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
  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         double i_aspect_ratio = mlt_frame_get_aspect_ratio( this );
  51         double o_aspect_ratio = mlt_properties_get_double( properties, "consumer_aspect_ratio" );
  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         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
  61
  62         if ( o_aspect_ratio != 0 && o_aspect_ratio != i_aspect_ratio && mlt_properties_get( properties, "distort" ) == NULL )
  63         {
  64                 int temp_width = i_aspect_ratio / o_aspect_ratio * owidth + 0.5;
  65
  66                 // Determine maximum size within the aspect ratio:
  67                 if ( temp_width > owidth )
  68                         if ( i_aspect_ratio > o_aspect_ratio )
  69                                 oheight = o_aspect_ratio / i_aspect_ratio * oheight + 0.5;
  70                         else
  71                                 oheight = i_aspect_ratio / o_aspect_ratio * oheight + 0.5;
  72                 else
  73                         owidth = temp_width;
  74
  75                 // Tell frame we have conformed the aspect to the consumer
  76                 mlt_frame_set_aspect_ratio( this, o_aspect_ratio );
  77         }
  78         //fprintf( stderr, "rescale: from %dx%d (aspect %f) to %dx%d (aspect %f)\n", iwidth, iheight, i_aspect_ratio, owidth, oheight, o_aspect_ratio );
  79
  80         if ( input != NULL )
  81         {
  82                 // If width and height are correct, don't do anything
  83                 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
  84                 {
  85                         // Create the output image
  86                         // IRRIGATE ME
  87                         uint8_t *output = malloc( owidth * ( oheight + 1 ) * 2 );
  88
  89                         // Calculate strides
  90                         int istride = iwidth * 2;
  91                         int ostride = owidth * 2;
  92
  93                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  94
  95                         // Now update the frame
  96                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, free, NULL );
  97                         mlt_properties_set_int( properties, "width", owidth );
  98                         mlt_properties_set_int( properties, "height", oheight );
  99
 100                         // Return the output
 101                         *image = output;
 102                 }
 103                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
 104                 {
 105                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
 106
 107                         // Create the yuv image
 108                         // IRRIGATE ME
 109                         uint8_t *output = malloc( owidth * ( oheight + 1 ) * 2 );
 110
 111                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 112                         {
 113                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 114                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 115                                         iwidth * bpp, NULL, NULL );
 116
 117                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 118                                 g_object_unref( pixbuf );
 119
 120                                 // Extract YUV422 and alpha
 121                                 if ( bpp == 4 )
 122                                 {
 123                                         // Allocate the alpha mask
 124                                         // IRRIGATE ME
 125                                         uint8_t *alpha = malloc( owidth * ( oheight + 1 ) );
 126
 127                                         // Convert the image and extract alpha
 128                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 129                                                                                   owidth, oheight,
 130                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 131                                                                                   output, alpha );
 132
 133                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), free, NULL );
 134                                 }
 135                                 else
 136                                 {
 137                                         // No alpha to extract
 138                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 139                                                                                  owidth, oheight,
 140                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 141                                                                                  output );
 142                                 }
 143                                 g_object_unref( scaled );
 144                         }
 145                         else
 146                         {
 147                                 // Extract YUV422 and alpha
 148                                 if ( bpp == 4 )
 149                                 {
 150                                         // Allocate the alpha mask
 151                                         // IRRIGATE ME
 152                                         uint8_t *alpha = malloc( owidth * ( oheight + 1 ) );
 153
 154                                         // Convert the image and extract alpha
 155                                         mlt_convert_rgb24a_to_yuv422( input,
 156                                                                                   owidth, oheight,
 157                                                                                   owidth * 4,
 158                                                                                   output, alpha );
 159
 160                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), free, NULL );
 161                                 }
 162                                 else
 163                                 {
 164                                         // No alpha to extract
 165                                         mlt_convert_rgb24_to_yuv422( input,
 166                                                                                  owidth, oheight,
 167                                                                                  owidth * 3,
 168                                                                                  output );
 169                                 }
 170                         }
 171
 172                         // Now update the frame
 173                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, free, NULL );
 174                         mlt_properties_set_int( properties, "width", owidth );
 175                         mlt_properties_set_int( properties, "height", oheight );
 176
 177                         // Return the output
 178                         *width = owidth;
 179                         *height = oheight;
 180                         *image = output;
 181                 }
 182                 else
 183                         *image = input;
 184         }
 185         else
 186                 *image = input;
 187
 188         return 0;
 189 }
 190
 191 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 192 {
 193         // Obtain properties of frame
 194         mlt_properties properties = mlt_frame_properties( this );
 195
 196         // Return the alpha mask
 197         return mlt_properties_get_data( properties, "alpha", NULL );
 198 }
 199
 200 /** Filter processing.
 201 */
 202
 203 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 204 {
 205         mlt_frame_push_get_image( frame, filter_get_image );
 206         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 207                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 208
 209         // Set alpha call back
 210         frame->get_alpha_mask = producer_get_alpha_mask;
 211         return frame;
 212 }
 213
 214 /** Constructor for the filter.
 215 */
 216
 217 mlt_filter filter_rescale_init( char *arg )
 218 {
 219         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 220         if ( mlt_filter_init( this, this ) == 0 )
 221         {
 222                 this->process = filter_process;
 223                 if ( arg != NULL )
 224                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg );
 225                 else
 226                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );
 227         }
 228         return this;
 229 }
 230