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// Copyright 2021, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package rtprtcp
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import "github.com/q191201771/naza/pkg/nazalog"
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type RtpPackerPayloadAac struct {
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}
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func NewRtpPackerPayloadAac() *RtpPackerPayloadAac {
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return &RtpPackerPayloadAac{}
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}
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func (r *RtpPackerPayloadAac) Pack(in []byte, maxSize int) (out [][]byte) {
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if in == nil || maxSize <= 0 {
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return
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}
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// TODO(chef): 目前只支持一帧打成一个rtp包，不支持多帧打成一个rtp包，也不支持一帧跨越两个rtp包
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// 协议方面可以参考RtpUnpackerAac那边的代码和注释
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//
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// 简单来说，aac的rtp包分为三个部分，
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// 第一部分描述了au头的个数，
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// 第二部分是au头的数组，每个au头固定两字节，au头可以解析出每帧的大小
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// 第三部分是帧数据的数组
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if len(in) > maxSize {
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nazalog.Warnf("frame size bigger than rtp payload size while packing. len(in)=%d, maxSize=%d", len(in), maxSize)
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}
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auHeadersLength := 2 // auHeaderSize * nbAuHeaders = 2 * 1
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item := make([]byte, 4+len(in))
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item[0] = 0
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item[1] = uint8(auHeadersLength*8 - 7)
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item[2] = uint8(len(in) >> 5 & 0xFF)
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item[3] = uint8(len(in) & 0x1F)
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copy(item[4:], in)
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out = append(out, item)
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return
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}
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