Vorbis - Mar 2014 - Vorbis encoder - How many PCM samples in one packet?

Hi, Does anyone know what is the exact number of the raw PCM samples that it
might be entered in every one Vourbis encoded packet?  For example in mp2 - 1152
samples per frames, in mp3 - 1152 samples per frame, in AAC - 1536 etc.
  
  Thanks!  Cwetan 
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