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packetLoss.html
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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>Packetloss Simulation</title>
<style>
body {
/*background-color: cyan; */
}
p {
margin: 2px;
}
.row {
display: flex;
}
.mirror {
transform: scaleX(-1);
}
</style>
</head>
<body>
<div class="row">
<div>
<h3>Source media</h3>
<video id="source" class="mirror" autoplay playsinline muted></video>
<p id="source_stats"></p>
</div>
<div>
<h3>Media modified by WebCodecs </h3>
<video id="modded" class="mirror" autoplay playsinline></video>
<p id="modded_stats"></p>
</div>
</div>
<h3>Media Capture setup</h3>
<p>Use headphones to avoid audio feedback</p>
<label for="video_devices">Choose your camera source</label>
<select name="video_devices" id="video_devices" class="senderControl"></select>
<label for="audio_devices">Choose your microphone source</label>
<select name="audio_devices" id="audio_devices" class="senderControl"></select>
<br>
<button id="start">Start</button>
<button id="stop">Stop</button>
<h3>Control Encoding</h3>
<button id="send_keyframe">Send KeyFrame</button>
<form id="encoding_form" onsubmit="return false">
<label for="video_frame_rate">Video frame rate:</label>
<input type="number" id="video_frame_rate" value="30">
<label for="video_bitrate">Video bitrate:</label>
<input type="text" id="video_bitrate" value="2,000,000" pattern="([0-9]|,| |_|\.)+">
<label for="keyframe_rate">KeyFrame Rate:</label>
<input type="number" id="keyframe_rate" value="150">
<label for="audio_sample_rate">Audio sample rate:</label>
<!-- OPUS is only working with 48khz-->
<input type="text" id="audio_sample_rate" value="48,000" pattern="([0-9]|,| |_|\.)+" disabled>
<label for="audio_bitrate">Audio bitrate:</label>
<input type="text" id="audio_bitrate" value="40,000" pattern="([0-9]|,| |_|\.)+" min="6000">
<button id="apply_config">Submit</button>
</form>
<h3>Simulate delay</h3>
<label for="delay_range">Add a delay in ms (up to 5000):</label>
<input type="range" min="0" max="5000" value="0" id="delay_range">
<!--oninput="this.nextElementSibling.value = `${this.value} ms`"-->
<span><output id="delay">0</output> ms</span>
<h3>Simulate Packet Loss without retransmissions</h3>
<p>
video:
<button class="video_loss" value="0">No loss</button>
<button class="video_loss" value="0.0001">0.01%</button>
<button class="video_loss" value="0.001">0.1%</button>
<button class="video_loss" value="0.01">1%</button>
<button class="video_loss" value="10">10%</button>
</p>
<p>
audio:
<button class="audio_loss" value="0">No loss</button>
<button class="audio_loss" value="0.01">1%</button>
<button class="audio_loss" value="0.05">5%</button>
<button class="audio_loss" value="0.10">10%</button>
<button class="audio_loss" value="0.20">20%</button>
<button class="audio_loss" value="0.40">40%</button>
</p>
<br>
<span id="message"></span>
<script>
const sourceMedia = document.querySelector('video#source');
const moddedMedia = document.querySelector('video#modded');
const sourceStats = document.querySelector('p#source_stats');
const moddedStats = document.querySelector('p#modded_stats');
const videoDeviceSelect = document.querySelector('select#video_devices');
const audioDeviceSelect = document.querySelector('select#audio_devices');
const startBtn = document.querySelector('button#start');
const messageSpan = document.querySelector('span#message');
const endBtn = document.querySelector('button#stop');
const sendKeyFrameBtn = document.querySelector('button#send_keyframe');
const delayRange = document.querySelector('input#delay_range');
const delayInput = document.querySelector('output#delay');
let delay = 0;
const videoFrameRateInput = document.querySelector('input#video_frame_rate');
const videoBitrateInput = document.querySelector('input#video_bitrate');
const keyFrameRateInput = document.querySelector('input#keyframe_rate');
const audioSampleRateInput = document.querySelector('input#audio_sample_rate');
const audioBitrateInput = document.querySelector('input#audio_bitrate');
const encoderConfigBtn = document.querySelector('button#apply_config');
const VIDEO_WIDTH = 640;
const VIDEO_HEIGHT = 480;
const FRAME_RATE = 30;
const PAYLOAD_SIZE = 200; // 90
let videoPacketLossPct = 0, audioPacketLossPct = 0;
let videoFrameCounter = 0, audioFrameCounter = 0;
let manualSendKeyFrame = false;
// Tracks for modified audio and video
const videoGenerator = new MediaStreamTrackGenerator({kind: 'video'});
const videoWriter = videoGenerator.writable.getWriter();
const audioGenerator = new MediaStreamTrackGenerator({kind: 'audio'});
const audioWriter = audioGenerator.writable.getWriter();
const moddedStream = new MediaStream([videoGenerator, audioGenerator]);
moddedMedia.srcObject = moddedStream;
let audioDelayTimeout, videoDelaytimeout;
/*
* Helper functions
*/
// ToDo: need to make this cancellable
const sleep = ms => new Promise((resolve) => setTimeout(resolve, ms));
// allow spacers for easier entry of large numbers
const cleanInput = input => parseInt(input.replaceAll(/[,_ .]/ig, ""));
// Change camera and mic devices
let videoDevices = [];
let audioDevices = [];
async function getDevices() {
let devices = await navigator.mediaDevices.enumerateDevices();
videoDevices = devices.filter(device => device.kind === 'videoinput');
audioDevices = devices.filter(device => device.kind === 'audioinput');
console.log("video devices:", videoDevices);
console.log("audio devices:", audioDevices);
videoDevices.forEach(device => {
const option = document.createElement('option');
option.text = device.label;
videoDeviceSelect.appendChild(option);
});
audioDevices.forEach(device => {
const option = document.createElement('option');
option.text = device.label;
audioDeviceSelect.appendChild(option);
});
}
function showStats(source, target){
let decodedFrames = 0,
droppedFrames = 0,
startTime = new Date().getTime(),
initialTime = new Date().getTime();
window.setInterval(()=> {
//see if webkit stats are available; exit if they aren't
if (!source.webkitDecodedFrameCount) {
console.log("Video FPS calcs not supported");
}
//get the stats
else {
let currentTime = new Date().getTime();
let deltaTime = (currentTime - startTime) / 1000;
let totalTime = (currentTime - initialTime) / 1000;
startTime = currentTime;
// Calculate decoded frames per sec.
let currentDecodedFPS = (source.webkitDecodedFrameCount - decodedFrames) / deltaTime;
let decodedFPSavg = source.webkitDecodedFrameCount / totalTime;
decodedFrames = source.webkitDecodedFrameCount;
// Calculate dropped frames per sec.
let currentDroppedFPS = (source.webkitDroppedFrameCount - droppedFrames) / deltaTime;
let droppedFPSavg = source.webkitDroppedFrameCount / totalTime;
droppedFrames = source.webkitDroppedFrameCount;
//write the results to a table
target.innerHTML =
"<table><tr><th>Type</th><th>Total</th><th>Avg</th><th>Current</th></tr>" +
"<tr><td>Decoded</td><td>" + decodedFrames + "</td><td>" + decodedFPSavg.toFixed() + "</td><td>" + currentDecodedFPS.toFixed() + "</td></tr>" +
"<tr><td>Dropped</td><td>" + droppedFrames + "</td><td>" + droppedFPSavg.toFixed() + "</td><td>" + currentDroppedFPS.toFixed() + "</td></tr>" +
"<tr><td>All</td><td>" + (decodedFrames + droppedFrames) + "</td><td>" + (decodedFPSavg + droppedFPSavg).toFixed() + "</td><td>" + (currentDecodedFPS + currentDroppedFPS).toFixed() + "</td></tr></table>" +
"Camera resolution: " + source.videoWidth + " x " + source.videoHeight;
}
}, 2000);
}
sourceMedia.onplaying = () => {
console.log("source playing stream:", sourceMedia.srcObject);
if(sourceStats.innerText === "")
showStats(sourceMedia, sourceStats);
}
moddedMedia.onplaying = () => {
console.log("modded media playing stream:", moddedMedia.srcObject);
if(moddedStats.innerText === "")
showStats(moddedMedia, moddedStats);
}
async function getMedia() {
if(sourceMedia?.srcObject?.active){
sourceMedia.srcObject.getTracks().forEach(track=>track.stop());
}
document.querySelectorAll('video').forEach(element => {
element.height = VIDEO_HEIGHT;
element.width = VIDEO_WIDTH;
});
let videoSource = videoDevices[videoDeviceSelect.selectedIndex || 0]?.deviceId;
let audioSource = audioDevices[audioDeviceSelect.selectedIndex || 0]?.deviceId;
const constraints = {
video:
{
height: {ideal: VIDEO_HEIGHT}, width: {ideal: VIDEO_WIDTH}, frameRate: FRAME_RATE,
deviceId: videoSource ? {exact: videoSource} : undefined
},
audio: {
deviceId: audioSource ? {exact: audioSource} : undefined
}
}
const stream = await navigator.mediaDevices.getUserMedia(constraints);
sourceMedia.srcObject = stream;
window.sourceStream = stream; // for debugging
console.log(`Capture camera with device ${stream.getTracks()[0].label}`);
}
videoDeviceSelect.onchange = getMedia;
audioDeviceSelect.onchange = getMedia;
/*
* Packetloss function
*/
// ToDo: audio packetloss doesn't sound realistic
function addPacketLoss(chunk, type) {
let chunkWithLoss = new Uint8Array(chunk.byteLength);
chunk.copyTo(chunkWithLoss);
const packetLoss = type === 'video' ? videoPacketLossPct : audioPacketLossPct;
for (let n = 16; n <= chunkWithLoss.byteLength; n += PAYLOAD_SIZE) {
if (Math.random() <= packetLoss)
chunkWithLoss.fill(0, n, n + PAYLOAD_SIZE);
}
const chunkObj = {
timestamp: chunk.timestamp,
type: chunk.type,
data: chunkWithLoss
};
if (type === 'video')
return new EncodedVideoChunk(chunkObj);
else if (type === 'audio')
return new EncodedAudioChunk(chunkObj);
}
/*
* WebCodecs setup
*/
let videoConfig, audioConfig;
function setCodecConfig() {
videoConfig = {
codec: "vp8",
width: VIDEO_WIDTH,
height: VIDEO_HEIGHT,
bitrate: cleanInput(videoBitrateInput.value),
framerate: cleanInput(videoFrameRateInput.value),
};
audioConfig = {
numberOfChannels: 1,
sampleRate: cleanInput(audioSampleRateInput.value),
codec: 'opus',
bitrate: cleanInput(audioBitrateInput.value)
}
}
setCodecConfig();
// Video decoder
const videoDecoder = new VideoDecoder({
output: async frame => {
await videoWriter.write(frame);
frame.close();
},
error: e => console.error(e.message)
});
videoDecoder.configure(videoConfig);
// Audio decoder
const audioDecoder = new AudioDecoder({
output: async frame => {
/*if (videoFrameCounter % 120 === 0)
console.log("audioFrame decoder", frame);*/
await audioWriter.write(frame);
frame.close();
},
error: e => console.error(e.message)
});
audioDecoder.configure(audioConfig);
// Encoder
async function handleEncodedVideo(chunk, metadata) {
if (metadata.decoderConfig) {
console.log("video metadata", metadata)
}
const modifiedChunk = addPacketLoss(chunk, 'video');
await sleep(delayInput.value.match(/[0-9]+/g)[0]);
videoDecoder.decode(modifiedChunk);
}
async function handleEncodedAudio(chunk, metadata) {
if (metadata.decoderConfig) {
console.log("audio metadata", metadata)
}
const modifiedChunk = addPacketLoss(chunk, 'audio');
await sleep(delayInput.value.match(/[0-9]+/g)[0]);
audioDecoder.decode(modifiedChunk);
}
const videoEncoder = new VideoEncoder({
output: handleEncodedVideo,
error: e => console.error(e.message)
});
const audioEncoder = new AudioEncoder({
output: handleEncodedAudio,
error: e => console.error(e.message)
});
VideoEncoder.isConfigSupported(videoConfig).then(supported => {
if (supported) {
videoEncoder.configure(videoConfig);
} else {
console.error("WebCodecs video encoder config error");
messageSpan.textContent = "WebCodecs video encoder config error";
startBtn.disabled = true;
}
});
AudioEncoder.isConfigSupported(audioConfig).then(supported => {
if (supported) {
audioEncoder.configure(audioConfig);
} else {
console.error("WebCodecs audio encoder config error");
messageSpan.textContent = "WebCodecs audio encoder config error";
startBtn.disabled = true;
}
});
async function start() {
startBtn.disabled = true;
console.log("starting");
// Insertable Stream
const [videoTrack] = sourceMedia.srcObject.getVideoTracks();
const [audioTrack] = sourceMedia.srcObject.getAudioTracks();
const videoTrackProcessor = new MediaStreamTrackProcessor(videoTrack);
const audioTrackProcessor = new MediaStreamTrackProcessor(audioTrack);
const videoReader = videoTrackProcessor.readable.getReader();
const audioReader = audioTrackProcessor.readable.getReader();
// ToDo: move to worker
// Note: combining these doesn't work
async function videoLoop() {
const videoFrameReader = await videoReader.read();
if (videoFrameReader.done)
return;
const videoFrame = videoFrameReader.value;
if (videoEncoder.encodeQueueSize > 2) {
console.log("video encoder overwhelmed, dropping frame", videoFrame)
videoFrame.close();
} else {
const keyFrame = videoFrameCounter % keyFrameRateInput.value === 0 || manualSendKeyFrame;
if (manualSendKeyFrame) {
console.log(`set ${videoFrameCounter} to keyframe`);
manualSendKeyFrame = false;
manualSendKeyFrame.disabled = false;
}
await videoEncoder.encode(videoFrame, {keyFrame});
videoFrameCounter++;
videoFrame.close();
}
await sleep(delayInput.value.match(/[0-9]+/g)[0])
await videoLoop();
}
async function audioLoop() {
const audioFrameReader = await audioReader.read();
if (audioFrameReader.done) return;
const audioFrame = audioFrameReader.value;
if (audioEncoder.encodeQueueSize > 2) {
console.log("audio encoder overwhelmed, dropping frame", audioFrame)
audioFrame.close();
} else {
await audioEncoder.encode(audioFrame);
audioFrameCounter++;
audioFrame.close();
}
await audioLoop();
}
await Promise.all([videoLoop(), audioLoop()]);
console.log("exiting media loops")
videoDecoder.flush();
videoEncoder.close();
audioEncoder.close();
}
// GUI controls
startBtn.onclick = start;
endBtn.onclick = () => sourceMedia.srcObject.getTracks().forEach(track => track.stop());
// modify encoding parameters on the fly
encoderConfigBtn.onclick = () => {
setCodecConfig();
videoEncoder.configure(videoConfig);
videoEncoder.flush();
videoDecoder.configure(videoConfig);
manualSendKeyFrame = true;
videoDecoder.flush();
audioEncoder.configure(audioConfig);
audioEncoder.flush();
audioDecoder.configure(audioConfig);
audioDecoder.flush();
}
document.querySelectorAll('button.video_loss').forEach(btn => btn.onclick = () => {
videoPacketLossPct = btn.value
document.querySelectorAll('button.video_loss').forEach(btn => btn.style.color = "black");
btn.style.color = "red";
console.log(`video packet loss set to ${videoPacketLossPct}`);
});
document.querySelectorAll('button.audio_loss').forEach(btn => btn.onclick = () => {
audioPacketLossPct = btn.value
document.querySelectorAll('button.audio_loss').forEach(btn => btn.style.color = "black");
btn.style.color = "red";
console.log(`audio packet loss set to ${audioPacketLossPct}`);
});
delayRange.oninput = (e) => {
delayInput.value = e.target.value;
// Audio delay doesn't ever reset when the delay is lowered
// ToDo: try to cancel the timeout?
// This didn't do anything
// Go back to <input type="range" min="0" max="5000" value="0" id="delay_range" oninput="this.nextElementSibling.value = `${this.value} ms`">??
/*
if(this.value < delay){
setTimeout(()=>{
delay = e.target.value;
}, 1000);
videoEncoder.flush();
manualSendKeyFrame = true;
audioEncoder.flush();
videoDecoder.flush();
audioDecoder.flush();
}
else
*/
delay = e.target.value;
}
sendKeyFrameBtn.onclick = () => {
manualSendKeyFrame.disabled = true;
manualSendKeyFrame = true;
}
async function main() {
await getDevices();
await getMedia();
}
main().catch(err => console.error(err));
</script>
</body>
</html>