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libavcodec
g722.h
Go to the documentation of this file.
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/*
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* Copyright (c) CMU 1993 Computer Science, Speech Group
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* Chengxiang Lu and Alex Hauptmann
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* Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
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* Copyright (c) 2009 Kenan Gillet
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* Copyright (c) 2010 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* 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 Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_G722_H
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#define AVCODEC_G722_H
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#include <stdint.h>
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#include "
avcodec.h
"
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#define PREV_SAMPLES_BUF_SIZE 1024
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typedef
struct
G722Context
{
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const
AVClass
*
class
;
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int
bits_per_codeword
;
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int16_t
prev_samples
[
PREV_SAMPLES_BUF_SIZE
];
///< memory of past decoded samples
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int
prev_samples_pos
;
///< the number of values in prev_samples
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/**
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* The band[0] and band[1] correspond respectively to the lower band and higher band.
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*/
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struct
G722Band
{
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int16_t
s_predictor
;
///< predictor output value
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int32_t
s_zero
;
///< previous output signal from zero predictor
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int8_t
part_reconst_mem
[2];
///< signs of previous partially reconstructed signals
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int16_t
prev_qtzd_reconst
;
///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
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int16_t
pole_mem
[2];
///< second-order pole section coefficient buffer
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int32_t
diff_mem
[6];
///< quantizer difference signal memory
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int16_t
zero_mem
[6];
///< Seventh-order zero section coefficient buffer
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int16_t
log_factor
;
///< delayed 2-logarithmic quantizer factor
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int16_t
scale_factor
;
///< delayed quantizer scale factor
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}
band
[2];
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struct
TrellisNode
{
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struct
G722Band
state
;
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uint32_t
ssd
;
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int
path
;
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} *
node_buf
[2], **
nodep_buf
[2];
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struct
TrellisPath
{
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int
value
;
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int
prev
;
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} *
paths
[2];
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}
G722Context
;
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extern
const
int16_t
ff_g722_high_inv_quant
[4];
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extern
const
int16_t
ff_g722_low_inv_quant4
[16];
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extern
const
int16_t
ff_g722_low_inv_quant6
[64];
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void
ff_g722_update_low_predictor
(
struct
G722Band *
band
,
const
int
ilow);
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void
ff_g722_update_high_predictor
(
struct
G722Band *
band
,
const
int
dhigh,
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const
int
ihigh);
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void
ff_g722_apply_qmf
(
const
int16_t *prev_samples,
int
*xout1,
int
*xout2);
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#endif
/* AVCODEC_G722_H */
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