mirror of
https://github.com/SubtitleEdit/subtitleedit.git
synced 2024-11-22 11:12:36 +01:00
358 lines
14 KiB
C#
358 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace Nikse.SubtitleEdit.Core.SubtitleFormats
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{
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public class CheetahCaption : SubtitleFormat
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{
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private static readonly List<int> LatinCodes = new List<int> {
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0x81, // ♪
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0x82, // á
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0x83, // é
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0x84, // í
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0x85, // ó
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0x86, // ú
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0x87, // â
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0x88, // ê
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0x89, // î
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0x8A, // ô
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0x8B, // û
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0x8C, // à
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0x8D, // è
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0x8E, // Ñ
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0x8F, // ñ
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0x90, // ç
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0x91, // ¢
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0x92, // £
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0x93, // ¿
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0x94, // ½
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0x95, // ®
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};
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private static readonly IList<char> LatinLetters = new List<char> {
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'♪',
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'á',
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'é',
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'í',
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'ó',
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'ú',
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'â',
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'ê',
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'î',
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'ô',
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'û',
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'à',
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'è',
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'Ñ',
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'ñ',
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'ç',
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'¢',
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'£',
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'¿',
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'½',
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'®',
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};
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public override string Extension
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{
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get { return ".cap"; }
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}
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public const string NameOfFormat = "Cheetah Caption";
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public override string Name
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{
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get { return NameOfFormat; }
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}
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public override bool IsTimeBased
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{
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get { return true; }
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}
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public static void Save(string fileName, Subtitle subtitle)
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{
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using (var fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
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{
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byte[] buffer = { 0xEA, 0x22, 1, 0 }; // header
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fs.Write(buffer, 0, buffer.Length);
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int numberOfLines = subtitle.Paragraphs.Count;
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fs.WriteByte((byte)(numberOfLines % 256)); // paragraphs - low byte
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fs.WriteByte((byte)(numberOfLines / 256)); // paragraphs - high byte
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buffer = new byte[] { 9, 0xA8, 0xAF, 0x4F }; // ?
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fs.Write(buffer, 0, buffer.Length);
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for (int i = 0; i < 118; i++)
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fs.WriteByte(0);
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// paragraphs
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for (int index = 0; index < subtitle.Paragraphs.Count; index++)
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{
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Paragraph p = subtitle.Paragraphs[index];
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Paragraph next = subtitle.GetParagraphOrDefault(index + 1);
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string text = p.Text;
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var bufferShort = new byte[]
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{
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0,
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0,
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3, // justification, 1=left, 2=right, 3=center
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0xE, //horizontal position, 1=top, F=bottom
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0x10 //horizontal position, 3=left, 0x10=center, 0x19=right
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};
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//styles + ?
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buffer = new byte[]
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{
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0x12,
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1,
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0,
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0,
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0,
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0,
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3, // justification, 1=left, 2=right, 3=center
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0xF, //horizontal position, 1=top, F=bottom
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0x10 //horizontal position, 3=left, 0x10=center, 0x19=right
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};
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//Normal : 12 01 00 00 00 00 03 0F 10
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//Right-top : 12 01 00 00 00 00 03 01 1C
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//Top : 12 01 00 00 00 00 03 01 10
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//Left-top : 12 01 00 00 00 00 03 01 05
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//Left : 12 01 00 00 00 00 03 0F 0A
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//Right : 12 01 00 00 00 00 03 0F 1E
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//Left : 12 03 00 00 00 00 03 0F 07
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if (text.StartsWith("{\\an7}", StringComparison.Ordinal) || text.StartsWith("{\\an8}", StringComparison.Ordinal) || text.StartsWith("{\\an9}", StringComparison.Ordinal))
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{
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buffer[7] = 1; // align top (vertial)
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bufferShort[3] = 1; // align top (vertial)
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}
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else if (text.StartsWith("{\\an4}", StringComparison.Ordinal) || text.StartsWith("{\\an5}", StringComparison.Ordinal) || text.StartsWith("{\\an6}", StringComparison.Ordinal))
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{
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buffer[7] = 8; // center (vertical)
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bufferShort[3] = 8; // align top (vertial)
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}
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if (text.StartsWith("{\\an7}", StringComparison.Ordinal) || text.StartsWith("{\\an4}", StringComparison.Ordinal) || text.StartsWith("{\\an1}", StringComparison.Ordinal))
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{
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buffer[8] = 2; // align left (horizontal)
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bufferShort[4] = 2; // align left (horizontal)
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}
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else if (text.StartsWith("{\\an9}", StringComparison.Ordinal) || text.StartsWith("{\\an6}", StringComparison.Ordinal) || text.StartsWith("{\\an3}", StringComparison.Ordinal))
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{
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buffer[8] = 0x1e; // align right (vertical)
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bufferShort[4] = 0x1e; // align right (vertical)
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}
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int startTag = text.IndexOf('}');
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if (text.StartsWith("{\\", StringComparison.Ordinal) && startTag > 0 && startTag < 10)
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{
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text = text.Remove(0, startTag + 1);
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}
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var textBytes = new List<byte>();
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var italic = p.Text.StartsWith("<i>", StringComparison.Ordinal) && p.Text.EndsWith("</i>", StringComparison.Ordinal);
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text = HtmlUtil.RemoveHtmlTags(text);
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int j = 0;
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if (italic)
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textBytes.Add(0xd0);
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var encoding = Encoding.GetEncoding(1252);
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while (j < text.Length)
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{
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if (text.Substring(j).StartsWith(Environment.NewLine))
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{
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j += Environment.NewLine.Length;
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textBytes.Add(0);
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textBytes.Add(0);
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textBytes.Add(0);
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textBytes.Add(0);
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if (italic)
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textBytes.Add(0xd0);
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}
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else
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{
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int idx = LatinLetters.IndexOf(text[j]);
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if (idx >= 0)
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textBytes.Add((byte)LatinCodes[idx]);
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else
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textBytes.Add(encoding.GetBytes(new[] { text[j] })[0]);
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j++;
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}
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}
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int length = textBytes.Count + 20;
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long end = fs.Position + length;
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if (Configuration.Settings.SubtitleSettings.CheetahCaptionAlwayWriteEndTime || (next != null && next.StartTime.TotalMilliseconds - p.EndTime.TotalMilliseconds >= 1500))
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{
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fs.WriteByte((byte)(length));
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if (p.Text.Trim().Contains(Environment.NewLine))
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fs.WriteByte(0x62); // two lines?
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else
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fs.WriteByte(0x61); // one line?
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WriteTime(fs, p.StartTime);
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WriteTime(fs, p.EndTime);
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fs.Write(buffer, 0, buffer.Length); // styles
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}
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else
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{
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length = textBytes.Count + 20 - (buffer.Length - bufferShort.Length);
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end = fs.Position + length;
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fs.WriteByte((byte)(length));
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if (p.Text.Trim().Contains(Environment.NewLine))
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fs.WriteByte(0x42); // two lines?
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else
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fs.WriteByte(0x41); // one line?
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WriteTime(fs, p.StartTime);
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fs.WriteByte(2);
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fs.WriteByte(1);
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fs.WriteByte(0);
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fs.WriteByte(0);
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fs.Write(bufferShort, 0, bufferShort.Length); // styles
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}
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foreach (byte b in textBytes) // text
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fs.WriteByte(b);
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while (end > fs.Position)
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fs.WriteByte(0);
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}
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}
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}
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private static void WriteTime(FileStream fs, TimeCode timeCode)
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{
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fs.WriteByte((byte)timeCode.Hours);
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fs.WriteByte((byte)timeCode.Minutes);
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fs.WriteByte((byte)timeCode.Seconds);
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fs.WriteByte((byte)MillisecondsToFramesMaxFrameRate(timeCode.Milliseconds));
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}
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public override bool IsMine(List<string> lines, string fileName)
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{
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if (!string.IsNullOrEmpty(fileName) && File.Exists(fileName))
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{
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var fi = new FileInfo(fileName);
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if (fi.Length >= 200 && fi.Length < 1024000) // not too small or too big
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{
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if (fileName.EndsWith(".cap", StringComparison.OrdinalIgnoreCase))
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{
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byte[] buffer = FileUtil.ReadAllBytesShared(fileName);
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for (int i = 0; i < buffer.Length - 20; i++)
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{
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if (buffer[i + 0] == 0xEA &&
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buffer[i + 1] == 0x22 &&
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buffer[i + 2] <= 3)
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return true;
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}
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}
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}
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}
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return false;
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}
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public override string ToText(Subtitle subtitle, string title)
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{
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return "Not supported!";
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}
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private static TimeCode DecodeTimestamp(byte[] buffer, int index)
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{
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return new TimeCode(buffer[index], buffer[index + 1], buffer[index + 2], FramesToMillisecondsMax999(buffer[index + 3]));
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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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subtitle.Paragraphs.Clear();
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subtitle.Header = null;
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byte[] buffer = FileUtil.ReadAllBytesShared(fileName);
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int i = 128;
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Paragraph last = null;
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var sb = new StringBuilder();
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while (i < buffer.Length - 20)
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{
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var p = new Paragraph();
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int length = buffer[i];
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int textLength = length - 20;
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int start = 19;
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for (int j = 0; j < 4; j++)
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{
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if (buffer[i + start - 1] > 0x10)
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{
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start--;
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textLength++;
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}
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}
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if (textLength > 0 && buffer.Length >= i + textLength)
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{
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p.StartTime = DecodeTimestamp(buffer, i + 2);
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if (last != null && last.EndTime.TotalMilliseconds > p.StartTime.TotalMilliseconds)
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last.EndTime.TotalMilliseconds = p.StartTime.TotalMilliseconds - Configuration.Settings.General.MinimumMillisecondsBetweenLines;
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p.EndTime = DecodeTimestamp(buffer, i + 6);
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sb.Clear();
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int j = 0;
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bool italics = false;
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var encoding = Encoding.GetEncoding(1252);
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while (j < textLength)
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{
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int index = i + start + j;
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if (buffer[index] == 0)
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{
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if (italics)
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sb.Append("</i>");
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italics = false;
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if (!sb.ToString().EndsWith(Environment.NewLine))
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sb.AppendLine();
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}
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else if (LatinCodes.Contains(buffer[index]))
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{
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sb.Append(LatinLetters[LatinCodes.IndexOf(buffer[index])]);
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}
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else if (buffer[index] >= 0xC0 || buffer[index] <= 0x14) // codes/styles?
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{
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if (buffer[index] == 0xd0) // italics
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{
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italics = true;
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sb.Append("<i>");
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}
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}
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else
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{
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sb.Append(encoding.GetString(buffer, index, 1));
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}
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j++;
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}
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if (italics)
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sb.Append("</i>");
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p.Text = sb.ToString().Trim();
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p.Text = p.Text.Replace("</i>" + Environment.NewLine + "<i>", Environment.NewLine);
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subtitle.Paragraphs.Add(p);
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last = p;
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}
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if (length == 0)
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length++;
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i += length;
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}
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if (last != null && last.Duration.TotalMilliseconds > Configuration.Settings.General.SubtitleMaximumDisplayMilliseconds)
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last.EndTime.TotalMilliseconds = last.StartTime.TotalMilliseconds + Utilities.GetOptimalDisplayMilliseconds(last.Text);
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subtitle.Renumber();
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}
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}
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}
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