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#include <lib/base/eerror.h>
#include <lib/dvb/radiotext.h>
#include <lib/dvb/idemux.h>
#include <lib/gdi/gpixmap.h>
DEFINE_REF(eDVBRadioTextParser);
eDVBRadioTextParser::eDVBRadioTextParser(iDVBDemux *demux)
:bytesread(0), ptr(0), p1(-1), p2(-1), msgPtr(0), state(0)
{
setStreamID(0xC0, 0xC0);
if (demux->createPESReader(eApp, m_pes_reader))
eDebug("failed to create PES reader!");
else
m_pes_reader->connectRead(slot(*this, &eDVBRadioTextParser::processData), m_read_connection);
}
#define SWAP(x) ((x<<8)|(x>>8))
#define LO(x) (x&0xFF)
static inline unsigned short crc_ccitt_byte( unsigned short crc, unsigned char c )
{
crc = SWAP(crc) ^ c;
crc = crc ^ (LO(crc) >> 4);
crc = crc ^ (SWAP(LO(crc)) << 4) ^ (LO(crc) << 5);
return crc;
}
static int bitrate[3][3][16] = {
{
// MPEG-2, L3
{-1,8000,16000,24000,32000,40000,48000,56000,64000,80000,96000,112000,128000,144000,160000,0},
// MPEG-2, L2
{-1,8000,16000,24000,32000,40000,48000,56000,64000,80000,96000,112000,128000,144000,160000,0},
// MPEG-2, L1
{-1,32000,48000,56000,64000,80000,96000,112000,128000,144000,160000,176000,192000,224000,256000,0}
},
{
// MPEG-1, L3
{-1,32000,40000,48000,56000,64000,80000,96000,112000,128000,160000,192000,224000,256000,320000,0},
// MPEG-1, L2
{-1,32000,48000,56000,64000,80000,96000,112000,128000,160000,192000,224000,256000,320000,384000,0},
// MPEG-1, L1
{-1,32000,64000,96000,128000,160000,192000,224000,256000,288000,320000,352000,384000,416000,448000,0}
},
{
//MPEG-2.5, L3??
{-1,6000,8000,10000,12000,16000,20000,24000,28000,320000,40000,48000,56000,64000,80000,0},
//MPEG-2.5, L2
{-1,6000,8000,10000,12000,16000,20000,24000,28000,320000,40000,48000,56000,64000,80000,0},
//MPEG-2.5, L1
{-1,8000,12000,16000,20000,24000,32000,40000,48000,560000,64000,80000,96000,112000,128000,0}
}
};
static int frequency[3][4] = {
// MPEG2 - 22.05, 24, 16khz
{ 22050,24000,16000,0 },
// MPEG1 - 44.1, 48, 32khz
{ 44100,48000,32000,0 },
// MPEG2.5 - 11.025, 12, 8khz
{ 11025,12000,8000,0 }
};
void eDVBRadioTextParser::connectUpdatedRadiotext(const Slot0<void> &slot, ePtr<eConnection> &connection)
{
connection = new eConnection(this, m_updated_radiotext.connect(slot));
}
void eDVBRadioTextParser::processPESPacket(__u8 *data, int len)
{
int pos=9+data[8];// skip pes header
while (pos < len)
{
if ((0xFF & data[pos]) != 0xFF || (0xF0 & data[pos + 1]) != 0xF0)
return;
int padding_bit = (data[pos + 2]>>1) & 1;
int mode = (data[pos + 3]>>6) & 3;
int channel = mode == 3 ? 1 : 2;
int id = (data[pos + 1] >> 3) & 1;
int emphasis_bit = data[pos + 3] & 3;
int protection_bit = data[pos + 1] & 1;
int rate = -1;
int sample_freq = -1;
int layer = -1;
if (emphasis_bit == 2 && id == 1 )
id = 2;
if ((layer = (data[pos + 1]>>1) & 3) < 1)
return;
if ((rate = bitrate[id][layer - 1][(data[pos + 2]>>4) & 0xf]) < 1)
return;
if ((sample_freq = frequency[id][(data[pos + 2]>>2) & 3]) == 0)
return;
if (id == 1 && layer == 2)
{
if (rate / channel < 32000)
return;
if (rate / channel > 192000)
return;
}
int frame_size = layer < 3 ?
(144 * rate / sample_freq) + padding_bit :
((12 * rate / sample_freq) * 4) + (4 * padding_bit);
pos += frame_size;
#if 0
// eDebug("protection_bit ? %d", protection_bit);
// int offs = protection_bit ? pos - 1 : pos - 3;
// if (data[offs] != 0xFD)
// offs += 2;
// eDebug("%02x %02x %02x %02x %02x", data[offs-2], data[offs-1], data[offs], data[offs+1], data[offs+2]);
#else
int offs = pos - 1;
#endif
if (data[offs] == 0xFD)
{
int ancillary_len = 1 + data[offs - 1];
offs -= ancillary_len;
while(offs < pos)
gotAncillaryByte(data[offs++]);
}
}
}
void eDVBRadioTextParser::gotAncillaryByte(__u8 data)
{
buf[bytesread]=data;
bytesread+=1;
if ( bytesread == 128 )
{
while(ptr<128)
{
if ( buf[ptr] == 0xFD )
{
if (p1 == -1)
p1 = ptr;
else
p2 = ptr;
}
if ( p1 != -1 && p2 != -1 )
{
int cnt=buf[--p2];
while ( cnt-- > 0 )
{
unsigned char c = buf[--p2];
if ( state == 1 )
crc=0xFFFF;
if ( state >= 1 && state < 11 )
crc = crc_ccitt_byte(crc, c);
switch (state)
{
case 0:
if ( c==0xFE ) // Startkennung
state=1;
break;
case 1: // 10bit Site Address + 6bit Encoder Address
case 2:
case 3: // Sequence Counter
++state;
break;
case 4:
leninfo=c;
++state;
break;
case 5:
if ( c==0x0A ) // message element code 0x0A Radio Text
++state;
else
state=0;
break;
case 6: // Data Set Number ... ignore
case 7: // Program Service Number ... ignore
++state;
break;
case 8: // Message Element Length
todo=c;
if ( !todo || todo > 65 || todo > leninfo-4)
state=0;
else
{
++state;
todo-=2;
msgPtr=0;
}
break;
case 9: // Radio Text Status bit:
// 0 = AB-flagcontrol
// 1-4 = Transmission-Number
// 5-6 = Buffer-Config
++state; // ignore ...
break;
case 10:
// TODO build a complete radiotext charcode to UTF8 conversion table for all character > 0x80
switch (c)
{
case 0 ... 0x7f: break;
case 0x8d: c='ß'; break;
case 0x91: c='ä'; break;
case 0xd1: c='Ä'; break;
case 0x97: c='ö'; break;
case 0xd7: c='Ö'; break;
case 0x99: c='ü'; break;
case 0xd9: c='Ü'; break;
default: c=' '; break; // convert all unknown to space
}
message[msgPtr++]=c;
if(todo)
--todo;
else
++state;
break;
case 11:
crc16=c<<8;
++state;
break;
case 12:
crc16|=c;
message[msgPtr--]=0;
while(message[msgPtr] == ' ' && msgPtr > 0)
message[msgPtr--] = 0;
if ( crc16 == (crc^0xFFFF) )
{
eDebug("radiotext: (%s)", message);
/*emit*/ m_updated_radiotext();
}
else
eDebug("invalid radiotext crc (%s)", message);
state=0;
break;
}
}
p1=ptr;
p2=-1;
}
++ptr;
}
if (p1 != -1 && (128-p1) != 128)
{
bytesread=ptr=128-p1;
memcpy(buf, buf+p1, ptr);
p1=0;
}
else
bytesread=ptr=0;
}
}
int eDVBRadioTextParser::start(int pid)
{
if (m_pes_reader)
return m_pes_reader->start(pid);
else
return -1;
}
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