research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/filter_boxblur.c

   1 /*
   2  * filter_boxblur.c -- blur filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Leny Grisel <leny.grisel@laposte.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * aint32_t with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "filter_boxblur.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <math.h>
  28
  29
  30 static void PreCompute(uint8_t *yuv, int32_t *rgb, unsigned int width, unsigned int height)
  31 {
  32         register int x, y, z;
  33         register int uneven = width % 2;
  34         int w = (width - uneven ) / 2;
  35         int yy, uu, vv;
  36         int r, g, b;
  37         int32_t pts[3];
  38         for (y=0; y<height; y++)
  39         {
  40                 for (x=0; x<w; x++)
  41                 {
  42                         uu = yuv[1];
  43                         vv = yuv[3];
  44                         yy = yuv[0];
  45                         YUV2RGB(yy, uu, vv, r, g, b);
  46                         pts[0] = r;
  47                         pts[1] = g;
  48                         pts[2] = b;
  49                         for (z = 0; z < 3; z++)
  50                         {
  51                                 if (x>0) pts[z]+=rgb[-3];
  52                                 if (y>0) pts[z]+=rgb[-(width*3)];
  53                                 if (x>0 && y>0) pts[z]-=rgb[-((width+1)*3)];
  54                                 *rgb++=pts[z];
  55                         }
  56
  57                         yy = yuv[2];
  58                         YUV2RGB(yy, uu, vv, r, g, b);
  59                         pts[0] = r;
  60                         pts[1] = g;
  61                         pts[2] = b;
  62                         for (z = 0; z < 3; z++)
  63                         {
  64                                 pts[z]+=rgb[-3];
  65                                 if (y>0)
  66                                 {
  67                                         pts[z]+=rgb[-(width*3)];
  68                                         pts[z]-=rgb[-((width+1)*3)];
  69                                 }
  70                                 *rgb++=pts[z];
  71                         }
  72                         yuv += 4;
  73                 }
  74                 if (uneven)
  75                 {
  76                         uu = yuv[1];
  77                         vv = yuv[3];
  78                         yy = yuv[0];
  79                         YUV2RGB(yy, uu, vv, r, g, b);
  80                         pts[0] = r;
  81                         pts[1] = g;
  82                         pts[2] = b;
  83                         for (z = 0; z < 3; z++)
  84                         {
  85                                 pts[z]+=rgb[-3];
  86                                 if (y>0)
  87                                 {
  88                                         pts[z]+=rgb[-(width*3)];
  89                                         pts[z]-=rgb[-((width+1)*3)];
  90                                 }
  91                                 *rgb++=pts[z];
  92                         }
  93                         yuv += 2;
  94                 }
  95         }
  96 }
  97
  98 static int32_t GetRGB(int32_t *rgb, unsigned int w, unsigned int h, unsigned int x, int offsetx, unsigned int y, int offsety, unsigned int z)
  99 {
 100         int xtheo = x * 2 + offsetx;
 101         int ytheo = y + offsety;
 102         if (xtheo < 0) xtheo = 0; else if (xtheo >= w) xtheo = w - 1;
 103         if (ytheo < 0) ytheo = 0; else if (ytheo >= h) ytheo = h - 1;
 104         return rgb[3*(xtheo+ytheo*w)+z];
 105 }
 106
 107 static int32_t GetRGB2(int32_t *rgb, unsigned int w, unsigned int h, unsigned int x, int offsetx, unsigned int y, int offsety, unsigned int z)
 108 {
 109         int xtheo = x * 2 + 1 + offsetx;
 110         int ytheo = y + offsety;
 111         if (xtheo < 0) xtheo = 0; else if (xtheo >= w) xtheo = w - 1;
 112         if (ytheo < 0) ytheo = 0; else if (ytheo >= h) ytheo = h - 1;
 113         return rgb[3*(xtheo+ytheo*w)+z];
 114 }
 115
 116 static void DoBoxBlur(uint8_t *yuv, int32_t *rgb, unsigned int width, unsigned int height, unsigned int boxw, unsigned int boxh)
 117 {
 118         register int x, y;
 119         int32_t r, g, b;
 120         register int uneven = width % 2;
 121         register int y0, y1, u0, u1, v0, v1;
 122         int w = (width - uneven ) / 2;
 123         float mul = 1.f / ((boxw*2) * (boxh*2));
 124
 125         for (y = 0; y < height; y++)
 126         {
 127                 for (x = 0; x < w; x++)
 128                 {
 129                         r = GetRGB(rgb, width, height, x, +boxw, y, +boxh, 0) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 0) - GetRGB(rgb, width, height, x, -boxw, y, + boxh, 0) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 0);
 130                         g = GetRGB(rgb, width, height, x, +boxw, y, +boxh, 1) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 1) - GetRGB(rgb, width, height, x, -boxw, y, +boxh, 1) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 1);
 131                         b = GetRGB(rgb, width, height, x, +boxw, y, +boxh, 2) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 2) - GetRGB(rgb, width, height, x, -boxw, y, +boxh, 2) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 2);
 132                         r = (int32_t) (r * mul);
 133                         g = (int32_t) (g * mul);
 134                         b = (int32_t) (b * mul);
 135                         RGB2YUV (r, g, b, y0, u0, v0);
 136
 137                         r = GetRGB2(rgb, width, height, x, +boxw, y, +boxh, 0) + GetRGB2(rgb, width, height, x, -boxw, y, -boxh, 0) - GetRGB2(rgb, width, height, x, -boxw, y, +boxh, 0) - GetRGB2(rgb, width, height, x, +boxw, y, -boxh, 0);
 138                         g = GetRGB2(rgb, width, height, x, +boxw, y, +boxh, 1) + GetRGB2(rgb, width, height, x, -boxw, y, -boxh, 1) - GetRGB2(rgb, width, height, x, -boxw, y, +boxh, 1) - GetRGB2(rgb, width, height, x, +boxw, y, -boxh, 1);
 139                         b = GetRGB2(rgb, width, height, x, +boxw, y, +boxh, 2) + GetRGB2(rgb, width, height, x, -boxw, y, -boxh, 2) - GetRGB2(rgb, width, height, x, -boxw, y, +boxh, 2) - GetRGB2(rgb, width, height, x, +boxw, y, -boxh, 2);
 140                         r = (int32_t) (r * mul);
 141                         g = (int32_t) (g * mul);
 142                         b = (int32_t) (b * mul);
 143                         RGB2YUV (r, g, b, y1, u1, v1);
 144                         *yuv++ = y0;
 145                         *yuv++ = (u0+u1) >> 1;
 146                         *yuv++ = y1;
 147                         *yuv++ = (v0+v1) >> 1;
 148                 }
 149                 if (uneven)
 150                 {
 151                         r =  GetRGB(rgb, width, height, x, +boxw, y, +boxh, 0) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 0) - GetRGB(rgb, width, height, x, -boxw, y, +boxh, 0) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 0);
 152                         g =  GetRGB(rgb, width, height, x, +boxw, y, +boxh, 1) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 1) - GetRGB(rgb, width, height, x, -boxw, y, +boxh, 1) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 1);
 153                         b =  GetRGB(rgb, width, height, x, +boxw, y, +boxh, 2) + GetRGB(rgb, width, height, x, -boxw, y, -boxh, 2) - GetRGB(rgb, width, height, x, -boxw, y, +boxh, 2) - GetRGB(rgb, width, height, x, +boxw, y, -boxh, 2);
 154                         r = (int32_t) (r * mul);
 155                         g = (int32_t) (g * mul);
 156                         b = (int32_t) (b * mul);
 157                         RGB2YUV (r, g, b, y0, u0, v0);
 158                         *yuv++ = mul * y0;
 159                         *yuv++ = mul * u0;
 160                 }
 161         }
 162 }
 163
 164 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 165 {
 166         // Get the image
 167         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
 168         short hori = mlt_properties_get_int(MLT_FRAME_PROPERTIES( this ), "hori" );
 169         short vert = mlt_properties_get_int(MLT_FRAME_PROPERTIES( this ), "vert" );
 170
 171         // Only process if we have no error and a valid colour space
 172         if ( error == 0 && *format == mlt_image_yuv422 )
 173         {
 174                 double factor = mlt_properties_get_double( MLT_FRAME_PROPERTIES( this ), "boxblur" );
 175                 if (factor != 0) {
 176                         int h = *height + 1;
 177                         int32_t *rgb = mlt_pool_alloc (3 * *width * h * sizeof(int32_t));
 178                         PreCompute (*image, rgb, *width, h);
 179                         DoBoxBlur (*image, rgb, *width, h, (int) factor*hori, (int) factor*vert);
 180                         mlt_pool_release (rgb);
 181                 }
 182         }
 183         return error;
 184 }
 185
 186 /** Filter processing.
 187 */
 188
 189 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 190 {
 191         // Get the starting blur level
 192         double blur = (double) mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "start" );
 193         short hori = mlt_properties_get_int(MLT_FILTER_PROPERTIES( this ), "hori" );
 194         short vert = mlt_properties_get_int(MLT_FILTER_PROPERTIES( this ), "vert" );
 195
 196         // If there is an end adjust gain to the range
 197         if ( mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "end" ) != NULL )
 198         {
 199                 // Determine the time position of this frame in the transition duration
 200                 mlt_position in = mlt_filter_get_in( this );
 201                 mlt_position out = mlt_filter_get_out( this );
 202                 mlt_position time = mlt_frame_get_position( frame );
 203                 double position = (double) ( time - in ) / ( out - in + 1.0 );
 204                 double end = (double) mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "end" );
 205                 blur += ( end - blur ) * position;
 206         }
 207
 208         // Push the frame filter
 209         mlt_properties_set_double( MLT_FRAME_PROPERTIES( frame ), "boxblur", blur );
 210         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "hori", hori );
 211         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "vert", vert );
 212         mlt_frame_push_get_image( frame, filter_get_image );
 213
 214         return frame;
 215 }
 216
 217 /** Constructor for the filter.
 218 */
 219
 220 mlt_filter filter_boxblur_init( char *arg )
 221 {
 222         mlt_filter this = mlt_filter_new( );
 223         if ( this != NULL )
 224         {
 225                 this->process = filter_process;
 226                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "start", arg == NULL ? "10" : arg);
 227                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "hori", arg == NULL ? "1" : arg);
 228                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "vert", arg == NULL ? "1" : arg);
 229         }
 230         return this;
 231 }
 232
 233
 234