const EnvelopeSample sub_sample = {
*min_element(src_ptr, src_ptr + EnvelopeScaleFactor),
*max_element(src_ptr, src_ptr + EnvelopeScaleFactor),
const EnvelopeSample sub_sample = {
*min_element(src_ptr, src_ptr + EnvelopeScaleFactor),
*max_element(src_ptr, src_ptr + EnvelopeScaleFactor),