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 real_width/height exist, we want that as minimum information
  54         if ( mlt_properties_get_int( properties, "real_width" ) )
  55         {
  56                 iwidth = mlt_properties_get_int( properties, "real_width" );
  57                 iheight = mlt_properties_get_int( properties, "real_height" );
  58         }
  59
  60         // Let the producer know what we are actually requested to obtain
  61         if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) )
  62         {
  63                 mlt_properties_set_int( properties, "rescale_width", *width );
  64                 mlt_properties_set_int( properties, "rescale_height", *height );
  65         }
  66         else
  67         {
  68                 // When no scaling is requested, revert the requested dimensions if possible
  69                 mlt_properties_set_int( properties, "rescale_width", ( iwidth / 2 ) * 2 );
  70                 mlt_properties_set_int( properties, "rescale_height", ( iheight / 2 ) * 2 );
  71         }
  72
  73         // Get the image as requested
  74         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
  75
  76         // Get rescale interpretation again, in case the producer wishes to override scaling
  77         interps = mlt_properties_get( properties, "rescale.interp" );
  78
  79         if ( strcmp( interps, "nearest" ) == 0 )
  80                 interp = PIXOPS_INTERP_NEAREST;
  81         else if ( strcmp( interps, "tiles" ) == 0 )
  82                 interp = PIXOPS_INTERP_TILES;
  83         else if ( strcmp( interps, "hyper" ) == 0 )
  84                 interp = PIXOPS_INTERP_HYPER;
  85
  86         if ( input != NULL )
  87         {
  88                 // If width and height are correct, don't do anything
  89                 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
  90                 {
  91                         // Create the output image
  92                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
  93
  94                         // Calculate strides
  95                         int istride = iwidth * 2;
  96                         int ostride = owidth * 2;
  97
  98                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  99
 100                         // Now update the frame
 101                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 102                         mlt_properties_set_int( properties, "width", owidth );
 103                         mlt_properties_set_int( properties, "height", oheight );
 104
 105                         // Return the output
 106                         *image = output;
 107                 }
 108                 else if ( *format == mlt_image_yuv422 && !strcmp( interps, "none" ) )
 109                 {
 110                         // Do nothing
 111                         *width = iwidth;
 112                         *height = iheight;
 113                         *image = input;
 114                 }
 115                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
 116                 {
 117                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
 118
 119                         // Create the yuv image
 120                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
 121
 122                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 123                         {
 124                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 125                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 126                                         iwidth * bpp, NULL, NULL );
 127
 128                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 129                                 g_object_unref( pixbuf );
 130
 131                                 // Extract YUV422 and alpha
 132                                 if ( bpp == 4 )
 133                                 {
 134                                         // Allocate the alpha mask
 135                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 136
 137                                         // Convert the image and extract alpha
 138                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 139                                                                                   owidth, oheight,
 140                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 141                                                                                   output, alpha );
 142
 143                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 144                                 }
 145                                 else
 146                                 {
 147                                         // No alpha to extract
 148                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 149                                                                                  owidth, oheight,
 150                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 151                                                                                  output );
 152                                 }
 153                                 g_object_unref( scaled );
 154                         }
 155                         else
 156                         {
 157                                 // Extract YUV422 and alpha
 158                                 if ( bpp == 4 )
 159                                 {
 160                                         // Allocate the alpha mask
 161                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 162
 163                                         // Convert the image and extract alpha
 164                                         mlt_convert_rgb24a_to_yuv422( input,
 165                                                                                   owidth, oheight,
 166                                                                                   owidth * 4,
 167                                                                                   output, alpha );
 168
 169                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 170                                 }
 171                                 else
 172                                 {
 173                                         // No alpha to extract
 174                                         mlt_convert_rgb24_to_yuv422( input,
 175                                                                                  owidth, oheight,
 176                                                                                  owidth * 3,
 177                                                                                  output );
 178                                 }
 179                         }
 180
 181                         // Now update the frame
 182                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 183                         mlt_properties_set_int( properties, "width", owidth );
 184                         mlt_properties_set_int( properties, "height", oheight );
 185
 186                         // Return the output
 187                         *format = mlt_image_yuv422;
 188                         *width = owidth;
 189                         *height = oheight;
 190                         *image = output;
 191                 }
 192                 else
 193                         *image = input;
 194         }
 195         else
 196                 *image = input;
 197
 198         return 0;
 199 }
 200
 201 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 202 {
 203         // Obtain properties of frame
 204         mlt_properties properties = mlt_frame_properties( this );
 205
 206         // Return the alpha mask
 207         return mlt_properties_get_data( properties, "alpha", NULL );
 208 }
 209
 210 /** Filter processing.
 211 */
 212
 213 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 214 {
 215         mlt_frame_push_get_image( frame, filter_get_image );
 216         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 217                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 218
 219         // Set alpha call back
 220         frame->get_alpha_mask = producer_get_alpha_mask;
 221         return frame;
 222 }
 223
 224 /** Constructor for the filter.
 225 */
 226
 227 mlt_filter filter_rescale_init( char *arg )
 228 {
 229         mlt_filter this = mlt_filter_new( );
 230         if ( this != NULL )
 231         {
 232                 this->process = filter_process;
 233                 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg == NULL ? "bilinear" : arg );
 234         }
 235         return this;
 236 }