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/* =============================================================
* File : vbidecoder.cpp
* Author: Frank Muenchow <beebof@gmx.de>
* Martin Barnasconi
* Date : 2005-10-25
*
* 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.
*
* ============================================================= */
#include <cstring>
#include <stdint.h>
#include <ctype.h>
extern "C" {
#include <inttypes.h>
#include "ivtv_myth.h"
#include "vbitext/vt.h"
}
using namespace std;
#include "osd.h"
#include "teletextdecoder.h"
#include "vbilut.h"
#include "mythverbose.h"
/******************************************************************/
//Decoder section
//
/** \fn TeletextDecoder::Decode(const unsigned char*, int)
* \brief Decodes teletext data
*
* \param buf Points to the teletext data
* \param vbimode VBI-Mode (as defined in vbilut.h)
*/
void TeletextDecoder::Decode(const unsigned char *buf, int vbimode)
{
int err = 0, latin1 = -1, zahl1, pagenum, subpagenum, lang, flags;
uint magazine, packet, header;
if (!m_teletextviewer)
{
VERBOSE(VB_VBI, "TeletextDecoder: No Teletext Viewer defined!");
return;
}
m_decodertype = vbimode;
switch (vbimode)
{
case VBI_IVTV:
header = hamm16(buf, &err);
if (err & 0xf000)
return; // error in data header
magazine = header & 7;
packet = (header >> 3) & 0x1f;
buf += 2;
break;
case VBI_DVB:
case VBI_DVB_SUBTITLE:
zahl1 = hamm84(buf,&err) * 16 + hamm84(buf+1,&err);
magazine = 0;
if (buf[0] & 0x40)
magazine += 1;
if (buf[0] & 0x10)
magazine += 2;
if (buf[0] & 0x04)
magazine += 4;
packet = 0;
if (buf[0] & 0x01)
packet += 1;
if (buf[1] & 0x40)
packet += 2;
if (buf[1] & 0x10)
packet += 4;
if (buf[1] & 0x04)
packet += 8;
if (buf[1] & 0x01)
packet += 16;
if (err == 1)
return; // error in data header
buf += 2;
break;
default:
return; // error in vbimode
}
switch (packet)
{
case 0: // Page Header
int b1, b2, b3, b4;
switch (vbimode)
{
case VBI_IVTV:
b1 = hamm16(buf, &err);// page number
b2 = hamm16(buf+2, &err);// subpage number + flags
b3 = hamm16(buf+4, &err);// subpage number + flags
b4 = hamm16(buf+6, &err);// language code + more flags
if (err & 0xf000)
return;
break;
case VBI_DVB:
case VBI_DVB_SUBTITLE:
b1 = hamm84(buf+1, &err)*16+hamm84(buf, &err);
b2 = hamm84(buf+3, &err)*16+hamm84(buf+2, &err);
b3 = hamm84(buf+5, &err)*16+hamm84(buf+4, &err);
b4 = hamm84(buf+7, &err)*16+hamm84(buf+6, &err);
if (err == 1)
return;
break;
default:
return; // error in vbimode
}
//VERBOSE(VB_VBI, QString("Page Header found: "
// "Magazine %1, Page Number %2")
// .arg(magazine).arg(b1));
subpagenum= (b2 + b3 * 256) & 0x3f7f;
pagenum = (magazine?:8)*256 + b1;
lang = "\0\4\2\6\1\5\3\7"[b4 >> 5] + (latin1 ? 0 : 8);
flags = b4 & 0x1F;
flags |= b3 & 0xC0;
flags |= (b2 & 0x80) >> 2;
m_teletextviewer->AddPageHeader(pagenum, subpagenum, buf,
vbimode, lang, flags);
break;
default: // Page Data
m_teletextviewer->AddTeletextData((magazine?:8), packet,
buf, vbimode);
break;
}
}
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