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 |
|
Interface ID |
IID_ILMAMREncoder |
Input Media Types |
Type: |
Output Media Types |
Type: |
Filter CLSID |
CLSID_LMAMREncoder |
Property Page CLSID |
CLSID_LMAMREncoderPropertyPage |
Executable |
LEncAMR.dll, DSKernel2.dll |
Filter category |
CLSID_AudioCompressorCategory |
Header |
ILEncAMR.h |
Note: Media types are defined in the LGUIDs.h header file.
Win32, x64
LEAD AMR Encoder User Interface
Raster .NET | C API | C++ Class Library | JavaScript HTML5
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