84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
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/*
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* Copyright (c) 2012 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Common header for Microsoft Screen 1 and 2
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*/
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#ifndef AVCODEC_MSS12_H
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#define AVCODEC_MSS12_H
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#include "avcodec.h"
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#include "get_bits.h"
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#define MODEL_MIN_SYMS 2
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#define MODEL_MAX_SYMS 256
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#define THRESH_ADAPTIVE -1
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#define THRESH_LOW 15
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#define THRESH_HIGH 50
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typedef struct Model {
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int cum_prob[MODEL_MAX_SYMS + 1];
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int weights[MODEL_MAX_SYMS + 1];
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int idx2sym[MODEL_MAX_SYMS + 1];
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int sym2idx[MODEL_MAX_SYMS + 1];
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int num_syms;
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int thr_weight, threshold;
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} Model;
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typedef struct ArithCoder {
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int low, high, value;
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GetBitContext *gb;
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int (*get_model_sym)(struct ArithCoder *c, Model *m);
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int (*get_number) (struct ArithCoder *c, int n);
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} ArithCoder;
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typedef struct PixContext {
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int cache_size, num_syms;
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uint8_t cache[12];
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Model cache_model, full_model;
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Model sec_models[4][8][4];
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} PixContext;
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typedef struct MSS12Context {
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AVCodecContext *avctx;
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uint8_t *pic_start;
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int pic_stride;
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uint8_t *mask;
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int mask_linesize;
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uint32_t pal[256];
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int free_colours;
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int keyframe;
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Model intra_region, inter_region;
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Model pivot, edge_mode, split_mode;
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PixContext intra_pix_ctx, inter_pix_ctx;
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int corrupted;
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} MSS12Context;
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int ff_mss12_decode_rect(MSS12Context *ctx, ArithCoder *acoder,
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int x, int y, int width, int height);
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void ff_mss12_model_update(Model *m, int val);
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void ff_mss12_codec_reset(MSS12Context *ctx);
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av_cold int ff_mss12_decode_init(AVCodecContext *avctx, int version);
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av_cold int ff_mss12_decode_end(AVCodecContext *avctx);
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#endif /* AVCODEC_MSS12_H */
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