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

   1 /*
   2  * filter_crop.c -- cropping filter
   3  * Copyright (C) 2009 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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 #include <framework/mlt_log.h>
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <math.h>
  29
  30 static void crop( uint8_t *src, uint8_t *dest, int bpp, int width, int height, int left, int right, int top, int bottom )
  31 {
  32         int stride = ( width - left - right ) * bpp + 1;
  33         int y      = height - top - bottom + 1;
  34         uint8_t *s = &src[ ( ( top * width ) + left ) * bpp ];
  35
  36         while ( --y )
  37         {
  38                 int x = stride;
  39                 while ( --x )
  40                         *dest ++ = *s ++;
  41                 s += ( right + left ) * bpp;
  42         }
  43 }
  44
  45 /** Do it :-).
  46 */
  47
  48 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  49 {
  50         int error = 0;
  51
  52         // Get the properties from the frame
  53         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
  54
  55         // Correct Width/height if necessary
  56         if ( *width == 0 || *height == 0 )
  57         {
  58                 *width  = mlt_properties_get_int( properties, "normalised_width" );
  59                 *height = mlt_properties_get_int( properties, "normalised_height" );
  60         }
  61
  62         // Now get the image
  63         error = mlt_frame_get_image( this, image, format, width, height, writable );
  64
  65         int left    = mlt_properties_get_int( properties, "crop.left" );
  66         int right   = mlt_properties_get_int( properties, "crop.right" );
  67         int top     = mlt_properties_get_int( properties, "crop.top" );
  68         int bottom  = mlt_properties_get_int( properties, "crop.bottom" );
  69         int owidth  = *width - left - right;
  70         int oheight = *height - top - bottom;
  71
  72         // We only know how to process yuv422 at the moment
  73         if ( ( owidth != *width || oheight != *height ) &&
  74                 error == 0 && *format == mlt_image_yuv422 && *image != NULL && owidth > 0 && oheight > 0 )
  75         {
  76                 // Provides a manual override for misreported field order
  77                 if ( mlt_properties_get( properties, "meta.top_field_first" ) )
  78                 {
  79                         mlt_properties_set_int( properties, "top_field_first", mlt_properties_get_int( properties, "meta.top_field_first" ) );
  80                         mlt_properties_set_int( properties, "meta.top_field_first", 0 );
  81                 }
  82
  83                 if ( top % 2 )
  84                         mlt_properties_set_int( properties, "top_field_first", !mlt_properties_get_int( properties, "top_field_first" ) );
  85
  86                 left  -= left % 2;
  87                 owidth = *width - left - right;
  88
  89                 // Create the output image
  90                 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
  91                 if ( output )
  92                 {
  93                         // Call the generic resize
  94                         crop( *image, output, 2, *width, *height, left, right, top, bottom );
  95
  96                         // Now update the frame
  97                         *image = output;
  98                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
  99                         mlt_properties_set_int( properties, "width", owidth );
 100                         mlt_properties_set_int( properties, "height", oheight );
 101                 }
 102
 103                 // We should resize the alpha too
 104                 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 105                 if ( alpha != NULL )
 106                 {
 107                         uint8_t *newalpha = mlt_pool_alloc( owidth * oheight );
 108                         if ( newalpha )
 109                         {
 110                                 crop( alpha, newalpha, 1, *width, *height, left, right, top, bottom );
 111                                 mlt_properties_set_data( properties, "alpha", newalpha, owidth * oheight, ( mlt_destructor )mlt_pool_release, NULL );
 112                                 this->get_alpha_mask = NULL;
 113                         }
 114                 }
 115                 *width = owidth;
 116                 *height = oheight;
 117         }
 118
 119         return error;
 120 }
 121
 122 /** Filter processing.
 123 */
 124
 125 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 126 {
 127         if ( mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "active" ) )
 128         {
 129                 // Push the get_image method on to the stack
 130                 mlt_frame_push_get_image( frame, filter_get_image );
 131         }
 132         else
 133         {
 134                 mlt_properties filter_props = MLT_FILTER_PROPERTIES( this );
 135                 mlt_properties frame_props = MLT_FRAME_PROPERTIES( frame );
 136                 int left   = mlt_properties_get_int( filter_props, "left" );
 137                 int right  = mlt_properties_get_int( filter_props, "right" );
 138                 int top    = mlt_properties_get_int( filter_props, "top" );
 139                 int bottom = mlt_properties_get_int( filter_props, "bottom" );
 140                 int width  = mlt_properties_get_int( frame_props, "real_width" );
 141                 int height = mlt_properties_get_int( frame_props, "real_height" );
 142
 143                 mlt_properties_set_int( frame_props, "crop.left", left );
 144                 mlt_properties_set_int( frame_props, "crop.right", right );
 145                 mlt_properties_set_int( frame_props, "crop.top", top );
 146                 mlt_properties_set_int( frame_props, "crop.bottom", bottom );
 147                 mlt_properties_set_int( frame_props, "real_width", width - left - right );
 148                 mlt_properties_set_int( frame_props, "real_height", height - top - bottom );
 149         }
 150         return frame;
 151 }
 152
 153 /** Constructor for the filter.
 154 */
 155
 156 mlt_filter filter_crop_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 157 {
 158         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 159         if ( mlt_filter_init( this, this ) == 0 )
 160         {
 161                 this->process = filter_process;
 162                 if ( arg )
 163                         mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "active", atoi( arg ) );
 164         }
 165         return this;
 166 }