675 lines
20 KiB
C
675 lines
20 KiB
C
/*
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* Copyright (c) 2012 Konstantin Shishkov
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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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/**
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* @file
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* Common functions for Microsoft Screen 1 and 2
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*/
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#include "libavutil/intfloat.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "mss12.h"
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enum SplitMode {
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SPLIT_VERT = 0,
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SPLIT_HOR,
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SPLIT_NONE
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};
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static const int sec_order_sizes[4] = { 1, 7, 6, 1 };
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enum ContextDirection {
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TOP_LEFT = 0,
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TOP,
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TOP_RIGHT,
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LEFT
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};
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static int model_calc_threshold(Model *m)
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{
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int thr;
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thr = 2 * m->weights[m->num_syms] - 1;
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thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr;
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return FFMIN(thr, 0x3FFF);
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}
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static void model_reset(Model *m)
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{
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int i;
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for (i = 0; i <= m->num_syms; i++) {
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m->weights[i] = 1;
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m->cum_prob[i] = m->num_syms - i;
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}
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m->weights[0] = 0;
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for (i = 0; i < m->num_syms; i++)
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m->idx2sym[i + 1] = i;
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}
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static av_cold void model_init(Model *m, int num_syms, int thr_weight)
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{
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m->num_syms = num_syms;
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m->thr_weight = thr_weight;
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m->threshold = num_syms * thr_weight;
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}
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static void model_rescale_weights(Model *m)
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{
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int i;
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int cum_prob;
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if (m->thr_weight == THRESH_ADAPTIVE)
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m->threshold = model_calc_threshold(m);
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while (m->cum_prob[0] > m->threshold) {
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cum_prob = 0;
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for (i = m->num_syms; i >= 0; i--) {
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m->cum_prob[i] = cum_prob;
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m->weights[i] = (m->weights[i] + 1) >> 1;
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cum_prob += m->weights[i];
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}
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}
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}
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void ff_mss12_model_update(Model *m, int val)
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{
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int i;
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if (m->weights[val] == m->weights[val - 1]) {
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for (i = val; m->weights[i - 1] == m->weights[val]; i--);
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if (i != val) {
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int sym1, sym2;
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sym1 = m->idx2sym[val];
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sym2 = m->idx2sym[i];
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m->idx2sym[val] = sym2;
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m->idx2sym[i] = sym1;
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val = i;
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}
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}
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m->weights[val]++;
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for (i = val - 1; i >= 0; i--)
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m->cum_prob[i]++;
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model_rescale_weights(m);
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}
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static void pixctx_reset(PixContext *ctx)
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{
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int i, j;
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if (!ctx->special_initial_cache)
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for (i = 0; i < ctx->cache_size; i++)
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ctx->cache[i] = i;
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else {
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ctx->cache[0] = 1;
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ctx->cache[1] = 2;
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ctx->cache[2] = 4;
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}
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model_reset(&ctx->cache_model);
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model_reset(&ctx->full_model);
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for (i = 0; i < 15; i++)
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for (j = 0; j < 4; j++)
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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,
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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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ctx->cache_size = cache_size + 4;
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ctx->num_syms = cache_size;
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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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for (i = 0, idx = 0; i < 4; i++)
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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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}
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static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
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uint8_t *ngb, int num_ngb, int any_ngb)
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{
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int i, val, pix;
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val = acoder->get_model_sym(acoder, &pctx->cache_model);
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if (val < pctx->num_syms) {
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if (any_ngb) {
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int idx, j;
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idx = 0;
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for (i = 0; i < pctx->cache_size; i++) {
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for (j = 0; j < num_ngb; j++)
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if (pctx->cache[i] == ngb[j])
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break;
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if (j == num_ngb) {
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if (idx == val)
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break;
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idx++;
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}
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}
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val = FFMIN(i, pctx->cache_size - 1);
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}
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pix = pctx->cache[val];
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} else {
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pix = acoder->get_model_sym(acoder, &pctx->full_model);
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for (i = 0; i < pctx->cache_size - 1; i++)
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if (pctx->cache[i] == pix)
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break;
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val = i;
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}
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if (val) {
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for (i = val; i > 0; i--)
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pctx->cache[i] = pctx->cache[i - 1];
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pctx->cache[0] = pix;
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}
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return pix;
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}
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static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
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uint8_t *src, int stride, int x, int y,
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int has_right)
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{
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uint8_t neighbours[4];
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uint8_t ref_pix[4];
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int nlen;
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int layer = 0, sub;
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int pix;
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int i, j;
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if (!y) {
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memset(neighbours, src[-1], 4);
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} else {
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neighbours[TOP] = src[-stride];
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if (!x) {
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neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP];
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} else {
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neighbours[TOP_LEFT] = src[-stride - 1];
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neighbours[ LEFT] = src[-1];
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}
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if (has_right)
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neighbours[TOP_RIGHT] = src[-stride + 1];
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else
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neighbours[TOP_RIGHT] = neighbours[TOP];
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}
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sub = 0;
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if (x >= 2 && src[-2] == neighbours[LEFT])
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sub = 1;
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if (y >= 2 && src[-2 * stride] == neighbours[TOP])
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sub |= 2;
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nlen = 1;
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ref_pix[0] = neighbours[0];
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for (i = 1; i < 4; i++) {
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for (j = 0; j < nlen; j++)
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if (ref_pix[j] == neighbours[i])
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break;
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if (j == nlen)
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ref_pix[nlen++] = neighbours[i];
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}
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switch (nlen) {
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case 1:
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layer = 0;
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break;
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case 2:
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if (neighbours[TOP] == neighbours[TOP_LEFT]) {
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if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
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layer = 1;
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else if (neighbours[LEFT] == neighbours[TOP_LEFT])
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layer = 2;
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else
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layer = 3;
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} else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
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if (neighbours[LEFT] == neighbours[TOP_LEFT])
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layer = 4;
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else
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layer = 5;
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} else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
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layer = 6;
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} else {
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layer = 7;
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}
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break;
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case 3:
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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;
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break;
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case 4:
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layer = 14;
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break;
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}
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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)
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return ref_pix[pix];
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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, int stride,
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int rgb_stride, PixContext *pctx, const uint32_t *pal)
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{
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int i, j, p;
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uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride;
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dst += x + y * stride;
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for (j = 0; j < height; j++) {
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for (i = 0; i < width; i++) {
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if (!i && !j)
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p = decode_pixel(acoder, pctx, NULL, 0, 0);
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else
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p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
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i, j, width - i - 1);
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dst[i] = p;
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if (rgb_pic)
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AV_WB24(rgb_dst + i * 3, pal[p]);
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}
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dst += stride;
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rgb_dst += rgb_stride;
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}
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return 0;
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}
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static void copy_rectangles(MSS12Context const *c,
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int x, int y, int width, int height)
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{
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int j;
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if (c->last_rgb_pic)
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for (j = y; j < y + height; j++) {
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memcpy(c->rgb_pic + j * c->rgb_stride + x * 3,
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c->last_rgb_pic + j * c->rgb_stride + x * 3,
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width * 3);
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memcpy(c->pal_pic + j * c->pal_stride + x,
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c->last_pal_pic + j * c->pal_stride + x,
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width);
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}
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}
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static int motion_compensation(MSS12Context const *c,
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int x, int y, int width, int height)
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{
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if (x + c->mvX < 0 || x + c->mvX + width > c->avctx->width ||
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y + c->mvY < 0 || y + c->mvY + height > c->avctx->height ||
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!c->rgb_pic)
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return -1;
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else {
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uint8_t *dst = c->pal_pic + x + y * c->pal_stride;
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uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
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uint8_t *src;
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uint8_t *rgb_src;
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int j;
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x += c->mvX;
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y += c->mvY;
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if (c->last_rgb_pic) {
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src = c->last_pal_pic + x + y * c->pal_stride;
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rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride;
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} else {
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src = c->pal_pic + x + y * c->pal_stride;
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rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride;
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}
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for (j = 0; j < height; j++) {
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memmove(dst, src, width);
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memmove(rgb_dst, rgb_src, width * 3);
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dst += c->pal_stride;
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src += c->pal_stride;
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rgb_dst += c->rgb_stride;
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rgb_src += c->rgb_stride;
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}
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}
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return 0;
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}
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static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder,
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uint8_t *dst, int stride, uint8_t *mask,
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int mask_stride, int x, int y,
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int width, int height,
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PixContext *pctx)
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{
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int i, j, p;
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uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
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dst += x + y * stride;
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mask += x + y * mask_stride;
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for (j = 0; j < height; j++) {
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for (i = 0; i < width; i++) {
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if (c->avctx->err_recognition & AV_EF_EXPLODE &&
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( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
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!c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
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return -1;
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if (mask[i] == 0x02) {
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copy_rectangles(c, x + i, y + j, 1, 1);
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} else if (mask[i] == 0x04) {
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if (motion_compensation(c, x + i, y + j, 1, 1))
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return -1;
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} else if (mask[i] != 0x80) {
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if (!i && !j)
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p = decode_pixel(acoder, pctx, NULL, 0, 0);
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else
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p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
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i, j, width - i - 1);
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dst[i] = p;
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if (c->rgb_pic)
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AV_WB24(rgb_dst + i * 3, c->pal[p]);
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}
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}
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dst += stride;
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mask += mask_stride;
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rgb_dst += c->rgb_stride;
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}
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return 0;
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}
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static av_cold void slicecontext_init(SliceContext *sc,
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int version, int full_model_syms)
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{
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model_init(&sc->intra_region, 2, THRESH_ADAPTIVE);
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model_init(&sc->inter_region, 2, THRESH_ADAPTIVE);
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model_init(&sc->split_mode, 3, THRESH_HIGH);
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model_init(&sc->edge_mode, 2, THRESH_HIGH);
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model_init(&sc->pivot, 3, THRESH_LOW);
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pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0);
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pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2,
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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);
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model_reset(&sc->inter_region);
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model_reset(&sc->split_mode);
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model_reset(&sc->edge_mode);
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model_reset(&sc->pivot);
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pixctx_reset(&sc->intra_pix_ctx);
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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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{
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int val, inv;
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inv = acoder->get_model_sym(acoder, &sc->edge_mode);
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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)
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return -1;
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val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3;
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}
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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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}
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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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{
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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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int stride = c->pal_stride;
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int rgb_stride = c->rgb_stride;
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uint8_t *dst = c->pal_pic + x + y * stride;
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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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rgb_pix = c->pal[pix];
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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)
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for (j = 0; j < width * 3; j += 3)
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AV_WB24(rgb_dst + j, rgb_pix);
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}
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} else {
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return decode_region(acoder, c->pal_pic, c->rgb_pic,
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x, y, width, height, c->pal_stride, c->rgb_stride,
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&sc->intra_pix_ctx, &c->pal[0]);
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}
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return 0;
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}
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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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{
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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 (c->avctx->err_recognition & AV_EF_EXPLODE &&
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( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
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!c->rgb_pic && mode != 0x80 && mode != 0xFF))
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return -1;
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if (mode == 0x02)
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|
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);
|
|
} else {
|
|
if (decode_region(acoder, c->mask, NULL,
|
|
x, y, width, height, c->mask_stride, 0,
|
|
&sc->inter_pix_ctx, &c->pal[0]) < 0)
|
|
return -1;
|
|
return decode_region_masked(c, acoder, c->pal_pic,
|
|
c->pal_stride, c->mask,
|
|
c->mask_stride,
|
|
x, y, width, height,
|
|
&sc->intra_pix_ctx);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder,
|
|
int x, int y, int width, int height)
|
|
{
|
|
int mode, pivot;
|
|
|
|
mode = acoder->get_model_sym(acoder, &sc->split_mode);
|
|
|
|
switch (mode) {
|
|
case SPLIT_VERT:
|
|
if ((pivot = decode_pivot(sc, acoder, height)) < 1)
|
|
return -1;
|
|
if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot))
|
|
return -1;
|
|
if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot))
|
|
return -1;
|
|
break;
|
|
case SPLIT_HOR:
|
|
if ((pivot = decode_pivot(sc, acoder, width)) < 1)
|
|
return -1;
|
|
if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height))
|
|
return -1;
|
|
if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height))
|
|
return -1;
|
|
break;
|
|
case SPLIT_NONE:
|
|
if (sc->c->keyframe)
|
|
return decode_region_intra(sc, acoder, x, y, width, height);
|
|
else
|
|
return decode_region_inter(sc, acoder, x, y, width, height);
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_mss12_decode_init(MSS12Context *c, int version,
|
|
SliceContext* sc1, SliceContext *sc2)
|
|
{
|
|
AVCodecContext *avctx = c->avctx;
|
|
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,
|
|
"Insufficient extradata size: expected %d got %d\n",
|
|
AV_RB32(avctx->extradata),
|
|
avctx->extradata_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
avctx->coded_width = AV_RB32(avctx->extradata + 20);
|
|
avctx->coded_height = AV_RB32(avctx->extradata + 24);
|
|
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;
|
|
}
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d\n",
|
|
AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8));
|
|
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);
|
|
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);
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "Display dimensions %dx%d\n",
|
|
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)));
|
|
av_log(avctx, AV_LOG_DEBUG, "Bitrate %d bps\n",
|
|
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)));
|
|
|
|
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;
|
|
}
|
|
|
|
c->slice_split = AV_RB32(avctx->extradata + 52);
|
|
av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split);
|
|
|
|
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;
|
|
}
|
|
|
|
for (i = 0; i < 256; i++)
|
|
c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 +
|
|
(version ? 8 : 0) + i * 3);
|
|
|
|
c->mask_stride = FFALIGN(avctx->width, 16);
|
|
c->mask = av_malloc(c->mask_stride * avctx->height);
|
|
if (!c->mask) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
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;
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_mss12_decode_end(MSS12Context *c)
|
|
{
|
|
av_freep(&c->mask);
|
|
|
|
return 0;
|
|
}
|