mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
|
/*
|
||
|
|
* Copyright (c) CMU 1993 Computer Science, Speech Group
|
||
|
|
* Chengxiang Lu and Alex Hauptmann
|
||
|
|
* Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
|
||
|
|
* Copyright (c) 2009 Kenan Gillet
|
||
|
|
* Copyright (c) 2010 Martin Storsjo
|
||
|
|
*
|
||
|
|
* This file is part of Libav.
|
||
|
|
*
|
||
|
|
* Libav is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* Libav 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 Libav; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef AVCODEC_G722_H
|
||
|
|
#define AVCODEC_G722_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#define PREV_SAMPLES_BUF_SIZE 1024
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
|
||
|
|
int prev_samples_pos; ///< the number of values in prev_samples
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The band[0] and band[1] correspond respectively to the lower band and higher band.
|
||
|
|
*/
|
||
|
|
struct G722Band {
|
||
|
|
int16_t s_predictor; ///< predictor output value
|
||
|
|
int32_t s_zero; ///< previous output signal from zero predictor
|
||
|
|
int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
|
||
|
|
int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
|
||
|
|
int16_t pole_mem[2]; ///< second-order pole section coefficient buffer
|
||
|
|
int32_t diff_mem[6]; ///< quantizer difference signal memory
|
||
|
|
int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer
|
||
|
|
int16_t log_factor; ///< delayed 2-logarithmic quantizer factor
|
||
|
|
int16_t scale_factor; ///< delayed quantizer scale factor
|
||
|
|
} band[2];
|
||
|
|
|
||
|
|
struct TrellisNode {
|
||
|
|
struct G722Band state;
|
||
|
|
uint32_t ssd;
|
||
|
|
int path;
|
||
|
|
} *node_buf[2], **nodep_buf[2];
|
||
|
|
|
||
|
|
struct TrellisPath {
|
||
|
|
int value;
|
||
|
|
int prev;
|
||
|
|
} *paths[2];
|
||
|
|
} G722Context;
|
||
|
|
|
||
|
|
extern const int16_t ff_g722_high_inv_quant[4];
|
||
|
|
extern const int16_t ff_g722_low_inv_quant4[16];
|
||
|
|
extern const int16_t ff_g722_low_inv_quant6[64];
|
||
|
|
|
||
|
|
void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
|
||
|
|
|
||
|
|
void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
|
||
|
|
const int ihigh);
|
||
|
|
|
||
|
|
void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
|
||
|
|
|
||
|
|
#endif /* AVCODEC_G722_H */
|