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 "consumer_null.h"
25 #include <framework/mlt_frame.h>
27 // System header files
33 // Forward references.
34 static int consumer_start( mlt_consumer this );
35 static int consumer_stop( mlt_consumer this );
36 static int consumer_is_stopped( mlt_consumer this );
37 static void *consumer_thread( void *arg );
38 static void consumer_close( mlt_consumer this );
40 /** Initialise the dv consumer.
43 mlt_consumer consumer_null_init( char *arg )
45 // Allocate the consumer
46 mlt_consumer this = mlt_consumer_new( );
48 // If memory allocated and initialises without error
51 // Assign close callback
52 this->close = consumer_close;
54 // Set up start/stop/terminated callbacks
55 this->start = consumer_start;
56 this->stop = consumer_stop;
57 this->is_stopped = consumer_is_stopped;
64 /** Start the consumer.
67 static int consumer_start( mlt_consumer this )
70 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
72 // Check that we're not already running
73 if ( !mlt_properties_get_int( properties, "running" ) )
76 pthread_t *thread = calloc( 1, sizeof( pthread_t ) );
78 // Assign the thread to properties
79 mlt_properties_set_data( properties, "thread", thread, sizeof( pthread_t ), free, NULL );
81 // Set the running state
82 mlt_properties_set_int( properties, "running", 1 );
83 mlt_properties_set_int( properties, "joined", 0 );
86 pthread_create( thread, NULL, consumer_thread, this );
91 /** Stop the consumer.
94 static int consumer_stop( mlt_consumer this )
97 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
99 // Check that we're running
100 if ( !mlt_properties_get_int( properties, "joined" ) )
103 pthread_t *thread = mlt_properties_get_data( properties, "thread", NULL );
106 mlt_properties_set_int( properties, "running", 0 );
107 mlt_properties_set_int( properties, "joined", 1 );
109 // Wait for termination
110 pthread_join( *thread, NULL );
116 /** Determine if the consumer is stopped.
119 static int consumer_is_stopped( mlt_consumer this )
121 // Get the properties
122 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
123 return !mlt_properties_get_int( properties, "running" );
126 /** The main thread - the argument is simply the consumer.
129 static void *consumer_thread( void *arg )
131 // Map the argument to the object
132 mlt_consumer this = arg;
134 // Get the properties
135 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
137 // Convenience functionality
138 int terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
142 mlt_frame frame = NULL;
144 // Loop while running
145 while( !terminated && mlt_properties_get_int( properties, "running" ) )
148 frame = mlt_consumer_rt_frame( this );
150 // Check for termination
151 if ( terminate_on_pause && frame != NULL )
152 terminated = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0;
154 // Check that we have a frame to work with
158 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
159 mlt_frame_close( frame );
163 // Indicate that the consumer is stopped
164 mlt_properties_set_int( properties, "running", 0 );
165 mlt_consumer_stopped( this );
170 /** Close the consumer.
173 static void consumer_close( mlt_consumer this )
176 mlt_consumer_stop( this );
179 mlt_consumer_close( this );