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Fit the TOC byte inside the bitrate budget #199

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Merged
thomas-vilte merged 1 commit into from
Aug 12, 2026
Merged

Fit the TOC byte inside the bitrate budget #199

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9 changes: 8 additions & 1 deletion encoder.go
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Original file line number Diff line number Diff line change
Expand Up @@ -557,8 +557,15 @@ func splitChannels(in []float32, numChannels, frameSamples int) [][]float32 {
return ch
}

// tocHeaderBytes is the single table-of-contents byte every packet starts with.
const tocHeaderBytes = 1

// frameBytes returns the CELT payload budget. The packet carries a TOC byte in
// front of it, so the payload gets one byte less than the frame's share of the
// bitrate — otherwise every packet overshoots the target by a byte, which is
// 400 bps at 20 ms.
func (e *Encoder) frameBytes() int {
return int(int64(e.bitrate) * frame20msNS / 1000000000 / 8)
return int(int64(e.bitrate)*frame20msNS/1000000000/8) - tocHeaderBytes
}

func (e *Encoder) frameSampleCount() int {
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