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/*
* libzvbi - Video Program System
*
* Copyright (C) 2000-2004 Michael H. Schimek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: vps.c,v 1.1 2005/10/22 15:46:49 mschimek Exp $ */
#include "../config.h"
#include <assert.h>
#include "vps.h"
/**
* @addtogroup VPS Video Program System Decoder
* @ingroup LowDec
* @brief Functions to decode VPS packets (ETS 300 231).
*/
/**
* @param cni CNI of type VBI3_CNI_TYPE_VPS is stored here.
* @param buffer VPS packet as defined for @c VBI3_SLICED_VPS,
* i.e. 13 bytes without clock run-in and start code.
*
* Decodes a VPS packet according to ETS 300 231, returning the
* 12 bit Country and Network Identifier in @a cni.
*
* The code 0xDC3 is translated according to TR 101 231: "As this
* code is used for a time in two networks a distinction for automatic
* tuning systems is given in data line 16 [VPS]: bit 3 of byte 5 = 1
* for the ARD network / = 0 for the ZDF network."
*
* @returns
* Always @c TRUE, no error checking possible.
*/
vbi3_bool
vbi3_decode_vps_cni (unsigned int * cni,
const uint8_t buffer[13])
{
unsigned int cni_value;
assert (NULL != cni);
assert (NULL != buffer);
cni_value = (+ ((buffer[10] & 0x03) << 10)
+ ((buffer[11] & 0xC0) << 2)
+ (buffer[ 8] & 0xC0)
+ (buffer[11] & 0x3F));
if (0x0DC3 == cni_value)
cni_value = (buffer[2] & 0x10) ?
0x0DC2 /* ZDF */ : 0x0DC1 /* ARD */;
*cni = cni_value;
return TRUE;
}
/**
* @param pid PDC data is stored here.
* @param buffer VPS packet as defined for @c VBI3_SLICED_VPS,
* i.e. 13 bytes without clock run-in and start code.
*
* Decodes a VPS datagram according to ETS 300 231,
* storing PDC recording-control data in @a pid.
*
* @returns
* Always @c TRUE, no error checking possible.
*/
vbi3_bool
vbi3_decode_vps_pdc (vbi3_program_id * pid,
const uint8_t buffer[13])
{
assert (NULL != pid);
assert (NULL != buffer);
pid->cni_type = VBI3_CNI_TYPE_VPS;
pid->cni = (+ ((buffer[10] & 0x03) << 10)
+ ((buffer[11] & 0xC0) << 2)
+ (buffer[ 8] & 0xC0)
+ (buffer[11] & 0x3F));
pid->channel = VBI3_PID_CHANNEL_VPS;
pid->pil = (+ ((buffer[ 8] & 0x3F) << 14)
+ (buffer[ 9] << 6)
+ (buffer[10] >> 2));
pid->month = VBI3_PIL_MONTH (pid->pil) - 1;
pid->day = VBI3_PIL_DAY (pid->pil) - 1;
pid->hour = VBI3_PIL_HOUR (pid->pil);
pid->minute = VBI3_PIL_MINUTE (pid->pil);
pid->length = 0; /* unknown */
pid->luf = FALSE; /* no update, just pil */
pid->mi = FALSE; /* label is not 30 s early */
pid->prf = FALSE; /* prepare to record unknown */
pid->pcs_audio = buffer[ 2] >> 6;
pid->pty = buffer[12];
pid->tape_delayed = FALSE;
return TRUE;
}
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