[non-BE] Fix clicks in stereo switching

vaclavrequested to merge
float-1563-clicks-in-stereo-switching into main

Reason why this change is needed

  • Serious artifacts are observed in the bitrate switching which involves switching of different CPE modes.

Description of the change

  • Set TD stereo secondary channel core to ACELP to avoid the core switching in this channel which causes serious artifacts.

Affected operating points

  • Non-BE for stereo switching cases in the sequence MDCT stereo -> DFT stereo -> TD stereo.

Related to #1563 (closed)

Edited by vaclav

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