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 this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  35 {
  36         int error = 0;
  37         mlt_filter filter = mlt_frame_pop_service( this );
  38         mlt_properties properties = mlt_filter_properties( filter );
  39         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  40         mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL );
  41         char *name = mlt_properties_get( properties, "_unique_id" );
  42
  43         if ( composite == NULL )
  44         {
  45                 composite = mlt_factory_transition( "composite", NULL );
  46                 if ( composite != NULL )
  47                 {
  48                         mlt_properties composite_properties = mlt_transition_properties( composite );
  49                         mlt_properties_pass( composite_properties, properties, "composite." );
  50                         mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL );
  51                 }
  52         }
  53
  54         if ( producer == NULL )
  55         {
  56                 char *resource = mlt_properties_get( properties, "resource" );
  57                 char *factory = mlt_properties_get( properties, "factory" );
  58                 producer = mlt_factory_producer( factory, resource );
  59                 if ( producer != NULL )
  60                 {
  61                         mlt_properties producer_properties = mlt_producer_properties( producer );
  62                         mlt_properties_set( producer_properties, "eof", "loop" );
  63                         mlt_properties_pass( producer_properties, properties, "producer." );
  64                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  65                 }
  66         }
  67
  68         if ( composite != NULL && producer != NULL )
  69         {
  70                 mlt_service service = mlt_producer_service( producer );
  71                 mlt_frame b_frame = NULL;
  72                 mlt_properties frame_properties = mlt_frame_properties( this );
  73                 mlt_position position = mlt_properties_get_position( frame_properties, name );
  74
  75                 mlt_producer_seek( producer, position );
  76                 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
  77                         mlt_transition_process( composite, this, b_frame );
  78
  79                 error = mlt_frame_get_image( this, image, format, width, height, 1 );
  80
  81                 mlt_frame_close( b_frame );
  82         }
  83         else
  84         {
  85                 error = mlt_frame_get_image( this, image, format, width, height, 1 );
  86         }
  87
  88         return error;
  89 }
  90
  91 /** Filter processing.
  92 */
  93
  94 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  95 {
  96         // Get the properties of the frame
  97         mlt_properties properties = mlt_frame_properties( frame );
  98
  99         // Get a unique name to store the frame position
 100         char *name = mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
 101
 102         // Assign the current position to the name
 103         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) );
 104
 105         // Push the filter on to the stack
 106         mlt_frame_push_service( frame, this );
 107
 108         // Push the get_image on to the stack
 109         mlt_frame_push_get_image( frame, filter_get_image );
 110
 111         return frame;
 112 }
 113
 114 /** Constructor for the filter.
 115 */
 116
 117 mlt_filter filter_watermark_init( void *arg )
 118 {
 119         mlt_filter this = mlt_filter_new( );
 120         if ( this != NULL )
 121         {
 122                 mlt_properties properties = mlt_filter_properties( this );
 123                 this->process = filter_process;
 124                 mlt_properties_set( properties, "factory", "fezzik" );
 125                 if ( arg != NULL )
 126                         mlt_properties_set( properties, "resource", arg );
 127         }
 128         return this;
 129 }
 130