ACM Wrapper Filter (Windows CE 5.0)

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The ACM Wrapper filter enables codecs that use the Audio Compression Manager (ACM) to join a DirectShow filter graph.

Decompression is only to PCM audio.

When wrapping a compressor, this filter appears in the audio compressor category and can support additional interfaces.

There should never be any need to add it manually to a graph; it is pulled in automatically by the Filter Graph Manager. It is used only for playback or sample rate conversion.

The ACM Wrapper filter supports the following ACM stream drivers and codecs:

  • WMA
  • GSM 6.10
  • G.711
  • MP3
  • MS ADPCM
  • IMA ADPCM

The following table shows the filter properties.

Filter property Description
Filter Interfaces IBaseFilter
Input Pin Media Types MEDIATYPE_Audio, MEDIASUBTYPE_NULL
Input Pin Interfaces IMemInputPin, IPin, IQualityControl
Output Pin Media Types MEDIATYPE_Audio, MEDIASUBTYPE_PCM. Any combination of the following is possible:
  • Samples per second (kHz): 44.1, 22.05, 11.025, or 8.0.
  • Channels: stereo or mono.
  • Bits per sample: 8 or 16.
Output Pin Interfaces IMediaPosition, IMediaSeeking, IPin, IQualityControl
Filter CLSID CLSID_ACMWrapper
Executable Quartz.dll
Merit MERIT_NORMAL
Filter Category CLSID_AudioCompressorCategory

See Also

Supported DirectShow Filters

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