CSourcePosition Class (Compact 2013)

Artigo
01/31/2017

3/26/2014

CMediaPosition Class

CSourcePosition

This is an abstract class that assists source filters with the implementation of IMediaPosition methods.

Derive from this class and set the duration and default stop positions.

This class supports IMediaPosition, and calls the pure virtual member functions CSourcePosition::ChangeStart, CSourcePosition::ChangeStop, and CSourcePosition::ChangeRate when CSourcePosition::put_CurrentPosition, CSourcePosition::put_StopTime, or CSourcePosition::put_Rate is called, to allow a source filter to handle these commands and start sending new data.

Override the CSourcePosition::ChangeStart, CSourcePosition::ChangeStop, and CSourcePosition::ChangeRate member functions to do something when the properties change.

Protected Data Members

Member	Description
m_Duration	Duration of the stream.
m_pLock	Pointer to a CCritSec object for locking.
m_Rate	Sample rate.
m_Start	Start time.
m_Stop	Stop time.

Member Functions

Member function	Description
CSourcePosition	Constructs a CSourcePosition object.

Overrideable Member Functions

Member function	Description
ChangeRate	Override this pure virtual to handle notification that the rate property has changed.
ChangeStart	Override this pure virtual to handle notification that the start position property has changed.
ChangeStop	Override this pure virtual to handle notification that the stop position property has changed.

Implemented IMediaPosition Methods

Method	Description
get_CurrentPosition	Not currently implemented.
get_Duration	Retrieves the total duration of the media.
get_PrerollTime	Not currently implemented.
get_Rate	Retrieves the playback rate, relative to normal playback of the media.
get_StopTime	Retrieves the position within the media at which playback should stop.
put_CurrentPosition	Sets the position within the media at which playback should start.
put_PrerollTime	Not currently implemented.
put_Rate	Sets the playback rate, relative to normal playback of the media.
put_StopTime	Sets the position within the media at which playback should stop.

Requirements

Header	dshow.h, Streams.h
Library	ole32.lib, Ole32auth.lib, Strmbase.lib, Strmiids.lib, uuid.lib

See Also

Reference

DirectShow Classes