git.sesse.net Git - mlt/blob - src/modules/opengl/filter_movit_resize.cpp

   1 /*
   2  * filter_movit_resize.cpp
   3  * Copyright (C) 2013 Dan Dennedy <dan@dennedy.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <framework/mlt.h>
  21 #include <string.h>
  22 #include <math.h>
  23 #include <stdlib.h>
  24 #include <assert.h>
  25
  26 #include "filter_glsl_manager.h"
  27 #include <movit/init.h>
  28 #include <movit/padding_effect.h>
  29 #include "optional_effect.h"
  30
  31 static float alignment_parse( char* align )
  32 {
  33         int ret = 0.0f;
  34
  35         if ( align == NULL );
  36         else if ( isdigit( align[ 0 ] ) )
  37                 ret = atoi( align );
  38         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  39                 ret = 1.0f;
  40         else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
  41                 ret = 2.0f;
  42
  43         return ret;
  44 }
  45
  46 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  47 {
  48         int error = 0;
  49         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  50         mlt_filter filter = (mlt_filter) mlt_frame_pop_service( frame );
  51         mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  52
  53         // Retrieve the aspect ratio
  54         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
  55         double consumer_aspect = mlt_profile_sar( profile );
  56
  57         // Correct Width/height if necessary
  58         if ( *width == 0 || *height == 0 )
  59         {
  60                 *width = profile->width;
  61                 *height = profile->height;
  62         }
  63
  64         // Assign requested width/height from our subordinate
  65         int owidth = *width;
  66         int oheight = *height;
  67
  68         // Use a mlt_rect to compute position and size
  69         mlt_rect rect;
  70         rect.x = rect.y = 0.0;
  71         if ( mlt_properties_get( properties, "resize.rect" ) ) {
  72                 mlt_position position = mlt_filter_get_position( filter, frame );
  73                 mlt_position length = mlt_filter_get_length2( filter, frame );
  74                 rect = mlt_properties_anim_get_rect( properties, "resize.rect", position, length );
  75                 if ( strchr( mlt_properties_get( properties, "resize.rect" ), '%' ) ) {
  76                         rect.x *= profile->width;
  77                         rect.w *= profile->width;
  78                         rect.y *= profile->height;
  79                         rect.h *= profile->height;
  80                 }
  81                 if ( !mlt_properties_get_int( properties, "resize.fill" ) ) {
  82                         int x = mlt_properties_get_int( properties, "meta.media.width" );
  83                         rect.w = rect.w > x ? x : rect.w;
  84                         x = mlt_properties_get_int( properties, "meta.media.height" );
  85                         rect.h = rect.h > x ? x : rect.h;
  86                 }
  87                 owidth = lrintf( rect.w );
  88                 oheight = lrintf( rect.h );
  89         }
  90
  91         // Check for the special case - no aspect ratio means no problem :-)
  92         if ( aspect_ratio == 0.0 )
  93                 aspect_ratio = consumer_aspect;
  94
  95         // Reset the aspect ratio
  96         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
  97
  98         // Skip processing if requested.
  99         char *rescale = mlt_properties_get( properties, "rescale.interp" );
 100         if ( *format == mlt_image_none || ( rescale && !strcmp( rescale, "none" ) ) )
 101                 return mlt_frame_get_image( frame, image, format, width, height, writable );
 102
 103         if ( mlt_properties_get_int( properties, "distort" ) == 0 )
 104         {
 105                 // Normalise the input and out display aspect
 106                 int normalised_width = profile->width;
 107                 int normalised_height = profile->height;
 108                 int real_width = mlt_properties_get_int( properties, "meta.media.width" );
 109                 int real_height = mlt_properties_get_int( properties, "meta.media.height" );
 110                 if ( real_width == 0 )
 111                         real_width = mlt_properties_get_int( properties, "width" );
 112                 if ( real_height == 0 )
 113                         real_height = mlt_properties_get_int( properties, "height" );
 114                 double input_ar = aspect_ratio * real_width / real_height;
 115                 double output_ar = consumer_aspect * owidth / oheight;
 116
 117                 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
 118                 int scaled_width = lrint( ( input_ar * normalised_width ) / output_ar );
 119                 int scaled_height = normalised_height;
 120
 121                 // Now ensure that our images fit in the output frame
 122                 if ( scaled_width > normalised_width )
 123                 {
 124                         scaled_width = normalised_width;
 125                         scaled_height = lrint( ( output_ar * normalised_height ) / input_ar );
 126                 }
 127
 128                 // Now calculate the actual image size that we want
 129                 owidth = lrint( scaled_width * owidth / normalised_width );
 130                 oheight = lrint( scaled_height * oheight / normalised_height );
 131
 132                 mlt_log_debug( MLT_FILTER_SERVICE(filter),
 133                         "real %dx%d normalised %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
 134                         real_width, real_height, normalised_width, normalised_height, owidth, oheight, aspect_ratio, input_ar, output_ar);
 135
 136                 // Tell frame we have conformed the aspect to the consumer
 137                 mlt_frame_set_aspect_ratio( frame, consumer_aspect );
 138         }
 139
 140         mlt_properties_set_int( properties, "distort", 0 );
 141
 142         // Now get the image
 143         *format = mlt_image_glsl;
 144         error = mlt_frame_get_image( frame, image, format, &owidth, &oheight, writable );
 145
 146         // Offset the position according to alignment
 147         float w = float( *width - owidth );
 148         float h = float( *height - oheight );
 149         if ( mlt_properties_get( properties, "resize.rect" ) ) {
 150                 // default left if rect supplied
 151                 rect.x += w * alignment_parse( mlt_properties_get( properties, "resize.halign" ) ) / 2.0f;
 152                 rect.y += h * alignment_parse( mlt_properties_get( properties, "resize.valign" ) ) / 2.0f;
 153         } else {
 154                 // default center if no rect
 155                 rect.x = w * 0.5f;
 156                 rect.y = h * 0.5f;
 157         }
 158
 159         if ( !error ) {
 160                 mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
 161                 GlslManager::get_instance()->lock_service( frame );
 162                 mlt_properties_set_int( filter_properties, "movit.parms.int.width", *width );
 163                 mlt_properties_set_int( filter_properties, "movit.parms.int.height", *height );
 164                 mlt_properties_set_double( filter_properties, "movit.parms.float.left", rect.x );
 165                 mlt_properties_set_double( filter_properties, "movit.parms.float.top", rect.y );
 166
 167                 bool disable = ( *width == owidth && *height == oheight );
 168                 mlt_properties_set_int( filter_properties, "movit.parms.int.disable", disable );
 169
 170                 GlslManager::get_instance()->unlock_service( frame );
 171
 172                 GlslManager::set_effect_input( MLT_FILTER_SERVICE( filter ), frame, (mlt_service) *image );
 173                 GlslManager::set_effect( MLT_FILTER_SERVICE( filter ), frame, new OptionalEffect<PaddingEffect> );
 174                 *image = (uint8_t *) MLT_FILTER_SERVICE( filter );
 175                 return error;
 176         }
 177
 178         return error;
 179 }
 180
 181 static mlt_frame process( mlt_filter filter, mlt_frame frame )
 182 {
 183         mlt_frame_push_service( frame, filter );
 184         mlt_frame_push_get_image( frame, get_image );
 185         return frame;
 186 }
 187
 188 extern "C"
 189 mlt_filter filter_movit_resize_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 190 {
 191         mlt_filter filter = NULL;
 192         GlslManager* glsl = GlslManager::get_instance();
 193
 194         if ( glsl && ( filter = mlt_filter_new() ) )
 195         {
 196                 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
 197                 glsl->add_ref( properties );
 198                 filter->process = process;
 199         }
 200         return filter;
 201 }