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 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_watermark.h"
  22
  23 #include <framework/mlt_factory.h>
  24 #include <framework/mlt_frame.h>
  25 #include <framework/mlt_producer.h>
  26 #include <framework/mlt_transition.h>
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 /** Do it :-).
  33 */
  34
  35 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  36 {
  37         // Error we will return
  38         int error = 0;
  39
  40         // Get the watermark filter object
  41         mlt_filter this = mlt_frame_pop_service( frame );
  42
  43         // Get the properties of the filter
  44         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  45
  46         // Get the producer from the filter
  47         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  48
  49         // Get the composite from the filter
  50         mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL );
  51
  52         // Get the resource to use
  53         char *resource = mlt_properties_get( properties, "resource" );
  54
  55         // Get the old resource
  56         char *old_resource = mlt_properties_get( properties, "_old_resource" );
  57
  58         // Create a composite if we don't have one
  59         if ( composite == NULL )
  60         {
  61                 // Create composite via the factory
  62                 composite = mlt_factory_transition( "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                 // Force a refresh
  79                 mlt_properties_set_int( composite_properties, "refresh", 1 );
  80         }
  81
  82         // Create a producer if don't have one
  83         if ( producer == NULL || ( old_resource != NULL && strcmp( resource, old_resource ) ) )
  84         {
  85                 // Get the factory producer service
  86                 char *factory = mlt_properties_get( properties, "factory" );
  87
  88                 // Create the producer
  89                 producer = mlt_factory_producer( factory, resource );
  90
  91                 // If we have one
  92                 if ( producer != NULL )
  93                 {
  94                         // Register the producer for reuse/destruction
  95                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  96
  97                         // Ensure that we loop
  98                         mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
  99
 100                         // Set the old resource
 101                         mlt_properties_set( properties, "_old_resource", resource );
 102                 }
 103         }
 104
 105         if ( producer != NULL )
 106         {
 107                 // Get the producer properties
 108                 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 109
 110                 // Now pass all producer. properties on the filter down
 111                 mlt_properties_pass( producer_properties, properties, "producer." );
 112         }
 113
 114         // Only continue if we have both producer and composite
 115         if ( composite != NULL && producer != NULL )
 116         {
 117                 // Get the service of the producer
 118                 mlt_service service = MLT_PRODUCER_SERVICE( producer );
 119
 120                 // We will get the 'b frame' from the producer
 121                 mlt_frame b_frame = NULL;
 122
 123                 // Get the unique id of the filter (used to reacquire the producer position)
 124                 char *name = mlt_properties_get( properties, "_unique_id" );
 125
 126                 // Get the original producer position
 127                 mlt_position position = mlt_properties_get_position( MLT_FRAME_PROPERTIES( frame ), name );
 128
 129                 // Make sure the producer is in the correct position
 130                 mlt_producer_seek( producer, position );
 131
 132                 // Resetting position to appease the composite transition
 133                 mlt_frame_set_position( frame, position );
 134
 135                 // Get the b frame and process with composite if successful
 136                 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
 137                 {
 138                         // Get the a and b frame properties
 139                         mlt_properties a_props = MLT_FRAME_PROPERTIES( frame );
 140                         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 141
 142                         // Set the b frame to be in the same position and have same consumer requirements
 143                         mlt_frame_set_position( b_frame, position );
 144                         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 145                         mlt_properties_set_int( b_props, "consumer_deinterlace", mlt_properties_get_double( a_props, "consumer_deinterlace" ) );
 146
 147                         mlt_properties_set_int( b_props, "normalised_width", mlt_properties_get_int( a_props, "normalised_width" ) );
 148                         mlt_properties_set_int( b_props, "normalised_height", mlt_properties_get_int( a_props, "normalised_height" ) );
 149
 150                         if ( mlt_properties_get_int( properties, "distort" ) )
 151                         {
 152                                 mlt_properties_set( MLT_TRANSITION_PROPERTIES( composite ), "distort", "true" );
 153                                 mlt_properties_set( a_props, "distort", "true" );
 154                                 mlt_properties_set( b_props, "distort", "true" );
 155                         }
 156
 157                         if ( mlt_properties_get_int( properties, "reverse" ) == 0 )
 158                         {
 159                                 // Apply all filters that are attached to this filter to the b frame
 160                                 mlt_service_apply_filters( MLT_FILTER_SERVICE( this ), b_frame, 0 );
 161
 162                                 // Process the frame
 163                                 mlt_transition_process( composite, frame, b_frame );
 164
 165                                 // Get the image
 166                                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 167                         }
 168                         else
 169                         {
 170                                 char temp[ 132 ];
 171                                 int count = 0;
 172                                 uint8_t *alpha = NULL;
 173                                 mlt_transition_process( composite, b_frame, frame );
 174                                 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_int( a_props, "consumer_aspect_ratio" ) );
 175                                 mlt_properties_set_int( a_props, "consumer_deinterlace", 1 );
 176                                 mlt_properties_set_int( b_props, "consumer_deinterlace", 1 );
 177                                 mlt_properties_set( a_props, "rescale.interp", "nearest" );
 178                                 mlt_properties_set( b_props, "rescale.interp", "nearest" );
 179                                 mlt_service_apply_filters( MLT_FILTER_SERVICE( this ), b_frame, 0 );
 180                                 error = mlt_frame_get_image( b_frame, image, format, width, height, 1 );
 181                                 alpha = mlt_frame_get_alpha_mask( b_frame );
 182                                 mlt_properties_set_data( a_props, "image", *image, *width * *height * 2, NULL, NULL );
 183                                 mlt_properties_set_data( a_props, "alpha", alpha, *width * *height, NULL, NULL );
 184                                 mlt_properties_set_int( a_props, "width", *width );
 185                                 mlt_properties_set_int( a_props, "height", *height );
 186                                 mlt_properties_set_int( a_props, "progressive", 1 );
 187                                 mlt_properties_inc_ref( b_props );
 188                                 strcpy( temp, "_b_frame" );
 189                                 while( mlt_properties_get_data( a_props, temp, NULL ) != NULL )
 190                                         sprintf( temp, "_b_frame%d", count ++ );
 191                                 mlt_properties_set_data( a_props, temp, b_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 192                         }
 193                 }
 194
 195                 // Close the b frame
 196                 mlt_frame_close( b_frame );
 197         }
 198         else
 199         {
 200                 // Get the image from the frame without running fx
 201                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 202         }
 203
 204         return error;
 205 }
 206
 207 /** Filter processing.
 208 */
 209
 210 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 211 {
 212         // Get the properties of the frame
 213         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 214
 215         // Get a unique name to store the frame position
 216         char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
 217
 218         // Assign the current position to the name
 219         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) - mlt_filter_get_in( this ) );
 220
 221         // Push the filter on to the stack
 222         mlt_frame_push_service( frame, this );
 223
 224         // Push the get_image on to the stack
 225         mlt_frame_push_get_image( frame, filter_get_image );
 226
 227         return frame;
 228 }
 229
 230 /** Constructor for the filter.
 231 */
 232
 233 mlt_filter filter_watermark_init( void *arg )
 234 {
 235         mlt_filter this = mlt_filter_new( );
 236         if ( this != NULL )
 237         {
 238                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 239                 this->process = filter_process;
 240                 mlt_properties_set( properties, "factory", "fezzik" );
 241                 if ( arg != NULL )
 242                         mlt_properties_set( properties, "resource", arg );
 243                 // Ensure that attached filters are handled privately
 244                 mlt_properties_set_int( properties, "_filter_private", 1 );
 245         }
 246         return this;
 247 }
 248