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StatsForNerds: cleanup and plot packets lost #1414

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Oct 18, 2024
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StatsForNerds: cleanup and plot packets lost #1414

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57 changes: 34 additions & 23 deletions src/components/VideoPlayerStatsForNerds.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

<script lang="ts" setup>
import { WebRTCStats } from '@peermetrics/webrtc-stats'
import { onMounted, onUnmounted, ref, watch } from 'vue'
import { onBeforeUnmount, onMounted, onUnmounted, ref, watch } from 'vue'

import { useVideoStore } from '@/stores/video'
import { WebRTCStatsEvent } from '@/types/video'
Expand Down Expand Up @@ -34,6 +34,7 @@ const props = defineProps({
const canvasRef = ref(null)
const framerateData = ref([])
const bitrateData = ref([])
const packetLostData = ref([])
let animationFrameId = null
let intervalId = null
let bitrate = 0
Expand All @@ -54,11 +55,13 @@ let framedrops = 0

let packetLossPercentage = 0
let framerate = 0
let packetLostDelta = 0
let videoHeight = 0

const maxDataPoints = 100
let maxBitrateReceived = 1000 // max bitrate received, used for scaling the plot
let maxFramerateReceived = 30 // max framerate received, used for scaling the plot
let maxPacketLost = 10 // max packet lost, used for scaling the plot
let absoluteMaxFrameRate = 120 // Absolute maximum framerate, used for dealing with outliers

const plotHeight = 60 // Height of the plot area
Expand All @@ -82,28 +85,29 @@ function draw(): void {

ctx.clearRect(0, 0, width, height)

// Draw bitrate plot
ctx.strokeStyle = 'rgb(255, 165, 0)' // Orange
ctx.lineWidth = 1
ctx.beginPath()
for (let i = 0; i < bitrateData.value.length; i++) {
const x = (i / (maxDataPoints - 1)) * width
const y = height - normalizeValue(bitrateData.value[i], maxBitrateReceived)
if (i === 0) ctx.moveTo(x, y)
else ctx.lineTo(x, y)
}
ctx.stroke()

// Draw framerate plot
ctx.strokeStyle = 'rgb(0, 255, 0)' // Green
ctx.beginPath()
for (let i = 0; i < framerateData.value.length; i++) {
const x = (i / (maxDataPoints - 1)) * width
const y = height - normalizeValue(framerateData.value[i], maxFramerateReceived)
if (i === 0) ctx.moveTo(x, y)
else ctx.lineTo(x, y)
/**
*
* @param {number[]} data - The data to plot
* @param {string} color - The color of the plot
* @param {number} max - The maximum value of the data, used for scaling the plot
*/
function drawPlot(data: number[], color: string, max: number): void {
ctx.strokeStyle = color
ctx.lineWidth = 1
ctx.beginPath()
for (let i = 0; i < data.length; i++) {
const x = (i / (maxDataPoints - 1)) * width
const y = height - normalizeValue(data[i], max)
if (i === 0) ctx.moveTo(x, y)
else ctx.lineTo(x, y)
}
ctx.stroke()
}
ctx.stroke()

// Draw the plots
drawPlot(bitrateData.value, 'rgb(255, 165, 0)', maxBitrateReceived)
drawPlot(framerateData.value, 'rgb(0, 255, 0)', maxFramerateReceived)
drawPlot(packetLostData.value, 'rgb(255, 0, 0)', maxPacketLost)

// Print text stats
const color = connectionLost ? 'red' : 'white'
Expand Down Expand Up @@ -138,13 +142,15 @@ const webrtcStats = new WebRTCStats({ getStatsInterval: 100 })
function update(): void {
framerateData.value.push(framerate)
bitrateData.value.push(bitrate)
packetLostData.value.push(Math.min(packetLostDelta, maxPacketLost))
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Won't this put a roof on 10?

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yes. the reasoning here is that the number of lost packets is not as relevant as the fact that packets were lost, so if I left it "unbounded", and we had 1000 packets lost between two messages, our ceiling would go to 1000. If we then lost 1 packet, it would be so small in the plot we wouldn't be able to see them.

image
In this image, for instance, I don't really care about how many packets were lost. I care that they were lost and we managed to recover.
Does that make sense?

TLDR: I put a low value so we can always notice EVERY packet lost

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Makes a lot of sense!

if (framerateData.value.length > maxDataPoints) framerateData.value.shift()
if (bitrateData.value.length > maxDataPoints) bitrateData.value.shift()
if (packetLostData.value.length > maxDataPoints) packetLostData.value.shift()

// Update max values
maxBitrateReceived = Math.max(maxBitrateReceived, ...bitrateData.value)
maxFramerateReceived = Math.max(maxFramerateReceived, ...framerateData.value)
if (maxFramerateReceived > absoluteMaxFrameRate) maxFramerateReceived = absoluteMaxFrameRate
maxFramerateReceived = Math.min(maxFramerateReceived, absoluteMaxFrameRate)
}

watch(videoStore.activeStreams, (streams): void => {
Expand Down Expand Up @@ -174,6 +180,7 @@ onMounted(() => {
const newBitrate = videoData.bitrate / 1000
bitrate = bitrate * 0.8 + newBitrate * 0.2
}
packetLostDelta = videoData.packetsLost - packetsLost
packetsLost = videoData.packetsLost
nackCount = videoData.nackCount
pliCount = videoData.pliCount
Expand All @@ -200,6 +207,10 @@ onUnmounted(() => {
clearInterval(intervalId)
cancelAnimationFrame(animationFrameId)
})

onBeforeUnmount(() => {
webrtcStats.destroy()
})
</script>

<style scoped>
Expand Down
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