PageRenderTime 24ms CodeModel.GetById 15ms app.highlight 6ms RepoModel.GetById 1ms app.codeStats 1ms

/libavcodec/mqc.c

http://github.com/FFmpeg/FFmpeg
C | 117 lines | 81 code | 10 blank | 26 comment | 1 complexity | 796794841553c5d1e5dd8cd1ba5a3aaf MD5 | raw file
  1/*
  2 * MQ-coder encoder and decoder common 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/**
 23 * MQ-coder common (decoder/encoder) functions
 24 * @file
 25 * @author Kamil Nowosad
 26 */
 27
 28#include <string.h>
 29#include <stdint.h>
 30
 31#include "libavutil/attributes.h"
 32
 33#include "mqc.h"
 34
 35/* MQ coder context state structure */
 36typedef struct MqcCxState {
 37    uint16_t qe;
 38    uint8_t  nmps;
 39    uint8_t  nlps;
 40    uint8_t  sw;
 41} MqcCxState;
 42
 43static const MqcCxState cx_states[47] = {
 44    { 0x5601,  1,  1, 1 },
 45    { 0x3401,  2,  6, 0 },
 46    { 0x1801,  3,  9, 0 },
 47    { 0x0AC1,  4, 12, 0 },
 48    { 0x0521,  5, 29, 0 },
 49    { 0x0221, 38, 33, 0 },
 50    { 0x5601,  7,  6, 1 },
 51    { 0x5401,  8, 14, 0 },
 52    { 0x4801,  9, 14, 0 },
 53    { 0x3801, 10, 14, 0 },
 54    { 0x3001, 11, 17, 0 },
 55    { 0x2401, 12, 18, 0 },
 56    { 0x1C01, 13, 20, 0 },
 57    { 0x1601, 29, 21, 0 },
 58    { 0x5601, 15, 14, 1 },
 59    { 0x5401, 16, 14, 0 },
 60    { 0x5101, 17, 15, 0 },
 61    { 0x4801, 18, 16, 0 },
 62    { 0x3801, 19, 17, 0 },
 63    { 0x3401, 20, 18, 0 },
 64    { 0x3001, 21, 19, 0 },
 65    { 0x2801, 22, 19, 0 },
 66    { 0x2401, 23, 20, 0 },
 67    { 0x2201, 24, 21, 0 },
 68    { 0x1C01, 25, 22, 0 },
 69    { 0x1801, 26, 23, 0 },
 70    { 0x1601, 27, 24, 0 },
 71    { 0x1401, 28, 25, 0 },
 72    { 0x1201, 29, 26, 0 },
 73    { 0x1101, 30, 27, 0 },
 74    { 0x0AC1, 31, 28, 0 },
 75    { 0x09C1, 32, 29, 0 },
 76    { 0x08A1, 33, 30, 0 },
 77    { 0x0521, 34, 31, 0 },
 78    { 0x0441, 35, 32, 0 },
 79    { 0x02A1, 36, 33, 0 },
 80    { 0x0221, 37, 34, 0 },
 81    { 0x0141, 38, 35, 0 },
 82    { 0x0111, 39, 36, 0 },
 83    { 0x0085, 40, 37, 0 },
 84    { 0x0049, 41, 38, 0 },
 85    { 0x0025, 42, 39, 0 },
 86    { 0x0015, 43, 40, 0 },
 87    { 0x0009, 44, 41, 0 },
 88    { 0x0005, 45, 42, 0 },
 89    { 0x0001, 45, 43, 0 },
 90    { 0x5601, 46, 46, 0 }
 91};
 92
 93uint16_t ff_mqc_qe [2 * 47];
 94uint8_t ff_mqc_nlps[2 * 47];
 95uint8_t ff_mqc_nmps[2 * 47];
 96
 97void av_cold ff_mqc_init_context_tables(void)
 98{
 99    int i;
100    for (i = 0; i < 47; i++) {
101        ff_mqc_qe[2 * i]     =
102        ff_mqc_qe[2 * i + 1] = cx_states[i].qe;
103
104        ff_mqc_nlps[2 * i]     = 2 * cx_states[i].nlps + cx_states[i].sw;
105        ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw;
106        ff_mqc_nmps[2 * i]     = 2 * cx_states[i].nmps;
107        ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1;
108    }
109}
110
111void ff_mqc_init_contexts(MqcState *mqc)
112{
113    memset(mqc->cx_states, 0, sizeof(mqc->cx_states));
114    mqc->cx_states[MQC_CX_UNI] = 2 * 46;
115    mqc->cx_states[MQC_CX_RL]  = 2 * 3;
116    mqc->cx_states[0]          = 2 * 4;
117}