X-Git-Url: http://research.m1stereo.tv/gitweb?a=blobdiff_plain;f=src%2Fframework%2Fmlt_service.c;h=d693f23298e4cd935d0a39a89c913b4af9adcf5b;hb=461a447d3b38516f101a346dcb5e8ad0cb8a6927;hp=92018657fc1baa5528d748001305321cce3101e5;hpb=9c7b399431ffc490bf0dac9833a301f76f433623;p=melted diff --git a/src/framework/mlt_service.c b/src/framework/mlt_service.c index 9201865..d693f23 100644 --- a/src/framework/mlt_service.c +++ b/src/framework/mlt_service.c @@ -1,7 +1,10 @@ -/* - * mlt_service.c -- interface for all service classes - * Copyright (C) 2003-2004 Ushodaya Enterprises Limited - * Author: Charles Yates +/** + * \file mlt_service.c + * \brief interface definition for all service classes + * \see mlt_service_s + * + * Copyright (C) 2003-2009 Ushodaya Enterprises Limited + * \author Charles Yates * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -26,18 +29,17 @@ #include #include -/** IMPORTANT NOTES +/* IMPORTANT NOTES The base service implements a null frame producing service - as such, - it is functional without extension and will produce test cards frames + it is functional without extension and will produce test cards frames and PAL sized audio frames. - PLEASE DO NOT CHANGE THIS BEHAVIOUR!!! OVERRIDE THE METHODS THAT + PLEASE DO NOT CHANGE THIS BEHAVIOUR!!! OVERRIDE THE METHODS THAT CONTROL THIS IN EXTENDING CLASSES. */ -/** Private service definition. -*/ +/** \brief private service definition */ typedef struct { @@ -52,16 +54,21 @@ typedef struct } mlt_service_base; -/** Private methods -*/ +/* 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 -*/ +/** Initialize a service. + * + * \public \memberof mlt_service_s + * \param this the service structure to initialize + * \param child pointer to the child object for the subclass + * \return true if there was an error + */ int mlt_service_init( mlt_service this, void *child ) { @@ -78,7 +85,7 @@ int mlt_service_init( mlt_service this, void *child ) // Associate the methods this->get_frame = service_get_frame; - + // Initialise the properties error = mlt_properties_init( &this->parent, this ); if ( error == 0 ) @@ -95,24 +102,54 @@ int mlt_service_init( mlt_service this, void *child ) return error; } +/** The transmitter for property changes. + * + * Invokes the listener. + * + * \private \memberof mlt_service_s + * \param listener a function pointer that will be invoked + * \param owner a properties list that will be passed to \p listener + * \param this a service that will be passed to \p listener + * \param args an array of pointers - the first entry is passed as a string to \p listener + */ + 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 ] ); } +/** Acquire a mutual exclusion lock on this service. + * + * \public \memberof mlt_service_s + * \param this the service to lock + */ + void mlt_service_lock( mlt_service this ) { if ( this != NULL ) pthread_mutex_lock( &( ( mlt_service_base * )this->local )->mutex ); } +/** Release a mutual exclusion lock on this service. + * + * \public \memberof mlt_service_s + * \param this the service to unlock + */ + void mlt_service_unlock( mlt_service this ) { if ( this != NULL ) pthread_mutex_unlock( &( ( mlt_service_base * )this->local )->mutex ); } +/** Identify the subclass of the service. + * + * \public \memberof mlt_service_s + * \param this a service + * \return the subclass + */ + mlt_service_type mlt_service_identify( mlt_service this ) { mlt_service_type type = invalid_type; @@ -143,12 +180,17 @@ mlt_service_type mlt_service_identify( mlt_service this ) return type; } -/** Connect a producer service. - Returns: > 0 warning, == 0 success, < 0 serious error - 1 = this service does not accept input - 2 = the producer is invalid - 3 = the producer is already registered with this consumer -*/ +/** Connect a producer to the service. + * + * \public \memberof mlt_service_s + * \param this a service + * \param producer a producer + * \param index which of potentially multiple producers to this service (0 based) + * \return > 0 warning, == 0 success, < 0 serious error, + * 1 = this service does not accept input, + * 2 = the producer is invalid, + * 3 = the producer is already registered with this consumer + */ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int index ) { @@ -188,18 +230,14 @@ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int in // 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 ); - + // Add the service to index specified base->in[ index ] = producer; - + // Determine the number of active tracks if ( index >= base->count ) base->count = index + 1; @@ -220,7 +258,10 @@ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int in } /** Disconnect this service from its consumer. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + */ static void mlt_service_disconnect( mlt_service this ) { @@ -235,7 +276,11 @@ static void mlt_service_disconnect( mlt_service this ) } /** Obtain the consumer this service is connected to. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \return the consumer + */ mlt_service mlt_service_consumer( mlt_service this ) { @@ -247,7 +292,11 @@ mlt_service mlt_service_consumer( mlt_service this ) } /** Obtain the producer this service is connected to. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \return the last-most producer + */ mlt_service mlt_service_producer( mlt_service this ) { @@ -258,8 +307,13 @@ mlt_service mlt_service_producer( mlt_service this ) return base->count > 0 ? base->in[ base->count - 1 ] : NULL; } -/** Associate this service to the consumer. -*/ +/** Associate this service to a consumer. + * + * Overwrites connection to any existing consumer. + * \private \memberof mlt_service_s + * \param this a service + * \param that a consumer + */ static void mlt_service_connect( mlt_service this, mlt_service that ) { @@ -273,8 +327,12 @@ static void mlt_service_connect( mlt_service this, mlt_service that ) } } -/** Get the first connected producer service. -*/ +/** Get the first connected producer. + * + * \public \memberof mlt_service_s + * \param this a service + * \return the first producer + */ mlt_service mlt_service_get_producer( mlt_service this ) { @@ -285,12 +343,18 @@ mlt_service mlt_service_get_producer( mlt_service this ) if ( base->in != NULL ) producer = base->in[ 0 ]; - + return producer; } -/** Default implementation of get_frame. -*/ +/** Default implementation of the get_frame virtual function. + * + * \private \memberof mlt_service_s + * \param this a service + * \param[out] frame a frame by reference + * \param index as determined by the producer + * \return false + */ static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index ) { @@ -306,15 +370,24 @@ static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index ) } /** Return the properties object. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \return the properties + */ -mlt_properties mlt_service_properties( mlt_service self ) +mlt_properties mlt_service_properties( mlt_service this ) { - return self != NULL ? &self->parent : NULL; + return this != NULL ? &this->parent : NULL; } -/** Recursively apply attached filters -*/ +/** Recursively apply attached filters. + * + * \public \memberof mlt_service_s + * \param this a service + * \param frame a frame + * \param index used to track depth of recursion, top caller should supply 0 + */ void mlt_service_apply_filters( mlt_service this, mlt_frame frame, int index ) { @@ -349,7 +422,13 @@ void mlt_service_apply_filters( mlt_service this, mlt_frame frame, int index ) } /** Obtain a frame. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \param[out] frame a frame by reference + * \param index as determined by the producer + * \return true if there was an error + */ int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index ) { @@ -394,13 +473,25 @@ int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index ) return result; } +/** The service-changed event handler. + * + * \private \memberof mlt_service_s + * \param owner ignored + * \param this the service on which the "service-changed" event is fired + */ + static void mlt_service_filter_changed( mlt_service owner, mlt_service this ) { mlt_events_fire( MLT_SERVICE_PROPERTIES( this ), "service-changed", NULL ); } /** Attach a filter. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \param filter the filter to attach + * \return true if there was an error + */ int mlt_service_attach( mlt_service this, mlt_filter filter ) { @@ -442,7 +533,12 @@ int mlt_service_attach( mlt_service this, mlt_filter filter ) } /** Detach a filter. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \param filter the filter to detach + * \return true if there was an error + */ int mlt_service_detach( mlt_service this, mlt_filter filter ) { @@ -472,7 +568,12 @@ int mlt_service_detach( mlt_service this, mlt_filter filter ) } /** Retrieve a filter. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \param index which one of potentially multiple filters + * \return the filter or null if there was an error + */ mlt_filter mlt_service_filter( mlt_service this, int index ) { @@ -487,22 +588,27 @@ mlt_filter mlt_service_filter( mlt_service this, int index ) } /** Retrieve the profile. -*/ + * + * \public \memberof mlt_service_s + * \param this a service + * \return the profile + */ mlt_profile mlt_service_profile( mlt_service this ) { return mlt_properties_get_data( MLT_SERVICE_PROPERTIES( this ), "_profile", NULL ); } -/** Close the service. -*/ +/** Destroy a service. + * + * \public \memberof mlt_service_s + * \param this the service to destroy + */ void mlt_service_close( mlt_service this ) { - 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 ); @@ -531,4 +637,3 @@ void mlt_service_close( mlt_service this ) mlt_service_unlock( this ); } } -