--- /dev/null
+/*
+ * filter_rescale.c -- scale the producer video frame size to match the consumer
+ * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
+ * Author: Dan Dennedy <dan@dennedy.org>
+ *
+ * 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 program 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.
+ *
+ * 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.
+ */
+
+#include "filter_rescale.h"
+
+#include <framework/mlt_frame.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+typedef int ( *image_scaler )( mlt_frame this, uint8_t **image, mlt_image_format iformat, mlt_image_format oformat, int iwidth, int iheight, int owidth, int oheight );
+
+static int filter_scale( mlt_frame this, uint8_t **image, mlt_image_format iformat, mlt_image_format oformat, int iwidth, int iheight, int owidth, int oheight )
+{
+ // Get the properties
+ mlt_properties properties = mlt_frame_properties( this );
+
+ // Get the rescaling interpolsation
+ char *interps = mlt_properties_get( properties, "rescale.interp" );
+
+ // Carry out the rescaling
+ if ( iformat == mlt_image_yuv422 && oformat == mlt_image_yuv422 )
+ {
+ // Scale the frame
+ mlt_frame_rescale_yuv422( this, owidth, oheight );
+
+ // Return the output
+ *image = mlt_properties_get_data( properties, "image", NULL );
+ }
+ else if ( iformat == mlt_image_rgb24 || iformat == mlt_image_rgb24a )
+ {
+ int bpp = (iformat == mlt_image_rgb24a ? 4 : 3 );
+
+ // Create the yuv image
+ uint8_t *output = mlt_pool_alloc( iwidth * ( iheight + 1 ) * 2 );
+
+ if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
+ {
+ // Extract YUV422 and alpha
+ if ( bpp == 4 )
+ {
+ // Allocate the alpha mask
+ uint8_t *alpha = mlt_pool_alloc( iwidth * ( iheight + 1 ) );
+
+ // Convert the image and extract alpha
+ mlt_convert_rgb24a_to_yuv422( *image, iwidth, iheight, iwidth * 2, output, alpha );
+
+ mlt_properties_set_data( properties, "alpha", alpha, iwidth * ( iheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
+ }
+ else
+ {
+ // No alpha to extract
+ mlt_convert_rgb24_to_yuv422( *image, iwidth, iheight, iwidth * 2, output );
+ }
+
+ // Scale the frame
+ mlt_frame_rescale_yuv422( this, owidth, oheight );
+
+ // Return the output
+ *image = mlt_properties_get_data( properties, "image", NULL );
+ }
+ else
+ {
+ // Extract YUV422 and alpha
+ if ( bpp == 4 )
+ {
+ // Allocate the alpha mask
+ uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
+
+ // Convert the image and extract alpha
+ mlt_convert_rgb24a_to_yuv422( *image, owidth, oheight, owidth * 4, output, alpha );
+
+ mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
+ }
+ else
+ {
+ // No alpha to extract
+ mlt_convert_rgb24_to_yuv422( *image, owidth, oheight, owidth * 3, output );
+ }
+ }
+
+ // Now update the frame
+ mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
+ mlt_properties_set_int( properties, "width", owidth );
+ mlt_properties_set_int( properties, "height", oheight );
+
+ *image = output;
+ }
+
+ return 0;
+}
+
+/** Do it :-).
+*/
+
+static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+{
+ // Get the frame properties
+ mlt_properties properties = mlt_frame_properties( this );
+
+ // Get the filter from the stack
+ mlt_filter filter = mlt_frame_pop_service( this );
+
+ // Get the filter properties
+ mlt_properties filter_properties = mlt_filter_properties( filter );
+
+ // Get the image scaler method
+ image_scaler scaler_method = mlt_properties_get_data( filter_properties, "method", NULL );
+
+ // Correct Width/height if necessary
+ if ( *width == 0 || *height == 0 )
+ {
+ *width = mlt_properties_get_int( properties, "normalised_width" );
+ *height = mlt_properties_get_int( properties, "normalised_height" );
+ }
+
+ // There can be problems with small images - avoid them (by hacking - gah)
+ if ( *width >= 2 && *height >= 6 )
+ {
+ int iwidth = *width;
+ int iheight = *height;
+ int owidth = *width;
+ int oheight = *height;
+ char *interps = mlt_properties_get( properties, "rescale.interp" );
+
+ // Default from the scaler if not specifed on the frame
+ if ( interps == NULL )
+ {
+ interps = mlt_properties_get( mlt_filter_properties( filter ), "interpolation" );
+ mlt_properties_set( properties, "rescale.interp", interps );
+ }
+
+ // If real_width/height exist, we want that as minimum information
+ if ( mlt_properties_get_int( properties, "real_width" ) )
+ {
+ iwidth = mlt_properties_get_int( properties, "real_width" );
+ iheight = mlt_properties_get_int( properties, "real_height" );
+ }
+
+ // Let the producer know what we are actually requested to obtain
+ if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) )
+ {
+ mlt_properties_set_int( properties, "rescale_width", *width );
+ mlt_properties_set_int( properties, "rescale_height", *height );
+ }
+ else
+ {
+ // When no scaling is requested, revert the requested dimensions if possible
+ mlt_properties_set_int( properties, "rescale_width", ( iwidth / 2 ) * 2 );
+ mlt_properties_set_int( properties, "rescale_height", ( iheight / 2 ) * 2 );
+ }
+
+ // Get the image as requested
+ mlt_frame_get_image( this, image, format, &iwidth, &iheight, writable );
+
+ // Get rescale interpretation again, in case the producer wishes to override scaling
+ interps = mlt_properties_get( properties, "rescale.interp" );
+
+ if ( *image != NULL && ( *format != mlt_image_yuv422 || ( iwidth != owidth || iheight != oheight ) ) )
+ {
+ // If the colour space is correct and scaling is off, do nothing
+ if ( *format == mlt_image_yuv422 && !strcmp( interps, "none" ) )
+ {
+ *width = iwidth;
+ *height = iheight;
+ }
+ else if ( *format == mlt_image_yuv422 )
+ {
+ // Call the local scaler
+ scaler_method( this, image, *format, mlt_image_yuv422, iwidth, iheight, owidth, oheight );
+ *width = owidth;
+ *height = oheight;
+ }
+ else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
+ {
+ // Call the local scaler
+ scaler_method( this, image, *format, mlt_image_yuv422, iwidth, iheight, owidth, oheight );
+
+ // Return the output
+ *format = mlt_image_yuv422;
+ *width = owidth;
+ *height = oheight;
+ }
+ else
+ {
+ *width = iwidth;
+ *height = iheight;
+ }
+ }
+ else
+ {
+ *width = iwidth;
+ *height = iheight;
+ }
+ }
+ else
+ {
+ // Store the requested width/height
+ int iwidth = *width;
+ int iheight = *height;
+
+ // Get the image as requested
+ mlt_frame_get_image( this, image, format, &iwidth, &iheight, writable );
+
+ // Too small - for now just assign as though we got what we wanted
+ *width = iwidth;
+ *height = iheight;
+ }
+
+
+ return 0;
+}
+
+static uint8_t *producer_get_alpha_mask( mlt_frame this )
+{
+ // Obtain properties of frame
+ mlt_properties properties = mlt_frame_properties( this );
+
+ // Return the alpha mask
+ return mlt_properties_get_data( properties, "alpha", NULL );
+}
+
+/** Filter processing.
+*/
+
+static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
+{
+ // Push the filter
+ mlt_frame_push_service( frame, this );
+
+ // Push the get image method
+ mlt_frame_push_service( frame, filter_get_image );
+
+ // Set alpha call back
+ frame->get_alpha_mask = producer_get_alpha_mask;
+
+ return frame;
+}
+
+/** Constructor for the filter.
+*/
+
+mlt_filter filter_rescale_init( char *arg )
+{
+ // Create a new scaler
+ mlt_filter this = mlt_filter_new( );
+
+ // If successful, then initialise it
+ if ( this != NULL )
+ {
+ // Get the properties
+ mlt_properties properties = mlt_filter_properties( this );
+
+ // Set the process method
+ this->process = filter_process;
+
+ // Set the inerpolation
+ mlt_properties_set( properties, "interpolation", arg == NULL ? "bilinear" : arg );
+
+ // Set the method
+ mlt_properties_set_data( properties, "method", filter_scale, 0, NULL, NULL );
+ }
+
+ return this;
+}
+
projects / melted / blobdiff