/** Mix consecutive clips for a specified length and apply transition if specified.
*
+ * This version of the mix function does not utilize any frames beyond the out of
+ * clip A or before the in point of clip B. It takes the frames needed for the length
+ * of the transition by adjusting the duration of both clips - the out point for clip A
+ * and the in point for clip B.
* \public \memberof mlt_playlist_s
* \param self a playlist
* \param clip the index of the playlist entry
return error;
}
+/** Mix consecutive clips for a specified length.
+ *
+ * This version of the mix function maintains the out point of the clip A by occupying the
+ * beginning of clip B before its current in point. Therefore, it ends up adjusting the in
+ * point and duration of clip B without affecting the duration of clip A.
+ * Also, therefore, there must be enough frames after the out point of clip A.
+ * \public \memberof mlt_playlist_s
+ * \param self a playlist
+ * \param clip the index of the playlist entry
+ * \param length the number of frames over which to create the mix
+ * \return true if there was an error
+ */
+
+int mlt_playlist_mix_in( mlt_playlist self, int clip, int length )
+{
+ int error = ( clip < 0 || clip + 1 >= self->count );
+ if ( error == 0 )
+ {
+ playlist_entry *clip_a = self->list[ clip ];
+ playlist_entry *clip_b = self->list[ clip + 1 ];
+ mlt_producer track_a = NULL;
+ mlt_producer track_b = NULL;
+ mlt_tractor tractor = mlt_tractor_new( );
+
+ mlt_service_set_profile( MLT_TRACTOR_SERVICE( tractor ),
+ mlt_service_profile( MLT_PLAYLIST_SERVICE( self ) ) );
+ mlt_properties_set_lcnumeric( MLT_TRACTOR_PROPERTIES( tractor ),
+ mlt_properties_get_lcnumeric( MLT_PLAYLIST_PROPERTIES( self ) ) );
+ mlt_events_block( MLT_PLAYLIST_PROPERTIES( self ), self );
+
+ // Check length is valid for both clips and resize if necessary.
+ int max_size = ( clip_a->frame_out + 1 ) > clip_b->frame_count ? ( clip_a->frame_out + 1 ) : clip_b->frame_count;
+ length = length > max_size ? max_size : length;
+
+ // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
+ if ( length != clip_a->frame_out + 1 )
+ track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out + 1, clip_a->frame_out + length );
+ else
+ track_a = clip_a->producer;
+
+ if ( length != clip_b->frame_count )
+ track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
+ else
+ track_b = clip_b->producer;
+
+ // Set the tracks on the tractor
+ mlt_tractor_set_track( tractor, track_a, 0 );
+ mlt_tractor_set_track( tractor, track_b, 1 );
+
+ // Insert the mix object into the playlist
+ mlt_playlist_insert( self, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
+
+ // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
+ if ( track_a != clip_a->producer )
+ mlt_producer_close( track_a );
+ if ( track_b != clip_b->producer )
+ mlt_producer_close( track_b );
+
+ // Check if we have anything left on the right hand clip
+ if ( track_b == clip_b->producer )
+ {
+ clip_b->preservation_hack = 1;
+ mlt_playlist_remove( self, clip + 2 );
+ }
+ else if ( clip_b->frame_out - clip_b->frame_in >= length )
+ {
+ mlt_playlist_resize_clip( self, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
+ mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
+ }
+ else
+ {
+ mlt_producer_clear( clip_b->producer );
+ mlt_playlist_remove( self, clip + 2 );
+ }
+
+ // Check if we have anything left on the left hand clip
+ if ( track_a == clip_a->producer )
+ {
+ clip_a->preservation_hack = 1;
+ mlt_playlist_remove( self, clip );
+ }
+ else if ( clip_a->frame_out - clip_a->frame_in > 0 )
+ {
+ mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
+ }
+ else
+ {
+ mlt_producer_clear( clip_a->producer );
+ mlt_playlist_remove( self, clip );
+ }
+
+ // Unblock and force a fire off of change events to listeners
+ mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( self ), self );
+ mlt_playlist_virtual_refresh( self );
+ mlt_tractor_close( tractor );
+ }
+ return error;
+}
+
+/** Mix consecutive clips for a specified length.
+ *
+ * This version of the mix function maintains the in point of the B clip by occupying the
+ * end of clip A before its current out point. Therefore, it ends up adjusting the out
+ * point and duration of clip A without affecting the duration or starting frame of clip B.
+ * Also, therefore, there must be enough frames before the in point of clip B.
+ * \public \memberof mlt_playlist_s
+ * \param self a playlist
+ * \param clip the index of the playlist entry
+ * \param length the number of frames over which to create the mix
+ * \return true if there was an error
+ */
+
+int mlt_playlist_mix_out( mlt_playlist self, int clip, int length )
+{
+ int error = ( clip < 0 || clip + 1 >= self->count );
+ if ( error == 0 )
+ {
+ playlist_entry *clip_a = self->list[ clip ];
+ playlist_entry *clip_b = self->list[ clip + 1 ];
+ mlt_producer track_a = NULL;
+ mlt_producer track_b = NULL;
+ mlt_tractor tractor = mlt_tractor_new( );
+
+ mlt_service_set_profile( MLT_TRACTOR_SERVICE( tractor ),
+ mlt_service_profile( MLT_PLAYLIST_SERVICE( self ) ) );
+ mlt_properties_set_lcnumeric( MLT_TRACTOR_PROPERTIES( tractor ),
+ mlt_properties_get_lcnumeric( MLT_PLAYLIST_PROPERTIES( self ) ) );
+ mlt_events_block( MLT_PLAYLIST_PROPERTIES( self ), self );
+
+ // Check length is valid for both clips and resize if necessary.
+ int max_size = clip_a->frame_count > clip_b->frame_in ? clip_a->frame_count : clip_b->frame_in;
+ length = length > max_size ? max_size : length;
+
+ // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
+ if ( length != clip_a->frame_count )
+ track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
+ else
+ track_a = clip_a->producer;
+
+ if ( length != clip_b->frame_in )
+ track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in - length + 1, clip_b->frame_in );
+ else
+ track_b = clip_b->producer;
+
+ // Set the tracks on the tractor
+ mlt_tractor_set_track( tractor, track_a, 0 );
+ mlt_tractor_set_track( tractor, track_b, 1 );
+
+ // Insert the mix object into the playlist
+ mlt_playlist_insert( self, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
+
+ // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
+ if ( track_a != clip_a->producer )
+ mlt_producer_close( track_a );
+ if ( track_b != clip_b->producer )
+ mlt_producer_close( track_b );
+
+ // Check if we have anything left on the right hand clip
+ if ( track_b == clip_b->producer )
+ {
+ clip_b->preservation_hack = 1;
+ mlt_playlist_remove( self, clip + 2 );
+ }
+ else if ( clip_b->frame_out - clip_b->frame_in > 0 )
+ {
+ mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
+ }
+ else
+ {
+ mlt_producer_clear( clip_b->producer );
+ mlt_playlist_remove( self, clip + 2 );
+ }
+
+ // Check if we have anything left on the left hand clip
+ if ( track_a == clip_a->producer )
+ {
+ clip_a->preservation_hack = 1;
+ mlt_playlist_remove( self, clip );
+ }
+ else if ( clip_a->frame_out - clip_a->frame_in >= length )
+ {
+ mlt_playlist_resize_clip( self, clip, clip_a->frame_in, clip_a->frame_out - length );
+ mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
+ mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
+ }
+ else
+ {
+ mlt_producer_clear( clip_a->producer );
+ mlt_playlist_remove( self, clip );
+ }
+
+ // Unblock and force a fire off of change events to listeners
+ mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( self ), self );
+ mlt_playlist_virtual_refresh( self );
+ mlt_tractor_close( tractor );
+ }
+ return error;
+}
+
/** Add a transition to an existing mix.
*
* \public \memberof mlt_playlist_s
projects / mlt / blobdiff