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ts_recorder.go
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ts_recorder.go
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package live
import (
"io"
"net"
"strings"
"time"
"github.com/eluv-io/avpipe"
)
type TsReader struct {
addr string // For example ":21001" (for localhost port 21001)
pktLimit int
w io.Writer
done chan bool
ErrChannel chan error
conn *net.UDPConn
}
// Deprecated
func NewTsReader(addr string, w io.Writer) *TsReader {
tsr := &TsReader{
addr: addr,
w: w,
ErrChannel: make(chan error, 10),
}
var err error
if strings.HasPrefix(addr, "/") || strings.HasPrefix(addr, "./") {
err = tsr.serveFromFile(w)
} else {
err = tsr.serveOneConnection(w)
}
if err != nil {
log.Error("TsReader failed", "err", err)
}
return tsr
}
// Deprecated: Reading UDP datagrams are done inside avpipe library and no need
// to create TsReader anymore (this makes handling different situations like
// stopping and cancelling a stream extremely difficult).
// NewTsReaderV2 creates a UDP MPEG-TS reader and returns a TsReader and an io.Reader
// Starts the necessary goroutines - when the returned reader is closed, it stops
// all goroutines and cleans up.
func NewTsReaderV2(addr string) (*TsReader, io.ReadWriteCloser, error) {
rwb := NewRWBuffer(100000)
tsr := &TsReader{
addr: addr,
w: rwb,
ErrChannel: make(chan error, 10),
}
var err error
if strings.HasPrefix(addr, "/") || strings.HasPrefix(addr, "./") {
err = tsr.serveFromFile(rwb)
} else {
err = tsr.serveOneConnection(rwb)
}
if err != nil {
log.Error("TsReader failed", "err", err)
}
return tsr, rwb, err
}
func (tsr *TsReader) serveOneConnection(w io.Writer) (err error) {
sAddr, err := net.ResolveUDPAddr("udp", tsr.addr)
if err != nil {
return
}
conn, err := net.ListenUDP("udp", sAddr)
if err != nil {
log.Error("Failed to listen UDP network ...", err)
return
}
// TODO: Make it a config param (RM)
err = conn.SetReadBuffer(16 * 1024 * 1024)
if err != nil {
log.Error("Failed to set UDP buffer size, continue ...", err)
}
log.Info("ts_recorder server accepted", "addr", tsr.addr)
var pc net.PacketConn
pc = conn
go func(tsr *TsReader) {
if err := readUdp(pc, w); err != nil {
log.Error("Failed reading UDP stream", "err", err)
tsr.ErrChannel <- err
}
}(tsr)
tsr.conn = conn
return
}
func (tsr *TsReader) Close() {
if tsr.conn != nil {
err := tsr.conn.Close()
if err != nil {
log.Warn("failed to close udp socket", err)
}
tsr.conn = nil
}
if closer, ok := tsr.w.(io.Closer); ok {
err := closer.Close()
if err != nil {
log.Warn("failed to close writer", err)
}
}
}
func readUdp(conn net.PacketConn, w io.Writer) error {
// Assume that Close() is implemented, and that writer is not used after
// this call
defer func() {
w.(io.WriteCloser).Close()
err := conn.Close()
log.Info("Closing UDP socket", "err", err, "addr", conn.LocalAddr().String())
}()
// Stop recording if nothing was read for timeout
timeout := 5 * time.Second
bytesRead := 0
buf := make([]byte, 65536)
first := true
for {
if err := conn.SetReadDeadline(time.Now().Add(timeout)); err != nil {
return err
}
n, sender, err := conn.ReadFrom(buf)
if first {
log.Info("UDP READ", "n", n, "err", err)
}
bytesRead += n
if err != nil {
if err.(net.Error).Timeout() {
if bytesRead == 0 {
continue // waiting for stream start
}
log.Error("Stopped receiving UDP packets",
"timeout", timeout, "bytesRead", bytesRead)
return avpipe.EAV_IO_TIMEOUT
}
log.Error("UDP read failed", "err", err, "sender", sender)
return err
}
t := time.Now()
bw, err := w.Write(buf[:n])
if first {
log.Info("UDP WRITE", "bw", bw, "err", err)
first = false
}
if err != nil || bw != n {
log.Error("Failed to write UDP packet", "err", err, "bw", bw, "n", n, "sender", sender)
return err
}
if time.Since(t) > time.Millisecond*10 || bw > 1500 {
log.Warn("Writing UDP to avpipe took longer than expected", "timeSpent", time.Since(t), "written", bw)
}
}
return nil
}
func (tsr *TsReader) serveFromFile(w io.Writer) (err error) {
/* Not implemented */
return
}