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

   1 /*
   2  * filter_greyscale.c -- greyscale filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   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  * along 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_greyscale.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27
  28 /** Do it :-).
  29 */
  30
  31 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  32 {
  33         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  34         if ( error == 0 && *format == mlt_image_yuv422 )
  35         {
  36                 uint8_t *p = *image;
  37                 uint8_t *q = *image + *width * *height * 2;
  38                 while ( p ++ != q )
  39                         *p ++ = 128;
  40         }
  41         return error;
  42 }
  43
  44 /** Filter processing.
  45 */
  46
  47 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  48 {
  49         mlt_frame_push_get_image( frame, filter_get_image );
  50         return frame;
  51 }
  52
  53 /** Constructor for the filter.
  54 */
  55
  56 mlt_filter filter_greyscale_init( void *arg )
  57 {
  58         mlt_filter this = mlt_filter_new( );
  59         if ( this != NULL )
  60                 this->process = filter_process;
  61         return this;
  62 }
  63