research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/filter_transition.c

   1 /*
   2  * filter_transition.c -- Convert any transition into a filter
   3  * Copyright (C) 2005 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_transition.h"
  22 #include <framework/mlt_factory.h>
  23 #include <framework/mlt_frame.h>
  24 #include <framework/mlt_transition.h>
  25
  26 /** Get the image via the transition.
  27         NB: Not all transitions will accept a and b frames being the same...
  28 */
  29
  30 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  31 {
  32         mlt_transition transition = mlt_frame_pop_service( this );
  33         if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "image_count" ) >= 1 )
  34                 mlt_transition_process( transition, this, this );
  35         return mlt_frame_get_image( this, image, format, width, height, writable );
  36 }
  37
  38 /** Get the audio via the transition.
  39         NB: Not all transitions will accept a and b frames being the same...
  40 */
  41
  42 static int filter_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
  43 {
  44         // Obtain the transition instance
  45         mlt_transition transition = mlt_frame_pop_audio( this );
  46         mlt_transition_process( transition, this, this );
  47         return mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
  48 }
  49
  50 /** Filter processing.
  51 */
  52
  53 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  54 {
  55         // Obtain the transition instance
  56         mlt_transition transition = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
  57
  58         // If we haven't created the instance, do it now
  59         if ( transition == NULL )
  60         {
  61                 char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "transition" );
  62                 transition = mlt_factory_transition( name, NULL );
  63                 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
  64         }
  65
  66         // We may still not have a transition...
  67         if ( transition != NULL )
  68         {
  69                 // Get the transition type
  70                 int type = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type" );
  71
  72                 // Set the basic info
  73                 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "in" ) );
  74                 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "out" ) );
  75
  76                 // Refresh with current user values
  77                 mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), MLT_FILTER_PROPERTIES( this ), "transition." );
  78
  79                 if ( type & 1 && !mlt_frame_is_test_card( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 1 ) )
  80                 {
  81                         mlt_frame_push_service( frame, transition );
  82                         mlt_frame_push_get_image( frame, filter_get_image );
  83                 }
  84                 if ( type & 2 && !mlt_frame_is_test_audio( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 2 ) )
  85                 {
  86                         mlt_frame_push_audio( frame, transition );
  87                         mlt_frame_push_audio( frame, filter_get_audio );
  88                 }
  89
  90                 if ( type == 0 )
  91                         mlt_properties_debug( MLT_TRANSITION_PROPERTIES( transition ), "unknown transition type", stderr );
  92         }
  93         else
  94         {
  95                 mlt_properties_debug( MLT_FILTER_PROPERTIES( this ), "no transition", stderr );
  96         }
  97
  98         return frame;
  99 }
 100
 101 /** Constructor for the filter.
 102 */
 103
 104 mlt_filter filter_transition_init( char *arg )
 105 {
 106         mlt_filter this = mlt_filter_new( );
 107         if ( this != NULL )
 108         {
 109                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition", arg );
 110                 this->process = filter_process;
 111         }
 112         return this;
 113 }
 114