rename 'read' into 'play', 'publish' into 'record' (#463)

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

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"log"
+
+	"github.com/bluenviron/gortsplib/v4"
+	"github.com/bluenviron/gortsplib/v4/pkg/base"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
+	"github.com/pion/rtp"
+)
+
+// This example shows how to
+// 1. connect to a RTSP server
+// 2. check if there's an MPEG-4 audio media
+// 3. save the content of the media into a file in MPEG-TS format
+
+func main() {
+	c := gortsplib.Client{}
+
+	// parse URL
+	u, err := base.ParseURL("rtsp://localhost:8554/mystream")
+	if err != nil {
+		panic(err)
+	}
+
+	// connect to the server
+	err = c.Start(u.Scheme, u.Host)
+	if err != nil {
+		panic(err)
+	}
+	defer c.Close()
+
+	// find available medias
+	desc, _, err := c.Describe(u)
+	if err != nil {
+		panic(err)
+	}
+
+	// find the MPEG-4 audio media and format
+	var forma *format.MPEG4Audio
+	medi := desc.FindFormat(&forma)
+	if medi == nil {
+		panic("media not found")
+	}
+
+	// setup RTP/MPEG-4 audio -> MPEG-4 audio decoder
+	rtpDec, err := forma.CreateDecoder()
+	if err != nil {
+		panic(err)
+	}
+
+	// setup MPEG-4 audio -> MPEG-TS muxer
+	mpegtsMuxer, err := newMPEGTSMuxer(forma.Config)
+	if err != nil {
+		panic(err)
+	}
+
+	// setup a single media
+	_, err = c.Setup(desc.BaseURL, medi, 0, 0)
+	if err != nil {
+		panic(err)
+	}
+
+	// called when a RTP packet arrives
+	c.OnPacketRTP(medi, forma, func(pkt *rtp.Packet) {
+		// decode timestamp
+		pts, ok := c.PacketPTS(medi, pkt)
+		if !ok {
+			log.Printf("waiting for timestamp")
+			return
+		}
+
+		// extract access units from RTP packets
+		aus, err := rtpDec.Decode(pkt)
+		if err != nil {
+			log.Printf("ERR: %v", err)
+			return
+		}
+
+		// encode access units into MPEG-TS
+		err = mpegtsMuxer.encode(aus, pts)
+		if err != nil {
+			log.Printf("ERR: %v", err)
+			return
+		}
+
+		log.Printf("saved TS packet")
+	})
+
+	// start playing
+	_, err = c.Play(nil)
+	if err != nil {
+		panic(err)
+	}
+
+	// wait until a fatal error
+	panic(c.Wait())
+}

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

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"time"
+
+	"github.com/bluenviron/mediacommon/pkg/codecs/mpeg4audio"
+	"github.com/bluenviron/mediacommon/pkg/formats/mpegts"
+)
+
+func durationGoToMPEGTS(v time.Duration) int64 {
+	return int64(v.Seconds() * 90000)
+}
+
+// mpegtsMuxer allows to save a MPEG4-audio stream into a MPEG-TS file.
+type mpegtsMuxer struct {
+	config *mpeg4audio.Config
+	f      *os.File
+	b      *bufio.Writer
+	w      *mpegts.Writer
+	track  *mpegts.Track
+}
+
+// newMPEGTSMuxer allocates a mpegtsMuxer.
+func newMPEGTSMuxer(config *mpeg4audio.Config) (*mpegtsMuxer, error) {
+	f, err := os.Create("mystream.ts")
+	if err != nil {
+		return nil, err
+	}
+	b := bufio.NewWriter(f)
+
+	track := &mpegts.Track{
+		Codec: &mpegts.CodecMPEG4Audio{
+			Config: *config,
+		},
+	}
+
+	w := mpegts.NewWriter(b, []*mpegts.Track{track})
+
+	return &mpegtsMuxer{
+		config: config,
+		f:      f,
+		b:      b,
+		w:      w,
+		track:  track,
+	}, nil
+}
+
+// close closes all the mpegtsMuxer resources.
+func (e *mpegtsMuxer) close() {
+	e.b.Flush()
+	e.f.Close()
+}
+
+// encode encodes MPEG-4 audio access units into MPEG-TS.
+func (e *mpegtsMuxer) encode(aus [][]byte, pts time.Duration) error {
+	return e.w.WriteMPEG4Audio(e.track, durationGoToMPEGTS(pts), aus)
+}