2 * consumer_null.c -- a null consumer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <framework/mlt_consumer.h>
23 #include <framework/mlt_frame.h>
25 // System header files
31 // Forward references.
32 static int consumer_start( mlt_consumer
this );
33 static int consumer_stop( mlt_consumer
this );
34 static int consumer_is_stopped( mlt_consumer
this );
35 static void *consumer_thread( void *arg
);
36 static void consumer_close( mlt_consumer
this );
38 /** Initialise the dv consumer.
41 mlt_consumer
consumer_null_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
43 // Allocate the consumer
44 mlt_consumer
this = mlt_consumer_new( profile
);
46 // If memory allocated and initialises without error
49 // Assign close callback
50 this->close
= consumer_close
;
52 // Set up start/stop/terminated callbacks
53 this->start
= consumer_start
;
54 this->stop
= consumer_stop
;
55 this->is_stopped
= consumer_is_stopped
;
62 /** Start the consumer.
65 static int consumer_start( mlt_consumer
this )
68 mlt_properties properties
= MLT_CONSUMER_PROPERTIES( this );
70 // Check that we're not already running
71 if ( !mlt_properties_get_int( properties
, "running" ) )
74 pthread_t
*thread
= calloc( 1, sizeof( pthread_t
) );
76 // Assign the thread to properties
77 mlt_properties_set_data( properties
, "thread", thread
, sizeof( pthread_t
), free
, NULL
);
79 // Set the running state
80 mlt_properties_set_int( properties
, "running", 1 );
81 mlt_properties_set_int( properties
, "joined", 0 );
84 pthread_create( thread
, NULL
, consumer_thread
, this );
89 /** Stop the consumer.
92 static int consumer_stop( mlt_consumer
this )
95 mlt_properties properties
= MLT_CONSUMER_PROPERTIES( this );
97 // Check that we're running
98 if ( !mlt_properties_get_int( properties
, "joined" ) )
101 pthread_t
*thread
= mlt_properties_get_data( properties
, "thread", NULL
);
104 mlt_properties_set_int( properties
, "running", 0 );
105 mlt_properties_set_int( properties
, "joined", 1 );
107 // Wait for termination
108 pthread_join( *thread
, NULL
);
114 /** Determine if the consumer is stopped.
117 static int consumer_is_stopped( mlt_consumer
this )
119 // Get the properties
120 mlt_properties properties
= MLT_CONSUMER_PROPERTIES( this );
121 return !mlt_properties_get_int( properties
, "running" );
124 /** The main thread - the argument is simply the consumer.
127 static void *consumer_thread( void *arg
)
129 // Map the argument to the object
130 mlt_consumer
this = arg
;
132 // Get the properties
133 mlt_properties properties
= MLT_CONSUMER_PROPERTIES( this );
135 // Convenience functionality
136 int terminate_on_pause
= mlt_properties_get_int( properties
, "terminate_on_pause" );
140 mlt_frame frame
= NULL
;
142 // Loop while running
143 while( !terminated
&& mlt_properties_get_int( properties
, "running" ) )
146 frame
= mlt_consumer_rt_frame( this );
148 // Check for termination
149 if ( terminate_on_pause
&& frame
!= NULL
)
150 terminated
= mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame
), "_speed" ) == 0.0;
152 // Check that we have a frame to work with
156 mlt_events_fire( properties
, "consumer-frame-show", frame
, NULL
);
157 mlt_frame_close( frame
);
161 // Indicate that the consumer is stopped
162 mlt_properties_set_int( properties
, "running", 0 );
163 mlt_consumer_stopped( this );
168 /** Close the consumer.
171 static void consumer_close( mlt_consumer
this )
174 mlt_consumer_stop( this );
177 mlt_consumer_close( this );