-/*
- * repository.c -- provides a map between service and shared objects
- * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
- * Author: Charles Yates <charles.yates@pandora.be>
+/**
+ * \file mlt_repository.c
+ * \brief provides a map between service and shared objects
+ *
+ * Copyright (C) 2003-2008 Ushodaya Enterprises Limited
+ * \author Charles Yates <charles.yates@pandora.be>
+ * Dan Dennedy <dan@dennedy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include "mlt_repository.h"
#include "mlt_properties.h"
+#include "mlt_tokeniser.h"
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
+/** \brief Repository class
+ *
+ * \extends mlt_properties_s
+ */
+
struct mlt_repository_s
{
- struct mlt_properties_s parent;
+ struct mlt_properties_s parent; // a list of object files
+ mlt_properties consumers; // lists of entry points
+ mlt_properties filters;
+ mlt_properties producers;
+ mlt_properties transitions;
};
-static char *construct_full_file( char *output, const char *prefix, const char *file )
-{
- strcpy( output, prefix );
- if ( prefix[ strlen( prefix ) - 1 ] != '/' )
- strcat( output, "/" );
- strcat( output, file );
- return output;
-}
-
-static char *chomp( char *input )
-{
- if ( input[ strlen( input ) - 1 ] == '\n' )
- input[ strlen( input ) - 1 ] = '\0';
- return input;
-}
-
-static mlt_properties construct_object( const char *prefix, const char *id )
-{
- mlt_properties output = mlt_properties_new( );
- mlt_properties_set( output, "prefix", prefix );
- mlt_properties_set( output, "id", id );
- return output;
-}
-
-static mlt_properties construct_service( mlt_properties object, const char *id )
-{
- mlt_properties output = mlt_properties_new( );
- mlt_properties_set_data( output, "object", object, 0, NULL, NULL );
- mlt_properties_set( output, "id", id );
- return output;
-}
+/** Construct a new repository
+*/
-static void *construct_instance( mlt_properties service_properties, const char *symbol, void *input )
+mlt_repository mlt_repository_init( const char *directory )
{
- // Extract the service
- char *service = mlt_properties_get( service_properties, "id" );
-
- // Get the object properties
- void *object_properties = mlt_properties_get_data( service_properties, "object", NULL );
-
- // Get the dlopen'd object
- void *object = mlt_properties_get_data( object_properties, "dlopen", NULL );
+ // Safety check
+ if ( directory == NULL || strcmp( directory, "" ) == 0 )
+ return NULL;
- // Get the dlsym'd symbol
- void *( *symbol_ptr )( const char *, void * ) = mlt_properties_get_data( object_properties, symbol, NULL );
-
- // Check that we have object and open if we don't
- if ( object == NULL )
+ // Construct the repository
+ mlt_repository this = calloc( sizeof( struct mlt_repository_s ), 1 );
+ mlt_properties_init( &this->parent, this );
+ this->consumers = mlt_properties_new();
+ this->filters = mlt_properties_new();
+ this->producers = mlt_properties_new();
+ this->transitions = mlt_properties_new();
+
+ // Get the directory list
+ mlt_properties dir = mlt_properties_new();
+ int count = mlt_properties_dir_list( dir, directory, NULL, 0 );
+ int i;
+
+ // Iterate over files
+ for ( i = 0; i < count; i++ )
{
- char full_file[ 512 ];
-
- // Get the prefix and id of the shared object
- char *prefix = mlt_properties_get( object_properties, "prefix" );
- char *file = mlt_properties_get( object_properties, "id" );
int flags = RTLD_NOW;
+ const char *object_name = mlt_properties_get_value( dir, i);
// Very temporary hack to allow the quicktime plugins to work
// TODO: extend repository to allow this to be used on a case by case basis
- if ( !strcmp( service, "kino" ) )
+ if ( strstr( object_name, "libmltkino" ) )
flags |= RTLD_GLOBAL;
- // Construct the full file
- construct_full_file( full_file, prefix, file );
-
// Open the shared object
- object = dlopen( full_file, flags );
+ void *object = dlopen( object_name, flags );
if ( object != NULL )
{
- // Set it on the properties
- mlt_properties_set_data( object_properties, "dlopen", object, 0, ( mlt_destructor )dlclose, NULL );
+ // Get the registration function
+ mlt_repository_callback symbol_ptr = dlsym( object, "mlt_register" );
+
+ // Call the registration function
+ if ( symbol_ptr != NULL )
+ {
+ symbol_ptr( this );
+
+ // Register the object file for closure
+ mlt_properties_set_data( &this->parent, object_name, object, 0, ( mlt_destructor )dlclose, NULL );
+ }
+ else
+ {
+ dlclose( object );
+ }
}
- else
+ else if ( strstr( object_name, "libmlt" ) )
{
- fprintf( stderr, "Failed to load plugin: %s\n", dlerror() );
+ fprintf( stderr, "%s, %s: failed to dlopen %s\n (%s)\n", __FILE__, __FUNCTION__, object_name, dlerror() );
}
}
- // Now check if we have this symbol pointer
- if ( object != NULL && symbol_ptr == NULL )
- {
- // Construct it now
- symbol_ptr = dlsym( object, symbol );
-
- // Set it on the properties
- mlt_properties_set_data( object_properties, "dlsym", symbol_ptr, 0, NULL, NULL );
- }
+ mlt_properties_close( dir );
- // Construct the service
- return symbol_ptr != NULL ? symbol_ptr( service, input ) : NULL;
+ return this;
}
-mlt_repository mlt_repository_init( mlt_properties object_list, const char *prefix, const char *data, const char *symbol )
+static mlt_properties new_service( void *symbol )
{
- char full_file[ 512 ];
- FILE *file;
+ mlt_properties properties = mlt_properties_new();
+ mlt_properties_set_data( properties, "symbol", symbol, 0, NULL, NULL );
+ return properties;
+}
- // Construct the repository
- mlt_repository this = calloc( sizeof( struct mlt_repository_s ), 1 );
- mlt_properties_init( &this->parent, this );
+/** Register a service with the repository
+ Typically, this is invoked by a module within its mlt_register().
+*/
- // Add the symbol to THIS repository properties.
- mlt_properties_set( &this->parent, "_symbol", symbol );
+void mlt_repository_register( mlt_repository this, mlt_service_type service_type, const char *service, mlt_register_callback symbol )
+{
+ // Add the entry point to the corresponding service list
+ switch ( service_type )
+ {
+ case consumer_type:
+ mlt_properties_set_data( this->consumers, service, new_service( symbol ), 0, ( mlt_destructor )mlt_properties_close, NULL );
+ break;
+ case filter_type:
+ mlt_properties_set_data( this->filters, service, new_service( symbol ), 0, ( mlt_destructor )mlt_properties_close, NULL );
+ break;
+ case producer_type:
+ mlt_properties_set_data( this->producers, service, new_service( symbol ), 0, ( mlt_destructor )mlt_properties_close, NULL );
+ break;
+ case transition_type:
+ mlt_properties_set_data( this->transitions, service, new_service( symbol ), 0, ( mlt_destructor )mlt_properties_close, NULL );
+ break;
+ default:
+ break;
+ }
+}
- // Construct full file
- construct_full_file( full_file, prefix, data );
- strcat( full_file, ".dat" );
+static mlt_properties get_service_properties( mlt_repository this, mlt_service_type type, const char *service )
+{
+ mlt_properties service_properties = NULL;
+
+ // Get the entry point from the corresponding service list
+ switch ( type )
+ {
+ case consumer_type:
+ service_properties = mlt_properties_get_data( this->consumers, service, NULL );
+ break;
+ case filter_type:
+ service_properties = mlt_properties_get_data( this->filters, service, NULL );
+ break;
+ case producer_type:
+ service_properties = mlt_properties_get_data( this->producers, service, NULL );
+ break;
+ case transition_type:
+ service_properties = mlt_properties_get_data( this->transitions, service, NULL );
+ break;
+ default:
+ break;
+ }
+ return service_properties;
+}
- // Open the file
- file = fopen( full_file, "r" );
+/** Construct a new instance of a service
+*/
- // Parse the contents
- if ( file != NULL )
+void *mlt_repository_create( mlt_repository this, mlt_profile profile, mlt_service_type type, const char *service, void *input )
+{
+ mlt_properties properties = get_service_properties( this, type, service );
+ if ( properties != NULL )
{
- char full[ 512 ];
- char service[ 256 ];
- char object[ 256 ];
+ mlt_register_callback symbol_ptr = mlt_properties_get_data( properties, "symbol", NULL );
- while( fgets( full, 512, file ) )
- {
- chomp( full );
+ // Construct the service
+ return ( symbol_ptr != NULL ) ? symbol_ptr( profile, type, service, input ) : NULL;
+ }
+ return NULL;
+}
- if ( full[ 0 ] != '#' && full[ 0 ] != '\0' && sscanf( full, "%s %s", service, object ) == 2 )
- {
- // Get the object properties first
- mlt_properties object_properties = mlt_properties_get_data( object_list, object, NULL );
+/** Destroy a repository
+*/
- // If their are no properties, create them now
- if ( object_properties == NULL )
- {
- // Construct the object
- object_properties = construct_object( prefix, object );
+void mlt_repository_close( mlt_repository this )
+{
+ mlt_properties_close( this->consumers );
+ mlt_properties_close( this->filters );
+ mlt_properties_close( this->producers );
+ mlt_properties_close( this->transitions );
+ mlt_properties_close( &this->parent );
+ free( this );
+}
- // Add it to the object list
- mlt_properties_set_data( object_list, object, object_properties, 0, ( mlt_destructor )mlt_properties_close, NULL );
- }
+/** Get the list of registered consumers
+*/
- // Now construct a property for the service
- mlt_properties service_properties = construct_service( object_properties, service );
+mlt_properties mlt_repository_consumers( mlt_repository self )
+{
+ return self->consumers;
+}
- // Add it to the repository
- mlt_properties_set_data( &this->parent, service, service_properties, 0, ( mlt_destructor )mlt_properties_close, NULL );
- }
- }
+/** Get the list of registered filters
+*/
- // Close the file
- fclose( file );
- }
+mlt_properties mlt_repository_filters( mlt_repository self )
+{
+ return self->filters;
+}
- return this;
+/** Get the list of registered producers
+*/
+
+mlt_properties mlt_repository_producers( mlt_repository self )
+{
+ return self->producers;
}
-void *mlt_repository_fetch( mlt_repository this, const char *service, void *input )
+/** Get the list of registered transitions
+*/
+
+mlt_properties mlt_repository_transitions( mlt_repository self )
{
- // Get the service properties
- mlt_properties service_properties = mlt_properties_get_data( &this->parent, service, NULL );
+ return self->transitions;
+}
- // If the service exists
- if ( service_properties != NULL )
+/** Register the metadata for a service
+ IMPORTANT: mlt_repository will take responsibility for deallocating the metadata properties that you supply!
+*/
+void mlt_repository_register_metadata( mlt_repository self, mlt_service_type type, const char *service, mlt_metadata_callback callback, void *callback_data )
+{
+ mlt_properties service_properties = get_service_properties( self, type, service );
+ mlt_properties_set_data( service_properties, "metadata_cb", callback, 0, NULL, NULL );
+ mlt_properties_set_data( service_properties, "metadata_cb_data", callback_data, 0, NULL, NULL );
+}
+
+/** Get the metadata about a service
+ Returns NULL if service or its metadata are unavailable.
+*/
+
+mlt_properties mlt_repository_metadata( mlt_repository self, mlt_service_type type, const char *service )
+{
+ mlt_properties metadata = NULL;
+ mlt_properties properties = get_service_properties( self, type, service );
+
+ // If this is a valid service
+ if ( properties )
{
- // Get the symbol that is used to generate this service
- char *symbol = mlt_properties_get( &this->parent, "_symbol" );
+ // Lookup cached metadata
+ metadata = mlt_properties_get_data( properties, "metadata", NULL );
+ if ( ! metadata )
+ {
+ // Not cached, so get the registered metadata callback function
+ mlt_metadata_callback callback = mlt_properties_get_data( properties, "metadata_cb", NULL );
- // Now get an instance of the service
- return construct_instance( service_properties, symbol, input );
- }
+ // If a metadata callback function is registered
+ if ( callback )
+ {
+ // Fetch the callback data arg
+ void *data = mlt_properties_get_data( properties, "metadata_cb_data", NULL );
- return NULL;
+ // Fetch the metadata through the callback
+ metadata = callback( type, service, data );
+
+ // Cache the metadata
+ if ( metadata )
+ // Include dellocation and serialisation
+ mlt_properties_set_data( properties, "metadata", metadata, 0, ( mlt_destructor )mlt_properties_close, ( mlt_serialiser )mlt_properties_serialise_yaml );
+ }
+ }
+ }
+ return metadata;
}
-void mlt_repository_close( mlt_repository this )
+static char *getenv_locale()
{
- mlt_properties_close( &this->parent );
- free( this );
+ char *s = getenv( "LANGUAGE" );
+ if ( s && s[0] )
+ return s;
+ s = getenv( "LC_ALL" );
+ if ( s && s[0] )
+ return s;
+ s = getenv( "LC_MESSAGES" );
+ if ( s && s[0] )
+ return s;
+ s = getenv( "LANG" );
+ if ( s && s[0] )
+ return s;
+ return NULL;
}
+/** Return a list of user-preferred language codes taken from environment variables.
+*/
+
+mlt_properties mlt_repository_languages( mlt_repository self )
+{
+ mlt_properties languages = mlt_properties_get_data( &self->parent, "languages", NULL );
+ if ( languages )
+ return languages;
+ languages = mlt_properties_new();
+ char *locale = getenv_locale();
+ if ( locale )
+ {
+ locale = strdup( locale );
+ mlt_tokeniser tokeniser = mlt_tokeniser_init();
+ int count = mlt_tokeniser_parse_new( tokeniser, locale, ":" );
+ if ( count )
+ {
+ int i;
+ for ( i = 0; i < count; i++ )
+ {
+ char *locale = mlt_tokeniser_get_string( tokeniser, i );
+ if ( strcmp( locale, "C" ) == 0 || strcmp( locale, "POSIX" ) == 0 )
+ locale = "en";
+ else if ( strlen( locale ) > 2 )
+ locale[2] = 0;
+ char string[21];
+ snprintf( string, sizeof(string), "%d", i );
+ mlt_properties_set( languages, string, locale );
+ }
+ }
+ else
+ {
+ mlt_properties_set( languages, "0", "en" );
+ }
+ free( locale );
+ mlt_tokeniser_close( tokeniser );
+ }
+ else
+ {
+ mlt_properties_set( languages, "0", "en" );
+ }
+ mlt_properties_set_data( &self->parent, "languages", languages, 0, ( mlt_destructor )mlt_properties_close, NULL );
+ return languages;
+}
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