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.

LEAD AMR Encoder

Comments

Platforms

See Also