Load (opus/opus.go)

Opus codec backend that encodes and decodes audio streams, caching decoders per session for efficient reuse.

// Source: https://github.com/mudler/LocalAI | License: MIT | Copyright 2023-2025 Ettore Di Giacinto (mudler@localai.io)
// Provided via justclaw.it.com; keep this notice with the code.
package main

import (
	"fmt"
	"sync"
	"time"

	"github.com/mudler/LocalAI/pkg/grpc/base"
	pb "github.com/mudler/LocalAI/pkg/grpc/proto"
	"github.com/mudler/LocalAI/pkg/sound"
)

const (
	opusSampleRate    = 48000
	opusChannels      = 1
	opusFrameSize     = 960 // 20ms at 48kHz
	opusMaxPacketSize = 4000
	opusMaxFrameSize  = 5760 // 120ms at 48kHz

	decoderIdleTTL   = 60 * time.Second
	decoderEvictTick = 30 * time.Second
)

type cachedDecoder struct {
	mu       sync.Mutex
	dec      *Decoder
	lastUsed time.Time
}

type Opus struct {
	base.Base

	decodersMu sync.Mutex
	decoders   map[string]*cachedDecoder
}

/

... (truncated -- full source via MCP)