* Copyright (C) 2003-2004 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 library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This library 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser 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.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "mlt_service.h"
+#include "mlt_filter.h"
#include "mlt_frame.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <pthread.h>
/** IMPORTANT NOTES
int count;
mlt_service *in;
mlt_service out;
+ int filter_count;
+ int filter_size;
+ mlt_filter *filters;
+ pthread_mutex_t mutex;
}
mlt_service_base;
-/** Friends?
+/** Private methods
*/
static void mlt_service_disconnect( mlt_service this );
static void mlt_service_connect( mlt_service this, mlt_service that );
static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index );
+static void mlt_service_property_changed( mlt_listener, mlt_properties owner, mlt_service this, void **args );
/** Constructor
*/
int mlt_service_init( mlt_service this, void *child )
{
+ int error = 0;
+
// Initialise everything to NULL
memset( this, 0, sizeof( struct mlt_service_s ) );
// Assign the child
this->child = child;
- // Generate private space
- this->private = calloc( sizeof( mlt_service_base ), 1 );
+ // Generate local space
+ this->local = calloc( sizeof( mlt_service_base ), 1 );
// Associate the methods
this->get_frame = service_get_frame;
// Initialise the properties
- return mlt_properties_init( &this->parent, this );
+ error = mlt_properties_init( &this->parent, this );
+ if ( error == 0 )
+ {
+ this->parent.close = ( mlt_destructor )mlt_service_close;
+ this->parent.close_object = this;
+
+ mlt_events_init( &this->parent );
+ mlt_events_register( &this->parent, "service-changed", NULL );
+ mlt_events_register( &this->parent, "property-changed", ( mlt_transmitter )mlt_service_property_changed );
+ pthread_mutex_init( &( ( mlt_service_base * )this->local )->mutex, NULL );
+ }
+
+ return error;
}
-/** Return the properties object.
-*/
+static void mlt_service_property_changed( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
+{
+ if ( listener != NULL )
+ listener( owner, this, ( char * )args[ 0 ] );
+}
+
+void mlt_service_lock( mlt_service this )
+{
+ if ( this != NULL )
+ pthread_mutex_lock( &( ( mlt_service_base * )this->local )->mutex );
+}
+
+void mlt_service_unlock( mlt_service this )
+{
+ if ( this != NULL )
+ pthread_mutex_unlock( &( ( mlt_service_base * )this->local )->mutex );
+}
-mlt_properties mlt_service_properties( mlt_service this )
+mlt_service_type mlt_service_identify( mlt_service this )
{
- return &this->parent;
+ mlt_service_type type = invalid_type;
+ if ( this != NULL )
+ {
+ mlt_properties properties = MLT_SERVICE_PROPERTIES( this );
+ char *mlt_type = mlt_properties_get( properties, "mlt_type" );
+ char *resource = mlt_properties_get( properties, "resource" );
+ if ( mlt_type == NULL )
+ type = unknown_type;
+ else if ( resource == NULL || !strcmp( resource, "<producer>" ) )
+ type = producer_type;
+ else if ( !strcmp( resource, "<playlist>" ) )
+ type = playlist_type;
+ else if ( !strcmp( resource, "<tractor>" ) )
+ type = tractor_type;
+ else if ( !strcmp( resource, "<multitrack>" ) )
+ type = multitrack_type;
+ else if ( !strcmp( mlt_type, "producer" ) )
+ type = producer_type;
+ else if ( !strcmp( mlt_type, "filter" ) )
+ type = filter_type;
+ else if ( !strcmp( mlt_type, "transition" ) )
+ type = transition_type;
+ else if ( !strcmp( mlt_type, "consumer" ) )
+ type = consumer_type;
+ else
+ type = unknown_type;
+ }
+ return type;
}
/** Connect a producer service.
int i = 0;
// Get the service base
- mlt_service_base *base = this->private;
+ mlt_service_base *base = this->local;
- // Does this service accept input?
- if ( mlt_service_accepts_input( this ) == 0 )
- return 1;
-
- // Does the producer service accept output connections?
- if ( mlt_service_accepts_output( producer ) == 0 )
- return 2;
+ // Special case 'track' index - only works for last filter(s) in a particular chain
+ // but allows a filter to apply to the output frame regardless of which track it comes from
+ if ( index == -1 )
+ index = 0;
// Check if the producer is already registered with this service
for ( i = 0; i < base->count; i ++ )
// If we have space, assign the input
if ( base->in != NULL && index >= 0 && index < base->size )
{
+ // Get the current service
+ mlt_service current = base->in[ index ];
+
+ // Increment the reference count on this producer
+ if ( producer != NULL )
+ {
+ mlt_service_lock( producer );
+ mlt_properties_inc_ref( MLT_SERVICE_PROPERTIES( producer ) );
+ mlt_service_unlock( producer );
+ }
+
// Now we disconnect the producer service from its consumer
mlt_service_disconnect( producer );
// Now we connect the producer to its connected consumer
mlt_service_connect( producer, this );
+ // Close the current service
+ mlt_service_close( current );
+
// Inform caller that all went well
return 0;
}
/** Disconnect this service from its consumer.
*/
-void mlt_service_disconnect( mlt_service this )
+static void mlt_service_disconnect( mlt_service this )
+{
+ if ( this != NULL )
+ {
+ // Get the service base
+ mlt_service_base *base = this->local;
+
+ // Disconnect
+ base->out = NULL;
+ }
+}
+
+/** Obtain the consumer this service is connected to.
+*/
+
+mlt_service mlt_service_consumer( mlt_service this )
{
// Get the service base
- mlt_service_base *base = this->private;
+ mlt_service_base *base = this->local;
- // There's a bit more required here...
- base->out = NULL;
+ // Return the connected consumer
+ return base->out;
}
-/** Associate this service to the its consumer.
+/** Obtain the producer this service is connected to.
*/
-void mlt_service_connect( mlt_service this, mlt_service that )
+mlt_service mlt_service_producer( mlt_service this )
{
// Get the service base
- mlt_service_base *base = this->private;
+ mlt_service_base *base = this->local;
- // There's a bit more required here...
- base->out = that;
+ // Return the connected producer
+ return base->count > 0 ? base->in[ base->count - 1 ] : NULL;
}
+/** Associate this service to the consumer.
+*/
+
+static void mlt_service_connect( mlt_service this, mlt_service that )
+{
+ if ( this != NULL )
+ {
+ // Get the service base
+ mlt_service_base *base = this->local;
+
+ // There's a bit more required here...
+ base->out = that;
+ }
+}
/** Get the first connected producer service.
*/
mlt_service producer = NULL;
// Get the service base
- mlt_service_base *base = this->private;
+ mlt_service_base *base = this->local;
if ( base->in != NULL )
producer = base->in[ 0 ];
return producer;
}
-
-/** Get the service state.
+/** Default implementation of get_frame.
*/
-mlt_service_state mlt_service_get_state( mlt_service this )
+static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
{
- mlt_service_state state = mlt_state_unknown;
- if ( mlt_service_has_input( this ) )
- state |= mlt_state_providing;
- if ( mlt_service_has_output( this ) )
- state |= mlt_state_connected;
- if ( state != ( mlt_state_providing | mlt_state_connected ) )
- state |= mlt_state_dormant;
- return state;
+ mlt_service_base *base = this->local;
+ if ( index < base->count )
+ {
+ mlt_service producer = base->in[ index ];
+ if ( producer != NULL )
+ return mlt_service_get_frame( producer, frame, index );
+ }
+ *frame = mlt_frame_init( );
+ return 0;
}
-/** Get the maximum number of inputs accepted.
- Returns: -1 for many, 0 for none or n for fixed.
+/** Return the properties object.
*/
-int mlt_service_accepts_input( mlt_service this )
+mlt_properties mlt_service_properties( mlt_service self )
{
- if ( this->accepts_input == NULL )
- return -1;
- else
- return this->accepts_input( this );
+ return self != NULL ? &self->parent : NULL;
}
-/** Get the maximum number of outputs accepted.
+/** Recursively apply attached filters
*/
-int mlt_service_accepts_output( mlt_service this )
+void mlt_service_apply_filters( mlt_service this, mlt_frame frame, int index )
{
- if ( this->accepts_output == NULL )
- return 1;
- else
- return this->accepts_output( this );
+ int i;
+ mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
+ mlt_properties service_properties = MLT_SERVICE_PROPERTIES( this );
+ mlt_service_base *base = this->local;
+ mlt_position position = mlt_frame_get_position( frame );
+ mlt_position this_in = mlt_properties_get_position( service_properties, "in" );
+ mlt_position this_out = mlt_properties_get_position( service_properties, "out" );
+
+ if ( index == 0 || mlt_properties_get_int( service_properties, "_filter_private" ) == 0 )
+ {
+ // Process the frame with the attached filters
+ for ( i = 0; i < base->filter_count; i ++ )
+ {
+ if ( base->filters[ i ] != NULL )
+ {
+ mlt_position in = mlt_filter_get_in( base->filters[ i ] );
+ mlt_position out = mlt_filter_get_out( base->filters[ i ] );
+ int disable = mlt_properties_get_int( MLT_FILTER_PROPERTIES( base->filters[ i ] ), "disable" );
+ if ( !disable && ( ( in == 0 && out == 0 ) || ( position >= in && ( position <= out || out == 0 ) ) ) )
+ {
+ mlt_properties_set_position( frame_properties, "in", in == 0 ? this_in : in );
+ mlt_properties_set_position( frame_properties, "out", out == 0 ? this_out : out );
+ mlt_filter_process( base->filters[ i ], frame );
+ mlt_service_apply_filters( MLT_FILTER_SERVICE( base->filters[ i ] ), frame, index + 1 );
+ }
+ }
+ }
+ }
}
-/** Determines if this service has input
+/** Obtain a frame.
*/
-int mlt_service_has_input( mlt_service this )
+int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
{
- if ( this->has_input == NULL )
- return 1;
- else
- return this->has_input( this );
-}
+ int result = 0;
-/** Determine if this service has output
-*/
+ // Lock the service
+ mlt_service_lock( this );
+
+ // Ensure that the frame is NULL
+ *frame = NULL;
+
+ // Only process if we have a valid service
+ if ( this != NULL && this->get_frame != NULL )
+ {
+ mlt_properties properties = MLT_SERVICE_PROPERTIES( this );
+ mlt_position in = mlt_properties_get_position( properties, "in" );
+ mlt_position out = mlt_properties_get_position( properties, "out" );
+
+ result = this->get_frame( this, frame, index );
+
+ if ( result == 0 )
+ {
+ mlt_properties_inc_ref( properties );
+ properties = MLT_FRAME_PROPERTIES( *frame );
+ if ( in >=0 && out > 0 )
+ {
+ mlt_properties_set_position( properties, "in", in );
+ mlt_properties_set_position( properties, "out", out );
+ }
+ mlt_service_apply_filters( this, *frame, 1 );
+ mlt_deque_push_back( MLT_FRAME_SERVICE_STACK( *frame ), this );
+ }
+ }
+
+ // Make sure we return a frame
+ if ( *frame == NULL )
+ *frame = mlt_frame_init( );
+
+ // Unlock the service
+ mlt_service_unlock( this );
+
+ return result;
+}
-int mlt_service_has_output( mlt_service this )
+static void mlt_service_filter_changed( mlt_service owner, mlt_service this )
{
- mlt_service_base *base = this->private;
- if ( this->has_output == NULL )
- return base->out != NULL;
- else
- return this->has_output( this );
+ mlt_events_fire( MLT_SERVICE_PROPERTIES( this ), "service-changed", NULL );
}
-/** Check if the service is active.
+/** Attach a filter.
*/
-int mlt_service_is_active( mlt_service this )
+int mlt_service_attach( mlt_service this, mlt_filter filter )
{
- return !( mlt_service_get_state( this ) & mlt_state_dormant );
+ int error = this == NULL || filter == NULL;
+ if ( error == 0 )
+ {
+ int i = 0;
+ mlt_properties properties = MLT_SERVICE_PROPERTIES( this );
+ mlt_service_base *base = this->local;
+
+ for ( i = 0; error == 0 && i < base->filter_count; i ++ )
+ if ( base->filters[ i ] == filter )
+ error = 1;
+
+ if ( error == 0 )
+ {
+ if ( base->filter_count == base->filter_size )
+ {
+ base->filter_size += 10;
+ base->filters = realloc( base->filters, base->filter_size * sizeof( mlt_filter ) );
+ }
+
+ if ( base->filters != NULL )
+ {
+ mlt_properties props = MLT_FILTER_PROPERTIES( filter );
+ mlt_properties_inc_ref( MLT_FILTER_PROPERTIES( filter ) );
+ base->filters[ base->filter_count ++ ] = filter;
+ mlt_events_fire( properties, "service-changed", NULL );
+ mlt_events_listen( props, this, "service-changed", ( mlt_listener )mlt_service_filter_changed );
+ mlt_events_listen( props, this, "property-changed", ( mlt_listener )mlt_service_filter_changed );
+ }
+ else
+ {
+ error = 2;
+ }
+ }
+ }
+ return error;
}
-/** Obtain a frame to pass on.
+/** Detach a filter.
*/
-static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
+int mlt_service_detach( mlt_service this, mlt_filter filter )
{
- mlt_service_base *base = this->private;
- if ( index < base->count )
+ int error = this == NULL || filter == NULL;
+ if ( error == 0 )
{
- mlt_service producer = base->in[ index ];
- if ( producer != NULL )
- return mlt_service_get_frame( producer, frame, index );
+ int i = 0;
+ mlt_service_base *base = this->local;
+ mlt_properties properties = MLT_SERVICE_PROPERTIES( this );
+
+ for ( i = 0; i < base->filter_count; i ++ )
+ if ( base->filters[ i ] == filter )
+ break;
+
+ if ( i < base->filter_count )
+ {
+ base->filters[ i ] = NULL;
+ for ( i ++ ; i < base->filter_count; i ++ )
+ base->filters[ i - 1 ] = base->filters[ i ];
+ base->filter_count --;
+ mlt_events_disconnect( MLT_FILTER_PROPERTIES( filter ), this );
+ mlt_filter_close( filter );
+ mlt_events_fire( properties, "service-changed", NULL );
+ }
}
- *frame = mlt_frame_init( );
- return 0;
+ return error;
}
-int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
+/** Retrieve a filter.
+*/
+
+mlt_filter mlt_service_filter( mlt_service this, int index )
{
- return this->get_frame( this, frame, index );
+ mlt_filter filter = NULL;
+ if ( this != NULL )
+ {
+ mlt_service_base *base = this->local;
+ if ( index >= 0 && index < base->filter_count )
+ filter = base->filters[ index ];
+ }
+ return filter;
}
/** Close the service.
void mlt_service_close( mlt_service this )
{
- mlt_service_base *base = this->private;
- free( base->in );
- free( base );
- mlt_properties_close( &this->parent );
+ mlt_service_lock( this );
+ if ( this != NULL && mlt_properties_dec_ref( MLT_SERVICE_PROPERTIES( this ) ) <= 0 )
+ {
+ mlt_service_unlock( this );
+ if ( this->close != NULL )
+ {
+ this->close( this->close_object );
+ }
+ else
+ {
+ mlt_service_base *base = this->local;
+ int i = 0;
+ int count = base->filter_count;
+ mlt_events_block( MLT_SERVICE_PROPERTIES( this ), this );
+ while( count -- )
+ mlt_service_detach( this, base->filters[ 0 ] );
+ free( base->filters );
+ for ( i = 0; i < base->count; i ++ )
+ if ( base->in[ i ] != NULL )
+ mlt_service_close( base->in[ i ] );
+ this->parent.close = NULL;
+ free( base->in );
+ pthread_mutex_destroy( &base->mutex );
+ free( base );
+ mlt_properties_close( &this->parent );
+ }
+ }
+ else
+ {
+ mlt_service_unlock( this );
+ }
}
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