add internal demo

internal/web/demo/demo.css

@@ -0,0 +1,8 @@
+/*
+    SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+    SPDX-License-Identifier: MIT
+*/
+textarea {
+    width: 500px;
+    min-height: 75px;
+}

internal/web/demo/demo.js

@@ -0,0 +1,67 @@
+/* eslint-env browser */
+
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+const pc = new RTCPeerConnection({
+    iceServers: [{
+      urls: 'stun:stun.l.google.com:19302'
+    }]
+  })
+  const log = msg => {
+    document.getElementById('div').innerHTML += msg + '<br>'
+  }
+  
+  pc.ontrack = function (event) {
+    const el = document.createElement(event.track.kind)
+    el.srcObject = event.streams[0]
+    el.autoplay = true
+    el.controls = true
+  
+    document.getElementById('remoteVideos').appendChild(el)
+  }
+  
+  pc.oniceconnectionstatechange = e => log(pc.iceConnectionState)
+  pc.onicecandidate = event => {
+    if (event.candidate === null) {
+      document.getElementById('localSessionDescription').value = btoa(JSON.stringify(pc.localDescription))
+    }
+  }
+  
+  // Offer to receive 1 audio, and 1 video track
+  pc.addTransceiver('video', {
+    direction: 'sendrecv'
+  })
+  pc.addTransceiver('audio', {
+    direction: 'sendrecv'
+  })
+  
+  pc.createOffer().then(d => pc.setLocalDescription(d)).catch(log)
+  
+  window.startSession = () => {
+    const sd = document.getElementById('remoteSessionDescription').value
+    if (sd === '') {
+      return alert('Session Description must not be empty')
+    }
+  
+    try {
+      pc.setRemoteDescription(JSON.parse(atob(sd)))
+    } catch (e) {
+      alert(e)
+    }
+  }
+  
+  window.copySessionDescription = () => {
+    const browserSessionDescription = document.getElementById('localSessionDescription')
+  
+    browserSessionDescription.focus()
+    browserSessionDescription.select()
+  
+    try {
+      const successful = document.execCommand('copy')
+      const msg = successful ? 'successful' : 'unsuccessful'
+      log('Copying SessionDescription was ' + msg)
+    } catch (err) {
+      log('Oops, unable to copy SessionDescription ' + err)
+    }
+  }

internal/web/demo/index.html

@@ -0,0 +1,30 @@
+<!--
+	SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+	SPDX-License-Identifier: MIT
+-->
+Browser Session Description
+<br/>
+<textarea id="localSessionDescription" readonly="true"></textarea>
+<br/>
+
+<button onclick="window.copySessionDescription()">Copy browser Session Description to clipboard</button>
+
+<br/>
+<br/>
+<br/>
+
+Remote Session Description
+<br/>
+<textarea id="remoteSessionDescription"></textarea>
+<br/>
+<button onclick="window.startSession()">Start Session</button>
+<br/>
+<br/>
+
+Video
+<br/>
+<div id="remoteVideos"></div> <br />
+
+Logs
+<br/>
+<div id="div"></div>

internal/web/demo/readme.txt

@@ -0,0 +1 @@
+Initially copied from https://github.com/pion/webrtc/tree/master/examples/play-from-disk/jsfiddle

internal/web/handlers/signaling.go

@@ -35,21 +35,31 @@ func NewSignalingHandler(
 
 func (h *SignalingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
+		h.l.Sugar().Errorw("unexpected method")
 		SetError(w, entities.ErrHTTPPostOnly)
 		return
 	}
 
 	params := entities.RequestParams{}
 	if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
+		h.l.Sugar().Errorw("error while decoding request params json",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 	if err := params.Valid(); err != nil {
+		h.l.Sugar().Errorw("invalid params",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 
 	if err := h.webRTCController.SetupPeerConnection(); err != nil {
+		h.l.Sugar().Errorw("error while setting up web rtc connection",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
@@ -62,34 +72,52 @@ func (h *SignalingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}, "video", params.SRTStreamID,
 	)
 	if err != nil {
+		h.l.Sugar().Errorw("error while creating a web rtc track",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 
 	metadataSender, err := h.webRTCController.CreateDataChannel(entities.MetadataChannelID)
 	if err != nil {
+		h.l.Sugar().Errorw("error while createing a web rtc data channel",
+			"error", err,
+		)
 		SetError(w, err)
 	}
 
 	if err = h.webRTCController.SetRemoteDescription(params.Offer); err != nil {
+		h.l.Sugar().Errorw("error while setting a remote web rtc description",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 
 	localDescription, err := h.webRTCController.GatheringWebRTC()
 	if err != nil {
+		h.l.Sugar().Errorw("error while preparing a local web rtc description",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 
 	localOfferDescription, err := json.Marshal(*localDescription)
 	if err != nil {
+		h.l.Sugar().Errorw("error while encoding a local web rtc description",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
 
 	srtConnection, err := h.srtController.Connect(&params)
 	if err != nil {
+		h.l.Sugar().Errorw("error while connecting to an srt server",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}
@@ -97,6 +125,9 @@ func (h *SignalingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	go h.streamingController.Stream(srtConnection, videoTrack, metadataSender)
 
 	if _, err := w.Write(localOfferDescription); err != nil {
+		h.l.Sugar().Errorw("error responding the local web rtc offer description",
+			"error", err,
+		)
 		SetError(w, err)
 		return
 	}

internal/web/router.go

@@ -15,6 +15,7 @@ func NewServeMux(
 
 	mux.Handle("/", index)
 	mux.Handle("/doSignaling", setCors(signaling))
+	mux.Handle("/demo", http.FileServer(http.Dir("./demo")))
 
 	return mux
 }

scripts/ffmpeg_srt_live_listener.sh

@@ -3,5 +3,5 @@ ffmpeg -hide_banner -loglevel verbose \
     -f lavfi -i "sine=frequency=1000:sample_rate=44100" \
     -c:v libx264 -preset veryfast -tune zerolatency -profile:v baseline \
     -b:v 1000k -bufsize 2000k -x264opts keyint=30:min-keyint=30:scenecut=-1 \
-    -f mpegts "srt://${SRT_LISTENING_HOST}:${SRT_LISTENING_PORT}?mode=listener&latency=${SRT_LISTENING_LATENCY_US}"
+    -f mpegts "srt://${SRT_LISTENING_HOST}:${SRT_LISTENING_PORT}?mode=listener&latency=${SRT_LISTENING_LATENCY_US}&smoother=live&transtype=live"