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avcodec/scpr: add version 3 support

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-05-27 14:28:08 +02:00
parent 80ce23da65
commit a064530da8
4 changed files with 1696 additions and 308 deletions
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366
libavcodec/scpr.c
View File

@ -27,44 +27,13 @@
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "scpr.h"
#include "scpr3.h"
#define TOP 0x01000000
#define BOT 0x010000
typedef struct RangeCoder {
unsigned code;
unsigned range;
unsigned code1;
} RangeCoder;
typedef struct PixelModel {
unsigned freq[256];
unsigned lookup[16];
unsigned total_freq;
} PixelModel;
typedef struct SCPRContext {
AVFrame *last_frame;
AVFrame *current_frame;
GetByteContext gb;
RangeCoder rc;
PixelModel pixel_model[3][4096];
unsigned op_model[6][7];
unsigned run_model[6][257];
unsigned range_model[257];
unsigned count_model[257];
unsigned fill_model[6];
unsigned sxy_model[4][17];
unsigned mv_model[2][513];
unsigned nbx, nby;
unsigned nbcount;
unsigned *blocks;
unsigned cbits;
int cxshift;
int (*get_freq)(RangeCoder *rc, unsigned total_freq, unsigned *freq);
int (*decode)(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq);
} SCPRContext;
#include "scpr3.c"
static void init_rangecoder(RangeCoder *rc, GetByteContext *gb)
{
@ -90,14 +59,14 @@ static void reinit_tables(SCPRContext *s)
}
for (j = 0; j < 6; j++) {
unsigned *p = s->run_model[j];
uint32_t *p = s->run_model[j];
for (i = 0; i < 256; i++)
p[i] = 1;
p[256] = 256;
}
for (j = 0; j < 6; j++) {
unsigned *op = s->op_model[j];
uint32_t *op = s->op_model[j];
for (i = 0; i < 6; i++)
op[i] = 1;
op[6] = 6;
@ -130,13 +99,13 @@ static void reinit_tables(SCPRContext *s)
s->mv_model[1][512] = 512;
}
static int decode(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq)
static int decode(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq)
{
rc->code -= cumFreq * rc->range;
rc->range *= freq;
while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
unsigned byte = bytestream2_get_byteu(gb);
uint32_t byte = bytestream2_get_byteu(gb);
rc->code = (rc->code << 8) | byte;
rc->range <<= 8;
}
@ -144,7 +113,7 @@ static int decode(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned
return 0;
}
static int get_freq(RangeCoder *rc, unsigned total_freq, unsigned *freq)
static int get_freq(RangeCoder *rc, uint32_t total_freq, uint32_t *freq)
{
if (total_freq == 0)
return AVERROR_INVALIDDATA;
@ -159,9 +128,9 @@ static int get_freq(RangeCoder *rc, unsigned total_freq, unsigned *freq)
return 0;
}
static int decode0(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq)
static int decode0(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq)
{
unsigned t;
uint32_t t;
if (total_freq == 0)
return AVERROR_INVALIDDATA;
@ -172,7 +141,7 @@ static int decode0(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigne
rc->range = rc->range * (uint64_t)(freq + cumFreq) / total_freq - (t + 1);
while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
unsigned byte = bytestream2_get_byteu(gb);
uint32_t byte = bytestream2_get_byteu(gb);
rc->code = (rc->code << 8) | byte;
rc->code1 <<= 8;
rc->range <<= 8;
@ -181,7 +150,7 @@ static int decode0(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigne
return 0;
}
static int get_freq0(RangeCoder *rc, unsigned total_freq, unsigned *freq)
static int get_freq0(RangeCoder *rc, uint32_t total_freq, uint32_t *freq)
{
if (rc->range == 0)
return AVERROR_INVALIDDATA;
@ -191,13 +160,13 @@ static int get_freq0(RangeCoder *rc, unsigned total_freq, unsigned *freq)
return 0;
}
static int decode_value(SCPRContext *s, unsigned *cnt, unsigned maxc, unsigned step, unsigned *rval)
static int decode_value(SCPRContext *s, uint32_t *cnt, uint32_t maxc, uint32_t step, uint32_t *rval)
{
GetByteContext *gb = &s->gb;
RangeCoder *rc = &s->rc;
unsigned totfr = cnt[maxc];
unsigned value;
unsigned c = 0, cumfr = 0, cnt_c = 0;
uint32_t totfr = cnt[maxc];
uint32_t value;
uint32_t c = 0, cumfr = 0, cnt_c = 0;
int i, ret;
if ((ret = s->get_freq(rc, totfr, &value)) < 0)
@ -223,7 +192,7 @@ static int decode_value(SCPRContext *s, unsigned *cnt, unsigned maxc, unsigned s
if (totfr > BOT) {
totfr = 0;
for (i = 0; i < maxc; i++) {
unsigned nc = (cnt[i] >> 1) + 1;
uint32_t nc = (cnt[i] >> 1) + 1;
cnt[i] = nc;
totfr += nc;
}
@ -235,12 +204,12 @@ static int decode_value(SCPRContext *s, unsigned *cnt, unsigned maxc, unsigned s
return 0;
}
static int decode_unit(SCPRContext *s, PixelModel *pixel, unsigned step, unsigned *rval)
static int decode_unit(SCPRContext *s, PixelModel *pixel, uint32_t step, uint32_t *rval)
{
GetByteContext *gb = &s->gb;
RangeCoder *rc = &s->rc;
unsigned totfr = pixel->total_freq;
unsigned value, x = 0, cumfr = 0, cnt_x = 0;
uint32_t totfr = pixel->total_freq;
uint32_t value, x = 0, cumfr = 0, cnt_x = 0;
int i, j, ret, c, cnt_c;
if ((ret = s->get_freq(rc, totfr, &value)) < 0)
@ -278,13 +247,13 @@ static int decode_unit(SCPRContext *s, PixelModel *pixel, unsigned step, unsigne
if (totfr > BOT) {
totfr = 0;
for (i = 0; i < 256; i++) {
unsigned nc = (pixel->freq[i] >> 1) + 1;
uint32_t nc = (pixel->freq[i] >> 1) + 1;
pixel->freq[i] = nc;
totfr += nc;
}
for (i = 0; i < 16; i++) {
unsigned sum = 0;
unsigned i16_17 = i << 4;
uint32_t sum = 0;
uint32_t i16_17 = i << 4;
for (j = 0; j < 16; j++)
sum += pixel->freq[i16_17 + j];
pixel->lookup[i] = sum;
@ -297,7 +266,7 @@ static int decode_unit(SCPRContext *s, PixelModel *pixel, unsigned step, unsigne
return 0;
}
static int decode_units(SCPRContext *s, unsigned *r, unsigned *g, unsigned *b,
static int decode_units(SCPRContext *s, uint32_t *r, uint32_t *g, uint32_t *b,
int *cx, int *cx1)
{
const int cxshift = s->cxshift;
@ -329,10 +298,10 @@ static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
{
SCPRContext *s = avctx->priv_data;
GetByteContext *gb = &s->gb;
int cx = 0, cx1 = 0, k = 0, clr = 0;
int run, off, y = 0, x = 0, z, ret;
unsigned r, g, b, backstep = linesize - avctx->width;
unsigned lx, ly, ptype;
int cx = 0, cx1 = 0, k = 0;
int run, off, y = 0, x = 0, ret;
uint32_t clr = 0, r, g, b, backstep = linesize - avctx->width;
uint32_t lx, ly, ptype;
reinit_tables(s);
bytestream2_skip(gb, 2);
@ -387,120 +356,11 @@ static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
if (run <= 0)
return AVERROR_INVALIDDATA;
switch (ptype) {
case 0:
while (run-- > 0) {
if (y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[y * linesize + x] = clr;
lx = x;
ly = y;
x++;
if (x >= avctx->width) {
x = 0;
y++;
}
}
break;
case 1:
while (run-- > 0) {
if (y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[y * linesize + x] = dst[ly * linesize + lx];
lx = x;
ly = y;
x++;
if (x >= avctx->width) {
x = 0;
y++;
}
}
clr = dst[ly * linesize + lx];
break;
case 2:
while (run-- > 0) {
if (y < 1 || y >= avctx->height)
return AVERROR_INVALIDDATA;
clr = dst[y * linesize + x + off + 1];
dst[y * linesize + x] = clr;
lx = x;
ly = y;
x++;
if (x >= avctx->width) {
x = 0;
y++;
}
}
break;
case 4:
while (run-- > 0) {
uint8_t *odst = (uint8_t *)dst;
if (y < 1 || y >= avctx->height ||
(y == 1 && x == 0))
return AVERROR_INVALIDDATA;
if (x == 0) {
z = backstep;
} else {
z = 0;
}
r = odst[(ly * linesize + lx) * 4] +
odst[((y * linesize + x) + off) * 4 + 4] -
odst[((y * linesize + x) + off - z) * 4];
g = odst[(ly * linesize + lx) * 4 + 1] +
odst[((y * linesize + x) + off) * 4 + 5] -
odst[((y * linesize + x) + off - z) * 4 + 1];
b = odst[(ly * linesize + lx) * 4 + 2] +
odst[((y * linesize + x) + off) * 4 + 6] -
odst[((y * linesize + x) + off - z) * 4 + 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++;
}
}
break;
case 5:
while (run-- > 0) {
if (y < 1 || y >= avctx->height ||
(y == 1 && x == 0))
return AVERROR_INVALIDDATA;
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++;
}
}
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;
}
ret = decode_run_i(avctx, ptype, run, &x, &y, clr,
dst, linesize, &lx, &ly,
backstep, off, &cx, &cx1);
if (run < 0)
return ret;
}
return 0;
@ -589,8 +449,8 @@ static int decompress_p(AVCodecContext *avctx,
}
}
} else {
int run, z, bx = x * 16 + sx1, by = y * 16 + sy1;
unsigned r, g, b, clr, ptype = 0;
int run, bx = x * 16 + sx1, by = y * 16 + sy1;
uint32_t r, g, b, clr, ptype = 0;
for (; by < y * 16 + sy2 && by < avctx->height;) {
ret = decode_value(s, s->op_model[ptype], 6, 1000, &ptype);
@ -611,134 +471,11 @@ static int decompress_p(AVCodecContext *avctx,
if (run <= 0)
return AVERROR_INVALIDDATA;
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;
}
ret = decode_run_p(avctx, ptype, run, x, y, clr,
dst, prev, linesize, plinesize, &bx, &by,
backstep, sx1, sx2, &cx, &cx1);
if (ret < 0)
return ret;
}
}
}
@ -768,18 +505,25 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
type = bytestream2_peek_byte(gb);
if (type == 2) {
s->version = 1;
s->get_freq = get_freq0;
s->decode = decode0;
frame->key_frame = 1;
ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4);
} else if (type == 18) {
s->version = 2;
s->get_freq = get_freq;
s->decode = decode;
frame->key_frame = 1;
ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4);
} else if (type == 17) {
} else if (type == 34) {
frame->key_frame = 1;
s->version = 3;
ret = decompress_i3(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4);
} else if (type == 17 || type == 33) {
uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0];
int x, y;
@ -809,10 +553,16 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if (ret < 0)
return ret;
ret = decompress_p(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4,
(uint32_t *)s->last_frame->data[0],
s->last_frame->linesize[0] / 4);
if (s->version == 1 || s->version == 2)
ret = decompress_p(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4,
(uint32_t *)s->last_frame->data[0],
s->last_frame->linesize[0] / 4);
else
ret = decompress_p3(avctx, (uint32_t *)s->current_frame->data[0],
s->current_frame->linesize[0] / 4,
(uint32_t *)s->last_frame->data[0],
s->last_frame->linesize[0] / 4);
if (ret == 1)
return avpkt->size;
} else {

349
libavcodec/scpr.h Normal file
View File

@ -0,0 +1,349 @@
/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "internal.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 *x, int *y, uint32_t clr, uint32_t *dst,
int linesize, uint32_t *lx, uint32_t *ly,
uint32_t backstep, int off, int *cx, int *cx1)
{
uint32_t r, g, b;
int z;
switch (ptype) {
case 0:
while (run-- > 0) {
if (*y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
case 1:
while (run-- > 0) {
if (*y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[*y * linesize + *x] = dst[*ly * linesize + *lx];
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
clr = dst[*ly * linesize + *lx];
break;
case 2:
while (run-- > 0) {
if (*y < 1 || *y >= avctx->height)
return AVERROR_INVALIDDATA;
clr = dst[*y * linesize + *x + off + 1];
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
case 4:
while (run-- > 0) {
uint8_t *odst = (uint8_t *)dst;
if (*y < 1 || *y >= avctx->height ||
(*y == 1 && *x == 0))
return AVERROR_INVALIDDATA;
if (*x == 0) {
z = backstep;
} else {
z = 0;
}
r = odst[(*ly * linesize + *lx) * 4] +
odst[((*y * linesize + *x) + off) * 4 + 4] -
odst[((*y * linesize + *x) + off - z) * 4];
g = odst[(*ly * linesize + *lx) * 4 + 1] +
odst[((*y * linesize + *x) + off) * 4 + 5] -
odst[((*y * linesize + *x) + off - z) * 4 + 1];
b = odst[(*ly * linesize + *lx) * 4 + 2] +
odst[((*y * linesize + *x) + off) * 4 + 6] -
odst[((*y * linesize + *x) + off - z) * 4 + 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)++;
}
}
break;
case 5:
while (run-- > 0) {
if (*y < 1 || *y >= avctx->height ||
(*y == 1 && *x == 0))
return AVERROR_INVALIDDATA;
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)++;
}
}
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;
}
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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/*
* ScreenPressor version 3 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_SCPR3_H
#define AVCODEC_SCPR3_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "internal.h"
typedef struct PixelModel3 {
uint8_t type;
uint8_t length;
uint8_t maxpos;
uint8_t fshift;
uint16_t size;
uint32_t cntsum;
uint8_t symbols[256];
uint16_t freqs[256];
uint16_t freqs1[256];
uint16_t cnts[256];
uint8_t dectab[32];
} PixelModel3;
typedef struct FillModel3 {
uint32_t cntsum;
uint16_t freqs[2][5];
uint16_t cnts[5];
uint8_t dectab[32];
} FillModel3;
typedef struct OpModel3 {
uint32_t cntsum;
uint16_t freqs[2][6];
uint16_t cnts[6];
uint8_t dectab[32];
} OpModel3;
typedef struct RunModel3 {
uint32_t cntsum;
uint16_t freqs[2][256];
uint16_t cnts[256];
uint8_t dectab[32];
} RunModel3;
typedef struct SxyModel3 {
uint32_t cntsum;
uint16_t freqs[2][16];
uint16_t cnts[16];
uint8_t dectab[32];
} SxyModel3;
typedef struct MVModel3 {
uint32_t cntsum;
uint16_t freqs[2][512];
uint16_t cnts[512];
uint8_t dectab[32];
} MVModel3;
#endif /* AVCODEC_SCPR3_H */