mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
{
mlt_frame_push_service( a_frame, transition );
mlt_frame_push_frame( a_frame, b_frame );
mlt_frame_push_get_image( a_frame, transition_get_image );
return a_frame;
}
static mlt_frame process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
{
mlt_service service = MLT_TRANSITION_SERVICE(transition);
if ( !GlslManager::init_chain( service ) ) {
// Create the Movit effect chain
EffectChain* chain = GlslManager::get_chain( service );
mlt_profile profile = mlt_service_profile( service );
Input* b_input = new MltInput( profile->width, profile->height );
ImageFormat output_format;
output_format.color_space = COLORSPACE_sRGB;
output_format.gamma_curve = GAMMA_sRGB;
chain->add_input( b_input );
chain->add_output( output_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED );
chain->set_dither_bits( 8 );
Effect* effect = chain->add_effect( new OverlayEffect(),
GlslManager::get_input( service ), b_input );
// Save these new input on properties for get_image
mlt_properties_set_data( MLT_TRANSITION_PROPERTIES(transition),
"movit input B", b_input, 0, NULL, NULL );
}
// Push the transition on to the frame
mlt_frame_push_service( a_frame, transition );
// Push the b_frame on to the stack
mlt_frame_push_frame( a_frame, b_frame );
// Push the transition method
mlt_frame_push_get_image( a_frame, get_image );
return a_frame;
}
mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
{
char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( transition ), "_unique_id" );
mlt_properties_set_position( MLT_FRAME_PROPERTIES( a_frame ), name, mlt_frame_get_position( a_frame ) );
mlt_frame_push_service( a_frame, transition );
mlt_frame_push_frame( a_frame, b_frame );
mlt_frame_push_get_image( a_frame, transition_get_image );
return a_frame;
}
static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
{
// Push the transition on to the frame
mlt_frame_push_service( a_frame, transition );
// Push the b_frame on to the stack
mlt_frame_push_frame( a_frame, b_frame );
// Push the transition method
mlt_frame_push_get_image( a_frame, transition_get_image );
return a_frame;
}
static mlt_frame transitionProcess(mlt_transition transition, mlt_frame aFrame, mlt_frame bFrame) {
mlt_frame_push_service(aFrame, transition);
mlt_frame_push_frame(aFrame, bFrame);
mlt_frame_push_get_image(aFrame, transitionGetImage);
return aFrame;
}
static int transition_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
{
int error = 0;
mlt_transition self = service->child;
mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
int accepts_blanks = mlt_properties_get_int( properties, "accepts_blanks" );
int a_track = mlt_properties_get_int( properties, "a_track" );
int b_track = mlt_properties_get_int( properties, "b_track" );
mlt_position in = mlt_properties_get_position( properties, "in" );
mlt_position out = mlt_properties_get_position( properties, "out" );
int always_active = mlt_properties_get_int( properties, "always_active" );
int type = mlt_properties_get_int( properties, "_transition_type" );
int reverse_order = 0;
// Ensure that we have the correct order
if ( a_track > b_track )
{
reverse_order = 1;
a_track = b_track;
b_track = mlt_properties_get_int( properties, "a_track" );
}
// Only act on this operation once per multitrack iteration from the tractor
if ( !self->held )
{
int active = 0;
int i = 0;
int a_frame = a_track;
int b_frame = b_track;
mlt_position position;
int ( *invalid )( mlt_frame ) = type == 1 ? mlt_frame_is_test_card : mlt_frame_is_test_audio;
// Initialise temporary store
if ( self->frames == NULL )
self->frames = calloc( b_track + 1, sizeof( mlt_frame ) );
// Get all frames between a and b
for( i = a_track; i <= b_track; i ++ )
mlt_service_get_frame( self->producer, &self->frames[ i ], i );
// We're holding these frames until the last_track frame property is received
self->held = 1;
// When we need to locate the a_frame
switch( type )
{
case 1:
case 2:
// Some transitions (esp. audio) may accept blank frames
active = accepts_blanks;
// If we're not active then...
if ( !active )
{
// Hunt for the a_frame
while( a_frame <= b_frame && invalid( self->frames[ a_frame ] ) )
a_frame ++;
// Determine if we're active now
active = a_frame != b_frame && !invalid( self->frames[ b_frame ] );
}
break;
default:
mlt_log( service, MLT_LOG_ERROR, "invalid transition type\n" );
break;
}
// Now handle the non-always active case
if ( active && !always_active && a_frame <= b_track )
{
// For non-always-active transitions, we need the current position of the a frame
position = mlt_frame_get_position( self->frames[ a_frame ] );
// If a is in range, we're active
active = position >= in && ( out == 0 || position <= out );
}
// Finally, process the a and b frames
if ( active && !mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( self ), "disable" ) )
{
int frame_nb = ( !reverse_order && a_frame <= b_track )? a_frame : b_frame;
mlt_frame a_frame_ptr = self->frames[ frame_nb ];
frame_nb = ( !reverse_order || a_frame > b_track )? b_frame : a_frame;
mlt_frame b_frame_ptr = self->frames[ frame_nb ];
int a_hide = mlt_properties_get_int( MLT_FRAME_PROPERTIES( a_frame_ptr ), "hide" );
int b_hide = mlt_properties_get_int( MLT_FRAME_PROPERTIES( b_frame_ptr ), "hide" );
if ( !( a_hide & type ) && !( b_hide & type ) )
{
// Add hooks for pre-processing frames
mlt_frame_push_service( a_frame_ptr, self );
mlt_frame_push_get_image( a_frame_ptr, get_image_a );
mlt_frame_push_frame( b_frame_ptr, a_frame_ptr );
mlt_frame_push_service( b_frame_ptr, self );
mlt_frame_push_get_image( b_frame_ptr, get_image_b );
// Process the transition
*frame = mlt_transition_process( self, a_frame_ptr, b_frame_ptr );
// We need to ensure that the tractor doesn't consider this frame for output
if ( *frame == a_frame_ptr )
b_hide |= type;
else
a_hide |= type;
mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame_ptr ), "hide", a_hide );
mlt_properties_set_int( MLT_FRAME_PROPERTIES( b_frame_ptr ), "hide", b_hide );
}
}
}
// Obtain the frame from the cache or the producer we're attached to
if ( index >= a_track && index <= b_track )
*frame = self->frames[ index ];
else
error = mlt_service_get_frame( self->producer, frame, index );
// Determine if that was the last track
self->held = !mlt_properties_get_int( MLT_FRAME_PROPERTIES( *frame ), "last_track" );
return error;
}
