dvbdescriptors.cpp

#include <unistd.h>

#include <QTextCodec>

#include "dvbdescriptors.h"
#include "iso6937tables.h"
#include "freesat_huffman.h"
#include "mythverbose.h"


// Only some of the QTextCodec calls are reenterant.
// If you use this please verify that you are using a reenterant call.
static const QTextCodec *iso8859_codecs[16] =
{
    QTextCodec::codecForName("Latin1"),
    QTextCodec::codecForName("ISO8859-1"),  // Western
    QTextCodec::codecForName("ISO8859-2"),  // Central European
    QTextCodec::codecForName("ISO8859-3"),  // Central European
    QTextCodec::codecForName("ISO8859-4"),  // Baltic
    QTextCodec::codecForName("ISO8859-5"),  // Cyrillic
    QTextCodec::codecForName("ISO8859-6"),  // Arabic
    QTextCodec::codecForName("ISO8859-7"),  // Greek
    QTextCodec::codecForName("ISO8859-8"),  // Hebrew, visually ordered
    QTextCodec::codecForName("ISO8859-9"),  // Turkish
    QTextCodec::codecForName("ISO8859-10"),
    QTextCodec::codecForName("ISO8859-11"),
    QTextCodec::codecForName("ISO8859-12"),
    QTextCodec::codecForName("ISO8859-13"),
    QTextCodec::codecForName("ISO8859-14"),
    QTextCodec::codecForName("ISO8859-15"), // Western
};

static QString decode_iso6937(const unsigned char *buf, uint length)
{
    // ISO/IEC 6937 to unicode (UCS2) convertor...
    // This is a composed encoding - accent first then plain character
    QString result = "";
    ushort ch = 0x20;
    for (uint i = 0; (i < length) && buf[i]; i++)
    {
        if (ch == 0xFFFF)
        {
            // Process second byte of two byte character
            ch = iso6937table_secondary[buf[i-1]][buf[i]];
            if (ch == 0xFFFF)
            {
                // If no valid code found in secondary table,
                // reprocess this second byte as first byte.
                ch = iso6937table_base[buf[i]];
                if (ch == 0xFFFF)
                    continue; // process second byte
            }
        }
        else
        {
            // Process first character of two possible characters.
            // double byte characters have a sentinel (0xffff) in this table.
            ch = iso6937table_base[buf[i]];
            if (ch == 0xFFFF)
                continue; // process second byte

        }
        result += QChar(ch);
    }
    return result;
}

static QString decode_text(const unsigned char *buf, uint length);

// Decode a text string according to ETSI EN 300 468 Annex A
QString dvb_decode_text(const unsigned char *src, uint raw_length,
                        const unsigned char *encoding_override,
                        uint encoding_override_length)
{
    if (!raw_length)
        return "";

    if (src[0] == 0x1f)
        return freesat_huffman_to_string(src, raw_length);

    if (((0x10 < src[0]) && (src[0] < 0x15)) || ((0x15 < src[0]) && (src[0] < 0x20)))
    {
        // TODO: Handle multi-byte encodings
        VERBOSE(VB_SIPARSER, "dvb_decode_text: "
                "Multi-byte coded text is not yet supported.");
        return "";
    }

    // if a override encoding is specified and the default ISO 6937 encoding
    // would be used copy the override encoding in front of the text
    unsigned char *dst = new unsigned char[ raw_length + encoding_override_length ];

    uint length = 0;
    if (encoding_override && src[0] >= 0x20) {
        memcpy(dst, encoding_override, encoding_override_length);
        length = encoding_override_length;
    }

    // Strip formatting characters
    for (uint i = 0; i < raw_length; i++)
    {
        if ((src[i] < 0x80) || (src[i] > 0x9F))
            dst[length++] = src[i];
        // replace CR/LF with a space
        else if (src[i] == 0x8A)
            dst[length++] = 0x20;
    }

    // Exit on empty string, sans formatting.

    QString sStr = (!length) ? "" : decode_text(dst, length);

    delete [] dst;

    return sStr;
}

static QString decode_text(const unsigned char *buf, uint length)
{
    // Decode using the correct text codec
    if (buf[0] >= 0x20)
    {
        return decode_iso6937(buf, length);
    }
    else if ((buf[0] >= 0x01) && (buf[0] <= 0x0B))
    {
        return iso8859_codecs[4 + buf[0]]->toUnicode((char*)(buf + 1), length - 1);
    }
    else if (buf[0] == 0x10)
    {
        // If the first byte of the text field has a value "0x10"
        // then the following two bytes carry a 16-bit value (uimsbf) N
        // to indicate that the remaining data of the text field is
        // coded using the character code table specified by
        // ISO Standard 8859, parts 1 to 9

        uint code = buf[1] << 8 | buf[2];
        if (code <= 15)
            return iso8859_codecs[code]->toUnicode((char*)(buf + 3), length - 3);
        else
            return QString::fromLocal8Bit((char*)(buf + 3), length - 3);
    }
    else if (buf[0] == 0x15) // Already Unicode
    {
        return QString::fromUtf8((char*)(buf + 1), length - 1);
    }
    else
    {
        // Unknown/invalid encoding - assume local8Bit
        return QString::fromLocal8Bit((char*)(buf + 1), length - 1);
    }
}


QString dvb_decode_short_name(const unsigned char *src, uint raw_length)
{
    if (raw_length > 50)
    {
        VERBOSE(VB_SIPARSER, QString("dvb_decode_short_name: name is %1 chars "
                                     "long. Unlikely to be a short name.")
                .arg(raw_length));
        return "";
    }

    if (((0x10 < src[0]) && (src[0] < 0x15)) || ((0x15 < src[0]) && (src[0] < 0x20)))
    {
        // TODO: Handle multi-byte encodings
        VERBOSE(VB_SIPARSER, "dvb_decode_short_name: "
                "Multi-byte coded text is not yet supported.");
        return "";
    }

    unsigned char *dst = new unsigned char[raw_length];
    uint length = 0;

    // check for emphasis control codes
    for (uint i = 0; i < raw_length; i++)
        if (src[i] == 0x86)
            while ((++i < raw_length) && (src[i] != 0x87))
            {
                if ((src[i] < 0x80) || (src[i] > 0x9F))
                    dst[length++] = src[i];
                // replace CR/LF with a space
                else if (src[i] == 0x8A)
                    dst[length++] = 0x20;
            }

    QString sStr = (!length) ? dvb_decode_text(src, raw_length) 
                             : decode_text(dst, length);
                                     
    delete [] dst;

    return sStr;
}

QMutex            ContentDescriptor::categoryLock;
map<uint,QString> ContentDescriptor::categoryDesc;
bool              ContentDescriptor::categoryDescExists = false;

QString myth_category_type_to_string(uint category_type)
{
    static const char *cattype[] =
        { "", "movie", "series", "sports", "tvshow", };

    if ((category_type > kCategoryNone) && (category_type < kCategoryLast))
        return QString(cattype[category_type]);

    return QString();
}

MythCategoryType string_to_myth_category_type(const QString &category_type)
{
    static const char *cattype[] =
        { "", "movie", "series", "sports", "tvshow", };

    for (uint i = 1; i < 5; i++)
        if (category_type == cattype[i])
            return (MythCategoryType) i;
    return kCategoryNone;
}

MythCategoryType ContentDescriptor::GetMythCategory(uint i) const
{
    if (0x1 == Nibble1(i))
        return kCategoryMovie;
    if (0x4 == Nibble1(i))
        return kCategorySports;
    return kCategoryTVShow;
}

QString ContentDescriptor::GetDescription(uint i) const
{
    if (!categoryDescExists)
        Init();

    QMutexLocker locker(&categoryLock);

    // Try to get detailed description
    map<uint,QString>::const_iterator it = categoryDesc.find(Nibble(i));
    if (it != categoryDesc.end())
    {
        QString ret = (*it).second;
        ret.detach();
        return ret;
    }

    // Fall back to category description
    it = categoryDesc.find(Nibble1(i)<<4);
    if (it != categoryDesc.end())
    {
        QString ret = (*it).second;
        ret.detach();
        return ret;
    }

    // Found nothing? Just return empty string.
    return "";
}

QString ContentDescriptor::toString() const
{
    QString tmp("");
    for (uint i = 0; i < Count(); i++)
        tmp += GetMythCategory(i) + " : " + GetDescription(i);
    return tmp;
}

void ContentDescriptor::Init(void)
{
    QMutexLocker locker(&categoryLock);

    if (categoryDescExists)
        return;

    categoryDesc[0x10] = QObject::tr("Movie");
    categoryDesc[0x11] = QObject::tr("Movie") + " - " +
        QObject::tr("Detective/Thriller");
    categoryDesc[0x12] = QObject::tr("Movie")+ " - " +
        QObject::tr("Adventure/Western/War");
    categoryDesc[0x13] = QObject::tr("Movie")+ " - " +
        QObject::tr("Science Fiction/Fantasy/Horror");
    categoryDesc[0x14] = QObject::tr("Movie")+ " - " +
        QObject::tr("Comedy");
    categoryDesc[0x15] = QObject::tr("Movie")+ " - " +
        QObject::tr("Soap/melodrama/folkloric");
    categoryDesc[0x16] = QObject::tr("Movie")+ " - " +
        QObject::tr("Romance");
    categoryDesc[0x17] = QObject::tr("Movie")+ " - " +
        QObject::tr("Serious/Classical/Religious/Historical Movie/Drama");
    categoryDesc[0x18] = QObject::tr("Movie")+ " - " +
        QObject::tr("Adult", "Adult Movie");

    categoryDesc[0x20] = QObject::tr("News");
    categoryDesc[0x21] = QObject::tr("News/weather report");
    categoryDesc[0x22] = QObject::tr("News magazine");
    categoryDesc[0x23] = QObject::tr("Documentary");
    categoryDesc[0x24] = QObject::tr("Intelligent Programmes");

    categoryDesc[0x30] = QObject::tr("Entertainment");
    categoryDesc[0x31] = QObject::tr("Game Show");
    categoryDesc[0x32] = QObject::tr("Variety Show");
    categoryDesc[0x33] = QObject::tr("Talk Show");

    categoryDesc[0x40] = QObject::tr("Sports");
    categoryDesc[0x41] =
        QObject::tr("Special Events (World Cup, World Series, etc)");
    categoryDesc[0x42] = QObject::tr("Sports Magazines");
    categoryDesc[0x43] = QObject::tr("Football (Soccer)");
    categoryDesc[0x44] = QObject::tr("Tennis/Squash");
    categoryDesc[0x45] =
        QObject::tr("Misc. Team Sports"); // not football/soccer
    categoryDesc[0x46] = QObject::tr("Athletics");
    categoryDesc[0x47] = QObject::tr("Motor Sport");
    categoryDesc[0x48] = QObject::tr("Water Sport");
    categoryDesc[0x49] = QObject::tr("Winter Sports");
    categoryDesc[0x4A] = QObject::tr("Equestrian");
    categoryDesc[0x4B] = QObject::tr("Martial Sports");

    categoryDesc[0x50] = QObject::tr("Kids");
    categoryDesc[0x51] = QObject::tr("Pre-School Children's Programmes");
    categoryDesc[0x52] = QObject::tr("Entertainment Programmes for 6 to 14");
    categoryDesc[0x53] = QObject::tr("Entertainment Programmes for 10 to 16");
    categoryDesc[0x54] = QObject::tr("Informational/Educational");
    categoryDesc[0x55] = QObject::tr("Cartoons/Puppets");

    categoryDesc[0x60] = QObject::tr("Music/Ballet/Dance");
    categoryDesc[0x61] = QObject::tr("Rock/Pop");
    categoryDesc[0x62] = QObject::tr("Classical Music");
    categoryDesc[0x63] = QObject::tr("Folk Music");
    categoryDesc[0x64] = QObject::tr("Jazz");
    categoryDesc[0x65] = QObject::tr("Musical/Opera");
    categoryDesc[0x66] = QObject::tr("Ballet");

    categoryDesc[0x70] = QObject::tr("Arts/Culture");
    categoryDesc[0x71] = QObject::tr("Performing Arts");
    categoryDesc[0x72] = QObject::tr("Fine Arts");
    categoryDesc[0x73] = QObject::tr("Religion");
    categoryDesc[0x74] = QObject::tr("Popular Culture/Traditional Arts");
    categoryDesc[0x75] = QObject::tr("Literature");
    categoryDesc[0x76] = QObject::tr("Film/Cinema");
    categoryDesc[0x77] = QObject::tr("Experimental Film/Video");
    categoryDesc[0x78] = QObject::tr("Broadcasting/Press");
    categoryDesc[0x79] = QObject::tr("New Media");
    categoryDesc[0x7A] = QObject::tr("Arts/Culture Magazines");
    categoryDesc[0x7B] = QObject::tr("Fashion");

    categoryDesc[0x80] = QObject::tr("Social/Policical/Economics");
    categoryDesc[0x81] = QObject::tr("Magazines/Reports/Documentary");
    categoryDesc[0x82] = QObject::tr("Economics/Social Advisory");
    categoryDesc[0x83] = QObject::tr("Remarkable People");

    categoryDesc[0x90] = QObject::tr("Education/Science/Factual");
    categoryDesc[0x91] = QObject::tr("Nature/animals/Environment");
    categoryDesc[0x92] = QObject::tr("Technology/Natural Sciences");
    categoryDesc[0x93] = QObject::tr("Medicine/Physiology/Psychology");
    categoryDesc[0x94] = QObject::tr("Foreign Countries/Expeditions");
    categoryDesc[0x95] = QObject::tr("Social/Spiritual Sciences");
    categoryDesc[0x96] = QObject::tr("Further Education");
    categoryDesc[0x97] = QObject::tr("Languages");

    categoryDesc[0xA0] = QObject::tr("Leisure/Hobbies");
    categoryDesc[0xA1] = QObject::tr("Tourism/Travel");
    categoryDesc[0xA2] = QObject::tr("Handicraft");
    categoryDesc[0xA3] = QObject::tr("Motoring");
    categoryDesc[0xA4] = QObject::tr("Fitness & Health");
    categoryDesc[0xA5] = QObject::tr("Cooking");
    categoryDesc[0xA6] = QObject::tr("Advertizement/Shopping");
    categoryDesc[0xA7] = QObject::tr("Gardening");
    // Special
    categoryDesc[0xB0] = QObject::tr("Original Language");
    categoryDesc[0xB1] = QObject::tr("Black & White");
    categoryDesc[0xB2] = QObject::tr("\"Unpublished\" Programmes");
    categoryDesc[0xB3] = QObject::tr("Live Broadcast");
    // UK Freeview custom id
    categoryDesc[0xF0] = QObject::tr("Drama");

    categoryDescExists = true;
}

QString FrequencyListDescriptor::toString() const
{
    QString str = "FrequencyListDescriptor: frequencies: ";

    for (uint i = 0; i < FrequencyCount(); i++)
        str.append(QString(" %1").arg(FrequencyHz(i)));

    return str;
}

QString ServiceDescriptorMapping::toString() const
{
    QString str = "";

    if (IsDTV())
        str.append(" (TV)");
    else if (IsDigitalAudio())
        str.append(" (Radio)");
    else if (IsHDTV())
        str.append(" (HDTV)");
    else if (IsTeletext())
        str.append(" (Teletext)");
    else
        str.append(QString(" (Unknown %1)").arg(ServiceType(),2,16));

    return str;
}

QString CableDeliverySystemDescriptor::toString() const
{
    QString str = QString("CableDeliverySystemDescriptor: ");

    str.append(QString("Frequency: %1\n").arg(FrequencyHz()));
    str.append(QString("      Mod=%1, SymbR=%2, FECInner=%3, FECOuter=%4")
        .arg(ModulationString())
        .arg(SymbolRateHz())
        .arg(FECInnerString())
        .arg(FECOuterString()));

    return str;
}

QString SatelliteDeliverySystemDescriptor::toString() const
{
    QString str = QString("SatelliteDeliverySystemDescriptor: ");

    str.append(QString("Frequency: %1\n").arg(FrequencyHz()));
    str.append(QString("      Mod=%1, SymbR=%2, FECInner=%3, Orbit=%4, Pol=%5")
        .arg(ModulationString())
        .arg(SymbolRateHz())
        .arg(FECInnerString())
        .arg(OrbitalPositionString())
        .arg(PolarizationString()));

    return str;
}

QString TerrestrialDeliverySystemDescriptor::toString() const
{
    QString str = QString("TerrestrialDeliverySystemDescriptor: ");

    str.append(QString("Frequency: %1\n").arg(FrequencyHz()));
    str.append(QString("      BW=%1k, C=%2, HP=%3, LP=%4, GI=%5, TransMode=%6k")
        .arg(BandwidthString())
        .arg(ConstellationString())
        .arg(CodeRateHPString())
        .arg(CodeRateLPString())
        .arg(GuardIntervalString())
        .arg(TransmissionModeString()));

    return str;
}

QString UKChannelListDescriptor::toString() const
{
    QString ret = "UKChannelListDescriptor sid->chan_num: ";
    for (uint i = 0; i < ChannelCount(); i++)
    {
        ret += QString("%1->%2").arg(ServiceID(i)).arg(ChannelNumber(i));
        ret += (i+1<ChannelCount()) ? ", " : "";
    }
    return ret;
}