From 0de4a563e4f301c1abc2032d5c13c3cbb39e430c Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sun, 26 Aug 2012 14:16:07 +0200 Subject: mss1: move code that will be reused by MSS2 decoder into separate file --- libavcodec/mss12.h | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 libavcodec/mss12.h (limited to 'libavcodec/mss12.h') diff --git a/libavcodec/mss12.h b/libavcodec/mss12.h new file mode 100644 index 0000000000..383d86c904 --- /dev/null +++ b/libavcodec/mss12.h @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2012 Konstantin Shishkov + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Common header for Microsoft Screen 1 and 2 + */ + +#ifndef AVCODEC_MSS12_H +#define AVCODEC_MSS12_H + +#include "avcodec.h" +#include "get_bits.h" + +#define MODEL_MIN_SYMS 2 +#define MODEL_MAX_SYMS 256 +#define THRESH_ADAPTIVE -1 +#define THRESH_LOW 15 +#define THRESH_HIGH 50 + +typedef struct Model { + int cum_prob[MODEL_MAX_SYMS + 1]; + int weights[MODEL_MAX_SYMS + 1]; + int idx2sym[MODEL_MAX_SYMS + 1]; + int sym2idx[MODEL_MAX_SYMS + 1]; + int num_syms; + int thr_weight, threshold; +} Model; + +typedef struct ArithCoder { + int low, high, value; + GetBitContext *gb; + int (*get_model_sym)(struct ArithCoder *c, Model *m); + int (*get_number) (struct ArithCoder *c, int n); +} ArithCoder; + +typedef struct PixContext { + int cache_size, num_syms; + uint8_t cache[12]; + Model cache_model, full_model; + Model sec_models[4][8][4]; +} PixContext; + +typedef struct MSS12Context { + AVCodecContext *avctx; + uint8_t *pic_start; + int pic_stride; + uint8_t *mask; + int mask_linesize; + uint32_t pal[256]; + int free_colours; + int keyframe; + Model intra_region, inter_region; + Model pivot, edge_mode, split_mode; + PixContext intra_pix_ctx, inter_pix_ctx; + int corrupted; +} MSS12Context; + +int ff_mss12_decode_rect(MSS12Context *ctx, ArithCoder *acoder, + int x, int y, int width, int height); +void ff_mss12_model_update(Model *m, int val); +void ff_mss12_codec_reset(MSS12Context *ctx); +av_cold int ff_mss12_decode_init(AVCodecContext *avctx, int version); +av_cold int ff_mss12_decode_end(AVCodecContext *avctx); + +#endif /* AVCODEC_MSS12_H */ -- cgit v1.2.3