LEAD AAC Encoder

The LEAD AAC 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® filter for compressing audio data using the AAC compression standard (ISO/IEC 13818-7). The AAC standard delivers high quality audio at lower bitrate compared to other audio encoding standards like ISO/MPEG Audio Layer-3; MP3.

This encoder offers both variable bitrate and constant bitrate. However, due to a limitation in the AVI multiplexer A module that combines audio and video into one file., the encoder offers constant bit rate only if it is connected to the AVI multiplexer.

Technical details for the filter are provided in the following table:

Filter Interfaces	ILMAACEncoder, ILMMCommon
Interface ID	IID_ILMAACEncoder
Input Media Types	Type: MEDIATYPE_Audio Subtypes: MEDIASUBTYPE_PCM
Output Media Types	Type: MEDIATYPE_Audio Subtype: MEDIASUBTYPE_LAAC (LEAD proprietary). MEDIASUBTYPE_mp4a MEDIASUBTYPE_AAC (format tag = 0xFF)
Filter CLSID	CLSID_LMAACEncoder
Property Page CLSID	CLSID_LMAACEncoderPropertyPage
Executable	LEncAAC.dll, DSKernel2.dll
Filter category	CLSID_AudioCompressorCategory
Header	ILEncAAC.h

Note: Media types are defined in the LGUIDs.h header file.

Platforms

Win32, x64