Function JxlDecoderGetExtraChannelName 

pub unsafe extern "C-unwind" fn JxlDecoderGetExtraChannelName(
    dec: *const JxlDecoder,
    index: usize,
    name: *mut c_char,
    size: usize,
) -> JxlDecoderStatus

Outputs name for extra channel at the given index in UTF-8. The index must be smaller than num_extra_channels in the associated JxlBasicInfo. The buffer for name must have at least name_length + 1 bytes allocated, gotten from the associated JxlExtraChannelInfo.

Parameters

• dec: decoder object
• index: index of the extra channel to query.
• name: buffer to copy the name into
• size: size of the name buffer in bytes

Returns

• JxlDecoderStatus::Success if the value is available
• JxlDecoderStatus::NeedMoreInput if not yet available
• JxlDecoderStatus::Error in case of other error conditions.