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/*
* Copyright (c) 2012 Konstantin Shishkov
* |
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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
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* |
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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
* 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 |
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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
*/
/**
* @file
* Common functions for Microsoft Screen 1 and 2
*/
|
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#include <inttypes.h>
|
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#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "mss12.h"
enum SplitMode {
SPLIT_VERT = 0,
SPLIT_HOR,
SPLIT_NONE
};
static const int sec_order_sizes[4] = { 1, 7, 6, 1 };
enum ContextDirection {
TOP_LEFT = 0,
TOP,
TOP_RIGHT,
LEFT
};
static int model_calc_threshold(Model *m)
{
int thr;
|
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thr = 2 * m->weights[m->num_syms] - 1;
thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr; |
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return FFMIN(thr, 0x3FFF);
}
static void model_reset(Model *m)
{
int i;
for (i = 0; i <= m->num_syms; i++) {
m->weights[i] = 1;
m->cum_prob[i] = m->num_syms - i;
} |
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m->weights[0] = 0;
for (i = 0; i < m->num_syms; i++) |
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m->idx2sym[i + 1] = i;
}
static av_cold void model_init(Model *m, int num_syms, int thr_weight)
{
m->num_syms = num_syms;
m->thr_weight = thr_weight; |
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m->threshold = num_syms * thr_weight; |
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}
static void model_rescale_weights(Model *m)
{
int i;
int cum_prob;
|
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if (m->thr_weight == THRESH_ADAPTIVE) |
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m->threshold = model_calc_threshold(m);
while (m->cum_prob[0] > m->threshold) {
cum_prob = 0;
for (i = m->num_syms; i >= 0; i--) {
m->cum_prob[i] = cum_prob;
m->weights[i] = (m->weights[i] + 1) >> 1;
cum_prob += m->weights[i];
}
}
}
void ff_mss12_model_update(Model *m, int val)
{
int i;
if (m->weights[val] == m->weights[val - 1]) {
for (i = val; m->weights[i - 1] == m->weights[val]; i--);
if (i != val) {
int sym1, sym2;
sym1 = m->idx2sym[val];
sym2 = m->idx2sym[i];
m->idx2sym[val] = sym2;
m->idx2sym[i] = sym1;
val = i;
}
}
m->weights[val]++;
for (i = val - 1; i >= 0; i--)
m->cum_prob[i]++;
model_rescale_weights(m);
}
static void pixctx_reset(PixContext *ctx)
{ |
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int i, j; |
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|
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if (!ctx->special_initial_cache)
for (i = 0; i < ctx->cache_size; i++)
ctx->cache[i] = i;
else {
ctx->cache[0] = 1;
ctx->cache[1] = 2;
ctx->cache[2] = 4;
} |
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model_reset(&ctx->cache_model);
model_reset(&ctx->full_model);
|
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for (i = 0; i < 15; i++)
for (j = 0; j < 4; j++)
model_reset(&ctx->sec_models[i][j]); |
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}
|
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static av_cold void pixctx_init(PixContext *ctx, int cache_size,
int full_model_syms, int special_initial_cache) |
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{ |
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int i, j, k, idx; |
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|
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ctx->cache_size = cache_size + 4;
ctx->num_syms = cache_size;
ctx->special_initial_cache = special_initial_cache; |
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model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW); |
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model_init(&ctx->full_model, full_model_syms, THRESH_HIGH); |
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|
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for (i = 0, idx = 0; i < 4; i++)
for (j = 0; j < sec_order_sizes[i]; j++, idx++) |
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for (k = 0; k < 4; k++) |
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model_init(&ctx->sec_models[idx][k], 2 + i, |
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i ? THRESH_LOW : THRESH_ADAPTIVE);
}
|
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static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
uint8_t *ngb, int num_ngb, int any_ngb) |
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{
int i, val, pix;
|
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if (acoder->overread > MAX_OVERREAD)
return AVERROR_INVALIDDATA; |
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val = acoder->get_model_sym(acoder, &pctx->cache_model);
if (val < pctx->num_syms) { |
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if (any_ngb) {
int idx, j;
idx = 0;
for (i = 0; i < pctx->cache_size; i++) {
for (j = 0; j < num_ngb; j++)
if (pctx->cache[i] == ngb[j])
break;
if (j == num_ngb) {
if (idx == val)
break;
idx++;
} |
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} |
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val = FFMIN(i, pctx->cache_size - 1); |
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}
pix = pctx->cache[val];
} else {
pix = acoder->get_model_sym(acoder, &pctx->full_model);
for (i = 0; i < pctx->cache_size - 1; i++)
if (pctx->cache[i] == pix)
break;
val = i;
}
if (val) {
for (i = val; i > 0; i--)
pctx->cache[i] = pctx->cache[i - 1];
pctx->cache[0] = pix;
}
return pix;
}
static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx, |
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uint8_t *src, ptrdiff_t stride, int x, int y, |
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int has_right)
{
uint8_t neighbours[4];
uint8_t ref_pix[4];
int nlen;
int layer = 0, sub;
int pix;
int i, j;
if (!y) {
memset(neighbours, src[-1], 4);
} else {
neighbours[TOP] = src[-stride];
if (!x) {
neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP];
} else {
neighbours[TOP_LEFT] = src[-stride - 1];
neighbours[ LEFT] = src[-1];
}
if (has_right)
neighbours[TOP_RIGHT] = src[-stride + 1];
else
neighbours[TOP_RIGHT] = neighbours[TOP];
}
sub = 0;
if (x >= 2 && src[-2] == neighbours[LEFT])
sub = 1;
if (y >= 2 && src[-2 * stride] == neighbours[TOP])
sub |= 2;
nlen = 1;
ref_pix[0] = neighbours[0];
for (i = 1; i < 4; i++) {
for (j = 0; j < nlen; j++)
if (ref_pix[j] == neighbours[i])
break;
if (j == nlen)
ref_pix[nlen++] = neighbours[i];
}
switch (nlen) {
case 1:
layer = 0;
break;
case 2:
if (neighbours[TOP] == neighbours[TOP_LEFT]) {
if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) |
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layer = 1; |
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else if (neighbours[LEFT] == neighbours[TOP_LEFT])
layer = 2;
else |
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layer = 3; |
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} else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
if (neighbours[LEFT] == neighbours[TOP_LEFT]) |
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layer = 4; |
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else
layer = 5;
} else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
layer = 6;
} else { |
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layer = 7; |
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}
break;
case 3:
if (neighbours[TOP] == neighbours[TOP_LEFT]) |
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layer = 8; |
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else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) |
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layer = 9; |
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else if (neighbours[LEFT] == neighbours[TOP_LEFT]) |
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layer = 10; |
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else if (neighbours[TOP_RIGHT] == neighbours[TOP]) |
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layer = 11; |
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else if (neighbours[TOP] == neighbours[LEFT]) |
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layer = 12; |
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else |
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layer = 13;
break;
case 4:
layer = 14; |
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break;
}
|
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pix = acoder->get_model_sym(acoder, |
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&pctx->sec_models[layer][sub]); |
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if (pix < nlen)
return ref_pix[pix];
else |
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return decode_pixel(acoder, pctx, ref_pix, nlen, 1); |
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}
|
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static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic, |
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int x, int y, int width, int height, ptrdiff_t stride,
ptrdiff_t rgb_stride, PixContext *pctx,
const uint32_t *pal) |
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{ |
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int i, j, p;
uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride; |
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dst += x + y * stride;
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) {
if (!i && !j) |
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p = decode_pixel(acoder, pctx, NULL, 0, 0); |
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else
p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
i, j, width - i - 1); |
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if (p < 0)
return p; |
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dst[i] = p; |
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|
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if (rgb_pic)
AV_WB24(rgb_dst + i * 3, pal[p]); |
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} |
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dst += stride;
rgb_dst += rgb_stride; |
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}
return 0;
}
|
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static void copy_rectangles(MSS12Context const *c,
int x, int y, int width, int height)
{
int j;
if (c->last_rgb_pic)
for (j = y; j < y + height; j++) {
memcpy(c->rgb_pic + j * c->rgb_stride + x * 3,
c->last_rgb_pic + j * c->rgb_stride + x * 3,
width * 3);
memcpy(c->pal_pic + j * c->pal_stride + x,
c->last_pal_pic + j * c->pal_stride + x,
width);
}
}
static int motion_compensation(MSS12Context const *c,
int x, int y, int width, int height)
{
if (x + c->mvX < 0 || x + c->mvX + width > c->avctx->width ||
y + c->mvY < 0 || y + c->mvY + height > c->avctx->height ||
!c->rgb_pic)
return -1;
else {
uint8_t *dst = c->pal_pic + x + y * c->pal_stride;
uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
uint8_t *src;
uint8_t *rgb_src;
int j;
x += c->mvX;
y += c->mvY;
if (c->last_rgb_pic) {
src = c->last_pal_pic + x + y * c->pal_stride;
rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride;
} else {
src = c->pal_pic + x + y * c->pal_stride;
rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride;
}
for (j = 0; j < height; j++) {
memmove(dst, src, width);
memmove(rgb_dst, rgb_src, width * 3);
dst += c->pal_stride;
src += c->pal_stride;
rgb_dst += c->rgb_stride;
rgb_src += c->rgb_stride;
}
}
return 0;
}
static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder, |
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uint8_t *dst, ptrdiff_t stride, uint8_t *mask,
ptrdiff_t mask_stride, int x, int y, |
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int width, int height,
PixContext *pctx)
{ |
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int i, j, p;
uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride; |
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dst += x + y * stride;
mask += x + y * mask_stride;
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) { |
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if (c->avctx->err_recognition & AV_EF_EXPLODE &&
( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
!c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
return -1;
if (mask[i] == 0x02) {
copy_rectangles(c, x + i, y + j, 1, 1);
} else if (mask[i] == 0x04) {
if (motion_compensation(c, x + i, y + j, 1, 1))
return -1;
} else if (mask[i] != 0x80) {
if (!i && !j) |
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p = decode_pixel(acoder, pctx, NULL, 0, 0); |
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else
p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
i, j, width - i - 1); |
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if (p < 0)
return p; |
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dst[i] = p;
if (c->rgb_pic)
AV_WB24(rgb_dst + i * 3, c->pal[p]);
} |
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} |
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dst += stride;
mask += mask_stride;
rgb_dst += c->rgb_stride; |
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}
return 0;
}
|
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static av_cold void slicecontext_init(SliceContext *sc,
int version, int full_model_syms) |
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{ |
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model_init(&sc->intra_region, 2, THRESH_ADAPTIVE);
model_init(&sc->inter_region, 2, THRESH_ADAPTIVE);
model_init(&sc->split_mode, 3, THRESH_HIGH);
model_init(&sc->edge_mode, 2, THRESH_HIGH);
model_init(&sc->pivot, 3, THRESH_LOW);
pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0);
pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2,
full_model_syms, version ? 1 : 0); |
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}
|
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void ff_mss12_slicecontext_reset(SliceContext *sc) |
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{ |
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model_reset(&sc->intra_region);
model_reset(&sc->inter_region);
model_reset(&sc->split_mode);
model_reset(&sc->edge_mode);
model_reset(&sc->pivot);
pixctx_reset(&sc->intra_pix_ctx);
pixctx_reset(&sc->inter_pix_ctx); |
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}
|
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static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base) |
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{
int val, inv;
|
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inv = acoder->get_model_sym(acoder, &sc->edge_mode);
val = acoder->get_model_sym(acoder, &sc->pivot) + 1; |
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if (val > 2) { |
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if ((base + 1) / 2 - 2 <= 0)
return -1;
|
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val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3;
}
|
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if ((unsigned)val >= base) |
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return -1; |
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return inv ? base - val : val;
}
|
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static int decode_region_intra(SliceContext *sc, ArithCoder *acoder, |
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int x, int y, int width, int height)
{ |
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MSS12Context const *c = sc->c; |
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int mode;
|
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mode = acoder->get_model_sym(acoder, &sc->intra_region); |
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if (!mode) { |
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int i, j, pix, rgb_pix; |
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ptrdiff_t stride = c->pal_stride;
ptrdiff_t rgb_stride = c->rgb_stride; |
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uint8_t *dst = c->pal_pic + x + y * stride;
uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride;
|
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pix = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0); |
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if (pix < 0)
return pix; |
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rgb_pix = c->pal[pix];
for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) { |
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memset(dst, pix, width); |
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if (c->rgb_pic)
for (j = 0; j < width * 3; j += 3)
AV_WB24(rgb_dst + j, rgb_pix);
} |
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} else { |
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return decode_region(acoder, c->pal_pic, c->rgb_pic,
x, y, width, height, c->pal_stride, c->rgb_stride,
&sc->intra_pix_ctx, &c->pal[0]); |
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}
return 0;
}
|
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static int decode_region_inter(SliceContext *sc, ArithCoder *acoder, |
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int x, int y, int width, int height)
{ |
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MSS12Context const *c = sc->c; |
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int mode;
|
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mode = acoder->get_model_sym(acoder, &sc->inter_region); |
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if (!mode) { |
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mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0); |
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if (mode < 0)
return mode; |
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if (c->avctx->err_recognition & AV_EF_EXPLODE &&
( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
!c->rgb_pic && mode != 0x80 && mode != 0xFF))
return -1;
if (mode == 0x02)
copy_rectangles(c, x, y, width, height);
else if (mode == 0x04)
return motion_compensation(c, x, y, width, height);
else if (mode != 0x80)
return decode_region_intra(sc, acoder, x, y, width, height); |
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} else { |
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if (decode_region(acoder, c->mask, NULL,
x, y, width, height, c->mask_stride, 0,
&sc->inter_pix_ctx, &c->pal[0]) < 0) |
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return -1; |
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return decode_region_masked(c, acoder, c->pal_pic,
c->pal_stride, c->mask,
c->mask_stride, |
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x, y, width, height, |
ee769c6a |
&sc->intra_pix_ctx); |
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}
return 0;
}
|
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int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, |
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int x, int y, int width, int height)
{
int mode, pivot; |
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if (acoder->overread > MAX_OVERREAD)
return AVERROR_INVALIDDATA; |
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|
ee769c6a |
mode = acoder->get_model_sym(acoder, &sc->split_mode); |
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switch (mode) {
case SPLIT_VERT: |
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if ((pivot = decode_pivot(sc, acoder, height)) < 1) |
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return -1; |
ee769c6a |
if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot)) |
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return -1; |
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if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot)) |
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return -1;
break;
case SPLIT_HOR: |
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if ((pivot = decode_pivot(sc, acoder, width)) < 1) |
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return -1; |
ee769c6a |
if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height)) |
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return -1; |
ee769c6a |
if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height)) |
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return -1;
break;
case SPLIT_NONE: |
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if (sc->c->keyframe)
return decode_region_intra(sc, acoder, x, y, width, height); |
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else |
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return decode_region_inter(sc, acoder, x, y, width, height); |
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default:
return -1;
}
return 0;
}
|
a97ee41b |
av_cold int ff_mss12_decode_init(MSS12Context *c, int version,
SliceContext* sc1, SliceContext *sc2) |
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{ |
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AVCodecContext *avctx = c->avctx; |
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int i;
if (avctx->extradata_size < 52 + 256 * 3) {
av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d\n",
avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
if (AV_RB32(avctx->extradata) < avctx->extradata_size) {
av_log(avctx, AV_LOG_ERROR, |
cc8163e1 |
"Insufficient extradata size: expected %"PRIu32" got %d\n", |
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AV_RB32(avctx->extradata),
avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
|
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avctx->coded_width = FFMAX(AV_RB32(avctx->extradata + 20), avctx->width);
avctx->coded_height = FFMAX(AV_RB32(avctx->extradata + 24), avctx->height); |
ee769c6a |
if (avctx->coded_width > 4096 || avctx->coded_height > 4096) {
av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too large",
avctx->coded_width, avctx->coded_height);
return AVERROR_INVALIDDATA;
} |
ee9151b6 |
if (avctx->coded_width < 1 || avctx->coded_height < 1) {
av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too small",
avctx->coded_width, avctx->coded_height);
return AVERROR_INVALIDDATA;
} |
ee769c6a |
|
cc8163e1 |
av_log(avctx, AV_LOG_DEBUG, "Encoder version %"PRIu32".%"PRIu32"\n", |
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AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8)); |
ee769c6a |
if (version != AV_RB32(avctx->extradata + 4) > 1) {
av_log(avctx, AV_LOG_ERROR,
"Header version doesn't match codec tag\n");
return -1;
}
c->free_colours = AV_RB32(avctx->extradata + 48); |
0de4a563 |
if ((unsigned)c->free_colours > 256) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect number of changeable palette entries: %d\n",
c->free_colours);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours);
|
cc8163e1 |
av_log(avctx, AV_LOG_DEBUG, "Display dimensions %"PRIu32"x%"PRIu32"\n", |
0de4a563 |
AV_RB32(avctx->extradata + 12), AV_RB32(avctx->extradata + 16));
av_log(avctx, AV_LOG_DEBUG, "Coded dimensions %dx%d\n",
avctx->coded_width, avctx->coded_height);
av_log(avctx, AV_LOG_DEBUG, "%g frames per second\n",
av_int2float(AV_RB32(avctx->extradata + 28))); |
cc8163e1 |
av_log(avctx, AV_LOG_DEBUG, "Bitrate %"PRIu32" bps\n", |
0de4a563 |
AV_RB32(avctx->extradata + 32));
av_log(avctx, AV_LOG_DEBUG, "Max. lead time %g ms\n",
av_int2float(AV_RB32(avctx->extradata + 36)));
av_log(avctx, AV_LOG_DEBUG, "Max. lag time %g ms\n",
av_int2float(AV_RB32(avctx->extradata + 40)));
av_log(avctx, AV_LOG_DEBUG, "Max. seek time %g ms\n",
av_int2float(AV_RB32(avctx->extradata + 44)));
|
ee769c6a |
if (version) {
if (avctx->extradata_size < 60 + 256 * 3) {
av_log(avctx, AV_LOG_ERROR,
"Insufficient extradata size %d for v2\n",
avctx->extradata_size);
return AVERROR_INVALIDDATA;
} |
0de4a563 |
|
ee769c6a |
c->slice_split = AV_RB32(avctx->extradata + 52);
av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split); |
0de4a563 |
|
ee769c6a |
c->full_model_syms = AV_RB32(avctx->extradata + 56);
if (c->full_model_syms < 2 || c->full_model_syms > 256) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect number of used colours %d\n",
c->full_model_syms);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "Used colours %d\n",
c->full_model_syms);
} else {
c->slice_split = 0;
c->full_model_syms = 256;
} |
0de4a563 |
|
ee769c6a |
for (i = 0; i < 256; i++) |
b12d92ef |
c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 + |
ee769c6a |
(version ? 8 : 0) + i * 3);
c->mask_stride = FFALIGN(avctx->width, 16); |
f8ff7619 |
c->mask = av_malloc_array(c->mask_stride, avctx->height); |
0de4a563 |
if (!c->mask) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n");
return AVERROR(ENOMEM);
}
|
a97ee41b |
sc1->c = c;
slicecontext_init(sc1, version, c->full_model_syms);
if (c->slice_split) {
sc2->c = c;
slicecontext_init(sc2, version, c->full_model_syms);
}
c->corrupted = 1; |
0de4a563 |
return 0;
}
|
ee769c6a |
av_cold int ff_mss12_decode_end(MSS12Context *c) |
0de4a563 |
{
av_freep(&c->mask);
return 0;
} |