research.m1stereo.tv/gitweb/ - melted/blob - src/modules/kdenlive/filter_freeze.c

   1 /*
   2  * filter_freeze.c -- simple frame freezing filter
   3  * Copyright (C) 2007 Jean-Baptiste Mardelle <jb@kdenlive.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <framework/mlt_filter.h>
  21 #include <framework/mlt_frame.h>
  22 #include <framework/mlt_producer.h>
  23 #include <framework/mlt_service.h>
  24 #include <framework/mlt_factory.h>
  25 #include <framework/mlt_property.h>
  26
  27 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  28 {
  29         // Get the image
  30         mlt_filter filter = mlt_frame_pop_service( this );
  31         mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
  32
  33         mlt_frame freeze_frame = NULL;;
  34         int freeze_before = mlt_properties_get_int( properties, "freeze_before" );
  35         int freeze_after = mlt_properties_get_int( properties, "freeze_after" );
  36         mlt_position pos = mlt_properties_get_position( properties, "frame" );
  37         mlt_position currentpos = mlt_properties_get_position( properties, "_seek_frame" );
  38
  39         int do_freeze = 0;
  40         if (freeze_before == 0 && freeze_after == 0) {
  41                 do_freeze = 1;
  42         } else if (freeze_before != 0 && pos > currentpos) {
  43                 do_freeze = 1;
  44         } else if (freeze_after != 0 && pos < currentpos) {
  45                 do_freeze = 1;
  46         }
  47
  48         if (do_freeze == 1) {
  49                 freeze_frame = mlt_properties_get_data( properties, "freeze_frame", NULL );
  50
  51                 if( freeze_frame == NULL || mlt_properties_get_position( properties, "_frame" ) != pos )
  52                 {
  53                         // freeze_frame has not been fetched yet, so fetch it and cache it.
  54                         mlt_producer producer = mlt_frame_get_original_producer(this);
  55                         mlt_producer_seek( producer, pos );
  56
  57                         // Get the frame
  58                         mlt_service_get_frame( mlt_producer_service(producer), &freeze_frame, 0 );
  59
  60                         mlt_properties props = MLT_FRAME_PROPERTIES( this );
  61                         mlt_properties freeze_properties = MLT_FRAME_PROPERTIES( freeze_frame );
  62                         mlt_properties_set_double( freeze_properties, "consumer_aspect_ratio", mlt_properties_get_double( props, "consumer_aspect_ratio" ) );
  63                         mlt_properties_set( freeze_properties, "rescale.interp", mlt_properties_get( props, "rescale.interp" ) );
  64                         mlt_properties_set_double( freeze_properties, "aspect_ratio", mlt_frame_get_aspect_ratio( this ) );
  65                         mlt_properties_set_int( freeze_properties, "progressive", mlt_properties_get_int( props, "progressive" ) );
  66
  67                         mlt_properties_set_data( properties, "freeze_frame", freeze_frame, 0, NULL, NULL );
  68                         mlt_properties_set_position( properties, "_frame", pos );
  69                 }
  70                 int error = mlt_frame_get_image( freeze_frame, image, format, width, height, 1 );
  71                 return error;
  72         }
  73
  74         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  75         return error;
  76 }
  77
  78 /** Filter processing.
  79 */
  80
  81 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  82 {
  83
  84         // Push the filter on to the stack
  85         mlt_frame_push_service( frame, this );
  86
  87         // Determine the time position of this frame
  88         mlt_properties_set_position( MLT_FILTER_PROPERTIES( this ), "_seek_frame", mlt_frame_get_position( frame ) -  mlt_filter_get_in( this ) );
  89
  90         // Push the frame filter
  91         mlt_frame_push_get_image( frame, filter_get_image );
  92
  93         return frame;
  94 }
  95
  96 /** Constructor for the filter.
  97 */
  98
  99 mlt_filter filter_freeze_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 100 {
 101         mlt_filter this = mlt_filter_new( );
 102         if ( this != NULL )
 103         {
 104                 this->process = filter_process;
 105                 // Set the frame which will be chosen for freeze
 106                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "frame", "0" );
 107
 108                 // If freeze_after = 1, only frames after the "frame" value will be frozen
 109                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "freeze_after", "0" );
 110
 111                 // If freeze_before = 1, only frames after the "frame" value will be frozen
 112                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "freeze_before", "0" );
 113         }
 114         return this;
 115 }
 116
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 118