Merged in lexers-return-ioeof (pull request #330)

codec: lexers return ioeof

Approved-by: Alan Noble <anoble@gmail.com>
Approved-by: kortschak <dan@kortschak.io>

codec/h264/lex.go

@@ -66,7 +66,7 @@ func Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 	buf := make([]byte, len(h264Prefix), bufSize)
 	copy(buf, h264Prefix[:])
 	writeOut := false
-outer:
+
 	for {
 		var b byte
 		var err error
@@ -75,7 +75,10 @@ outer:
 			if err != io.EOF {
 				return err
 			}
-			break
+			if len(buf) != 0 {
+				return io.ErrUnexpectedEOF
+			}
+			return io.EOF
 		}
 
 		for n := 1; b == 0x0 && n < 4; n++ {
@@ -84,7 +87,7 @@ outer:
 				if err != io.EOF {
 					return err
 				}
-				break outer
+				return io.ErrUnexpectedEOF
 			}
 			buf = append(buf, b)
 
@@ -109,7 +112,7 @@ outer:
 				if err != io.EOF {
 					return err
 				}
-				break outer
+				return io.ErrUnexpectedEOF
 			}
 			buf = append(buf, b)
 
@@ -127,10 +130,4 @@ outer:
 			}
 		}
 	}
-	if len(buf) == len(h264Prefix) {
-		return nil
-	}
-	<-tick
-	_, err := dst.Write(buf)
-	return err
 }

codec/h265/lex.go

@@ -76,10 +76,14 @@ func (l *Lexer) Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 		n, err := src.Read(buf)
 		switch err {
 		case nil: // Do nothing.
-		case io.EOF:
-			return nil
 		default:
-			return fmt.Errorf("source read error: %w\n", err)
+			if err == io.EOF {
+				if l.buf.Len() == 0 {
+					return io.EOF
+				}
+				return io.ErrUnexpectedEOF
+			}
+			return err
 		}
 
 		// Get payload from RTP packet.
@@ -181,7 +185,7 @@ func (l *Lexer) handleFragmentation(d []byte) {
 	}
 }
 
-// handlePACI will handl PACI packets
+// handlePACI will handle PACI packets
 //
 // TODO: complete this
 func (l *Lexer) handlePACI(d []byte) {

codec/h265/lex_test.go

@@ -247,7 +247,9 @@ func TestLex(t *testing.T) {
 		r := &rtpReader{packets: test.packets}
 		d := &destination{}
 		err := NewLexer(test.donl).Lex(d, r, 0)
-		if err != nil {
+		switch err {
+		case nil, io.EOF: // Do nothing
+		default:
 			t.Fatalf("error lexing: %v\n", err)
 		}
 

codec/mjpeg/lex.go

@@ -60,12 +60,9 @@ func Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 		buf := make([]byte, 2, 4<<10)
 		n, err := r.Read(buf)
 		if n < 2 {
-			return nil
+			return io.ErrUnexpectedEOF
 		}
 		if err != nil {
-			if err == io.EOF {
-				return nil
-			}
 			return err
 		}
 		if !bytes.Equal(buf, []byte{0xff, 0xd8}) {
@@ -76,7 +73,7 @@ func Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 			b, err := r.ReadByte()
 			if err != nil {
 				if err == io.EOF {
-					return nil
+					return io.ErrUnexpectedEOF
 				}
 				return err
 			}

revid/revid.go

@@ -854,7 +854,13 @@ func (r *Revid) Update(vars map[string]string) error {
 // processFrom is run as a routine to read from a input data source, lex and
 // then send individual access units to revid's encoders.
 func (r *Revid) processFrom(read io.Reader, delay time.Duration) {
-	r.err <- r.lexTo(r.filters[0], read, delay)
-	r.cfg.Logger.Log(logger.Info, pkg+"finished lexing")
+	err := r.lexTo(r.filters[0], read, delay)
+	r.cfg.Logger.Log(logger.Debug, pkg+"finished lexing")
+	switch err {
+	case nil: // Do nothing.
+	case io.EOF: // TODO: handle this depending on loop mode.
+	default:
+		r.err <- err
+	}
 	r.wg.Done()
 }