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 using namespace movit;
  32
  33 static float alignment_parse( char* align )
  34 {
  35         int ret = 0.0f;
  36
  37         if ( align == NULL );
  38         else if ( isdigit( align[ 0 ] ) )
  39                 ret = atoi( align );
  40         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  41                 ret = 1.0f;
  42         else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
  43                 ret = 2.0f;
  44
  45         return ret;
  46 }
  47
  48 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  49 {
  50         int error = 0;
  51         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  52         mlt_filter filter = (mlt_filter) mlt_frame_pop_service( frame );
  53         mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  54
  55         // Retrieve the aspect ratio
  56         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
  57         double consumer_aspect = mlt_profile_sar( profile );
  58
  59         // Correct Width/height if necessary
  60         if ( *width == 0 || *height == 0 )
  61         {
  62                 *width = profile->width;
  63                 *height = profile->height;
  64         }
  65
  66         // Assign requested width/height from our subordinate
  67         int owidth = *width;
  68         int oheight = *height;
  69
  70         // Use a mlt_rect to compute position and size
  71         mlt_rect rect;
  72         rect.x = rect.y = 0.0;
  73         if ( mlt_properties_get( properties, "resize.rect" ) ) {
  74                 mlt_position position = mlt_filter_get_position( filter, frame );
  75                 mlt_position length = mlt_filter_get_length2( filter, frame );
  76                 rect = mlt_properties_anim_get_rect( properties, "resize.rect", position, length );
  77                 if ( strchr( mlt_properties_get( properties, "resize.rect" ), '%' ) ) {
  78                         rect.x *= profile->width;
  79                         rect.w *= profile->width;
  80                         rect.y *= profile->height;
  81                         rect.h *= profile->height;
  82                 }
  83                 if ( !mlt_properties_get_int( properties, "resize.fill" ) ) {
  84                         int x = mlt_properties_get_int( properties, "meta.media.width" );
  85                         rect.w = rect.w > x ? x : rect.w;
  86                         x = mlt_properties_get_int( properties, "meta.media.height" );
  87                         rect.h = rect.h > x ? x : rect.h;
  88                 }
  89                 owidth = lrintf( rect.w );
  90                 oheight = lrintf( rect.h );
  91         }
  92
  93         // Check for the special case - no aspect ratio means no problem :-)
  94         if ( aspect_ratio == 0.0 )
  95                 aspect_ratio = consumer_aspect;
  96
  97         // Reset the aspect ratio
  98         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
  99
 100         // Skip processing if requested.
 101         char *rescale = mlt_properties_get( properties, "rescale.interp" );
 102         if ( *format == mlt_image_none || ( rescale && !strcmp( rescale, "none" ) ) )
 103                 return mlt_frame_get_image( frame, image, format, width, height, writable );
 104
 105         if ( mlt_properties_get_int( properties, "distort" ) == 0 )
 106         {
 107                 // Normalise the input and out display aspect
 108                 int normalised_width = profile->width;
 109                 int normalised_height = profile->height;
 110                 int real_width = mlt_properties_get_int( properties, "meta.media.width" );
 111                 int real_height = mlt_properties_get_int( properties, "meta.media.height" );
 112                 if ( real_width == 0 )
 113                         real_width = mlt_properties_get_int( properties, "width" );
 114                 if ( real_height == 0 )
 115                         real_height = mlt_properties_get_int( properties, "height" );
 116                 double input_ar = aspect_ratio * real_width / real_height;
 117                 double output_ar = consumer_aspect * owidth / oheight;
 118
 119                 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
 120                 int scaled_width = lrint( ( input_ar * normalised_width ) / output_ar );
 121                 int scaled_height = normalised_height;
 122
 123                 // Now ensure that our images fit in the output frame
 124                 if ( scaled_width > normalised_width )
 125                 {
 126                         scaled_width = normalised_width;
 127                         scaled_height = lrint( ( output_ar * normalised_height ) / input_ar );
 128                 }
 129
 130                 // Now calculate the actual image size that we want
 131                 owidth = lrint( scaled_width * owidth / normalised_width );
 132                 oheight = lrint( scaled_height * oheight / normalised_height );
 133
 134                 mlt_log_debug( MLT_FILTER_SERVICE(filter),
 135                         "real %dx%d normalised %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
 136                         real_width, real_height, normalised_width, normalised_height, owidth, oheight, aspect_ratio, input_ar, output_ar);
 137
 138                 // Tell frame we have conformed the aspect to the consumer
 139                 mlt_frame_set_aspect_ratio( frame, consumer_aspect );
 140         }
 141
 142         mlt_properties_set_int( properties, "distort", 0 );
 143
 144         // Now get the image
 145         *format = mlt_image_glsl;
 146         error = mlt_frame_get_image( frame, image, format, &owidth, &oheight, writable );
 147
 148         // Offset the position according to alignment
 149         float w = float( *width - owidth );
 150         float h = float( *height - oheight );
 151         if ( mlt_properties_get( properties, "resize.rect" ) ) {
 152                 // default left if rect supplied
 153                 rect.x += w * alignment_parse( mlt_properties_get( properties, "resize.halign" ) ) / 2.0f;
 154                 rect.y += h * alignment_parse( mlt_properties_get( properties, "resize.valign" ) ) / 2.0f;
 155         } else {
 156                 // default center if no rect
 157                 rect.x = w * 0.5f;
 158                 rect.y = h * 0.5f;
 159         }
 160
 161         if ( !error ) {
 162                 mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
 163                 GlslManager::get_instance()->lock_service( frame );
 164                 mlt_properties_set_int( filter_properties, "movit.parms.int.width", *width );
 165                 mlt_properties_set_int( filter_properties, "movit.parms.int.height", *height );
 166                 mlt_properties_set_double( filter_properties, "movit.parms.float.left", rect.x );
 167                 mlt_properties_set_double( filter_properties, "movit.parms.float.top", rect.y );
 168
 169                 bool disable = ( *width == owidth && *height == oheight );
 170                 mlt_properties_set_int( filter_properties, "movit.parms.int.disable", disable );
 171
 172                 GlslManager::get_instance()->unlock_service( frame );
 173
 174                 GlslManager::set_effect_input( MLT_FILTER_SERVICE( filter ), frame, (mlt_service) *image );
 175                 GlslManager::set_effect( MLT_FILTER_SERVICE( filter ), frame, new OptionalEffect<PaddingEffect> );
 176                 *image = (uint8_t *) MLT_FILTER_SERVICE( filter );
 177                 return error;
 178         }
 179
 180         return error;
 181 }
 182
 183 static mlt_frame process( mlt_filter filter, mlt_frame frame )
 184 {
 185         mlt_frame_push_service( frame, filter );
 186         mlt_frame_push_get_image( frame, get_image );
 187         return frame;
 188 }
 189
 190 extern "C"
 191 mlt_filter filter_movit_resize_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 192 {
 193         mlt_filter filter = NULL;
 194         GlslManager* glsl = GlslManager::get_instance();
 195
 196         if ( glsl && ( filter = mlt_filter_new() ) )
 197         {
 198                 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
 199                 glsl->add_ref( properties );
 200                 filter->process = process;
 201         }
 202         return filter;
 203 }