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 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26
  27 /** Do it :-).
  28 */
  29
  30 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  31 {
  32         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  33         if ( error == 0 && *format == mlt_image_yuv422 )
  34         {
  35                 uint8_t *p = *image;
  36                 uint8_t *q = *image + *width * *height * 2;
  37                 while ( p ++ != q )
  38                         *p ++ = 128;
  39         }
  40         return error;
  41 }
  42
  43 /** Filter processing.
  44 */
  45
  46 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  47 {
  48         mlt_frame_push_get_image( frame, filter_get_image );
  49         return frame;
  50 }
  51
  52 /** Constructor for the filter.
  53 */
  54
  55 mlt_filter filter_greyscale_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  56 {
  57         mlt_filter this = mlt_filter_new( );
  58         if ( this != NULL )
  59                 this->process = filter_process;
  60         return this;
  61 }
  62