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Simplifies calculations very slightly.

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This commit is contained in:
Thomas Harte 2020-07-17 23:18:08 -04:00
parent f6b7467d75
commit 8dcb48254a
1 changed files with 4 additions and 4 deletions
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8
Storage/Disk/Track/PCMSegment.cpp
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@ -132,11 +132,11 @@ float PCMSegmentEventSource::seek_to(float time_from_start) {
// adjust for time to get to bit zero and determine number of bits in;
// bit_pointer_ always records _the next bit_ that might trigger an event,
// so should be one beyond the one reached by a seek.
const float relative_time = time_from_start + half_bit_length; // the period [0, 0.5) should map to window 0; [0.5, 1.5) should map to window 1; etc.
bit_pointer_ = 1 + size_t(relative_time / bit_length);
const float relative_time = time_from_start + half_bit_length; // the period [0, 0.5) should map to window 0, ending with bit 0; [0.5, 1.5) should map to window 1; etc.
bit_pointer_ = size_t(relative_time / bit_length);
// map up to the correct amount of time
return half_bit_length + segment_->length_of_a_bit.get<float>() * float(bit_pointer_ - 1);
// Map up to the correct amount of time; this should be the start of the window that ends upon the bit at bit_pointer_.
return bit_length * float(bit_pointer_) - half_bit_length;
}
const PCMSegment &PCMSegmentEventSource::segment() const {