hls: add EXT-X-PROGRAM-DATE-TIME tag

internal/hls/muxer_stream_playlist.go

@@ -72,8 +72,8 @@ func (p *muxerStreamPlaylist) reader() io.Reader {
 			ret := uint(0)
 
 			// EXTINF, when rounded to the nearest integer, must be <= EXT-X-TARGETDURATION
-			for _, f := range p.segments {
+			for _, s := range p.segments {
-				v2 := uint(math.Round(f.duration().Seconds()))
+				v2 := uint(math.Round(s.duration().Seconds()))
 				if v2 > ret {
 					ret = v2
 				}
@@ -84,10 +84,12 @@ func (p *muxerStreamPlaylist) reader() io.Reader {
 		cnt += "#EXT-X-TARGETDURATION:" + strconv.FormatUint(uint64(targetDuration), 10) + "\n"
 
 		cnt += "#EXT-X-MEDIA-SEQUENCE:" + strconv.FormatInt(int64(p.segmentDeleteCount), 10) + "\n"
+		cnt += "\n"
 
-		for _, f := range p.segments {
+		for _, s := range p.segments {
-			cnt += "#EXTINF:" + strconv.FormatFloat(f.duration().Seconds(), 'f', -1, 64) + ",\n"
+			cnt += "#EXT-X-PROGRAM-DATE-TIME:" + s.startTime.Format("2006-01-02T15:04:05+07:00") + "\n" +
-			cnt += f.name + ".ts\n"
+				"#EXTINF:" + strconv.FormatFloat(s.duration().Seconds(), 'f', -1, 64) + ",\n" +
+				s.name + ".ts\n"
 		}
 
 		return []byte(cnt)

internal/hls/muxer_test.go

@@ -80,12 +80,14 @@ func TestMuxerVideoAudio(t *testing.T) {
 		`#EXT-X-ALLOW-CACHE:NO\n` +
 		`#EXT-X-TARGETDURATION:4\n` +
 		`#EXT-X-MEDIA-SEQUENCE:0\n` +
+		`\n` +
+		`#EXT-X-PROGRAM-DATE-TIME:(.*?)\n` +
 		`#EXTINF:4,\n` +
 		`([0-9]+\.ts)\n$`)
 	ma := re.FindStringSubmatch(string(byts))
 	require.NotEqual(t, 0, len(ma))
 
-	byts, err = ioutil.ReadAll(m.Segment(ma[1]))
+	byts, err = ioutil.ReadAll(m.Segment(ma[2]))
 	require.NoError(t, err)
 
 	// PMT
@@ -168,6 +170,8 @@ func TestMuxerAudio(t *testing.T) {
 		`#EXT-X-ALLOW-CACHE:NO\n` +
 		`#EXT-X-TARGETDURATION:1\n` +
 		`#EXT-X-MEDIA-SEQUENCE:0\n` +
+		`\n` +
+		`#EXT-X-PROGRAM-DATE-TIME:(.*?)\n` +
 		`#EXTINF:1,\n` +
 		`([0-9]+\.ts)\n$`)
 	ma := re.FindStringSubmatch(string(byts))

internal/hls/muxer_ts_segment.go

@@ -16,6 +16,7 @@ type muxerTSSegment struct {
 	videoTrack        *gortsplib.TrackH264
 	writer            *muxerTSWriter
 
+	startTime      time.Time
 	name           string
 	buf            bytes.Buffer
 	startPTS       *time.Duration
@@ -29,11 +30,14 @@ func newMuxerTSSegment(
 	videoTrack *gortsplib.TrackH264,
 	writer *muxerTSWriter,
 ) *muxerTSSegment {
+	now := time.Now()
+
 	t := &muxerTSSegment{
 		hlsSegmentMaxSize: hlsSegmentMaxSize,
 		videoTrack:        videoTrack,
 		writer:            writer,
-		name:              strconv.FormatInt(time.Now().Unix(), 10),
+		startTime:         now,
+		name:              strconv.FormatInt(now.Unix(), 10),
 	}
 
 	// WriteTable() is called automatically when WriteData() is called with