stream/mts: patch for revid.Start() no exit bug

revid/revid.go

@@ -120,6 +120,8 @@ type Revid struct {
 
 	// isRunning is a loaded and cocked foot-gun.
 	isRunning bool
+
+	err chan error
 }
 
 // packer takes data segments and packs them into clips
@@ -176,13 +178,29 @@ func (p *packer) Write(frame []byte) (int, error) {
 // New returns a pointer to a new Revid with the desired configuration, and/or
 // an error if construction of the new instance was not successful.
 func New(c Config, ns *netsender.Sender) (*Revid, error) {
-	r := Revid{ns: ns}
+	r := Revid{ns: ns, err: make(chan error)}
 	r.buffer = ring.NewBuffer(ringBufferSize, ringBufferElementSize, writeTimeout)
 	r.packer.owner = &r
 	err := r.reset(c)
 	if err != nil {
 		return nil, err
 	}
+	go func() {
+		for {
+			err := <-r.err
+			if err != nil {
+				r.config.Logger.Log(logger.Error, pkg+"async error", "error", err.Error())
+				err = r.Stop()
+				if err != nil {
+					r.config.Logger.Log(logger.Fatal, pkg+"failed to stop", "error", err.Error())
+				}
+				r.Start()
+				if err != nil {
+					r.config.Logger.Log(logger.Fatal, pkg+"failed to restart", "error", err.Error())
+				}
+			}
+		}
+	}()
 	return &r, nil
 }
 
@@ -312,8 +330,8 @@ func (r *Revid) Start() error {
 	r.config.Logger.Log(logger.Info, pkg+"starting output routine")
 	go r.outputClips()
 	r.config.Logger.Log(logger.Info, pkg+"setting up input and receiving content")
-	err := r.setupInput()
-	return err
+	go r.setupInput()
+	return nil
 }
 
 // Stop halts any processing of video data from a camera or file
@@ -474,11 +492,13 @@ func (r *Revid) startRaspivid() error {
 		r.config.Logger.Log(logger.Fatal, pkg+"cannot start raspivid", "error", err.Error())
 	}
 
+	go func() {
 		r.config.Logger.Log(logger.Info, pkg+"reading camera data")
 		delay := time.Second / time.Duration(r.config.FrameRate)
-	err = r.lexTo(r.encoder, stdout, delay)
+		r.err <- r.lexTo(r.encoder, stdout, delay)
 		r.config.Logger.Log(logger.Info, pkg+"finished reading camera data")
-	return err
+	}()
+	return nil
 }
 
 func (r *Revid) startV4L() error {
@@ -526,10 +546,12 @@ func (r *Revid) startV4L() error {
 		return err
 	}
 
+	go func() {
 		r.config.Logger.Log(logger.Info, pkg+"reading camera data")
-	err = r.lexTo(r.encoder, stdout, delay)
+		r.err <- r.lexTo(r.encoder, stdout, delay)
 		r.config.Logger.Log(logger.Info, pkg+"finished reading camera data")
-	return err
+	}()
+	return nil
 }
 
 // setupInputForFile sets things up for getting input from a file
@@ -544,5 +566,8 @@ func (r *Revid) setupInputForFile() error {
 	defer f.Close()
 
 	// TODO(kortschak): Maybe we want a context.Context-aware parser that we can stop.
-	return r.lexTo(r.encoder, f, delay)
+	go func() {
+		r.err <- r.lexTo(r.encoder, f, delay)
+	}()
+	return nil
 }