bump golangci-lint (#784)

.github/workflows/lint.yml

@@ -20,9 +20,9 @@ jobs:
       with:
         go-version: "1.24"
 
-    - uses: golangci/golangci-lint-action@v3
+    - uses: golangci/golangci-lint-action@v8
       with:
-        version: v1.64.5
+        version: v2.1.6
 
   go-mod-tidy:
     runs-on: ubuntu-22.04

.golangci.yml

@@ -1,73 +1,75 @@
+version: "2"
+
 linters:
   enable:
   - asciicheck
   - bidichk
   - bodyclose
-  #- contextcheck
   - copyloopvar
   - dupl
   - errorlint
   - gochecknoinits
   - gocritic
-  - gofmt
-  - gofumpt
   - lll
   - misspell
   - nilerr
   - prealloc
   - predeclared
+  - reassign
   - revive
   - usestdlibvars
   - unconvert
-  #- usetesting
   - tparallel
   - wastedassign
   - whitespace
 
-issues:
-  exclude-use-default: false
+  settings:
+    errcheck:
+      exclude-functions:
+      - io.Copy
+      - (io.Closer).Close
+      - (io.Writer).Write
+      - (hash.Hash).Write
+      - (net.Conn).Close
+      - (net.Conn).SetReadDeadline
+      - (net.Conn).SetWriteDeadline
+      - (*net.TCPConn).SetKeepAlive
+      - (*net.TCPConn).SetKeepAlivePeriod
+      - (*net.TCPConn).SetNoDelay
+      - (net.Listener).Close
+      - (net.PacketConn).Close
+      - (net.PacketConn).SetReadDeadline
+      - (net.PacketConn).SetWriteDeadline
+      - (net/http.ResponseWriter).Write
+      - (*net/http.Server).Serve
+      - (*net/http.Server).ServeTLS
+      - (*net/http.Server).Shutdown
+      - os.Chdir
+      - os.Mkdir
+      - os.MkdirAll
+      - os.Remove
+      - os.RemoveAll
+      - os.Setenv
+      - os.Unsetenv
+      - (*os.File).WriteString
+      - (*os.File).Close
+      - (github.com/datarhei/gosrt.Conn).Close
+      - (github.com/datarhei/gosrt.Conn).SetReadDeadline
+      - (github.com/datarhei/gosrt.Conn).SetWriteDeadline
+      - (*github.com/bluenviron/gortsplib/v4.Client).Close
+      - (*github.com/bluenviron/gortsplib/v4.Server).Close
+      - (*github.com/bluenviron/gortsplib/v4.ServerSession).Close
+      - (*github.com/bluenviron/gortsplib/v4.ServerStream).Close
+      - (*github.com/bluenviron/gortsplib/v4.ServerConn).Close
 
-linters-settings:
-  errcheck:
-    exclude-functions:
-    - io.Copy
-    - (io.Closer).Close
-    - (io.Writer).Write
-    - (hash.Hash).Write
-    - (net.Conn).Close
-    - (net.Conn).SetReadDeadline
-    - (net.Conn).SetWriteDeadline
-    - (*net.TCPConn).SetKeepAlive
-    - (*net.TCPConn).SetKeepAlivePeriod
-    - (*net.TCPConn).SetNoDelay
-    - (net.Listener).Close
-    - (net.PacketConn).Close
-    - (net.PacketConn).SetReadDeadline
-    - (net.PacketConn).SetWriteDeadline
-    - (net/http.ResponseWriter).Write
-    - (*net/http.Server).Serve
-    - (*net/http.Server).ServeTLS
-    - (*net/http.Server).Shutdown
-    - os.Chdir
-    - os.Mkdir
-    - os.MkdirAll
-    - os.Remove
-    - os.RemoveAll
-    - os.Setenv
-    - os.Unsetenv
-    - (*os.File).WriteString
-    - (*os.File).Close
-    - (github.com/datarhei/gosrt.Conn).Close
-    - (github.com/datarhei/gosrt.Conn).SetReadDeadline
-    - (github.com/datarhei/gosrt.Conn).SetWriteDeadline
-    - (*github.com/bluenviron/gortsplib/v4.Client).Close
-    - (*github.com/bluenviron/gortsplib/v4.Server).Close
-    - (*github.com/bluenviron/gortsplib/v4.ServerSession).Close
-    - (*github.com/bluenviron/gortsplib/v4.ServerStream).Close
-    - (*github.com/bluenviron/gortsplib/v4.ServerConn).Close
+    govet:
+      enable-all: true
+      disable:
+      - fieldalignment
+      - reflectvaluecompare
 
-  govet:
-    enable-all: true
-    disable:
-    - fieldalignment
-    - reflectvaluecompare
+formatters:
+  enable:
+  - gofmt
+  - gofumpt
+  - goimports

Makefile

@@ -1,5 +1,5 @@
 BASE_IMAGE = golang:1.24-alpine3.20
-LINT_IMAGE = golangci/golangci-lint:v1.64.5
+LINT_IMAGE = golangci/golangci-lint:v2.1.6
 
 .PHONY: $(shell ls)
 

examples/client-play-backchannel/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-av1-to-jpeg/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-av1/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-g711/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -66,9 +67,9 @@ func main() {
 		}
 
 		// extract G711 samples from RTP packets
-		samples, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		samples, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-h264-mpeg4audio-to-disk/main.go

@@ -1,6 +1,8 @@
+// Package main contains an example.
 package main
 
 import (
+	"errors"
 	"log"
 
 	"github.com/bluenviron/gortsplib/v4"
@@ -91,18 +93,18 @@ func main() {
 		}
 
 		// extract access unit from RTP packets
-		au, err := h264RTPDec.Decode(pkt)
-		if err != nil {
-			if err != rtph264.ErrNonStartingPacketAndNoPrevious && err != rtph264.ErrMorePacketsNeeded {
-				log.Printf("ERR: %v", err)
+		au, err2 := h264RTPDec.Decode(pkt)
+		if err2 != nil {
+			if !errors.Is(err2, rtph264.ErrNonStartingPacketAndNoPrevious) && !errors.Is(err2, rtph264.ErrMorePacketsNeeded) {
+				log.Printf("ERR: %v", err2)
 			}
 			return
 		}
 
 		// encode the access unit into MPEG-TS
-		err = mpegtsMuxer.writeH264(au, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeH264(au, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 
@@ -119,16 +121,16 @@ func main() {
 		}
 
 		// extract access units from RTP packets
-		aus, err := mpeg4AudioRTPDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		aus, err2 := mpeg4AudioRTPDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 
 		// encode access units into MPEG-TS
-		err = mpegtsMuxer.writeMPEG4Audio(aus, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeMPEG4Audio(aus, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-h264-mpeg4audio-to-disk/mpegts_muxer.go

@@ -61,7 +61,7 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 
@@ -70,7 +70,7 @@ func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
 	e.mutex.Lock()
 	defer e.mutex.Unlock()
 
-	var filteredAU [][]byte
+	var filteredAU [][]byte //nolint:prealloc
 
 	nonIDRPresent := false
 	idrPresent := false
@@ -115,7 +115,8 @@ func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
 		if !idrPresent {
 			return nil
 		}
-		e.dtsExtractor = h264.NewDTSExtractor()
+		e.dtsExtractor = &h264.DTSExtractor{}
+		e.dtsExtractor.Initialize()
 	}
 
 	dts, err := e.dtsExtractor.Extract(au, pts)
@@ -132,5 +133,6 @@ func (e *mpegtsMuxer) writeMPEG4Audio(aus [][]byte, pts int64) error {
 	e.mutex.Lock()
 	defer e.mutex.Unlock()
 
-	return e.w.WriteMPEG4Audio(e.mpeg4AudioTrack, multiplyAndDivide(pts, 90000, int64(e.mpeg4AudioFormat.ClockRate())), aus)
+	return e.w.WriteMPEG4Audio(e.mpeg4AudioTrack,
+		multiplyAndDivide(pts, 90000, int64(e.mpeg4AudioFormat.ClockRate())), aus)
 }

examples/client-play-format-h264-to-disk/main.go

@@ -1,6 +1,8 @@
+// Package main contains an example.
 package main
 
 import (
+	"errors"
 	"log"
 
 	"github.com/bluenviron/gortsplib/v4"
@@ -78,18 +80,18 @@ func main() {
 		}
 
 		// extract access unit from RTP packets
-		au, err := rtpDec.Decode(pkt)
-		if err != nil {
-			if err != rtph264.ErrNonStartingPacketAndNoPrevious && err != rtph264.ErrMorePacketsNeeded {
-				log.Printf("ERR: %v", err)
+		au, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			if !errors.Is(err2, rtph264.ErrNonStartingPacketAndNoPrevious) && !errors.Is(err2, rtph264.ErrMorePacketsNeeded) {
+				log.Printf("ERR: %v", err2)
 			}
 			return
 		}
 
 		// encode the access unit into MPEG-TS
-		err = mpegtsMuxer.writeH264(au, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeH264(au, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-h264-to-disk/mpegts_muxer.go

@@ -45,13 +45,13 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 
 // writeH264 writes a H264 access unit into MPEG-TS.
 func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
-	var filteredAU [][]byte
+	var filteredAU [][]byte //nolint:prealloc
 
 	nonIDRPresent := false
 	idrPresent := false
@@ -96,7 +96,8 @@ func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
 		if !idrPresent {
 			return nil
 		}
-		e.dtsExtractor = h264.NewDTSExtractor()
+		e.dtsExtractor = &h264.DTSExtractor{}
+		e.dtsExtractor.Initialize()
 	}
 
 	dts, err := e.dtsExtractor.Extract(au, pts)

examples/client-play-format-h264-to-jpeg/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-h264/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-h265-to-disk/main.go

@@ -1,6 +1,8 @@
+// Package main contains an example.
 package main
 
 import (
+	"errors"
 	"log"
 
 	"github.com/bluenviron/gortsplib/v4"
@@ -79,18 +81,18 @@ func main() {
 		}
 
 		// extract access unit from RTP packets
-		au, err := rtpDec.Decode(pkt)
-		if err != nil {
-			if err != rtph265.ErrNonStartingPacketAndNoPrevious && err != rtph265.ErrMorePacketsNeeded {
-				log.Printf("ERR: %v", err)
+		au, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			if !errors.Is(err2, rtph265.ErrNonStartingPacketAndNoPrevious) && !errors.Is(err2, rtph265.ErrMorePacketsNeeded) {
+				log.Printf("ERR: %v", err2)
 			}
 			return
 		}
 
 		// encode the access unit into MPEG-TS
-		err = mpegtsMuxer.writeH265(au, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeH265(au, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-h265-to-disk/mpegts_muxer.go

@@ -46,13 +46,13 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 
 // writeH265 writes a H265 access unit into MPEG-TS.
 func (e *mpegtsMuxer) writeH265(au [][]byte, pts int64) error {
-	var filteredAU [][]byte
+	var filteredAU [][]byte //nolint:prealloc
 
 	isRandomAccess := false
 
@@ -97,7 +97,8 @@ func (e *mpegtsMuxer) writeH265(au [][]byte, pts int64) error {
 		if !isRandomAccess {
 			return nil
 		}
-		e.dtsExtractor = h265.NewDTSExtractor()
+		e.dtsExtractor = &h265.DTSExtractor{}
+		e.dtsExtractor.Initialize()
 	}
 
 	dts, err := e.dtsExtractor.Extract(au, pts)

examples/client-play-format-h265-to-jpeg/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-h265/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-lpcm/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -65,9 +66,9 @@ func main() {
 		}
 
 		// extract LPCM samples from RTP packets
-		op, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		op, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-mjpeg/main.go

@@ -1,7 +1,9 @@
+// Package main contains an example.
 package main
 
 import (
 	"bytes"
+	"errors"
 	"image/jpeg"
 	"log"
 
@@ -69,18 +71,18 @@ func main() {
 		}
 
 		// extract JPEG images from RTP packets
-		enc, err := rtpDec.Decode(pkt)
-		if err != nil {
-			if err != rtpmjpeg.ErrNonStartingPacketAndNoPrevious && err != rtpmjpeg.ErrMorePacketsNeeded {
-				log.Printf("ERR: %v", err)
+		enc, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			if !errors.Is(err2, rtpmjpeg.ErrNonStartingPacketAndNoPrevious) && !errors.Is(err2, rtpmjpeg.ErrMorePacketsNeeded) {
+				log.Printf("ERR: %v", err2)
 			}
 			return
 		}
 
 		// convert JPEG images into RGBA frames
-		image, err := jpeg.Decode(bytes.NewReader(enc))
-		if err != nil {
-			panic(err)
+		image, err2 := jpeg.Decode(bytes.NewReader(enc))
+		if err2 != nil {
+			panic(err2)
 		}
 
 		log.Printf("decoded image with PTS %v and size %v", pts, image.Bounds().Max)

examples/client-play-format-mpeg4audio-to-disk/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -82,16 +83,16 @@ func main() {
 		}
 
 		// extract access units from RTP packets
-		aus, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		aus, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 
 		// encode access units into MPEG-TS
-		err = mpegtsMuxer.writeMPEG4Audio(aus, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeMPEG4Audio(aus, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-mpeg4audio-to-disk/mpegts_muxer.go

@@ -45,7 +45,7 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 

examples/client-play-format-mpeg4audio/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -65,9 +66,9 @@ func main() {
 		}
 
 		// extract access units from RTP packets
-		aus, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		aus, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-opus-to-disk/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -82,16 +83,16 @@ func main() {
 		}
 
 		// extract Opus packets from RTP packets
-		opkt, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		opkt, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 
 		// encode Opus packets into MPEG-TS
-		err = mpegtsMuxer.writeOpus(opkt, pts)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		err2 = mpegtsMuxer.writeOpus(opkt, pts)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-opus-to-disk/mpegts_muxer.go

@@ -45,7 +45,7 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 

examples/client-play-format-opus/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -65,9 +66,9 @@ func main() {
 		}
 
 		// extract Opus packets from RTP packets
-		op, err := rtpDec.Decode(pkt)
-		if err != nil {
-			log.Printf("ERR: %v", err)
+		op, err2 := rtpDec.Decode(pkt)
+		if err2 != nil {
+			log.Printf("ERR: %v", err2)
 			return
 		}
 

examples/client-play-format-vp8/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-format-vp9/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-play-options/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -53,7 +54,7 @@ func main() {
 	}
 
 	// called when a RTP packet arrives
-	c.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	c.OnPacketRTPAny(func(medi *description.Media, _ format.Format, _ *rtp.Packet) {
 		log.Printf("RTP packet from media %v\n", medi)
 	})
 

examples/client-play-pause/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -47,7 +48,7 @@ func main() {
 	}
 
 	// called when a RTP packet arrives
-	c.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	c.OnPacketRTPAny(func(medi *description.Media, _ format.Format, _ *rtp.Packet) {
 		log.Printf("RTP packet from media %v\n", medi)
 	})
 

examples/client-play-timestamp/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -44,7 +45,7 @@ func main() {
 	}
 
 	// called when a RTP packet arrives
-	c.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	c.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// get the PTS timestamp of the packet, i.e. timestamp relative to the start of the session
 		pts, ptsAvailable := c.PacketPTS2(medi, pkt)
 		log.Printf("PTS: available=%v, value=%v\n", ptsAvailable, pts)

examples/client-play-to-record/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -55,8 +56,8 @@ func main() {
 	defer publisher.Close()
 
 	// read RTP packets from the reader and route them to the publisher
-	reader.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
-		publisher.WritePacketRTP(desc.Medias[0], pkt)
+	reader.OnPacketRTPAny(func(_ *description.Media, _ format.Format, pkt *rtp.Packet) {
+		publisher.WritePacketRTP(desc.Medias[0], pkt) //nolint:errcheck
 	})
 
 	// start playing

examples/client-play/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -44,7 +45,7 @@ func main() {
 	}
 
 	// called when a RTP packet arrives
-	c.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	c.OnPacketRTPAny(func(medi *description.Media, _ format.Format, _ *rtp.Packet) {
 		log.Printf("RTP packet from media %v\n", medi)
 	})
 

examples/client-query/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-av1/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-format-av1/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-g711/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-h264-from-disk/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-h264/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-format-h264/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-h265/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-format-h265/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-lpcm/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-mjpeg/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-mpeg4audio/dummy_audio.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import "math"

examples/client-record-format-mpeg4audio/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-opus/dummy_audio.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import "math"

examples/client-record-format-opus/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-vp8/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-format-vp8/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-format-vp9/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-format-vp9/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-options/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-options/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/client-record-pause/dummy_image.go

@@ -1,3 +1,5 @@
+//go:build cgo
+
 package main
 
 import (

examples/client-record-pause/main.go

@@ -1,5 +1,6 @@
 //go:build cgo
 
+// Package main contains an example.
 package main
 
 import (

examples/proxy-backchannel/client.go

@@ -78,7 +78,7 @@ func (c *client) read() error {
 	}
 
 	writeToClient := func(pkt *rtp.Packet) {
-		rc.WritePacketRTP(backChannelMedia, pkt)
+		rc.WritePacketRTP(backChannelMedia, pkt) //nolint:errcheck
 	}
 
 	// setup all medias
@@ -94,11 +94,11 @@ func (c *client) read() error {
 	log.Printf("stream is ready and can be read from the server at rtsp://localhost:8554/stream\n")
 
 	// called when a RTP packet arrives
-	rc.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	rc.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		log.Printf("received RTP packet from the client, routing to readers")
 
 		// route incoming packets to the server stream
-		stream.WritePacketRTP(medi, pkt)
+		stream.WritePacketRTP(medi, pkt) //nolint:errcheck
 	})
 
 	// start playing

examples/proxy-backchannel/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import "log"

examples/proxy-backchannel/server.go

@@ -32,7 +32,7 @@ func (s *server) initialize() {
 }
 
 // called when a connection is opened.
-func (s *server) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (s *server) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -42,17 +42,17 @@ func (s *server) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx) {
 }
 
 // called when a session is opened.
-func (s *server) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (s *server) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
 // called when a session is closed.
-func (s *server) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+func (s *server) OnSessionClose(_ *gortsplib.ServerHandlerOnSessionCloseCtx) {
 	log.Printf("session closed")
 }
 
 // called when receiving a DESCRIBE request.
-func (s *server) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (s *server) OnDescribe(_ *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	s.mutex.RLock()
@@ -71,7 +71,7 @@ func (s *server) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Re
 }
 
 // called when receiving a SETUP request.
-func (s *server) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (s *server) OnSetup(_ *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("SETUP request")
 
 	s.mutex.RLock()
@@ -93,7 +93,7 @@ func (s *server) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response
 func (s *server) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
-	ctx.Session.OnPacketRTPAny(func(m *description.Media, f format.Format, pkt *rtp.Packet) {
+	ctx.Session.OnPacketRTPAny(func(_ *description.Media, _ format.Format, pkt *rtp.Packet) {
 		log.Printf("received RTP packet from readers, routing to the client")
 
 		s.writeToClient(pkt)

examples/proxy/client.go

@@ -69,9 +69,9 @@ func (c *client) read() error {
 	log.Printf("stream is ready and can be read from the server at rtsp://localhost:8554/stream\n")
 
 	// called when a RTP packet arrives
-	rc.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	rc.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// route incoming packets to the server stream
-		stream.WritePacketRTP(medi, pkt)
+		stream.WritePacketRTP(medi, pkt) //nolint:errcheck
 	})
 
 	// start playing

examples/proxy/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import "log"

examples/proxy/server.go

@@ -29,7 +29,7 @@ func (s *server) initialize() {
 }
 
 // called when a connection is opened.
-func (s *server) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (s *server) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -39,17 +39,17 @@ func (s *server) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx) {
 }
 
 // called when a session is opened.
-func (s *server) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (s *server) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
 // called when a session is closed.
-func (s *server) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+func (s *server) OnSessionClose(_ *gortsplib.ServerHandlerOnSessionCloseCtx) {
 	log.Printf("session closed")
 }
 
 // called when receiving a DESCRIBE request.
-func (s *server) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (s *server) OnDescribe(_ *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	s.mutex.RLock()
@@ -68,7 +68,7 @@ func (s *server) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Re
 }
 
 // called when receiving a SETUP request.
-func (s *server) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (s *server) OnSetup(_ *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("SETUP request")
 
 	s.mutex.RLock()
@@ -87,7 +87,7 @@ func (s *server) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response
 }
 
 // called when receiving a PLAY request.
-func (s *server) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+func (s *server) OnPlay(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
 	return &base.Response{

examples/server-auth/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -36,7 +37,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -46,7 +47,7 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
@@ -66,7 +67,9 @@ func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionClo
 }
 
 // called when receiving a DESCRIBE request.
-func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (
+	*base.Response, *gortsplib.ServerStream, error,
+) {
 	log.Printf("DESCRIBE request")
 
 	// Verify reader credentials.
@@ -133,7 +136,9 @@ func (sh *serverHandler) OnAnnounce(ctx *gortsplib.ServerHandlerOnAnnounceCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (
+	*base.Response, *gortsplib.ServerStream, error,
+) {
 	log.Printf("SETUP request")
 
 	// SETUP is used by both readers and publishers. In case of publishers, just return StatusOK.
@@ -168,7 +173,7 @@ func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.
 }
 
 // called when receiving a PLAY request.
-func (sh *serverHandler) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+func (sh *serverHandler) OnPlay(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
 	return &base.Response{
@@ -181,9 +186,9 @@ func (sh *serverHandler) OnRecord(ctx *gortsplib.ServerHandlerOnRecordCtx) (*bas
 	log.Printf("RECORD request")
 
 	// called when receiving a RTP packet
-	ctx.Session.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	ctx.Session.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// route the RTP packet to all readers
-		sh.stream.WritePacketRTP(medi, pkt)
+		sh.stream.WritePacketRTP(medi, pkt) //nolint:errcheck
 	})
 
 	return &base.Response{

examples/server-play-backchannel/audio_streamer.go

@@ -2,14 +2,12 @@ package main
 
 import (
 	"crypto/rand"
-	"fmt"
 	"log"
 	"time"
 
 	"github.com/bluenviron/gortsplib/v4"
 	"github.com/bluenviron/gortsplib/v4/pkg/format"
 	"github.com/bluenviron/mediacommon/v2/pkg/codecs/g711"
-	"github.com/bluenviron/mediacommon/v2/pkg/formats/mpegts"
 )
 
 func multiplyAndDivide(v, m, d int64) int64 {
@@ -27,15 +25,6 @@ func randUint32() (uint32, error) {
 	return uint32(b[0])<<24 | uint32(b[1])<<16 | uint32(b[2])<<8 | uint32(b[3]), nil
 }
 
-func findTrack(r *mpegts.Reader) (*mpegts.Track, error) {
-	for _, track := range r.Tracks() {
-		if _, ok := track.Codec.(*mpegts.CodecH264); ok {
-			return track, nil
-		}
-	}
-	return nil, fmt.Errorf("H264 track not found")
-}
-
 type audioStreamer struct {
 	stream *gortsplib.ServerStream
 }
@@ -68,7 +57,8 @@ func (r *audioStreamer) run() {
 
 	for range ticker.C {
 		// get current timestamp
-		pts := multiplyAndDivide(int64(time.Since(start)), int64(r.stream.Desc.Medias[0].Formats[0].ClockRate()), int64(time.Second))
+		pts := multiplyAndDivide(int64(time.Since(start)),
+			int64(r.stream.Desc.Medias[0].Formats[0].ClockRate()), int64(time.Second))
 
 		// generate dummy LPCM audio samples
 		samples := createDummyAudio(pts, prevPTS)
@@ -98,6 +88,5 @@ func (r *audioStreamer) run() {
 		}
 
 		prevPTS = pts
-
 	}
 }

examples/server-play-backchannel/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -23,7 +24,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -33,17 +34,19 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
 // called when a session is closed.
-func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+func (sh *serverHandler) OnSessionClose(_ *gortsplib.ServerHandlerOnSessionCloseCtx) {
 	log.Printf("session closed")
 }
 
 // called when receiving a DESCRIBE request.
-func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnDescribe(
+	_ *gortsplib.ServerHandlerOnDescribeCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	sh.mutex.RLock()
@@ -55,7 +58,9 @@ func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(
+	_ *gortsplib.ServerHandlerOnSetupCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("SETUP request")
 
 	sh.mutex.RLock()
@@ -71,7 +76,7 @@ func (sh *serverHandler) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Re
 	log.Printf("PLAY request")
 
 	// called when receiving a RTP packet
-	ctx.Session.OnPacketRTPAny(func(m *description.Media, f format.Format, pkt *rtp.Packet) {
+	ctx.Session.OnPacketRTPAny(func(m *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// decode timestamp
 		pts, ok := ctx.Session.PacketPTS2(m, pkt)
 		if !ok {

examples/server-play-format-h264-from-disk/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -22,7 +23,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -32,17 +33,19 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
 // called when a session is closed.
-func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+func (sh *serverHandler) OnSessionClose(_ *gortsplib.ServerHandlerOnSessionCloseCtx) {
 	log.Printf("session closed")
 }
 
 // called when receiving a DESCRIBE request.
-func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnDescribe(
+	_ *gortsplib.ServerHandlerOnDescribeCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	sh.mutex.RLock()
@@ -54,7 +57,9 @@ func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(
+	_ *gortsplib.ServerHandlerOnSetupCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("SETUP request")
 
 	sh.mutex.RLock()
@@ -66,7 +71,7 @@ func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.
 }
 
 // called when receiving a PLAY request.
-func (sh *serverHandler) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+func (sh *serverHandler) OnPlay(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
 	return &base.Response{

examples/server-record-format-h264-to-disk/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -30,7 +31,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -40,12 +41,12 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
 // called when a session is closed.
-func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+func (sh *serverHandler) OnSessionClose(_ *gortsplib.ServerHandlerOnSessionCloseCtx) {
 	log.Printf("session closed")
 
 	sh.mutex.Lock()
@@ -107,7 +108,9 @@ func (sh *serverHandler) OnAnnounce(ctx *gortsplib.ServerHandlerOnAnnounceCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(
+	ctx *gortsplib.ServerHandlerOnSetupCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	// prevent readers from using the server.
 	if ctx.Session.State() == gortsplib.ServerSessionStateInitial {
 		return &base.Response{
@@ -140,7 +143,7 @@ func (sh *serverHandler) OnRecord(ctx *gortsplib.ServerHandlerOnRecordCtx) (*bas
 		}
 
 		// encode H264 access unit into MPEG-TS
-		sh.mpegtsMuxer.writeH264(au, pts)
+		sh.mpegtsMuxer.writeH264(au, pts) //nolint:errcheck
 	})
 
 	return &base.Response{

examples/server-record-format-h264-to-disk/mpegts_muxer.go

@@ -45,13 +45,13 @@ func (e *mpegtsMuxer) initialize() error {
 
 // close closes all the mpegtsMuxer resources.
 func (e *mpegtsMuxer) close() {
-	e.b.Flush()
+	e.b.Flush() //nolint:errcheck
 	e.f.Close()
 }
 
 // writeH264 writes a H264 access unit into MPEG-TS.
 func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
-	var filteredAU [][]byte
+	var filteredAU [][]byte //nolint:prealloc
 
 	nonIDRPresent := false
 	idrPresent := false
@@ -96,7 +96,8 @@ func (e *mpegtsMuxer) writeH264(au [][]byte, pts int64) error {
 		if !idrPresent {
 			return nil
 		}
-		e.dtsExtractor = h264.NewDTSExtractor()
+		e.dtsExtractor = &h264.DTSExtractor{}
+		e.dtsExtractor.Initialize()
 	}
 
 	dts, err := e.dtsExtractor.Extract(au, pts)

examples/server-tls/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -26,7 +27,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -36,7 +37,7 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
@@ -56,7 +57,9 @@ func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionClo
 }
 
 // called when receiving a DESCRIBE request.
-func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnDescribe(
+	_ *gortsplib.ServerHandlerOnDescribeCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	sh.mutex.RLock()
@@ -105,7 +108,9 @@ func (sh *serverHandler) OnAnnounce(ctx *gortsplib.ServerHandlerOnAnnounceCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(
+	ctx *gortsplib.ServerHandlerOnSetupCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("SETUP request")
 
 	// SETUP is used by both readers and publishers. In case of publishers, just return StatusOK.
@@ -131,7 +136,7 @@ func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.
 }
 
 // called when receiving a PLAY request.
-func (sh *serverHandler) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+func (sh *serverHandler) OnPlay(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
 	return &base.Response{
@@ -144,9 +149,9 @@ func (sh *serverHandler) OnRecord(ctx *gortsplib.ServerHandlerOnRecordCtx) (*bas
 	log.Printf("RECORD request")
 
 	// called when receiving a RTP packet
-	ctx.Session.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	ctx.Session.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// route the RTP packet to all readers
-		sh.stream.WritePacketRTP(medi, pkt)
+		sh.stream.WritePacketRTP(medi, pkt) //nolint:errcheck
 	})
 
 	return &base.Response{

examples/server/main.go

@@ -1,3 +1,4 @@
+// Package main contains an example.
 package main
 
 import (
@@ -25,7 +26,7 @@ type serverHandler struct {
 }
 
 // called when a connection is opened.
-func (sh *serverHandler) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+func (sh *serverHandler) OnConnOpen(_ *gortsplib.ServerHandlerOnConnOpenCtx) {
 	log.Printf("conn opened")
 }
 
@@ -35,7 +36,7 @@ func (sh *serverHandler) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx)
 }
 
 // called when a session is opened.
-func (sh *serverHandler) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+func (sh *serverHandler) OnSessionOpen(_ *gortsplib.ServerHandlerOnSessionOpenCtx) {
 	log.Printf("session opened")
 }
 
@@ -55,7 +56,9 @@ func (sh *serverHandler) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionClo
 }
 
 // called when receiving a DESCRIBE request.
-func (sh *serverHandler) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnDescribe(
+	_ *gortsplib.ServerHandlerOnDescribeCtx,
+) (*base.Response, *gortsplib.ServerStream, error) {
 	log.Printf("DESCRIBE request")
 
 	sh.mutex.RLock()
@@ -104,7 +107,9 @@ func (sh *serverHandler) OnAnnounce(ctx *gortsplib.ServerHandlerOnAnnounceCtx) (
 }
 
 // called when receiving a SETUP request.
-func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (
+	*base.Response, *gortsplib.ServerStream, error,
+) {
 	log.Printf("SETUP request")
 
 	// SETUP is used by both readers and publishers. In case of publishers, just return StatusOK.
@@ -130,7 +135,7 @@ func (sh *serverHandler) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.
 }
 
 // called when receiving a PLAY request.
-func (sh *serverHandler) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+func (sh *serverHandler) OnPlay(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
 	log.Printf("PLAY request")
 
 	return &base.Response{
@@ -143,9 +148,9 @@ func (sh *serverHandler) OnRecord(ctx *gortsplib.ServerHandlerOnRecordCtx) (*bas
 	log.Printf("RECORD request")
 
 	// called when receiving a RTP packet
-	ctx.Session.OnPacketRTPAny(func(medi *description.Media, forma format.Format, pkt *rtp.Packet) {
+	ctx.Session.OnPacketRTPAny(func(medi *description.Media, _ format.Format, pkt *rtp.Packet) {
 		// route the RTP packet to all readers
-		sh.stream.WritePacketRTP(medi, pkt)
+		sh.stream.WritePacketRTP(medi, pkt) //nolint:errcheck
 	})
 
 	return &base.Response{

pkg/format/rtpmjpeg/encoder.go

@@ -81,11 +81,7 @@ func (e *Encoder) Encode(image []byte) ([]*rtp.Packet, error) {
 	var data []byte
 
 outer:
-	for {
-		if len(image) < 2 {
-			break
-		}
-
+	for len(image) >= 2 {
 		h0, h1 := image[0], image[1]
 		image = image[2:]
 

pkg/format/rtpmpeg1video/decoder.go

@@ -72,13 +72,13 @@ func (d *Decoder) decodeSlice(pkt *rtp.Packet) ([]byte, error) {
 	an := pkt.Payload[2] >> 7
 	if an != 0 {
 		d.resetFragments()
-		return nil, fmt.Errorf("AN not supported yet")
+		return nil, fmt.Errorf("'AN' not supported yet")
 	}
 
 	n := (pkt.Payload[2] >> 6) & 0x01
 	if n != 0 {
 		d.resetFragments()
-		return nil, fmt.Errorf("N not supported yet")
+		return nil, fmt.Errorf("'N' not supported yet")
 	}
 
 	b := (pkt.Payload[2] >> 4) & 0x01

pkg/headers/keyval.go

@@ -6,11 +6,7 @@ import (
 
 func readKey(str string, separator byte) (string, string) {
 	i := 0
-	for {
-		if i >= len(str) || str[i] == '=' || str[i] == separator {
-			break
-		}
-
+	for i < len(str) && str[i] != '=' && str[i] != separator {
 		i++
 	}
 	return str[:i], str[i:]