ArrayBuffer is a Javascript data type used to represent a generic, fixed-length binary data buffer.
Questions tagged [arraybuffer]
597 questions
7
votes
2 answers
Receiving WebSocket ArrayBuffer data in the browser - receiving string instead
I have a node.js server application and a browser client. Sending ArrayBuffer data browser -> server works perfectly, but server -> browser results in a string "[object ArrayBuffer]" being received. This happens in the latest versions of both Chrome…
svinja
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6
votes
1 answer
When I open a Salesforce Attachment it is downloaded but the pdf is empty
I am getting the attachment body using the Rest API.
var config = {
method: 'get',
url: '/services/data/v48.0/sobjects/Attachment/00PD000000HQD68MAH/Body',
headers: {
…
Chris Blesson
- 99
- 6
6
votes
1 answer
Offset is outside the bounds of the DataView, the debugger shows it is inside the bounds
I get the error Offset is outside the bounds of the DataView for the following code
let data = [...] // some array of Int16
let buf = new ArrayBuffer(data.length);
let dataView = new DataView(buf);
data.forEach((b, i) => {
dataView.setInt16(i,…
Aivan Monceller
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6
votes
1 answer
Javascript Fetch API with multiple ranges request get binary Float32Array data
I am using range request to read many 32 bit float from a large binary file, unfortunately the float I need from this file is at different part of the file, hence I need to do range request with multiple…
Terry
- 533
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- 17
6
votes
3 answers
How to write low-precision numbers (2-10 bits) to an array buffer / blob?
problem: in video-games there are tons of low precision numbers that can be packed together over the network to dramatically save bandwidth compared to sending strings. Strings are allocated to UTF-8 which uses 1 byte for each character.
Ideally…
hydrix
- 332
- 2
- 9
6
votes
1 answer
Convert ArrayBuffer into ImageData for drawing on canvas: optimization
I am streaming video over a WebSocket by sending each frame in the raw ImageData format (4 bytes per pixel in RGBA order). When I receive each frame on the client (as an ArrayBuffer), I want to paint this image directly onto the canvas as…
rvighne
- 20,755
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6
votes
1 answer
Receive an ArrayBuffer on WebSocket (ws)
I would like to handle ArrayBuffer messages received from the client using ws. Client-side, I directly receive an ArrayBuffer thanks to ws.binaryType, but server-side, I don't receive an ArrayBuffer but something like this (string ?) : '< Buffer 00…
zbeyens
- 321
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6
votes
1 answer
Reading/writing/copying an ArrayBuffer into another ArrayBuffer with an offset
Let's say I have an ArrayBuffer which is an mp4 file. I'd like to create a new ArrayBuffer with a few extra bytes to be used as header information, and then store the mp4 buffer in the remainder of the new ArrayBuffer.
// ... assume the `data`…
Nick Jennings
- 3,853
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6
votes
3 answers
store a json object in ArrayBuffer
Want to store a json object in ArrayBuffer
function stringToUint(string) {
var string = btoa(unescape(encodeURIComponent(string))),
charList = string.split(''),
uintArray = [];
for (var i = 0; i < charList.length; i++) {
…
Manish Kumar
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6
votes
2 answers
Javascript: Sending arrayBuffer using XMLHttpRequest
I want to send a multipart form using XMLHttpRequest. The file I want to attach is a jpg file. Appending the file to the FormData object works fine.
But I'd like to process the image file before sending it. Therefore I have a library that takes a…
bebo
- 819
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6
votes
1 answer
Playing raw audio PCM samples in Web Audio
I have an array of sound samples (16-bit):
[0, 120, 320, 120, 0, -100, -30000, 65, 2, 3, 10, ...]
They range -32768 to 32767. I would like to be able to play the samples using the Web Audio API.
I know that it expects the source buffer to be an…
Chris
- 26,544
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6
votes
2 answers
merging / layering multiple ArrayBuffers into one AudioBuffer using Web Audio API
I need to layer looping .wav tracks that ultimately I will need to be able to turn on and off and keep in sync.
First I load the tracks and stopped BufferLoader from turning the loaded arraybuffer into an AudioBuffer (hence the false)
…
samrad
- 132
- 1
- 7
5
votes
2 answers
Shuffling part of an ArrayBuffer in-place
I need to shuffle part of an ArrayBuffer, preferably in-place so no copies are required. For example, if an ArrayBuffer has 10 elements, and I want to shuffle elements 3-7:
// Unshuffled ArrayBuffer of ints numbered 0-9
0, 1, 2, 3, 4, 5, 6, 7, 8,…
Nic Foster
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5
votes
1 answer
Javascript - Converting between Unicode string and ArrayBuffer
Does somebody know a script that is able to convert a string to a ArrayBuffer using unicode encoding?
I´m creating a browser-side eqivalent of the "Buffer" of node.js. The only encoding that is left is unicode. All others are done.
Thanks for your…
Van Coding
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5
votes
4 answers
Efficiently update a canvas with RGB or grayscale data (but not RGBA)
I have a
Basj
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