Profiling es-split + fixes for probe (#49)

* Bytewise crc32

* Bump go-astikit to 0.30. Make crc32 generator. Remove old crc32 calculation func and corresponding tests/benchmarks.

* Replace OpenFile with Create in crc32 generator. Some minor changes

* Es-split memory and cpu profiler. Es-split discard output. Es-split muxerOut as WriteCloser. Some formatting changes in Es-split. Fix profiler in Probe.

* Fix Close() method for muxerOut.

---------

Co-authored-by: Danil Korymov <danil@24h.tv>

Author: k-danil

cmd/astits-es-split/main.go

@@ -3,8 +3,11 @@ package main
 import (
 	"bufio"
 	"context"
+	"errors"
 	"flag"
 	"fmt"
+	"github.com/pkg/profile"
+	"io"
 	"log"
 	"os"
 	"path"
@@ -19,8 +22,39 @@ const (
 )
 
 type muxerOut struct {
-	f *os.File
-	w *bufio.Writer
+	name   string
+	closer io.Closer
+	*bufio.Writer
+}
+
+func newMuxerOut(name string, discard bool) (*muxerOut, error) {
+	var w io.Writer
+	var c io.Closer
+	if !discard {
+		f, err := os.Create(name)
+		if err != nil {
+			return nil, err
+		}
+		name = f.Name()
+		c = f
+		w = f
+	} else {
+		name += " --discard--"
+		w = io.Discard
+	}
+	return &muxerOut{name, c, bufio.NewWriterSize(w, ioBufSize)}, nil
+}
+
+func (m *muxerOut) Close() error {
+	if err := m.Flush(); err != nil {
+		log.Printf("Error flushing %s: %v", m.name, err)
+	}
+	if m.closer != nil {
+		if err := m.closer.Close(); err != nil {
+			return fmt.Errorf("error closing %s: %w", m.name, err)
+		}
+	}
+	return nil
 }
 
 func main() {
@@ -29,23 +63,34 @@ func main() {
 		fmt.Fprintf(flag.CommandLine.Output(), "%s INPUT_FILE [FLAGS]:\n", os.Args[0])
 		flag.PrintDefaults()
 	}
+
+	memoryProfiling := flag.Bool("mp", false, "if yes, memory profiling is enabled")
+	cpuProfiling := flag.Bool("cp", false, "if yes, cpu profiling is enabled")
+	discard := flag.Bool("discard", false, "if yes, output will be passed to discard (profiling/debug only)")
 	outDir := flag.String("o", "out", "Output dir, 'out' by default")
 	inputFile := astikit.FlagCmd()
 	flag.Parse()
 
+	if *cpuProfiling {
+		defer profile.Start(profile.CPUProfile, profile.ProfilePath(".")).Stop()
+	} else if *memoryProfiling {
+		defer profile.Start(profile.MemProfile, profile.ProfilePath(".")).Stop()
+	}
+
 	infile, err := os.Open(inputFile)
 	if err != nil {
 		log.Fatalf("%v", err)
 	}
 	defer infile.Close()
 
-	_, err = os.Stat(*outDir)
-	if !os.IsNotExist(err) {
-		log.Fatalf("can't write to `%s': already exists", *outDir)
-	}
+	if !*discard {
+		if _, err = os.Stat(*outDir); !os.IsNotExist(err) {
+			log.Fatalf("can't write to '%s': already exists", *outDir)
+		}
 
-	if err = os.MkdirAll(*outDir, os.ModePerm); err != nil {
-		log.Fatalf("%v", err)
+		if err = os.MkdirAll(*outDir, os.ModePerm); err != nil {
+			log.Fatalf("%v", err)
+		}
 	}
 
 	demux := astits.NewDemuxer(
@@ -59,17 +104,16 @@ func main() {
 	gotAllPMTs := false
 	// key is pid
 	muxers := map[uint16]*astits.Muxer{}
-	outfiles := map[uint16]muxerOut{}
 
 	pmtsPrinted := false
 
 	timeStarted := time.Now()
 	bytesWritten := 0
 
+	var d *astits.DemuxerData
 	for {
-		d, err := demux.NextData()
-		if err != nil {
-			if err == astits.ErrNoMorePackets {
+		if d, err = demux.NextData(); err != nil {
+			if errors.Is(err, astits.ErrNoMorePackets) {
 				break
 			}
 			log.Fatalf("%v", err)
@@ -86,8 +130,7 @@ func main() {
 
 			gotAllPMTs = true
 			for _, p := range pat.Programs {
-				_, ok := pmts[p.ProgramNumber]
-				if !ok {
+				if _, ok := pmts[p.ProgramNumber]; !ok {
 					gotAllPMTs = false
 					break
 				}
@@ -105,29 +148,26 @@ func main() {
 					log.Printf("\tProgram %d PCR PID %d", pmt.ProgramNumber, pmt.PCRPID)
 				}
 				for _, es := range pmt.ElementaryStreams {
-					_, ok := muxers[es.ElementaryPID]
-					if ok {
+					if _, ok := muxers[es.ElementaryPID]; ok {
 						continue
 					}
 
 					esFilename := path.Join(*outDir, fmt.Sprintf("%d.ts", es.ElementaryPID))
-					outfile, err := os.Create(esFilename)
-					if err != nil {
+					var outWriter *muxerOut
+					if outWriter, err = newMuxerOut(esFilename, *discard); err != nil {
 						log.Fatalf("%v", err)
 					}
-
-					bufWriter := bufio.NewWriterSize(outfile, ioBufSize)
-					mux := astits.NewMuxer(context.Background(), bufWriter)
-					err = mux.AddElementaryStream(*es)
-					if err != nil {
+					defer func() {
+						if err = outWriter.Close(); err != nil {
+							log.Print(err)
+						}
+					}()
+
+					mux := astits.NewMuxer(context.Background(), outWriter)
+					if err = mux.AddElementaryStream(*es); err != nil {
 						log.Fatalf("%v", err)
 					}
 					mux.SetPCRPID(es.ElementaryPID)
-
-					outfiles[es.ElementaryPID] = muxerOut{
-						f: outfile,
-						w: bufWriter,
-					}
 					muxers[es.ElementaryPID] = mux
 
 					if !pmtsPrinted {
@@ -164,10 +204,11 @@ func main() {
 		}
 
 		var pcr *astits.ClockReference
-		if d.PES.Header.OptionalHeader.PTSDTSIndicator == astits.PTSDTSIndicatorBothPresent {
-			pcr = d.PES.Header.OptionalHeader.DTS
-		} else if d.PES.Header.OptionalHeader.PTSDTSIndicator == astits.PTSDTSIndicatorOnlyPTS {
+		switch d.PES.Header.OptionalHeader.PTSDTSIndicator {
+		case astits.PTSDTSIndicatorOnlyPTS:
 			pcr = d.PES.Header.OptionalHeader.PTS
+		case astits.PTSDTSIndicatorBothPresent:
+			pcr = d.PES.Header.OptionalHeader.DTS
 		}
 
 		if pcr != nil {
@@ -178,29 +219,20 @@ func main() {
 			af.PCR = pcr
 		}
 
-		n, err := mux.WriteData(&astits.MuxerData{
+		var written int
+		if written, err = mux.WriteData(&astits.MuxerData{
 			PID:             pid,
 			AdaptationField: af,
 			PES:             d.PES,
-		})
-		if err != nil {
+		}); err != nil {
 			log.Fatalf("%v", err)
 		}
 
-		bytesWritten += n
+		bytesWritten += written
 	}
 
 	timeDiff := time.Since(timeStarted)
 	log.Printf("%d bytes written at rate %.02f mb/s", bytesWritten, (float64(bytesWritten)/1024.0/1024.0)/timeDiff.Seconds())
 
-	for _, f := range outfiles {
-		if err = f.w.Flush(); err != nil {
-			log.Printf("Error flushing %s: %v", f.f.Name(), err)
-		}
-		if err = f.f.Close(); err != nil {
-			log.Printf("Error closing %s: %v", f.f.Name(), err)
-		}
-	}
-
 	log.Printf("Done")
 }

cmd/astits-probe/main.go

@@ -70,18 +70,24 @@ func main() {
 	case "data":
 		// Fetch data
 		if err = data(dmx); err != nil {
-			log.Fatal(fmt.Errorf("astits: fetching data failed: %w", err))
+			if !errors.Is(err, astits.ErrNoMorePackets) {
+				log.Fatal(fmt.Errorf("astits: fetching data failed: %w", err))
+			}
 		}
 	case "packets":
 		// Fetch packets
 		if err = packets(dmx); err != nil {
-			log.Fatal(fmt.Errorf("astits: fetching packets failed: %w", err))
+			if !errors.Is(err, astits.ErrNoMorePackets) {
+				log.Fatal(fmt.Errorf("astits: fetching packets failed: %w", err))
+			}
 		}
 	default:
 		// Fetch the programs
 		var pgms []*Program
 		if pgms, err = programs(dmx); err != nil {
-			log.Fatal(fmt.Errorf("astits: fetching programs failed: %w", err))
+			if !errors.Is(err, astits.ErrNoMorePackets) {
+				log.Fatal(fmt.Errorf("astits: fetching programs failed: %w", err))
+			}
 		}
 
 		// Print