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// Copyright 2020, 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/lal/pkg/base"
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// AAC格式的流，尝试合成一个完整的帧
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func (r *RTPUnpacker) unpackOneAAC() bool {
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first := r.list.head.next
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if first == nil {
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return false
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}
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// TODO chef:
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// 2. 只处理了一个RTP包含多个音频包的情况，没有处理一个音频包跨越多个RTP包的情况（是否有这种情况）
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// rfc3640 2.11. Global Structure of Payload Format
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//
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// +---------+-----------+-----------+---------------+
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// | RTP | AU Header | Auxiliary | Access Unit |
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// | Header | Section | Section | Data Section |
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// +---------+-----------+-----------+---------------+
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//
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// <----------RTP Packet Payload----------->
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//
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// rfc3640 3.2.1. The AU Header Section
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//
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
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// |AU-headers-length|AU-header|AU-header| |AU-header|padding|
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// | | (1) | (2) | | (n) | bits |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
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//
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// rfc3640 3.3.6. High Bit-rate AAC
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//
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b := first.packet.Raw[first.packet.Header.payloadOffset:]
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//nazalog.Debugf("%d, %d, %s", len(pkt.Raw), pkt.Header.timestamp, hex.Dump(b))
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// AU Header Section
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var auHeaderLength uint32
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auHeaderLength = uint32(b[0])<<8 + uint32(b[1])
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auHeaderLength = (auHeaderLength + 7) / 8
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//nazalog.Debugf("auHeaderLength=%d", auHeaderLength)
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// no Auxiliary Section
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pauh := uint32(2) // AU Header pos
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pau := uint32(2) + auHeaderLength // AU pos
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auNum := uint32(auHeaderLength) / 2
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for i := uint32(0); i < auNum; i++ {
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var auSize uint32
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auSize = uint32(b[pauh])<<8 | uint32(b[pauh+1]&0xF8) // 13bit
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auSize /= 8
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//auIndex := b[pauh+1] & 0x7
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// raw AAC frame
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// pau, auSize
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//nazalog.Debugf("%d %d %s", auSize, auIndex, hex.Dump(b[pau:pau+auSize]))
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var outPkt base.AVPacket
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outPkt.Timestamp = first.packet.Header.Timestamp / uint32(r.clockRate/1000)
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outPkt.Timestamp += i * uint32((1024*1000)/r.clockRate)
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outPkt.Payload = b[pau : pau+auSize]
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outPkt.PayloadType = r.payloadType
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r.onAVPacket(outPkt)
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pauh += 2
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pau += auSize
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}
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r.unpackedFlag = true
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r.unpackedSeq = first.packet.Header.Seq
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r.list.head.next = first.next
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r.list.size--
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return true
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}
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