1/* 2 * Copyright (c) CMU 1993 Computer Science, Speech Group 3 * Chengxiang Lu and Alex Hauptmann 4 * Copyright (c) 2005 Steve Underwood <steveu at coppice.org> 5 * Copyright (c) 2009 Kenan Gillet 6 * Copyright (c) 2010 Martin Storsjo 7 * 8 * This file is part of FFmpeg. 9 * 10 * FFmpeg is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * FFmpeg is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with FFmpeg; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25#ifndef AVCODEC_G722_H 26#define AVCODEC_G722_H 27 28#include <stdint.h> 29#include "avcodec.h" 30 31#define PREV_SAMPLES_BUF_SIZE 1024 32 33typedef struct G722Context { 34 const AVClass *class; 35 int bits_per_codeword; 36 int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples 37 int prev_samples_pos; ///< the number of values in prev_samples 38 39 /** 40 * The band[0] and band[1] correspond respectively to the lower band and higher band. 41 */ 42 struct G722Band { 43 int16_t s_predictor; ///< predictor output value 44 int32_t s_zero; ///< previous output signal from zero predictor 45 int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals 46 int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) 47 int16_t pole_mem[2]; ///< second-order pole section coefficient buffer 48 int32_t diff_mem[6]; ///< quantizer difference signal memory 49 int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer 50 int16_t log_factor; ///< delayed 2-logarithmic quantizer factor 51 int16_t scale_factor; ///< delayed quantizer scale factor 52 } band[2]; 53 54 struct TrellisNode { 55 struct G722Band state; 56 uint32_t ssd; 57 int path; 58 } *node_buf[2], **nodep_buf[2]; 59 60 struct TrellisPath { 61 int value; 62 int prev; 63 } *paths[2]; 64} G722Context; 65 66extern const int16_t ff_g722_high_inv_quant[4]; 67extern const int16_t ff_g722_low_inv_quant4[16]; 68extern const int16_t ff_g722_low_inv_quant6[64]; 69 70void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); 71 72void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, 73 const int ihigh); 74 75void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2); 76 77#endif /* AVCODEC_G722_H */ 78