typed-arrays

问题 I have an ArrayBuffer which looks like: This buffer is placed under variable named myBuffer and what I'm interested in, is to get the Uint8Array from this object. I tried to loop as: myBuffer.forEach(function(element) { console.log(element); }); and to directly access to the Array as: console.log(myBuffer['[[Uint8Array]]']); console.log(myBuffer['Uint8Array']); but seems none of this is the correct approach 回答1: Those pseudo-properties you are seeing are something the developer console is

问题 I have an ArrayBuffer which looks like: This buffer is placed under variable named myBuffer and what I'm interested in, is to get the Uint8Array from this object. I tried to loop as: myBuffer.forEach(function(element) { console.log(element); }); and to directly access to the Array as: console.log(myBuffer['[[Uint8Array]]']); console.log(myBuffer['Uint8Array']); but seems none of this is the correct approach 回答1: Those pseudo-properties you are seeing are something the developer console is

问题 I'd like to convert an AudioBuffer to a Blob so that I can create an ObjectURL from it and then download the audio file. let rec = new Recorder(async(chunks) => { var blob = new Blob(chunks, { type: 'audio/mp3' }); var arrayBuffer = await blob.arrayBuffer(); const audioContext = new AudioContext() await audioContext.decodeAudioData(arrayBuffer, (audioBuffer) => { // How to I now convert the AudioBuffer into an ArrayBuffer => Blob ? } 回答1: An AudioBuffer contains non-interleaved Float32Array

问题 I was playing around with JavaScript's TypedArrays when I noticed something a bit strange. I figured the implementation of the TypedArray.prototype.set method would simply copy values incrementally. Thus, I tried tricking the system to see this behavior: var ar = new Uint8Array([1,2,3,4,5,6,7,8]); ar.set(ar.subarray(0,6),2); I perceived that, if it started copying from ar at 0, but overwrote values at 2, the subarray would be manipulated, and thus start looping once it reached index 2.

问题 I was playing around with JavaScript's TypedArrays when I noticed something a bit strange. I figured the implementation of the TypedArray.prototype.set method would simply copy values incrementally. Thus, I tried tricking the system to see this behavior: var ar = new Uint8Array([1,2,3,4,5,6,7,8]); ar.set(ar.subarray(0,6),2); I perceived that, if it started copying from ar at 0, but overwrote values at 2, the subarray would be manipulated, and thus start looping once it reached index 2.

问题 Experimenting with memory pool pre-allocation, I found that allocating a 60M Float32Array makes sometimes crash the browser tab (tried in Chrome): var bigArray = new Float32Array(60000000) for (var i = 0; i < bigArray.length; i+=1) { bigArray[i] = Math.random() } I'm allocating 240MB in total (i.e. Float32Array.BYTES_PER_ELEMENT * bigArray.length) on an 8Gb machine. That makes the tab crash 20% of times, and 100% if I try to inspect bigArray (e.g., try to get bigArray.length in console, log

问题 I'm looking for a semi-general purpose data structure in C# to store arrays of different integer and float types. In some cases, the integers are bit fields where each bit is equally important and loss of precision isn't tolerable. I'm finding this difficult and messy because of the C# type system and my lack of C# fluency. The project: Ethercat periodic packets arrive and are converted to a structure (Packet) and accumulated as Packet[] over the course of an experiment. Each field of Packet

问题 So there is are a lot of examples on how to write an entire pixel from a Uint32Array view of the ImageData object. But is it possible to read an entire pixel without incrementing the counter 4 times? From hacks.mozilla.org, writing an rgba pixels looks like this . var imageData = ctx.getImageData(0, 0, canvasWidth, canvasHeight); var buf = new ArrayBuffer(imageData.data.length); var buf8 = new Uint8ClampedArray(buf); var data = new Uint32Array(buf); for (var y = 0; y < canvasHeight; ++y) {

问题 My question is very similar to this thread, however it was never properly answered. I have an ImageAdapter setup as so; public class ImageAdapter extends BaseAdapter { private Context mContext; int[] mImages; public ImageAdapter(Context c, int[] images) { mContext = c; mImages = images; } @Override public int getCount() { return 0; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int

问题 I am using box2d and attempting to create a chain shape. In order to create a chain shape or polygon shape I must pass an array of vectors in order to specify the geometry. I do not see any documentation to help me accomplish this, and the notes about bindings here don't go into any detail about arrays. How can I construct an array? 回答1: I have solved this problem by using these (as yet undocumented) emscripten features. Note that I am accessing the functions and values (like ALLOC_STACK and