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  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.  
  33. typedef 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.  
  66. extern const int16_t ff_g722_high_inv_quant[4];
  67. extern const int16_t ff_g722_low_inv_quant4[16];
  68. extern const int16_t ff_g722_low_inv_quant6[64];
  69.  
  70. void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
  71.  
  72. void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
  73.                                    const int ihigh);
  74.  
  75. void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
  76.  
  77. #endif /* AVCODEC_G722_H */
  78.