upsample by 2x, optionally using interpolation count: how many samples to upsample. will become count*2 samples in buffer, in place. pbuffer: buffer to upsample into (in place) pfiltermem: filter memory. NOTE: this must match the filtertype ie: filterlinear[] for FILTERTYPE_LINEAR if NULL then perform no filtering. cfltmem: max number of sample pairs filter can use filtertype: FILTERTYPE_NONE, _L
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