Function addSample

storage/buffer.go:581–617

addSample adds a sample to a buffer of chunks.Sample, i.e. the general case using an interface as the type.

(s chunks.Sample, buf []chunks.Sample, r *sampleRing)

// addSample adds a sample to a buffer of chunks.Sample, i.e. the general case
// using an interface as the type.
func addSample(s chunks.Sample, buf []chunks.Sample, r *sampleRing) []chunks.Sample {
	l := len(buf)
	// Grow the ring buffer if it fits no more elements.
	if l == 0 {
		buf = make([]chunks.Sample, 16)
		l = 16
	}
	if l == r.l {
		newBuf := make([]chunks.Sample, 2*l)
		copy(newBuf[l+r.f:], buf[r.f:])
		copy(newBuf, buf[:r.f])

		buf = newBuf
		r.i = r.f
		r.f += l
		l = 2 * l
	} else {
		r.i++
		if r.i >= l {
			r.i -= l
		}
	}

	buf[r.i] = s.Copy()
	r.l++

	// Free head of the buffer of samples that just fell out of the range.
	tmin := s.T() - r.delta
	for buf[r.f].T() < tmin {
		r.f++
		if r.f >= l {
			r.f -= l
		}
		r.l--
	}
	return buf
}

// addF adds an fSample to a (specialized) fSample buffer.
func addF(s fSample, buf []fSample, r *sampleRing) []fSample {