/** Determines which delivery system to use. */
static const delsys_t *GuessSystem (const char *scheme, dvb_device_t *dev)
{
/* NOTE: We should guess the delivery system for the "cable", "satellite"
* and "terrestrial" shortcuts (i.e. DVB, ISDB, ATSC...). But there is
* seemingly no sane way to do get the info with Linux DVB version 5.2.
* In particular, the frontend infos distinguish only the modulator class
* (QPSK, QAM, OFDM or ATSC).
*
* Furthermore, if the demodulator supports 2G, we cannot guess whether
* 1G or 2G is intended. For backward compatibility, 1G is assumed
* (this is not a limitation of Linux DVB). We will probably need something
* smarter when 2G (semi automatic) scanning is implemented. */
if (!strcasecmp (scheme, "cable"))
scheme = "dvb-c";
else
if (!strcasecmp (scheme, "satellite"))
scheme = "dvb-s";
else
if (!strcasecmp (scheme, "terrestrial"))
scheme = "dvb-t";
if (!strcasecmp (scheme, "atsc"))
return &atsc;
if (!strcasecmp (scheme, "cqam"))
return &cqam;
if (!strcasecmp (scheme, "dvb-c"))
return &dvbc;
if (!strcasecmp (scheme, "dvb-s"))
return &dvbs;
if (!strcasecmp (scheme, "dvb-s2"))
return &dvbs2;
if (!strcasecmp (scheme, "dvb-t"))
return &dvbt;
if (!strcasecmp (scheme, "dvb-t2"))
return &dvbt2;
if (!strcasecmp (scheme, "isdb-c"))
return &isdbc;
if (!strcasecmp (scheme, "isdb-s"))
return &isdbs;
if (!strcasecmp (scheme, "isdb-t"))
return &isdbt;
unsigned systems = dvb_enum_systems (dev);
if (systems & ATSC)
return &atsc;
if (systems & DVB_C)
return &dvbc;
if (systems & DVB_S)
return &dvbc;
if (systems & DVB_T)
return &dvbt;
return NULL;
}
/** Determines which delivery system to use. */
static const delsys_t *GuessSystem (const char *scheme, dvb_device_t *dev)
{
/* Specific delivery system is specified */
if (!strcasecmp (scheme, "atsc"))
return &atsc;
if (!strcasecmp (scheme, "cqam"))
return &cqam;
if (!strcasecmp (scheme, "dvb-c"))
return &dvbc;
if (!strcasecmp (scheme, "dvb-s"))
return &dvbs;
if (!strcasecmp (scheme, "dvb-s2"))
return &dvbs2;
if (!strcasecmp (scheme, "dvb-t"))
return &dvbt;
if (!strcasecmp (scheme, "dvb-t2"))
return &dvbt2;
if (!strcasecmp (scheme, "isdb-c"))
return &isdbc;
if (!strcasecmp (scheme, "isdb-s"))
return &isdbs;
if (!strcasecmp (scheme, "isdb-t"))
return &isdbt;
/* If the demodulator supports 2G, we cannot guess whether
* 1G or 2G is intended. For backward compatibility, 1G is assumed
* (this is not a limitation of Linux DVB). We will probably need something
* smarter when 2G (semi automatic) scanning is implemented. */
unsigned systems = dvb_enum_systems (dev);
/* Only wave carrier is specified */
if (!strcasecmp (scheme, "cable"))
{
if (systems & DVB_C)
return &dvbc;
if (systems & CQAM)
return &cqam;
if (systems & ISDB_C)
return &isdbc;
}
if (!strcasecmp (scheme, "satellite"))
{
if (systems & DVB_S)
return &dvbs;
if (systems & ISDB_S)
return &isdbs;
}
if (!strcasecmp (scheme, "terrestrial"))
{
if (systems & DVB_T)
return &dvbc;
if (systems & ATSC)
return &cqam;
if (systems & ISDB_T)
return &isdbt;
}
/* Only standards family or nothing is specified */
if (systems & DVB_C)
return &dvbc;
if (systems & DVB_S)
return &dvbs;
if (systems & DVB_T)
return &dvbt;
if (systems & ATSC)
return &atsc;
return NULL;
}