IAsyncReader2 Interface (Compact 2013)

3/26/2014

This interface extends IAsyncReader Interface to sequentially retrieve media samples from the stream.

Methods

• IAsyncReader2::SetCurrentPosition
  Sets the position of the first requested sample in the media stream

• IAsyncReader2::SetCurrentTime
  Sets the file position, in time, of the first requested sample in the media stream

• IAsyncReader2::GetCurrentPosition
  Retrieves the position of the current sample in the media stream

• IAsyncReader2::GetNext
  Asynchronously returns the next media sample

• IAsyncReader2::GetCapabilities
  Returns the capabilities of the media stream

• IAsyncReader2::IsEndOfStream
  Determines whether a file pointer is at the end of the media stream for this connection

• IAsyncReader2::GetEventHandle
  Returns a handle to the event that is signaled when new media samples are available

Remarks

This interface offers better performance than the IAsyncReader Interface because it reduces the number of memory operations that are required to retrieve media samples.

A pull filter that connects to a buffering filter or a source filter can use this interface. The upstream filter can be the Buffering Stream Filter or any filter that receives data from a source filter.

When to Implement

Implement this interface on a pin if your filter is a source filter or a buffering filter.

Requirements

See Also

Reference

DirectShow Interfaces