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LEAD AMR Encoder

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

Comments

NOTE: Media types are defined in the LGuids.h header file.

Platforms

Win32, x64.

See Also

LEAD AMR Encoder User Interface

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© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.