Pro-Codec User Manual

9.3 Codec Specifications 9 SPECIFICATIONS
9.3.2 Codec and Session Sample Rate
The Plug-In and many of the codecs are sensitive to the session sample rate and channel
configuration.
The Plug-In supports a wide variety of host DAW applications, and understandably many
of these applications provide differing amounts of session configuration settings to a
plug-in. Some applications only present session configuration information to a plug-in
when there is an active audio data stream (i.e. the transport is set to play).
As a result of this, care must be taken when:
• selecting codec settings after switching a session sample rate or channel
configuration
• when loading a Preset that was saved from a session that used a different
configuration
Session loads/restores in Pro Tools, Logic, Cubase and Nuendo are immune from this
problem.
It is possible in some applications that a newly instantiated Pro-Codec has not been
provided with current session data. If this is the case, when a codec configuration is
selected (manually or via a preset load) that is incompatible with the real session
configuration, then the Plug-In could receive incompatible data when playback starts. In
all cases, the Plug-In will endeavour to match the requested codec settings, and where
possible will select the closest compatible settings. By preference, the substitute codec
will be of the same type, but using the closest compatible bit rate. Where the codec
doesn’t support the sample rate at any bit rate, the codec will default to AAC-LC at the
closest bit rate.
To illustrate this behaviour, consider a stereo session at 48 kHz with two codecs selected.
If the session configuration is changed to mono at 32 kHz, the plug-in will make the
following codec selections:
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