mirror of
https://github.com/Monibuca/plugin-rtmp.git
synced 2025-09-27 03:58:28 +08:00
320 lines
9.3 KiB
Go
320 lines
9.3 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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"runtime"
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"sync/atomic"
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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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type NetConnection struct {
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*bufio.Reader `json:"-" yaml:"-"`
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net.Conn `json:"-" yaml:"-"`
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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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incommingChunks map[uint32]*Chunk
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objectEncoding float64
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appName string
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tmpBuf util.Buffer //用来接收/发送小数据，复用内存
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chunkHeader util.Buffer
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bytePool util.BytesPool
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writing atomic.Bool // false 可写，true 不可写
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}
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func NewNetConnection(conn net.Conn) *NetConnection {
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return &NetConnection{
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Conn: conn,
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Reader: bufio.NewReader(conn),
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writeChunkSize: RTMP_DEFAULT_CHUNK_SIZE,
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readChunkSize: RTMP_DEFAULT_CHUNK_SIZE,
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incommingChunks: make(map[uint32]*Chunk),
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bandwidth: RTMP_MAX_CHUNK_SIZE << 3,
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tmpBuf: make(util.Buffer, 4),
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chunkHeader: make(util.Buffer, 0, 16),
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bytePool: make(util.BytesPool, 17),
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}
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}
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func (conn *NetConnection) ReadFull(buf []byte) (n int, err error) {
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n, err = io.ReadFull(conn.Reader, buf)
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if err == nil {
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conn.readSeqNum += uint32(n)
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}
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return
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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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if err != nil {
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return nil, err
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}
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conn.readSeqNum++
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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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// println("ChunkStreamID:", ChunkStreamID, "ChunkType:", ChunkType)
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chunk, ok := conn.incommingChunks[ChunkStreamID]
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if ChunkType != 3 && ok && chunk.AVData.Length > 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 !ok {
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chunk = &Chunk{}
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conn.incommingChunks[ChunkStreamID] = chunk
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}
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if err = conn.readChunkType(&chunk.ChunkHeader, 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(chunk.MessageLength)
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needRead := conn.readChunkSize
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if unRead := msgLen - chunk.AVData.ByteLength; unRead < needRead {
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needRead = unRead
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}
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mem := conn.bytePool.Get(needRead)
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if n, err := conn.ReadFull(mem.Value); err != nil {
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mem.Recycle()
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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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if chunk.AVData.Push(mem); chunk.AVData.ByteLength == msgLen {
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chunk.ChunkHeader.ExtendTimestamp += chunk.ChunkHeader.Timestamp
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msg = chunk
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switch chunk.MessageTypeID {
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case RTMP_MSG_AUDIO, RTMP_MSG_VIDEO:
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default:
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err = GetRtmpMessage(msg, msg.AVData.ToBytes())
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msg.AVData.Recycle()
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}
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conn.incommingChunks[ChunkStreamID] = &Chunk{
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ChunkHeader: chunk.ChunkHeader,
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}
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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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conn.tmpBuf.Reset()
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b4 := conn.tmpBuf.Malloc(4)
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b3 := b4[:3]
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if chunkType == 3 {
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// 3个字节的时间戳
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} else {
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// Timestamp 3 bytes
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if _, err = conn.ReadFull(b3); err != nil {
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return err
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}
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util.GetBE(b3, &h.Timestamp)
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if chunkType != 2 {
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if _, err = conn.ReadFull(b3); err != nil {
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return err
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}
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util.GetBE(b3, &h.MessageLength)
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// Message Type ID 1 bytes
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if h.MessageTypeID, err = conn.ReadByte(); err != nil {
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return err
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}
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conn.readSeqNum++
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if chunkType == 0 {
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// Message Stream ID 4bytes
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if _, err = conn.ReadFull(b4); err != nil { // 读取Message Stream ID
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return err
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}
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h.MessageStreamID = binary.LittleEndian.Uint32(b4)
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}
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}
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}
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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(b4); err != nil {
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return err
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}
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util.GetBE(b4, &h.Timestamp)
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}
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if chunkType == 0 {
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h.ExtendTimestamp = h.Timestamp
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h.Timestamp = 0
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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 && err == 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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println("read chunk size", conn.readChunkSize)
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case RTMP_MSG_ABORT:
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delete(conn.incommingChunks, 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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if conn == nil {
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return errors.New("connection is nil")
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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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for !conn.writing.CompareAndSwap(false, true) {
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runtime.Gosched()
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}
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defer conn.writing.Store(false)
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conn.tmpBuf.Reset()
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msg.Encode(&conn.tmpBuf)
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head := newChunkHeader(t)
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head.MessageLength = uint32(conn.tmpBuf.Len())
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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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head.WriteTo(RTMP_CHUNK_HEAD_12, &conn.chunkHeader)
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for _, chunk := range conn.tmpBuf.Split(conn.writeChunkSize) {
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conn.sendChunk(chunk)
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}
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return nil
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}
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func (conn *NetConnection) sendChunk(writeBuffer ...[]byte) error {
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if n, err := conn.Write(conn.chunkHeader); err != nil {
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return err
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} else {
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conn.writeSeqNum += uint32(n)
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}
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buf := net.Buffers(writeBuffer)
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n, err := buf.WriteTo(conn)
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conn.writeSeqNum += uint32(n)
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return err
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}
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