research.m1stereo.tv/gitweb/ - melted/blob - src/modules/oldfilm/filter_oldfilm.c

   1 /*
   2  * filter_oldfilm.c -- oldfilm filter
   3  * Copyright (c) 2007 Marco Gittler <g.marco@freenet.de>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "filter_oldfilm.h"
  21
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27
  28
  29 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  30 {
  31
  32         mlt_filter filter = mlt_frame_pop_service( this );
  33         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  34
  35         if (  error == 0 && *image && *format == mlt_image_yuv422 )
  36         {
  37                 int h = *height;
  38                 int w = *width;
  39
  40                 int x=0;
  41                 int y=0;
  42                 // Get u and v values
  43                 int delta = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "delta" );
  44                 int every = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "every" );
  45                 int diffpic=rand()%delta*2-delta;
  46                 if (rand()%100>every)
  47                         diffpic=0;
  48                 int yend,ydiff;
  49                 if (diffpic<=0){
  50                         y=h;
  51                         yend=0;
  52                         ydiff=-1;
  53                 }else{
  54                         y=0;
  55                         yend=h;
  56                         ydiff=1;
  57                 }
  58                 while(y!=yend){
  59                         for (x=0;x<w;x++){
  60                                         uint8_t* pic=(*image+y*w*2+x*2);
  61                                         if (y+diffpic>0 && y+diffpic<h){
  62                                                 *pic=*(pic+diffpic*w*2);
  63                                                 *(pic+1)=*(pic+diffpic*w*2+1);
  64                                         }else{
  65                                                 *pic=0;
  66                                                 *(pic+1)=127;
  67                                         }
  68                         }
  69                         y+=ydiff;
  70                 }
  71         }
  72
  73         return error;
  74 }
  75
  76 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  77 {
  78
  79         mlt_frame_push_service( frame, this );
  80         mlt_frame_push_get_image( frame, filter_get_image );
  81         return frame;
  82 }
  83
  84 mlt_filter filter_oldfilm_init( char *arg )
  85 {
  86         mlt_filter this = mlt_filter_new( );
  87         if ( this != NULL )
  88         {
  89                 this->process = filter_process;
  90                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "delta", "20" );
  91                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "every", "80" );
  92         }
  93         return this;
  94 }
  95