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https://github.com/vsariola/sointu.git
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38e9007bf8
Throughout sointu, we assume stereo audiobuffers, but were passing around []float32. This had several issues, including len(buf)/2 and numSamples*2 type of length conversion in many places. Also, it caused one bug in a test case, causing it to succeed when it should have not (the test had +-1 when it should have had +-2). This refactoring makes it impossible to have odd length buffer issues.
33 lines
771 B
Go
33 lines
771 B
Go
package oto
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import (
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"math"
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"github.com/vsariola/sointu"
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)
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// FloatBufferTo16BitLE is a naive helper method to convert []float32 buffers to
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// 16-bit little-endian, but encoded in byte buffer
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//
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// Appends the encoded bytes into "to" slice, allowing you to preallocate the
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// capacity or just use nil
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func FloatBufferTo16BitLE(from sointu.AudioBuffer, to []byte) []byte {
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for _, v := range from {
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left := to16BitSample(v[0])
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right := to16BitSample(v[1])
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to = append(to, byte(left&255), byte(left>>8), byte(right&255), byte(right>>8))
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}
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return to
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}
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// convert float32 to int16, clamping to min and max
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func to16BitSample(v float32) int16 {
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if v < -1.0 {
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return -math.MaxInt16
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}
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if v > 1.0 {
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return math.MaxInt16
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}
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return int16(v * math.MaxInt16)
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}
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