+ /* Figure out what width the source would display at. */
+ int source_display_width = cropped_width * (double)pixel_aspect_width /
+ (double)pixel_aspect_height ;
+
+ /*
+ 3 different ways of deciding output dimensions:
+ - 1: Strict anamorphic, preserve source dimensions
+ - 2: Loose anamorphic, round to mod16 and preserve storage aspect ratio
+ - 3: Power user anamorphic, specify everything
+ */
+ int width, height;
+ switch( job->anamorphic.mode )
+ {
+ case 1:
+ /* Strict anamorphic */
+ *output_width = cropped_width;
+ *output_height = cropped_height;
+ *output_par_width = title->pixel_aspect_width;
+ *output_par_height = title->pixel_aspect_height;
+ break;
+
+ case 2:
+ /* "Loose" anamorphic.
+ - Uses mod16-compliant dimensions,
+ - Allows users to set the width
+ */
+ width = job->width;
+ // height: Gets set later, ignore user job->height value
+
+ /* Gotta handle bounding dimensions.
+ If the width is too big, just reset it with no rescaling.
+ Instead of using the aspect-scaled job height,
+ we need to see if the job width divided by the storage aspect
+ is bigger than the max. If so, set it to the max (this is sloppy).
+ If not, set job height to job width divided by storage aspect.
+ */
+
+ if ( job->maxWidth && (job->maxWidth < job->width) )
+ width = job->maxWidth;
+
+ /* Time to get picture width that divide cleanly.*/
+ width = MULTIPLE_MOD( width, mod);
+
+ /* Verify these new dimensions don't violate max height and width settings */
+ if ( job->maxWidth && (job->maxWidth < job->width) )
+ width = job->maxWidth;
+
+ height = ((double)width / storage_aspect) + 0.5;
+
+ if ( job->maxHeight && (job->maxHeight < height) )
+ height = job->maxHeight;
+
+ /* Time to get picture height that divide cleanly.*/
+ height = MULTIPLE_MOD( height, mod);
+
+ /* Verify these new dimensions don't violate max height and width settings */
+ if ( job->maxHeight && (job->maxHeight < height) )
+ height = job->maxHeight;
+
+ /* The film AR is the source's display width / cropped source height.
+ The output display width is the output height * film AR.
+ The output PAR is the output display width / output storage width. */
+ pixel_aspect_width = height * source_display_width / cropped_height;
+ pixel_aspect_height = width;
+
+ /* Pass the results back to the caller */
+ *output_width = width;
+ *output_height = height;
+ break;
+
+ case 3:
+ /* Anamorphic 3: Power User Jamboree
+ - Set everything based on specified values */
+
+ /* Use specified storage dimensions */
+ width = job->width;
+ height = job->height;
+
+ /* Bind to max dimensions */
+ if( job->maxWidth && width > job->maxWidth )
+ width = job->maxWidth;
+ if( job->maxHeight && height > job->maxHeight )
+ height = job->maxHeight;
+
+ /* Time to get picture dimensions that divide cleanly.*/
+ width = MULTIPLE_MOD( width, mod);
+ height = MULTIPLE_MOD( height, mod);
+
+ /* Verify we're still within max dimensions */
+ if( job->maxWidth && width > job->maxWidth )
+ width = job->maxWidth - (mod/2);
+ if( job->maxHeight && height > job->maxHeight )
+ height = job->maxHeight - (mod/2);
+
+ /* Re-ensure we have picture dimensions that divide cleanly. */
+ width = MULTIPLE_MOD( width, mod );
+ height = MULTIPLE_MOD( height, mod );
+
+ /* That finishes the storage dimensions. On to display. */
+ if( job->anamorphic.dar_width && job->anamorphic.dar_height )
+ {
+ /* We need to adjust the PAR to produce this aspect. */
+ pixel_aspect_width = height * job->anamorphic.dar_width / job->anamorphic.dar_height;
+ pixel_aspect_height = width;
+ }
+ else
+ {
+ /* If we're doing ana 3 and not specifying a DAR, care needs to be taken.
+ This indicates a PAR is potentially being set by the interface. But
+ this is an output PAR, to correct a source, and it should not be assumed
+ that it properly creates a display aspect ratio when applied to the source,
+ which could easily be stored in a different resolution. */
+ if( job->anamorphic.keep_display_aspect )
+ {
+ /* We can ignore the possibility of a PAR change */
+ pixel_aspect_width = height * ( (double)source_display_width / (double)cropped_height );
+ pixel_aspect_height = width;
+ }
+ else
+ {
+ int output_display_width = width * (double)pixel_aspect_width /
+ (double)pixel_aspect_height;
+ pixel_aspect_width = output_display_width;
+ pixel_aspect_height = width;
+ }
+ }
+
+ /* Back to caller */
+ *output_width = width;
+ *output_height = height;
+ break;
+ }
+
+ /* While x264 is smart enough to reduce fractions on its own, libavcodec
+ needs some help with the math, so lose superfluous factors. */
+ hb_reduce( output_par_width, output_par_height,
+ pixel_aspect_width, pixel_aspect_height );