research.m1stereo.tv/gitweb/ - melted/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
  42         mlt_properties properties = mlt_frame_properties( this );
  43         int iwidth = *width;
  44         int iheight = *height;
  45         int owidth = *width;
  46         int oheight = *height;
  47         uint8_t *input = NULL;
  48         char *interps = mlt_properties_get( properties, "rescale.interp" );
  49         int interp = PIXOPS_INTERP_BILINEAR;
  50
  51         if ( strcmp( interps, "nearest" ) == 0 )
  52                 interp = PIXOPS_INTERP_NEAREST;
  53         else if ( strcmp( interps, "tiles" ) == 0 )
  54                 interp = PIXOPS_INTERP_TILES;
  55         else if ( strcmp( interps, "hyper" ) == 0 )
  56                 interp = PIXOPS_INTERP_HYPER;
  57
  58         // If real_width/height exist, we want that as minimum information
  59         if ( mlt_properties_get_int( properties, "real_width" ) )
  60         {
  61                 iwidth = mlt_properties_get_int( properties, "real_width" );
  62                 iheight = mlt_properties_get_int( properties, "real_height" );
  63         }
  64
  65         // Let the producer know what we are actually requested to obtain
  66         mlt_properties_set_int( properties, "rescale_width", *width );
  67         mlt_properties_set_int( properties, "rescale_height", *height );
  68
  69         // Get the image as requested
  70         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
  71
  72         if ( input != NULL )
  73         {
  74                 // If width and height are correct, don't do anything
  75                 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
  76                 {
  77                         // Create the output image
  78                         void *release = NULL;
  79                         uint8_t *output = mlt_pool_allocate( owidth * ( oheight + 1 ) * 2, &release );
  80
  81                         // Calculate strides
  82                         int istride = iwidth * 2;
  83                         int ostride = owidth * 2;
  84
  85                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  86
  87                         // Now update the frame
  88                         mlt_properties_set_data( properties, "image_release", release, 0, ( mlt_destructor )mlt_pool_release, NULL );
  89                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, NULL, NULL );
  90                         mlt_properties_set_int( properties, "width", owidth );
  91                         mlt_properties_set_int( properties, "height", oheight );
  92
  93                         // Return the output
  94                         *image = output;
  95                 }
  96                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
  97                 {
  98                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
  99
 100                         // Create the yuv image
 101                         void *release = NULL;
 102                         uint8_t *output = mlt_pool_allocate( owidth * ( oheight + 1 ) * 2, &release );
 103
 104                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 105                         {
 106                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 107                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 108                                         iwidth * bpp, NULL, NULL );
 109
 110                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 111                                 g_object_unref( pixbuf );
 112
 113                                 // Extract YUV422 and alpha
 114                                 if ( bpp == 4 )
 115                                 {
 116                                         // Allocate the alpha mask
 117                                         void *alpha_release = NULL;
 118                                         uint8_t *alpha = mlt_pool_allocate( owidth * ( oheight + 1 ), &alpha_release );
 119
 120                                         // Convert the image and extract alpha
 121                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 122                                                                                   owidth, oheight,
 123                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 124                                                                                   output, alpha );
 125
 126                                         mlt_properties_set_data( properties, "alpha_release", alpha_release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 127                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), NULL, NULL );
 128                                 }
 129                                 else
 130                                 {
 131                                         // No alpha to extract
 132                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 133                                                                                  owidth, oheight,
 134                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 135                                                                                  output );
 136                                 }
 137                                 g_object_unref( scaled );
 138                         }
 139                         else
 140                         {
 141                                 // Extract YUV422 and alpha
 142                                 if ( bpp == 4 )
 143                                 {
 144                                         // Allocate the alpha mask
 145                                         void *alpha_release = NULL;
 146                                         uint8_t *alpha = mlt_pool_allocate( owidth * ( oheight + 1 ), &alpha_release );
 147
 148                                         // Convert the image and extract alpha
 149                                         mlt_convert_rgb24a_to_yuv422( input,
 150                                                                                   owidth, oheight,
 151                                                                                   owidth * 4,
 152                                                                                   output, alpha );
 153
 154                                         mlt_properties_set_data( properties, "alpha_release", alpha_release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 155                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), NULL, NULL );
 156                                 }
 157                                 else
 158                                 {
 159                                         // No alpha to extract
 160                                         mlt_convert_rgb24_to_yuv422( input,
 161                                                                                  owidth, oheight,
 162                                                                                  owidth * 3,
 163                                                                                  output );
 164                                 }
 165                         }
 166
 167                         // Now update the frame
 168                         mlt_properties_set_data( properties, "image_release", release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 169                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, NULL, NULL );
 170                         mlt_properties_set_int( properties, "width", owidth );
 171                         mlt_properties_set_int( properties, "height", oheight );
 172
 173                         // Return the output
 174                         *format = mlt_image_yuv422;
 175                         *width = owidth;
 176                         *height = oheight;
 177                         *image = output;
 178                 }
 179                 else
 180                         *image = input;
 181         }
 182         else
 183                 *image = input;
 184
 185         return 0;
 186 }
 187
 188 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 189 {
 190         // Obtain properties of frame
 191         mlt_properties properties = mlt_frame_properties( this );
 192
 193         // Return the alpha mask
 194         return mlt_properties_get_data( properties, "alpha", NULL );
 195 }
 196
 197 /** Filter processing.
 198 */
 199
 200 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 201 {
 202         mlt_frame_push_get_image( frame, filter_get_image );
 203         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 204                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 205
 206         // Set alpha call back
 207         frame->get_alpha_mask = producer_get_alpha_mask;
 208         return frame;
 209 }
 210
 211 /** Constructor for the filter.
 212 */
 213
 214 mlt_filter filter_rescale_init( char *arg )
 215 {
 216         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 217         if ( mlt_filter_init( this, this ) == 0 )
 218         {
 219                 this->process = filter_process;
 220                 if ( arg != NULL )
 221                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg );
 222                 else
 223                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );
 224         }
 225         return this;
 226 }
 227