lib/dvb/radiotext.cpp

   1 #include <lib/base/eerror.h>
   2 #include <lib/dvb/radiotext.h>
   3 #include <lib/dvb/idemux.h>
   4 #include <lib/gdi/gpixmap.h>
   5
   6 DEFINE_REF(eDVBRadioTextParser);
   7
   8 eDVBRadioTextParser::eDVBRadioTextParser(iDVBDemux *demux)
   9         :bytesread(0), ptr(0), p1(-1), p2(-1), msgPtr(0), state(0)
  10 {
  11         setStreamID(0xC0, 0xC0);
  12
  13         if (demux->createPESReader(eApp, m_pes_reader))
  14                 eDebug("failed to create PES reader!");
  15         else
  16                 m_pes_reader->connectRead(slot(*this, &eDVBRadioTextParser::processData), m_read_connection);
  17 }
  18
  19 #define SWAP(x) ((x<<8)|(x>>8))
  20 #define LO(x)   (x&0xFF)
  21
  22 static inline unsigned short crc_ccitt_byte( unsigned short crc, unsigned char c )
  23 {
  24         crc = SWAP(crc) ^ c;
  25         crc = crc ^ (LO(crc) >> 4);
  26         crc = crc ^ (SWAP(LO(crc)) << 4) ^ (LO(crc) << 5);
  27         return crc;
  28 }
  29
  30 static int bitrate[3][3][16] = {
  31         {
  32                 // MPEG-2, L3
  33                 {-1,8000,16000,24000,32000,40000,48000,56000,64000,80000,96000,112000,128000,144000,160000,0},
  34                 // MPEG-2, L2
  35                 {-1,8000,16000,24000,32000,40000,48000,56000,64000,80000,96000,112000,128000,144000,160000,0},
  36                 // MPEG-2, L1
  37                 {-1,32000,48000,56000,64000,80000,96000,112000,128000,144000,160000,176000,192000,224000,256000,0}
  38         },
  39         {
  40                 // MPEG-1, L3
  41                 {-1,32000,40000,48000,56000,64000,80000,96000,112000,128000,160000,192000,224000,256000,320000,0},
  42                 // MPEG-1, L2
  43                 {-1,32000,48000,56000,64000,80000,96000,112000,128000,160000,192000,224000,256000,320000,384000,0},
  44                 // MPEG-1, L1
  45                 {-1,32000,64000,96000,128000,160000,192000,224000,256000,288000,320000,352000,384000,416000,448000,0}
  46         },
  47         {
  48                 //MPEG-2.5, L3??
  49                 {-1,6000,8000,10000,12000,16000,20000,24000,28000,320000,40000,48000,56000,64000,80000,0},
  50                 //MPEG-2.5, L2
  51                 {-1,6000,8000,10000,12000,16000,20000,24000,28000,320000,40000,48000,56000,64000,80000,0},
  52                 //MPEG-2.5, L1
  53                 {-1,8000,12000,16000,20000,24000,32000,40000,48000,560000,64000,80000,96000,112000,128000,0}
  54         }
  55 };
  56
  57 static int frequency[3][4] = {
  58         // MPEG2 - 22.05, 24, 16khz
  59         { 22050,24000,16000,0 },
  60         // MPEG1 - 44.1, 48, 32khz
  61         { 44100,48000,32000,0 },
  62         // MPEG2.5 - 11.025, 12, 8khz
  63         { 11025,12000,8000,0 }
  64 };
  65
  66 void eDVBRadioTextParser::connectUpdatedRadiotext(const Slot0<void> &slot, ePtr<eConnection> &connection)
  67 {
  68         connection = new eConnection(this, m_updated_radiotext.connect(slot));
  69 }
  70
  71 void eDVBRadioTextParser::processPESPacket(__u8 *data, int len)
  72 {
  73         int pos=9+data[8];// skip pes header
  74
  75         while (pos < len)
  76         {
  77                 if ((0xFF & data[pos]) != 0xFF || (0xF0 & data[pos + 1]) != 0xF0)
  78                         return;
  79
  80                 int padding_bit = (data[pos + 2]>>1) & 1;
  81                 int mode = (data[pos + 3]>>6) & 3;
  82                 int channel = mode == 3 ? 1 : 2;
  83                 int id = (data[pos + 1] >> 3) & 1;
  84                 int emphasis_bit = data[pos + 3] & 3;
  85                 int protection_bit = data[pos + 1] & 1;
  86                 int rate = -1;
  87                 int sample_freq = -1;
  88                 int layer = -1;
  89
  90                 if (emphasis_bit == 2 && id == 1 )
  91                         id = 2;
  92
  93                 if ((layer = (data[pos + 1]>>1) & 3) < 1)
  94                         return;
  95
  96                 if ((rate = bitrate[id][layer - 1][(data[pos + 2]>>4) & 0xf]) < 1)
  97                         return;
  98
  99                 if ((sample_freq = frequency[id][(data[pos + 2]>>2) & 3]) == 0)
 100                         return;
 101
 102                 if (id == 1 && layer == 2)
 103                 {
 104                         if (rate / channel < 32000)
 105                                 return;
 106                         if (rate / channel > 192000)
 107                                 return;
 108                 }
 109
 110                 int frame_size = layer < 3 ?
 111                         (144 * rate / sample_freq) + padding_bit :
 112                         ((12 * rate / sample_freq) * 4) + (4 * padding_bit);
 113
 114                 pos += frame_size;
 115
 116                 int offs = protection_bit ? pos - 1 : pos - 3;
 117                 if (data[offs] == 0xFD)
 118                 {
 119                         int ancillary_len = 1 + data[offs - 1];
 120                         offs -= ancillary_len;
 121                         while(offs < pos)
 122                                 gotAncillaryByte(data[offs++]);
 123                 }
 124         }
 125 }
 126
 127 void eDVBRadioTextParser::gotAncillaryByte(__u8 data)
 128 {
 129         buf[bytesread]=data;
 130         bytesread+=1;
 131         if ( bytesread == 128 )
 132         {
 133                 while(ptr<128)
 134                 {
 135                         if ( buf[ptr] == 0xFD )
 136                         {
 137                                 if (p1 == -1)
 138                                         p1 = ptr;
 139                                 else
 140                                         p2 = ptr;
 141                         }
 142                         if ( p1 != -1 && p2 != -1 )
 143                         {
 144                                 int cnt=buf[--p2];
 145                                 while ( cnt-- > 0 )
 146                                 {
 147                                         unsigned char c = buf[--p2];
 148                                         if ( state == 1 )
 149                                                 crc=0xFFFF;
 150                                         if ( state >= 1 && state < 11 )
 151                                                 crc = crc_ccitt_byte(crc, c);
 152
 153                                         switch (state)
 154                                         {
 155                                                 case 0:
 156                                                         if ( c==0xFE )  // Startkennung
 157                                                                 state=1;
 158                                                         break;
 159                                                 case 1: // 10bit Site Address + 6bit Encoder Address
 160                                                 case 2:
 161                                                 case 3: // Sequence Counter
 162                                                         ++state;
 163                                                         break;
 164                                                 case 4:
 165                                                         leninfo=c;
 166                                                         ++state;
 167                                                         break;
 168                                                 case 5:
 169                                                         if ( c==0x0A ) // message element code 0x0A Radio Text
 170                                                                 ++state;
 171                                                         else
 172                                                                 state=0;
 173                                                         break;
 174                                                 case 6: // Data Set Number ... ignore
 175                                                 case 7: // Program Service Number ... ignore
 176                                                         ++state;
 177                                                         break;
 178                                                 case 8: // Message Element Length
 179                                                         todo=c;
 180                                                         if ( !todo || todo > 65 || todo > leninfo-4)
 181                                                                 state=0;
 182                                                         else
 183                                                         {
 184                                                                 ++state;
 185                                                                 todo-=2;
 186                                                                 msgPtr=0;
 187                                                         }
 188                                                         break;
 189                                                 case 9: // Radio Text Status bit:
 190                                                         // 0   = AB-flagcontrol
 191                                                         // 1-4 = Transmission-Number
 192                                                         // 5-6 = Buffer-Config
 193                                                         ++state; // ignore ...
 194                                                         break;
 195                                                 case 10:
 196         // TODO build a complete radiotext charcode to UTF8 conversion table for all character > 0x80
 197                                                         switch (c)
 198                                                         {
 199                                                                 case 0 ... 0x7f: break;
 200                                                                 case 0x8d: c='ß'; break;
 201                                                                 case 0x91: c='ä'; break;
 202                                                                 case 0xd1: c='Ä'; break;
 203                                                                 case 0x97: c='ö'; break;
 204                                                                 case 0xd7: c='Ö'; break;
 205                                                                 case 0x99: c='ü'; break;
 206                                                                 case 0xd9: c='Ü'; break;
 207                                                                 default: c=' '; break;  // convert all unknown to space
 208                                                         }
 209                                                         message[msgPtr++]=c;
 210                                                         if(todo)
 211                                                                 --todo;
 212                                                         else
 213                                                                 ++state;
 214                                                         break;
 215                                                 case 11:
 216                                                         crc16=c<<8;
 217                                                         ++state;
 218                                                         break;
 219                                                 case 12:
 220                                                         crc16|=c;
 221                                                         message[msgPtr--]=0;
 222                                                         while(message[msgPtr] == ' ' && msgPtr > 0)
 223                                                                 message[msgPtr--] = 0;
 224                                                         if ( crc16 == (crc^0xFFFF) )
 225                                                         {
 226                                                                 eDebug("radiotext: (%s)", message);
 227                                                                 /*emit*/ m_updated_radiotext();
 228                                                         }
 229                                                         else
 230                                                                 eDebug("invalid radiotext crc (%s)", message);
 231                                                         state=0;
 232                                                         break;
 233                                         }
 234                                 }
 235                                 p1=ptr;
 236                                 p2=-1;
 237                         }
 238                         ++ptr;
 239                 }
 240                 if (p1 != -1 && (128-p1) != 128)
 241                 {
 242                         bytesread=ptr=128-p1;
 243                         memcpy(buf, buf+p1, ptr);
 244                         p1=0;
 245                 }
 246                 else
 247                         bytesread=ptr=0;
 248         }
 249 }
 250
 251 int eDVBRadioTextParser::start(int pid)
 252 {
 253         if (m_pes_reader)
 254                 return m_pes_reader->start(pid);
 255         else
 256                 return -1;
 257 }
 258