+ /* Subtitle group number */
+ put_int_as_int (buffer + 0, 1, 1);
+ /* Subtitle number */
+ put_int_as_int (buffer + 1, N, 2);
+ /* Extension block number. Use 0xff here to indicate that it is the last TTI
+ block in this subtitle "set", as we only ever use one.
+ */
+ put_int_as_int (buffer + 3, 255, 1);
+ /* Cumulative status */
+ put_int_as_int (buffer + 4, tables.cumulative_status_enum_to_file (CUMULATIVE_STATUS_NOT_CUMULATIVE), 1);
+ /* Time code in */
+ put_int_as_int (buffer + 5, i->from.hours (), 1);
+ put_int_as_int (buffer + 6, i->from.minutes (), 1);
+ put_int_as_int (buffer + 7, i->from.seconds (), 1);
+ put_int_as_int (buffer + 8, i->from.frames_at (sub::Rational (frames_per_second * 1000, 1000)), 1);
+ /* Time code out */
+ put_int_as_int (buffer + 9, i->to.hours (), 1);
+ put_int_as_int (buffer + 10, i->to.minutes (), 1);
+ put_int_as_int (buffer + 11, i->to.seconds (), 1);
+ put_int_as_int (buffer + 12, i->to.frames_at (sub::Rational (frames_per_second * 1000, 1000)), 1);
+ /* Vertical position */
+ int vp = 0;
+ if (j->vertical_position.proportional) {
+ switch (j->vertical_position.reference.get_value_or (TOP_OF_SCREEN)) {
+ case TOP_OF_SCREEN:
+ vp = rint (j->vertical_position.proportional.get() * ROWS);
+ break;
+ case CENTRE_OF_SCREEN:
+ vp = rint (j->vertical_position.proportional.get() * ROWS + (ROWS / 2.0));
+ break;
+ case BOTTOM_OF_SCREEN:
+ vp = rint (ROWS - (j->vertical_position.proportional.get() * ROWS));
+ break;
+ default:
+ break;
+ }
+ } else if (j->vertical_position.line) {
+ float const prop = float (j->vertical_position.line.get()) / j->vertical_position.lines.get ();
+ switch (j->vertical_position.reference.get_value_or (TOP_OF_SCREEN)) {
+ case TOP_OF_SCREEN:
+ vp = prop * ROWS;
+ break;
+ case CENTRE_OF_SCREEN:
+ vp = (prop + 0.5) * ROWS;
+ break;
+ case BOTTOM_OF_SCREEN:
+ vp = (1 - prop) * ROWS;
+ break;
+ default:
+ break;
+ }
+ }
+ put_int_as_int (buffer + 13, vp, 1);
+ /* Justification code */
+ /* XXX */
+ put_int_as_int (buffer + 14, tables.justification_enum_to_file (JUSTIFICATION_NONE), 1);
+ /* Comment flag */
+ put_int_as_int (buffer + 15, tables.comment_enum_to_file (COMMENT_NO), 1);
+
+ /* Text */
+ string text;
+ bool italic = false;
+ bool underline = false;
+