diff options
| author | Johnathan Corgan <johnathan@corganlabs.com> | 2013-04-30 13:34:43 -0700 |
|---|---|---|
| committer | Johnathan Corgan <johnathan@corganlabs.com> | 2013-04-30 13:34:43 -0700 |
| commit | b779505f8f536bbc2fcc58102fd48644a0903874 (patch) | |
| tree | a9106f975d7d4dd26bd5ca69d5ff117710a36cc7 /gr-atsc/include/atsc/randomizer_impl.h | |
| parent | 372bcbcd41df277733a30adeb6a822ebf0ef6ad6 (diff) | |
atsc: moved include dir to gnuradio/atsc
Diffstat (limited to 'gr-atsc/include/atsc/randomizer_impl.h')
| -rw-r--r-- | gr-atsc/include/atsc/randomizer_impl.h | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/gr-atsc/include/atsc/randomizer_impl.h b/gr-atsc/include/atsc/randomizer_impl.h deleted file mode 100644 index 4fdbebc06d..0000000000 --- a/gr-atsc/include/atsc/randomizer_impl.h +++ /dev/null @@ -1,97 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2001 Free Software Foundation, Inc. - * - * This file is part of GNU Radio - * - * GNU Radio 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. - * - * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ - -#ifndef _ATSC_RANDOMIZER_H_ -#define _ATSC_RANDOMIZER_H_ - -#include <atsc/api.h> -#include <atsc/types.h> - -/*! - * \brief ATSC data "whitener" - * - * The data randomizer described in ATSC standard A/53B. - * See figure D4 on page 54. - */ - -class ATSC_API atsci_randomizer { - friend class qa_atsci_randomizer; - - public: - atsci_randomizer(); - - /*! \brief reset randomizer LFSR - * - * must be called during the Data Segment Sync interval prior to the - * first data segment. I.e., the LFSR is reset prior to the first - * field of each VSB data frame. - */ - void reset (); - - //! randomize (whiten) mpeg packet and remove leading MPEG-2 sync byte - void randomize (atsc_mpeg_packet_no_sync &out, const atsc_mpeg_packet &in); - - //! derandomize (de-whiten) mpeg packet and add leading MPEG-2 sync byte - void derandomize (atsc_mpeg_packet &out, const atsc_mpeg_packet_no_sync &in); - - unsigned int state() const { return d_state; } - - private: - static void initialize_output_map (); - static unsigned char slow_output_map (int st); - - static unsigned char fast_output_map (int st){ - return s_output_map[(st & 0xb23c) >> 2]; // Magic const with 8 bits set improves cache - // utilization. The bits correspond to the taps - // used in output calculation. Others may be - // safely ignored. - } - - //! return current output value - unsigned char output (){ - return fast_output_map (d_state); - } - - //! clock LFSR; advance to next state. - void clk (){ - if (d_state & 0x1) - d_state = ((d_state ^ MASK) >> 1) | 0x8000; - else - d_state = d_state >> 1; - } - - //! return current output value and advance to next state - unsigned char output_and_clk (){ - unsigned char r = output (); - clk (); - return r; - } - - unsigned int d_state; - - static const unsigned int PRELOAD_VALUE = 0x018f; /* 0xf180 bit reversed */ - static const unsigned int MASK = 0xa638; - static unsigned char s_output_map[1 << 14]; - static bool s_output_map_initialized_p; -}; - -#endif /* _ATSC_RANDOMIZER_H_ */ |