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34 lines
573 B
Go
34 lines
573 B
Go
package decode
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import (
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"io"
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)
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// TODO: move?
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// TODO: make generic replace reader? share with id3v2 unsync?
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type NALUnescapeReader struct {
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io.Reader
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lastTwoZeros [2]bool
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}
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func (r NALUnescapeReader) Read(p []byte) (n int, err error) {
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n, err = r.Reader.Read(p)
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ni := 0
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for i, b := range p[0:n] {
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if r.lastTwoZeros[0] && r.lastTwoZeros[1] && b == 0x03 {
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n--
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r.lastTwoZeros[0] = false
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r.lastTwoZeros[1] = false
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continue
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} else {
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r.lastTwoZeros[1] = r.lastTwoZeros[0]
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r.lastTwoZeros[0] = b == 0
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}
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p[ni] = p[i]
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ni++
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}
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return n, err
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}
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