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:
Component | Description |
---|---|
Filter Interfaces | ILMAMREncoder, ILMMCommon |
Interface ID | IID_ILMAMREncoder |
Input Media Types | Type: |
MEDIATYPE_Audio | |
Subtypes: | |
MEDIASUBTYPE_PCM | |
Output Media Types | Type: |
MEDIATYPE_Audio | |
Subtype: | |
MEDIASUBTYPE_LAVIAMR (LEAD proprietary) | |
MEDIASUBTYPE_SAMR | |
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
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