Add HLS client

internal/http/http.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/AlexxIT/go2rtc/internal/streams"
 	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/hls"
 	"github.com/AlexxIT/go2rtc/pkg/magic"
 	"github.com/AlexxIT/go2rtc/pkg/mjpeg"
 	"github.com/AlexxIT/go2rtc/pkg/multipart"
@@ -39,27 +40,29 @@ func handleHTTP(url string) (core.Producer, error) {
 		return nil, errors.New(res.Status)
 	}
 
+	// 1. Guess format from content type
 	ct := res.Header.Get("Content-Type")
 	if i := strings.IndexByte(ct, ';'); i > 0 {
 		ct = ct[:i]
 	}
 
-	switch ct {
+	var ext string
-	case "image/jpeg":
+	if i := strings.LastIndexByte(req.URL.Path, '.'); i > 0 {
+		ext = req.URL.Path[i+1:]
+	}
+
+	switch {
+	case ct == "image/jpeg":
 		return mjpeg.NewClient(res), nil
 
-	case "multipart/x-mixed-replace":
+	case ct == "multipart/x-mixed-replace":
 		return multipart.NewClient(res)
 
-	default: // "video/mpeg":
+	case ct == "application/vnd.apple.mpegurl" || ext == "m3u8":
+		return hls.OpenURL(req.URL, res.Body)
 	}
 
-	client, err := magic.Open(res.Body)
+	return magic.Open(res.Body)
-	if err != nil {
-		return nil, err
-	}
-
-	return client, nil
 }
 
 func handleTCP(rawURL string) (core.Producer, error) {

pkg/hls/producer.go

@@ -0,0 +1,17 @@
+package hls
+
+import (
+	"io"
+	"net/url"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/mpegts"
+)
+
+func OpenURL(u *url.URL, body io.ReadCloser) (core.Producer, error) {
+	rd, err := NewReader(u, body)
+	if err != nil {
+		return nil, err
+	}
+	return mpegts.Open(rd)
+}

pkg/hls/reader.go

@@ -0,0 +1,146 @@
+package hls
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"time"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+)
+
+type reader struct {
+	client  *http.Client
+	request *http.Request
+
+	lastSegment []byte
+	lastTime    time.Time
+
+	buf []byte
+}
+
+func NewReader(u *url.URL, body io.ReadCloser) (io.Reader, error) {
+	b, err := io.ReadAll(body)
+	if err != nil {
+		return nil, err
+	}
+
+	re := regexp.MustCompile(`#EXT-X-STREAM-INF.+?\n(\S+)`)
+	m := re.FindSubmatch(b)
+	if m == nil {
+		return nil, errors.New("hls: wrong playlist: " + string(b))
+	}
+
+	ref, err := url.Parse(string(m[1]))
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest("GET", u.ResolveReference(ref).String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	rd := &reader{
+		client:  &http.Client{Timeout: core.ConnDialTimeout},
+		request: req,
+	}
+	return rd, nil
+}
+
+func (r *reader) Read(dst []byte) (n int, err error) {
+	// 1. Check temporary tempbuffer
+	if len(r.buf) == 0 {
+		src, err2 := r.getSegment()
+		if err2 != nil {
+			return 0, err2
+		}
+
+		// 2. Check if the message fits in the buffer
+		if len(src) <= len(dst) {
+			return copy(dst, src), nil
+		}
+
+		// 3. Put the message into a temporary buffer
+		r.buf = src
+	}
+
+	// 4. Send temporary buffer
+	n = copy(dst, r.buf)
+	r.buf = r.buf[n:]
+	return
+}
+
+func (r *reader) getSegment() ([]byte, error) {
+	for {
+		if wait := time.Second - time.Since(r.lastTime); wait > 0 {
+			time.Sleep(wait)
+		}
+
+		// 1. Load playlist
+		res, err := r.client.Do(r.request)
+		if err != nil {
+			return nil, err
+		}
+
+		playlist, err := io.ReadAll(res.Body)
+		if err != nil {
+			return nil, err
+		}
+
+		r.lastTime = time.Now()
+
+		//log.Printf("[hls] load playlist\n%s", playlist)
+
+		// 2. Remove all previous segments from playlist
+		if i := bytes.Index(playlist, r.lastSegment); i > 0 {
+			playlist = playlist[i:]
+		}
+
+		for playlist != nil {
+			// 3. Get link to new segment
+			var segment []byte
+			if segment, playlist = getSegment(playlist); segment == nil {
+				break
+			}
+
+			//log.Printf("[hls] load segment: %s", segment)
+
+			ref, err2 := url.Parse(string(segment))
+			if err2 != nil {
+				return nil, err2
+			}
+
+			ref = r.request.URL.ResolveReference(ref)
+			if res, err2 = r.client.Get(ref.String()); err2 != nil {
+				return nil, err2
+			}
+
+			r.lastSegment = segment
+
+			return io.ReadAll(res.Body)
+		}
+	}
+}
+
+func getSegment(src []byte) (segment, left []byte) {
+	for ok := false; !ok; {
+		ok = bytes.HasPrefix(src, []byte("#EXTINF"))
+
+		i := bytes.IndexByte(src, '\n') + 1
+		if i == 0 {
+			return nil, nil
+		}
+
+		src = src[i:]
+	}
+
+	if i := bytes.IndexByte(src, '\n'); i > 0 {
+		return src[:i], src[i+1:]
+	}
+
+	return src, nil
+}