Digital TV tuner emulator. More...

#include <tsTunerEmulator.h>

Inheritance diagram for ts::TunerEmulator:

Collaboration diagram for ts::TunerEmulator:

[legend]

Public Member Functions
	TunerEmulator (DuckContext &duck)
	Constructor.

virtual	~TunerEmulator () override
	Destructor.

virtual void	abort (bool silent=false)
	Abort any pending or blocked reception.

virtual bool	close (bool silent=false) override
	Close the tuner.

virtual const DeliverySystemSet &	deliverySystems () const override
	Set of delivery systems which are supported by the tuner.

virtual UString	deviceInfo () const override
	Device-specific information.

virtual UString	deviceName () const override
	Get the device name of the tuner.

virtual UString	devicePath () const override
	System-specific device path (for information only).

virtual std::ostream &	displayStatus (std::ostream &strm, const UString &margin=UString(), bool extended=false) override
	Display the characteristics and status of the tuner.

virtual bool	getCurrentTuning (ModulationArgs &params, bool reset_unknown) override
	Get the current tuning parameters.

virtual bool	getSignalState (SignalState &state) override
	Check if a signal is present and get the signal state.

virtual bool	infoOnly () const override
	Get the open mode.

virtual bool	isOpen () const override
	Check if the tuner is open.

virtual bool	open (const UString &device_name, bool info_only) override
	Open the tuner.

virtual size_t	receive (TSPacket buffer, size_t max_packets, const AbortInterface abort=nullptr) override
	Receive packets.

virtual cn::milliseconds	receiveTimeout () const
	Get the timeout for receive operation.

Report &	report () const
	Get a reference to the error report.

virtual void	setDemuxBufferSize (size_t s)
	Set the demux buffer size in bytes (Linux-specific).

virtual void	setReceiverFilterName (const UString &name)
	Specify a receiver filter name (Windows-specific).

virtual bool	setReceiveTimeout (cn::milliseconds t)
	Set the timeout for receive operations.

virtual void	setSignalPoll (cn::milliseconds t)
	Set the poll interval for signal timeout (Linux-specific).

virtual void	setSignalTimeout (cn::milliseconds t)
	Set the timeout before getting a signal on start.

virtual void	setSignalTimeoutSilent (bool silent)
	Set if an error should be reported on timeout before getting a signal on start.

virtual void	setSinkQueueSize (size_t s)
	Set the max number of queued media samples (Windows-specific).

virtual bool	start () override
	Start receiving packets.

virtual bool	stop (bool silent=false) override
	Stop receiving packets.

virtual bool	tune (ModulationArgs &params) override
	Tune to the specified parameters.

Static Public Member Functions
static bool	GetAllTuners (DuckContext &duck, TunerPtrVector &tuners)
	Get the list of all existing physical tuners.

Static Public Attributes
static constexpr size_t	DEFAULT_DEMUX_BUFFER_SIZE = 1024 * 1024
	Default demux buffer size in bytes (Linux-specific).

static constexpr cn::milliseconds	DEFAULT_SIGNAL_POLL = cn::milliseconds(100)
	Default poll interval for signal timeout (Linux-specific).

static constexpr cn::milliseconds	DEFAULT_SIGNAL_TIMEOUT = cn::seconds(5)
	Default timeout before getting a signal on start.

static constexpr size_t	DEFAULT_SINK_QUEUE_SIZE = 1000
	Default max number of queued media samples (Windows-specific).

Protected Member Functions
bool	checkTuneParameters (ModulationArgs &params) const
	Check the consistency of tune() parameters.

bool	unimplemented () const
	Helper for unimplemented methods.

Protected Attributes
DuckContext &	_duck
	TSDuck execution context for subclasses.

Detailed Description

Digital TV tuner emulator.

A tuner emulator implements the TunerBase interface without physical tuner. The "device name" is the name of an XML file which describes the tuner configuration.

A tuner configuration contains a list of frequencies. The "tuner" can tune around each of these frequencies (center frequency with a given bandwidth). Each frequency is associated with a TS file. When the emulated tuner is tuned to a valid frequency, the reception is emulated by reading packets from the associated TS file again and again.

Sample XML tuner emulator configuration:

<?xml version="1.0" encoding="UTF-8"?>
<tsduck>
  <defaults delivery="DVB-T" bandwidth="4,000,000" directory="/home/user/streams"/>
  <channel frequency="474,000,000" file="mux1.ts"/>
  <channel frequency="482,000,000" file="mux2.ts"/>
  <channel frequency="490,000,000" file="mux3.ts"/>
  <channel frequency="498,000,000" file="mux4.ts"/>
  <channel frequency="506,000,000" file="mux5.ts"/>
  <channel frequency="514,000,000" file="mux6.ts"/>
  <channel frequency="522,000,000" file="mux7.ts"/>
  <channel frequency="530,000,000" file="mux8.ts" delivery="DVB-T2" bandwidth="6,000,000"/>
</tsduck>

Sample tuning test using this tuner emulator. The various TS files are read as if they were actual muxes:

tsscan -d etuner.xml --uhf-band --first-channel 21 --last-channel 28 --service-list

Constructor & Destructor Documentation

◆ TunerEmulator()

ts::TunerEmulator::TunerEmulator ( DuckContext & duck )

Constructor.

Parameters

[in,out] duck TSDuck execution context.

Member Function Documentation

◆ open()

virtual bool ts::TunerEmulator::open	(	const UString &	device_name,
		bool	info_only
	)

overridevirtual

Open the tuner.

Parameters

[in]	device_name	Tuner device name. If name is empty, use "first" or "default" tuner.
[in]	info_only	If true, we will only fetch the properties of the tuner, we won't use it to receive streams. Thus, it is possible to open tuners which are already used to actually receive a stream.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ close()

virtual bool ts::TunerEmulator::close ( bool silent = false )

overridevirtual

Close the tuner.

Parameters

[in] silent When true, do not report close errors.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ isOpen()

virtual bool ts::TunerEmulator::isOpen ( ) const

overridevirtual

Check if the tuner is open.

Returns: True if the tuner is open.

Reimplemented from ts::TunerBase.

◆ infoOnly()

virtual bool ts::TunerEmulator::infoOnly ( ) const

overridevirtual

Get the open mode.

Returns: True if the tuner is open to fetch information only. In that case, the tuner cannot receive streams.

Reimplemented from ts::TunerBase.

◆ deliverySystems()

virtual const DeliverySystemSet & ts::TunerEmulator::deliverySystems ( ) const

overridevirtual

Set of delivery systems which are supported by the tuner.

Returns: A constant reference to the set of delivery systems which are supported by the tuner.

Reimplemented from ts::TunerBase.

◆ deviceName()

virtual UString ts::TunerEmulator::deviceName ( ) const

overridevirtual

Get the device name of the tuner.

Returns: The device name of the tuner.

Reimplemented from ts::TunerBase.

◆ deviceInfo()

virtual UString ts::TunerEmulator::deviceInfo ( ) const

overridevirtual

Device-specific information.

Returns: A string with device-specific information. Can be empty.

Reimplemented from ts::TunerBase.

◆ devicePath()

virtual UString ts::TunerEmulator::devicePath ( ) const

overridevirtual

System-specific device path (for information only).

Returns: A string with system-specific device path. Can be empty.

Reimplemented from ts::TunerBase.

◆ getSignalState()

virtual bool ts::TunerEmulator::getSignalState ( SignalState & state )

overridevirtual

Check if a signal is present and get the signal state.

Parameters

[out] state Returned state of the tuner. Some fields may be unset if unavailable with that tuner.

Returns: True in case of success (even if no signal was detected), false on error.

Reimplemented from ts::TunerBase.

◆ tune()

virtual bool ts::TunerEmulator::tune ( ModulationArgs & params )

overridevirtual

Tune to the specified parameters.

Parameters

[in,out] params Tuning parameters. Updated with missing default values.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ start()

virtual bool ts::TunerEmulator::start ( )

overridevirtual

Start receiving packets.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ stop()

virtual bool ts::TunerEmulator::stop ( bool silent = false )

overridevirtual

Stop receiving packets.

Parameters

[in] silent When true, do not report close errors.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ receive()

virtual size_t ts::TunerEmulator::receive	(	TSPacket *	buffer,
		size_t	max_packets,
		const AbortInterface *	abort = `nullptr`
	)

overridevirtual

Receive packets.

Parameters

[out]	buffer	Address of TS packet receive buffer. Read only complete 188-byte TS packets.
[in]	max_packets	Maximum number of packets to read in buffer.
[in]	abort	If non-zero, invoked when I/O is interrupted (in case of user-interrupt, return, otherwise retry).

Returns: The number of actually received packets (in the range 1 to max_packets). Returning zero means error or end of input.

Reimplemented from ts::TunerBase.

◆ getCurrentTuning()

virtual bool ts::TunerEmulator::getCurrentTuning	(	ModulationArgs &	params,
		bool	reset_unknown
	)

overridevirtual

Get the current tuning parameters.

Parameters

[in,out]	params	Returned tuning parameters. Modify only the properties which can be reported by the tuner.
[in]	reset_unknown	If true, the unknown values (those which are not reported by the tuner) are reset to unknown/zero/auto values. Otherwise, they are left unmodified.

Returns: True on success, false on error.

Reimplemented from ts::TunerBase.

◆ displayStatus()

virtual std::ostream & ts::TunerEmulator::displayStatus	(	std::ostream &	strm,
		const UString &	margin = `UString()`,
		bool	extended = `false`
	)

overridevirtual

Display the characteristics and status of the tuner.

Parameters

[in,out]	strm	Output text stream.
[in]	margin	Left margin to display.
[in]	extended	Display "extended" information. Can be very verbose.

Returns: A reference to strm.

Reimplemented from ts::TunerBase.

◆ GetAllTuners()

static bool ts::TunerBase::GetAllTuners	(	DuckContext &	duck,
		TunerPtrVector &	tuners
	)

staticinherited

Get the list of all existing physical tuners.

Parameters

[in,out]	duck	TSDuck execution context.
[out]	tuners	Returned list of physical tuners on the system.

Returns: True on success, false on error.

◆ abort()

virtual void ts::TunerBase::abort ( bool silent = false )

virtualinherited

Abort any pending or blocked reception.

This unblocks a blocked reader but leaves the tuner in an undefined state. The only safe option after this is a close().

Parameters

[in] silent When true, do not report close errors.

Reimplemented in ts::Tuner, ts::TunerDevice, and ts::TunerDevice.

◆ setSignalTimeout()

virtual void ts::TunerBase::setSignalTimeout ( cn::milliseconds t )

virtualinherited

Set the timeout before getting a signal on start.

If zero, do not wait for signal on start. Must be set before start().

Parameters

[in] t Number of milliseconds to wait after start() before receiving a signal.

Reimplemented in ts::Tuner, ts::TunerDevice, and ts::TunerDevice.

◆ setSignalTimeoutSilent()

virtual void ts::TunerBase::setSignalTimeoutSilent ( bool silent )

virtualinherited

Set if an error should be reported on timeout before getting a signal on start.

Must be set before start().

Parameters

[in] silent If true, no error message will be reported if no signal is received after the timeout on start.

Reimplemented in ts::Tuner, ts::TunerDevice, and ts::TunerDevice.

◆ setReceiveTimeout()

virtual bool ts::TunerBase::setReceiveTimeout ( cn::milliseconds t )

virtualinherited

Set the timeout for receive operations.

Parameters

[in] t Number of milliseconds to wait before receiving packets in a receive() operation. If zero (the default), no timeout is applied.

Returns: True on success, false on error.

Reimplemented in ts::Tuner, ts::TunerDevice, and ts::TunerDevice.

◆ receiveTimeout()

virtual cn::milliseconds ts::TunerBase::receiveTimeout ( ) const

virtualinherited

Get the timeout for receive operation.

Returns: The timeout for receive operation.

See also: setReceiveTimeout()

Reimplemented in ts::Tuner, ts::TunerDevice, and ts::TunerDevice.

◆ setSignalPoll()

virtual void ts::TunerBase::setSignalPoll ( cn::milliseconds t )

virtualinherited

Set the poll interval for signal timeout (Linux-specific).

Must be set before start(). This is a Linux-specific method which does nothing on other systems.

Parameters

[in] t Poll interval in milliseconds.

Reimplemented in ts::Tuner, and ts::TunerDevice.

◆ setDemuxBufferSize()

virtual void ts::TunerBase::setDemuxBufferSize ( size_t s )

virtualinherited

Set the demux buffer size in bytes (Linux-specific).

Must be set before start(). This is a Linux-specific method which does nothing on other systems.

Parameters

[in] s The demux buffer size in bytes.

Reimplemented in ts::Tuner, and ts::TunerDevice.

◆ setSinkQueueSize()

virtual void ts::TunerBase::setSinkQueueSize ( size_t s )

virtualinherited

Set the max number of queued media samples (Windows-specific).

Must be set before start(). This is a Windows-specific method which does nothing on other systems.

Parameters

[in] s Max number of media samples in the queue between the graph thread and the application thread.

Reimplemented in ts::Tuner, and ts::TunerDevice.

◆ setReceiverFilterName()

virtual void ts::TunerBase::setReceiverFilterName ( const UString & name )

virtualinherited

Specify a receiver filter name (Windows-specific).

Must be set before open(). This is a Windows-specific method which does nothing on other systems.

Parameters

[in] name Name of the receiver filter to use. The DirectShow graph will use the specified receiver filter instead of the standard search algorithm.

Reimplemented in ts::Tuner, and ts::TunerDevice.

◆ report()

Report & ts::TunerBase::report ( ) const

inlineinherited

Get a reference to the error report.

Returns: A reference to the error report.

◆ checkTuneParameters()

bool ts::TunerBase::checkTuneParameters ( ModulationArgs & params ) const

protectedinherited

Check the consistency of tune() parameters.

Parameters

[in,out] params Modulation parameters. Updated with default values.

Returns: True on success, false on error.

◆ unimplemented()

bool ts::TunerBase::unimplemented ( ) const

protectedinherited

Helper for unimplemented methods.

Display a standard error message.

Returns: False.

Member Data Documentation

◆ DEFAULT_SINK_QUEUE_SIZE

constexpr size_t ts::TunerBase::DEFAULT_SINK_QUEUE_SIZE = 1000

staticconstexprinherited

Default max number of queued media samples (Windows-specific).

See also: setSinkQueueSize().

The documentation for this class was generated from the following file:

tsTunerEmulator.h

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ TunerEmulator()

Member Function Documentation

◆ open()

◆ close()

◆ isOpen()

◆ infoOnly()

◆ deliverySystems()

◆ deviceName()

◆ deviceInfo()

◆ devicePath()

◆ getSignalState()

◆ tune()

◆ start()

◆ stop()

◆ receive()

◆ getCurrentTuning()

◆ displayStatus()

◆ GetAllTuners()

◆ abort()

◆ setSignalTimeout()

◆ setSignalTimeoutSilent()

◆ setReceiveTimeout()

◆ receiveTimeout()

◆ setSignalPoll()

◆ setDemuxBufferSize()

◆ setSinkQueueSize()

◆ setReceiverFilterName()

◆ report()

◆ checkTuneParameters()

◆ unimplemented()

Member Data Documentation

◆ DEFAULT_SINK_QUEUE_SIZE