teletext.java

优秀的MPEG2-TS流分析软件

/*
 * @(#)Teletext.java - constants/decode of teletext System B
 *
 * Copyright (c) 2001-2005 by dvb.matt, All Rights Reserved. 
 * 
 * This file is part of X, a free Java based demux utility.
 * X is intended for educational purposes only, as a non-commercial test project.
 * It may not be used otherwise. Most parts are only experimental.
 * 
 *
 * This program is free software; you can redistribute it free of charge
 * and/or modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

package net.sourceforge.dvb.projectx.subtitle;

import java.util.Hashtable;

import net.sourceforge.dvb.projectx.common.X;

public final class Teletext
{
	private Teletext()
	{}

	private final static String[] ssaHeader = {
		"[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/",
		"; or email [e-mail]",
		"; to burn-in these subtitles into an AVI, just install subtitler2.3 PlugIn for VirtualDub, see doom9.org",
		"Title: Subtitles taken from TV teletext",
		"Original Script: by their respective owner",
		"ScriptType: v4.00",
		"Collisions: Normal",
		"PlayResY: 240",      // maybe replaced [10]
		"PlayDepth: 0", 
		"Timer: 100.0000",    // maybe replaced [12]
		"[V4 Styles]",
		"Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding",
		"Style: MainB,Arial,14,&H00FFFF,&H00FFFF,&H00FFFF,0,0,-1,1,2,4,1,16,16,16,0,0",
		"Style: MainT,Arial,14,&HFFFFFF,&HFFFFFF,&HFFFFFF,0,1,0,1,2,4,1,16,16,16,0,0",
		"Style: MainI,Arial,14,&HFFFFFF,&HFFFFFF,&HFFFFFF,0,1,1,1,2,4,1,16,16,16,0,0",   //DM30122003 081.6 int10 add
		"Style: MainC,Courier New,14,&HFFFFFF,&HFFFFFF,&HFFFFFF,0,1,0,1,2,4,1,16,16,16,0,0",
		"[Events]",
		"Format: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text",
		"Comment: Marked=0,0:00:00.00,0:00:00.01,MainB,,0000,0000,0000,!Effect,This script was created by decoding a tv teletext stream to build coloured subtitles"
	};

	private final static String[] ssaLine = { 
		"Dialogue: Marked=0,",
		",MainT,,0000,0000,0000,!Effect,{\\q2\\a2}"
	};

	//DM26052004 081.7 int03 changed
	private final static String[] stlHeader = {
		"",
		"//Font select and font size",
		"$FontName   = Arial",
		"$FontSize   = 30",
		"//Character attributes (global)",
		"$Bold    = FALSE",
		"$UnderLined = FALSE",
		"$Italic  = FALSE",
		"//Position Control",
		"$HorzAlign = Center",
		"$VertAlign = Bottom",
		"$XOffset   = 10",
		"$YOffset   = 10",
		"//Contrast Control",
		"$TextContrast        = 15",
		"$Outline1Contrast    = 8",
		"$Outline2Contrast    = 15",
		"$BackgroundContrast  = 0",
		"//Effects Control",
		"$ForceDisplay = FALSE",
		"$FadeIn   = 0",
		"$FadeOut  = 0",
		"//Other Controls",
		"$TapeOffset = FALSE",
		"//Colors",
		"$ColorIndex1 = 0",
		"$ColorIndex2 = 1",
		"$ColorIndex3 = 2",
		"$ColorIndex4 = 3",
		"//Subtitles"
	};

	//DM14052004 081.7 int02 add
	private final static String[] sonHeader = {
		"st_format\t2",
		"Display_Start\tnon_forced",
		"TV_Type\t\tPAL",
		"Tape_Type\tNON_DROP",
		"Pixel_Area\t(0 575)",
		"Directory\t",
		"",
		"SP_NUMBER\tSTART\t\tEND\t\tFILE_NAME"
	};

	private final static String[] colors = {
		"{\\c&HC0C0C0&}",   // black /gray
		"{\\c&H4040FF&}",   // red
		"{\\c&H00FF00&}",   // green
		"{\\c&H00FFFF&}",   // yellow
		"{\\c&HFF409B&}",   // blue //DM15032004 081.6 int18 changed
		"{\\c&HFF00FF&}",   // magenta
		"{\\c&HFFFF00&}",   // cyan
		"{\\c&HFFFFFF&}",   // white
	};


	//DM14052004 081.7 int02 add
	public static String[] getSONHead(String path, long frame_rate)
	{
		if (frame_rate != 3600)
		{
			sonHeader[2] = "TV_Type\t\tNTSC";
			sonHeader[3] = "Tape_Type\tDROP";
		}
		else
		{
			sonHeader[2] = "TV_Type\t\tPAL";
			sonHeader[3] = "Tape_Type\tNON_DROP";
		}

		sonHeader[5] = "Directory\t" + path;

		return sonHeader;
	}

	/*****************
	 * return STL header *
	 *****************/
	public static String[] getSTLHead(String version)
	{
		stlHeader[0] = 	"//Generated by " + version;

		return stlHeader;
	}

	/*****************
	 * return SSA header *
	 *****************/
	public static String[] getSSAHead()
	{ 
		return ssaHeader; 
	}

	/*****************
	 * return SSA line *
	 *****************/
	public static String[] getSSALine()
	{ 
		return ssaLine; 
	}

	/*****************
	 * return SMPTE *
 	*****************/
	public static String SMPTE(String time, long videoframetime)
	{
		StringBuffer a = new StringBuffer();
		a.append(time.substring(0, 8) + ":00");
		String b = "" + (Integer.parseInt(time.substring(9, 12)) / ((int)videoframetime / 90));
		a.replace((b.length() == 1) ? 10 : 9 , 11, b);

		return a.toString();
	}

	/*****************
	 * change endian *
 	*****************/
	public static byte bytereverse(byte n)
	{
		n = (byte) (((n >> 1) & 0x55) | ((n << 1) & 0xaa));
		n = (byte) (((n >> 2) & 0x33) | ((n << 2) & 0xcc));
		n = (byte) (((n >> 4) & 0x0f) | ((n << 4) & 0xf0));
		return n;
	}

	/**************
	 * set parity *
	 **************/
	public static byte parity(byte n)
	{
		boolean par=true;

		if (n == 0) 
			return n;

		for (int a=0; a < 8; a++) 
			if ((n>>>a & 1) == 1) 
				par = !par;

		if (par) 
			return (byte)(0x80 | n);

		return n;
	}

	/****************
	 * check parity *
 	****************/
	public static boolean cparity(byte n)
	{
		boolean par=true;

		if (n == 0) 
			return true;

		for (int a=0; a < 7; a++) 
			if ((n>>>a & 1) == 1) 
				par = !par;

		if (par && (1 & n>>>7) == 1) 
			return true;

		else if (!par && (1 & n>>>7) == 0) 
			return true;

		return false;
	}


	//DM24052004 081.7 int03 introduced
	//no error correction ATM
	public static int hamming24_18(byte b[], int off)
	{
		int val = 0;

		val |= (0xFE & b[off + 2])>>>1;
		val |= (0xFE & b[off + 1])<<6;
		val |= (0xE & b[off])<<13;
		val |= (0x20 & b[off])<<12;

		return val;
	}

	/******************
	 * hamming decode *
	 ******************/
	//DM12032004 081.6 int18 changed
	//DM24052004 081.7 int03 changed
	public static byte hamming_decode(byte a)
	{
		switch (0xFF & a)
		{
		case 0xa8: 
			return 0;
		case 0x0b: 
			return 1;
		case 0x26: 
			return 2;
		case 0x85: 
			return 3;
		case 0x92: 
			return 4;
		case 0x31: 
			return 5;
		case 0x1c: 
			return 6;
		case 0xbf: 
			return 7;
		case 0x40: 
			return 8;
		case 0xe3: 
			return 9;
		case 0xce: 
			return 10;
		case 0x6d: 
			return 11;
		case 0x7a: 
			return 12;
		case 0xd9: 
			return 13;
		case 0xf4: 
			return 14;
		case 0x57: 
			return 15;
		default: 
			return -1;     // decode error , not yet corrected
		}
	}


	/******************************
	 * make suppic from teletext *
	 ******************************/
	//DM30122003 081.6 int10 changed
	//DM24072004 081.7 int07 changed
	//DM09082004 081.7 int08 changed
	public static int[] makepic(byte[] packet, int offset, int len, int row, int character_set, boolean checkParity)
	{
		//  return int char<<8 | 0xF0 & active_color backgrnd | 0xF & active_color foregrnd

		boolean ascii = true, toggle = false;
		int chars[] = new int[len];
		int active_color = 7;  // init with white ascii color per line + black background

		int primary_set_mapping = X.getForcedTTXLanguage() < 0 ? 0 : X.getForcedTTXLanguage();
		int primary_national_set_mapping = character_set;

		int secondary_set_mapping = primary_set_mapping;
		int secondary_national_set_mapping = primary_national_set_mapping;

		if (page_modifications.containsKey("primary_set"))
			secondary_set_mapping = primary_set_mapping = Integer.parseInt(page_modifications.get("primary_set").toString());

		if (page_modifications.containsKey("primary_national_set"))
			secondary_national_set_mapping = primary_national_set_mapping = Integer.parseInt(page_modifications.get("primary_national_set").toString());

		if (page_modifications.containsKey("secondary_set"))
		{
			secondary_set_mapping = Integer.parseInt(page_modifications.get("secondary_set").toString());
			secondary_national_set_mapping = Integer.parseInt(page_modifications.get("secondary_national_set").toString());
		}

		active_set = CharSet.getActive_G0_Set(primary_set_mapping, primary_national_set_mapping, row);
		active_national_set = CharSet.getActiveNationalSubset(primary_set_mapping, primary_national_set_mapping, row);


		for (int c = offset, val, i = 0; i < len; c++, i++)
		{
			val = row<<16 | i;

			if (page_modifications.containsKey("" + val))
			{
				chars[i] = active_color | (int)(page_modifications.get("" + val).toString().charAt(0))<<8;
				continue;
			}

			if (checkParity && !cparity(packet[c])) 
				packet[i] = 8; //if error, switch to graphics mode (= space)

			int char_value = 0x7F & bytereverse(packet[c]);

			if (char_value>>>3 == 0) //0x0..7
			{ 
				ascii=true; 
				chars[i] = (active_set[32]<<8 | active_color); 
				active_color = (0xF0 & active_color) | char_value; 
				continue; 
			}
			else if (char_value>>>4 == 0)  //0x8..F
			{ 
				chars[i] = active_set[32]<<8 | active_color; 
				continue; 
			}
			else if (char_value>>>7 == 1)  //0x80..FF
			{ 
				chars[i] = active_set[32]<<8 | active_color; 
				continue; 
			}
			else if (char_value < 27)  //0x10..1A
			{ 
				ascii = false; 
				chars[i] = active_set[32]<<8 | active_color; 
				continue; 
			}
			else if (char_value < 32) //0x1B..1F
			{
				switch (char_value)    //1d=new bg with last color, 1c=black bg, 1b ESC
				{
				case 0x1B:
					if (toggle)