The top-level message sent by the client for the ListVoices
method.
Attribute
Name
Description
language_code
str
Optional. Recommended.
BCP-47 __
language tag. If not specified, the API will return all
supported voices. If specified, the ListVoices call will
only return voices that can be used to synthesize this
language_code. E.g. when specifying "en-NZ", you will
get supported "en-NZ" voices; when specifying "no",
you will get supported "no-\*" (Norwegian) and
"nb-\*" (Norwegian Bokmal) voices; specifying "zh"
will also get supported "cmn-\*" voices; specifying
"zh-hk" will also get supported "yue-hk" voices.