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2.2.2.3 Quality Mode PDU

The Quality Mode PDU is a PDU used by the client to select one of three quality modes. If both the client and server are at least version 6, the client MUST send a Quality Mode PDU immediately after sending the audio formats. This packet is only used when the client and server versions are both at least 6.<7> This PDU MUST be sent using virtual channels.


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Header

wQualityMode

Reserved

Header (4 bytes): An RDPSND PDU Header (section 2.2.1). The msgType field of the RDPSND PDU Header MUST be set to SNDC_QUALITYMODE (0x0C).

wQualityMode (2 bytes): A 16-bit unsigned integer. This field specifies the quality setting the client has requested. The definition of these three modes is implementation-dependent, but SHOULD use the following guidelines.

Value

Meaning

DYNAMIC_QUALITY

0x0000

The server dynamically adjusts the audio format to best match the bandwidth and latency characteristics of the network.

MEDIUM_QUALITY

0x0001

The server chooses an audio format from the list of formats the client supports that gives moderate audio quality and requires a moderate amount of bandwidth.

HIGH_QUALITY

0x0002

The server chooses the audio format that provides the best quality audio without regard to the bandwidth requirements for that format.

Reserved (2 bytes): A 16-bit unsigned integer. This field is unused. The value is arbitrary and MUST be ignored on receipt.