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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 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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const (
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pullReadBufSize = 256
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writeGetParameterIntervalSec = 10
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)
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type PullSessionObserver interface {
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BaseInSessionObserver
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}
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type PullSessionOption struct {
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// 从调用Pull函数，到接收音视频数据的前一步，也即收到rtsp play response的超时时间
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// 如果为0，则没有超时时间
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PullTimeoutMS int
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OverTCP bool // 是否使用interleaved模式，也即是否通过rtsp command tcp连接传输rtp/rtcp数据
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}
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var defaultPullSessionOption = PullSessionOption{
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PullTimeoutMS: 10000,
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OverTCP: false,
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}
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type PullSession struct {
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baseInSession *BaseInSession
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UniqueKey string // const after ctor
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option PullSessionOption // const after ctor
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CmdConn connection.Connection
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cseq int
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sessionID string
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channel int
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rawURL string
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urlCtx base.URLContext
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waitErrChan chan error
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methodGetParameterSupported bool
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auth Auth
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}
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type ModPullSessionOption func(option *PullSessionOption)
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func NewPullSession(observer PullSessionObserver, modOptions ...ModPullSessionOption) *PullSession {
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option := defaultPullSessionOption
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for _, fn := range modOptions {
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fn(&option)
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}
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uk := base.GenUniqueKey(base.UKPRTSPPullSession)
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s := &PullSession{
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UniqueKey: uk,
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option: option,
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waitErrChan: make(chan error, 1),
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}
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baseInSession := &BaseInSession{
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UniqueKey: uk,
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stat: base.StatSession{
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Protocol: base.ProtocolRTSP,
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SessionID: uk,
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StartTime: time.Now().Format("2006-01-02 15:04:05.999"),
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},
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observer: observer,
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cmdSession: s,
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}
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s.baseInSession = baseInSession
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nazalog.Infof("[%s] lifecycle new rtsp PullSession. session=%p", uk, s)
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return s
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}
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// 如果没有错误发生，阻塞直到接收音视频数据的前一步，也即收到rtsp play response
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func (session *PullSession) Pull(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.PullTimeoutMS == 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.PullTimeoutMS)*time.Millisecond)
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}
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defer cancel()
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return session.pullContext(ctx, rawURL)
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}
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// Pull成功后，调用该函数，可阻塞直到拉流结束
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func (session *PullSession) Wait() <-chan error {
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return session.waitErrChan
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}
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func (session *PullSession) Write(channel int, b []byte) error {
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return nil
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}
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func (session *PullSession) Dispose() error {
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return nil
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}
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func (session *PullSession) AppName() string {
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return session.urlCtx.PathWithoutLastItem
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}
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func (session *PullSession) StreamName() string {
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return session.urlCtx.LastItemOfPath
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}
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func (session *PullSession) RawQuery() string {
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return session.urlCtx.RawQuery
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}
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// @return 注意，`RemoteAddr`字段返回的是RTSP command TCP连接的地址
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func (session *PullSession) GetStat() base.StatSession {
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return session.baseInSession.GetStat()
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}
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func (session *PullSession) UpdateStat(interval uint32) {
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session.baseInSession.UpdateStat(interval)
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}
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func (session *PullSession) IsAlive() (readAlive, writeAlive bool) {
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return session.baseInSession.IsAlive()
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}
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func (session *PullSession) pullContext(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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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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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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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 *PullSession) 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.CmdConn)
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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.baseInSession.HandleInterleavedPacket(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.CmdConn.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.CmdConn)
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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.CmdConn.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.baseInSession.HandleInterleavedPacket(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.CmdConn.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 *PullSession) 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.CmdConn = connection.New(conn, func(option *connection.Option) {
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option.ReadBufSize = pullReadBufSize
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})
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session.baseInSession.stat.RemoteAddr = conn.RemoteAddr().String()
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return nil
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}
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func (session *PullSession) 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.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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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. %s", session.UniqueKey, ctx.StatusCode)
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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 *PullSession) 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.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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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. code=%s, body=%s", session.UniqueKey, ctx.StatusCode, 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.baseInSession.InitWithSDP(ctx.Body, sdpLogicCtx)
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return nil
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}
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func (session *PullSession) writeSetup() error {
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if session.baseInSession.sdpLogicCtx.VideoAControl != "" {
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if session.option.OverTCP {
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if err := session.writeOneSetupTCP(session.baseInSession.sdpLogicCtx.VideoAControl); 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(session.baseInSession.sdpLogicCtx.VideoAControl); err != nil {
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return err
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}
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}
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}
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if session.baseInSession.sdpLogicCtx.AudioAControl != "" {
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if session.option.OverTCP {
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if err := session.writeOneSetupTCP(session.baseInSession.sdpLogicCtx.AudioAControl); 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(session.baseInSession.sdpLogicCtx.AudioAControl); 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 *PullSession) writeOneSetup(aControl string) error {
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setupURI := makeSetupURI(session.urlCtx, aControl)
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rtpC, rtpPort, rtcpC, rtcpPort, 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(rtpPort), int(rtcpPort), session.sessionID, auth)
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nazalog.Debugf("[%s] > write setup.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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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. code=%s, ctx=%+v", session.UniqueKey, ctx.StatusCode, ctx)
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session.sessionID = strings.Split(ctx.Headers[HeaderFieldSession], ";")[0]
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srvRTPPort, srvRTCPPort, 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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rtpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
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option.Conn = rtpC
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option.RAddr = net.JoinHostPort(session.urlCtx.Host, fmt.Sprintf("%d", srvRTPPort))
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option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
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})
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if err != nil {
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return err
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}
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rtcpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
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option.Conn = rtcpC
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option.RAddr = net.JoinHostPort(session.urlCtx.Host, fmt.Sprintf("%d", srvRTCPPort))
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option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
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})
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if err != nil {
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return err
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}
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if err := session.baseInSession.SetupWithConn(setupURI, rtpConn, rtcpConn); 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 *PullSession) writeOneSetupTCP(aControl string) error {
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setupURI := makeSetupURI(session.urlCtx, aControl)
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rtpChannel := session.channel
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rtcpChannel := session.channel + 1
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session.channel += 2
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session.cseq++
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auth := session.auth.MakeAuthorization(MethodSetup, session.urlCtx.RawURLWithoutUserInfo)
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req := PackRequestSetupTCP(setupURI, session.cseq, rtpChannel, rtcpChannel, session.sessionID, auth)
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nazalog.Debugf("[%s] > write setup.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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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. code=%s, ctx=%+v", session.UniqueKey, ctx.StatusCode, ctx)
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session.sessionID = strings.Split(ctx.Headers[HeaderFieldSession], ";")[0]
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// 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
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if err := session.baseInSession.SetupWithChannel(setupURI, rtpChannel, rtcpChannel); err != nil {
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return err
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|
}
|
|
|
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *PullSession) writePlay() error {
|
|
|
session.baseInSession.WriteRTPRTCPDummy()
|
|
|
|
|
|
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.CmdConn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. %s", session.UniqueKey, ctx.StatusCode)
|
|
|
return nil
|
|
|
}
|
|
|
|
|
|
func (session *PullSession) handleOptionMethods(ctx nazahttp.HTTPRespMsgCtx) {
|
|
|
methods := ctx.Headers["Public"]
|
|
|
if methods == "" {
|
|
|
return
|
|
|
}
|
|
|
|
|
|
if strings.Contains(methods, MethodGetParameter) {
|
|
|
session.methodGetParameterSupported = true
|
|
|
}
|
|
|
}
|
|
|
|
|
|
func (session *PullSession) 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.CmdConn.Write([]byte(req)); err != nil {
|
|
|
return err
|
|
|
}
|
|
|
ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
|
|
|
if err != nil {
|
|
|
return err
|
|
|
}
|
|
|
nazalog.Debugf("[%s] < read response. %s", session.UniqueKey, ctx.StatusCode)
|
|
|
return nil
|
|
|
}
|