2 * filter_autotrack_rectangle.c
5 * /author Zachary Drew, Copyright 2005
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include "filter_motion_est.h"
24 #include "arrow_code.h"
26 #include <framework/mlt.h>
33 #define MIN(a,b) ((a) > (b) ? (b) : (a))
35 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
36 #define ABS(a) ((a) >= 0 ? (a) : (-(a)))
38 void caculate_motion( struct motion_vector_s *vectors,
39 mlt_geometry_item boundry,
41 int macroblock_height,
47 // translate pixel units (from bounds) to macroblock units
48 // make sure whole macroblock stay within bounds
49 int left_mb = ( boundry->x + macroblock_width - 1 ) / macroblock_width;
50 int top_mb = ( boundry->y + macroblock_height - 1 ) / macroblock_height;
51 int right_mb = ( boundry->x + boundry->w ) / macroblock_width - 1;
52 int bottom_mb = ( boundry->y + boundry->h ) / macroblock_height - 1;
56 int average_x = 0, average_y = 0;
58 #define CURRENT ( vectors + j*mv_buffer_width + i )
60 for( i = left_mb; i <= right_mb; i++ ){
61 for( j = top_mb; j <= bottom_mb; j++ )
64 average_x += CURRENT->dx;
65 average_y += CURRENT->dy;
75 int average2_x = 0, average2_y = 0;
76 for( i = left_mb; i <= right_mb; i++ ){
77 for( j = top_mb; j <= bottom_mb; j++ ){
79 if( ABS(CURRENT->dx - average_x) < 3 &&
80 ABS(CURRENT->dy - average_y) < 3 )
83 average2_x += CURRENT->dx;
84 average2_y += CURRENT->dy;
91 boundry->x -= (double)average2_x / (double)n;
92 boundry->y -= (double)average2_y / (double)n;
95 // Image stack(able) method
96 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
99 // Get the filter object
100 mlt_filter filter = mlt_frame_pop_service( frame );
102 // Get the filter's property object
103 mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter);
105 // Get the frame properties
106 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(frame);
108 // Get the frame position
109 mlt_position position = mlt_frame_get_position( frame );
112 int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
115 mlt_properties_debug( frame_properties, "error after mlt_frame_get_image() in autotrack_rectangle", stderr );
117 // Get the geometry object
118 mlt_geometry geometry = mlt_properties_get_data(filter_properties, "geometry", NULL);
120 // Get the current geometry item
121 struct mlt_geometry_item_s boundry;
122 mlt_geometry_fetch(geometry, &boundry, position);
124 // Get the motion vectors
125 struct motion_vector_s *vectors = mlt_properties_get_data( frame_properties, "motion_est.vectors", NULL );
127 // How did the rectangle move?
128 if( vectors != NULL &&
129 boundry.key != 1 ) // Paused?
132 int method = mlt_properties_get_int( filter_properties, "method" );
134 // Get the size of macroblocks in pixel units
135 int macroblock_height = mlt_properties_get_int( frame_properties, "motion_est.macroblock_height" );
136 int macroblock_width = mlt_properties_get_int( frame_properties, "motion_est.macroblock_width" );
137 int mv_buffer_width = *width / macroblock_width;
139 caculate_motion( vectors, &boundry, macroblock_width, macroblock_height, mv_buffer_width, method );
142 // Make the geometry object a real boy
149 mlt_geometry_insert(geometry, &boundry);
152 if( mlt_properties_get_int( filter_properties, "debug" ) == 1 )
154 init_arrows( format, *width, *height );
155 draw_rectangle_outline(*image, boundry.x, boundry.y, boundry.w, boundry.h, 100);
161 static int attach_boundry_to_frame( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
163 // Get the filter object
164 mlt_filter filter = mlt_frame_pop_service( frame );
166 // Get the filter's property object
167 mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter);
169 // Get the frame properties
170 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(frame);
172 // Get the frame position
173 mlt_position position = mlt_frame_get_position( frame );
175 // Get the geometry object
176 mlt_geometry geometry = mlt_properties_get_data(filter_properties, "geometry", NULL);
178 // Get the current geometry item
179 mlt_geometry_item geometry_item = mlt_pool_alloc( sizeof( struct mlt_geometry_item_s ) );
180 mlt_geometry_fetch(geometry, geometry_item, position);
182 mlt_properties_set_data( frame_properties, "bounds", geometry_item, sizeof( struct mlt_geometry_item_s ), mlt_pool_release, NULL );
185 int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
188 mlt_properties_debug( frame_properties, "error after mlt_frame_get_image() in autotrack_rectangle attach_boundry_to_frame", stderr );
193 /** Filter processing.
196 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
199 /* modify the frame with the current geometry */
200 mlt_frame_push_service( frame, this);
201 mlt_frame_push_get_image( frame, attach_boundry_to_frame );
205 /* apply the motion estimation filter */
206 mlt_filter motion_est = mlt_properties_get_data( MLT_FILTER_PROPERTIES(this), "_motion_est", NULL );
207 mlt_filter_process( motion_est, frame);
211 /* calculate the new geometry based on the motion */
212 mlt_frame_push_service( frame, this);
213 mlt_frame_push_get_image( frame, filter_get_image );
216 /* visualize the motion vectors */
217 if( mlt_properties_get_int( MLT_FILTER_PROPERTIES(this), "debug" ) == 1 )
219 mlt_filter vismv = mlt_properties_get_data( MLT_FILTER_PROPERTIES(this), "_vismv", NULL );
220 if( vismv == NULL ) {
221 vismv = mlt_factory_filter( "vismv", NULL );
222 mlt_properties_set_data( MLT_FILTER_PROPERTIES(this), "_vismv", vismv, 0, (mlt_destructor)mlt_filter_close, NULL );
225 mlt_filter_process( vismv, frame );
232 /** Constructor for the filter.
236 mlt_filter filter_autotrack_rectangle_init( char *arg )
238 mlt_filter this = mlt_filter_new( );
241 this->process = filter_process;
244 mlt_geometry geometry = mlt_geometry_init();
246 // Initialize with the supplied geometry
249 struct mlt_geometry_item_s item;
251 mlt_geometry_parse_item( geometry, &item, arg );
257 mlt_geometry_insert( geometry, &item );
261 // ... and attach it to the frame
262 mlt_properties_set_data( MLT_FILTER_PROPERTIES(this), "geometry", geometry, 0, (mlt_destructor)mlt_geometry_close, (mlt_serialiser)mlt_geometry_serialise );
264 // create an instance of the motion_est filter
265 mlt_filter motion_est = mlt_factory_filter("motion_est", NULL);
266 if( motion_est != NULL )
267 mlt_properties_set_data( MLT_FILTER_PROPERTIES(this), "_motion_est", motion_est, 0, (mlt_destructor)mlt_filter_close, NULL );
269 mlt_filter_close( this );
279 /** This source code will self destruct in 5...4...3...