git.sesse.net Git - mlt/blob - src/modules/core/filter_watermark.c

   1 /*
   2  * filter_watermark.c -- watermark filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_factory.h>
  23 #include <framework/mlt_frame.h>
  24 #include <framework/mlt_producer.h>
  25 #include <framework/mlt_transition.h>
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 /** Do it :-).
  32 */
  33
  34 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  35 {
  36         // Error we will return
  37         int error = 0;
  38
  39         // Get the watermark filter object
  40         mlt_filter this = mlt_frame_pop_service( frame );
  41
  42         // Get the properties of the filter
  43         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  44
  45         // Get the producer from the filter
  46         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  47
  48         // Get the composite from the filter
  49         mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL );
  50
  51         // Get the resource to use
  52         char *resource = mlt_properties_get( properties, "resource" );
  53
  54         // Get the old resource
  55         char *old_resource = mlt_properties_get( properties, "_old_resource" );
  56
  57         // Create a composite if we don't have one
  58         if ( composite == NULL )
  59         {
  60                 // Create composite via the factory
  61                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( this ) );
  62                 composite = mlt_factory_transition( profile, "composite", NULL );
  63
  64                 // Register the composite for reuse/destruction
  65                 if ( composite != NULL )
  66                         mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL );
  67         }
  68
  69         // If we have one
  70         if ( composite != NULL )
  71         {
  72                 // Get the properties
  73                 mlt_properties composite_properties = MLT_TRANSITION_PROPERTIES( composite );
  74
  75                 // Pass all the composite. properties on the filter down
  76                 mlt_properties_pass( composite_properties, properties, "composite." );
  77
  78                 if ( mlt_properties_get( properties, "composite.out" ) == NULL )
  79                         mlt_properties_set_int( composite_properties, "out", mlt_properties_get_int( properties, "_out" ) );
  80
  81                 // Force a refresh
  82                 mlt_properties_set_int( composite_properties, "refresh", 1 );
  83         }
  84
  85         // Create a producer if don't have one
  86         if ( producer == NULL || ( old_resource != NULL && strcmp( resource, old_resource ) ) )
  87         {
  88                 // Get the factory producer service
  89                 char *factory = mlt_properties_get( properties, "factory" );
  90
  91                 // Create the producer
  92                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( this ) );
  93                 producer = mlt_factory_producer( profile, factory, resource );
  94
  95                 // If we have one
  96                 if ( producer != NULL )
  97                 {
  98                         // Register the producer for reuse/destruction
  99                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 100
 101                         // Ensure that we loop
 102                         mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
 103
 104                         // Set the old resource
 105                         mlt_properties_set( properties, "_old_resource", resource );
 106                 }
 107         }
 108
 109         if ( producer != NULL )
 110         {
 111                 // Get the producer properties
 112                 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 113
 114                 // Now pass all producer. properties on the filter down
 115                 mlt_properties_pass( producer_properties, properties, "producer." );
 116         }
 117
 118         // Only continue if we have both producer and composite
 119         if ( composite != NULL && producer != NULL )
 120         {
 121                 // Get the service of the producer
 122                 mlt_service service = MLT_PRODUCER_SERVICE( producer );
 123
 124                 // We will get the 'b frame' from the producer
 125                 mlt_frame b_frame = NULL;
 126
 127                 // Get the unique id of the filter (used to reacquire the producer position)
 128                 char *name = mlt_properties_get( properties, "_unique_id" );
 129
 130                 // Get the original producer position
 131                 mlt_position position = mlt_properties_get_position( MLT_FRAME_PROPERTIES( frame ), name );
 132
 133                 // Make sure the producer is in the correct position
 134                 mlt_producer_seek( producer, position );
 135
 136                 // Resetting position to appease the composite transition
 137                 mlt_frame_set_position( frame, position );
 138
 139                 // Get the b frame and process with composite if successful
 140                 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
 141                 {
 142                         // Get the a and b frame properties
 143                         mlt_properties a_props = MLT_FRAME_PROPERTIES( frame );
 144                         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 145
 146                         // Set the b frame to be in the same position and have same consumer requirements
 147                         mlt_frame_set_position( b_frame, position );
 148                         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 149                         mlt_properties_set_int( b_props, "consumer_deinterlace", mlt_properties_get_int( a_props, "consumer_deinterlace" ) || mlt_properties_get_int( properties, "deinterlace" ) );
 150                         mlt_properties_set_double( b_props, "output_ratio", mlt_properties_get_double( a_props, "output_ratio" ) );
 151
 152                         // Check for the special case - no aspect ratio means no problem :-)
 153                         if ( mlt_frame_get_aspect_ratio( b_frame ) == 0 )
 154                                 mlt_properties_set_double( b_props, "aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 155                         if ( mlt_frame_get_aspect_ratio( frame ) == 0 )
 156                                 mlt_properties_set_double( a_props, "aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 157
 158                         mlt_properties_set_int( b_props, "normalised_width", mlt_properties_get_int( a_props, "normalised_width" ) );
 159                         mlt_properties_set_int( b_props, "normalised_height", mlt_properties_get_int( a_props, "normalised_height" ) );
 160
 161                         if ( mlt_properties_get_int( properties, "distort" ) )
 162                         {
 163                                 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( composite ), "distort", 1 );
 164                                 mlt_properties_set_int( a_props, "distort", 1 );
 165                                 mlt_properties_set_int( b_props, "distort", 1 );
 166                         }
 167
 168                         if ( mlt_properties_get_int( properties, "reverse" ) == 0 )
 169                         {
 170                                 // Apply all filters that are attached to this filter to the b frame
 171                                 mlt_service_apply_filters( MLT_FILTER_SERVICE( this ), b_frame, 0 );
 172
 173                                 // Process the frame
 174                                 mlt_transition_process( composite, frame, b_frame );
 175
 176                                 // Get the image
 177                                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 178                         }
 179                         else
 180                         {
 181                                 char temp[ 132 ];
 182                                 int count = 0;
 183                                 uint8_t *alpha = NULL;
 184                                 const char *rescale = mlt_properties_get( a_props, "rescale.interp" );
 185                                 if ( rescale == NULL || !strcmp( rescale, "none" ) )
 186                                         rescale = "hyper";
 187                                 mlt_transition_process( composite, b_frame, frame );
 188                                 mlt_properties_set_int( a_props, "consumer_deinterlace", 1 );
 189                                 mlt_properties_set_int( b_props, "consumer_deinterlace", 1 );
 190                                 mlt_properties_set( a_props, "rescale.interp", rescale );
 191                                 mlt_properties_set( b_props, "rescale.interp", rescale );
 192                                 mlt_service_apply_filters( MLT_FILTER_SERVICE( this ), b_frame, 0 );
 193                                 error = mlt_frame_get_image( b_frame, image, format, width, height, 1 );
 194                                 alpha = mlt_frame_get_alpha_mask( b_frame );
 195                                 mlt_properties_set_data( a_props, "image", *image, *width * *height * 2, NULL, NULL );
 196                                 mlt_properties_set_data( a_props, "alpha", alpha, *width * *height, NULL, NULL );
 197                                 mlt_properties_set_int( a_props, "width", *width );
 198                                 mlt_properties_set_int( a_props, "height", *height );
 199                                 mlt_properties_set_int( a_props, "progressive", 1 );
 200                                 mlt_properties_inc_ref( b_props );
 201                                 strcpy( temp, "_b_frame" );
 202                                 while( mlt_properties_get_data( a_props, temp, NULL ) != NULL )
 203                                         sprintf( temp, "_b_frame%d", count ++ );
 204                                 mlt_properties_set_data( a_props, temp, b_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 205                         }
 206                 }
 207
 208                 // Close the b frame
 209                 mlt_frame_close( b_frame );
 210         }
 211         else
 212         {
 213                 // Get the image from the frame without running fx
 214                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 215         }
 216
 217         return error;
 218 }
 219
 220 /** Filter processing.
 221 */
 222
 223 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 224 {
 225         // Get the properties of the frame
 226         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 227
 228         // Get a unique name to store the frame position
 229         char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
 230
 231         // Assign the frame out point to the filter (just in case we need it later)
 232         mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "_out", mlt_properties_get_int( properties, "out" ) );
 233
 234         // Assign the current position to the name
 235         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) - mlt_filter_get_in( this ) );
 236
 237         // Push the filter on to the stack
 238         mlt_frame_push_service( frame, this );
 239
 240         // Push the get_image on to the stack
 241         mlt_frame_push_get_image( frame, filter_get_image );
 242
 243         return frame;
 244 }
 245
 246 /** Constructor for the filter.
 247 */
 248
 249 mlt_filter filter_watermark_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 250 {
 251         mlt_filter this = mlt_filter_new( );
 252         if ( this != NULL )
 253         {
 254                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 255                 this->process = filter_process;
 256                 mlt_properties_set( properties, "factory", mlt_environment( "MLT_PRODUCER" ) );
 257                 if ( arg != NULL )
 258                         mlt_properties_set( properties, "resource", arg );
 259                 // Ensure that attached filters are handled privately
 260                 mlt_properties_set_int( properties, "_filter_private", 1 );
 261         }
 262         return this;
 263 }
 264