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
  30 static float alignment_parse( char* align )
  31 {
  32         int ret = 0.0f;
  33
  34         if ( align == NULL );
  35         else if ( isdigit( align[ 0 ] ) )
  36                 ret = atoi( align );
  37         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  38                 ret = 1.0f;
  39         else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
  40                 ret = 2.0f;
  41
  42         return ret;
  43 }
  44
  45 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  46 {
  47         int error = 0;
  48         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  49         mlt_filter filter = (mlt_filter) mlt_frame_pop_service( frame );
  50         mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  51
  52         // Retrieve the aspect ratio
  53         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
  54         double consumer_aspect = mlt_profile_sar( profile );
  55
  56         // Correct Width/height if necessary
  57         if ( *width == 0 || *height == 0 )
  58         {
  59                 *width = profile->width;
  60                 *height = profile->height;
  61         }
  62
  63         // Assign requested width/height from our subordinate
  64         int owidth = *width;
  65         int oheight = *height;
  66
  67         // Use a mlt_rect to compute position and size
  68         mlt_rect rect;
  69         rect.x = rect.y = 0.0;
  70         if ( mlt_properties_get( properties, "resize.rect" ) ) {
  71                 mlt_position position = mlt_filter_get_position( filter, frame );
  72                 mlt_position length = mlt_filter_get_length2( filter, frame );
  73                 rect = mlt_properties_anim_get_rect( properties, "resize.rect", position, length );
  74                 if ( strchr( mlt_properties_get( properties, "resize.rect" ), '%' ) ) {
  75                         rect.x *= profile->width;
  76                         rect.w *= profile->width;
  77                         rect.y *= profile->height;
  78                         rect.h *= profile->height;
  79                 }
  80                 if ( !mlt_properties_get_int( properties, "resize.fill" ) ) {
  81                         int x = mlt_properties_get_int( properties, "meta.media.width" );
  82                         rect.w = rect.w > x ? x : rect.w;
  83                         x = mlt_properties_get_int( properties, "meta.media.height" );
  84                         rect.h = rect.h > x ? x : rect.h;
  85                 }
  86                 owidth = lrintf( rect.w );
  87                 oheight = lrintf( rect.h );
  88         }
  89
  90         // Check for the special case - no aspect ratio means no problem :-)
  91         if ( aspect_ratio == 0.0 )
  92                 aspect_ratio = consumer_aspect;
  93
  94         // Reset the aspect ratio
  95         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
  96
  97         // Skip processing if requested.
  98         char *rescale = mlt_properties_get( properties, "rescale.interp" );
  99         if ( *format == mlt_image_none || ( rescale && !strcmp( rescale, "none" ) ) )
 100                 return mlt_frame_get_image( frame, image, format, width, height, writable );
 101
 102         if ( mlt_properties_get_int( properties, "distort" ) == 0 )
 103         {
 104                 // Normalise the input and out display aspect
 105                 int normalised_width = profile->width;
 106                 int normalised_height = profile->height;
 107                 int real_width = mlt_properties_get_int( properties, "meta.media.width" );
 108                 int real_height = mlt_properties_get_int( properties, "meta.media.height" );
 109                 if ( real_width == 0 )
 110                         real_width = mlt_properties_get_int( properties, "width" );
 111                 if ( real_height == 0 )
 112                         real_height = mlt_properties_get_int( properties, "height" );
 113                 double input_ar = aspect_ratio * real_width / real_height;
 114                 double output_ar = consumer_aspect * owidth / oheight;
 115
 116                 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
 117                 int scaled_width = lrint( ( input_ar * normalised_width ) / output_ar );
 118                 int scaled_height = normalised_height;
 119
 120                 // Now ensure that our images fit in the output frame
 121                 if ( scaled_width > normalised_width )
 122                 {
 123                         scaled_width = normalised_width;
 124                         scaled_height = lrint( ( output_ar * normalised_height ) / input_ar );
 125                 }
 126
 127                 // Now calculate the actual image size that we want
 128                 owidth = lrint( scaled_width * owidth / normalised_width );
 129                 oheight = lrint( scaled_height * oheight / normalised_height );
 130
 131                 mlt_log_debug( MLT_FILTER_SERVICE(filter),
 132                         "real %dx%d normalised %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
 133                         real_width, real_height, normalised_width, normalised_height, owidth, oheight, aspect_ratio, input_ar, output_ar);
 134
 135                 // Tell frame we have conformed the aspect to the consumer
 136                 mlt_frame_set_aspect_ratio( frame, consumer_aspect );
 137         }
 138
 139         mlt_properties_set_int( properties, "distort", 0 );
 140
 141         // Now get the image
 142         *format = mlt_image_glsl;
 143         error = mlt_frame_get_image( frame, image, format, &owidth, &oheight, writable );
 144
 145         // Offset the position according to alignment
 146         float w = float( *width - owidth );
 147         float h = float( *height - oheight );
 148         if ( mlt_properties_get( properties, "resize.rect" ) ) {
 149                 // default left if rect supplied
 150                 rect.x += w * alignment_parse( mlt_properties_get( properties, "resize.halign" ) ) / 2.0f;
 151                 rect.y += h * alignment_parse( mlt_properties_get( properties, "resize.valign" ) ) / 2.0f;
 152         } else {
 153                 // default center if no rect
 154                 rect.x = w * 0.5f;
 155                 rect.y = h * 0.5f;
 156         }
 157
 158         if ( !error ) {
 159                 GlslManager::get_instance()->lock_service( frame );
 160                 Effect* effect = GlslManager::get_effect( MLT_FILTER_SERVICE( filter ), frame );
 161                 if ( effect ) {
 162                         bool ok = effect->set_int( "width", *width );
 163                         ok |= effect->set_int( "height", *height );
 164                         ok |= effect->set_float( "left", rect.x );
 165                         ok |= effect->set_float( "top", rect.y );
 166                         assert(ok);
 167                 }
 168                 GlslManager::get_instance()->unlock_service( frame );
 169         }
 170
 171         return error;
 172 }
 173
 174 static mlt_frame process( mlt_filter filter, mlt_frame frame )
 175 {
 176         if ( !GlslManager::get_effect( MLT_FILTER_SERVICE( filter ), frame ) )
 177                 GlslManager::add_effect( MLT_FILTER_SERVICE( filter ), frame, new PaddingEffect );
 178         mlt_frame_push_service( frame, filter );
 179         mlt_frame_push_get_image( frame, get_image );
 180         return frame;
 181 }
 182
 183 extern "C"
 184 mlt_filter filter_movit_resize_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 185 {
 186         mlt_filter filter = NULL;
 187         GlslManager* glsl = GlslManager::get_instance();
 188
 189         if ( glsl && ( filter = mlt_filter_new() ) )
 190         {
 191                 filter->process = process;
 192         }
 193         return filter;
 194 }