VFX2/script.js

// Define a debug mode variable
let debugMode = true

const canvas = document.getElementById("videoCanvas")
const ctx = canvas.getContext("2d")

let videosToLoad = 2
const maxVideosToLoad = 9
const videos = []
let videosLoaded = 0
let aspectRatio = 1

let cachedVideos = []

let showText = true

function debugLog(...args) {
  if (debugMode) {
    console.log(...args)
  }
}

function loadVideos(num) {
  debugLog(`Loading ${num} videos`)
  while (num > 0) {
    let video = createVideoElement()
    video.addEventListener("loadedmetadata", handleVideoLoaded)
    video.addEventListener("ended", handleVideoEnded)
    video.addEventListener("error", handleVideoEnded)
    video.src = selectRandomVideo(video)
    videos.push(video)
    num--
  }
  while (num < 0) {
    let video = videos.pop()
    video.removeEventListener("loadedmetadata", handleVideoLoaded)
    video.removeEventListener("ended", handleVideoEnded)
    num++
  }
}

videos.forEach((video) => {
  video.addEventListener("loadedmetadata", handleVideoLoaded)
  video.addEventListener("ended", handleVideoEnded)
})

function createVideoElement() {
  const video = document.createElement("video")
  video.autoplay = true
  video.muted = true
  return video
}

function handleVideoLoaded() {
  videosLoaded++
  if (videosLoaded === videos.length) {
    updateCanvasSize()
    drawVideos()
  }
}

function handleVideoEnded(event) {
  const video = event.target
  //debugLog(video,event)
  selectRandomVideo(video)
}

function drawVideos() {
  ctx.clearRect(0, 0, canvas.width, canvas.height)

  let blendModes = ["source-over","overlay","screen"]

  videos.forEach((video,i) => {
    // Calculate scaling factor to fit the canvas
    const scale = Math.max(canvas.width/video.videoWidth, canvas.height/video.videoHeight)

    // Calculate scaled dimensions
    const scaledWidth = video.videoWidth * scale
    const scaledHeight = video.videoHeight * scale

    // Calculate horizontal and vertical centering offset
    const offsetX = (canvas.width-scaledWidth)/2
    const offsetY = (canvas.height-scaledHeight)/2

    // Use default blend mode for first video (i=0), repeat the rest of blendModes
    if (i === 0) {
      ctx.globalCompositeOperation = blendModes[0]
    } else {
      ctx.globalCompositeOperation = blendModes[(i - 1) % (blendModes.length - 1) + 1]
    }

    // Draw the current video frame onto the canvas
    ctx.drawImage(video, offsetX, offsetY, scaledWidth, scaledHeight)

    // Reset composite operation
    ctx.globalCompositeOperation = "source-over"
  })

  // If showText is true, draw debug text
  if (showText) {
    drawDebugText()
  }

  // Request next frame
  requestAnimationFrame(drawVideos)
}

function drawDebugText() {
  // Set font style and color
  ctx.font = "16px Arial"
  ctx.fillStyle = "white"

  let corners = [[0, 0], [1, 1], [0, 1], [1, 0]]; // Top-left, bottom-right, top-right, bottom-left
  let padding = 20

  videos.forEach((video, i) => {
    // Get the corner coordinates for the current video
    const corner = corners[i]

    // Calculate the position of the text in the corner
    let positionX = corner[0] ? canvas.width : padding
    let positionY = corner[1] ? canvas.height : padding

    // Adjust position to ensure text is within the canvas bounds
    //positionX = Math.max(0, Math.min(positionX, canvas.width - ctx.measureText(getFilename(video.src)).width))
    positionY = Math.max(0, Math.min(positionY, canvas.height - padding*3))

    // Set text alignment based on corner
    ctx.textAlign = corner[0] ? "right" : "left"
    ctx.textBaseline = corner[1]  ? "bottom" : "top"

    // Draw debug text for the video
    ctx.fillText(getFilename(video.src), positionX, positionY)
    ctx.fillText(`Dimensions: ${video.videoWidth}x${video.videoHeight} ()`, positionX, positionY + 20)
    ctx.fillText(formatTime(video.currentTime) + "/" + formatTime(video.duration), positionX, positionY + 40)
    // Add more debug information as needed
  })
}

// Function to extract filename from full path
function getFilename(src) {
  const parts = src.split('/')
  return decodeURIComponent(parts[parts.length - 1].replace(/\%20/g, ' '))
}

// Helper function to format time in HH:MM:SS format
function formatTime(seconds) {
  const hours = Math.floor(seconds / 3600)
  const minutes = Math.floor((seconds % 3600) / 60)
  const remainingSeconds = Math.floor(seconds % 60)
  return `${(hours?hours.toString().padStart(2, '0')+':':'')}${minutes.toString().padStart(2, '0')}:${remainingSeconds.toString().padStart(2, '0')}`
}

function updateCanvasSize() {
  aspectRatio = Math.max(
    videos[0].videoWidth / videos[0].videoHeight,
    videos[1].videoWidth / videos[1].videoHeight
  )

  canvas.width = window.innerWidth
  canvas.height = window.innerWidth / aspectRatio
}

window.addEventListener("resize", updateCanvasSize)

function getSourceFiles() {
  debugLog("Getting source files")
  return fetch("/api/videos")
    .then(response => response.json())
    .then(videoFiles => {
      debugLog("Success")
      cachedVideos = videoFiles;
    })
    .catch(error => console.error("Error fetching videos:", error));
}

function selectRandomVideo(videoElement) {
  if (cachedVideos.length) {
    const currentSrc = videoElement.src;
    const filteredVideos = cachedVideos.filter(video => video.src !== currentSrc);
    if (filteredVideos.length > 0) {
      const randomIndex = Math.floor(Math.random() * filteredVideos.length);
      const randomVideo = filteredVideos[randomIndex];
      videoElement.src = randomVideo.src;
    } else {
      debugLog("No other videos available.");
      getSourceFiles().then(()=>{
        selectRandomVideo(videoElement)
      })
    }
  } else {
    debugLog("Cache empty, doing new request")
    getSourceFiles().then(()=>{
      selectRandomVideo(videoElement)
    })
  }
}

document.addEventListener('keydown', function(event) {
  console.log('keyDown',event)
  // Check if the pressed key is the one you want to bind
  if (event.key === 'Enter') {
    showText = !showText
  }
  if (event.key === 'ArrowDown') {
    loadVideos(-1)
  }
  if (event.key === 'ArrowUp') {
    loadVideos(1)
  }
})

getSourceFiles().then(()=>{
  loadVideos(videosToLoad)
  updateCanvasSize()
})