2 * producer_hold.c -- frame holding producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "producer_hold.h"
27 #include <framework/mlt.h>
30 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
32 /** Constructor for the frame holding producer. Basically, all this producer does is
33 provide a producer wrapper for the requested producer, allows the specifcation of
34 the frame required and will then repeatedly obtain that frame for each get_frame
35 and get_image requested.
38 mlt_producer producer_hold_init( char *arg )
40 // Construct a new holding producer
41 mlt_producer this = mlt_producer_new( );
43 // Construct the requested producer via fezzik
44 mlt_producer producer = mlt_factory_producer( "fezzik", arg );
46 // Initialise the frame holding capabilities
47 if ( this != NULL && producer != NULL )
49 // Get the properties of this producer
50 mlt_properties properties = mlt_producer_properties( this );
53 mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
55 // Set frame, in, out and length for this producer
56 mlt_properties_set_position( properties, "frame", 0 );
57 mlt_properties_set_position( properties, "in", 0 );
58 mlt_properties_set_position( properties, "out", 25 );
59 mlt_properties_set_position( properties, "length", 15000 );
60 mlt_properties_set( properties, "resource", arg );
62 // Override the get_frame method
63 this->get_frame = producer_get_frame;
67 // Clean up (not sure which one failed, can't be bothered to find out, so close both)
69 mlt_producer_close( this );
71 mlt_producer_close( producer );
73 // Make sure we return NULL
77 // Return this producer
81 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
83 // Get the properties of the frame
84 mlt_properties properties = mlt_frame_properties( frame );
86 // Obtain the real frame
87 mlt_frame real_frame = mlt_frame_pop_service( frame );
89 // We want distorted to ensure we don't hit the resize filter twice
90 mlt_properties_set_int( properties, "distort", 1 );
92 // Get the image from the real frame
93 mlt_frame_get_image( real_frame, buffer, format, width, height, writable );
95 // Set the values obtained on the frame
96 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
97 mlt_properties_set_int( properties, "width", *width );
98 mlt_properties_set_int( properties, "height", *height );
100 // We'll deinterlace on the downstream deinterlacer
101 mlt_properties_set_int( mlt_frame_properties( real_frame ), "consumer_deinterlace", 1 );
107 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
109 // Get the properties of this producer
110 mlt_properties properties = mlt_producer_properties( this );
112 // Construct a new frame
113 *frame = mlt_frame_init( );
115 // If we have a frame, then stack the producer itself and the get_image method
116 if ( *frame != NULL )
118 // Define the real frame
119 mlt_frame real_frame = NULL;
122 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
124 // Get the frame position requested
125 mlt_position position = mlt_properties_get_position( properties, "frame" );
127 // Seek the producer to the correct place
128 mlt_producer_seek( producer, position );
130 // Get the real frame
131 mlt_service_get_frame( mlt_producer_service( producer ), &real_frame, index );
133 // Ensure that the real frame gets wiped
134 mlt_properties_set_data( mlt_frame_properties( *frame ), "real_frame", real_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
136 // Stack the real frame and method
137 mlt_frame_push_service( *frame, real_frame );
138 mlt_frame_push_service( *frame, producer_get_image );
140 // Ensure that the consumer sees what the real frame has
141 mlt_properties_pass( mlt_frame_properties( *frame ), mlt_frame_properties( real_frame ), "" );
143 // Mirror the properties of the frame
144 mlt_properties_mirror( mlt_frame_properties( *frame ), mlt_frame_properties( real_frame ) );
147 // Move to the next position
148 mlt_producer_prepare_next( this );