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>
33 static inline void swap_bytes( uint8_t *upper, uint8_t *lower )
40 static uint8_t *resize_alpha( uint8_t *input, int owidth, int oheight, int iwidth, int iheight, uint8_t alpha_value )
42 uint8_t *output = NULL;
44 if ( input != NULL && ( iwidth != owidth || iheight != oheight ) && ( owidth > 6 && oheight > 6 ) )
47 int offset_x = ( owidth - iwidth ) / 2;
48 int offset_y = ( oheight - iheight ) / 2;
51 output = mlt_pool_alloc( owidth * oheight );
52 memset( output, alpha_value, owidth * oheight );
54 offset_x -= offset_x % 2;
56 out_line = output + offset_y * owidth;
59 // Loop for the entirety of our output height.
62 // We're in the input range for this row.
63 memcpy( out_line, input, iused );
65 // Move to next input line
68 // Move to next output line
76 static void resize_image( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight, int bpp )
79 int istride = iwidth * bpp;
80 int ostride = owidth * bpp;
81 int offset_x = ( owidth - iwidth ) / 2 * bpp;
82 int offset_y = ( oheight - iheight ) / 2;
83 uint8_t *in_line = input;
85 int size = owidth * oheight;
89 if ( output == NULL || input == NULL || ( owidth <= 6 || oheight <= 6 || iwidth <= 6 || oheight <= 6 ) )
93 else if ( iwidth == owidth && iheight == oheight )
95 memcpy( output, input, iheight * istride );
106 offset_x -= offset_x % 4;
115 out_line = output + offset_y * ostride;
116 out_line += offset_x;
118 // Loop for the entirety of our output height.
121 // We're in the input range for this row.
122 memcpy( out_line, in_line, istride );
124 // Move to next input line
127 // Move to next output line
132 /** A padding function for frames - this does not rescale, but simply
136 static uint8_t *frame_resize_image( mlt_frame this, int owidth, int oheight, int bpp )
139 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
141 // Get the input image, width and height
142 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
143 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
145 mlt_properties_get_data( properties, "alpha", &alpha_size );
147 int iwidth = mlt_properties_get_int( properties, "width" );
148 int iheight = mlt_properties_get_int( properties, "height" );
150 // If width and height are correct, don't do anything
151 if ( iwidth < owidth || iheight < oheight )
153 uint8_t alpha_value = mlt_properties_get_int( properties, "resize_alpha" );
155 // Create the output image
156 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * bpp );
158 // Call the generic resize
159 resize_image( output, owidth, oheight, input, iwidth, iheight, bpp );
161 // Now update the frame
162 mlt_frame_set_image( this, output, owidth * ( oheight + 1 ) * bpp, mlt_pool_release );
164 // We should resize the alpha too
165 if ( alpha && alpha_size >= iwidth * iheight )
167 alpha = resize_alpha( alpha, owidth, oheight, iwidth, iheight, alpha_value );
170 mlt_frame_set_alpha( this, alpha, owidth * oheight, mlt_pool_release );
171 this->get_alpha_mask = NULL;
178 // No change, return input
185 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
189 // Get the properties from the frame
190 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
192 // Pop the top of stack now
193 mlt_filter filter = mlt_frame_pop_service( this );
195 // Retrieve the aspect ratio
196 double aspect_ratio = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
197 double consumer_aspect = mlt_profile_sar( mlt_service_profile( MLT_FILTER_SERVICE( filter ) ) );
199 // Correct Width/height if necessary
200 if ( *width == 0 || *height == 0 )
202 *width = mlt_properties_get_int( properties, "normalised_width" );
203 *height = mlt_properties_get_int( properties, "normalised_height" );
206 // Assign requested width/height from our subordinate
208 int oheight = *height;
210 // Check for the special case - no aspect ratio means no problem :-)
211 if ( aspect_ratio == 0.0 )
212 aspect_ratio = consumer_aspect;
214 // Reset the aspect ratio
215 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
218 char *rescale = mlt_properties_get( properties, "rescale.interp" );
219 if ( rescale != NULL && !strcmp( rescale, "none" ) )
220 return mlt_frame_get_image( this, image, format, width, height, writable );
222 if ( mlt_properties_get_int( properties, "distort" ) == 0 )
224 // Normalise the input and out display aspect
225 int normalised_width = mlt_properties_get_int( properties, "normalised_width" );
226 int normalised_height = mlt_properties_get_int( properties, "normalised_height" );
227 int real_width = mlt_properties_get_int( properties, "real_width" );
228 int real_height = mlt_properties_get_int( properties, "real_height" );
229 if ( real_width == 0 )
230 real_width = mlt_properties_get_int( properties, "width" );
231 if ( real_height == 0 )
232 real_height = mlt_properties_get_int( properties, "height" );
233 double input_ar = aspect_ratio * real_width / real_height;
234 double output_ar = consumer_aspect * owidth / oheight;
236 // fprintf( stderr, "real %dx%d normalised %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
237 // real_width, real_height, normalised_width, normalised_height, owidth, oheight, aspect_ratio, input_ar, output_ar);
239 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
240 int scaled_width = rint( ( input_ar * normalised_width ) / output_ar );
241 int scaled_height = normalised_height;
243 // Now ensure that our images fit in the output frame
244 if ( scaled_width > normalised_width )
246 scaled_width = normalised_width;
247 scaled_height = rint( ( output_ar * normalised_height ) / input_ar );
250 // Now calculate the actual image size that we want
251 owidth = rint( scaled_width * owidth / normalised_width );
252 oheight = rint( scaled_height * oheight / normalised_height );
254 // Tell frame we have conformed the aspect to the consumer
255 mlt_frame_set_aspect_ratio( this, consumer_aspect );
258 mlt_properties_set_int( properties, "distort", 0 );
260 // Now pass on the calculations down the line
261 mlt_properties_set_int( properties, "resize_width", *width );
262 mlt_properties_set_int( properties, "resize_height", *height );
265 if ( *format == mlt_image_yuv422 )
266 owidth -= owidth % 2;
267 error = mlt_frame_get_image( this, image, format, &owidth, &oheight, writable );
269 if ( error == 0 && *image )
271 // Get the requested scale operation
272 char *op = mlt_properties_get( MLT_FILTER_PROPERTIES( filter ), "scale" );
274 int size = mlt_image_format_size( *format, owidth, oheight, &bpp );
275 int tff = mlt_properties_get_int( properties, "consumer_tff" );
277 // Provides a manual override for misreported field order
278 if ( mlt_properties_get( properties, "meta.top_field_first" ) )
279 mlt_properties_set_int( properties, "top_field_first", mlt_properties_get_int( properties, "meta.top_field_first" ) );
281 // Correct field order if needed
282 if ( mlt_properties_get_int( properties, "top_field_first" ) != tff &&
283 mlt_properties_get( properties, "progressive" ) &&
284 mlt_properties_get_int( properties, "progressive" ) == 0 )
286 // Get the input image, width and height
287 uint8_t *new_image = mlt_pool_alloc( size );
288 mlt_frame_set_image( this, new_image, size, mlt_pool_release );
289 uint8_t *ptr = new_image + owidth * bpp;
290 memcpy( new_image, *image, owidth * bpp );
291 memcpy( ptr, *image, owidth * ( oheight - 1 ) * bpp );
294 // Set the normalised field order
295 mlt_properties_set_int( properties, "top_field_first", tff );
296 mlt_properties_set_int( properties, "meta.top_field_first", tff );
299 if ( !strcmp( op, "affine" ) )
301 // TODO: Determine where this is needed and find a different way
302 // *image = mlt_frame_rescale_image( this, *width, *height, bpp );
304 else if ( strcmp( op, "none" ) != 0 )
306 *image = frame_resize_image( this, *width, *height, bpp );
318 /** Filter processing.
321 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
323 // Store the aspect ratio reported by the source
324 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame ), mlt_frame_get_aspect_ratio( frame ) );
326 // Push this on to the service stack
327 mlt_frame_push_service( frame, this );
329 // Push the get_image method on to the stack
330 mlt_frame_push_get_image( frame, filter_get_image );
335 /** Constructor for the filter.
338 mlt_filter filter_resize_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
340 mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
341 if ( mlt_filter_init( this, this ) == 0 )
343 this->process = filter_process;
344 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "scale", arg == NULL ? "off" : arg );