Audio Device Conformance Templates

The following table lists the device conformance templates and associated parameters for the Windows Media Audio 9 codec, or later.

Template string Bit rate range Notes
"L1" 64 Kbps 160 Kbps This template is intended for constrained audio-only devices.
"L2" <= 160 Kbps This template corresponds to Class 4 in the Windows Media Audio porting kit, which supports the entire Windows Media Audio decoder implementation.
"L3" <= 384 Kbps This template corresponds to Class 4 in the Windows Media Audio porting kit, which supports the entire Windows Media Audio decoder implementation.The bit rate range is the only difference between this template and L2.
"L" All bit rates This template is for use with personal computers only, and is usually used to showcase the full capabilities of the codec.

The following table lists the device conformance templates and associated parameters for the Windows Media Audio 9 Voice codec.

Template string Bit rate range Notes
"S1" <= 20 Kbps This template is intended for very low-complexity devices only.This template is speech only.
"S2" <= 20 Kbps This is the recommended template for most applications.This template supports combinations of speech and music.

The following table lists the device conformance templates and associated parameters for the Windows Media Audio 9 Professional codec, or later.

Template string Properties Notes
"M1" Bit rate <= 384 KbpsSampling rate <= 48 kHz
Channels <= 5.1
This template is recommended for standard movies with surround sound.
"M2" Bit rate <= 768 KbpsSampling rate <= 96 kHz
Channels <= 5.1
This template is recommended for high-definition movies with surround sound.
"M3" Bit rate <= 1,500 KbpsSampling rate <= 96 kHz
Channels <= 7.1
This template is recommended for high-definition movies with 8-channel surround sound, such as content encoded for presentation in theaters.
"M" All bit ratesAll sampling rates
All channels
This template is for use with personal computers only, and is usually used to showcase the full capabilities of the codec.This is also the template designation for all audio encoded with the Windows Media Audio 9 Lossless codec.

Device Conformance Template Parameters

Recommended Device Conformance Template Combinations

Video Device Conformance Templates