dvbchannel.cpp File Reference

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Functions
static void	drain_dvb_events (int fd)
	Reads all the events off the queue, so we can use select in wait_for_backend(int,int).
static bool	wait_for_backend (int fd, int timeout_ms)
	Waits for backend to get tune message.
static struct dvb_frontend_parameters	dtvmultiplex_to_dvbparams (DTVTunerType, const DTVMultiplex &, int intermediate_freq, bool can_fec_auto)
static DTVMultiplex	dvbparams_to_dtvmultiplex (DTVTunerType, const dvb_frontend_parameters &)
static struct dtv_properties *	dtvmultiplex_to_dtvproperties (DTVTunerType tuner_type, const DTVMultiplex &tuning, int intermediate_freq, bool can_fec_auto, bool do_tune=true)

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Function Documentation

static void drain_dvb_events

(

int

fd

)

[static]

Reads all the events off the queue, so we can use select in wait_for_backend(int,int).

Definition at line 1158 of file dvbchannel.cpp.

Referenced by DVBChannel::Tune().

static bool wait_for_backend	(	int	fd,
		int	timeout_ms
	)			[static]

Waits for backend to get tune message.

With linux 2.6.12 or later this should block until the backend is tuned to the proper frequency.

With earlier kernels sleeping for timeout_ms may save us.

Waiting for DVB events has been tried, but this fails with several DVB cards. They either don't send the required events or delete them from the event queue before we can read the event.

Using a FE_GET_FRONTEND has also been tried, but returns the old data until a 2 sec timeout elapses on at least one DVB card.

We do not block until we have a lock, the signal monitor does that.

Parameters:

	fd	frontend file descriptor
	timeout_ms	timeout before FE_READ_STATUS in milliseconds

Definition at line 1192 of file dvbchannel.cpp.

Referenced by DVBChannel::Tune().

static struct dvb_frontend_parameters dtvmultiplex_to_dvbparams	(	DTVTunerType	tuner_type,
		const DTVMultiplex &	tuning,
		int	intermediate_freq,
		bool	can_fec_auto
	)			[static, read]

Definition at line 1229 of file dvbchannel.cpp.

Referenced by DVBChannel::Tune().

static DTVMultiplex dvbparams_to_dtvmultiplex	(	DTVTunerType	tuner_type,
		const dvb_frontend_parameters &	params
	)			[static]

Definition at line 1293 of file dvbchannel.cpp.

Referenced by DVBChannel::ProbeTuningParams().

static struct dtv_properties* dtvmultiplex_to_dtvproperties	(	DTVTunerType	tuner_type,
		const DTVMultiplex &	tuning,
		int	intermediate_freq,
		bool	can_fec_auto,
		bool	do_tune = true
	)			[static, read]

Definition at line 523 of file dvbchannel.cpp.

Referenced by DVBChannel::Tune().