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/*
*
* Copyright 2009, 2010, 2011, 2012, 2013 KA1RBI
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_P25_FRAME_H
#define INCLUDED_P25_FRAME_H 1
#include <vector>
typedef std::vector<bool> bit_vector;
namespace gr {
namespace op25_repeater {
static const size_t P25_VOICE_FRAME_SIZE = 1728;
static const size_t P25_HEADER_SYMBOLS = 24 + 32 + 1;
static const size_t P25_HEADER_BITS = P25_HEADER_SYMBOLS * 2;
static const uint64_t P25_FRAME_SYNC_MAGIC = 0x5575F5FF77FFLL;
static const uint64_t P25_FRAME_SYNC_REV_P = 0x5575F5FF77FFLL ^ 0xAAAAAAAAAAAALL;
static const uint64_t P25_FRAME_SYNC_MASK = 0xFFFFFFFFFFFFLL;
/* Given a 64-bit frame header word and a frame body which is to be initialized
* 1. Place flags at beginning of frame body
* 2. Store 64-bit frame header word
* 3. FIXME Place first status symbol
*/
static inline void
p25_setup_frame_header(bit_vector& frame_body, uint64_t hw) {
uint64_t acc = P25_FRAME_SYNC_MAGIC;
for (int i=47; i>=0; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
acc = hw;
for (int i=113; i>=72; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
// FIXME: insert proper status dibit bits at 70, 71
frame_body[70] = 1;
frame_body[71] = 0;
for (int i=69; i>=48; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
}
} // namespace op25_repeater
} // namespace gr
#endif /* INCLUDED_P25_FRAME_H */
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