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154 lines
6.3 KiB
C
154 lines
6.3 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* t42.h - ITU T.42 JPEG for FAX image 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) 2011 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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/*! \file */
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#if !defined(_SPANDSP_T42_H_)
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#define _SPANDSP_T42_H_
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/*! \page t42_page T.42 (JPEG for FAX) image compression and decompression
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\section t42_page_sec_1 What does it do?
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\section t42_page_sec_1 How does it work?
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*/
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/*! State of a working instance of the T.42 encoder */
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typedef struct t42_encode_state_s t42_encode_state_t;
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/*! State of a working instance of the T.42 decoder */
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typedef struct t42_decode_state_s t42_decode_state_t;
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typedef struct lab_params_s lab_params_t;
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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SPAN_DECLARE(void) srgb_to_lab(lab_params_t *s, uint8_t lab[], const uint8_t srgb[], int pixels);
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SPAN_DECLARE(void) lab_to_srgb(lab_params_t *s, uint8_t srgb[], const uint8_t lab[], int pixels);
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SPAN_DECLARE(void) set_lab_illuminant(lab_params_t *s, float new_xn, float new_yn, float new_zn);
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SPAN_DECLARE(void) set_lab_gamut(lab_params_t *s, int L_min, int L_max, int a_min, int a_max, int b_min, int b_max, int ab_are_signed);
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SPAN_DECLARE(void) set_lab_gamut2(lab_params_t *s, int L_P, int L_Q, int a_P, int a_Q, int b_P, int b_Q);
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SPAN_DECLARE(int) t42_itulab_to_itulab(logging_state_t *logging, tdata_t *dst, tsize_t *dstlen, tdata_t src, tsize_t srclen, uint32_t width, uint32_t height);
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SPAN_DECLARE(int) t42_itulab_to_jpeg(logging_state_t *logging, lab_params_t *s, tdata_t *dst, tsize_t *dstlen, tdata_t src, tsize_t srclen);
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SPAN_DECLARE(int) t42_jpeg_to_itulab(logging_state_t *logging, lab_params_t *s, tdata_t *dst, tsize_t *dstlen, tdata_t src, tsize_t srclen);
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SPAN_DECLARE(int) t42_srgb_to_itulab(logging_state_t *logging, lab_params_t *s, tdata_t *dst, tsize_t *dstlen, tdata_t src, tsize_t srclen, uint32_t width, uint32_t height);
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SPAN_DECLARE(int) t42_itulab_to_srgb(logging_state_t *logging, lab_params_t *s, tdata_t dst, tsize_t *dstlen, tdata_t src, tsize_t srclen, uint32_t *width, uint32_t *height);
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SPAN_DECLARE(void) t42_encode_set_options(t42_encode_state_t *s,
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uint32_t l0,
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int mx,
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int options);
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SPAN_DECLARE(int) t42_encode_set_image_width(t42_encode_state_t *s, uint32_t image_width);
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SPAN_DECLARE(int) t42_encode_set_image_length(t42_encode_state_t *s, uint32_t length);
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SPAN_DECLARE(void) t42_encode_abort(t42_encode_state_t *s);
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SPAN_DECLARE(void) t42_encode_comment(t42_encode_state_t *s, const uint8_t comment[], size_t len);
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/*! \brief Check if we are at the end of the current document page.
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\param s The T.42 context.
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\return 0 for more data to come. SIG_STATUS_END_OF_DATA for no more data. */
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SPAN_DECLARE(int) t42_encode_image_complete(t42_encode_state_t *s);
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SPAN_DECLARE(int) t42_encode_get(t42_encode_state_t *s, uint8_t buf[], size_t max_len);
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SPAN_DECLARE(uint32_t) t42_encode_get_image_width(t42_encode_state_t *s);
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SPAN_DECLARE(uint32_t) t42_encode_get_image_length(t42_encode_state_t *s);
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SPAN_DECLARE(int) t42_encode_get_compressed_image_size(t42_encode_state_t *s);
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SPAN_DECLARE(int) t42_encode_set_row_read_handler(t42_encode_state_t *s,
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t4_row_read_handler_t handler,
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void *user_data);
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SPAN_DECLARE(int) t42_encode_restart(t42_encode_state_t *s, uint32_t image_width, uint32_t image_length);
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SPAN_DECLARE(t42_encode_state_t *) t42_encode_init(t42_encode_state_t *s,
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uint32_t image_width,
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uint32_t image_length,
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t4_row_read_handler_t handler,
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void *user_data);
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SPAN_DECLARE(int) t42_encode_release(t42_encode_state_t *s);
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SPAN_DECLARE(int) t42_encode_free(t42_encode_state_t *s);
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SPAN_DECLARE(void) t42_decode_rx_status(t42_decode_state_t *s, int status);
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SPAN_DECLARE(int) t42_decode_put(t42_decode_state_t *s, const uint8_t data[], size_t len);
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SPAN_DECLARE(int) t42_decode_set_row_write_handler(t42_decode_state_t *s,
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t4_row_write_handler_t handler,
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void *user_data);
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SPAN_DECLARE(int) t42_decode_set_comment_handler(t42_decode_state_t *s,
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uint32_t max_comment_len,
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t4_row_write_handler_t handler,
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void *user_data);
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SPAN_DECLARE(int) t42_decode_set_image_size_constraints(t42_decode_state_t *s,
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uint32_t max_xd,
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uint32_t max_yd);
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SPAN_DECLARE(uint32_t) t42_decode_get_image_width(t42_decode_state_t *s);
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SPAN_DECLARE(uint32_t) t42_decode_get_image_length(t42_decode_state_t *s);
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SPAN_DECLARE(int) t42_decode_get_compressed_image_size(t42_decode_state_t *s);
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SPAN_DECLARE(int) t42_decode_new_plane(t42_decode_state_t *s);
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SPAN_DECLARE(int) t42_decode_restart(t42_decode_state_t *s);
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SPAN_DECLARE(t42_decode_state_t *) t42_decode_init(t42_decode_state_t *s,
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t4_row_write_handler_t handler,
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void *user_data);
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SPAN_DECLARE(int) t42_decode_release(t42_decode_state_t *s);
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SPAN_DECLARE(int) t42_decode_free(t42_decode_state_t *s);
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/*- End of file ------------------------------------------------------------*/
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