Aegisub/vsfilter/subtitles/CCDecoder.cpp

/* 
 *	Copyright (C) 2003-2006 Gabest
 *	http://www.gabest.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#include "StdAfx.h"
#include "ccdecoder.h"

CCDecoder::CCDecoder(CString fn, CString rawfn) : m_fn(fn), m_rawfn(rawfn)
{
	m_sts.CreateDefaultStyle(ANSI_CHARSET);

	m_time = 0;
	m_fEndOfCaption = false;
	memset(m_buff, 0, sizeof(m_buff));
	memset(m_disp, 0, sizeof(m_disp));
	m_cursor = CPoint(0, 0);

	if(!m_rawfn.IsEmpty()) 
		_tremove(m_rawfn);
}

CCDecoder::~CCDecoder()
{
	if(!m_sts.IsEmpty() && !m_fn.IsEmpty()) 
	{
		m_sts.Sort();
		m_sts.SaveAs(m_fn, EXTSRT, -1, CTextFile::ASCII);
		m_sts.SaveAs(m_fn.Left(m_fn.ReverseFind('.')+1) + _T("utf8.srt"), EXTSRT, -1, CTextFile::UTF8);
		m_sts.SaveAs(m_fn.Left(m_fn.ReverseFind('.')+1) + _T("utf16le.srt"), EXTSRT, -1, CTextFile::LE16);
		m_sts.SaveAs(m_fn.Left(m_fn.ReverseFind('.')+1) + _T("utf16be.srt"), EXTSRT, -1, CTextFile::BE16);
	}
}

void CCDecoder::MoveCursor(int x, int y)
{
	m_cursor = CPoint(x, y);
	if(m_cursor.x < 0) m_cursor.x = 0;
	if(m_cursor.y < 0) m_cursor.y = 0;
	if(m_cursor.x >= 32) m_cursor.x = 0, m_cursor.y++;
	if(m_cursor.y >= 16) m_cursor.y = 0;
}

void CCDecoder::OffsetCursor(int x, int y)
{
	MoveCursor(m_cursor.x + x, m_cursor.y + y);
}

void CCDecoder::PutChar(WCHAR c)
{
	m_buff[m_cursor.y][m_cursor.x] = c;
	OffsetCursor(1, 0);
}

void CCDecoder::SaveDisp(__int64 time)
{
	CStringW str;

	for(int row = 0; row < 16; row++)
	{
		bool fNonEmptyRow = false;

		for(int col = 0; col < 32; col++)
		{
			if(m_disp[row][col]) 
			{
				CStringW str2(&m_disp[row][col]);
				if(fNonEmptyRow) str += ' ';
				str += str2;
				col += str2.GetLength();
				fNonEmptyRow = true;
			}
		}

		if(fNonEmptyRow) str += '\n';
	}

	if(str.IsEmpty()) return;

	m_sts.Add(str, true, (int)m_time, (int)time);
}

void CCDecoder::DecodeCC(BYTE* buff, int len, __int64 time)
{
	if(!m_rawfn.IsEmpty())
	{
		if(FILE* f = _tfopen(m_rawfn, _T("at")))
		{
			_ftprintf(f, _T("%02d:%02d:%02d.%03d\n"), 
				(int)(time/1000/60/60), 
				(int)((time/1000/60)%60), 
				(int)((time/1000)%60), 
				(int)(time%1000));

			for(int i = 0; i < len; i++)
			{
				_ftprintf(f, _T("%02x"), buff[i]);
				if(i < len-1) _ftprintf(f, _T(" "));
				if(i > 0 && (i&15)==15) _ftprintf(f, _T("\n"));
			}
			if(len > 0) _ftprintf(f, _T("\n\n"));
			fclose(f);
		}
	}

	for(int i = 0; i < len; i++)
	{
		BYTE c = buff[i]&0x7f;
		if(c >= 0x20)
		{
			static WCHAR charmap[0x60] = 
			{
				' ','!','"','#','$','%','&','\'','(',')','á','+',',','-','.','/',
				'0','1','2','3','4','5','6','7','8','9',':',';','<','=','>','?',
				'@','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',
				'P','Q','R','S','T','U','V','W','X','Y','Z','[','é',']','í','ó',
				'ú','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
				'p','q','r','s','t','u','v','w','x','y','z','ç','÷','N','n','?'
			};

			PutChar(charmap[c - 0x20]);
		}
		else if(buff[i] != 0x80 && i < len-1)
		{
			// codes and special characters are supposed to be doubled
			if(i < len-3 && buff[i] == buff[i+2] && buff[i+1] == buff[i+3])
 				i += 2;

			c = buff[i+1]&0x7f;
			if(buff[i] == 0x91 && c >= 0x20 && c < 0x30) // formating
			{
				// TODO
			}
			else if(buff[i] == 0x91 && c == 0x39) // transparent space
			{
 				OffsetCursor(1, 0);
			}
			else if(buff[i] == 0x91 && c >= 0x30 && c < 0x40) // special characters
			{
				static WCHAR charmap[0x10] =
				{
					0x00ae, // (r)egistered
					0x00b0, // degree
					0x00bd, // 1/2
					0x00bf, // inverted question mark
					0x2122, // trade mark
					0x00a2, // cent
					0x00a3, // pound
					0x266a, // music
					0x00e0, // a`
					0x00ff, // transparent space, handled above
					0x00e8, // e`
					0x00e2, // a^
					0x00ea, // e^
					0x00ee, // i^
					0x00f4, // o^
					0x00fb, // u^
				};

				PutChar(charmap[c - 0x30]);
			}
			else if(buff[i] == 0x92 && c >= 0x20 && c < 0x40) // extended characters
			{
				static WCHAR charmap[0x20] =
				{
					0x00c0, // A'
					0x00c9, // E'
					0x00d3, // O'
					0x00da, // U'
					0x00dc, // U:
					0x00fc, // u:
					0x2018, // `
					0x00a1, // inverted !
					0x002a, // *
					0x2019, // '
					0x002d, // -
					0x00a9, // (c)opyright
					0x2120, // SM
					0x00b7, // . (dot in the middle)
					0x201c, // inverted "
					0x201d, // "

					0x00c1, // A`
					0x00c2, // A^
					0x00c7, // C,
					0x00c8, // E`
					0x00ca, // E^
					0x00cb, // E:
					0x00eb, // e:
					0x00ce, // I^
					0x00cf, // I:
					0x00ef, // i:
					0x00d4, // O^
					0x00d9, // U`
					0x00f9, // u`
					0x00db, // U^
					0x00ab, // <<
					0x00bb, // >>
				};

				PutChar(charmap[c - 0x20]);
			}
			else if(buff[i] == 0x13 && c >= 0x20 && c < 0x40) // more extended characters
			{
				static WCHAR charmap[0x20] =
				{
					0x00c3, // A~
					0x00e3, // a~
					0x00cd, // I'
					0x00cc, // I`
					0x00ec, // i`
					0x00d2, // O`
					0x00f2, // o`
					0x00d5, // O~
					0x00f5, // o~
					0x007b, // {
					0x007d, // }
					0x005c, // /* \ */
					0x005e, // ^
					0x005f, // _
					0x00a6, // |
					0x007e, // ~

					0x00c4, // A:
					0x00e4, // a:
					0x00d6, // O:
					0x00f6, // o:
					0x00df, // B (ss in german)
					0x00a5, // Y=
					0x00a4, // ox
					0x007c, // |
					0x00c5, // Ao
					0x00e5, // ao
					0x00d8, // O/
					0x00f8, // o/
					0x250c, // |-
					0x2510, // -|
					0x2514, // |_
					0x2518, // _|
				};

				PutChar(charmap[c - 0x20]);
			}
			else if(buff[i] == 0x94 && buff[i+1] == 0xae) // Erase Non-displayed [buffer] Memory
			{
				memset(m_buff, 0, sizeof(m_buff));
			}
			else if(buff[i] == 0x94 && buff[i+1] == 0x20) // Resume Caption Loading
			{
				memset(m_buff, 0, sizeof(m_buff));
			}
			else if(buff[i] == 0x94 && buff[i+1] == 0x2f) // End Of Caption
			{
 				if(memcmp(m_disp, m_buff, sizeof(m_disp)) != 0)
 				{
 					if(m_fEndOfCaption)
 						SaveDisp(time + (i/2)*1000/30);
 
 					m_fEndOfCaption = true;
 					memcpy(m_disp, m_buff, sizeof(m_disp));
 					m_time = time + (i/2)*1000/30;
 				}
			}
			else if(buff[i] == 0x94 && buff[i+1] == 0x2c) // Erase Displayed Memory
			{
				if(m_fEndOfCaption)
				{
					m_fEndOfCaption = false;
 					SaveDisp(time + (i/2)*1000/30);
				}

				memset(m_disp, 0, sizeof(m_disp));
			}
			else if(buff[i] == 0x97 && (buff[i+1] == 0xa1 || buff[i+1] == 0xa2 || buff[i+1] == 0x23)) // Tab Over
			{
				OffsetCursor(buff[i+1]&3, 0);
			}
			else if(buff[i] == 0x91 || buff[i] == 0x92 || buff[i] == 0x15 || buff[i] == 0x16 
				|| buff[i] == 0x97 || buff[i] == 0x10 || buff[i] == 0x13 || buff[i] == 0x94) // curpos, color, underline
			{
				int row = 0;
				switch(buff[i])
				{
				default:
				case 0x91: row = 0; break;
				case 0x92: row = 2; break;
				case 0x15: row = 4; break;
				case 0x16: row = 6; break;
				case 0x97: row = 8; break;
				case 0x10: row = 10; break;
				case 0x13: row = 12; break;
				case 0x94: row = 14; break;
				}
				if(buff[i+1]&0x20) row++;

				int col = buff[i+1]&0xe;
				if(col == 0 || (col > 0 && !(buff[i+1]&0x10))) col = 0;
				else col <<= 1;

				MoveCursor(col, row);
			}
			else
			{
				int iiii = 0;
			}

			i++;
		}
	}
}

void CCDecoder::ExtractCC(BYTE* buff, int len, __int64 time)
{
	for(int i = 0; i < len-9; i++)
	{
		if(*(DWORD*)&buff[i] == 0xb2010000 && *(DWORD*)&buff[i+4] == 0xf8014343)
		{
			i += 8;
			int nBytes = buff[i++]&0x3f;
			if(nBytes > 0)
			{
				nBytes = (nBytes+1)&~1;

				BYTE* pData1 = new BYTE[nBytes];
				BYTE* pData2 = new BYTE[nBytes];

				if(pData1 && pData2)
				{
					int nBytes1 = 0, nBytes2 = 0;

					for(int j = 0; j < nBytes && i < 0x800;)
					{
						if(buff[i++] == 0xff)
						{
							pData1[nBytes1++] = buff[i++];
							pData1[nBytes1++] = buff[i++];
						}
						else i+=2;
						
						j++;

						if(j >= nBytes) break;

						if(buff[i++] == 0xff)
						{
							pData2[nBytes2++] = buff[i++];
							pData2[nBytes2++] = buff[i++];
						}
						else i+=2;

						j++;
					}

					if(nBytes1 > 0)
						DecodeCC(pData1, nBytes1, time);

					if(nBytes2 > 0)
						DecodeCC(pData2, nBytes2, time);
				}

				if(pData1) delete [] pData1;
				if(pData2) delete [] pData2;
			}

			break;
		}
	}
}