research.m1stereo.tv/gitweb/ - melted/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
  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         // Create a composite if we don't have one
  52         if ( composite == NULL )
  53         {
  54                 // Create composite via the factory
  55                 composite = mlt_factory_transition( "composite", NULL );
  56
  57                 // Register the composite for reuse/destruction
  58                 if ( composite != NULL )
  59                         mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL );
  60         }
  61
  62         // If we have one
  63         if ( composite != NULL )
  64         {
  65                 // Get the properties
  66                 mlt_properties composite_properties = mlt_transition_properties( composite );
  67
  68                 // Pass all the composite. properties on the filter down
  69                 mlt_properties_pass( composite_properties, properties, "composite." );
  70         }
  71
  72         // Create a producer if don't have one
  73         if ( producer == NULL )
  74         {
  75                 // Get the resource to use
  76                 char *resource = mlt_properties_get( properties, "resource" );
  77
  78                 // Get the factory producer service
  79                 char *factory = mlt_properties_get( properties, "factory" );
  80
  81                 // Create the producer
  82                 producer = mlt_factory_producer( factory, resource );
  83
  84                 // If we have one
  85                 if ( producer != NULL )
  86                 {
  87                         // Register the producer for reuse/destruction
  88                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  89
  90                         // Ensure that we loop
  91                         mlt_properties_set( mlt_producer_properties( producer ), "eof", "loop" );
  92                 }
  93         }
  94
  95         if ( producer != NULL )
  96         {
  97                 // Get the producer properties
  98                 mlt_properties producer_properties = mlt_producer_properties( producer );
  99
 100                 // Now pass all producer. properties on the filter down
 101                 mlt_properties_pass( producer_properties, properties, "producer." );
 102         }
 103
 104         // Only continue if we have both producer and composite
 105         if ( composite != NULL && producer != NULL )
 106         {
 107                 // Get the service of the producer
 108                 mlt_service service = mlt_producer_service( producer );
 109
 110                 // We will get the 'b frame' from the producer
 111                 mlt_frame b_frame = NULL;
 112
 113                 // Get the unique id of the filter (used to reacquire the producer position)
 114                 char *name = mlt_properties_get( properties, "_unique_id" );
 115
 116                 // Get the original producer position
 117                 mlt_position position = mlt_properties_get_position( mlt_frame_properties( frame ), name );
 118
 119                 // Make sure the producer is in the correct position
 120                 mlt_producer_seek( producer, position );
 121
 122                 // Resetting position to appease the composite transition
 123                 mlt_frame_set_position( frame, position );
 124
 125                 // Get the b frame and process with composite if successful
 126                 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
 127                         mlt_transition_process( composite, frame, b_frame );
 128
 129                 // Get the image
 130                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 131
 132                 // Close the b frame
 133                 mlt_frame_close( b_frame );
 134         }
 135         else
 136         {
 137                 // Get the image from the frame without running fx
 138                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 139         }
 140
 141         return error;
 142 }
 143
 144 /** Filter processing.
 145 */
 146
 147 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 148 {
 149         // Get the properties of the frame
 150         mlt_properties properties = mlt_frame_properties( frame );
 151
 152         // Get a unique name to store the frame position
 153         char *name = mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
 154
 155         // Assign the current position to the name
 156         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) );
 157
 158         // Push the filter on to the stack
 159         mlt_frame_push_service( frame, this );
 160
 161         // Push the get_image on to the stack
 162         mlt_frame_push_get_image( frame, filter_get_image );
 163
 164         return frame;
 165 }
 166
 167 /** Constructor for the filter.
 168 */
 169
 170 mlt_filter filter_watermark_init( void *arg )
 171 {
 172         mlt_filter this = mlt_filter_new( );
 173         if ( this != NULL )
 174         {
 175                 mlt_properties properties = mlt_filter_properties( this );
 176                 this->process = filter_process;
 177                 mlt_properties_set( properties, "factory", "fezzik" );
 178                 if ( arg != NULL )
 179                         mlt_properties_set( properties, "resource", arg );
 180         }
 181         return this;
 182 }
 183