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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 KbpsThis template is intended for constrained audio-only devices.
"L2"<= 160 KbpsThis template corresponds to Class 4 in the Windows Media Audio porting kit, which supports the entire Windows Media Audio decoder implementation.
"L3"<= 384 KbpsThis 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 ratesThis 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 KbpsThis template is intended for very low-complexity devices only.

This template is speech only.

"S2"<= 20 KbpsThis 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 Kbps

Sampling rate <= 48 kHz

Channels <= 5.1

This template is recommended for standard movies with surround sound.
"M2"Bit rate <= 768 Kbps

Sampling rate <= 96 kHz

Channels <= 5.1

This template is recommended for high-definition movies with surround sound.
"M3"Bit rate <= 1,500 Kbps

Sampling 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 rates

All 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.

 

Related topics

Device Conformance Template Parameters
Recommended Device Conformance Template Combinations
Video Device Conformance Templates

 

 

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