According to documentation, response from PrefetchSampleRange may be:
ACF_OK => Means sample range prefetched
AMA_S_ALREADY_PREFETCHED => Means sample range yet prefetched
What about if plugin is busy ?
There is a way to tell MC to request newsly the prefetch later for the same start sample ? I made an attempt responding AMA_S_RESOURCE_LOCKED but no more prefetch request are generated.
Regards
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