2 * filter_resize.c -- resizing filter
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 <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_profile.h>
30 static uint8_t *resize_alpha( uint8_t *input, int owidth, int oheight, int iwidth, int iheight, uint8_t alpha_value )
32 uint8_t *output = NULL;
34 if ( input != NULL && ( iwidth != owidth || iheight != oheight ) && ( owidth > 6 && oheight > 6 ) )
37 int offset_x = ( owidth - iwidth ) / 2;
38 int offset_y = ( oheight - iheight ) / 2;
41 output = mlt_pool_alloc( owidth * oheight );
42 memset( output, alpha_value, owidth * oheight );
44 offset_x -= offset_x % 2;
46 out_line = output + offset_y * owidth;
49 // Loop for the entirety of our output height.
52 // We're in the input range for this row.
53 memcpy( out_line, input, iused );
55 // Move to next input line
58 // Move to next output line
66 static void resize_image( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight, int bpp )
69 int istride = iwidth * bpp;
70 int ostride = owidth * bpp;
71 int offset_x = ( owidth - iwidth ) / 2 * bpp;
72 int offset_y = ( oheight - iheight ) / 2;
73 uint8_t *in_line = input;
75 int size = owidth * oheight;
79 if ( output == NULL || input == NULL || ( owidth <= 6 || oheight <= 6 || iwidth <= 6 || oheight <= 6 ) )
83 else if ( iwidth == owidth && iheight == oheight )
85 memcpy( output, input, iheight * istride );
96 offset_x -= offset_x % 4;
105 out_line = output + offset_y * ostride;
106 out_line += offset_x;
108 // Loop for the entirety of our output height.
111 // We're in the input range for this row.
112 memcpy( out_line, in_line, istride );
114 // Move to next input line
117 // Move to next output line
122 /** A padding function for frames - this does not rescale, but simply
126 static uint8_t *frame_resize_image( mlt_frame this, int owidth, int oheight, int bpp )
129 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
131 // Get the input image, width and height
132 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
133 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
135 mlt_properties_get_data( properties, "alpha", &alpha_size );
137 int iwidth = mlt_properties_get_int( properties, "width" );
138 int iheight = mlt_properties_get_int( properties, "height" );
140 // If width and height are correct, don't do anything
141 if ( iwidth < owidth || iheight < oheight )
143 uint8_t alpha_value = mlt_properties_get_int( properties, "resize_alpha" );
145 // Create the output image
146 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * bpp );
148 // Call the generic resize
149 resize_image( output, owidth, oheight, input, iwidth, iheight, bpp );
151 // Now update the frame
152 mlt_frame_set_image( this, output, owidth * ( oheight + 1 ) * bpp, mlt_pool_release );
154 // We should resize the alpha too
155 if ( alpha && alpha_size >= iwidth * iheight )
157 alpha = resize_alpha( alpha, owidth, oheight, iwidth, iheight, alpha_value );
160 mlt_frame_set_alpha( this, alpha, owidth * oheight, mlt_pool_release );
161 this->get_alpha_mask = NULL;
168 // No change, return input
175 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
179 // Get the properties from the frame
180 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
182 // Pop the top of stack now
183 mlt_filter filter = mlt_frame_pop_service( this );
185 // Retrieve the aspect ratio
186 double aspect_ratio = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
187 double consumer_aspect = mlt_profile_sar( mlt_service_profile( MLT_FILTER_SERVICE( filter ) ) );
189 // Correct Width/height if necessary
190 if ( *width == 0 || *height == 0 )
192 *width = mlt_properties_get_int( properties, "normalised_width" );
193 *height = mlt_properties_get_int( properties, "normalised_height" );
196 // Assign requested width/height from our subordinate
198 int oheight = *height;
200 // Check for the special case - no aspect ratio means no problem :-)
201 if ( aspect_ratio == 0.0 )
202 aspect_ratio = consumer_aspect;
204 // Reset the aspect ratio
205 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
208 char *rescale = mlt_properties_get( properties, "rescale.interp" );
209 if ( rescale != NULL && !strcmp( rescale, "none" ) )
210 return mlt_frame_get_image( this, image, format, width, height, writable );
212 if ( mlt_properties_get_int( properties, "distort" ) == 0 )
214 // Normalise the input and out display aspect
215 int normalised_width = mlt_properties_get_int( properties, "normalised_width" );
216 int normalised_height = mlt_properties_get_int( properties, "normalised_height" );
217 int real_width = mlt_properties_get_int( properties, "real_width" );
218 int real_height = mlt_properties_get_int( properties, "real_height" );
219 if ( real_width == 0 )
220 real_width = mlt_properties_get_int( properties, "width" );
221 if ( real_height == 0 )
222 real_height = mlt_properties_get_int( properties, "height" );
223 double input_ar = aspect_ratio * real_width / real_height;
224 double output_ar = consumer_aspect * owidth / oheight;
226 // fprintf( stderr, "real %dx%d normalised %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
227 // real_width, real_height, normalised_width, normalised_height, owidth, oheight, aspect_ratio, input_ar, output_ar);
229 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
230 int scaled_width = rint( ( input_ar * normalised_width ) / output_ar );
231 int scaled_height = normalised_height;
233 // Now ensure that our images fit in the output frame
234 if ( scaled_width > normalised_width )
236 scaled_width = normalised_width;
237 scaled_height = rint( ( output_ar * normalised_height ) / input_ar );
240 // Now calculate the actual image size that we want
241 owidth = rint( scaled_width * owidth / normalised_width );
242 oheight = rint( scaled_height * oheight / normalised_height );
244 // Tell frame we have conformed the aspect to the consumer
245 mlt_frame_set_aspect_ratio( this, consumer_aspect );
248 mlt_properties_set_int( properties, "distort", 0 );
250 // Now pass on the calculations down the line
251 mlt_properties_set_int( properties, "resize_width", *width );
252 mlt_properties_set_int( properties, "resize_height", *height );
255 if ( *format == mlt_image_yuv422 )
256 owidth -= owidth % 2;
257 error = mlt_frame_get_image( this, image, format, &owidth, &oheight, writable );
259 if ( error == 0 && *image )
262 mlt_image_format_size( *format, owidth, oheight, &bpp );
263 *image = frame_resize_image( this, *width, *height, bpp );
269 /** Filter processing.
272 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
274 // Store the aspect ratio reported by the source
275 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame ), mlt_frame_get_aspect_ratio( frame ) );
277 // Push this on to the service stack
278 mlt_frame_push_service( frame, this );
280 // Push the get_image method on to the stack
281 mlt_frame_push_get_image( frame, filter_get_image );
286 /** Constructor for the filter.
289 mlt_filter filter_resize_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
291 mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
292 if ( mlt_filter_init( this, this ) == 0 )
294 this->process = filter_process;