uint8array

React Native. MP3 Binary String (Uint8Array(9549)) to stream or file

由 ￡可爱￡侵袭症＋ 提交于 2019-12-22 14:59:48
问题 I am trying to play an audio file with binary string format that Amazon Polly returns. For that, I am using 'react-native-fetch-blob' and reading a stream, but just keep getting errors from the bridge saying 'Invalid data message - all must be length: 8'. It happens when I try to open the stream: ifstream.open() This is the code: //polly config const params = { LexiconNames: [], OutputFormat: "mp3", SampleRate: "8000", Text: "All Gaul is divided into three parts", TextType: "text", VoiceId:

Manipulate RGBA Javascript

由 风格不统一 提交于 2019-12-11 16:48:33
问题 In Javascript i have a Uint8Array() RGBA of image, here is console.log of this : Here is image with rgba array as a string in HTML: Is that possible to manipulate this array, to ex. change colors? Thanks for help! 回答1: Here's a JS algorithm of plotting a pixel to this kind of array: function changeColor(x, y, c) { colorArray[(x * 4) + (y * (imageWidth * 4))] = c.r; colorArray[(x * 4) + (y * (imageWidth * 4)) + 1] = c.g; colorArray[(x * 4) + (y * (imageWidth * 4)) + 2] = c.b; colorArray[(x * 4

How to convert UInt16 to UInt8 in Swift 3?

由 ⅰ亾dé卋堺 提交于 2019-12-11 08:54:08
问题 I want to convert UInt16 to UInt8 array, but am getting the following error message: 'init' is unavailable: use 'withMemoryRebound(to:capacity:_)' to temporarily view memory as another layout-compatible type. The code: let statusByte: UInt8 = UInt8(status) let lenghtByte: UInt16 = UInt16(passwordBytes.count) var bigEndian = lenghtByte.bigEndian let bytePtr = withUnsafePointer(to: &bigEndian) { UnsafeBufferPointer<UInt8>(start: UnsafePointer($0), count: MemoryLayout.size(ofValue: bigEndian)) }

React Native. MP3 Binary String (Uint8Array(9549)) to stream or file

由 偶尔善良 提交于 2019-12-06 04:44:21
I am trying to play an audio file with binary string format that Amazon Polly returns. For that, I am using 'react-native-fetch-blob' and reading a stream, but just keep getting errors from the bridge saying 'Invalid data message - all must be length: 8'. It happens when I try to open the stream: ifstream.open() This is the code: //polly config const params = { LexiconNames: [], OutputFormat: "mp3", SampleRate: "8000", Text: "All Gaul is divided into three parts", TextType: "text", VoiceId: "Joanna" }; Polly.synthesizeSpeech(params, function(err, data) { let _data = ""; RNFetchBlob.fs

Why is Blob of Array smaller than Blob of Uint8Array?

由 两盒软妹~` 提交于 2019-12-02 07:45:20
问题 I read a file using FileReader.readAsArrayBuffer and then do something like this: var compressedData = pako.gzip(new Uint8Array(this.result)); var blob1 = new Blob([compressedData]); // size = 1455338 bytes var blob2 = new Blob(compressedData); // size = 3761329 bytes As an example: if result has 4194304 bytes, after compression it will be size 1455338 bytes. But for some reason the Uint8Array needs to be wrapped in an Array. Why is this? 回答1: Cf. documentation for BLOB constructor: https:/

Why is Blob of Array smaller than Blob of Uint8Array?

由 可紊 提交于 2019-12-02 04:06:50
I read a file using FileReader.readAsArrayBuffer and then do something like this: var compressedData = pako.gzip(new Uint8Array(this.result)); var blob1 = new Blob([compressedData]); // size = 1455338 bytes var blob2 = new Blob(compressedData); // size = 3761329 bytes As an example: if result has 4194304 bytes, after compression it will be size 1455338 bytes. But for some reason the Uint8Array needs to be wrapped in an Array. Why is this? Cf. documentation for BLOB constructor: https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob [the first argument] is an Array of ArrayBuffer,
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