static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *in, int x1, int y1, int x2, int y2) { if (x1 >= 0 && y1 >= 0) { /* XXX: here we rescale coordinate assuming they are in DVD resolution * (720x480) since we don't have anything better */ if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) { /* text rectangle defined, write the text at the center of the rectangle */ const int cx = x1 + (x2 - x1)/2; const int cy = y1 + (y2 - y1)/2; const int scaled_x = cx * (int64_t)ASS_DEFAULT_PLAYRESX / 720; const int scaled_y = cy * (int64_t)ASS_DEFAULT_PLAYRESY / 480; av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y); } else { /* only the top left corner, assume the text starts in that corner */ const int scaled_x = x1 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; const int scaled_y = y1 * (int64_t)ASS_DEFAULT_PLAYRESY / 480; av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y); } } ff_htmlmarkup_to_ass(avctx, dst, in); }