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