The LEAD AMR Encoder is a DirectShow filter for compressing audio data using the AMR speech compression. The AMR speech coder consists of the multi-rate speech coder, a source controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets.
The multi-rate speech coder is a single integrated speech codec with eight source rates from 4.75 kbps to 12.2 kbps, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command.
Technical details for the filter are provided in the following table:
|Filter Interfaces||ILMAMREncoder, ILMMCommon|
|Input Media Types||Type:|
|Output Media Types||Type:|
|MEDIASUBTYPE_LAVIAMR (LEAD proprietary)|
|Property Page CLSID||CLSID_LMAMREncoderPropertyPage|
NOTE: Media types are defined in the LGuids.h header file.
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