Decoder Settings for Windows Media Center Edition
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Windows XP Media Center Edition 2005 and later uses the ICodecAPI interface to configure the audio decoder filter for television and DVD playback. The following properties are supported.
| Property GUID | Description |
|---|---|
| CODECAPI_AUDIO_OUTPUT_FORMAT | Configures the audio output format. See Remarks. |
Remarks
The value of the CODECAPI_AUDIO_OUTPUT_FORMAT property is a string representation of a GUID, stored as a BSTR value. The following GUIDs are defined.
| GUID | Description |
|---|---|
| CODECAPI_AUDIO_OUTPUT_FORMAT_PCM_STEREO_MATRIXENCODED | The software audio filter should perform software decoding and output a stereo audio stream, with the multichannel audio matrix encoded to the two channels. |
| CODECAPI_AUDIO_OUTPUT_FORMAT_PCM_STEREO | The software audio filter should perform software decoding and output a stereo audio stream. |
| CODECAPI_AUDIO_OUTPUT_FORMAT_SPDIF_PCM | The software audio filter should perform software audio decoding, even though the physical output from the PC may be a digital interface, such as S/PDIF. |
| CODECAPI_AUDIO_OUTPUT_FORMAT_SPDIF_BITSTREAM | The software audio filter should not perform software audio decoding, but should pass the raw digital audio bitstream for external processing by a device connected with a digital audio link, such as S/PDIF. |
| CODECAPI_AUDIO_OUTPUT_FORMAT_PCM_HEADPHONES | The software audio filter should perform software audio decoding and should apply proprietary processing to optimize for headphones. Support for this setting is optional. |
Note
The ICodecAPI interface stores codec properties as key/value pairs, where the key is a GUID and the value is a VARIANT type.
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