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  1. /*
  2.  * Copyright (C) 2003 Mike Melanson
  3.  * Copyright (C) 2003 Dr. Tim Ferguson
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * id RoQ Video common functions based on work by Dr. Tim Ferguson
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "roqvideo.h"
  29.  
  30. static inline void block_copy(unsigned char *out, unsigned char *in,
  31.                               int outstride, int instride, int sz)
  32. {
  33.     int rows = sz;
  34.     while(rows--) {
  35.         memcpy(out, in, sz);
  36.         out += outstride;
  37.         in += instride;
  38.     }
  39. }
  40.  
  41. void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
  42. {
  43.     unsigned char *bptr;
  44.     int boffs,stride;
  45.  
  46.     stride = ri->current_frame->linesize[0];
  47.     boffs = y*stride + x;
  48.  
  49.     bptr = ri->current_frame->data[0] + boffs;
  50.     bptr[0       ] = cell->y[0];
  51.     bptr[1       ] = cell->y[1];
  52.     bptr[stride  ] = cell->y[2];
  53.     bptr[stride+1] = cell->y[3];
  54.  
  55.     stride = ri->current_frame->linesize[1];
  56.     boffs = y*stride + x;
  57.  
  58.     bptr = ri->current_frame->data[1] + boffs;
  59.     bptr[0       ] =
  60.     bptr[1       ] =
  61.     bptr[stride  ] =
  62.     bptr[stride+1] = cell->u;
  63.  
  64.     bptr = ri->current_frame->data[2] + boffs;
  65.     bptr[0       ] =
  66.     bptr[1       ] =
  67.     bptr[stride  ] =
  68.     bptr[stride+1] = cell->v;
  69. }
  70.  
  71. void ff_apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
  72. {
  73.     unsigned char *bptr;
  74.     int boffs,stride;
  75.  
  76.     stride = ri->current_frame->linesize[0];
  77.     boffs = y*stride + x;
  78.  
  79.     bptr = ri->current_frame->data[0] + boffs;
  80.     bptr[         0] = bptr[         1] = bptr[stride    ] = bptr[stride  +1] = cell->y[0];
  81.     bptr[         2] = bptr[         3] = bptr[stride  +2] = bptr[stride  +3] = cell->y[1];
  82.     bptr[stride*2  ] = bptr[stride*2+1] = bptr[stride*3  ] = bptr[stride*3+1] = cell->y[2];
  83.     bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->y[3];
  84.  
  85.     stride = ri->current_frame->linesize[1];
  86.     boffs = y*stride + x;
  87.  
  88.     bptr = ri->current_frame->data[1] + boffs;
  89.     bptr[         0] = bptr[         1] = bptr[stride    ] = bptr[stride  +1] =
  90.     bptr[         2] = bptr[         3] = bptr[stride  +2] = bptr[stride  +3] =
  91.     bptr[stride*2  ] = bptr[stride*2+1] = bptr[stride*3  ] = bptr[stride*3+1] =
  92.     bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->u;
  93.  
  94.     bptr = ri->current_frame->data[2] + boffs;
  95.     bptr[         0] = bptr[         1] = bptr[stride    ] = bptr[stride  +1] =
  96.     bptr[         2] = bptr[         3] = bptr[stride  +2] = bptr[stride  +3] =
  97.     bptr[stride*2  ] = bptr[stride*2+1] = bptr[stride*3  ] = bptr[stride*3+1] =
  98.     bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->v;
  99. }
  100.  
  101.  
  102. static inline void apply_motion_generic(RoqContext *ri, int x, int y, int deltax,
  103.                                         int deltay, int sz)
  104. {
  105.     int mx, my, cp;
  106.  
  107.     mx = x + deltax;
  108.     my = y + deltay;
  109.  
  110.     /* check MV against frame boundaries */
  111.     if ((mx < 0) || (mx > ri->width - sz) ||
  112.         (my < 0) || (my > ri->height - sz)) {
  113.         av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
  114.             mx, my, ri->width, ri->height);
  115.         return;
  116.     }
  117.  
  118.     if (ri->last_frame->data[0] == NULL) {
  119.         av_log(ri->avctx, AV_LOG_ERROR, "Invalid decode type. Invalid header?\n");
  120.         return;
  121.     }
  122.  
  123.     for(cp = 0; cp < 3; cp++) {
  124.         int outstride = ri->current_frame->linesize[cp];
  125.         int instride  = ri->last_frame   ->linesize[cp];
  126.         block_copy(ri->current_frame->data[cp] + y*outstride + x,
  127.                    ri->last_frame->data[cp] + my*instride + mx,
  128.                    outstride, instride, sz);
  129.     }
  130. }
  131.  
  132.  
  133. void ff_apply_motion_4x4(RoqContext *ri, int x, int y,
  134.                              int deltax, int deltay)
  135. {
  136.     apply_motion_generic(ri, x, y, deltax, deltay, 4);
  137. }
  138.  
  139. void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
  140.                              int deltax, int deltay)
  141. {
  142.     apply_motion_generic(ri, x, y, deltax, deltay, 8);
  143. }
  144.