2 * filter_crop.c -- cropping filter
3 * Copyright (C) 2009 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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 <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_log.h>
24 #include <framework/mlt_profile.h>
31 static void crop( uint8_t *src, uint8_t *dest, int bpp, int width, int height, int left, int right, int top, int bottom )
33 int src_stride = ( width ) * bpp;
34 int dest_stride = ( width - left - right ) * bpp;
35 int y = height - top - bottom + 1;
36 src += top * src_stride + left * bpp;
40 memcpy( dest, src, dest_stride );
49 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
52 mlt_profile profile = mlt_frame_pop_service( frame );
54 // Get the properties from the frame
55 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
57 // Correct Width/height if necessary
58 if ( *width == 0 || *height == 0 )
60 *width = profile->width;
61 *height = profile->height;
64 int left = mlt_properties_get_int( properties, "crop.left" );
65 int right = mlt_properties_get_int( properties, "crop.right" );
66 int top = mlt_properties_get_int( properties, "crop.top" );
67 int bottom = mlt_properties_get_int( properties, "crop.bottom" );
69 // Request the image at its original resolution
70 if ( left || right || top || bottom )
72 mlt_properties_set_int( properties, "rescale_width", mlt_properties_get_int( properties, "crop.original_width" ) );
73 mlt_properties_set_int( properties, "rescale_height", mlt_properties_get_int( properties, "crop.original_height" ) );
77 error = mlt_frame_get_image( frame, image, format, width, height, writable );
79 int owidth = *width - left - right;
80 int oheight = *height - top - bottom;
81 owidth = owidth < 0 ? 0 : owidth;
82 oheight = oheight < 0 ? 0 : oheight;
84 if ( ( owidth != *width || oheight != *height ) &&
85 error == 0 && *image != NULL && owidth > 0 && oheight > 0 )
89 // Subsampled YUV is messy and less precise.
90 if ( *format == mlt_image_yuv422 && frame->convert_image )
92 mlt_image_format requested_format = mlt_image_rgb24;
93 frame->convert_image( frame, image, format, requested_format );
96 mlt_log_debug( NULL, "[filter crop] %s %dx%d -> %dx%d\n", mlt_image_format_name(*format),
97 *width, *height, owidth, oheight);
100 mlt_properties_set_int( properties, "top_field_first", !mlt_properties_get_int( properties, "top_field_first" ) );
102 // Create the output image
103 int size = mlt_image_format_size( *format, owidth, oheight, &bpp );
104 uint8_t *output = mlt_pool_alloc( size );
107 // Call the generic resize
108 crop( *image, output, bpp, *width, *height, left, right, top, bottom );
110 // Now update the frame
111 mlt_frame_set_image( frame, output, size, mlt_pool_release );
115 // We should resize the alpha too
116 uint8_t *alpha = mlt_frame_get_alpha_mask( frame );
118 mlt_properties_get_data( properties, "alpha", &alpha_size );
119 if ( alpha && alpha_size >= ( *width * *height ) )
121 uint8_t *newalpha = mlt_pool_alloc( owidth * oheight );
124 crop( alpha, newalpha, 1, *width, *height, left, right, top, bottom );
125 mlt_frame_set_alpha( frame, newalpha, owidth * oheight, mlt_pool_release );
135 /** Filter processing.
138 static mlt_frame filter_process( mlt_filter filter, mlt_frame frame )
140 if ( mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "active" ) )
142 // Push the get_image method on to the stack
143 mlt_frame_push_service( frame, mlt_service_profile( MLT_FILTER_SERVICE( filter ) ) );
144 mlt_frame_push_get_image( frame, filter_get_image );
148 mlt_properties filter_props = MLT_FILTER_PROPERTIES( filter );
149 mlt_properties frame_props = MLT_FRAME_PROPERTIES( frame );
150 int left = mlt_properties_get_int( filter_props, "left" );
151 int right = mlt_properties_get_int( filter_props, "right" );
152 int top = mlt_properties_get_int( filter_props, "top" );
153 int bottom = mlt_properties_get_int( filter_props, "bottom" );
154 int width = mlt_properties_get_int( frame_props, "meta.media.width" );
155 int height = mlt_properties_get_int( frame_props, "meta.media.height" );
156 int use_profile = mlt_properties_get_int( filter_props, "use_profile" );
157 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
161 top = top * height / profile->height;
162 bottom = bottom * height / profile->height;
163 left = left * width / profile->width;
164 right = right * width / profile->width;
166 if ( mlt_properties_get_int( filter_props, "center" ) )
168 double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
169 if ( aspect_ratio == 0.0 )
170 aspect_ratio = mlt_profile_sar( profile );
171 double input_ar = aspect_ratio * width / height;
172 double output_ar = mlt_profile_dar( mlt_service_profile( MLT_FILTER_SERVICE(filter) ) );
173 int bias = mlt_properties_get_int( filter_props, "center_bias" );
175 if ( input_ar > output_ar )
177 left = right = ( width - rint( output_ar * height / aspect_ratio ) ) / 2;
178 if ( abs(bias) > left )
179 bias = bias < 0 ? -left : left;
180 else if ( use_profile )
181 bias = bias * width / profile->width;
187 top = bottom = ( height - rint( aspect_ratio * width / output_ar ) ) / 2;
188 if ( abs(bias) > top )
189 bias = bias < 0 ? -top : top;
190 else if ( use_profile )
191 bias = bias * height / profile->height;
197 // Coerce the output to an even width because subsampled YUV with odd widths is too
198 // risky for downstream processing to handle correctly.
199 left += ( width - left - right ) & 1;
200 if ( width - left - right < 8 )
202 if ( height - top - bottom < 8 )
204 mlt_properties_set_int( frame_props, "crop.left", left );
205 mlt_properties_set_int( frame_props, "crop.right", right );
206 mlt_properties_set_int( frame_props, "crop.top", top );
207 mlt_properties_set_int( frame_props, "crop.bottom", bottom );
208 mlt_properties_set_int( frame_props, "crop.original_width", width );
209 mlt_properties_set_int( frame_props, "crop.original_height", height );
210 mlt_properties_set_int( frame_props, "meta.media.width", width - left - right );
211 mlt_properties_set_int( frame_props, "meta.media.height", height - top - bottom );
216 /** Constructor for the filter.
219 mlt_filter filter_crop_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
221 mlt_filter filter = calloc( 1, sizeof( struct mlt_filter_s ) );
222 if ( mlt_filter_init( filter, filter ) == 0 )
224 filter->process = filter_process;
226 mlt_properties_set_int( MLT_FILTER_PROPERTIES( filter ), "active", atoi( arg ) );