// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package sfu

import (
	"sync"

	"github.com/pion/rtp"
)

var (
	PacketFactory = &sync.Pool{
		New: func() any {
			b := make([]byte, 1460)
			return &b
		},
	}

	RTPHeaderFactory = &sync.Pool{
		New: func() any {
			return &rtp.Header{}
		},
	}
)

// initPooledRTPHeader sets hdr to h while keeping the pooled header's
// Extensions capacity, so SetExtension does not allocate per packet.
func initPooledRTPHeader(hdr *rtp.Header, h rtp.Header) {
	h.Extensions = hdr.Extensions[:0]
	*hdr = h
}