587 lines
12 KiB
Go
587 lines
12 KiB
Go
// Package rtmp provides RTMP connectivity.
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package rtmp
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import (
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"fmt"
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"io"
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"net/url"
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"strings"
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"github.com/bluenviron/gortsplib/v3/pkg/formats"
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"github.com/notedit/rtmp/format/flv/flvio"
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"github.com/bluenviron/mediamtx/internal/rtmp/bytecounter"
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"github.com/bluenviron/mediamtx/internal/rtmp/handshake"
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"github.com/bluenviron/mediamtx/internal/rtmp/message"
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"github.com/bluenviron/mediamtx/internal/rtmp/tracks"
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)
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func resultIsOK1(res *message.CommandAMF0) bool {
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if len(res.Arguments) < 2 {
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return false
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}
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ma, ok := res.Arguments[1].(flvio.AMFMap)
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if !ok {
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return false
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}
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v, ok := ma.GetString("level")
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if !ok {
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return false
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}
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return v == "status"
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}
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func resultIsOK2(res *message.CommandAMF0) bool {
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if len(res.Arguments) < 2 {
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return false
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}
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v, ok := res.Arguments[1].(float64)
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if !ok {
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return false
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}
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return v == 1
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}
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func splitPath(u *url.URL) (app, stream string) {
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nu := *u
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nu.ForceQuery = false
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pathsegs := strings.Split(nu.RequestURI(), "/")
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if len(pathsegs) == 2 {
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app = pathsegs[1]
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}
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if len(pathsegs) == 3 {
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app = pathsegs[1]
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stream = pathsegs[2]
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}
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if len(pathsegs) > 3 {
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app = strings.Join(pathsegs[1:3], "/")
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stream = strings.Join(pathsegs[3:], "/")
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}
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return
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}
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func getTcURL(u *url.URL) string {
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app, _ := splitPath(u)
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nu, _ := url.Parse(u.String()) // perform a deep copy
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nu.RawQuery = ""
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nu.Path = "/"
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return nu.String() + app
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}
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func createURL(tcURL string, app string, play string) (*url.URL, error) {
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u, err := url.ParseRequestURI("/" + app + "/" + play)
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if err != nil {
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return nil, err
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}
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tu, err := url.Parse(tcURL)
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if err != nil {
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return nil, err
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}
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if tu.Host == "" {
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return nil, fmt.Errorf("invalid host")
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}
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u.Host = tu.Host
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if tu.Scheme == "" {
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return nil, fmt.Errorf("invalid scheme")
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}
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u.Scheme = tu.Scheme
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return u, nil
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}
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// Conn is a RTMP connection.
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type Conn struct {
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bc *bytecounter.ReadWriter
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mrw *message.ReadWriter
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}
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// NewConn initializes a connection.
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func NewConn(rw io.ReadWriter) *Conn {
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return &Conn{
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bc: bytecounter.NewReadWriter(rw),
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}
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}
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// BytesReceived returns the number of bytes received.
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func (c *Conn) BytesReceived() uint64 {
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return c.bc.Reader.Count()
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}
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// BytesSent returns the number of bytes sent.
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func (c *Conn) BytesSent() uint64 {
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return c.bc.Writer.Count()
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}
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func (c *Conn) readCommand() (*message.CommandAMF0, error) {
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for {
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msg, err := c.mrw.Read()
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if err != nil {
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return nil, err
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}
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if cmd, ok := msg.(*message.CommandAMF0); ok {
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return cmd, nil
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}
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}
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}
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func (c *Conn) readCommandResult(commandID int, commandName string, isValid func(*message.CommandAMF0) bool) error {
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for {
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msg, err := c.mrw.Read()
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if err != nil {
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return err
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}
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if cmd, ok := msg.(*message.CommandAMF0); ok {
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if cmd.CommandID == commandID && cmd.Name == commandName {
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if !isValid(cmd) {
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return fmt.Errorf("server refused connect request")
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}
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return nil
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}
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}
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}
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}
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// InitializeClient performs the initialization of a client-side connection.
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func (c *Conn) InitializeClient(u *url.URL, isPublishing bool) error {
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connectpath, actionpath := splitPath(u)
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err := handshake.DoClient(c.bc, false)
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if err != nil {
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return err
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}
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c.mrw = message.NewReadWriter(c.bc, false)
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err = c.mrw.Write(&message.SetWindowAckSize{
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Value: 2500000,
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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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err = c.mrw.Write(&message.SetPeerBandwidth{
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Value: 2500000,
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Type: 2,
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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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err = c.mrw.Write(&message.SetChunkSize{
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Value: 65536,
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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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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 3,
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Name: "connect",
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CommandID: 1,
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Arguments: []interface{}{
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flvio.AMFMap{
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{K: "app", V: connectpath},
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{K: "flashVer", V: "LNX 9,0,124,2"},
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{K: "tcUrl", V: getTcURL(u)},
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{K: "fpad", V: false},
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{K: "capabilities", V: 15},
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{K: "audioCodecs", V: 4071},
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{K: "videoCodecs", V: 252},
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{K: "videoFunction", V: 1},
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},
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},
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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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err = c.readCommandResult(1, "_result", resultIsOK1)
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if err != nil {
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return err
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}
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if !isPublishing {
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 3,
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Name: "createStream",
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CommandID: 2,
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Arguments: []interface{}{
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nil,
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},
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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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err = c.readCommandResult(2, "_result", resultIsOK2)
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if err != nil {
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return err
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}
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err = c.mrw.Write(&message.UserControlSetBufferLength{
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BufferLength: 0x64,
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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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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 4,
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MessageStreamID: 0x1000000,
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Name: "play",
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CommandID: 3,
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Arguments: []interface{}{
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nil,
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actionpath,
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},
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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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return c.readCommandResult(3, "onStatus", resultIsOK1)
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 3,
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Name: "releaseStream",
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CommandID: 2,
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Arguments: []interface{}{
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nil,
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actionpath,
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},
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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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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 3,
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Name: "FCPublish",
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CommandID: 3,
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Arguments: []interface{}{
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nil,
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actionpath,
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},
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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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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 3,
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Name: "createStream",
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CommandID: 4,
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Arguments: []interface{}{
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nil,
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},
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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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err = c.readCommandResult(4, "_result", resultIsOK2)
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if err != nil {
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return err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 4,
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MessageStreamID: 0x1000000,
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Name: "publish",
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CommandID: 5,
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Arguments: []interface{}{
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nil,
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actionpath,
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connectpath,
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},
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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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return c.readCommandResult(5, "onStatus", resultIsOK1)
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}
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// InitializeServer performs the initialization of a server-side connection.
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func (c *Conn) InitializeServer() (*url.URL, bool, error) {
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err := handshake.DoServer(c.bc, false)
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if err != nil {
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return nil, false, err
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}
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c.mrw = message.NewReadWriter(c.bc, false)
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cmd, err := c.readCommand()
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if err != nil {
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return nil, false, err
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}
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if cmd.Name != "connect" {
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return nil, false, fmt.Errorf("unexpected command: %+v", cmd)
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}
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if len(cmd.Arguments) < 1 {
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return nil, false, fmt.Errorf("invalid connect command: %+v", cmd)
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}
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ma, ok := cmd.Arguments[0].(flvio.AMFMap)
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if !ok {
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return nil, false, fmt.Errorf("invalid connect command: %+v", cmd)
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}
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connectpath, ok := ma.GetString("app")
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if !ok {
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return nil, false, fmt.Errorf("invalid connect command: %+v", cmd)
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}
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tcURL, ok := ma.GetString("tcUrl")
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if !ok {
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tcURL, ok = ma.GetString("tcurl")
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if !ok {
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return nil, false, fmt.Errorf("invalid connect command: %+v", cmd)
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}
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}
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tcURL = strings.Trim(tcURL, "'")
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err = c.mrw.Write(&message.SetWindowAckSize{
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Value: 2500000,
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.SetPeerBandwidth{
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Value: 2500000,
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Type: 2,
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.SetChunkSize{
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Value: 65536,
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})
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if err != nil {
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return nil, false, err
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}
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oe, _ := ma.GetFloat64("objectEncoding")
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: cmd.ChunkStreamID,
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Name: "_result",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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flvio.AMFMap{
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{K: "fmsVer", V: "LNX 9,0,124,2"},
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{K: "capabilities", V: float64(31)},
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},
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetConnection.Connect.Success"},
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{K: "description", V: "Connection succeeded."},
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{K: "objectEncoding", V: oe},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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for {
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cmd, err := c.readCommand()
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if err != nil {
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return nil, false, err
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}
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switch cmd.Name {
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case "createStream":
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: cmd.ChunkStreamID,
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Name: "_result",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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nil,
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float64(1),
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},
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})
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if err != nil {
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return nil, false, err
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}
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case "play":
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if len(cmd.Arguments) < 2 {
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return nil, false, fmt.Errorf("invalid play command arguments")
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}
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actionpath, ok := cmd.Arguments[1].(string)
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if !ok {
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return nil, false, fmt.Errorf("invalid play command arguments")
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}
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u, err := createURL(tcURL, connectpath, actionpath)
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.UserControlStreamIsRecorded{
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StreamID: 1,
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.UserControlStreamBegin{
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StreamID: 1,
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 5,
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MessageStreamID: 0x1000000,
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Name: "onStatus",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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nil,
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetStream.Play.Reset"},
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{K: "description", V: "play reset"},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 5,
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MessageStreamID: 0x1000000,
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Name: "onStatus",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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nil,
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetStream.Play.Start"},
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{K: "description", V: "play start"},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 5,
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MessageStreamID: 0x1000000,
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Name: "onStatus",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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nil,
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetStream.Data.Start"},
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{K: "description", V: "data start"},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 5,
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MessageStreamID: 0x1000000,
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Name: "onStatus",
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CommandID: cmd.CommandID,
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Arguments: []interface{}{
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nil,
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetStream.Play.PublishNotify"},
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{K: "description", V: "publish notify"},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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return u, false, nil
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case "publish":
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if len(cmd.Arguments) < 2 {
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return nil, false, fmt.Errorf("invalid publish command arguments")
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}
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actionpath, ok := cmd.Arguments[1].(string)
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if !ok {
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return nil, false, fmt.Errorf("invalid publish command arguments")
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}
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u, err := createURL(tcURL, connectpath, actionpath)
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if err != nil {
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return nil, false, err
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}
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err = c.mrw.Write(&message.CommandAMF0{
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ChunkStreamID: 5,
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Name: "onStatus",
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CommandID: cmd.CommandID,
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MessageStreamID: 0x1000000,
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Arguments: []interface{}{
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nil,
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flvio.AMFMap{
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{K: "level", V: "status"},
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{K: "code", V: "NetStream.Publish.Start"},
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{K: "description", V: "publish start"},
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},
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},
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})
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if err != nil {
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return nil, false, err
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}
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return u, true, nil
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}
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}
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}
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|
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// ReadMessage reads a message.
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func (c *Conn) ReadMessage() (message.Message, error) {
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return c.mrw.Read()
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}
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|
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// WriteMessage writes a message.
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func (c *Conn) WriteMessage(msg message.Message) error {
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return c.mrw.Write(msg)
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}
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|
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// ReadTracks reads track informations.
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// It returns the video track and the audio track.
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func (c *Conn) ReadTracks() (formats.Format, formats.Format, error) {
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return tracks.Read(c.mrw)
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}
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|
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// WriteTracks writes track informations.
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func (c *Conn) WriteTracks(videoTrack formats.Format, audioTrack formats.Format) error {
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return tracks.Write(c.mrw, videoTrack, audioTrack)
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}
|