src/modules/core/filter_transition.c

src/modules/core/filter_transition.h
+ Initial release

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@743 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/modules/core/filter_transition.c b/src/modules/core/filter_transition.c
new file mode 100644 (file)
index 0000000..61c38be
--- /dev/null
+++ b/src/modules/core/filter_transition.c
@@ -0,0 +1,113 @@
+/*
+ * filter_transition.c -- Convert any transition into a filter
+ * Copyright (C) 2005 Ushodaya Enterprises Limited
+ * Author: Charles Yates <charles.yates@pandora.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "filter_transition.h"
+#include <framework/mlt_factory.h>
+#include <framework/mlt_frame.h>
+#include <framework/mlt_transition.h>
+
+/** Get the image via the transition.
+       NB: Not all transitions will accept a and b frames being the same...
+*/
+
+static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+{
+       mlt_transition transition = mlt_frame_pop_service( this );
+       mlt_transition_process( transition, this, this );
+       return mlt_frame_get_image( this, image, format, width, height, writable );
+}
+
+/** Get the audio via the transition.
+       NB: Not all transitions will accept a and b frames being the same...
+*/
+
+static int filter_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
+{
+       // Obtain the transition instance
+       mlt_transition transition = mlt_frame_pop_audio( this );
+       mlt_transition_process( transition, this, this );
+       return mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
+}
+
+/** Filter processing.
+*/
+
+static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
+{
+       // Obtain the transition instance
+       mlt_transition transition = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
+
+       // If we haven't created the instance, do it now
+       if ( transition == NULL )
+       {
+               char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "transition" );
+               transition = mlt_factory_transition( name, NULL );
+               mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
+       }
+
+       // We may still not have a transition...
+       if ( transition != NULL )
+       {
+               // Get the transition type
+               int type = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type" );
+
+               // Set the basic info
+               mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "in" ) );
+               mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "out" ) );
+
+               // Refresh with current user values
+               mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), MLT_FILTER_PROPERTIES( this ), "transition." );
+
+               if ( type & 1 )
+               {
+                       mlt_frame_push_service( frame, transition );
+                       mlt_frame_push_get_image( frame, filter_get_image );
+               }
+               if ( type & 2 )
+               {
+                       mlt_frame_push_audio( frame, transition );
+                       mlt_frame_push_audio( frame, filter_get_audio );
+               }
+
+               if ( type == 0 )
+                       mlt_properties_debug( MLT_TRANSITION_PROPERTIES( transition ), "unknown transition type", stderr );
+       }
+       else
+       {
+               mlt_properties_debug( MLT_FILTER_PROPERTIES( this ), "no transition", stderr );
+       }
+
+       return frame;
+}
+
+/** Constructor for the filter.
+*/
+
+mlt_filter filter_transition_init( char *arg )
+{
+       mlt_filter this = mlt_filter_new( );
+       if ( this != NULL )
+       {
+               mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition", arg );
+               this->process = filter_process;
+       }
+       return this;
+}
+

diff --git a/src/modules/core/filter_transition.h b/src/modules/core/filter_transition.h
new file mode 100644 (file)
index 0000000..f6dc6f6
--- /dev/null
+++ b/src/modules/core/filter_transition.h
@@ -0,0 +1,28 @@
+/*
+ * filter_transition.h -- Convert any transition into a filter
+ * Copyright (C) 2005 Ushodaya Enterprises Limited
+ * Author: Charles Yates <charles.yates@pandora.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _FILTER_TRANSITION_H_
+#define _FILTER_TRANSITION_H_
+
+#include <framework/mlt_filter.h>
+
+extern mlt_filter filter_transition_init( char *arg );
+
+#endif