler
Definition vbi.h:41
vbi_decoder
Definition vbi.h:48
vbi_event
Event union.
Definition event.h:736
vbi_program_id
Program Identification.
Definition pdc.h:351
vbi_program_id::pty
unsigned int pty
Definition pdc.h:421
vbi_program_id::pil
vbi_pil pil
Definition pdc.h:375
vbi_program_id::channel
vbi_pid_channel channel
Definition pdc.h:353
vbi_sliced
This structure holds one scan line of sliced vbi data.
Definition sliced.h:320