/usr/include/spandsp/private/g726.h is in libspandsp-dev 0.0.6~pre20-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | /*
* SpanDSP - a series of DSP components for telephony
*
* private/g726.h - ITU G.726 codec.
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2006 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if !defined(_SPANDSP_PRIVATE_G726_H_)
#define _SPANDSP_PRIVATE_G726_H_
/*!
* The following is the definition of the state structure
* used by the G.726 encoder and decoder to preserve their internal
* state between successive calls. The meanings of the majority
* of the state structure fields are explained in detail in the
* ITU Recommendation G.726. The field names are essentially indentical
* to variable names in the bit level description of the coding algorithm
* included in this recommendation.
*/
struct g726_state_s
{
/*! The bit rate */
int rate;
/*! The external coding, for tandem operation */
int ext_coding;
/*! The number of bits per sample */
int bits_per_sample;
/*! One of the G.726_PACKING_xxx options */
int packing;
/*! Locked or steady state step size multiplier. */
int32_t yl;
/*! Unlocked or non-steady state step size multiplier. */
int16_t yu;
/*! int16_t term energy estimate. */
int16_t dms;
/*! Long term energy estimate. */
int16_t dml;
/*! Linear weighting coefficient of 'yl' and 'yu'. */
int16_t ap;
/*! Coefficients of pole portion of prediction filter. */
int16_t a[2];
/*! Coefficients of zero portion of prediction filter. */
int16_t b[6];
/*! Signs of previous two samples of a partially reconstructed signal. */
int16_t pk[2];
/*! Previous 6 samples of the quantized difference signal represented in
an internal floating point format. */
int16_t dq[6];
/*! Previous 2 samples of the quantized difference signal represented in an
internal floating point format. */
int16_t sr[2];
/*! Delayed tone detect */
int td;
/*! \brief The bit stream processing context. */
bitstream_state_t bs;
/*! \brief The current encoder function. */
g726_encoder_func_t enc_func;
/*! \brief The current decoder function. */
g726_decoder_func_t dec_func;
};
#endif
/*- End of file ------------------------------------------------------------*/
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