#include "config.h"
#include "mlt_playlist.h"
+#include "mlt_frame.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/** Virtual playlist entry.
+*/
+
+typedef struct
+{
+ mlt_producer producer;
+ mlt_timecode in;
+ mlt_timecode playtime;
+}
+playlist_entry;
/** Private definition.
*/
struct mlt_playlist_s
{
struct mlt_producer_s parent;
+ struct mlt_producer_s blank;
+
+ int size;
int count;
- int track;
+ playlist_entry **list;
};
-/** Constructor.
+/** Forward declarations
+*/
- TODO: Override and implement all transport related method.
- TODO: Override and implement a time code normalising service get_frame
+static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
+
+/** Constructor.
*/
mlt_playlist mlt_playlist_init( )
if ( this != NULL )
{
mlt_producer producer = &this->parent;
- if ( mlt_producer_init( producer, this ) != 0 )
- {
- free( this );
- this = NULL;
- }
+
+ // Construct the producer
+ mlt_producer_init( producer, this );
+
+ // Override the producer get_frame
+ producer->get_frame = producer_get_frame;
+
+ // Initialise blank
+ mlt_producer_init( &this->blank, NULL );
}
return this;
return mlt_producer_service( &this->parent );
}
-/** Append a producer to the playlist.
+/** Get the propertues associated to this playlist.
+*/
- TODO: Implement
- TODO: Extract length information from the producer.
+mlt_properties mlt_playlist_properties( mlt_playlist this )
+{
+ return mlt_producer_properties( &this->parent );
+}
+
+/** Append to the virtual playlist.
*/
-int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
+static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer producer, mlt_timecode in, mlt_timecode out )
{
+ // Get the fps of the first producer
+ double fps = mlt_properties_get_double( mlt_playlist_properties( this ), "first_fps" );
+
+ // If fps is 0
+ if ( fps == 0 )
+ {
+ // Inherit it from the producer
+ fps = mlt_producer_get_fps( producer );
+ }
+ else if ( fps != mlt_properties_get_double( mlt_producer_properties( producer ), "fps" ) )
+ {
+ // Generate a warning for now - the following attempt to fix may fail
+ fprintf( stderr, "Warning: fps mismatch on playlist producer %d\n", this->count );
+
+ // It should be safe to impose fps on an image producer, but not necessarily safe for video
+ mlt_properties_set_double( mlt_producer_properties( producer ), "fps", fps );
+ }
+
+ // Check that we have room
+ if ( this->count >= this->size )
+ {
+ int i;
+ this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
+ for ( i = this->size; i < this->size + 10; i ++ )
+ this->list[ i ] = NULL;
+ this->size += 10;
+ }
+
+ this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
+ this->list[ this->count ]->producer = producer;
+ this->list[ this->count ]->in = in;
+ this->list[ this->count ]->playtime = out - in;
+
+ this->count ++;
+
+ mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", fps );
+ mlt_properties_set_double( mlt_playlist_properties( this ), "fps", fps );
+
return 0;
}
-/** Append a blank to the playlist of a given length.
+/** Seek in the virtual playlist.
+*/
+
+static mlt_producer mlt_playlist_virtual_seek( mlt_playlist this )
+{
+ // Default producer to blank
+ mlt_producer producer = &this->blank;
+
+ // Map playlist position to real producer in virtual playlist
+ mlt_timecode position = mlt_producer_position( &this->parent );
+
+ // Loop through the virtual playlist
+ int i = 0;
+
+ for ( i = 0; i < this->count; i ++ )
+ {
+ if ( position < this->list[ i ]->playtime )
+ {
+ // Found it, now break
+ producer = this->list[ i ]->producer;
+ position += this->list[ i ]->in;
+ break;
+ }
+ else
+ {
+ // Decrement position by length of this entry
+ position -= this->list[ i ]->playtime;
+ }
+ }
+
+ // Seek in real producer to relative position
+ mlt_producer_seek( producer, position );
+
+ return producer;
+}
+
+/** Append a producer to the playlist.
+*/
- TODO: Implement
+int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
+{
+ // Append to virtual list
+ return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) );
+}
+
+/** Append a blank to the playlist of a given length.
*/
int mlt_playlist_blank( mlt_playlist this, mlt_timecode length )
{
+ // Append to the virtual list
+ return mlt_playlist_virtual_append( this, &this->blank, 0, length );
+}
+
+/** Get the current frame.
+*/
+
+static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
+{
+ // Get this mlt_playlist
+ mlt_playlist this = producer->child;
+
+ // Get the real producer
+ mlt_producer real = mlt_playlist_virtual_seek( this );
+
+ // Get the frame
+ mlt_service_get_frame( mlt_producer_service( real ), frame, index );
+
+ // Update timecode on the frame we're creating
+ mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
+
+ // Position ourselves on the next frame
+ mlt_producer_prepare_next( producer );
+
return 0;
}
/** Close the playlist.
*/
-mlt_playlist_close( mlt_playlist this )
+void mlt_playlist_close( mlt_playlist this )
{
mlt_producer_close( &this->parent );
+ mlt_producer_close( &this->blank );
free( this );
}
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