LEAD AMR Encoder

The LEAD AMR Encoder Also known as compressor, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder. is a DirectShow Ò 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 A COmpressor combined with a DECompressor, or encoder and a decoder, which allows you to both compress and decompress that same data. 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

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.

LEAD AMR Encoder User Interface