research.m1stereo.tv/gitweb/ - melted/blob - src/modules/xine/filter_deinterlace.c

   1 /*
   2  * filter_deinterlace.c -- deinterlace filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 #include "filter_deinterlace.h"
  22 #include "deinterlace.h"
  23
  24 #include <framework/mlt_frame.h>
  25
  26 #include <string.h>
  27 #include <stdlib.h>
  28
  29 /* Linear Blend filter - C version contributed by Rogerio Brito.
  30    This algorithm has the same interface as the other functions.
  31
  32    The destination "screen" (pdst) is constructed from the source
  33    screen (psrc[0]) line by line.
  34
  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.
  38
  39    Remarks:
  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.
  43
  44 */
  45 #if 0
  46 static void deinterlace_yuv( uint8_t *pdst, uint8_t *psrc, int width, int height )
  47 {
  48         register int x, y;
  49         register uint8_t *l0, *l1, *l2, *l3;
  50
  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
  55
  56         // Copy the first line
  57         memcpy(l0, l1, width);
  58         l0 += width;
  59
  60         for (y = 1; y < height-1; ++y)
  61         {
  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;
  65
  66                 // updates the line pointers
  67                 l1 = l2; l2 = l3; l3 += width;
  68                 l0 += width;
  69         }
  70
  71         // Copy the last line
  72         memcpy(l0, l1, width);
  73 }
  74 #endif
  75
  76 /** Do it :-).
  77 */
  78
  79 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  80 {
  81         int error = 0;
  82
  83         // Pop the service off the stack
  84         mlt_filter filter = mlt_frame_pop_service( this );
  85
  86         // Check that we want progressive and we aren't already progressive
  87         if ( *format == mlt_image_yuv422 &&
  88                  !mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "progressive" ) &&
  89                  mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "consumer_deinterlace" ) )
  90         {
  91                 // Get the input image
  92                 error = mlt_frame_get_image( this, image, format, width, height, 1 );
  93
  94                 // Determine deinterlace method
  95                 char *method_str = mlt_properties_get( MLT_FILTER_PROPERTIES( filter ), "method" );
  96                 int method = DEINTERLACE_LINEARBLEND;
  97
  98                 if ( strcmp( method_str, "bob" ) == 0 )
  99                         method = DEINTERLACE_BOB;
 100                 else if ( strcmp( method_str, "weave" ) == 0 )
 101                         method = DEINTERLACE_BOB;
 102                 else if ( strcmp( method_str, "greedy" ) == 0 )
 103                         method = DEINTERLACE_GREEDY;
 104                 else if ( strcmp( method_str, "onefield" ) == 0 )
 105                         method = DEINTERLACE_ONEFIELD;
 106
 107                 // Deinterlace the image
 108                 deinterlace_yuv( *image, image, *width * 2, *height, method );
 109
 110                 // Make sure that others know the frame is deinterlaced
 111                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "progressive", 1 );
 112         }
 113         else
 114         {
 115                 // Get the input image
 116                 error = mlt_frame_get_image( this, image, format, width, height, writable );
 117         }
 118
 119         return error;
 120 }
 121
 122 /** Deinterlace filter processing - this should be lazy evaluation here...
 123 */
 124
 125 static mlt_frame deinterlace_process( mlt_filter this, mlt_frame frame )
 126 {
 127         // Push this on to the service stack
 128         mlt_frame_push_service( frame, this );
 129
 130         // Push the get_image method on to the stack
 131         mlt_frame_push_get_image( frame, filter_get_image );
 132
 133         return frame;
 134 }
 135
 136 /** Constructor for the filter.
 137 */
 138
 139 mlt_filter filter_deinterlace_init( void *arg )
 140 {
 141         mlt_filter this = mlt_filter_new( );
 142         if ( this != NULL )
 143         {
 144                 this->process = deinterlace_process;
 145                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "method", arg == NULL ? "linearblend" : arg );
 146         }
 147         return this;
 148 }
 149