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 #include "g722dsp.h" 31 32 #define PREV_SAMPLES_BUF_SIZE 1024 33 34 typedef struct G722Context { 35 const AVClass *class; 36 int bits_per_codeword; 37 int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples 38 int prev_samples_pos; ///< the number of values in prev_samples 39 40 /** 41 * The band[0] and band[1] correspond respectively to the lower band and higher band. 42 */ 43 struct G722Band { 44 int16_t s_predictor; ///< predictor output value 45 int32_t s_zero; ///< previous output signal from zero predictor 46 int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals 47 int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) 48 int16_t pole_mem[2]; ///< second-order pole section coefficient buffer 49 int32_t diff_mem[6]; ///< quantizer difference signal memory 50 int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer 51 int16_t log_factor; ///< delayed 2-logarithmic quantizer factor 52 int16_t scale_factor; ///< delayed quantizer scale factor 53 } band[2]; 54 55 struct TrellisNode { 56 struct G722Band state; 57 uint32_t ssd; 58 int path; 59 } *node_buf[2], **nodep_buf[2]; 60 61 struct TrellisPath { 62 int value; 63 int prev; 64 } *paths[2]; 65 66 G722DSPContext dsp; 67 } G722Context; 68 69 extern const int16_t ff_g722_high_inv_quant[4]; 70 extern const int16_t ff_g722_low_inv_quant4[16]; 71 extern const int16_t ff_g722_low_inv_quant6[64]; 72 73 void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); 74 75 void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, 76 const int ihigh); 77 78 #endif /* AVCODEC_G722_H */ 79