uint8array

问题 I understand this question is oddly phrased, so let me explain with 2 examples. Example 1 The code below turns the series of values [64, 176, 0, 86, 68, 97, 136, 8] into the float 4096.336980910979 . (new DataView(new Uint8Array([64, 176, 0, 86, 68, 97, 136, 8]).buffer)).getFloat64(); /*Output 4096.336980910979*/ How do I reverse it to get the series of values [64, 176, 0, 86, 68, 97, 136, 8] when I input the float 4096.336980910979 ? Example 2: The code below turns the series of values [70,

问题 I have an arraybuffer and I want to get double values.For example from [64, -124, 12, 0, 0, 0, 0, 0] I would get 641.5 Any ideas? 回答1: You could adapt the excellent answer of T.J. Crowder and use DataView#setUint8 for the given bytes. var data = [64, -124, 12, 0, 0, 0, 0, 0]; // Create a buffer var buf = new ArrayBuffer(8); // Create a data view of it var view = new DataView(buf); // set bytes data.forEach(function (b, i) { view.setUint8(i, b); }); // Read the bits as a float/native 64-bit

问题 Please Help I know that you are reading this, and I would appreciate a comment if do not have an answer because I feel that I am alone in trying to figure this out. How Does this Work? I have thoroughly read this document. It mentions an element called TimestampScale. I have downloaded probably thirty WebM example files and seen that the values following the HEX { 0x2AD7B1 or 2A D7 B1 or ['2A','D7','B1'] } or NON-HEX integers { 42 215 177 or [42, 215, 177] } are always the same: HEX {

问题 I have a function which downloads an image, and saves the image data. Based on user preference, it can save the image data in one of two ways - as an ImageData Uint8ClampedArray, or as an ImageBitmap. I'm using an image loading function to wait until the image is loaded before running my save function: function loadImage(src) { return new Promise((resolve, reject) => { const img = new Image(); img.crossOrigin = '*'; img.addEventListener('load', () => resolve(img)); img.src = src; }); } The

问题 How to convert Data to array of UInt8? func serialPort(_ serialPort: ORSSerialPort, didReceive data: Data) { print("recieved:\(data)") let arr: [UInt8] = Data(???)??? } log recieved:70 bytes 回答1: In Swift 3, Data works as a Collection of UInt8 , so you can simply use Array.init . var received: [UInt8] = [] func serialPort(_ serialPort: ORSSerialPort, didReceive data: Data) { print("received:\(data))") received = Array(data) } But, Array.init (or Array.append(contentsOf:) ) copies the content

问题 I did this code to get an image from firestore and use it as an icon for a Map Marker. final StorageReference storageReference = FirebaseStorage().ref().child("ProfilePictures/" + widget.userId); String avatarDownloadPath = await storageReference.getDownloadURL(); final File _avatar = await DefaultCacheManager().getSingleFile(avatarDownloadPath); Uint8List __avatar = await _avatar.readAsBytes(); BitmapDescriptor avatar = BitmapDescriptor.fromBytes(__avatar); setState(() { _markers.add(Marker

问题 I did this code to get an image from firestore and use it as an icon for a Map Marker. final StorageReference storageReference = FirebaseStorage().ref().child("ProfilePictures/" + widget.userId); String avatarDownloadPath = await storageReference.getDownloadURL(); final File _avatar = await DefaultCacheManager().getSingleFile(avatarDownloadPath); Uint8List __avatar = await _avatar.readAsBytes(); BitmapDescriptor avatar = BitmapDescriptor.fromBytes(__avatar); setState(() { _markers.add(Marker

问题 Here is my JS code : UTIF._imgLoaded = function(e) { var page = UTIF.decode(e.target.response)[0], rgba = UTIF.toRGBA8(page), w=page.width, h=page.height; var string = rgba.join(); console.log("rgba : ", rgba); var ind = UTIF._xhrs.indexOf(e.target), img = UTIF._imgs[ind]; UTIF._xhrs.splice(ind,1); UTIF._imgs.splice(ind,1); var cnv = document.createElement("canvas"); cnv.width=w; cnv.height=h; var ctx = cnv.getContext("2d"), imgd = ctx.createImageData(w,h); for(var i=0; i<rgba.length; i++)

问题 I have a Float32Array with values from an audio file.I want to save it as a .wav file so I need to convert that values to a Uint8array. To convert from uint8 to float I convert first to an int16 array and then to a Float32Array (Convert int16 array to float) How can I do that conversion in the other direction? 回答1: You can convert to an ArrayBuffer , copy the data into and then create a byte view of this buffer : var data = new Float32Array([0.1, 0.2, 0.3]); var buffer = new ArrayBuffer(data

问题 I have an array of bytes from an audio file and I want to convert it into data that I can process to filter the audio signal. I have an array like this: [239,246,96,247.....]; Each element is a uint8 byte Each 2 bytes(16 bits) represent a sample,so I converted this array into a int16 element array. How can I then convert this array into a signal with values in the range[-1,1]? 回答1: You already have your signed int16's so you just have to divide by the min and max int16 value respective to the