Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 1 | 'use strict'; |
| 2 | |
| 3 | const receiveButton = document.getElementById('receiveButton'); |
| 4 | receiveButton.addEventListener('click', onReceive); |
Jorge E. Moreira | cfd0840 | 2020-01-13 18:36:33 -0800 | [diff] [blame] | 5 | const keyboardCaptureButton = document.getElementById('keyboardCaptureBtn'); |
| 6 | keyboardCaptureButton.addEventListener('click', onKeyboardCaptureClick); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 7 | |
| 8 | const videoElement = document.getElementById('video'); |
| 9 | |
| 10 | videoElement.addEventListener("click", onInitialClick); |
| 11 | |
| 12 | function onInitialClick(e) { |
| 13 | // This stupid thing makes sure that we disable controls after the first click... |
| 14 | // Why not just disable controls altogether you ask? Because then audio won't play |
| 15 | // because these days user-interaction is required to enable audio playback... |
| 16 | console.log("onInitialClick"); |
| 17 | |
| 18 | videoElement.controls = false; |
| 19 | videoElement.removeEventListener("click", onInitialClick); |
| 20 | } |
| 21 | |
| 22 | let pc1; |
| 23 | let pc2; |
| 24 | |
| 25 | let dataChannel; |
| 26 | |
| 27 | let ws; |
| 28 | |
| 29 | let offerResolve; |
| 30 | let iceCandidateResolve; |
| 31 | |
| 32 | let videoStream; |
| 33 | |
| 34 | let mouseIsDown = false; |
| 35 | |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 36 | const is_chrome = navigator.userAgent.indexOf("Chrome") !== -1; |
| 37 | |
| 38 | function handleDataChannelStatusChange(event) { |
| 39 | console.log('handleDataChannelStatusChange state=' + dataChannel.readyState); |
| 40 | |
| 41 | if (dataChannel.readyState == "open") { |
| 42 | dataChannel.send("Hello, world!"); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | function handleDataChannelMessage(event) { |
| 47 | console.log('handleDataChannelMessage data="' + event.data + '"'); |
| 48 | } |
| 49 | |
Jorge E. Moreira | cfd0840 | 2020-01-13 18:36:33 -0800 | [diff] [blame] | 50 | function onKeyboardCaptureClick(e) { |
| 51 | const selectedClass = 'selected'; |
| 52 | if (keyboardCaptureButton.classList.contains(selectedClass)) { |
| 53 | stopKeyboardTracking(); |
| 54 | keyboardCaptureButton.classList.remove(selectedClass); |
| 55 | } else { |
| 56 | startKeyboardTracking(); |
| 57 | keyboardCaptureButton.classList.add(selectedClass); |
| 58 | } |
| 59 | } |
| 60 | |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 61 | async function onReceive() { |
| 62 | console.log('onReceive'); |
| 63 | receiveButton.disabled = true; |
| 64 | |
| 65 | init_logcat(); |
| 66 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 67 | const wsProtocol = (location.protocol == "http:") ? "ws:" : "wss:"; |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 68 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 69 | ws = new WebSocket(wsProtocol + "//" + location.host + "/control"); |
Jorge E. Moreira | b04746d | 2020-01-22 14:25:59 -0800 | [diff] [blame] | 70 | // temporarily disable audio to free ports in the server since it's only |
| 71 | // producing silence anyways. |
| 72 | var search = location.search + "&disable_audio=1"; |
| 73 | search = '?' + search.substr(1); |
| 74 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 75 | ws.onopen = function() { |
| 76 | console.log("onopen"); |
| 77 | ws.send('{\r\n' |
| 78 | + '"type": "greeting",\r\n' |
| 79 | + '"message": "Hello, world!",\r\n' |
Jorge E. Moreira | b04746d | 2020-01-22 14:25:59 -0800 | [diff] [blame] | 80 | + '"path": "' + location.pathname + search + '"\r\n' |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 81 | + '}'); |
| 82 | }; |
| 83 | ws.onmessage = function(e) { |
| 84 | console.log("onmessage " + e.data); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 85 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 86 | let data = JSON.parse(e.data); |
| 87 | if (data.type == "hello") { |
| 88 | kickoff(); |
| 89 | } else if (data.type == "offer" && offerResolve) { |
| 90 | offerResolve(data.sdp); |
| 91 | offerResolve = undefined; |
| 92 | } else if (data.type == "ice-candidate" && iceCandidateResolve) { |
| 93 | iceCandidateResolve(data); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 94 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 95 | iceCandidateResolve = undefined; |
| 96 | } |
| 97 | }; |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 98 | |
| 99 | pc2 = new RTCPeerConnection(); |
| 100 | console.log('got pc2=' + pc2); |
| 101 | |
| 102 | pc2.addEventListener( |
| 103 | 'icecandidate', e => onIceCandidate(pc2, e)); |
| 104 | |
| 105 | pc2.addEventListener( |
| 106 | 'iceconnectionstatechange', e => onIceStateChange(pc2, e)); |
| 107 | |
| 108 | pc2.addEventListener( |
| 109 | 'connectionstatechange', e => { |
| 110 | console.log("connection state = " + pc2.connectionState); |
| 111 | }); |
| 112 | |
| 113 | pc2.addEventListener('track', onGotRemoteStream); |
| 114 | |
| 115 | dataChannel = pc2.createDataChannel("data-channel"); |
| 116 | dataChannel.onopen = handleDataChannelStatusChange; |
| 117 | dataChannel.onclose = handleDataChannelStatusChange; |
| 118 | dataChannel.onmessage = handleDataChannelMessage; |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | async function kickoff() { |
| 122 | console.log('createOffer start'); |
| 123 | |
| 124 | try { |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 125 | var offer = await getWsOffer(); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 126 | await onCreateOfferSuccess(offer); |
| 127 | } catch (e) { |
| 128 | console.log('createOffer FAILED '); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | async function onCreateOfferSuccess(desc) { |
| 133 | console.log(`Offer ${desc.sdp}`); |
| 134 | |
| 135 | try { |
| 136 | pc2.setRemoteDescription(desc); |
| 137 | } catch (e) { |
| 138 | console.log('setRemoteDescription pc2 FAILED'); |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | console.log('setRemoteDescription pc2 successful.'); |
| 143 | |
| 144 | try { |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 145 | setWsLocalDescription(desc); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 146 | } catch (e) { |
| 147 | console.log('setLocalDescription pc1 FAILED'); |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | console.log('setLocalDescription pc1 successful.'); |
| 152 | |
| 153 | try { |
| 154 | const answer = await pc2.createAnswer(); |
| 155 | |
| 156 | await onCreateAnswerSuccess(answer); |
| 157 | } catch (e) { |
| 158 | console.log('createAnswer FAILED'); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | function setWsRemoteDescription(desc) { |
| 163 | ws.send('{\r\n' |
| 164 | + '"type": "set-remote-desc",\r\n' |
| 165 | + '"sdp": "' + desc.sdp + '"\r\n' |
| 166 | + '}'); |
| 167 | } |
| 168 | |
| 169 | function setWsLocalDescription(desc) { |
| 170 | ws.send('{\r\n' |
| 171 | + '"type": "set-local-desc",\r\n' |
| 172 | + '"sdp": "' + desc.sdp + '"\r\n' |
| 173 | + '}'); |
| 174 | } |
| 175 | |
| 176 | async function getWsOffer() { |
| 177 | const offerPromise = new Promise(function(resolve, reject) { |
| 178 | offerResolve = resolve; |
| 179 | }); |
| 180 | |
| 181 | ws.send('{\r\n' |
| 182 | + '"type": "request-offer",\r\n' |
| 183 | + (is_chrome ? '"is_chrome": 1\r\n' |
| 184 | : '"is_chrome": 0\r\n') |
| 185 | + '}'); |
| 186 | |
| 187 | const sdp = await offerPromise; |
| 188 | |
| 189 | return { type: "offer", sdp: sdp }; |
| 190 | } |
| 191 | |
| 192 | async function getWsIceCandidate(mid) { |
| 193 | console.log("getWsIceCandidate (mid=" + mid + ")"); |
| 194 | |
| 195 | const answerPromise = new Promise(function(resolve, reject) { |
| 196 | iceCandidateResolve = resolve; |
| 197 | }); |
| 198 | |
| 199 | ws.send('{\r\n' |
| 200 | + '"type": "get-ice-candidate",\r\n' |
| 201 | + '"mid": ' + mid + ',\r\n' |
| 202 | + '}'); |
| 203 | |
| 204 | const replyInfo = await answerPromise; |
| 205 | |
| 206 | console.log("got replyInfo '" + replyInfo + "'"); |
| 207 | |
| 208 | if (replyInfo == undefined || replyInfo.candidate == undefined) { |
| 209 | return null; |
| 210 | } |
| 211 | |
| 212 | const replyCandidate = replyInfo.candidate; |
| 213 | const mlineIndex = replyInfo.mlineIndex; |
| 214 | |
| 215 | let result; |
| 216 | try { |
| 217 | result = new RTCIceCandidate( |
| 218 | { |
| 219 | sdpMid: mid, |
| 220 | sdpMLineIndex: mlineIndex, |
| 221 | candidate: replyCandidate |
| 222 | }); |
| 223 | } |
| 224 | catch (e) { |
| 225 | console.log("new RTCIceCandidate FAILED. " + e); |
| 226 | return undefined; |
| 227 | } |
| 228 | |
| 229 | console.log("got result " + result); |
| 230 | |
| 231 | return result; |
| 232 | } |
| 233 | |
| 234 | async function addRemoteIceCandidate(mid) { |
| 235 | const candidate = await getWsIceCandidate(mid); |
| 236 | |
| 237 | if (!candidate) { |
| 238 | return false; |
| 239 | } |
| 240 | |
| 241 | try { |
| 242 | await pc2.addIceCandidate(candidate); |
| 243 | } catch (e) { |
| 244 | console.log("addIceCandidate pc2 FAILED w/ " + e); |
| 245 | return false; |
| 246 | } |
| 247 | |
| 248 | console.log("addIceCandidate pc2 successful. (mid=" |
| 249 | + mid + ", mlineIndex=" + candidate.sdpMLineIndex + ")"); |
| 250 | |
| 251 | return true; |
| 252 | } |
| 253 | |
| 254 | async function onCreateAnswerSuccess(desc) { |
| 255 | console.log(`Answer ${desc.sdp}`); |
| 256 | |
| 257 | try { |
| 258 | await pc2.setLocalDescription(desc); |
| 259 | } catch (e) { |
| 260 | console.log('setLocalDescription pc2 FAILED ' + e); |
| 261 | return; |
| 262 | } |
| 263 | |
| 264 | console.log('setLocalDescription pc2 successful.'); |
| 265 | |
| 266 | try { |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 267 | setWsRemoteDescription(desc); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 268 | } catch (e) { |
| 269 | console.log('setRemoteDescription pc1 FAILED'); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | console.log('setRemoteDescription pc1 successful.'); |
| 274 | |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 275 | if (!await addRemoteIceCandidate(0)) { |
| 276 | return; |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 277 | } |
Jorge E. Moreira | cccac17 | 2020-01-22 14:24:22 -0800 | [diff] [blame] | 278 | await addRemoteIceCandidate(1); |
| 279 | await addRemoteIceCandidate(2); |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | function getPcName(pc) { |
| 283 | return ((pc == pc2) ? "pc2" : "pc1"); |
| 284 | } |
| 285 | |
| 286 | async function onIceCandidate(pc, e) { |
| 287 | console.log( |
| 288 | getPcName(pc) |
| 289 | + ' onIceCandidate ' |
| 290 | + (e.candidate ? ('"' + e.candidate.candidate + '"') : '(null)') |
| 291 | + " " |
| 292 | + (e.candidate ? ('sdmMid: ' + e.candidate.sdpMid) : '(null)') |
| 293 | + " " |
| 294 | + (e.candidate ? ('sdpMLineIndex: ' + e.candidate.sdpMLineIndex) : '(null)')); |
| 295 | |
| 296 | if (!e.candidate) { |
| 297 | return; |
| 298 | } |
| 299 | |
| 300 | let other_pc = (pc == pc2) ? pc1 : pc2; |
| 301 | |
| 302 | if (other_pc) { |
| 303 | try { |
| 304 | await other_pc.addIceCandidate(e.candidate); |
| 305 | } catch (e) { |
| 306 | console.log('addIceCandidate FAILED ' + e); |
| 307 | return; |
| 308 | } |
| 309 | |
| 310 | console.log('addIceCandidate successful.'); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | async function onIceStateChange(pc, e) { |
| 315 | console.log( |
| 316 | 'onIceStateChange ' + getPcName(pc) + " '" + pc.iceConnectionState + "'"); |
| 317 | |
| 318 | if (pc.iceConnectionState == "connected") { |
| 319 | videoElement.srcObject = videoStream; |
| 320 | |
| 321 | startMouseTracking() |
| 322 | } else if (pc.iceConnectionState == "disconnected") { |
| 323 | stopMouseTracking() |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | async function onGotRemoteStream(e) { |
| 328 | console.log('onGotRemoteStream ' + e); |
| 329 | |
| 330 | const track = e.track; |
| 331 | |
| 332 | console.log('track = ' + track); |
| 333 | console.log('track.kind = ' + track.kind); |
| 334 | console.log('track.readyState = ' + track.readyState); |
| 335 | console.log('track.enabled = ' + track.enabled); |
| 336 | |
| 337 | if (track.kind == "video") { |
| 338 | videoStream = e.streams[0]; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | function startMouseTracking() { |
| 343 | if (window.PointerEvent) { |
| 344 | videoElement.addEventListener("pointerdown", onStartDrag); |
| 345 | videoElement.addEventListener("pointermove", onContinueDrag); |
| 346 | videoElement.addEventListener("pointerup", onEndDrag); |
| 347 | } else if (window.TouchEvent) { |
| 348 | videoElement.addEventListener("touchstart", onStartDrag); |
| 349 | videoElement.addEventListener("touchmove", onContinueDrag); |
| 350 | videoElement.addEventListener("touchend", onEndDrag); |
| 351 | } else if (window.MouseEvent) { |
| 352 | videoElement.addEventListener("mousedown", onStartDrag); |
| 353 | videoElement.addEventListener("mousemove", onContinueDrag); |
| 354 | videoElement.addEventListener("mouseup", onEndDrag); |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | function stopMouseTracking() { |
| 359 | if (window.PointerEvent) { |
| 360 | videoElement.removeEventListener("pointerdown", onStartDrag); |
| 361 | videoElement.removeEventListener("pointermove", onContinueDrag); |
| 362 | videoElement.removeEventListener("pointerup", onEndDrag); |
| 363 | } else if (window.TouchEvent) { |
| 364 | videoElement.removeEventListener("touchstart", onStartDrag); |
| 365 | videoElement.removeEventListener("touchmove", onContinueDrag); |
| 366 | videoElement.removeEventListener("touchend", onEndDrag); |
| 367 | } else if (window.MouseEvent) { |
| 368 | videoElement.removeEventListener("mousedown", onStartDrag); |
| 369 | videoElement.removeEventListener("mousemove", onContinueDrag); |
| 370 | videoElement.removeEventListener("mouseup", onEndDrag); |
| 371 | } |
| 372 | } |
| 373 | |
Jorge E. Moreira | cfd0840 | 2020-01-13 18:36:33 -0800 | [diff] [blame] | 374 | function startKeyboardTracking() { |
| 375 | document.addEventListener('keydown', onKeyEvent); |
| 376 | document.addEventListener('keyup', onKeyEvent); |
| 377 | } |
| 378 | |
| 379 | function stopKeyboardTracking() { |
| 380 | document.removeEventListener('keydown', onKeyEvent); |
| 381 | document.removeEventListener('keyup', onKeyEvent); |
| 382 | } |
| 383 | |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 384 | function onStartDrag(e) { |
| 385 | e.preventDefault(); |
| 386 | |
| 387 | // console.log("mousedown at " + e.pageX + " / " + e.pageY); |
| 388 | mouseIsDown = true; |
| 389 | |
| 390 | sendMouseUpdate(true, e); |
| 391 | } |
| 392 | |
| 393 | function onEndDrag(e) { |
| 394 | e.preventDefault(); |
| 395 | |
| 396 | // console.log("mouseup at " + e.pageX + " / " + e.pageY); |
| 397 | mouseIsDown = false; |
| 398 | |
| 399 | sendMouseUpdate(false, e); |
| 400 | } |
| 401 | |
| 402 | function onContinueDrag(e) { |
| 403 | e.preventDefault(); |
| 404 | |
| 405 | // console.log("mousemove at " + e.pageX + " / " + e.pageY + ", down=" + mouseIsDown); |
| 406 | if (mouseIsDown) { |
| 407 | sendMouseUpdate(true, e); |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | function sendMouseUpdate(down, e) { |
Jorge E. Moreira | 19bfe07 | 2019-11-20 15:25:52 -0800 | [diff] [blame] | 412 | var x = e.offsetX; |
| 413 | var y = e.offsetY; |
| 414 | |
| 415 | const videoWidth = videoElement.videoWidth; |
| 416 | const videoHeight = videoElement.videoHeight; |
| 417 | const elementWidth = videoElement.width; |
| 418 | const elementHeight = videoElement.height; |
| 419 | |
| 420 | // vh*ew > eh*vw? then scale h instead of w |
| 421 | const scaleHeight = videoHeight * elementWidth > videoWidth * elementHeight; |
| 422 | var elementScaling = 0, videoScaling = 0; |
| 423 | if (scaleHeight) { |
| 424 | elementScaling = elementHeight; |
| 425 | videoScaling = videoHeight; |
| 426 | } else { |
| 427 | elementScaling = elementWidth; |
| 428 | videoScaling = videoWidth; |
| 429 | } |
| 430 | |
| 431 | // Substract the offset produced by the difference in aspect ratio if any. |
| 432 | if (scaleHeight) { |
| 433 | x -= (elementWidth - elementScaling * videoWidth / videoScaling) / 2; |
| 434 | } else { |
| 435 | y -= (elementHeight - elementScaling * videoHeight / videoScaling) / 2; |
| 436 | } |
| 437 | |
| 438 | // Convert to coordinates relative to the video |
| 439 | x = videoScaling * x / elementScaling; |
| 440 | y = videoScaling * y / elementScaling; |
Jorge E. Moreira | a18ff1a | 2019-12-17 18:20:56 -0800 | [diff] [blame] | 441 | |
| 442 | ws.send('{\r\n' |
| 443 | + '"type": "set-mouse-position",\r\n' |
| 444 | + '"down": ' + (down ? "1" : "0") + ',\r\n' |
| 445 | + '"x": ' + Math.trunc(x) + ',\r\n' |
| 446 | + '"y": ' + Math.trunc(y) + '\r\n' |
| 447 | + '}'); |
| 448 | } |
| 449 | |
Jorge E. Moreira | cfd0840 | 2020-01-13 18:36:33 -0800 | [diff] [blame] | 450 | function onKeyEvent(e) { |
| 451 | e.preventDefault(); |
| 452 | ws.send('{"type": "key-event","keycode": "'+e.code+'", "event_type": "'+e.type+'"}'); |
| 453 | } |