RecorderBase Class Reference

#include <recorderbase.h>

Inheritance diagram for RecorderBase:

Detailed Description

This is the abstract base class for supporting recorder hardware.

For a digital streams specialization, see the DTVRecorder. For a specialization for MPEG hardware encoded analog streams, see MpegRecorder. For a specialization for software encoding of frame grabber recorders, see NuppelVideoRecorder.

See also:: TVRec

Definition at line 32 of file recorderbase.h.


Public Member Functions
	RecorderBase (TVRec *rec)
virtual	~RecorderBase ()
void	SetFrameRate (double rate)
	Sets the video frame rate.
void	SetRecording (const ProgramInfo *pginfo)
	Changes the Recording from the one set initially with SetOptionsFromProfile().
void	SetRingBuffer (RingBuffer *rbuf)
	Tells recorder to use an externally created ringbuffer.
virtual void	SetOption (const QString &opt, const QString &value)
	Set an specific option.
virtual void	SetOption (const QString &opt, int value)
	Set an specific integer option.
virtual void	SetVideoFilters (QString &filters)=0
	Tells recorder which filters to use.
virtual void	SetOptionsFromProfile (RecordingProfile *profile, const QString &videodev, const QString &audiodev, const QString &vbidev)=0
	Sets basic recorder options.
virtual void	SetNextRecording (const ProgramInfo , RingBuffer )=0
	Sets next recording info, to be applied as soon as practical.
virtual void	Initialize (void)=0
	This is called between SetOptionsFromProfile() and StartRecording() to initialize any devices, etc.
virtual void	StartRecording (void)=0
	StartRecording() starts the recording process, and does not exit until the recording is complete.
virtual void	StopRecording (void)=0
	StopRecording() signals to the StartRecording() function that it should stop recording and exit cleanly.
virtual void	Reset (void)=0
	Reset the recorder to the startup state.
virtual bool	IsRecording (void)=0
	Tells whether the StartRecorder() loop is running.
virtual bool	IsErrored (void)=0
	Tells us whether an unrecoverable error has been encountered.
virtual long long	GetFramesWritten (void)=0
	Returns number of frames written to disk.
virtual bool	Open (void)=0
	Open devices needed by recorder.
virtual int	GetVideoFd (void)=0
	Returns file descriptor of recorder device.
virtual long long	GetKeyframePosition (long long desired)=0
	Returns closest keyframe position before the desired frame.
virtual void	Pause (bool clear=true)
	Pause tells StartRecording() to pause, it should not block.
virtual void	Unpause (void)
	Unpause tells StartRecording() to unpause, it should not block.
virtual bool	IsPaused (void) const
	Returns true iff recorder is paused.
virtual bool	WaitForPause (int timeout=1000)
	WaitForPause blocks until StartRecording() is actually paused, or timeout milliseconds elapse.
double	GetFrameRate (void)
	Returns an approximation of the frame rate.
virtual void	CheckForRingBufferSwitch (void)
	If requested, switch to new RingBuffer/ProgramInfo objects.
void	SavePositionMap (bool force=false)
	Save the seektable to the DB.
Protected Member Functions
void	SetIntOption (RecordingProfile *profile, const QString &name)
	Convenience function used to set integer options from a profile.
void	SetStrOption (RecordingProfile *profile, const QString &name)
	Convenience function used to set QString options from a profile.
virtual bool	PauseAndWait (int timeout=100)
	If request_pause is true Paused and blocks up to timeout milliseconds.
virtual void	ResetForNewFile (void)=0
virtual void	FinishRecording (void)=0
virtual void	StartNewFile (void)
void	SetPositionMapType (int type)
	Set seektable type.
Protected Attributes
TVRec *	tvrec
RingBuffer *	ringBuffer
bool	weMadeBuffer
QString	videocodec
QString	audiodevice
QString	videodevice
QString	vbidevice
int	vbimode
bool	ntsc
bool	ntsc_framerate
double	video_frame_rate
ProgramInfo *	curRecording
bool	request_pause
bool	paused
QWaitCondition	pauseWait
QWaitCondition	unpauseWait
QMutex	nextRingBufferLock
RingBuffer *	nextRingBuffer
ProgramInfo *	nextRecording
int	positionMapType
QMutex	positionMapLock
QMap< long long, long long >	positionMap
QMap< long long, long long >	positionMapDelta
Friends
class	Transcode

Constructor & Destructor Documentation

RecorderBase::RecorderBase ( TVRec * rec )

Definition at line 22 of file recorderbase.cpp.

RecorderBase::~RecorderBase ( void ) [virtual]

Definition at line 34 of file recorderbase.cpp.

Member Function Documentation

void RecorderBase::SetFrameRate ( double rate ) [inline]

Sets the video frame rate.

Definition at line 41 of file recorderbase.h.

Referenced by SetOption(), and Transcode::TranscodeFile().

void RecorderBase::SetRecording ( const ProgramInfo * pginfo )

Changes the Recording from the one set initially with SetOptionsFromProfile().

This method is useful for LiveTV, when we do not want to pause the recorder for a SetOptionsFromProfile() call just because a new program is comming on.

See also:: ChannelNameChanged(const QString&)

Definition at line 61 of file recorderbase.cpp.

Referenced by TVRec::TuningNewRecorder(), and TVRec::TuningRestartRecorder().

void RecorderBase::SetRingBuffer ( RingBuffer * rbuf )

Tells recorder to use an externally created ringbuffer.

If this an external RingBuffer is set, it should be before any Initialize(), Open(), or StartRecorder() calls. Externally created RingBuffers are not deleted in the Recorder's destructor.

Definition at line 48 of file recorderbase.cpp.

Referenced by CheckForRingBufferSwitch(), TVRec::HandleTuning(), TVRec::SetupRecorder(), Transcode::TranscodeFile(), TVRec::TuningFrequency(), and TVRec::TuningRestartRecorder().

void RecorderBase::SetOption	(	const QString &	opt,
		const QString &	value
	)			`[virtual]`

Set an specific option.

Base options include: codec, audiodevice, videodevice, vbidevice, tvformat (ntsc,ntsc-jp,pal-m), vbiformat ("none","pal teletext","ntsc").

Reimplemented in DBox2Recorder, DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Definition at line 79 of file recorderbase.cpp.

Referenced by SetIntOption(), NuppelVideoRecorder::SetOption(), MpegRecorder::SetOption(), DTVRecorder::SetOption(), SetStrOption(), and TVRec::SetupRecorder().

void RecorderBase::SetOption	(	const QString &	opt,
		int	value
	)			`[virtual]`

Set an specific integer option.

There are no integer options in RecorderBase.

Reimplemented in DBox2Recorder, DTVRecorder, DVBRecorder, MpegRecorder, and NuppelVideoRecorder.

Definition at line 125 of file recorderbase.cpp.

virtual void RecorderBase::SetVideoFilters ( QString & filters ) [pure virtual]

Tells recorder which filters to use.

These filters are used by frame grabber encoders to lower the bitrate while keeping quality good. They must execute quickly so that frames are not lost by the recorder.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::SetVideoFiltersForChannel().

virtual void RecorderBase::SetOptionsFromProfile	(	RecordingProfile *	profile,
		const QString &	videodev,
		const QString &	audiodev,
		const QString &	vbidev
	)			`[pure virtual]`

Sets basic recorder options.

SetOptionsFromProfile is used to tell the recorder about the recording profile as well as the devices to use.

Implemented in DBox2Recorder, DVBRecorder, FirewireRecorder, HDHRRecorder, IPTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::SetupRecorder().

virtual void RecorderBase::SetNextRecording	(	const ProgramInfo *	,
		RingBuffer *
	)			`[pure virtual]`

Sets next recording info, to be applied as soon as practical.

This should not lose any frames on the switchover, and should initialize the RingBuffer stream with headers as appropriate.

The switch does not have to happen immediately, but should happen soon. (i.e. it can wait for a key frame..)

This calls TVRec::RingBufferChanged() when the switch happens.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::SwitchLiveTVRingBuffer().

virtual void RecorderBase::Initialize ( void ) [pure virtual]

This is called between SetOptionsFromProfile() and StartRecording() to initialize any devices, etc.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::SetupRecorder().

virtual void RecorderBase::StartRecording ( void ) [pure virtual]

StartRecording() starts the recording process, and does not exit until the recording is complete.

See also:: StopRecording()

Implemented in DBox2Recorder, DVBRecorder, FirewireRecorder, HDHRRecorder, IPTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::RecorderThread().

virtual void RecorderBase::StopRecording ( void ) [pure virtual]

StopRecording() signals to the StartRecording() function that it should stop recording and exit cleanly.

This function should block until StartRecording() has finished up.

Implemented in DTVRecorder, DVBRecorder, IPTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::TeardownRecorder().

virtual void RecorderBase::Reset ( void ) [pure virtual]

Reset the recorder to the startup state.

This is used after Pause(bool), WaitForPause() and after the RingBuffer's StopReads() method has been called.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::TuningRestartRecorder().

virtual bool RecorderBase::IsRecording ( void ) [pure virtual]

Tells whether the StartRecorder() loop is running.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::IsReallyRecording(), and TVRec::TuningNewRecorder().

virtual bool RecorderBase::IsErrored ( void ) [pure virtual]

Tells us whether an unrecoverable error has been encountered.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::SetupRecorder(), and TVRec::TuningNewRecorder().

virtual long long RecorderBase::GetFramesWritten ( void ) [pure virtual]

Returns number of frames written to disk.

It is not always safe to seek up to this frame in a player because frames may not be written in display order.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::GetFramesWritten().

virtual bool RecorderBase::Open ( void ) [pure virtual]

Open devices needed by recorder.

This is usually called by StartRecording().

Returns:: true if device was successfully opened.

Implemented in DBox2Recorder, DVBRecorder, FirewireRecorder, HDHRRecorder, IPTVRecorder, MpegRecorder, and NuppelVideoRecorder.

virtual int RecorderBase::GetVideoFd ( void ) [pure virtual]

Returns file descriptor of recorder device.

This is used by channel when only one open file descriptor is allowed on a device node. This is the case with video4linux devices and similar devices in BSD. It is not needed by newer drivers, such as those used for DVB.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::TuningNewRecorder(), and TVRec::TuningRestartRecorder().

virtual long long RecorderBase::GetKeyframePosition ( long long desired ) [pure virtual]

Returns closest keyframe position before the desired frame.

This returns -1 if a keyframe position can not be found for a frame. This could be true if the keyframe has not yet been seen by the recorder(unlikely), or if a keyframe map does not exist or is not up to date. The latter can happen because the video is an external video, because the database is corrupted, or because this is a live recording and it is being read by a remote frontend faster than the keyframes can be saved to the database.

Returns:: Closest prior keyframe, or -1 if there is no prior known keyframe.

Implemented in DTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Referenced by TVRec::GetKeyframePosition().

virtual void RecorderBase::Pause ( bool clear = true ) [inline, virtual]

Pause tells StartRecording() to pause, it should not block.

Once paused the recorder calls tvrec->RecorderPaused().

Parameters:

clear

if true any generated timecodes should be reset.

See also:: Unpause(), WaitForPause()

Reimplemented in IPTVRecorder, MpegRecorder, and NuppelVideoRecorder.

Definition at line 189 of file recorderbase.h.

Referenced by IPTVRecorder::Pause(), and TVRec::PauseRecorder().

virtual void RecorderBase::Unpause ( void ) [inline, virtual]

Unpause tells StartRecording() to unpause, it should not block.

Reimplemented in IPTVRecorder, and NuppelVideoRecorder.

Definition at line 193 of file recorderbase.h.

Referenced by TVRec::TuningRestartRecorder(), and IPTVRecorder::Unpause().

virtual bool RecorderBase::IsPaused ( void ) const [inline, virtual]

Returns true iff recorder is paused.

Reimplemented in NuppelVideoRecorder.

Definition at line 196 of file recorderbase.h.

Referenced by IPTVRecorder::AddData(), TVRec::HandleTuning(), and WaitForPause().

bool RecorderBase::WaitForPause ( int timeout = 1000 ) [virtual]

WaitForPause blocks until StartRecording() is actually paused, or timeout milliseconds elapse.

Parameters:

timeout

number of milliseconds to wait defaults to 1000.

Returns:: true iff pause happened within timeout period.

Definition at line 158 of file recorderbase.cpp.

double RecorderBase::GetFrameRate ( void ) [inline]

Returns an approximation of the frame rate.

Bug:: This can be off by at least half, our non-frame grabber based recorders do not not try to approximate the frame rate. So a 720p recording at 60fps will report a frame-rate of 25fps.

Definition at line 205 of file recorderbase.h.

Referenced by TVRec::GetFramerate().

void RecorderBase::CheckForRingBufferSwitch ( void ) [virtual]

If requested, switch to new RingBuffer/ProgramInfo objects.

Definition at line 200 of file recorderbase.cpp.

Referenced by NuppelVideoRecorder::doWriteThread(), DTVRecorder::HandleH264Keyframe(), MpegRecorder::HandleKeyframe(), DTVRecorder::HandleKeyframe(), and TVRec::SwitchLiveTVRingBuffer().

void RecorderBase::SavePositionMap ( bool force = false )

Save the seektable to the DB.

This saves the postition map delta to the database if force is true or there are 30 frames in the map or there are five frames in the map with less than 30 frames in the non-delta position map.

Parameters:

force

If true this forces a DB sync.

Definition at line 238 of file recorderbase.cpp.

Referenced by NuppelVideoRecorder::FinishRecording(), MpegRecorder::FinishRecording(), DTVRecorder::FinishRecording(), TVRec::RunTV(), NuppelVideoRecorder::SetNextRecording(), MpegRecorder::SetNextRecording(), and DTVRecorder::SetNextRecording().