git.sesse.net Git - mlt/blob - src/modules/gtk2/filter_rescale.c

   1 /*
   2  * filter_rescale.c -- scale the producer video frame size to match the consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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_rescale.h"
  22 #include "pixops.h"
  23
  24 #include <framework/mlt_frame.h>
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <gdk-pixbuf/gdk-pixbuf.h>
  30
  31
  32 /** Do it :-).
  33 */
  34
  35 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  36 {
  37         if ( *width == 0 )
  38                 *width = 720;
  39         if ( *height == 0 )
  40                 *height = 576;
  41         if ( *width < 2 || *height < 6 )
  42                 return 1;
  43
  44         mlt_properties properties = mlt_frame_properties( this );
  45         int iwidth = *width;
  46         int iheight = *height;
  47         int owidth = *width;
  48         int oheight = *height;
  49         uint8_t *input = NULL;
  50         char *interps = mlt_properties_get( properties, "rescale.interp" );
  51         int interp = PIXOPS_INTERP_BILINEAR;
  52
  53         if ( strcmp( interps, "nearest" ) == 0 )
  54                 interp = PIXOPS_INTERP_NEAREST;
  55         else if ( strcmp( interps, "tiles" ) == 0 )
  56                 interp = PIXOPS_INTERP_TILES;
  57         else if ( strcmp( interps, "hyper" ) == 0 )
  58                 interp = PIXOPS_INTERP_HYPER;
  59
  60         // If real_width/height exist, we want that as minimum information
  61         if ( mlt_properties_get_int( properties, "real_width" ) )
  62         {
  63                 iwidth = mlt_properties_get_int( properties, "real_width" );
  64                 iheight = mlt_properties_get_int( properties, "real_height" );
  65         }
  66
  67         // Let the producer know what we are actually requested to obtain
  68         if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) )
  69         {
  70                 mlt_properties_set_int( properties, "rescale_width", *width );
  71                 mlt_properties_set_int( properties, "rescale_height", *height );
  72         }
  73         else
  74         {
  75                 // When no scaling is requested, revert the requested dimensions if possible
  76                 mlt_properties_set_int( properties, "rescale_width", ( iwidth / 2 ) * 2 );
  77                 mlt_properties_set_int( properties, "rescale_height", ( iheight / 2 ) * 2 );
  78         }
  79
  80         // Get the image as requested
  81         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
  82
  83         if ( input != NULL )
  84         {
  85                 // If width and height are correct, don't do anything
  86                 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
  87                 {
  88                         // Create the output image
  89                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
  90
  91                         // Calculate strides
  92                         int istride = iwidth * 2;
  93                         int ostride = owidth * 2;
  94
  95                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  96
  97                         // Now update the frame
  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                         // Return the output
 103                         *image = output;
 104                 }
 105                 else if ( *format == mlt_image_yuv422 && !strcmp( interps, "none" ) )
 106                 {
 107                         // Do nothing
 108                         *width = iwidth;
 109                         *height = iheight;
 110                         *image = input;
 111                 }
 112                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
 113                 {
 114                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
 115
 116                         // Create the yuv image
 117                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
 118
 119                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 120                         {
 121                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 122                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 123                                         iwidth * bpp, NULL, NULL );
 124
 125                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 126                                 g_object_unref( pixbuf );
 127
 128                                 // Extract YUV422 and alpha
 129                                 if ( bpp == 4 )
 130                                 {
 131                                         // Allocate the alpha mask
 132                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 133
 134                                         // Convert the image and extract alpha
 135                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 136                                                                                   owidth, oheight,
 137                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 138                                                                                   output, alpha );
 139
 140                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 141                                 }
 142                                 else
 143                                 {
 144                                         // No alpha to extract
 145                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 146                                                                                  owidth, oheight,
 147                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 148                                                                                  output );
 149                                 }
 150                                 g_object_unref( scaled );
 151                         }
 152                         else
 153                         {
 154                                 // Extract YUV422 and alpha
 155                                 if ( bpp == 4 )
 156                                 {
 157                                         // Allocate the alpha mask
 158                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 159
 160                                         // Convert the image and extract alpha
 161                                         mlt_convert_rgb24a_to_yuv422( input,
 162                                                                                   owidth, oheight,
 163                                                                                   owidth * 4,
 164                                                                                   output, alpha );
 165
 166                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 167                                 }
 168                                 else
 169                                 {
 170                                         // No alpha to extract
 171                                         mlt_convert_rgb24_to_yuv422( input,
 172                                                                                  owidth, oheight,
 173                                                                                  owidth * 3,
 174                                                                                  output );
 175                                 }
 176                         }
 177
 178                         // Now update the frame
 179                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 180                         mlt_properties_set_int( properties, "width", owidth );
 181                         mlt_properties_set_int( properties, "height", oheight );
 182
 183                         // Return the output
 184                         *format = mlt_image_yuv422;
 185                         *width = owidth;
 186                         *height = oheight;
 187                         *image = output;
 188                 }
 189                 else
 190                         *image = input;
 191         }
 192         else
 193                 *image = input;
 194
 195         return 0;
 196 }
 197
 198 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 199 {
 200         // Obtain properties of frame
 201         mlt_properties properties = mlt_frame_properties( this );
 202
 203         // Return the alpha mask
 204         return mlt_properties_get_data( properties, "alpha", NULL );
 205 }
 206
 207 /** Filter processing.
 208 */
 209
 210 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 211 {
 212         mlt_frame_push_get_image( frame, filter_get_image );
 213         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 214                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 215
 216         // Set alpha call back
 217         frame->get_alpha_mask = producer_get_alpha_mask;
 218         return frame;
 219 }
 220
 221 /** Constructor for the filter.
 222 */
 223
 224 mlt_filter filter_rescale_init( char *arg )
 225 {
 226         mlt_filter this = mlt_filter_new( );
 227         if ( this != NULL )
 228         {
 229                 this->process = filter_process;
 230                 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg == NULL ? "bilinear" : arg );
 231         }
 232         return this;
 233 }