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private/t4_t6_encode.h
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/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/t4_t6_encode.h - definitions for T.4/T.6 fax compression
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(_SPANDSP_PRIVATE_T4_T6_ENCODE_H_)
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#define _SPANDSP_PRIVATE_T4_T6_ENCODE_H_
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/*!
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T.4 1D, T4 2D and T6 compressor state.
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*/
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struct
t4_t6_encode_state_s
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{
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/*! \brief The minimum number of encoded bits per row. This is a timing thing
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for hardware FAX machines. */
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int
min_bits_per_row
;
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/*! \brief The current maximum contiguous rows that may be 2D encoded. */
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int
max_rows_to_next_1d_row
;
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/*! \brief Number of rows left that can be 2D encoded, before a 1D encoded row
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must be used. */
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int
rows_to_next_1d_row
;
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/*! \brief The number of runs currently in the reference row. */
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int
ref_steps
;
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/*! \brief Pointer to the byte containing the next image bit to transmit. */
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int
bit_pos
;
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/*! \brief Pointer to the bit within the byte containing the next image bit to transmit. */
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int
bit_ptr
;
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/*! \brief Callback function to read a row of pixels from the image source. */
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t4_row_read_handler_t
row_read_handler
;
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/*! \brief Opaque pointer passed to row_read_handler. */
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void
*
row_read_user_data
;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
src
spandsp
private
t4_t6_encode.h
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