libavcodec/roqvideo.c

   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 libavcodec/roqvideo.c
  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     for(cp = 0; cp < 3; cp++) {
 119         int outstride = ri->current_frame->linesize[cp];
 120         int instride  = ri->last_frame   ->linesize[cp];
 121         block_copy(ri->current_frame->data[cp] + y*outstride + x,
 122                    ri->last_frame->data[cp] + my*instride + mx,
 123                    outstride, instride, sz);
 124     }
 125 }
 126
 127
 128 void ff_apply_motion_4x4(RoqContext *ri, int x, int y,
 129                              int deltax, int deltay)
 130 {
 131     apply_motion_generic(ri, x, y, deltax, deltay, 4);
 132 }
 133
 134 void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
 135                              int deltax, int deltay)
 136 {
 137     apply_motion_generic(ri, x, y, deltax, deltay, 8);
 138 }