143 lines
4.9 KiB
C
143 lines
4.9 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/t4_tx.h - definitions for T.4 FAX transmit processing
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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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* $Id: t4_tx.h,v 1.7.2.4 2009/12/21 17:18:40 steveu Exp $
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*/
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#if !defined(_SPANDSP_PRIVATE_T4_TX_H_)
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#define _SPANDSP_PRIVATE_T4_TX_H_
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typedef struct t4_t6_encode_state_s t4_t6_encode_state_t;
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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 The text which will be used in FAX page header. No text results
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in no header line. */
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const char *header_info;
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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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/*!
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T.4 FAX compression/decompression descriptor. This defines the working state
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for a single instance of a T.4 FAX compression or decompression channel.
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*/
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struct t4_state_s
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{
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/*! \brief The same structure is used for T.4 transmit and receive. This variable
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records which mode is in progress. */
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int rx;
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/*! \brief The type of compression used between the FAX machines. */
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int line_encoding;
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/*! \brief The time at which handling of the current page began. */
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time_t page_start_time;
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/*! \brief The size of the compressed image on the line side, in bits. */
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int line_image_size;
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/*! \brief The current number of bytes per row of uncompressed image data. */
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int bytes_per_row;
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/*! \brief The size of the image in the image buffer, in bytes. */
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int image_size;
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/*! \brief The current size of the image buffer. */
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int image_buffer_size;
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/*! \brief A point to the image buffer. */
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uint8_t *image_buffer;
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/*! \brief The number of pages transferred to date. */
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int current_page;
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/*! \brief Column-to-column (X) resolution in pixels per metre. */
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int x_resolution;
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/*! \brief Row-to-row (Y) resolution in pixels per metre. */
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int y_resolution;
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/*! \brief Width of the current page, in pixels. */
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int image_width;
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/*! \brief Length of the current page, in pixels. */
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int image_length;
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/*! \brief Current pixel row number. */
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int row;
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/*! \brief This variable is set if we are treating the current row as a 2D encoded
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one. */
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int row_is_2d;
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/*! \brief The current length of the current row. */
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int row_len;
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/*! \brief Black and white run-lengths for the current row. */
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uint32_t *cur_runs;
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/*! \brief Black and white run-lengths for the reference row. */
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uint32_t *ref_runs;
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/*! \brief Pointer to the buffer for the current pixel row. */
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uint8_t *row_buf;
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/*! \brief Encoded data bits buffer. */
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uint32_t tx_bitstream;
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/*! \brief The number of bits currently in tx_bitstream. */
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int tx_bits;
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/*! \brief The current number of bits in the current encoded row. */
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int row_bits;
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/*! \brief The minimum bits in any row of the current page. For monitoring only. */
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int min_row_bits;
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/*! \brief The maximum bits in any row of the current page. For monitoring only. */
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int max_row_bits;
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/*! \brief Error and flow logging control */
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logging_state_t logging;
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/*! \brief All TIFF file specific state information for the T.4 context. */
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t4_tiff_state_t tiff;
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t4_t6_decode_state_t t4_t6_rx;
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t4_t6_encode_state_t t4_t6_tx;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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