87 lines
3.4 KiB
C
87 lines
3.4 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/t38_non_ecm_buffer.h - A rate adapting buffer for T.38 non-ECM image
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* and TCF data
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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) 2005, 2006, 2007, 2008 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: t38_non_ecm_buffer.h,v 1.2.4.1 2009/12/19 06:43:28 steveu Exp $
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*/
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#if !defined(_SPANDSP_PRIVATE_T38_NON_ECM_BUFFER_H_)
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#define _SPANDSP_PRIVATE_T38_NON_ECM_BUFFER_H_
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/*! \brief A flow controlled non-ECM image data buffer, for buffering T.38 to analogue
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modem data.
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*/
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struct t38_non_ecm_buffer_state_s
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{
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/*! \brief Minimum number of bits per row, used when fill bits are being deleted on the
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link, and restored at the emitting gateway. */
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int min_bits_per_row;
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/*! \brief non-ECM modem transmit data buffer. */
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uint8_t data[T38_NON_ECM_TX_BUF_LEN];
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/*! \brief The current write point in the buffer. */
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int in_ptr;
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/*! \brief The current read point in the buffer. */
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int out_ptr;
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/*! \brief The location of the most recent EOL marker in the buffer. */
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int latest_eol_ptr;
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/*! \brief The number of bits to date in the current row, used when min_row_bits is
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to be applied. */
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int row_bits;
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/*! \brief The bit stream entering the buffer, used to detect EOLs */
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unsigned int bit_stream;
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/*! \brief The non-ECM flow control fill octet (0xFF before the first data, and 0x00
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once data has started). */
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uint8_t flow_control_fill_octet;
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/*! \brief A code for the phase of input buffering, from initial all ones to completion. */
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int input_phase;
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/*! \brief TRUE is the end of non-ECM data indication has been received. */
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int data_finished;
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/*! \brief The current octet being transmitted from the buffer. */
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unsigned int octet;
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/*! \brief The current bit number in the current non-ECM octet. */
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int bit_no;
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/*! \brief TRUE if in image data mode, as opposed to TCF mode. */
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int image_data_mode;
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/*! \brief The number of octets input to the buffer. */
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int in_octets;
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/*! \brief The number of rows input to the buffer. */
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int in_rows;
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/*! \brief The number of non-ECM fill octets generated for minimum row bits
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purposes. */
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int min_row_bits_fill_octets;
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/*! \brief The number of octets output from the buffer. */
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int out_octets;
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/*! \brief The number of rows output from the buffer. */
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int out_rows;
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/*! \brief The number of non-ECM fill octets generated for flow control
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purposes. */
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int flow_control_fill_octets;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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