forked from mia/Aegisub
330 lines
9 KiB
Text
330 lines
9 KiB
Text
Automation 4 Subtitle Data format and functions API
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This file describes the API for retrieving and manipulating subtitle data in
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Automation 4, as well as the data structures generated and accepted by these
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APIs.
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---
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Subtitle Line table
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A Subtitle Line table contains various information about a line in the
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subtitle file being processed. There are several classes of subtitle lines,
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which all have a few fields in common, but otherwise have different fields.
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Common keys for all Subtitle Line classes:
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class (string)
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The class of the Subtitle Line. Must be one of:
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"clear", (empty line)
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"comment", (semicolon-style comment line)
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"head", (section heading)
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"info", (key/value pair in Script Info section)
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"format", (line format definition)
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"style", (style definition line)
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"stylex", (style extension line, tentative AS5 feature)
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"dialogue", (dialogue line or dialogue-style comment line)
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"unknown" (unknown kind of line)
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Lines of the "unknown" class should never appear in well-formed subtitle
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scripts. They will usually be a result of a line being outside the section
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it belongs in.
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raw (string)
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The raw text of the line.
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You should not change this field directly, since the data in it will never
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be used for generating lines in internal representation. It will, however,
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be updated from the remaining data in the line whenever it is required for
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one thing or another by an internal function.
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section (string)
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The section this line is placed in. If it is placed before the first section
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heading, this field is nil.
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Key defined only for the "comment" class:
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text (string)
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The text of the comment line, ie. everything after the initial semicolon,
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including any spaces.
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Key defined only for the "head" class:
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No special keys are defined for this class, but the "section" field will be
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the name of the new section started.
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Keys defined only for the "info" class:
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key (string)
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The "key" part of the line, ie. everything before the first colon.
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value (string)
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The "value" part of the line, ie. everything after the first colon,
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discarding any leading whitespace.
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Keys defined only for the "format" class:
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fields (table)
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An Array Table of strings, each being the name of a field on the line.
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Keys defined only for the "style" class:
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name (string)
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Name of the style.
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fontname (string)
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Name of the font used.
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fontsize (number)
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Size of the font used, in pixels.
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color1 (string)
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color2 (string)
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color3 (string)
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color4 (string)
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The four colors for the style. (Fill, pre-karaoke fill, border, shadow)
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In VB hexadecimal, ie. "&HAABBGGRR&"
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bold (boolean/number)
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The boldness/weight of the font. This will usually be a boolean, but it
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can be a number, in which case it must be one of 0, 100, 200, ..., 900.
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italic (boolean)
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underline (boolean)
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strikeout (boolean)
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Other properties of the font.
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scale_x (number)
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scale_y (number)
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Scaling of the text, in percent.
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spacing (number)
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Additional spacing between letters. Always integer.
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angle (number)
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Rotation of the text on the Z axis in degrees.
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borderstyle (number)
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1 = outline and drop shadow; 3 = opaque box.
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outline (number)
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Width of the outline.
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shadow (number)
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Distance between shadow and text.
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align (number)
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Numpad alignment of the text.
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margin_l (number)
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margin_r (number)
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margin_t (number)
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margin_b (number)
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Left/right/top/bottom margins of the text in pixels.
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If using a format without support for separate top and bottom margins, the
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margin_t value will be used for vertical margin when converting back to
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textual representation.
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encoding (number)
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Font encoding used for text. This follows the MS Windows font encoding
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constants.
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relative_to (number)
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From STS.h: "0: window, 1: video, 2: undefined (~window)"
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vertical (boolean)
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Whether vertical text semantics is used or not. (Tentative AS5 field.)
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Keys defined only for the "stylex" class:
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Remember that this class is only for the tentative AS5 format.
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name (string)
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Name of the new style defined.
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basename (string)
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Name of the style the new style is based on.
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overrides (string)
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String of override tags defining the new style.
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Keys only defined for the "dialogue" class:
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comment (boolean)
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True if the line is a comment line, otherwise false.
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layer (number)
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The layer the line is rendered in.
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start_time (number)
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end_time (number)
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Start/end time of the line in milliseconds.
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style (string)
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Name of the style assigned to this line.
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actor (string)
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Name of the actor performing this line.
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margin_l (number)
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margin_r (number)
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margin_t (number)
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margin_b (number)
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Left/right/top/bottom margins of the text in pixels.
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If any of these are zero, it's considered "not overriding".
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Same comment as for style lines applies.
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effect (string)
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Effect to apply to the line.
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userdata (string)
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Authoring-application defined data. (Tentative AS5 field.)
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text (string)
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The text for this line.
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---
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Subtitle File user data object
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The Subtitle File object is a user data object with some of the metatable
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methods overridden to provide table-like access to the subtitle lines, as
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well as some functions to modify the subtitles.
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The following operations are supported.
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n = #subs
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n = subs.n
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Retrieve the number of lines in total.
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The first syntax is preferred.
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line = subs[i]
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Retrieve line i, assuming 1 <= i <= n.
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subs[i] = line
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Replace line i with new data.
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subs[i] = nil
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subs.delete(i[, i2, ...])
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Delete line i, pushing all following lines up an index. (Ie. by repeatedly
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deleting line 1 this way, the file will eventually end up empty.)
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The function syntax for this function can also take multiple line indexes,
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in which case it deletes each of those lines. All indexes are relative to
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the line numbering before the function is called.
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subs.deleterange(a, b)
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Deletes all lines from index a to index b, both inclusive. If b < a,
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nothing is done.
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subs[0] = line
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subs.append(line[, line2, ...])
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Append one or more lines to a file.
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subs[-i] = line
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subs.insert(i, line[, line2, ...])
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Insert one or more lines before index i.
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Effeciency concerns
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Internally in Aegisub the subtitles are stored in a linked list, meaning
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random access runs in O(n) time rather than O(1), as the interface presented
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here could make it seem like.
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Internally, a cursor to the last accessed item is kept, to make sequential or
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mostly-sequential access to items faster, but totally random access will
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still be somewhat ineffecient. Accessing items near the start or end of the
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subtitle file can also be done reasonably fast however.
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After an item-by-item deletion, the cursor will be placed at the item that
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now has the lowest id specified for the operation.
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After a range deletion operation, the cursor will be placed at the item
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that now has the first id in the range of the operation.
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After an insert operation, the cursor will be placed after the last inserted
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item.
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An append operation does not move the cursor.
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---
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Parsing karaoke data
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Tihs function uses the Aegisub SSA parser to split a string into karaoke
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syllables with additional calculated information added.
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function aegisub.parse_karaoke_data(text)
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@text (string)
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The SSA-format string to parse.
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Returns: A Parsed Karaoke Data table.
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---
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Parsed Karaoke Data table
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The Parsed Karaoke Data table is simply an Array Table of Karaoke Syllable
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Data tables. However, the Parsed Karaoke Data table will always have one more
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item than its count shows, which is numbered 0 (zero). This item contains
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everything before the first syllable.
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Karaoke Syllable Data table
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This table contains information about a single karaoke syllable.
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duration (number)
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Duration of the syllable in milliseconds.
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(In case of syllable zero, this is always zero. Also zero for "kt" tags.)
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start_time (number)
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end_time (number)
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Start and end times of the syllable, relative to the start of the line,
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given in milliseconds.
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(While these can technically easily be calculated from the duration data,
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they are too convenient to leave out from the standard interface.)
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tag (string)
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The tag used for marking up this syllable. Usually one of:
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"k", "K", "kf", "ko", "kt"
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(In case of syllable zero, this is always the empty string.)
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text (string)
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The text of the syllable, including all additional override tags.
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text_stripped (string)
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The text of the syllable, stripped of any override tags.
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---
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Setting undo points
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This function can only be used in macro features, it will have no effect when
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used in any other feature.
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It sets an undo point.
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You should always call this function after every operation that must be
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undoable as a separate step. It is considered very bad practice to modify
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the subtitles in a macro without setting at least one undo-point, which must
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be at the end.
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An undo step can consist of any number of subtitle operations. (Ie. inserting,
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deleting and replacing subtitle file lines.)
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Furthermore, this function also marks the subtitles as "modified". No other
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function does this.
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function aegisub.set_undo_point(description)
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@description (string)
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A short description of the operation that will be undone, if this undo-point
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is used.
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Returns: nothing.
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---
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