2 * filter_deinterlace.c -- deinterlace filter
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 "filter_deinterlace.h"
22 #include "deinterlace.h"
24 #include <framework/mlt_frame.h>
29 /* Linear Blend filter - C version contributed by Rogerio Brito.
30 This algorithm has the same interface as the other functions.
32 The destination "screen" (pdst) is constructed from the source
33 screen (psrc[0]) line by line.
35 The i-th line of the destination screen is the average of 3 lines
36 from the source screen: the (i-1)-th, i-th and (i+1)-th lines, with
37 the i-th line having weight 2 in the computation.
40 * each line on pdst doesn't depend on previous lines;
41 * due to the way the algorithm is defined, the first & last lines of the
42 screen aren't deinterlaced.
46 static void deinterlace_yuv( uint8_t *pdst
, uint8_t *psrc
, int width
, int height
)
49 register uint8_t *l0
, *l1
, *l2
, *l3
;
51 l0
= pdst
; // target line
52 l1
= psrc
; // 1st source line
53 l2
= l1
+ width
; // 2nd source line = line that follows l1
54 l3
= l2
+ width
; // 3rd source line = line that follows l2
56 // Copy the first line
57 memcpy(l0
, l1
, width
);
60 for (y
= 1; y
< height
-1; ++y
)
62 // computes avg of: l1 + 2*l2 + l3
63 for (x
= 0; x
< width
; ++x
)
64 l0
[x
] = (l1
[x
] + (l2
[x
]<<1) + l3
[x
]) >> 2;
66 // updates the line pointers
67 l1
= l2
; l2
= l3
; l3
+= width
;
72 memcpy(l0
, l1
, width
);
79 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
82 int deinterlace
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "consumer_deinterlace" );
84 // Pop the service off the stack
85 mlt_filter filter
= mlt_frame_pop_service( this );
87 // Determine if we need a writable version or not
88 if ( deinterlace
&& !writable
)
89 writable
= !mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "progressive" );
91 // Get the input image
92 error
= mlt_frame_get_image( this, image
, format
, width
, height
, writable
);
94 // Check that we want progressive and we aren't already progressive
95 if ( deinterlace
&& *format
== mlt_image_yuv422
&& *image
!= NULL
&& !mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "progressive" ) )
97 // Determine deinterlace method
98 char *method_str
= mlt_properties_get( MLT_FILTER_PROPERTIES( filter
), "method" );
99 int method
= DEINTERLACE_LINEARBLEND
;
100 char *frame_method_str
= mlt_properties_get( MLT_FRAME_PROPERTIES( this ), "deinterlace_method" );
102 if ( frame_method_str
!= NULL
)
103 method_str
= frame_method_str
;
105 if ( method_str
== NULL
)
106 method
= DEINTERLACE_LINEARBLEND
;
107 else if ( strcmp( method_str
, "bob" ) == 0 )
108 method
= DEINTERLACE_BOB
;
109 else if ( strcmp( method_str
, "weave" ) == 0 )
110 method
= DEINTERLACE_BOB
;
111 else if ( strcmp( method_str
, "greedy" ) == 0 )
112 method
= DEINTERLACE_GREEDY
;
113 else if ( strcmp( method_str
, "onefield" ) == 0 )
114 method
= DEINTERLACE_ONEFIELD
;
116 // Deinterlace the image
117 deinterlace_yuv( *image
, image
, *width
* 2, *height
, method
);
119 // Make sure that others know the frame is deinterlaced
120 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "progressive", 1 );
126 /** Deinterlace filter processing - this should be lazy evaluation here...
129 static mlt_frame
deinterlace_process( mlt_filter
this, mlt_frame frame
)
131 // Push this on to the service stack
132 mlt_frame_push_service( frame
, this );
134 // Push the get_image method on to the stack
135 mlt_frame_push_get_image( frame
, filter_get_image
);
140 /** Constructor for the filter.
143 mlt_filter
filter_deinterlace_init( void *arg
)
145 mlt_filter
this = mlt_filter_new( );
148 this->process
= deinterlace_process
;
149 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "method", arg
);