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