refactor web dir

flutter/web/libs/yuv.js

@@ -0,0 +1,73 @@
+var wasmExports;
+
+fetch('yuv.wasm').then(function (res) { return res.arrayBuffer(); })
+  .then(function (file) { return WebAssembly.instantiate(file); })
+  .then(function (wasm) {
+    wasmExports = wasm.instance.exports;
+    console.log('yuv ready');
+  });
+
+var yPtr, yPtrLen, uPtr, uPtrLen, vPtr, vPtrLen, outPtr, outPtrLen;
+let testSpeed = [0, 0];
+function I420ToARGB(yb) {
+  if (!wasmExports) return;
+  var tm0 = new Date().getTime();
+  var { malloc, free, memory } = wasmExports;
+  var HEAPU8 = new Uint8Array(memory.buffer);
+  let n = yb.y.bytes.length;
+  if (yPtrLen != n) {
+    if (yPtr) free(yPtr);
+    yPtrLen = n;
+    yPtr = malloc(n);
+  }
+  HEAPU8.set(yb.y.bytes, yPtr);
+  n = yb.u.bytes.length;
+  if (uPtrLen != n) {
+    if (uPtr) free(uPtr);
+    uPtrLen = n;
+    uPtr = malloc(n);
+  }
+  HEAPU8.set(yb.u.bytes, uPtr);
+  n = yb.v.bytes.length;
+  if (vPtrLen != n) {
+    if (vPtr) free(vPtr);
+    vPtrLen = n;
+    vPtr = malloc(n);
+  }
+  HEAPU8.set(yb.v.bytes, vPtr);
+  var w = yb.format.displayWidth;
+  var h = yb.format.displayHeight;
+  n = w * h * 4;
+  if (outPtrLen != n) {
+    if (outPtr) free(outPtr);
+    outPtrLen = n;
+    outPtr = malloc(n);
+    HEAPU8.fill(255, outPtr, outPtr + n);
+  }
+  // var res = wasmExports.I420ToARGB(yPtr, yb.y.stride, uPtr, yb.u.stride, vPtr, yb.v.stride, outPtr, w * 4, w, h);
+  // var res = wasmExports.AVX_YUV_to_ARGB(outPtr, yPtr, yb.y.stride, uPtr, yb.u.stride, vPtr, yb.v.stride, w, h);
+  var res = wasmExports.yuv420_rgb24_std(w, h, yPtr, uPtr, vPtr, yb.y.stride, yb.v.stride, outPtr, w * 4, 1);
+  var out = HEAPU8.slice(outPtr, outPtr + n);
+  testSpeed[1] += new Date().getTime() - tm0;
+  testSpeed[0] += 1;
+  if (testSpeed[0] > 30) {
+    console.log('yuv: ' + parseInt('' + testSpeed[1] / testSpeed[0]));
+    testSpeed = [0, 0];
+  }
+  return out;
+}
+
+var currentFrame;
+self.addEventListener('message', (e) => {
+  currentFrame = e.data;
+});
+
+function run() {
+  if (currentFrame) {
+    self.postMessage(I420ToARGB(currentFrame));
+    currentFrame = undefined;
+  }
+  setTimeout(run, 1);
+}
+
+run();