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CSourcePositionis an abstract class that assists source filters with the implementation of IMediaPositionmethods.
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::ChangeRatewhen CSourcePosition::put_CurrentPosition, CSourcePosition::put_StopTime, or CSourcePosition::put_Rateis called, to allow a source filter to handle these commands and start sending new data.
Override the CSourcePosition::ChangeStart, CSourcePosition::ChangeStop, and CSourcePosition::ChangeRatemember functions to do something when the properties change.
Protected Data Members
| m_Duration | Duration of the stream. |
| m_pLock | Pointer to a CCritSecobject for locking. |
| m_Rate | Sample rate. |
| m_Start | Start time. |
| m_Stop | Stop time. |
Member Functions
| CSourcePosition | Constructs a CSourcePositionobject. |
Overridable Member Functions
| 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
| 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. |