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  1. /*
  2.  * MQ-coder: structures, common and decoder functions
  3.  * Copyright (c) 2007 Kamil Nowosad
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVCODEC_MQC_H
  23. #define AVCODEC_MQC_H
  24.  
  25. /**
  26.  * MQ-coder
  27.  * @file
  28.  * @author Kamil Nowosad
  29.  */
  30.  
  31. #include <stdint.h>
  32.  
  33. #define MQC_CX_UNI 17
  34. #define MQC_CX_RL  18
  35.  
  36. extern uint16_t ff_mqc_qe[2 * 47];
  37. extern uint8_t  ff_mqc_nlps[2 * 47];
  38. extern uint8_t  ff_mqc_nmps[2 * 47];
  39.  
  40. typedef struct MqcState {
  41.     uint8_t *bp, *bpstart;
  42.     unsigned int a;
  43.     unsigned int c;
  44.     unsigned int ct;
  45.     uint8_t cx_states[19];
  46. } MqcState;
  47.  
  48. /* encoder */
  49.  
  50. /** initialize the encoder */
  51. void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
  52.  
  53. /** code bit d with context cx */
  54. void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
  55.  
  56. /** number of encoded bytes */
  57. int ff_mqc_length(MqcState *mqc);
  58.  
  59. /** flush the encoder [returns number of bytes encoded] */
  60. int ff_mqc_flush(MqcState *mqc);
  61.  
  62. /* decoder */
  63.  
  64. /**
  65.  * Initialize MQ-decoder.
  66.  * @param mqc   MQ decoder state
  67.  * @param bp    byte poiter
  68.  */
  69. void ff_mqc_initdec(MqcState *mqc, uint8_t *bp);
  70.  
  71. /**
  72.  * MQ decoder.
  73.  * @param mqc       MQ decoder state
  74.  * @param cxstate   Context
  75.  * @return          Decision (0 ot 1)
  76.  */
  77. int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
  78.  
  79. /* common */
  80.  
  81. /**
  82.  * MQ-coder Initialize context tables (QE, NLPS, NMPS)
  83.  */
  84. void ff_mqc_init_context_tables(void);
  85.  
  86. /**
  87.  * MQ-coder context initialisations.
  88.  * @param mqc       MQ-coder context
  89.  */
  90. void ff_mqc_init_contexts(MqcState *mqc);
  91.  
  92. #endif /* AVCODEC_MQC_H */
  93.