Rewrite stream info API

pkg/streamer/helpers.go

@@ -4,13 +4,16 @@ import (
 	"strings"
 )
 
-const (
-	JSONType       = "type"
-	JSONRemoteAddr = "remote_addr"
-	JSONUserAgent  = "user_agent"
-	JSONReceive    = "receive"
-	JSONSend       = "send"
-)
+type Info struct {
+	Type       string   `json:"type,omitempty"`
+	URL        string   `json:"url,omitempty"`
+	RemoteAddr string   `json:"remote_addr,omitempty"`
+	UserAgent  string   `json:"user_agent,omitempty"`
+	Medias     []*Media `json:"medias,omitempty"`
+	Tracks     []*Track `json:"tracks,omitempty"`
+	Recv       uint32   `json:"recv,omitempty"`
+	Send       uint32   `json:"send,omitempty"`
+}
 
 func Between(s, sub1, sub2 string) string {
 	i := strings.Index(s, sub1)

pkg/streamer/media.go

@@ -1,6 +1,7 @@
 package streamer
 
 import (
+	"encoding/json"
 	"fmt"
 	"github.com/pion/sdp/v3"
 	"strconv"
@@ -70,6 +71,10 @@ func (m *Media) String() string {
 	return s
 }
 
+func (m *Media) MarshalJSON() ([]byte, error) {
+	return json.Marshal(m.String())
+}
+
 func (m *Media) Clone() *Media {
 	clone := *m
 	return &clone

pkg/streamer/track.go

@@ -1,6 +1,7 @@
 package streamer
 
 import (
+	"encoding/json"
 	"fmt"
 	"github.com/pion/rtp"
 	"sync"
@@ -22,12 +23,19 @@ func NewTrack(codec *Codec, direction string) *Track {
 
 func (t *Track) String() string {
 	s := t.Codec.String()
-	t.sinkMu.RLock()
-	s += fmt.Sprintf(", sinks=%d", len(t.sink))
-	t.sinkMu.RUnlock()
+	if t.sinkMu.TryRLock() {
+		s += fmt.Sprintf(", sinks=%d", len(t.sink))
+		t.sinkMu.RUnlock()
+	} else {
+		s += fmt.Sprintf(", sinks=?")
+	}
 	return s
 }
 
+func (t *Track) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.String())
+}
+
 func (t *Track) WriteRTP(p *rtp.Packet) error {
 	t.sinkMu.RLock()
 	for _, f := range t.sink {