Audio Capture

An application can use Microsoft� DirectShow� to capture audio data from microphones, tape players, and other devices, through the inputs on the sound card. Typical scenarios include:

• Recording a voiceover narration for later dubbing over a video stream.
• Converting legacy analog audio content to digital format.
• Capturing voice or music for transmission over a network.

End users have several options for capturing audio from the sound card to the hard disk. Most cards provide applications for mixing and recording from their audio inputs. The Microsoft� Windows� operating system provides Sound Recorder, a simple utility application for recording from a microphone. Microsoft� Windows Media� Tools includes the Windows Media Encoder stand-alone application. The Windows Media Encoder can also be incorporated into a DirectShow application as a Microsoft� DirectX� Media Object (DMO). This section describes how to integrate audio capture functionality within your own application using DirectShow.

This section contains the following topics:

• About the Audio Capture Filter
• Creating an Audio Capture Graph
• Creating an Audio Capture Graph with Preview
• Setting Audio Capture Properties