mirror of
https://github.com/Monibuca/plugin-rtmp.git
synced 2025-09-27 03:58:28 +08:00
390 lines
11 KiB
Go
390 lines
11 KiB
Go
package rtmp
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import (
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"bufio"
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"encoding/binary"
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"errors"
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"io"
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"net"
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. "m7s.live/engine/v4"
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"m7s.live/engine/v4/util"
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)
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const (
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SEND_CHUNK_SIZE_MESSAGE = "Send Chunk Size Message"
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SEND_ACK_MESSAGE = "Send Acknowledgement Message"
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SEND_ACK_WINDOW_SIZE_MESSAGE = "Send Window Acknowledgement Size Message"
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SEND_SET_PEER_BANDWIDTH_MESSAGE = "Send Set Peer Bandwidth Message"
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SEND_STREAM_BEGIN_MESSAGE = "Send Stream Begin Message"
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SEND_SET_BUFFER_LENGTH_MESSAGE = "Send Set Buffer Lengh Message"
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SEND_STREAM_IS_RECORDED_MESSAGE = "Send Stream Is Recorded Message"
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SEND_PING_REQUEST_MESSAGE = "Send Ping Request Message"
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SEND_PING_RESPONSE_MESSAGE = "Send Ping Response Message"
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SEND_CONNECT_MESSAGE = "Send Connect Message"
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SEND_CONNECT_RESPONSE_MESSAGE = "Send Connect Response Message"
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SEND_CREATE_STREAM_MESSAGE = "Send Create Stream Message"
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SEND_PLAY_MESSAGE = "Send Play Message"
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SEND_PLAY_RESPONSE_MESSAGE = "Send Play Response Message"
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SEND_PUBLISH_RESPONSE_MESSAGE = "Send Publish Response Message"
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SEND_PUBLISH_START_MESSAGE = "Send Publish Start Message"
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SEND_UNPUBLISH_RESPONSE_MESSAGE = "Send Unpublish Response Message"
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SEND_AUDIO_MESSAGE = "Send Audio Message"
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SEND_FULL_AUDIO_MESSAGE = "Send Full Audio Message"
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SEND_VIDEO_MESSAGE = "Send Video Message"
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SEND_FULL_VDIEO_MESSAGE = "Send Full Video Message"
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)
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func newConnectResponseMessageData(objectEncoding float64) (amfobj AMFObject) {
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amfobj = make(AMFObject)
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amfobj["fmsVer"] = "monibuca/" + Engine.Version
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amfobj["capabilities"] = 31
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amfobj["mode"] = 1
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amfobj["Author"] = "dexter"
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amfobj["level"] = Level_Status
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amfobj["code"] = NetConnection_Connect_Success
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amfobj["objectEncoding"] = uint64(objectEncoding)
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return
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}
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func newPublishResponseMessageData(streamid uint32, code, level string) (amfobj AMFObject) {
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amfobj = make(AMFObject)
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amfobj["code"] = code
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amfobj["level"] = level
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amfobj["streamid"] = streamid
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return
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}
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func newPlayResponseMessageData(streamid uint32, code, level string) (amfobj AMFObject) {
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amfobj = make(AMFObject)
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amfobj["code"] = code
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amfobj["level"] = level
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amfobj["streamid"] = streamid
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return
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}
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type NetConnection struct {
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*bufio.Reader `json:"-"`
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net.Conn `json:"-"`
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bandwidth uint32
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readSeqNum uint32 // 当前读的字节
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writeSeqNum uint32 // 当前写的字节
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totalWrite uint32 // 总共写了多少字节
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totalRead uint32 // 总共读了多少字节
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writeChunkSize int
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readChunkSize int
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incompleteRtmpBody map[uint32]*util.Buffer // 完整的RtmpBody,在网络上是被分成一块一块的,需要将其组装起来
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rtmpHeader map[uint32]*ChunkHeader // RtmpHeader
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objectEncoding float64
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appName string
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tmpBuf []byte //用来接收小数据，复用内存
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}
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func (conn *NetConnection) ReadFull(buf []byte) (n int, err error) {
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return io.ReadFull(conn.Reader, buf)
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}
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func (conn *NetConnection) SendStreamID(eventType uint16, streamID uint32) (err error) {
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return conn.SendMessage(RTMP_MSG_USER_CONTROL, &StreamIDMessage{UserControlMessage{EventType: eventType}, streamID})
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}
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func (conn *NetConnection) SendUserControl(eventType uint16) error {
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return conn.SendMessage(RTMP_MSG_USER_CONTROL, &UserControlMessage{EventType: eventType})
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}
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func (conn *NetConnection) ResponseCreateStream(tid uint64, streamID uint32) error {
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m := &ResponseCreateStreamMessage{}
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m.CommandName = Response_Result
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m.TransactionId = tid
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m.StreamId = streamID
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return conn.SendMessage(RTMP_MSG_AMF0_COMMAND, m)
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}
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// func (conn *NetConnection) SendCommand(message string, args any) error {
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// switch message {
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// // case SEND_SET_BUFFER_LENGTH_MESSAGE:
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// // if args != nil {
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// // return errors.New(SEND_SET_BUFFER_LENGTH_MESSAGE + ", The parameter is nil")
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// // }
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// // m := new(SetBufferMessage)
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// // m.EventType = RTMP_USER_SET_BUFFLEN
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// // m.Millisecond = 100
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// // m.StreamID = conn.streamID
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// // return conn.writeMessage(RTMP_MSG_USER_CONTROL, m)
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// }
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// return errors.New("send message no exist")
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// }
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func (conn *NetConnection) readChunk() (msg *Chunk, err error) {
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head, err := conn.ReadByte()
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conn.readSeqNum++
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if err != nil {
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return nil, err
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}
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ChunkStreamID := uint32(head & 0x3f) // 0011 1111
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ChunkType := head >> 6 // 1100 0000
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// 如果块流ID为0,1的话,就需要计算.
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ChunkStreamID, err = conn.readChunkStreamID(ChunkStreamID)
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if err != nil {
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return nil, errors.New("get chunk stream id error :" + err.Error())
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}
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h, ok := conn.rtmpHeader[ChunkStreamID]
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if !ok {
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h = &ChunkHeader{
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ChunkBasicHeader: ChunkBasicHeader{
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ChunkStreamID,
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ChunkType,
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},
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}
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conn.rtmpHeader[ChunkStreamID] = h
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}
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currentBody, ok := conn.incompleteRtmpBody[ChunkStreamID]
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if ChunkType != 3 && ok && currentBody.Len() > 0 {
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// 如果块类型不为3,那么这个rtmp的body应该为空.
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return nil, errors.New("incompleteRtmpBody error")
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}
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if err = conn.readChunkType(h, ChunkType); err != nil {
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return nil, errors.New("get chunk type error :" + err.Error())
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}
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msgLen := int(h.MessageLength)
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if !ok {
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newBuffer := util.Buffer(make([]byte, 0, msgLen))
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currentBody = &newBuffer
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conn.incompleteRtmpBody[ChunkStreamID] = currentBody
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}
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needRead := conn.readChunkSize
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if unRead := msgLen - currentBody.Len(); unRead < needRead {
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needRead = unRead
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}
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if n, err := conn.ReadFull(currentBody.Malloc(needRead)); err != nil {
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return nil, err
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} else {
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conn.readSeqNum += uint32(n)
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}
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// 如果读完了一个完整的块,那么就返回这个消息,没读完继续递归读块.
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if currentBody.Len() == msgLen {
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msg = &Chunk{
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ChunkHeader: *h,
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Body: currentBody.ReadN(msgLen),
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}
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err = GetRtmpMessage(msg)
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}
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return
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}
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func (conn *NetConnection) readChunkStreamID(csid uint32) (chunkStreamID uint32, err error) {
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chunkStreamID = csid
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switch csid {
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case 0:
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{
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u8, err := conn.ReadByte()
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conn.readSeqNum++
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if err != nil {
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return 0, err
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}
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chunkStreamID = 64 + uint32(u8)
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}
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case 1:
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{
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u16_0, err1 := conn.ReadByte()
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if err1 != nil {
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return 0, err1
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}
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u16_1, err1 := conn.ReadByte()
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if err1 != nil {
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return 0, err1
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}
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conn.readSeqNum += 2
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chunkStreamID = 64 + uint32(u16_0) + (uint32(u16_1) << 8)
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}
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}
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return chunkStreamID, nil
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}
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func (conn *NetConnection) readChunkType(h *ChunkHeader, chunkType byte) (err error) {
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b := conn.tmpBuf[:3]
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switch chunkType {
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case 0:
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{
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// Timestamp 3 bytes
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if _, err := conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 3
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util.GetBE(b, &h.Timestamp) //type = 0的时间戳为绝对时间,其他的都为相对时间
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// Message Length 3 bytes
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if _, err = conn.ReadFull(b); err != nil { // 读取Message Length,这里的长度指的是一条信令或者一帧视频数据或音频数据的长度,而不是Chunk data的长度.
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return err
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}
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conn.readSeqNum += 3
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util.GetBE(b, &h.MessageLength)
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// Message Type ID 1 bytes
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v, err := conn.ReadByte() // 读取Message Type ID
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if err != nil {
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return err
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}
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conn.readSeqNum++
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h.MessageTypeID = v
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// Message Stream ID 4bytes
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b = conn.tmpBuf
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if _, err = conn.ReadFull(b); err != nil { // 读取Message Stream ID
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return err
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}
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conn.readSeqNum += 4
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h.MessageStreamID = binary.LittleEndian.Uint32(b)
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// ExtendTimestamp 4 bytes
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if h.Timestamp == 0xffffff { // 对于type 0的chunk,绝对时间戳在这里表示,如果时间戳值大于等于0xffffff(16777215),该值必须是0xffffff,且时间戳扩展字段必须发送,其他情况没有要求
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if _, err = conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 4
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util.GetBE(b, &h.ExtendTimestamp)
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}
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}
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case 1:
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{
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// Timestamp 3 bytes
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if _, err = conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 3
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h.ChunkType = chunkType
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util.GetBE(b, &h.Timestamp)
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// Message Length 3 bytes
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if _, err = conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 3
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util.GetBE(b, &h.MessageLength)
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// Message Type ID 1 bytes
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v, err := conn.ReadByte()
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if err != nil {
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return err
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}
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conn.readSeqNum++
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h.MessageTypeID = v
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// ExtendTimestamp 4 bytes
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if h.Timestamp == 0xffffff {
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b = conn.tmpBuf
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if _, err := conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 4
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util.GetBE(b, &h.ExtendTimestamp)
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}
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}
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case 2:
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{
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// Timestamp 3 bytes
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if _, err = conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 3
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h.ChunkType = chunkType
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util.GetBE(b, &h.Timestamp)
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// ExtendTimestamp 4 bytes
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if h.Timestamp == 0xffffff {
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b = conn.tmpBuf
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if _, err := conn.ReadFull(b); err != nil {
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return err
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}
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conn.readSeqNum += 4
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util.GetBE(b, &h.ExtendTimestamp)
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}
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}
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case 3:
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{
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//h.ChunkType = chunkType
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}
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}
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return nil
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}
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func (conn *NetConnection) RecvMessage() (msg *Chunk, err error) {
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if conn.readSeqNum >= conn.bandwidth {
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conn.totalRead += conn.readSeqNum
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conn.readSeqNum = 0
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err = conn.SendMessage(RTMP_MSG_ACK, Uint32Message(conn.totalRead))
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}
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for msg == nil && err == nil {
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if msg, err = conn.readChunk(); msg != nil {
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switch msg.MessageTypeID {
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case RTMP_MSG_CHUNK_SIZE:
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conn.readChunkSize = int(msg.MsgData.(Uint32Message))
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case RTMP_MSG_ABORT:
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delete(conn.incompleteRtmpBody, uint32(msg.MsgData.(Uint32Message)))
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case RTMP_MSG_ACK, RTMP_MSG_EDGE:
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case RTMP_MSG_USER_CONTROL:
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if _, ok := msg.MsgData.(*PingRequestMessage); ok {
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conn.SendUserControl(RTMP_USER_PING_RESPONSE)
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}
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case RTMP_MSG_ACK_SIZE:
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conn.bandwidth = uint32(msg.MsgData.(Uint32Message))
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case RTMP_MSG_BANDWIDTH:
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conn.bandwidth = msg.MsgData.(*SetPeerBandwidthMessage).AcknowledgementWindowsize
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case RTMP_MSG_AMF0_COMMAND, RTMP_MSG_AUDIO, RTMP_MSG_VIDEO:
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return msg, err
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}
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}
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}
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return
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}
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func (conn *NetConnection) SendMessage(t byte, msg RtmpMessage) (err error) {
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body := msg.Encode()
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head := newChunkHeader(t)
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head.MessageLength = uint32(len(body))
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if sid, ok := msg.(HaveStreamID); ok {
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head.MessageStreamID = sid.GetStreamID()
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}
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if conn.writeSeqNum > conn.bandwidth {
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conn.totalWrite += conn.writeSeqNum
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conn.writeSeqNum = 0
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err = conn.SendMessage(RTMP_MSG_ACK, Uint32Message(conn.totalWrite))
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err = conn.SendStreamID(RTMP_USER_PING_REQUEST, 0)
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}
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var chunk = net.Buffers{conn.encodeChunk12(head)}
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if len(body) > conn.writeChunkSize {
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chunk = append(chunk, body[:conn.writeChunkSize])
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body = body[conn.writeChunkSize:]
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conn.writeSeqNum += uint32(util.SizeOfBuffers(chunk))
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_, err = chunk.WriteTo(conn)
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for len(body) > conn.writeChunkSize {
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chunk = append(chunk[:0], conn.encodeChunk12(head), body[:conn.writeChunkSize])
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body = body[conn.writeChunkSize:]
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conn.writeSeqNum += uint32(util.SizeOfBuffers(chunk))
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_, err = chunk.WriteTo(conn)
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}
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chunk = append(chunk[:0], conn.encodeChunk12(head), body)
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conn.writeSeqNum += uint32(util.SizeOfBuffers(chunk))
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_, err = chunk.WriteTo(conn)
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} else {
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chunk = append(chunk, body)
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conn.writeSeqNum += uint32(util.SizeOfBuffers(chunk))
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_, err = chunk.WriteTo(conn)
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}
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return nil
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}
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