yading@10: /*
yading@10:  * Copyright (c) CMU 1993 Computer Science, Speech Group
yading@10:  *                        Chengxiang Lu and Alex Hauptmann
yading@10:  * Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
yading@10:  * Copyright (c) 2009 Kenan Gillet
yading@10:  * Copyright (c) 2010 Martin Storsjo
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_G722_H
yading@10: #define AVCODEC_G722_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "avcodec.h"
yading@10: 
yading@10: #define PREV_SAMPLES_BUF_SIZE 1024
yading@10: 
yading@10: typedef struct G722Context {
yading@10:     const AVClass *class;
yading@10:     int     bits_per_codeword;
yading@10:     int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
yading@10:     int     prev_samples_pos;        ///< the number of values in prev_samples
yading@10: 
yading@10:     /**
yading@10:      * The band[0] and band[1] correspond respectively to the lower band and higher band.
yading@10:      */
yading@10:     struct G722Band {
yading@10:         int16_t s_predictor;         ///< predictor output value
yading@10:         int32_t s_zero;              ///< previous output signal from zero predictor
yading@10:         int8_t  part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
yading@10:         int16_t prev_qtzd_reconst;   ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
yading@10:         int16_t pole_mem[2];         ///< second-order pole section coefficient buffer
yading@10:         int32_t diff_mem[6];         ///< quantizer difference signal memory
yading@10:         int16_t zero_mem[6];         ///< Seventh-order zero section coefficient buffer
yading@10:         int16_t log_factor;          ///< delayed 2-logarithmic quantizer factor
yading@10:         int16_t scale_factor;        ///< delayed quantizer scale factor
yading@10:     } band[2];
yading@10: 
yading@10:     struct TrellisNode {
yading@10:         struct G722Band state;
yading@10:         uint32_t ssd;
yading@10:         int path;
yading@10:     } *node_buf[2], **nodep_buf[2];
yading@10: 
yading@10:     struct TrellisPath {
yading@10:         int value;
yading@10:         int prev;
yading@10:     } *paths[2];
yading@10: } G722Context;
yading@10: 
yading@10: extern const int16_t ff_g722_high_inv_quant[4];
yading@10: extern const int16_t ff_g722_low_inv_quant4[16];
yading@10: extern const int16_t ff_g722_low_inv_quant6[64];
yading@10: 
yading@10: void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
yading@10: 
yading@10: void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
yading@10:                                    const int ihigh);
yading@10: 
yading@10: void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
yading@10: 
yading@10: #endif /* AVCODEC_G722_H */