atsci_trellis_encoder.h

这是用python语言写的一个数字广播的信号处理工具包。利用它

/* -*- c++ -*- */
/*
 * Copyright 2002 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_TRELLIS_ENCODER_H_
#define _ATSC_TRELLIS_ENCODER_H_

#include <atsci_basic_trellis_encoder.h>
#include <atsc_types.h>

/*!
 * \brief fancy, schmancy 12-way interleaved trellis encoder for ATSC
 */

class atsci_trellis_encoder {
 public:
  static const int	NCODERS = 12;

  atsci_trellis_encoder ();
  ~atsci_trellis_encoder ();

  //! reset all encoder states
  void reset ();

  /*!
   * Take 12 RS encoded, convolutionally interleaved segments and
   * produce 12 trellis coded data segments.  We work in groups of 12
   * because that's the smallest number of segments that composes a
   * single full cycle of the encoder mux.
   */
  void encode (atsc_data_segment out[NCODERS],
	       const atsc_mpeg_packet_rs_encoded in[NCODERS]);

  
 protected:
  static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH;	// 207
  static const int INPUT_SIZE = (SEGMENT_SIZE * 12);
  static const int OUTPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);
  
  void encode_helper (unsigned char out[OUTPUT_SIZE],
		      const unsigned char in[INPUT_SIZE]);

  atsci_basic_trellis_encoder	enc[NCODERS];
  bool				debug;
};


#endif /* _ATSC_TRELLIS_ENCODER_H_ */