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Diffstat (limited to 'libavcodec/mqc.c')
| -rw-r--r-- | libavcodec/mqc.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libavcodec/mqc.c b/libavcodec/mqc.c new file mode 100644 index 0000000000..700b9574c1 --- /dev/null +++ b/libavcodec/mqc.c @@ -0,0 +1,108 @@ +/* + * 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 ecoder and decoder common functions + * @file + * @author Kamil Nowosad + */ + +#include "mqc.h" + +typedef struct { + uint16_t qe; + uint8_t nmps; + uint8_t nlps; + uint8_t sw; +} MqcCxState; + +const static 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 ff_mqc_init_contexts(MqcState *mqc) +{ + int i; + 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; + + 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; + } +} |