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 #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
  79         // Create a producer if don't have one
  80         if ( producer == NULL || ( old_resource != NULL && strcmp( resource, old_resource ) ) )
  81         {
  82                 // Get the factory producer service
  83                 char *factory = mlt_properties_get( properties, "factory" );
  84
  85                 // Create the producer
  86                 producer = mlt_factory_producer( factory, resource );
  87
  88                 // If we have one
  89                 if ( producer != NULL )
  90                 {
  91                         // Register the producer for reuse/destruction
  92                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  93
  94                         // Ensure that we loop
  95                         mlt_properties_set( mlt_producer_properties( producer ), "eof", "loop" );
  96
  97                         // Set the old resource
  98                         mlt_properties_set( properties, "_old_resource", resource );
  99                 }
 100         }
 101
 102         if ( producer != NULL )
 103         {
 104                 // Get the producer properties
 105                 mlt_properties producer_properties = mlt_producer_properties( producer );
 106
 107                 // Now pass all producer. properties on the filter down
 108                 mlt_properties_pass( producer_properties, properties, "producer." );
 109         }
 110
 111         // Only continue if we have both producer and composite
 112         if ( composite != NULL && producer != NULL )
 113         {
 114                 // Get the service of the producer
 115                 mlt_service service = mlt_producer_service( producer );
 116
 117                 // We will get the 'b frame' from the producer
 118                 mlt_frame b_frame = NULL;
 119
 120                 // Get the unique id of the filter (used to reacquire the producer position)
 121                 char *name = mlt_properties_get( properties, "_unique_id" );
 122
 123                 // Get the original producer position
 124                 mlt_position position = mlt_properties_get_position( mlt_frame_properties( frame ), name );
 125
 126                 // Make sure the producer is in the correct position
 127                 mlt_producer_seek( producer, position );
 128
 129                 // Resetting position to appease the composite transition
 130                 mlt_frame_set_position( frame, position );
 131
 132                 // Get the b frame and process with composite if successful
 133                 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
 134                         mlt_transition_process( composite, frame, b_frame );
 135
 136                 // Get the image
 137                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 138
 139                 // Close the b frame
 140                 mlt_frame_close( b_frame );
 141         }
 142         else
 143         {
 144                 // Get the image from the frame without running fx
 145                 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 146         }
 147
 148         return error;
 149 }
 150
 151 /** Filter processing.
 152 */
 153
 154 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 155 {
 156         // Get the properties of the frame
 157         mlt_properties properties = mlt_frame_properties( frame );
 158
 159         // Get a unique name to store the frame position
 160         char *name = mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
 161
 162         // Assign the current position to the name
 163         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) );
 164
 165         // Push the filter on to the stack
 166         mlt_frame_push_service( frame, this );
 167
 168         // Push the get_image on to the stack
 169         mlt_frame_push_get_image( frame, filter_get_image );
 170
 171         return frame;
 172 }
 173
 174 /** Constructor for the filter.
 175 */
 176
 177 mlt_filter filter_watermark_init( void *arg )
 178 {
 179         mlt_filter this = mlt_filter_new( );
 180         if ( this != NULL )
 181         {
 182                 mlt_properties properties = mlt_filter_properties( this );
 183                 this->process = filter_process;
 184                 mlt_properties_set( properties, "factory", "fezzik" );
 185                 if ( arg != NULL )
 186                         mlt_properties_set( properties, "resource", arg );
 187         }
 188         return this;
 189 }
 190