#include "config.h"
#include "mlt_multitrack.h"
+#include "mlt_playlist.h"
#include "mlt_frame.h"
#include <stdio.h>
mlt_producer producer = &this->parent;
if ( mlt_producer_init( producer, this ) == 0 )
{
+ mlt_properties properties = mlt_multitrack_properties( this );
producer->get_frame = producer_get_frame;
+ mlt_properties_set_data( properties, "multitrack", this, 0, NULL, NULL );
+ mlt_properties_set( properties, "log_id", "multitrack" );
}
else
{
/** Initialise timecode related information.
*/
-static void mlt_multitrack_refresh( mlt_multitrack this )
+void mlt_multitrack_refresh( mlt_multitrack this )
{
int i = 0;
if ( producer != NULL )
{
// Determine the longest length
- length = mlt_producer_get_length( producer ) > length ? mlt_producer_get_length( producer ) : length;
+ length = mlt_producer_get_playtime( producer ) > length ? mlt_producer_get_playtime( producer ) : length;
// Handle fps
if ( fps == 0 )
// Update multitrack properties now - we'll not destroy the in point here
mlt_properties_set_timecode( properties, "length", length );
mlt_properties_set_timecode( properties, "out", length );
- mlt_properties_set_timecode( properties, "playtime", length - mlt_properties_get_timecode( properties, "in" ) );
+ mlt_properties_set_double( properties, "fps", fps );
}
/** Connect a producer to a given track.
+
+ Note that any producer can be connected here, but see special case treatment
+ of playlist in clip point determination below.
*/
int mlt_multitrack_connect( mlt_multitrack this, mlt_producer producer, int track )
return result;
}
+/** Determine the clip point.
+
+ Special case here: a 'producer' has no concept of multiple clips - only the
+ playlist and multitrack producers have clip functionality. Further to that a
+ multitrack determines clip information from any connected tracks that happen
+ to be playlists.
+
+ Additionally, it must locate clips in the correct order, for example, consider
+ the following track arrangement:
+
+ playlist1 |0.0 |b0.0 |0.1 |0.1 |0.2 |
+ playlist2 |b1.0 |1.0 |b1.1 |1.1 |
+
+ Note - b clips represent blanks. They are also reported as clip positions.
+
+ When extracting clip positions from these playlists, we should get a sequence of:
+
+ 0.0, 1.0, b0.0, 0.1, b1.1, 1.1, 0.1, 0.2, [out of playlist2], [out of playlist1]
+*/
+
+mlt_timecode mlt_multitrack_clip( mlt_multitrack this, mlt_whence whence, int index )
+{
+ int first = 1;
+ mlt_timecode position = 0;
+ int i = 0;
+
+ // Loop through each of the tracks
+ for ( i = 0; i < this->count; i ++ )
+ {
+ // Get the producer for this track
+ mlt_producer producer = this->list[ i ];
+
+ // If it's assigned...
+ if ( producer != NULL )
+ {
+ // Get the properties of this producer
+ mlt_properties properties = mlt_producer_properties( producer );
+
+ // Determine if it's a playlist
+ mlt_playlist playlist = mlt_properties_get_data( properties, "playlist", NULL );
+
+ // We only consider playlists
+ if ( playlist != NULL )
+ {
+ // Locate the smallest timecode
+ if ( first )
+ {
+ // First position found
+ position = mlt_playlist_clip( playlist, whence, index );
+
+ // We're no longer first
+ first = 0;
+ }
+ else
+ {
+ // Obtain the clip position in this playlist
+ mlt_timecode position2 = mlt_playlist_clip( playlist, whence, index );
+
+ // If this position is prior to the first, then use it
+ if ( position2 < position )
+ position = position2;
+ }
+ }
+ }
+ }
+
+ return position;
+}
+
/** Get frame method.
Special case here: The multitrack must be used in a conjunction with a downstream
// Get the frame from the producer
mlt_service_get_frame( mlt_producer_service( producer ), frame, 0 );
+
+ // Indicate speed of this producer
+ mlt_properties producer_properties = mlt_producer_properties( parent );
+ double speed = mlt_properties_get_double( producer_properties, "speed" );
+ mlt_properties properties = mlt_frame_properties( *frame );
+ mlt_properties_set_double( properties, "speed", speed );
}
else
{
// Generate a test frame
*frame = mlt_frame_init( );
- // Let tractor know if we've reached the end
- mlt_properties_set_int( mlt_frame_properties( *frame ), "last_track", index >= this->count );
-
// Update timecode on the frame we're creating
mlt_frame_set_timecode( *frame, mlt_producer_position( parent ) );
// Move on to the next frame
if ( index >= this->count )
+ {
+ // Let tractor know if we've reached the end
+ mlt_properties_set_int( mlt_frame_properties( *frame ), "last_track", 1 );
+
+ // Move to the next frame
mlt_producer_prepare_next( parent );
- }
+ }
- fprintf( stderr, "timestamp for %d = %f\n", index, ( float )mlt_frame_get_timecode( *frame ) );
+ // Refresh our stats
+ mlt_multitrack_refresh( this );
+ }
return 0;
}
projects / melted / blobdiff