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 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
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
);
31 static void producer_close( mlt_producer
this );
33 /** Constructor for the frame holding producer. Basically, all this producer does is
34 provide a producer wrapper for the requested producer, allows the specifcation of
35 the frame required and will then repeatedly obtain that frame for each get_frame
36 and get_image requested.
39 mlt_producer
producer_hold_init( char *arg
)
41 // Construct a new holding producer
42 mlt_producer
this = mlt_producer_new( );
44 // Construct the requested producer via fezzik
45 mlt_producer producer
= mlt_factory_producer( "fezzik", arg
);
47 // Initialise the frame holding capabilities
48 if ( this != NULL
&& producer
!= NULL
)
50 // Get the properties of this producer
51 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
54 mlt_properties_set_data( properties
, "producer", producer
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
56 // Set frame, in, out and length for this producer
57 mlt_properties_set_position( properties
, "frame", 0 );
58 mlt_properties_set_position( properties
, "in", 0 );
59 mlt_properties_set_position( properties
, "out", 25 );
60 mlt_properties_set_position( properties
, "length", 15000 );
61 mlt_properties_set( properties
, "resource", arg
);
62 mlt_properties_set( properties
, "method", "onefield" );
64 // Override the get_frame method
65 this->get_frame
= producer_get_frame
;
66 this->close
= ( mlt_destructor
)producer_close
;
70 // Clean up (not sure which one failed, can't be bothered to find out, so close both)
72 mlt_producer_close( this );
74 mlt_producer_close( producer
);
76 // Make sure we return NULL
80 // Return this producer
84 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
86 // Get the properties of the frame
87 mlt_properties properties
= MLT_FRAME_PROPERTIES( frame
);
89 // Obtain the real frame
90 mlt_frame real_frame
= mlt_frame_pop_service( frame
);
92 // Get the image from the real frame
94 *buffer
= mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame
), "image", &size
);
95 *width
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame
), "width" );
96 *height
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame
), "height" );
98 // If this is the first time, get it from the producer
99 if ( *buffer
== NULL
)
101 mlt_properties_pass( MLT_FRAME_PROPERTIES( real_frame
), properties
, "" );
103 // We'll deinterlace on the downstream deinterlacer
104 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame
), "consumer_deinterlace", 1 );
106 // We want distorted to ensure we don't hit the resize filter twice
107 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame
), "distort", 1 );
110 mlt_frame_get_image( real_frame
, buffer
, format
, width
, height
, writable
);
112 // Make sure we get the size
113 *buffer
= mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame
), "image", &size
);
116 mlt_properties_pass( properties
, MLT_FRAME_PROPERTIES( real_frame
), "" );
118 // Set the values obtained on the frame
119 if ( *buffer
!= NULL
)
121 uint8_t *image
= mlt_pool_alloc( size
);
122 memcpy( image
, *buffer
, size
);
124 mlt_properties_set_data( properties
, "image", *buffer
, size
, mlt_pool_release
, NULL
);
128 // Pass the current image as is
129 mlt_properties_set_data( properties
, "image", *buffer
, size
, NULL
, NULL
);
132 // Make sure that no further scaling is done
133 mlt_properties_set( properties
, "rescale.interps", "none" );
134 mlt_properties_set( properties
, "scale", "off" );
140 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
142 // Get the properties of this producer
143 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
145 // Construct a new frame
146 *frame
= mlt_frame_init( );
148 // If we have a frame, then stack the producer itself and the get_image method
149 if ( *frame
!= NULL
)
151 // Define the real frame
152 mlt_frame real_frame
= mlt_properties_get_data( properties
, "real_frame", NULL
);
154 // Obtain real frame if we don't have it
155 if ( real_frame
== NULL
)
158 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
160 // Get the frame position requested
161 mlt_position position
= mlt_properties_get_position( properties
, "frame" );
163 // Seek the producer to the correct place
164 mlt_producer_seek( producer
, position
);
166 // Get the real frame
167 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer
), &real_frame
, index
);
169 // Ensure that the real frame gets wiped eventually
170 mlt_properties_set_data( properties
, "real_frame", real_frame
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
174 // Temporary fix - ensure that we aren't seen as a test frame
175 int8_t *image
= mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame
), "image", NULL
);
176 mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame
), "image", image
, 0, NULL
, NULL
);
177 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame
), "test_image", 0 );
180 // Stack the real frame and method
181 mlt_frame_push_service( *frame
, real_frame
);
182 mlt_frame_push_service( *frame
, producer_get_image
);
184 // Ensure that the consumer sees what the real frame has
185 mlt_properties_pass( MLT_FRAME_PROPERTIES( *frame
), MLT_FRAME_PROPERTIES( real_frame
), "" );
187 mlt_properties_set( MLT_FRAME_PROPERTIES( real_frame
), "deinterlace_method",
188 mlt_properties_get( properties
, "method" ) );
191 // Move to the next position
192 mlt_producer_prepare_next( this );
197 static void producer_close( mlt_producer
this )
200 mlt_producer_close( this );