return ret;
}
+/** A resizing function for yuv422 frames - this does not rescale, but simply
+ resizes. It assumes yuv422 images available on the frame so use with care.
+*/
+
+uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight )
+{
+ // Get properties
+ mlt_properties properties = mlt_frame_properties( this );
+
+ // Get the input image, width and height
+ uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
+ int iwidth = mlt_properties_get_int( properties, "width" );
+ int iheight = mlt_properties_get_int( properties, "height" );
+
+ // If width and height are correct, don't do anything
+ if ( iwidth != owidth || iheight != oheight )
+ {
+ // Create the output image
+ uint8_t *output = malloc( owidth * oheight * 2 );
+
+ // Calculate strides
+ int istride = iwidth * 2;
+ int ostride = owidth * 2;
+
+ // Coordinates (0,0 is middle of output)
+ int y, x;
+
+ // Calculate ranges
+ int out_x_range = owidth / 2;
+ int out_y_range = oheight / 2;
+ int in_x_range = iwidth / 2;
+ int in_y_range = iheight / 2;
+
+ // Output pointers
+ uint8_t *out_line = output;
+ uint8_t *out_ptr;
+
+ // Calculate a middle and possibly invalid pointer in the input
+ uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
+ int in_line = - out_y_range * istride - out_x_range * 2;
+ int in_ptr;
+
+ // Loop for the entirety of our output height.
+ for ( y = - out_y_range; y < out_y_range ; y ++ )
+ {
+ // Start at the beginning of the line
+ out_ptr = out_line;
+
+ // Point the start of the current input line (NB: can be out of range)
+ in_ptr = in_line;
+
+ // Loop for the entirety of our output row.
+ for ( x = - out_x_range; x < out_x_range; x ++ )
+ {
+ // Check if x and y are in the valid input range.
+ if ( abs( x ) < in_x_range && abs( y ) < in_y_range )
+ {
+ // We're in the input range for this row.
+ *out_ptr ++ = *( in_middle + in_ptr ++ );
+ *out_ptr ++ = *( in_middle + in_ptr ++ );
+ }
+ else
+ {
+ // We're not in the input range for this row.
+ *out_ptr ++ = 16;
+ *out_ptr ++ = 128;
+ in_ptr += 2;
+ }
+ }
+
+ // Move to next output line
+ out_line += ostride;
+
+ // Move to next input line
+ in_line += istride;
+ }
+
+ // Now update the frame
+ mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
+ mlt_properties_set_int( properties, "width", owidth );
+ mlt_properties_set_int( properties, "height", oheight );
+
+ // Return the output
+ return output;
+ }
+
+ // No change, return input
+ return input;
+}
+
+/** A rescaling function for yuv422 frames - low quality, and provided for testing
+ only. It assumes yuv422 images available on the frame so use with care.
+*/
+
+uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
+{
+ // Get properties
+ mlt_properties properties = mlt_frame_properties( this );
+
+ // Get the input image, width and height
+ uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
+ int iwidth = mlt_properties_get_int( properties, "width" );
+ int iheight = mlt_properties_get_int( properties, "height" );
+
+ // If width and height are correct, don't do anything
+ if ( iwidth != owidth || iheight != oheight )
+ {
+ // Create the output image
+ uint8_t *output = malloc( owidth * oheight * 2 );
+
+ // Calculate strides
+ int istride = iwidth * 2;
+ int ostride = owidth * 2;
+
+ // Coordinates (0,0 is middle of output)
+ int y, x;
+
+ // Derived coordinates
+ int dy, dx;
+
+ // Calculate ranges
+ int out_x_range = owidth / 2;
+ int out_y_range = oheight / 2;
+ int in_x_range = iwidth / 2;
+ int in_y_range = iheight / 2;
+
+ // Output pointers
+ uint8_t *out_line = output;
+ uint8_t *out_ptr;
+
+ // Calculate a middle pointer
+ uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
+ uint8_t *in_line;
+ uint8_t *in_ptr;
+
+ // Generate the affine transform scaling values
+ float scale_width = ( float )iwidth / ( float )owidth;
+ float scale_height = ( float )iheight / ( float )oheight;
+
+ // Loop for the entirety of our output height.
+ for ( y = - out_y_range; y < out_y_range ; y ++ )
+ {
+ // Calculate the derived y value
+ dy = scale_height * y;
+
+ // Start at the beginning of the line
+ out_ptr = out_line;
+
+ // Pointer to the middle of the input line
+ in_line = in_middle + dy * istride;
+
+ // Loop for the entirety of our output row.
+ for ( x = - out_x_range; x < out_x_range; x += 2 )
+ {
+ // Calculated the derived x
+ dx = scale_width * x;
+
+ // Check if x and y are in the valid input range.
+ if ( abs( dx ) < in_x_range && abs( dy ) < in_y_range )
+ {
+ // We're in the input range for this row.
+ in_ptr = in_line + ( dx >> 1 ) * 4;
+ *out_ptr ++ = *in_ptr ++;
+ *out_ptr ++ = *in_ptr ++;
+ *out_ptr ++ = *in_ptr ++;
+ *out_ptr ++ = *in_ptr ++;
+ }
+ else
+ {
+ // We're not in the input range for this row.
+ *out_ptr ++ = 16;
+ *out_ptr ++ = 128;
+ *out_ptr ++ = 16;
+ *out_ptr ++ = 128;
+ }
+ }
+
+ // Move to next output line
+ out_line += ostride;
+ }
+
+ // Now update the frame
+ mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
+ mlt_properties_set_int( properties, "width", owidth );
+ mlt_properties_set_int( properties, "height", oheight );
+
+ // Return the output
+ return output;
+ }
+
+ // No change, return input
+ return input;
+}
+
projects / melted / blobdiff