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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:
|
| Output Pin Interfaces | IMediaPosition, IMediaSeeking, IPin, IQualityControl |
| Filter CLSID | CLSID_ACMWrapper |
| Executable | Quartz.dll |
| Merit | MERIT_NORMAL |
| Filter Category | CLSID_AudioCompressorCategory |
See Also
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