* Copyright (C) 2003-2004 Ushodaya Enterprises Limited
* Author: Charles Yates <charles.yates@pandora.be>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "filter_resize.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <math.h>
+
+/** Swapbytes inline.
+*/
+
+static inline void swap_bytes( uint8_t *upper, uint8_t *lower )
+{
+ uint8_t t = *lower;
+ *lower = *upper;
+ *upper = t;
+}
/** Do it :-).
*/
static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
{
- mlt_properties properties = mlt_frame_properties( this );
+ int error = 0;
+
+ // Get the properties from the frame
+ mlt_properties properties = MLT_FRAME_PROPERTIES( this );
+
+ // Pop the top of stack now
+ mlt_filter filter = mlt_frame_pop_service( this );
+
+ // Retrieve the aspect ratio
+ double aspect_ratio = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
+
+ // Assign requested width/height from our subordinate
int owidth = *width;
int oheight = *height;
-
- mlt_frame_get_image( this, image, format, &owidth, &oheight, writable );
-
- if ( *width == 0 )
- *width = 720;
- if ( *height == 0 )
- *height = 576;
-
- // Correct field order if needed
- if ( mlt_properties_get_int( properties, "top_field_first" ) == 1 )
+
+ // Check for the special case - no aspect ratio means no problem :-)
+ if ( aspect_ratio == 0.0 )
+ aspect_ratio = mlt_properties_get_double( properties, "consumer_aspect_ratio" );
+
+ // Reset the aspect ratio
+ mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
+
+ // Hmmm...
+ char *rescale = mlt_properties_get( properties, "rescale.interp" );
+ if ( rescale != NULL && !strcmp( rescale, "none" ) )
+ return mlt_frame_get_image( this, image, format, width, height, writable );
+
+ if ( mlt_properties_get_int( properties, "distort" ) == 0 )
{
- // Get the input image, width and height
- int size;
- uint8_t *image = mlt_properties_get_data( properties, "image", &size );
+ // Normalise the input and out display aspect
+ int normalised_width = mlt_properties_get_int( properties, "normalised_width" );
+ int normalised_height = mlt_properties_get_int( properties, "normalised_height" );
+ int real_width = mlt_properties_get_int( properties, "real_width" );
+ int real_height = mlt_properties_get_int( properties, "real_height" );
+ if ( real_width == 0 )
+ real_width = mlt_properties_get_int( properties, "width" );
+ if ( real_height == 0 )
+ real_height = mlt_properties_get_int( properties, "height" );
+ double input_ar = aspect_ratio * real_width / real_height;
+ double output_ar = mlt_properties_get_double( properties, "consumer_aspect_ratio" ) * owidth / oheight;
+
+ //fprintf( stderr, "normalised %dx%d output %dx%d %f %f\n", normalised_width, normalised_height, owidth, oheight, ( float )output_ar, ( float )mlt_properties_get_double( properties, "consumer_aspect_ratio" ) * owidth / oheight );
- // Keep the original image around to be destroyed on frame close
- mlt_properties_rename( properties, "image", "original_image" );
+ // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
+ int scaled_width = rint( 0.5 + ( input_ar * normalised_width ) / output_ar );
+ int scaled_height = normalised_height;
- // Offset the image pointer by one line
- image += owidth * 2;
- size -= owidth * 2;
+ // Now ensure that our images fit in the output frame
+ if ( scaled_width > normalised_width )
+ {
+ scaled_width = normalised_width;
+ scaled_height = rint( 0.5 + ( output_ar * normalised_height ) / input_ar );
+ }
- // Set the new image pointer with no destructor
- mlt_properties_set_data( properties, "image", image, size, NULL, NULL );
+ // Now calculate the actual image size that we want
+ owidth = rint( 0.5 + scaled_width * owidth / normalised_width );
+ oheight = rint( 0.5 + scaled_height * oheight / normalised_height );
- // Set the normalised field order
- mlt_properties_set_int( properties, "top_field_first", 0 );
+ // Tell frame we have conformed the aspect to the consumer
+ mlt_frame_set_aspect_ratio( this, mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
}
- if ( !strcmp( mlt_properties_get( properties, "resize.scale" ), "affine" ) )
- *image = mlt_frame_rescale_yuv422( this, *width, *height );
- else if ( strcmp( mlt_properties_get( properties, "resize.scale" ), "none" ) != 0 )
- *image = mlt_frame_resize_yuv422( this, *width, *height );
- else
+ mlt_properties_set_int( properties, "distort", 0 );
+
+ // Now pass on the calculations down the line
+ mlt_properties_set_int( properties, "resize_width", *width );
+ mlt_properties_set_int( properties, "resize_height", *height );
+
+ // Now get the image
+ error = mlt_frame_get_image( this, image, format, &owidth, &oheight, writable );
+
+ // We only know how to process yuv422 at the moment
+ if ( error == 0 && *format == mlt_image_yuv422 && *image != NULL )
{
- *width = owidth;
- *height = oheight;
+ // Get the requested scale operation
+ char *op = mlt_properties_get( MLT_FILTER_PROPERTIES( filter ), "scale" );
+
+ // Provides a manual override for misreported field order
+ if ( mlt_properties_get( properties, "meta.top_field_first" ) )
+ mlt_properties_set( properties, "top_field_first", mlt_properties_get_int( properties, "meta.top_field_first" ) );
+
+ // Correct field order if needed
+ if ( mlt_properties_get_int( properties, "top_field_first" ) == 1 )
+ {
+ // Get the input image, width and height
+ int size;
+ uint8_t *image = mlt_properties_get_data( properties, "image", &size );
+ uint8_t *ptr = image + owidth * 2;
+ int h = oheight / 2;
+ int w = owidth;
+
+ // Swap the lines around
+ while( h -- )
+ {
+ w = owidth;
+ while( w -- )
+ {
+ swap_bytes( image ++, ptr ++ );
+ swap_bytes( image ++, ptr ++ );
+ }
+ image += owidth * 2;
+ ptr += owidth * 2;
+ }
+
+ // Set the normalised field order
+ mlt_properties_set_int( properties, "top_field_first", 0 );
+ mlt_properties_set_int( properties, "meta.top_field_first", 0 );
+ }
+
+ if ( !strcmp( op, "affine" ) )
+ {
+ *image = mlt_frame_rescale_yuv422( this, *width, *height );
+ }
+ else if ( strcmp( op, "none" ) != 0 )
+ {
+ *image = mlt_frame_resize_yuv422( this, *width, *height );
+ }
+ else
+ {
+ *width = owidth;
+ *height = oheight;
+ }
}
- return 0;
+
+ return error;
}
/** Filter processing.
static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
{
+ // Store the aspect ratio reported by the source
+ mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame ), mlt_frame_get_aspect_ratio( frame ) );
+
+ // Push this on to the service stack
+ mlt_frame_push_service( frame, this );
+
+ // Push the get_image method on to the stack
mlt_frame_push_get_image( frame, filter_get_image );
- mlt_properties_set( mlt_frame_properties( frame ), "resize.scale", mlt_properties_get( mlt_filter_properties( this ), "scale" ) );
+
return frame;
}
if ( mlt_filter_init( this, this ) == 0 )
{
this->process = filter_process;
- if ( arg != NULL )
- mlt_properties_set( mlt_filter_properties( this ), "scale", arg );
- else
- mlt_properties_set( mlt_filter_properties( this ), "scale", "off" );
+ mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "scale", arg == NULL ? "off" : arg );
}
return this;
}
-
projects / melted / blobdiff