ACT
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- Samples: http://samples.mplayerhq.hu/A-codecs/act/
- Working decoder: http://www.netac.com/Download/C635/C635%20Driver&Tools.zip
ACT is a low complexity speech compression codec.It might be the G729 speech code. There seems to be 3 versions of the format.
ACT File Format
The first 512 bytes seem to be a regular RIFF header. The function at 0x00401000 is in the call tree when converting act files.