The sample rate of an Opus stream's source material.
|handle||The Opus stream handle.
|freq||The sample rate.
Opus streams always have a sample rate of 48000 Hz, and an Opus encoder will resample the source material to that if necessary. This attribute presents the original sample rate, which may be stored in the Opus file header. This attribute is read-only, so cannot be modified via BASS_ChannelSetAttribute.