private/g722.h
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/*
* SpanDSP - a series of DSP components for telephony
*
* private/g722.h - The ITU G.722 codec.
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2005 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.
*
* Based on a single channel G.722 codec which is:
*
***** Copyright (c) CMU 1993 *****
* Computer Science, Speech Group
* Chengxiang Lu and Alex Hauptmann
*/
/*! \file */
#if !defined(_SPANDSP_PRIVATE_G722_H_)
#define _SPANDSP_PRIVATE_G722_H_
/*! The per band parameters for both encoding and decoding G.722 */
typedef struct
{
int16_t nb;
int16_t det;
int16_t s;
int16_t sz;
int16_t r;
int16_t p[2];
int16_t a[2];
int16_t b[6];
int16_t d[7];
} g722_band_t;
/*!
G.722 encode state
*/
struct g722_encode_state_s
{
/*! TRUE if the operating in the special ITU test mode, with the band split filters
disabled. */
int itu_test_mode;
/*! TRUE if the G.722 data is packed */
int packed;
/*! TRUE if encode from 8k samples/second */
int eight_k;
/*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
int bits_per_sample;
/*! Signal history for the QMF */
int16_t x[12];
int16_t y[12];
int ptr;
g722_band_t band[2];
uint32_t in_buffer;
int in_bits;
uint32_t out_buffer;
int out_bits;
};
/*!
G.722 decode state
*/
struct g722_decode_state_s
{
/*! TRUE if the operating in the special ITU test mode, with the band split filters
disabled. */
int itu_test_mode;
/*! TRUE if the G.722 data is packed */
int packed;
/*! TRUE if decode to 8k samples/second */
int eight_k;
/*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
int bits_per_sample;
/*! Signal history for the QMF */
int16_t x[12];
int16_t y[12];
int ptr;
g722_band_t band[2];
uint32_t in_buffer;
int in_bits;
uint32_t out_buffer;
int out_bits;
};
#endif
/*- End of file ------------------------------------------------------------*/
g722_band_t
Definition private/g722.h:40
g722_decode_state_s
Definition private/g722.h:84
g722_decode_state_s::x
int16_t x[12]
Definition private/g722.h:96
g722_decode_state_s::packed
int packed
Definition private/g722.h:89
g722_decode_state_s::eight_k
int eight_k
Definition private/g722.h:91
g722_decode_state_s::itu_test_mode
int itu_test_mode
Definition private/g722.h:87
g722_decode_state_s::bits_per_sample
int bits_per_sample
Definition private/g722.h:93
g722_encode_state_s
Definition private/g722.h:56
g722_encode_state_s::bits_per_sample
int bits_per_sample
Definition private/g722.h:65
g722_encode_state_s::eight_k
int eight_k
Definition private/g722.h:63
g722_encode_state_s::x
int16_t x[12]
Definition private/g722.h:68
g722_encode_state_s::packed
int packed
Definition private/g722.h:61
g722_encode_state_s::itu_test_mode
int itu_test_mode
Definition private/g722.h:59