yading@10: /*
yading@10:  * Copyright (c) 2012 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Common functions for Microsoft Screen 1 and 2
yading@10:  */
yading@10: 
yading@10: #include "libavutil/intfloat.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "avcodec.h"
yading@10: #include "mss12.h"
yading@10: 
yading@10: enum SplitMode {
yading@10:     SPLIT_VERT = 0,
yading@10:     SPLIT_HOR,
yading@10:     SPLIT_NONE
yading@10: };
yading@10: 
yading@10: static const int sec_order_sizes[4] = { 1, 7, 6, 1 };
yading@10: 
yading@10: enum ContextDirection {
yading@10:     TOP_LEFT = 0,
yading@10:     TOP,
yading@10:     TOP_RIGHT,
yading@10:     LEFT
yading@10: };
yading@10: 
yading@10: static int model_calc_threshold(Model *m)
yading@10: {
yading@10:     int thr;
yading@10: 
yading@10:     thr = 2 * m->weights[m->num_syms] - 1;
yading@10:     thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr;
yading@10: 
yading@10:     return FFMIN(thr, 0x3FFF);
yading@10: }
yading@10: 
yading@10: static void model_reset(Model *m)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i <= m->num_syms; i++) {
yading@10:         m->weights[i]  = 1;
yading@10:         m->cum_prob[i] = m->num_syms - i;
yading@10:     }
yading@10:     m->weights[0] = 0;
yading@10:     for (i = 0; i < m->num_syms; i++)
yading@10:         m->idx2sym[i + 1] = i;
yading@10: }
yading@10: 
yading@10: static av_cold void model_init(Model *m, int num_syms, int thr_weight)
yading@10: {
yading@10:     m->num_syms   = num_syms;
yading@10:     m->thr_weight = thr_weight;
yading@10:     m->threshold  = num_syms * thr_weight;
yading@10: }
yading@10: 
yading@10: static void model_rescale_weights(Model *m)
yading@10: {
yading@10:     int i;
yading@10:     int cum_prob;
yading@10: 
yading@10:     if (m->thr_weight == THRESH_ADAPTIVE)
yading@10:         m->threshold = model_calc_threshold(m);
yading@10:     while (m->cum_prob[0] > m->threshold) {
yading@10:         cum_prob = 0;
yading@10:         for (i = m->num_syms; i >= 0; i--) {
yading@10:             m->cum_prob[i] = cum_prob;
yading@10:             m->weights[i]  = (m->weights[i] + 1) >> 1;
yading@10:             cum_prob      += m->weights[i];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_mss12_model_update(Model *m, int val)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     if (m->weights[val] == m->weights[val - 1]) {
yading@10:         for (i = val; m->weights[i - 1] == m->weights[val]; i--);
yading@10:         if (i != val) {
yading@10:             int sym1, sym2;
yading@10: 
yading@10:             sym1 = m->idx2sym[val];
yading@10:             sym2 = m->idx2sym[i];
yading@10: 
yading@10:             m->idx2sym[val]  = sym2;
yading@10:             m->idx2sym[i]    = sym1;
yading@10: 
yading@10:             val = i;
yading@10:         }
yading@10:     }
yading@10:     m->weights[val]++;
yading@10:     for (i = val - 1; i >= 0; i--)
yading@10:         m->cum_prob[i]++;
yading@10:     model_rescale_weights(m);
yading@10: }
yading@10: 
yading@10: static void pixctx_reset(PixContext *ctx)
yading@10: {
yading@10:     int i, j;
yading@10: 
yading@10:     if (!ctx->special_initial_cache)
yading@10:         for (i = 0; i < ctx->cache_size; i++)
yading@10:             ctx->cache[i] = i;
yading@10:     else {
yading@10:         ctx->cache[0] = 1;
yading@10:         ctx->cache[1] = 2;
yading@10:         ctx->cache[2] = 4;
yading@10:     }
yading@10: 
yading@10:     model_reset(&ctx->cache_model);
yading@10:     model_reset(&ctx->full_model);
yading@10: 
yading@10:     for (i = 0; i < 15; i++)
yading@10:         for (j = 0; j < 4; j++)
yading@10:             model_reset(&ctx->sec_models[i][j]);
yading@10: }
yading@10: 
yading@10: static av_cold void pixctx_init(PixContext *ctx, int cache_size,
yading@10:                                 int full_model_syms, int special_initial_cache)
yading@10: {
yading@10:     int i, j, k, idx;
yading@10: 
yading@10:     ctx->cache_size            = cache_size + 4;
yading@10:     ctx->num_syms              = cache_size;
yading@10:     ctx->special_initial_cache = special_initial_cache;
yading@10: 
yading@10:     model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW);
yading@10:     model_init(&ctx->full_model, full_model_syms, THRESH_HIGH);
yading@10: 
yading@10:     for (i = 0, idx = 0; i < 4; i++)
yading@10:         for (j = 0; j < sec_order_sizes[i]; j++, idx++)
yading@10:             for (k = 0; k < 4; k++)
yading@10:                 model_init(&ctx->sec_models[idx][k], 2 + i,
yading@10:                            i ? THRESH_LOW : THRESH_ADAPTIVE);
yading@10: }
yading@10: 
yading@10: static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
yading@10:                                          uint8_t *ngb, int num_ngb, int any_ngb)
yading@10: {
yading@10:     int i, val, pix;
yading@10: 
yading@10:     val = acoder->get_model_sym(acoder, &pctx->cache_model);
yading@10:     if (val < pctx->num_syms) {
yading@10:         if (any_ngb) {
yading@10:             int idx, j;
yading@10: 
yading@10:             idx = 0;
yading@10:             for (i = 0; i < pctx->cache_size; i++) {
yading@10:                 for (j = 0; j < num_ngb; j++)
yading@10:                     if (pctx->cache[i] == ngb[j])
yading@10:                         break;
yading@10:                 if (j == num_ngb) {
yading@10:                     if (idx == val)
yading@10:                         break;
yading@10:                     idx++;
yading@10:                 }
yading@10:             }
yading@10:             val = FFMIN(i, pctx->cache_size - 1);
yading@10:         }
yading@10:         pix = pctx->cache[val];
yading@10:     } else {
yading@10:         pix = acoder->get_model_sym(acoder, &pctx->full_model);
yading@10:         for (i = 0; i < pctx->cache_size - 1; i++)
yading@10:             if (pctx->cache[i] == pix)
yading@10:                 break;
yading@10:         val = i;
yading@10:     }
yading@10:     if (val) {
yading@10:         for (i = val; i > 0; i--)
yading@10:             pctx->cache[i] = pctx->cache[i - 1];
yading@10:         pctx->cache[0] = pix;
yading@10:     }
yading@10: 
yading@10:     return pix;
yading@10: }
yading@10: 
yading@10: static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
yading@10:                                    uint8_t *src, int stride, int x, int y,
yading@10:                                    int has_right)
yading@10: {
yading@10:     uint8_t neighbours[4];
yading@10:     uint8_t ref_pix[4];
yading@10:     int nlen;
yading@10:     int layer = 0, sub;
yading@10:     int pix;
yading@10:     int i, j;
yading@10: 
yading@10:     if (!y) {
yading@10:         memset(neighbours, src[-1], 4);
yading@10:     } else {
yading@10:         neighbours[TOP] = src[-stride];
yading@10:         if (!x) {
yading@10:             neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP];
yading@10:         } else {
yading@10:             neighbours[TOP_LEFT] = src[-stride - 1];
yading@10:             neighbours[    LEFT] = src[-1];
yading@10:         }
yading@10:         if (has_right)
yading@10:             neighbours[TOP_RIGHT] = src[-stride + 1];
yading@10:         else
yading@10:             neighbours[TOP_RIGHT] = neighbours[TOP];
yading@10:     }
yading@10: 
yading@10:     sub = 0;
yading@10:     if (x >= 2 && src[-2] == neighbours[LEFT])
yading@10:         sub  = 1;
yading@10:     if (y >= 2 && src[-2 * stride] == neighbours[TOP])
yading@10:         sub |= 2;
yading@10: 
yading@10:     nlen = 1;
yading@10:     ref_pix[0] = neighbours[0];
yading@10:     for (i = 1; i < 4; i++) {
yading@10:         for (j = 0; j < nlen; j++)
yading@10:             if (ref_pix[j] == neighbours[i])
yading@10:                 break;
yading@10:         if (j == nlen)
yading@10:             ref_pix[nlen++] = neighbours[i];
yading@10:     }
yading@10: 
yading@10:     switch (nlen) {
yading@10:     case 1:
yading@10:         layer = 0;
yading@10:         break;
yading@10:     case 2:
yading@10:         if (neighbours[TOP] == neighbours[TOP_LEFT]) {
yading@10:             if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
yading@10:                 layer = 1;
yading@10:             else if (neighbours[LEFT] == neighbours[TOP_LEFT])
yading@10:                 layer = 2;
yading@10:             else
yading@10:                 layer = 3;
yading@10:         } else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
yading@10:             if (neighbours[LEFT] == neighbours[TOP_LEFT])
yading@10:                 layer = 4;
yading@10:             else
yading@10:                 layer = 5;
yading@10:         } else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
yading@10:             layer = 6;
yading@10:         } else {
yading@10:             layer = 7;
yading@10:         }
yading@10:         break;
yading@10:     case 3:
yading@10:         if (neighbours[TOP] == neighbours[TOP_LEFT])
yading@10:             layer = 8;
yading@10:         else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
yading@10:             layer = 9;
yading@10:         else if (neighbours[LEFT] == neighbours[TOP_LEFT])
yading@10:             layer = 10;
yading@10:         else if (neighbours[TOP_RIGHT] == neighbours[TOP])
yading@10:             layer = 11;
yading@10:         else if (neighbours[TOP] == neighbours[LEFT])
yading@10:             layer = 12;
yading@10:         else
yading@10:             layer = 13;
yading@10:         break;
yading@10:     case 4:
yading@10:         layer = 14;
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     pix = acoder->get_model_sym(acoder,
yading@10:                                 &pctx->sec_models[layer][sub]);
yading@10:     if (pix < nlen)
yading@10:         return ref_pix[pix];
yading@10:     else
yading@10:         return decode_pixel(acoder, pctx, ref_pix, nlen, 1);
yading@10: }
yading@10: 
yading@10: static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic,
yading@10:                          int x, int y, int width, int height, int stride,
yading@10:                          int rgb_stride, PixContext *pctx, const uint32_t *pal)
yading@10: {
yading@10:     int i, j, p;
yading@10:     uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride;
yading@10: 
yading@10:     dst += x + y * stride;
yading@10: 
yading@10:     for (j = 0; j < height; j++) {
yading@10:         for (i = 0; i < width; i++) {
yading@10:             if (!i && !j)
yading@10:                 p = decode_pixel(acoder, pctx, NULL, 0, 0);
yading@10:             else
yading@10:                 p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
yading@10:                                             i, j, width - i - 1);
yading@10:             dst[i] = p;
yading@10: 
yading@10:             if (rgb_pic)
yading@10:                 AV_WB24(rgb_dst + i * 3, pal[p]);
yading@10:         }
yading@10:         dst     += stride;
yading@10:         rgb_dst += rgb_stride;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void copy_rectangles(MSS12Context const *c,
yading@10:                             int x, int y, int width, int height)
yading@10: {
yading@10:     int j;
yading@10: 
yading@10:     if (c->last_rgb_pic)
yading@10:         for (j = y; j < y + height; j++) {
yading@10:             memcpy(c->rgb_pic      + j * c->rgb_stride + x * 3,
yading@10:                    c->last_rgb_pic + j * c->rgb_stride + x * 3,
yading@10:                    width * 3);
yading@10:             memcpy(c->pal_pic      + j * c->pal_stride + x,
yading@10:                    c->last_pal_pic + j * c->pal_stride + x,
yading@10:                    width);
yading@10:         }
yading@10: }
yading@10: 
yading@10: static int motion_compensation(MSS12Context const *c,
yading@10:                                int x, int y, int width, int height)
yading@10: {
yading@10:     if (x + c->mvX < 0 || x + c->mvX + width  > c->avctx->width  ||
yading@10:         y + c->mvY < 0 || y + c->mvY + height > c->avctx->height ||
yading@10:         !c->rgb_pic)
yading@10:         return -1;
yading@10:     else {
yading@10:         uint8_t *dst     = c->pal_pic + x     + y * c->pal_stride;
yading@10:         uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
yading@10:         uint8_t *src;
yading@10:         uint8_t *rgb_src;
yading@10:         int j;
yading@10:         x += c->mvX;
yading@10:         y += c->mvY;
yading@10:         if (c->last_rgb_pic) {
yading@10:             src     = c->last_pal_pic + x +     y * c->pal_stride;
yading@10:             rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride;
yading@10:         } else {
yading@10:             src     = c->pal_pic + x     + y * c->pal_stride;
yading@10:             rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride;
yading@10:         }
yading@10:         for (j = 0; j < height; j++) {
yading@10:             memmove(dst, src, width);
yading@10:             memmove(rgb_dst, rgb_src, width * 3);
yading@10:             dst     += c->pal_stride;
yading@10:             src     += c->pal_stride;
yading@10:             rgb_dst += c->rgb_stride;
yading@10:             rgb_src += c->rgb_stride;
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder,
yading@10:                                 uint8_t *dst, int stride, uint8_t *mask,
yading@10:                                 int mask_stride, int x, int y,
yading@10:                                 int width, int height,
yading@10:                                 PixContext *pctx)
yading@10: {
yading@10:     int i, j, p;
yading@10:     uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
yading@10: 
yading@10:     dst  += x + y * stride;
yading@10:     mask += x + y * mask_stride;
yading@10: 
yading@10:     for (j = 0; j < height; j++) {
yading@10:         for (i = 0; i < width; i++) {
yading@10:             if (c->avctx->err_recognition & AV_EF_EXPLODE &&
yading@10:                 ( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
yading@10:                  !c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
yading@10:                 return -1;
yading@10: 
yading@10:             if (mask[i] == 0x02) {
yading@10:                 copy_rectangles(c, x + i, y + j, 1, 1);
yading@10:             } else if (mask[i] == 0x04) {
yading@10:                 if (motion_compensation(c, x + i, y + j, 1, 1))
yading@10:                     return -1;
yading@10:             } else if (mask[i] != 0x80) {
yading@10:                 if (!i && !j)
yading@10:                     p = decode_pixel(acoder, pctx, NULL, 0, 0);
yading@10:                 else
yading@10:                     p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
yading@10:                                                 i, j, width - i - 1);
yading@10:                 dst[i] = p;
yading@10:                 if (c->rgb_pic)
yading@10:                     AV_WB24(rgb_dst + i * 3, c->pal[p]);
yading@10:             }
yading@10:         }
yading@10:         dst     += stride;
yading@10:         mask    += mask_stride;
yading@10:         rgb_dst += c->rgb_stride;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold void slicecontext_init(SliceContext *sc,
yading@10:                                       int version, int full_model_syms)
yading@10: {
yading@10:     model_init(&sc->intra_region, 2, THRESH_ADAPTIVE);
yading@10:     model_init(&sc->inter_region, 2, THRESH_ADAPTIVE);
yading@10:     model_init(&sc->split_mode,   3, THRESH_HIGH);
yading@10:     model_init(&sc->edge_mode,    2, THRESH_HIGH);
yading@10:     model_init(&sc->pivot,        3, THRESH_LOW);
yading@10: 
yading@10:     pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0);
yading@10: 
yading@10:     pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2,
yading@10:                 full_model_syms, version ? 1 : 0);
yading@10: }
yading@10: 
yading@10: void ff_mss12_slicecontext_reset(SliceContext *sc)
yading@10: {
yading@10:     model_reset(&sc->intra_region);
yading@10:     model_reset(&sc->inter_region);
yading@10:     model_reset(&sc->split_mode);
yading@10:     model_reset(&sc->edge_mode);
yading@10:     model_reset(&sc->pivot);
yading@10:     pixctx_reset(&sc->intra_pix_ctx);
yading@10:     pixctx_reset(&sc->inter_pix_ctx);
yading@10: }
yading@10: 
yading@10: static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base)
yading@10: {
yading@10:     int val, inv;
yading@10: 
yading@10:     inv = acoder->get_model_sym(acoder, &sc->edge_mode);
yading@10:     val = acoder->get_model_sym(acoder, &sc->pivot) + 1;
yading@10: 
yading@10:     if (val > 2) {
yading@10:         if ((base + 1) / 2 - 2 <= 0)
yading@10:             return -1;
yading@10: 
yading@10:         val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3;
yading@10:     }
yading@10: 
yading@10:     if ((unsigned)val >= base)
yading@10:         return -1;
yading@10: 
yading@10:     return inv ? base - val : val;
yading@10: }
yading@10: 
yading@10: static int decode_region_intra(SliceContext *sc, ArithCoder *acoder,
yading@10:                                int x, int y, int width, int height)
yading@10: {
yading@10:     MSS12Context const *c = sc->c;
yading@10:     int mode;
yading@10: 
yading@10:     mode = acoder->get_model_sym(acoder, &sc->intra_region);
yading@10: 
yading@10:     if (!mode) {
yading@10:         int i, j, pix, rgb_pix;
yading@10:         int stride       = c->pal_stride;
yading@10:         int rgb_stride   = c->rgb_stride;
yading@10:         uint8_t *dst     = c->pal_pic + x     + y * stride;
yading@10:         uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride;
yading@10: 
yading@10:         pix     = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0);
yading@10:         rgb_pix = c->pal[pix];
yading@10:         for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) {
yading@10:             memset(dst, pix, width);
yading@10:             if (c->rgb_pic)
yading@10:                 for (j = 0; j < width * 3; j += 3)
yading@10:                     AV_WB24(rgb_dst + j, rgb_pix);
yading@10:         }
yading@10:     } else {
yading@10:         return decode_region(acoder, c->pal_pic, c->rgb_pic,
yading@10:                              x, y, width, height, c->pal_stride, c->rgb_stride,
yading@10:                              &sc->intra_pix_ctx, &c->pal[0]);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_region_inter(SliceContext *sc, ArithCoder *acoder,
yading@10:                                int x, int y, int width, int height)
yading@10: {
yading@10:     MSS12Context const *c = sc->c;
yading@10:     int mode;
yading@10: 
yading@10:     mode = acoder->get_model_sym(acoder, &sc->inter_region);
yading@10: 
yading@10:     if (!mode) {
yading@10:         mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0);
yading@10: 
yading@10:         if (c->avctx->err_recognition & AV_EF_EXPLODE &&
yading@10:             ( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
yading@10:              !c->rgb_pic && mode != 0x80 && mode != 0xFF))
yading@10:             return -1;
yading@10: 
yading@10:         if (mode == 0x02)
yading@10:             copy_rectangles(c, x, y, width, height);
yading@10:         else if (mode == 0x04)
yading@10:             return motion_compensation(c, x, y, width, height);
yading@10:         else if (mode != 0x80)
yading@10:             return decode_region_intra(sc, acoder, x, y, width, height);
yading@10:     } else {
yading@10:         if (decode_region(acoder, c->mask, NULL,
yading@10:                           x, y, width, height, c->mask_stride, 0,
yading@10:                           &sc->inter_pix_ctx, &c->pal[0]) < 0)
yading@10:             return -1;
yading@10:         return decode_region_masked(c, acoder, c->pal_pic,
yading@10:                                     c->pal_stride, c->mask,
yading@10:                                     c->mask_stride,
yading@10:                                     x, y, width, height,
yading@10:                                     &sc->intra_pix_ctx);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder,
yading@10:                          int x, int y, int width, int height)
yading@10: {
yading@10:     int mode, pivot;
yading@10: 
yading@10:     mode = acoder->get_model_sym(acoder, &sc->split_mode);
yading@10: 
yading@10:     switch (mode) {
yading@10:     case SPLIT_VERT:
yading@10:         if ((pivot = decode_pivot(sc, acoder, height)) < 1)
yading@10:             return -1;
yading@10:         if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot))
yading@10:             return -1;
yading@10:         if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot))
yading@10:             return -1;
yading@10:         break;
yading@10:     case SPLIT_HOR:
yading@10:         if ((pivot = decode_pivot(sc, acoder, width)) < 1)
yading@10:             return -1;
yading@10:         if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height))
yading@10:             return -1;
yading@10:         if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height))
yading@10:             return -1;
yading@10:         break;
yading@10:     case SPLIT_NONE:
yading@10:         if (sc->c->keyframe)
yading@10:             return decode_region_intra(sc, acoder, x, y, width, height);
yading@10:         else
yading@10:             return decode_region_inter(sc, acoder, x, y, width, height);
yading@10:     default:
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: av_cold int ff_mss12_decode_init(MSS12Context *c, int version,
yading@10:                                  SliceContext* sc1, SliceContext *sc2)
yading@10: {
yading@10:     AVCodecContext *avctx = c->avctx;
yading@10:     int i;
yading@10: 
yading@10:     if (avctx->extradata_size < 52 + 256 * 3) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d\n",
yading@10:                avctx->extradata_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (AV_RB32(avctx->extradata) < avctx->extradata_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Insufficient extradata size: expected %d got %d\n",
yading@10:                AV_RB32(avctx->extradata),
yading@10:                avctx->extradata_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     avctx->coded_width  = AV_RB32(avctx->extradata + 20);
yading@10:     avctx->coded_height = AV_RB32(avctx->extradata + 24);
yading@10:     if (avctx->coded_width > 4096 || avctx->coded_height > 4096) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too large",
yading@10:                avctx->coded_width, avctx->coded_height);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (avctx->coded_width < 1 || avctx->coded_height < 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too small",
yading@10:                avctx->coded_width, avctx->coded_height);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d\n",
yading@10:            AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8));
yading@10:     if (version != AV_RB32(avctx->extradata + 4) > 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Header version doesn't match codec tag\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     c->free_colours = AV_RB32(avctx->extradata + 48);
yading@10:     if ((unsigned)c->free_colours > 256) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Incorrect number of changeable palette entries: %d\n",
yading@10:                c->free_colours);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours);
yading@10: 
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Display dimensions %dx%d\n",
yading@10:            AV_RB32(avctx->extradata + 12), AV_RB32(avctx->extradata + 16));
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Coded dimensions %dx%d\n",
yading@10:            avctx->coded_width, avctx->coded_height);
yading@10:     av_log(avctx, AV_LOG_DEBUG, "%g frames per second\n",
yading@10:            av_int2float(AV_RB32(avctx->extradata + 28)));
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Bitrate %d bps\n",
yading@10:            AV_RB32(avctx->extradata + 32));
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Max. lead time %g ms\n",
yading@10:            av_int2float(AV_RB32(avctx->extradata + 36)));
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Max. lag time %g ms\n",
yading@10:            av_int2float(AV_RB32(avctx->extradata + 40)));
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Max. seek time %g ms\n",
yading@10:            av_int2float(AV_RB32(avctx->extradata + 44)));
yading@10: 
yading@10:     if (version) {
yading@10:         if (avctx->extradata_size < 60 + 256 * 3) {
yading@10:             av_log(avctx, AV_LOG_ERROR,
yading@10:                    "Insufficient extradata size %d for v2\n",
yading@10:                    avctx->extradata_size);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         c->slice_split = AV_RB32(avctx->extradata + 52);
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split);
yading@10: 
yading@10:         c->full_model_syms = AV_RB32(avctx->extradata + 56);
yading@10:         if (c->full_model_syms < 2 || c->full_model_syms > 256) {
yading@10:             av_log(avctx, AV_LOG_ERROR,
yading@10:                    "Incorrect number of used colours %d\n",
yading@10:                    c->full_model_syms);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Used colours %d\n",
yading@10:                c->full_model_syms);
yading@10:     } else {
yading@10:         c->slice_split     = 0;
yading@10:         c->full_model_syms = 256;
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < 256; i++)
yading@10:         c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 +
yading@10:                             (version ? 8 : 0) + i * 3);
yading@10: 
yading@10:     c->mask_stride = FFALIGN(avctx->width, 16);
yading@10:     c->mask        = av_malloc(c->mask_stride * avctx->height);
yading@10:     if (!c->mask) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n");
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     sc1->c = c;
yading@10:     slicecontext_init(sc1, version, c->full_model_syms);
yading@10:     if (c->slice_split) {
yading@10:         sc2->c = c;
yading@10:         slicecontext_init(sc2, version, c->full_model_syms);
yading@10:     }
yading@10:     c->corrupted = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: av_cold int ff_mss12_decode_end(MSS12Context *c)
yading@10: {
yading@10:     av_freep(&c->mask);
yading@10: 
yading@10:     return 0;
yading@10: }