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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 rtsp
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import (
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"bufio"
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"context"
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"fmt"
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"net"
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"strings"
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"time"
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"github.com/q191201771/lal/pkg/base"
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"github.com/q191201771/lal/pkg/rtprtcp"
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"github.com/q191201771/lal/pkg/sdp"
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"github.com/q191201771/naza/pkg/connection"
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"github.com/q191201771/naza/pkg/nazahttp"
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"github.com/q191201771/naza/pkg/nazalog"
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"github.com/q191201771/naza/pkg/nazanet"
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)
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type ClientCommandSessionType int
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const (
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readBufSize = 256
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writeGetParameterIntervalSec = 10
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)
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const (
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CCSTPullSession ClientCommandSessionType = iota
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CCSTPushSession
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)
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type ClientCommandSessionOption struct {
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DoTimeoutMS int
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OverTCP bool
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}
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var defaultClientCommandSessionOption = ClientCommandSessionOption{
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DoTimeoutMS: 10000,
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OverTCP: false,
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}
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type ClientCommandSessionObserver interface {
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OnConnectResult()
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// only for PullSession
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OnDescribeResponse(rawSDP []byte, sdpLogicCtx sdp.LogicContext)
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OnSetupWithConn(uri string, rtpConn, rtcpConn *nazanet.UDPConnection)
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OnSetupWithChannel(uri string, rtpChannel, rtcpChannel int)
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OnSetupResult()
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OnInterleavedPacket(packet []byte, channel int)
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}
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// Push和Pull共用，封装了客户端底层信令信令部分。
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// 业务方应该使用PushSession和PullSession，而不是直接使用ClientCommandSession，除非你确定要这么做。
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type ClientCommandSession struct {
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UniqueKey string
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t ClientCommandSessionType
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observer ClientCommandSessionObserver
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option ClientCommandSessionOption
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rawURL string
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urlCtx base.URLContext
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conn connection.Connection
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cseq int
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methodGetParameterSupported bool
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auth Auth
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rawSDP []byte
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sdpLogicCtx sdp.LogicContext
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sessionID string
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channel int
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waitErrChan chan error
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}
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type ModClientCommandSessionOption func(option *ClientCommandSessionOption)
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func NewClientCommandSession(t ClientCommandSessionType, uniqueKey string, observer ClientCommandSessionObserver, modOptions ...ModClientCommandSessionOption) *ClientCommandSession {
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option := defaultClientCommandSessionOption
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for _, fn := range modOptions {
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fn(&option)
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}
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s := &ClientCommandSession{
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t: t,
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UniqueKey: uniqueKey,
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observer: observer,
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option: option,
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waitErrChan: make(chan error, 1),
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}
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nazalog.Infof("[%s] lifecycle new rtsp ClientCommandSession. session=%p", uniqueKey, s)
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return s
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}
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// only for PushSession
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func (session *ClientCommandSession) InitWithSDP(rawSDP []byte, sdpLogicCtx sdp.LogicContext) {
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session.rawSDP = rawSDP
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session.sdpLogicCtx = sdpLogicCtx
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}
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func (session *ClientCommandSession) Do(rawURL string) error {
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var (
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ctx context.Context
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cancel context.CancelFunc
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)
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if session.option.DoTimeoutMS == 0 {
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ctx, cancel = context.WithCancel(context.Background())
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} else {
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ctx, cancel = context.WithTimeout(context.Background(), time.Duration(session.option.DoTimeoutMS)*time.Millisecond)
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}
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defer cancel()
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return session.doContext(ctx, rawURL)
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}
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func (session *ClientCommandSession) Wait() <-chan error {
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return session.waitErrChan
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}
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func (session *ClientCommandSession) Dispose() error {
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nazalog.Infof("[%s] lifecycle dispose rtsp ClientCommandSession. session=%p", session.UniqueKey, session)
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return session.conn.Close()
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}
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func (session *ClientCommandSession) WriteInterleavedPacket(packet []byte, channel int) error {
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_, err := session.conn.Write(packInterleaved(channel, packet))
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return err
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}
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func (session *ClientCommandSession) RemoteAddr() string {
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return session.conn.RemoteAddr().String()
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}
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func (session *ClientCommandSession) AppName() string {
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return session.urlCtx.PathWithoutLastItem
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}
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func (session *ClientCommandSession) StreamName() string {
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return session.urlCtx.LastItemOfPath
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}
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func (session *ClientCommandSession) RawQuery() string {
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return session.urlCtx.RawQuery
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}
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func (session *ClientCommandSession) doContext(ctx context.Context, rawURL string) error {
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errChan := make(chan error, 1)
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go func() {
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if err := session.connect(rawURL); err != nil {
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errChan <- err
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return
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}
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if err := session.writeOptions(); err != nil {
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errChan <- err
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return
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}
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switch session.t {
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case CCSTPullSession:
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if err := session.writeDescribe(); err != nil {
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errChan <- err
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return
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}
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if err := session.writeSetup(); err != nil {
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errChan <- err
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return
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}
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session.observer.OnSetupResult()
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if err := session.writePlay(); err != nil {
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errChan <- err
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return
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}
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case CCSTPushSession:
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if err := session.writeAnnounce(); err != nil {
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errChan <- err
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return
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}
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if err := session.writeSetup(); err != nil {
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errChan <- err
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return
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}
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session.observer.OnSetupResult()
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if err := session.writeRecord(); err != nil {
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errChan <- err
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return
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}
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}
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errChan <- nil
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}()
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select {
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case <-ctx.Done():
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return ctx.Err()
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case err := <-errChan:
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if err != nil {
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return err
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}
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}
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go session.runReadLoop()
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return nil
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}
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func (session *ClientCommandSession) runReadLoop() {
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if !session.methodGetParameterSupported {
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// TCP模式，需要收取数据进行处理
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if session.option.OverTCP {
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var r = bufio.NewReader(session.conn)
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for {
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isInterleaved, packet, channel, err := readInterleaved(r)
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if err != nil {
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session.waitErrChan <- err
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return
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}
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if isInterleaved {
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session.observer.OnInterleavedPacket(packet, int(channel))
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}
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}
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}
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// not over tcp
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// 接收TCP对端关闭FIN信号
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dummy := make([]byte, 1)
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_, err := session.conn.Read(dummy)
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session.waitErrChan <- err
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return
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}
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// 对端支持get_parameter，需要定时向对端发送get_parameter进行保活
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var r = bufio.NewReader(session.conn)
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t := time.NewTicker(writeGetParameterIntervalSec * time.Millisecond)
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defer t.Stop()
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if session.option.OverTCP {
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for {
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select {
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case <-t.C:
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session.cseq++
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req := PackRequestGetParameter(session.urlCtx.RawURLWithoutUserInfo, session.cseq, session.sessionID)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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session.waitErrChan <- err
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return
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}
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default:
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// noop
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}
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isInterleaved, packet, channel, err := readInterleaved(r)
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if err != nil {
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session.waitErrChan <- err
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return
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}
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if isInterleaved {
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session.observer.OnInterleavedPacket(packet, int(channel))
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} else {
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if _, err := nazahttp.ReadHTTPResponseMessage(r); err != nil {
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session.waitErrChan <- err
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return
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}
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}
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}
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}
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// not over tcp
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for {
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select {
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case <-t.C:
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session.cseq++
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req := PackRequestGetParameter(session.urlCtx.RawURLWithoutUserInfo, session.cseq, session.sessionID)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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session.waitErrChan <- err
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return
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}
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if _, err := nazahttp.ReadHTTPResponseMessage(r); err != nil {
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session.waitErrChan <- err
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return
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}
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default:
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// noop
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}
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}
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}
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func (session *ClientCommandSession) connect(rawURL string) (err error) {
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session.rawURL = rawURL
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session.urlCtx, err = base.ParseRTSPURL(rawURL)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] > tcp connect.", session.UniqueKey)
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// # 建立连接
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conn, err := net.Dial("tcp", session.urlCtx.HostWithPort)
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if err != nil {
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return err
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}
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session.conn = connection.New(conn, func(option *connection.Option) {
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option.ReadBufSize = readBufSize
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})
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nazalog.Debugf("[%s] < tcp connect. laddr=%s, raddr=%s", session.UniqueKey, conn.LocalAddr().String(), conn.RemoteAddr().String())
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session.observer.OnConnectResult()
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return nil
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}
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func (session *ClientCommandSession) writeOptions() error {
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session.cseq++
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req := PackRequestOptions(session.urlCtx.RawURLWithoutUserInfo, session.cseq, "")
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nazalog.Debugf("[%s] > write options.", session.UniqueKey)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
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session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
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session.handleOptionMethods(ctx)
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if err := session.handleAuth(ctx); err != nil {
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return err
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}
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return nil
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}
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func (session *ClientCommandSession) writeDescribe() error {
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session.cseq++
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auth := session.auth.MakeAuthorization(MethodDescribe, session.urlCtx.RawURLWithoutUserInfo)
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req := PackRequestDescribe(session.urlCtx.RawURLWithoutUserInfo, session.cseq, auth)
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nazalog.Debugf("[%s] > write describe.", session.UniqueKey)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
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session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
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sdpLogicCtx, err := sdp.ParseSDP2LogicContext(ctx.Body)
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if err != nil {
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return err
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}
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session.rawSDP = ctx.Body
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session.sdpLogicCtx = sdpLogicCtx
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session.observer.OnDescribeResponse(session.rawSDP, session.sdpLogicCtx)
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return nil
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}
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func (session *ClientCommandSession) writeAnnounce() error {
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session.cseq++
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auth := session.auth.MakeAuthorization(MethodDescribe, session.urlCtx.RawURLWithoutUserInfo)
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req := PackRequestAnnounce(session.urlCtx.RawURLWithoutUserInfo, session.cseq, string(session.rawSDP), auth)
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nazalog.Debugf("[%s] > write announce.", session.UniqueKey)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
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session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
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return nil
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}
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func (session *ClientCommandSession) writeSetup() error {
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if session.sdpLogicCtx.HasVideoAControl() {
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uri := session.sdpLogicCtx.MakeVideoSetupURI(session.urlCtx.RawURLWithoutUserInfo)
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if session.option.OverTCP {
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if err := session.writeOneSetupTCP(uri); err != nil {
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return err
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}
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} else {
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if err := session.writeOneSetup(uri); err != nil {
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return err
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}
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}
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}
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// can't else if
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if session.sdpLogicCtx.HasAudioAControl() {
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uri := session.sdpLogicCtx.MakeAudioSetupURI(session.urlCtx.RawURLWithoutUserInfo)
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if session.option.OverTCP {
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if err := session.writeOneSetupTCP(uri); err != nil {
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return err
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}
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} else {
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if err := session.writeOneSetup(uri); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (session *ClientCommandSession) writeOneSetup(setupURI string) error {
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rtpC, lRTPPort, rtcpC, lRTCPPort, err := availUDPConnPool.Acquire2()
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if err != nil {
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return err
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}
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session.cseq++
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auth := session.auth.MakeAuthorization(MethodSetup, session.urlCtx.RawURLWithoutUserInfo)
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req := PackRequestSetup(setupURI, session.cseq, int(lRTPPort), int(lRTCPPort), session.sessionID, auth)
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nazalog.Debugf("[%s] > write setup.", session.UniqueKey)
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if _, err := session.conn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
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session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
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session.sessionID = strings.Split(ctx.Headers[HeaderFieldSession], ";")[0]
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rRTPPort, rRTCPPort, err := parseServerPort(ctx.Headers[HeaderFieldTransport])
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] init conn. lRTPPort=%d, lRTCPPort=%d, rRTPPort=%d, rRTCPPort=%d",
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session.UniqueKey, lRTPPort, lRTCPPort, rRTPPort, rRTCPPort)
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rtpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
|
|
|
option.Conn = rtpC
|
|
|
option.RAddr = net.JoinHostPort(session.urlCtx.Host, fmt.Sprintf("%d", rRTPPort))
|
|
|
option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
|
|
|
})
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
|
|
|
rtcpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
|
|
|
option.Conn = rtcpC
|
|
|
option.RAddr = net.JoinHostPort(session.urlCtx.Host, fmt.Sprintf("%d", rRTCPPort))
|
|
|
option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
|
|
|
})
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
|
|
|
session.observer.OnSetupWithConn(setupURI, rtpConn, rtcpConn)
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *ClientCommandSession) writeOneSetupTCP(setupURI string) error {
|
|
|
rtpChannel := session.channel
|
|
|
rtcpChannel := session.channel + 1
|
|
|
session.channel += 2
|
|
|
|
|
|
session.cseq++
|
|
|
auth := session.auth.MakeAuthorization(MethodSetup, session.urlCtx.RawURLWithoutUserInfo)
|
|
|
req := PackRequestSetupTCP(setupURI, session.cseq, rtpChannel, rtcpChannel, session.sessionID, auth)
|
|
|
nazalog.Debugf("[%s] > write setup.", session.UniqueKey)
|
|
|
if _, err := session.conn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
|
|
|
session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
|
|
|
|
|
|
session.sessionID = strings.Split(ctx.Headers[HeaderFieldSession], ";")[0]
|
|
|
|
|
|
// TODO chef: 这里没有解析回传的channel id了，因为我假定了它和request中的是一致的
|
|
|
|
|
|
session.observer.OnSetupWithChannel(setupURI, rtpChannel, rtcpChannel)
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *ClientCommandSession) writePlay() error {
|
|
|
session.cseq++
|
|
|
auth := session.auth.MakeAuthorization(MethodPlay, session.urlCtx.RawURLWithoutUserInfo)
|
|
|
req := PackRequestPlay(session.urlCtx.RawURLWithoutUserInfo, session.cseq, session.sessionID, auth)
|
|
|
nazalog.Debugf("[%s] > write play.", session.UniqueKey)
|
|
|
if _, err := session.conn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
|
|
|
session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *ClientCommandSession) writeRecord() error {
|
|
|
session.cseq++
|
|
|
auth := session.auth.MakeAuthorization(MethodRecord, session.urlCtx.RawURLWithoutUserInfo)
|
|
|
req := PackRequestRecord(session.urlCtx.RawURLWithoutUserInfo, session.cseq, session.sessionID, auth)
|
|
|
nazalog.Debugf("[%s] > write record.", session.UniqueKey)
|
|
|
if _, err := session.conn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
|
|
|
session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
|
|
|
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *ClientCommandSession) handleOptionMethods(ctx nazahttp.HTTPRespMsgCtx) {
|
|
|
methods := ctx.Headers[HeaderPublic]
|
|
|
if methods == "" {
|
|
|
return
|
|
|
}
|
|
|
|
|
|
if strings.Contains(methods, MethodGetParameter) {
|
|
|
session.methodGetParameterSupported = true
|
|
|
}
|
|
|
}
|
|
|
|
|
|
func (session *ClientCommandSession) handleAuth(ctx nazahttp.HTTPRespMsgCtx) error {
|
|
|
if ctx.Headers[HeaderWWWAuthenticate] == "" {
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
session.auth.FeedWWWAuthenticate(ctx.Headers[HeaderWWWAuthenticate], session.urlCtx.Username, session.urlCtx.Password)
|
|
|
auth := session.auth.MakeAuthorization(MethodOptions, session.urlCtx.RawURLWithoutUserInfo)
|
|
|
|
|
|
session.cseq++
|
|
|
req := PackRequestOptions(session.urlCtx.RawURLWithoutUserInfo, session.cseq, auth)
|
|
|
nazalog.Debugf("[%s] > write options.", session.UniqueKey)
|
|
|
if _, err := session.conn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.conn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. version=%s, code=%s, reason=%s, headers=%+v, body=%s",
|
|
|
session.UniqueKey, ctx.Version, ctx.StatusCode, ctx.Reason, ctx.Headers, string(ctx.Body))
|
|
|
return nil
|
|
|
}
|