/* * MQ-coder encoder and decoder common functions * Copyright (c) 2007 Kamil Nowosad * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * MQ-coder common (decoder/encoder) functions * @file * @author Kamil Nowosad */ #include <string.h> #include <stdint.h> #include "libavutil/attributes.h" #include "mqc.h" /* MQ coder context state structure */ typedef struct MqcCxState { uint16_t qe; uint8_t nmps; uint8_t nlps; uint8_t sw; } MqcCxState; static const MqcCxState cx_states[47] = { { 0x5601, 1, 1, 1 }, { 0x3401, 2, 6, 0 }, { 0x1801, 3, 9, 0 }, { 0x0AC1, 4, 12, 0 }, { 0x0521, 5, 29, 0 }, { 0x0221, 38, 33, 0 }, { 0x5601, 7, 6, 1 }, { 0x5401, 8, 14, 0 }, { 0x4801, 9, 14, 0 }, { 0x3801, 10, 14, 0 }, { 0x3001, 11, 17, 0 }, { 0x2401, 12, 18, 0 }, { 0x1C01, 13, 20, 0 }, { 0x1601, 29, 21, 0 }, { 0x5601, 15, 14, 1 }, { 0x5401, 16, 14, 0 }, { 0x5101, 17, 15, 0 }, { 0x4801, 18, 16, 0 }, { 0x3801, 19, 17, 0 }, { 0x3401, 20, 18, 0 }, { 0x3001, 21, 19, 0 }, { 0x2801, 22, 19, 0 }, { 0x2401, 23, 20, 0 }, { 0x2201, 24, 21, 0 }, { 0x1C01, 25, 22, 0 }, { 0x1801, 26, 23, 0 }, { 0x1601, 27, 24, 0 }, { 0x1401, 28, 25, 0 }, { 0x1201, 29, 26, 0 }, { 0x1101, 30, 27, 0 }, { 0x0AC1, 31, 28, 0 }, { 0x09C1, 32, 29, 0 }, { 0x08A1, 33, 30, 0 }, { 0x0521, 34, 31, 0 }, { 0x0441, 35, 32, 0 }, { 0x02A1, 36, 33, 0 }, { 0x0221, 37, 34, 0 }, { 0x0141, 38, 35, 0 }, { 0x0111, 39, 36, 0 }, { 0x0085, 40, 37, 0 }, { 0x0049, 41, 38, 0 }, { 0x0025, 42, 39, 0 }, { 0x0015, 43, 40, 0 }, { 0x0009, 44, 41, 0 }, { 0x0005, 45, 42, 0 }, { 0x0001, 45, 43, 0 }, { 0x5601, 46, 46, 0 } }; uint16_t ff_mqc_qe [2 * 47]; uint8_t ff_mqc_nlps[2 * 47]; uint8_t ff_mqc_nmps[2 * 47]; void av_cold ff_mqc_init_context_tables(void) { int i; for (i = 0; i < 47; i++) { ff_mqc_qe[2 * i] = ff_mqc_qe[2 * i + 1] = cx_states[i].qe; ff_mqc_nlps[2 * i] = 2 * cx_states[i].nlps + cx_states[i].sw; ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw; ff_mqc_nmps[2 * i] = 2 * cx_states[i].nmps; ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1; } } void ff_mqc_init_contexts(MqcState *mqc) { memset(mqc->cx_states, 0, sizeof(mqc->cx_states)); mqc->cx_states[MQC_CX_UNI] = 2 * 46; mqc->cx_states[MQC_CX_RL] = 2 * 3; mqc->cx_states[0] = 2 * 4; }