xdstorat.cpp

pci-tv卡底层驱动源代码

        // When all chars of this packet contain all ones, it indicates the
        // end of the current program. Sec. 9.5.1.1  DX9 states that we 
        // should return S_OK and TvRatDontKnow to indicate end of program.
        if( newPID[0] == NBITS(6) && newPID[1] == NBITS(5) &&
            newPID[2] == NBITS(5) )
        {
            DBP(( "XDStoRat::decodePID got all ones packet\n" ));
            resetState();
            return S_OK;
        }
        
        // _pid.size() == 0 Indicates that this object has been 
        // reset so any valid PID received is the new PID.
        if( _pid.size() == 0 )
        {
            DBP(( "XDS pid= 0 new PID: min= %02d hr= %02d date=%02d mth=%02d\n",
                  newPID[0], newPID[1], newPID[2], newPID[3] ));
            _pid = newPID;
            return S_FALSE;
        }
        
        // Change in received PID means start of new program. 
        // DX9 states that we should return S_OK and 
        // TvRatDontKnow to indicate end of program.
        if( newPID != _pid )
        {
            DBP(( "XDS      new PID: min= %02d hr= %02d date=%02d mth=%02d\n",
                  newPID[0], newPID[1], newPID[2], newPID[3] ));
            resetState();
            _pid = newPID;
            return S_OK;
        }
    }

    // If the size is invalid or the PID has not changed return FALSE
    return S_FALSE;
}


HRESULT  
CXDSToRat::decodeProgName( std::string name )
{
    if( name.size() >= INFO_MIN_PROG_NAME && 
        name.size() <= INFO_MAX_PROG_NAME )
    {
        // _name.size() == 0 Indicates that this object has been reset so 
        // any valid Program Name received is the new Program Name.        
        if( _progName.size() == 0 )
        {
            DBP(( "XDS decodeName size = 0 new Name = %s\n", name.c_str() ));
            _progName = name;
            return S_FALSE;
        }

        // Change in received Program Name means start of new program. 
        // DX9 states that we should return S_OK and TvRatDontKnow 
        // to indicate end of program.
        if( name != _progName )
        {
            DBP(( "XDS decodeName new Name = %s\n", name.c_str() ));
            resetState();
            _progName = name;
            return S_OK;
        }
    }

    // If the size is invalid or the Program Name has not changed return FALSE
    return S_FALSE;
}


static const 
LONG VALID_USTV_ATTRIBUTES[] =
{
    0,
    0,
    US_TV_IsViolent,
    0,
    US_TV_IsViolent | US_TV_IsSexualSituation | 
    US_TV_IsAdultLanguage | US_TV_IsSexuallySuggestiveDialog,
    US_TV_IsViolent | US_TV_IsSexualSituation | 
    US_TV_IsAdultLanguage | US_TV_IsSexuallySuggestiveDialog,
    US_TV_IsViolent | US_TV_IsSexualSituation | US_TV_IsAdultLanguage,
    0
};


HRESULT  
CXDSToRat::decodeContAdv( BYTE                   char1,
                          BYTE                   char2,
                          bool                   arg2IsValid,
                          EnTvRat_System        *p_system, 
                          EnTvRat_GenericLevel  *p_level, 
                          LONG                  *p_attrib )
{
    if( (char1 & BIT(3)) == 0 ) // MPA Rating system
    {
        EnTvRat_MPAA level;

        // For MPA the rating is in the low order three bits of char 1        
        switch( char1 & NBITS(3) )
        {
        case 0: level = MPAA_NotApplicable; break;
        case 1: level = MPAA_G;             break;
        case 2: level = MPAA_PG;            break;
        case 3: level = MPAA_PG13;          break;
        case 4: level = MPAA_R;             break;
        case 5: level = MPAA_NC17;          break;
        case 6: level = MPAA_X;             break;
        case 7: level = MPAA_NotRated;      break;
        }

        // Return the decoded rating as per DX9 SDK.
        DBP(( "XDS rating MPA lev = %x\n", level )); 
        *p_system = MPAA;
        *p_level  = (EnTvRat_GenericLevel)level;
        *p_attrib = BfAttrNone; // Not used by MPA
        return S_OK;
    }
    else if( !arg2IsValid ) // If not MPA, char2 must be valid.
    {
        return S_FALSE;
    }
    else if( (char1 & BIT(4)) == 0 ) // U.S. TV Rating system
    {
        EnTvRat_US_TV level;

        // For U.S. TV the rating is in the low order three bits of char 2
        switch( char2 & NBITS(3) )
        {
        case 0: level = US_TV_None;  break;
        case 1: level = US_TV_Y;     break;
        case 2: level = US_TV_Y7;    break;
        case 3: level = US_TV_G;     break;
        case 4: level = US_TV_PG;    break;
        case 5: level = US_TV_14;    break;
        case 6: level = US_TV_MA;    break;

        // For some reason, Media Center treats value 7 differently from 0.
        // So even if a user checks the "block unrated showTV programs",
        // the program is still being shown, whereas a VChip TV will block it.
        // The workaround is to make this value to behave the same as 0.
        case 7: level = US_TV_None;  break;
        }

        // U.S. TV uses Content Attributes per EIA/CEA-608-B Sec. 9.5.1.5.1
        LONG attrib = char1 & BIT(5) ? US_TV_IsSexuallySuggestiveDialog : 0;
        attrib     |= char2 & BIT(3) ? US_TV_IsAdultLanguage            : 0;
        attrib     |= char2 & BIT(4) ? US_TV_IsSexualSituation          : 0;
        attrib     |= char2 & BIT(5) ? US_TV_IsViolent                  : 0;

        // Only certain combinations of ratings and attributes are allowed
        attrib &= VALID_USTV_ATTRIBUTES[char2 & NBITS(3)];

        // Return the decoded rating as per DX9 SDK.
        DBP(( "XDS rating US_TV lev = %x atr = %x\n", level, attrib ));
        *p_system = US_TV;
        *p_level  = (EnTvRat_GenericLevel)level;
        *p_attrib = attrib;
        return S_OK;
    }
    else if( (char1 & BIT(5)) == 0 && (char2 & BIT(3)) == 0 ) // Canadian Engli
    {
        EnTvRat_CAE_TV level;

        // Canadian English rating is in the low order 3 bits of char 2
        switch( char2 & NBITS(3) )
        {
        case 0: level = CAE_TV_Exempt; break;
        case 1: level = CAE_TV_C;      break;
        case 2: level = CAE_TV_C8;     break;
        case 3: level = CAE_TV_G;      break;
        case 4: level = CAE_TV_PG;     break;
        case 5: level = CAE_TV_14;     break;
        case 6: level = CAE_TV_18;     break;
        case 7: return S_FALSE; // Rating == 7 is invalid Sec. 9.5.1.5.2
        }

        // Return the decoded rating as per DX9 SDK.
        DBP(( "XDS CAE rate lev = %x\n", level ));
        *p_system = Canadian_English;
        *p_level  = (EnTvRat_GenericLevel)level;
        *p_attrib = BfAttrNone; // Not used by Canadian English
        return S_OK;
    }
    else if( char1 & BIT(5) && (char2 & BIT(3)) == 0 ) // Canadian French
    {
        EnTvRat_CAF_TV level;

        // Canadian French rating is in the low order 3 bits of char 2
        switch( char2 & NBITS(3) )
        {
        case 0: level = CAF_TV_Exempt; break;
        case 1: level = CAF_TV_G;      break;
        case 2: level = CAF_TV_8;      break;
        case 3: level = CAF_TV_13;     break;
        case 4: level = CAF_TV_16;     break;
        case 5: level = CAF_TV_18;     break;
        default: return S_FALSE; // Rating == 6 or 7 is invalid Sec. 9.5.1.5.3
        }

        // Return the decoded rating as per DX9 SDK.
        DBP(( "XDS CAF rate lev = %x\n", level ));
        *p_system = Canadian_French;
        *p_level  = (EnTvRat_GenericLevel)level;
        *p_attrib = BfAttrNone; // Not used by Canadian French
        return S_OK;
    }
    else  // Reserved for non-U.S. & non-Canadian system
        return S_FALSE; 
}


void CXDSToRat::resetState()
{	
    // When we get an indication of the end of a program, or when a 
    // discontinuity occurs we need to reset our internal state.
    _p_receivingPkt = NULL;
    _xdsPackets.clear();
    _pid.resize( 0 );
    _progName.resize( 0 );
}