mirror of
https://github.com/SubtitleEdit/subtitleedit.git
synced 2024-10-28 06:52:35 +01:00
349 lines
13 KiB
C#
349 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace Nikse.SubtitleEdit.Core.SubtitleFormats
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{
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/// <summary>
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/// http://www.whatwg.org/specs/web-apps/current-work/webvtt.html
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/// </summary>
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public class WebVTT : SubtitleFormat
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{
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private static readonly Regex RegexTimeCodes = new Regex(@"^-?\d+:-?\d+:-?\d+\.-?\d+\s*-->\s*-?\d+:-?\d+:-?\d+\.-?\d+", RegexOptions.Compiled);
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private static readonly Regex RegexTimeCodesMiddle = new Regex(@"^-?\d+:-?\d+\.-?\d+\s*-->\s*-?\d+:-?\d+:-?\d+\.-?\d+", RegexOptions.Compiled);
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private static readonly Regex RegexTimeCodesShort = new Regex(@"^-?\d+:-?\d+\.-?\d+\s*-->\s*-?\d+:-?\d+\.-?\d+", RegexOptions.Compiled);
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public override string Extension => ".vtt";
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public override string Name => "WebVTT";
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public override string ToText(Subtitle subtitle, string title)
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{
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const string timeCodeFormatHours = "{0:00}:{1:00}:{2:00}.{3:000}"; // hh:mm:ss.mmm
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const string paragraphWriteFormat = "{0} --> {1}{2}{5}{3}{4}{5}";
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var sb = new StringBuilder();
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sb.AppendLine("WEBVTT");
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sb.AppendLine();
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foreach (Paragraph p in subtitle.Paragraphs)
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{
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string start = string.Format(timeCodeFormatHours, p.StartTime.Hours, p.StartTime.Minutes, p.StartTime.Seconds, p.StartTime.Milliseconds);
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string end = string.Format(timeCodeFormatHours, p.EndTime.Hours, p.EndTime.Minutes, p.EndTime.Seconds, p.EndTime.Milliseconds);
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string positionInfo = GetPositionInfoFromAssTag(p);
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string style = string.Empty;
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if (!string.IsNullOrEmpty(p.Extra) && subtitle.Header == "WEBVTT")
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style = p.Extra;
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sb.AppendLine(string.Format(paragraphWriteFormat, start, end, positionInfo, FormatText(p), style, Environment.NewLine));
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}
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return sb.ToString().Trim();
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}
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internal static string GetPositionInfoFromAssTag(Paragraph p)
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{
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string positionInfo = string.Empty;
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if (p.Text.StartsWith("{\\a", StringComparison.Ordinal))
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{
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string position = null; // horizontal
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if (p.Text.StartsWith("{\\an1}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an4}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an7}", StringComparison.Ordinal)) // advanced sub station alpha
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{
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position = "20%"; //left
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}
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else if (p.Text.StartsWith("{\\an3}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an6}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an9}", StringComparison.Ordinal)) // advanced sub station alpha
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{
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position = "80%"; //right
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}
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string line = null;
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if (p.Text.StartsWith("{\\an7}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an8}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an9}", StringComparison.Ordinal)) // advanced sub station alpha
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{
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line = "20%"; //top
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}
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else if (p.Text.StartsWith("{\\an4}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an5}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an6}", StringComparison.Ordinal)) // advanced sub station alpha
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{
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line = "50%"; //middle
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}
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if (!string.IsNullOrEmpty(position))
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{
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positionInfo = " position:" + position;
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}
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if (!string.IsNullOrEmpty(line))
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{
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if (positionInfo == null)
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positionInfo = " line:" + line;
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else
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positionInfo = positionInfo += " line:" + line;
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}
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}
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return positionInfo;
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}
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internal static string FormatText(Paragraph p)
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{
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string text = Utilities.RemoveSsaTags(p.Text);
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while (text.Contains(Environment.NewLine + Environment.NewLine))
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text = text.Replace(Environment.NewLine + Environment.NewLine, Environment.NewLine);
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return text;
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}
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public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
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{
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_errorCount = 0;
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Paragraph p = null;
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bool textDone = true;
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string positionInfo = string.Empty;
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foreach (string line in lines)
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{
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string s = line;
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bool isTimeCode = line.Contains("-->");
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if (isTimeCode && RegexTimeCodesMiddle.IsMatch(s))
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{
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s = "00:" + s; // start is without hours, end is with hours
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}
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if (isTimeCode && RegexTimeCodesShort.IsMatch(s))
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{
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s = "00:" + s.Replace("--> ", "--> 00:");
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}
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if (isTimeCode && RegexTimeCodes.IsMatch(s))
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{
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textDone = false;
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if (p != null)
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{
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subtitle.Paragraphs.Add(p);
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p = null;
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}
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try
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{
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string[] parts = s.Replace("-->", "@").Split(new[] { '@' }, StringSplitOptions.RemoveEmptyEntries);
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p = new Paragraph();
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p.StartTime = GetTimeCodeFromString(parts[0]);
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p.EndTime = GetTimeCodeFromString(parts[1]);
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positionInfo = GetPositionInfo(s);
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}
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catch (Exception exception)
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{
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System.Diagnostics.Debug.WriteLine(exception.Message);
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_errorCount++;
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p = null;
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}
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}
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else if (subtitle.Paragraphs.Count == 0 && line.Trim() == "WEBVTT")
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{
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subtitle.Header = "WEBVTT";
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}
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else if (p != null && !string.IsNullOrWhiteSpace(line))
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{
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string text = positionInfo + line.Trim();
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if (!textDone)
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p.Text = (p.Text + Environment.NewLine + text).Trim();
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positionInfo = string.Empty;
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}
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else if (line.Length == 0)
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{
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textDone = true;
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}
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}
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if (p != null)
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subtitle.Paragraphs.Add(p);
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subtitle.Renumber();
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}
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internal static string GetPositionInfo(string s)
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{
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//position: x --- 0% = left, 100%=right (horizontal)
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//line: x --- 0 or -16 or 0%=top, 16 or -1 or 100% = bottom (vertical)
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var pos = GetTag(s, "position:");
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var line = GetTag(s, "line:");
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var positionInfo = string.Empty;
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bool hAlignLeft = false;
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bool hAlignRight = false;
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bool vAlignTop = false;
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bool vAlignMiddle = false;
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if (!string.IsNullOrEmpty(pos) && pos.EndsWith('%'))
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{
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double number;
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if (double.TryParse(pos.TrimEnd('%'), out number))
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{
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if (number < 25)
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{
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hAlignLeft = true;
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}
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else if (number > 75)
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{
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hAlignRight = true;
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}
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}
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}
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if (!string.IsNullOrEmpty(line) && line.EndsWith('%'))
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{
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if (line.EndsWith('%'))
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{
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double number;
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if (double.TryParse(line.TrimEnd('%'), out number))
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{
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if (number < 25)
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{
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vAlignTop = true;
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}
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else if (number < 75)
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{
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vAlignMiddle = true;
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}
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}
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}
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else
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{
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double number;
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if (double.TryParse(line.TrimEnd('%'), out number))
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{
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if (number < 7)
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{
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vAlignTop = true;
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}
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else if (number < 11)
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{
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vAlignMiddle = true;
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}
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}
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}
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}
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if (hAlignLeft)
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{
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if (vAlignTop)
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{
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return "{\\an7}";
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}
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if (vAlignMiddle)
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{
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return "{\\an4}";
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}
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return "{\\an1}";
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}
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else if (hAlignRight)
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{
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if (vAlignTop)
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{
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return "{\\an9}";
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}
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if (vAlignMiddle)
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{
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return "{\\an6}";
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}
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return "{\\an3}";
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}
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else if (vAlignTop)
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{
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return "{\\an8}";
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}
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else if (vAlignMiddle)
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{
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return "{\\an5}";
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}
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return positionInfo;
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}
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private static string GetTag(string s, string tag)
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{
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var pos = s.IndexOf(tag, StringComparison.Ordinal);
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if (pos >= 0)
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{
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var v = s.Substring(pos + tag.Length).Trim();
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var end = v.IndexOf("%,", StringComparison.Ordinal);
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if (end >= 0)
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{
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v = v.Remove(end + 1);
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}
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end = v.IndexOf(' ');
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if (end >= 0)
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{
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v = v.Remove(end);
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}
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return v;
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}
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return null;
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}
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public override void RemoveNativeFormatting(Subtitle subtitle, SubtitleFormat newFormat)
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{
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foreach (Paragraph p in subtitle.Paragraphs)
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{
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if (p.Text.Contains('<'))
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{
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string text = p.Text;
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text = RemoveTag("v", text);
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text = RemoveTag("rt", text);
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text = RemoveTag("ruby", text);
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text = RemoveTag("c", text);
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p.Text = RemoveTag("span", text);
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}
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}
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}
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public static List<string> GetVoices(Subtitle subtitle)
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{
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var list = new List<string>();
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if (subtitle != null && subtitle.Paragraphs != null)
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{
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foreach (Paragraph p in subtitle.Paragraphs)
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{
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string s = p.Text;
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var startIndex = s.IndexOf("<v ", StringComparison.Ordinal);
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while (startIndex >= 0)
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{
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int endIndex = s.IndexOf('>', startIndex);
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if (endIndex > startIndex)
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{
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string voice = s.Substring(startIndex + 2, endIndex - startIndex - 2).Trim();
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if (!list.Contains(voice))
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list.Add(voice);
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}
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if (startIndex == s.Length - 1)
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startIndex = -1;
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else
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startIndex = s.IndexOf("<v ", startIndex + 1, StringComparison.Ordinal);
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}
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}
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}
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return list;
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}
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public static string RemoveTag(string tag, string text)
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{
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int indexOfTag = text.IndexOf("<" + tag + " ", StringComparison.Ordinal);
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if (indexOfTag >= 0)
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{
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int indexOfEnd = text.IndexOf('>', indexOfTag);
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if (indexOfEnd > 0)
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{
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text = text.Remove(indexOfTag, indexOfEnd - indexOfTag + 1);
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text = text.Replace("</" + tag + ">", string.Empty);
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}
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}
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return text;
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}
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private static TimeCode GetTimeCodeFromString(string time)
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{
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// hh:mm:ss.mmm
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string[] timeCode = time.Trim().Split(':', '.', ' ');
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return new TimeCode(int.Parse(timeCode[0]),
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int.Parse(timeCode[1]),
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int.Parse(timeCode[2]),
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int.Parse(timeCode[3]));
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}
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}
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}
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