mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
361 lines
10 KiB
C
361 lines
10 KiB
C
/*
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* ScreenPressor decoder
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*
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* Copyright (c) 2017 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#ifndef AVCODEC_SCPR_H
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#define AVCODEC_SCPR_H
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#include "avcodec.h"
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#include "bytestream.h"
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#include "scpr3.h"
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typedef struct RangeCoder {
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uint32_t code;
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uint32_t range;
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uint32_t code1;
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} RangeCoder;
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typedef struct PixelModel {
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uint32_t freq[256];
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uint32_t lookup[16];
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uint32_t total_freq;
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} PixelModel;
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typedef struct SCPRContext {
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int version;
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AVFrame *last_frame;
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AVFrame *current_frame;
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GetByteContext gb;
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RangeCoder rc;
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PixelModel pixel_model[3][4096];
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uint32_t op_model[6][7];
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uint32_t run_model[6][257];
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uint32_t range_model[257];
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uint32_t count_model[257];
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uint32_t fill_model[6];
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uint32_t sxy_model[4][17];
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uint32_t mv_model[2][513];
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uint32_t nbx, nby;
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uint32_t nbcount;
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uint32_t *blocks;
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uint32_t cbits;
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int cxshift;
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PixelModel3 pixel_model3[3][4096];
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RunModel3 run_model3[6];
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RunModel3 range_model3;
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RunModel3 count_model3;
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FillModel3 fill_model3;
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SxyModel3 sxy_model3[4];
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MVModel3 mv_model3[2];
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OpModel3 op_model3[6];
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int (*get_freq)(RangeCoder *rc, uint32_t total_freq, uint32_t *freq);
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int (*decode)(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq);
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} SCPRContext;
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static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
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int *px, int *py, uint32_t clr, uint32_t *dst,
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int linesize, uint32_t *plx, uint32_t *ply,
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uint32_t backstep, int off, int *cx, int *cx1)
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{
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uint32_t r, g, b;
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int z;
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int x = *px,
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y = *py;
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uint32_t lx = *plx,
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ly = *ply;
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if (y >= avctx->height)
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return AVERROR_INVALIDDATA;
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switch (ptype) {
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case 0:
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while (run-- > 0) {
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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(x)++;
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if (x >= avctx->width) {
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x = 0;
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(y)++;
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if (y >= avctx->height && run)
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return AVERROR_INVALIDDATA;
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}
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}
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break;
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case 1:
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while (run-- > 0) {
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dst[y * linesize + x] = dst[ly * linesize + lx];
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lx = x;
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ly = y;
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(x)++;
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if (x >= avctx->width) {
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x = 0;
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(y)++;
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if (y >= avctx->height && run)
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return AVERROR_INVALIDDATA;
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}
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}
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clr = dst[ly * linesize + lx];
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break;
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case 2:
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if (y < 1)
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return AVERROR_INVALIDDATA;
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while (run-- > 0) {
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clr = dst[y * linesize + x + off + 1];
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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(x)++;
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if (x >= avctx->width) {
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x = 0;
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(y)++;
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if (y >= avctx->height && run)
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return AVERROR_INVALIDDATA;
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}
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}
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break;
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case 4:
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if (y < 1 || (y == 1 && x == 0))
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return AVERROR_INVALIDDATA;
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while (run-- > 0) {
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uint8_t *odst = (uint8_t *)dst;
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int off1 = (ly * linesize + lx) * 4;
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int off2 = ((y * linesize + x) + off) * 4;
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if (x == 0) {
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z = backstep * 4;
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} else {
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z = 0;
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}
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r = odst[off1] +
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odst[off2 + 4] -
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odst[off2 - z ];
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g = odst[off1 + 1] +
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odst[off2 + 5] -
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odst[off2 - z + 1];
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b = odst[off1 + 2] +
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odst[off2 + 6] -
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odst[off2 - z + 2];
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clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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(x)++;
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if (x >= avctx->width) {
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x = 0;
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(y)++;
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if (y >= avctx->height && run)
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return AVERROR_INVALIDDATA;
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}
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}
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break;
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case 5:
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if (y < 1 || (y == 1 && x == 0))
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return AVERROR_INVALIDDATA;
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while (run-- > 0) {
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if (x == 0) {
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z = backstep;
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} else {
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z = 0;
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}
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clr = dst[y * linesize + x + off - z];
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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(x)++;
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if (x >= avctx->width) {
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x = 0;
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(y)++;
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if (y >= avctx->height && run)
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return AVERROR_INVALIDDATA;
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}
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}
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break;
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}
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*px = x;
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*py = y;
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*plx= lx;
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*ply= ly;
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if (avctx->bits_per_coded_sample == 16) {
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*cx1 = (clr & 0x3F00) >> 2;
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*cx = (clr & 0x3FFFFF) >> 16;
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} else {
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*cx1 = (clr & 0xFC00) >> 4;
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*cx = (clr & 0xFFFFFF) >> 18;
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}
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return 0;
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}
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static int decode_run_p(AVCodecContext *avctx, uint32_t ptype, int run,
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int x, int y, uint32_t clr,
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uint32_t *dst, uint32_t *prev,
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int linesize, int plinesize,
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uint32_t *bx, uint32_t *by,
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uint32_t backstep, int sx1, int sx2,
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int *cx, int *cx1)
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{
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uint32_t r, g, b;
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int z;
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switch (ptype) {
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case 0:
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while (run-- > 0) {
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if (*by >= avctx->height)
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return AVERROR_INVALIDDATA;
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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case 1:
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while (run-- > 0) {
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if (*bx == 0) {
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if (*by < 1)
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return AVERROR_INVALIDDATA;
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z = backstep;
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} else {
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z = 0;
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}
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if (*by >= avctx->height)
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return AVERROR_INVALIDDATA;
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clr = dst[*by * linesize + *bx - 1 - z];
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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case 2:
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while (run-- > 0) {
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if (*by < 1 || *by >= avctx->height)
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return AVERROR_INVALIDDATA;
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clr = dst[(*by - 1) * linesize + *bx];
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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case 3:
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while (run-- > 0) {
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if (*by >= avctx->height)
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return AVERROR_INVALIDDATA;
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clr = prev[*by * plinesize + *bx];
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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case 4:
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while (run-- > 0) {
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uint8_t *odst = (uint8_t *)dst;
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if (*by < 1 || *by >= avctx->height)
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return AVERROR_INVALIDDATA;
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if (*bx == 0) {
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if (*by < 2)
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return AVERROR_INVALIDDATA;
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z = backstep;
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} else {
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z = 0;
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}
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r = odst[((*by - 1) * linesize + *bx) * 4] +
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odst[(*by * linesize + *bx - 1 - z) * 4] -
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odst[((*by - 1) * linesize + *bx - 1 - z) * 4];
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g = odst[((*by - 1) * linesize + *bx) * 4 + 1] +
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odst[(*by * linesize + *bx - 1 - z) * 4 + 1] -
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odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 1];
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b = odst[((*by - 1) * linesize + *bx) * 4 + 2] +
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odst[(*by * linesize + *bx - 1 - z) * 4 + 2] -
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odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 2];
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clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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case 5:
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while (run-- > 0) {
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if (*by < 1 || *by >= avctx->height)
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return AVERROR_INVALIDDATA;
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if (*bx == 0) {
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if (*by < 2)
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return AVERROR_INVALIDDATA;
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z = backstep;
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} else {
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z = 0;
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}
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clr = dst[(*by - 1) * linesize + *bx - 1 - z];
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dst[*by * linesize + *bx] = clr;
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(*bx)++;
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if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
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*bx = x * 16 + sx1;
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(*by)++;
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}
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}
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break;
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}
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if (avctx->bits_per_coded_sample == 16) {
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*cx1 = (clr & 0x3F00) >> 2;
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*cx = (clr & 0x3FFFFF) >> 16;
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} else {
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*cx1 = (clr & 0xFC00) >> 4;
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*cx = (clr & 0xFFFFFF) >> 18;
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}
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return 0;
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}
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#endif /* AVCODEC_SCPR_H */
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