67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
/*
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Copyright 2024 Josh Deprez
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package rtmp
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import "fmt"
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const (
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FunctionRequest = 1
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FunctionRDRSplitHorizon = 2
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FunctionRDRComplete = 3
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FunctionLoopProbe = 4 // AURP Ch.4 pp 94
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)
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// RequestPacket represents an RTMP Request, Route Data Request, or Loop Probe.
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type RequestPacket struct {
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Function uint8
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Data []byte // only for LoopProbe
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}
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// Marshal marshals an RTMP Request or RTMP RDR packet.
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func (rp *RequestPacket) Marshal() ([]byte, error) {
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if rp.Function < 1 || rp.Function > 4 {
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return nil, fmt.Errorf("invalid RTMP request function %d", rp.Function)
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}
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if rp.Function == FunctionLoopProbe {
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return append([]byte{rp.Function, 0x00, 0x00, 0x00, 0x00}, rp.Data...), nil
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}
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if len(rp.Data) > 0 {
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return nil, fmt.Errorf("data field only valid for RTMP Loop Probe")
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}
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return []byte{rp.Function}, nil
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}
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// UnmarshalRequestPacket unmarshals an RTMP Request or RTMP RDR packet.
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func UnmarshalRequestPacket(data []byte) (*RequestPacket, error) {
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if len(data) < 1 {
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return nil, fmt.Errorf("invalid data length %d for RTMP request packet", len(data))
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}
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// Loop probes include four 0x00 bytes after the function.
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if data[0] == FunctionLoopProbe {
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if len(data) < 5 {
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return nil, fmt.Errorf("insufficient data length %d for RTMP Loop Probe", len(data))
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}
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return &RequestPacket{
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Function: data[0],
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Data: data[5:],
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}, nil
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}
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return &RequestPacket{
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Function: data[0],
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}, nil
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}
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