/
sub_station_alpha.go
338 lines (310 loc) · 10.4 KB
/
sub_station_alpha.go
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/*
This file implements writing the Sub Station Alpha file format (*.ssa).
It can generate SubRip content from a model.
Format specifications:
https://en.wikipedia.org/wiki/SubStation_Alpha
http://www.matroska.org/technical/specs/subtitles/ssa.html
http://moodub.free.fr/video/ass-specs.doc
An example SSA file:
[Script Info]
; This is a Sub Station Alpha v4 script.
; For Sub Station Alpha info and downloads,
; go to http://www.eswat.demon.co.uk/
Title: Neon Genesis Evangelion - Episode 26 (neutral Spanish)
Original Script: RoRo
Script Updated By: version 2.8.01
ScriptType: v4.00
Collisions: Normal
PlayResY: 600
PlayDepth: 0
Timer: 100,0000
[V4 Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow,
Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding
Style: DefaultVCD, Arial,28,11861244,11861244,11861244,-2147483640,-1,0,1,1,2,2,30,30,30,0,0
[Events]
Format: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: Marked=0,0:00:01.18,0:00:06.85,DefaultVCD, NTP,0000,0000,0000,,{\pos(400,570)}Like an angel with pity on nobody
*/
package srtgears
import (
"io"
"os"
"strconv"
"strings"
"time"
)
// Mapping between our model Pos to *.ssa Alignment
var modelPosToSsaPos = map[Pos]int{
TopLeft: 5, Top: 6, TopRight: 7,
Left: 9, Center: 10, Right: 11,
BottomLeft: 1, Bottom: 2, BottomRight: 3,
}
// WriteSsaFile generates Sub Station Alpha format (*.ssa) and writes it to a file.
func WriteSsaFile(name string, sp *SubsPack) (err error) {
f, err := os.Create(name)
if err != nil {
return
}
defer f.Close()
debugf("Writing %d subtitles to file: %s", len(sp.Subs), name)
return WriteSsaTo(f, sp)
}
// Info that determines a style. Contains the final format that goes into the SSA file.
type styleKey struct {
Pos int // Subtitle position
Color int // Subtitle color, in BBGGRR format
}
// keyFromSub creates a style key containing the style info of the subtitle.
func keyFromSub(s *Subtitle) (k styleKey) {
pos := s.Pos
if pos == PosNotSpecified {
pos = Bottom // Assign default position
}
k.Pos = modelPosToSsaPos[pos]
color := s.Color
for {
if color == "" {
// Unknown / unspecified color, assign a default value
k.Color = 0xefefef // light gray
break
}
if color[0] == '#' {
color = color[1:]
}
// Try hex form
if n, err := strconv.ParseInt(color, 16, 64); err == nil {
// It's a hex form (RRGGBB). Switch bytes.
v := int(n)
k.Color = (v & 0xff0000) >> 16
k.Color |= v & 0x00ff00
k.Color |= v & 0x0000ff << 16
break
}
// Not a hex form, try the standard color names
color = htmlColorRGB[strings.ToLower(color)] // If unknown, will be "" and handled in next iteration
}
return
}
// WriteSsaTo generates Sub Station Alpha format (*.ssa) and writes it to an io.Writer.
func WriteSsaTo(w io.Writer, sp *SubsPack) (err error) {
wr := &writer{w: w}
// BOM
wr.pr("\xef\xbb\xbf")
// Script Info section
wr.prn("[Script Info]") // This must be the first line
wr.prn("; This is a Sub Station Alpha v4 script.")
wr.prn("; ", HomePage)
wr.prn("Title: ")
wr.prn("Script Updated By: Srtgears")
wr.prn("ScriptType: v4.00")
wr.prn("Collisions: Normal")
wr.prn("PlayResY: 600")
wr.prn("PlayDepth: 0")
wr.prn("Timer: 100,0000")
// Styles section
wr.prn()
wr.prn("[V4 Styles]")
wr.prn("Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding")
// Loop over all subtitles to determine what styles we have
styleKeys := make([]styleKey, len(sp.Subs)) // Store calculated style keys, we will need to interate over subs once more
stylesMap := map[styleKey]string{} // Unique style keys
styles := []styleKey{} // Maintain order of unique style keys for generation
for i, s := range sp.Subs {
styleKeys[i] = keyFromSub(s)
if _, ok := stylesMap[styleKeys[i]]; !ok {
// new style
styles = append(styles, styleKeys[i])
stylesMap[styleKeys[i]] = strconv.Itoa(len(styles))
}
}
// Now generate style definitions
for _, v := range styles {
wr.prf("Style: %s, Arial,28,%d,%d,%d,-2147483640,-1,0,1,1,2,%d,30,30,30,0,0",
stylesMap[v], v.Color, v.Color, v.Color, v.Pos)
wr.prn()
}
// Events section
wr.prn()
wr.prn("[Events]")
wr.prn("Format: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text")
printTime := func(t time.Duration) {
hour := t / time.Hour
min := (t % time.Hour) / time.Minute
sec := (t % time.Minute) / time.Second
ms := (t % time.Second) / time.Millisecond
wr.prf("%d:%02d:%02d.%02d", hour, min, sec, ms/10)
}
for i, s := range sp.Subs {
if wr.err != nil {
break
}
wr.pr("Dialogue: Marked=0,")
printTime(s.TimeIn)
wr.pr(",")
printTime(s.TimeOut)
wr.pr(",", stylesMap[styleKeys[i]], ",NA,0000,0000,0000,,")
// Texts
for i, line := range s.Lines {
// Note: HTML and controls not need to be removed (they are handled by video players)
wr.pr(line)
if i != len(s.Lines)-1 {
wr.pr(`\n`)
}
}
wr.prn()
}
return wr.err
}
// HTML color names and their RGB codes. SSA does not support color names.
// Src: http://www.w3schools.com/html/html_colornames.asp
var htmlColorRGB = map[string]string{
"aliceblue": "F0F8FF",
"antiquewhite": "FAEBD7",
"aqua": "00FFFF",
"aquamarine": "7FFFD4",
"azure": "F0FFFF",
"beige": "F5F5DC",
"bisque": "FFE4C4",
"black": "000000",
"blanchedalmond": "FFEBCD",
"blue": "0000FF",
"blueviolet": "8A2BE2",
"brown": "A52A2A",
"burlywood": "DEB887",
"cadetblue": "5F9EA0",
"chartreuse": "7FFF00",
"chocolate": "D2691E",
"coral": "FF7F50",
"cornflowerblue": "6495ED",
"cornsilk": "FFF8DC",
"crimson": "DC143C",
"cyan": "00FFFF",
"darkblue": "00008B",
"darkcyan": "008B8B",
"darkgoldenrod": "B8860B",
"darkgray": "A9A9A9",
"darkgrey": "A9A9A9",
"darkgreen": "006400",
"darkkhaki": "BDB76B",
"darkmagenta": "8B008B",
"darkolivegreen": "556B2F",
"darkorange": "FF8C00",
"darkorchid": "9932CC",
"darkred": "8B0000",
"darksalmon": "E9967A",
"darkseagreen": "8FBC8F",
"darkslateblue": "483D8B",
"darkslategray": "2F4F4F",
"darkslategrey": "2F4F4F",
"darkturquoise": "00CED1",
"darkviolet": "9400D3",
"deeppink": "FF1493",
"deepskyblue": "00BFFF",
"dimgray": "696969",
"dimgrey": "696969",
"dodgerblue": "1E90FF",
"firebrick": "B22222",
"floralwhite": "FFFAF0",
"forestgreen": "228B22",
"fuchsia": "FF00FF",
"gainsboro": "DCDCDC",
"ghostwhite": "F8F8FF",
"gold": "FFD700",
"goldenrod": "DAA520",
"gray": "808080",
"grey": "808080",
"green": "008000",
"greenyellow": "ADFF2F",
"honeydew": "F0FFF0",
"hotpink": "FF69B4",
"indianred": "CD5C5C",
"indigo": "4B0082",
"ivory": "FFFFF0",
"khaki": "F0E68C",
"lavender": "E6E6FA",
"lavenderblush": "FFF0F5",
"lawngreen": "7CFC00",
"lemonchiffon": "FFFACD",
"lightblue": "ADD8E6",
"lightcoral": "F08080",
"lightcyan": "E0FFFF",
"lightgoldenrodyellow": "FAFAD2",
"lightgray": "D3D3D3",
"lightgrey": "D3D3D3",
"lightgreen": "90EE90",
"lightpink": "FFB6C1",
"lightsalmon": "FFA07A",
"lightseagreen": "20B2AA",
"lightskyBlue": "87CEFA",
"lightslategray": "778899",
"lightslategrey": "778899",
"lightsteelBlue": "B0C4DE",
"lightyellow": "FFFFE0",
"lime": "00FF00",
"limegreen": "32CD32",
"linen": "FAF0E6",
"magenta": "FF00FF",
"maroon": "800000",
"mediumaquamarine": "66CDAA",
"mediumblue": "0000CD",
"mediumorchid": "BA55D3",
"mediumpurple": "9370DB",
"mediumseagreen": "3CB371",
"mediumslateblue": "7B68EE",
"mediumspringgreen": "00FA9A",
"mediumturquoise": "48D1CC",
"mediumvioletred": "C71585",
"midnightblue": "191970",
"mintcream": "F5FFFA",
"mistyrose": "FFE4E1",
"moccasin": "FFE4B5",
"navajowhite": "FFDEAD",
"navy": "000080",
"oldlace": "FDF5E6",
"olive": "808000",
"olivedrab": "6B8E23",
"orange": "FFA500",
"orangered": "FF4500",
"orchid": "DA70D6",
"palegoldenrod": "EEE8AA",
"palegreen": "98FB98",
"paleturquoise": "AFEEEE",
"palevioletred": "DB7093",
"papayawhip": "FFEFD5",
"peachpuff": "FFDAB9",
"peru": "CD853F",
"pink": "FFC0CB",
"plum": "DDA0DD",
"powderblue": "B0E0E6",
"purple": "800080",
"rebeccapurple": "663399",
"red": "FF0000",
"rosybrown": "BC8F8F",
"royalblue": "4169E1",
"saddlebrown": "8B4513",
"salmon": "FA8072",
"sandybrown": "F4A460",
"seagreen": "2E8B57",
"seashell": "FFF5EE",
"sienna": "A0522D",
"silver": "C0C0C0",
"skyblue": "87CEEB",
"slateblue": "6A5ACD",
"slategray": "708090",
"slategrey": "708090",
"snow": "FFFAFA",
"springgreen": "00FF7F",
"steelblue": "4682B4",
"tan": "D2B48C",
"teal": "008080",
"thistle": "D8BFD8",
"tomato": "FF6347",
"turquoise": "40E0D0",
"violet": "EE82EE",
"wheat": "F5DEB3",
"white": "FFFFFF",
"whitesmoke": "F5F5F5",
"yellow": "FFFF00",
"yellowgreen": "9ACD32",
}