/* -*- c++ -*- */
/*
 * Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef INCLUDED_GR_TV_SYNC_H
#define INCLUDED_GR_TV_SYNC_H

#include <gr_block.h>

class gr_tv_sync;
typedef boost::shared_ptr<gr_tv_sync> gr_tv_sync_sptr;

gr_tv_sync_sptr gr_make_tv_sync (double sampling_freq, unsigned int tv_format);

/*!
 * \brief find sync in analog tv signal and produce aligned image
 * \ingroup block
 *
 */
class gr_tv_sync : public gr_block
{
  int	d_seqno;
  //int	d_payload_bytesize;
  int	d_input_block_size;	// bytes
  int	d_output_block_size;	// bytes
	int d_fieldsize;
	int d_initial_fieldsize;
	int d_nsample_in_initial_field;
	int d_nsample_in_field;
	int d_field_start;
	int d_linelength;
	int d_vsyncstart_start_to_active_videostart;
	int d_vsync_nlines;
	int d_ninput;
	int d_min_nsamples;
	bool d_locked;
	double d_sampling_freq;
	unsigned int d_tv_format;
	unsigned char d_synclevel;
	unsigned char d_blacklevel;

  friend gr_tv_sync_sptr gr_make_tv_sync (double sampling_freq, unsigned int tv_format);
  gr_tv_sync (double sampling_freq, unsigned int tv_format);

 public:
	static const int FIELD_TYPE_ODD=2;//The specs say field 1 is even and field 2 is odd. Yes this is odd ;-)
	static const int FIELD_TYPE_EVEN=1;
  void forecast (int noutput_items,
		 gr_vector_int &ninput_items_required);

  int general_work (int noutput_items,
		    gr_vector_int &ninput_items,
		    gr_vector_const_void_star &input_items,
		    gr_vector_void_star &output_items);
 protected:
	bool find_initial_fielddata (const unsigned char *in, int nsamples,int &field_start,int &field_length, int &field_type, int &active_videostart);

};


#endif /* INCLUDED_GR_TV_SYNC_H */