mirror of https://bitbucket.org/ausocean/av.git
audio-player: added wav encoder for html 5 player
This commit is contained in:
Trek H
parent
000b71068f
commit
9e9ac688c3
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@ -1,3 +1,32 @@
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/*
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NAME
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adpcm.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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/*
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Original IMA/DVI ADPCM specification: (http://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf).
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Reference algorithms for ADPCM compression and decompression are in part 6.
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*/
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const indexTable = [
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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@ -30,6 +59,7 @@ let est = 0, // Estimation of sample based on quantised ADPCM nibble.
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idx = 0, // Index to step used for estimation.
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step = 0;
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// decodeSample takes 4 bits which represents a single ADPCM nibble, and returns a 16 bit decoded PCM sample.
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function decodeSample(nibble) {
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let diff = 0;
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if ((nibble & 4) != 0) {
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@ -61,6 +91,7 @@ function decodeSample(nibble) {
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return result;
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}
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// decode takes an array of bytes of arbitrary length representing adpcm and decodes it into pcm.
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function decode(b) {
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// Initialize Decoder with first 4 bytes of b.
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est = bytesToInt16(b[0], b[1]);
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@ -4,20 +4,34 @@
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<head>
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<meta charset="utf-8">
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<title>Audio Player</title>
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<script type="text/javascript" src="pcm-player.min.js"></script>
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<script type="text/javascript" src="pcm-to-wav.js"></script>
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<script type="text/javascript" src="adpcm.js"></script>
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<script type="text/javascript" src="main.js"></script>
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<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
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integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
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<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
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integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
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<link rel="stylesheet" type="text/css" href="style.css">
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</head>
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<body>
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<div class="jumbotron">
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<div class="container-fluid">
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<input type="file" id="input">
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<body class="d-flex flex-column">
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<div id="page-content">
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<div class="jumbotron">
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<div class="container-fluid">
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<input type="file" id="input">
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</div>
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<div class="container-fluid">
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<audio controls="controls" id="audio">
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Your browser does not support the <code>audio</code> element.
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<source id="source" src="" type="audio/wav" />
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</audio>
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</div>
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</div>
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</div>
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<footer id="sticky-footer" class="footer py-4 bg-dark text-white-50">
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<div class="container text-center">
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<small>©2019 Australian Ocean Laboratory Limited (AusOcean) (<a rel="license"
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href="https://www.ausocean.org/license">License</a>)</small>
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</div>
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</footer>
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</body>
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</html>
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@ -1,81 +0,0 @@
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package main
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import (
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"bytes"
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"reflect"
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"syscall/js"
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"unsafe"
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"bitbucket.org/ausocean/av/codec/adpcm"
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)
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func main() {
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dec := NewDecoder()
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dec.Start()
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}
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// Decoder is a client side adpcm decoder
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type Decoder struct {
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inBuf []uint8
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onImgLoadCb, initMemCb, getDecLenCb js.Func
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console js.Value
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done chan struct{}
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}
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// NewDecoder returns a new instance of decoder
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func NewDecoder() *Decoder {
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return &Decoder{
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console: js.Global().Get("console"),
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done: make(chan struct{}),
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}
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}
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func (s *Decoder) setupOnImgLoadCb() {
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s.onImgLoadCb = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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// reader := bytes.NewReader(s.inBuf)
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//DECODING HAPPENS HERE
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decoded := bytes.NewBuffer(make([]byte, 0, len(s.inBuf)*4))
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dec := adpcm.NewDecoder(decoded)
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dec.Write(s.inBuf)
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s.inBuf = decoded.Bytes()
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return nil
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})
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}
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func (s *Decoder) setupInitMemCb() {
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// The length of the data array buffer is passed.
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// Then the buf slice is initialized to that length.
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// A pointer to that slice is passed back to the browser.
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s.initMemCb = js.FuncOf(func(this js.Value, i []js.Value) interface{} {
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length := i[0].Int()
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s.console.Call("log", "length:", length)
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s.inBuf = make([]uint8, length)
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hdr := (*reflect.SliceHeader)(unsafe.Pointer(&s.inBuf))
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ptr := uintptr(unsafe.Pointer(hdr.Data))
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s.console.Call("log", "ptr:", ptr)
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js.Global().Call("gotMem", ptr)
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return nil
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})
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}
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func (s *Decoder) setupGetDecLenCb() {
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s.getDecLenCb = js.FuncOf(func(this js.Value, i []js.Value) interface{} {
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return len(s.inBuf)
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})
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}
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// Start sets up all the callbacks and waits for the close signal
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// to be sent from the browser.
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func (s *Decoder) Start() {
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s.setupInitMemCb()
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js.Global().Set("initMem", s.initMemCb)
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s.setupOnImgLoadCb()
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js.Global().Set("loadData", s.onImgLoadCb)
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s.setupGetDecLenCb()
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js.Global().Set("getDecLen", s.getDecLenCb)
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<-s.done
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}
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@ -1,3 +1,27 @@
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/*
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NAME
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main.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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window.onload = function () {
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document.getElementById('input').addEventListener('change', function () {
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@ -7,16 +31,24 @@ window.onload = function () {
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reader.onload = event => {
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bytes = new Uint8Array(event.target.result)
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// decode adpcm to pcm
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var decoded = decode(Array.from(bytes))
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console.log("playing file")
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var player = new PCMPlayer({
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encoding: '16bitInt',
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channels: 1,
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sampleRate: 48000,
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flushingTime: 2000
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// convert raw pcm to wav
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var wav = pcmToWav(decoded, 48000, 1, 16);
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// play wav data in player
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const blob = new Blob([Uint8Array.from(wav)], {
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type: 'audio/wav'
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});
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player.feed(Uint8Array.from(decoded))
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const url = URL.createObjectURL(blob);
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const audio = document.getElementById('audio');
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const source = document.getElementById('source');
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source.src = url;
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audio.load();
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audio.play();
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}
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reader.onerror = error => reject(error)
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reader.readAsArrayBuffer(input)
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@ -1 +0,0 @@
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function PCMPlayer(t){this.init(t)}PCMPlayer.prototype.init=function(t){this.option=Object.assign({},{encoding:"16bitInt",channels:1,sampleRate:8e3,flushingTime:1e3},t),this.samples=new Float32Array,this.flush=this.flush.bind(this),this.interval=setInterval(this.flush,this.option.flushingTime),this.maxValue=this.getMaxValue(),this.typedArray=this.getTypedArray(),this.createContext()},PCMPlayer.prototype.getMaxValue=function(){var t={"8bitInt":128,"16bitInt":32768,"32bitInt":2147483648,"32bitFloat":1};return t[this.option.encoding]?t[this.option.encoding]:t["16bitInt"]},PCMPlayer.prototype.getTypedArray=function(){var t={"8bitInt":Int8Array,"16bitInt":Int16Array,"32bitInt":Int32Array,"32bitFloat":Float32Array};return t[this.option.encoding]?t[this.option.encoding]:t["16bitInt"]},PCMPlayer.prototype.createContext=function(){this.audioCtx=new(window.AudioContext||window.webkitAudioContext),this.gainNode=this.audioCtx.createGain(),this.gainNode.gain.value=1,this.gainNode.connect(this.audioCtx.destination),this.startTime=this.audioCtx.currentTime},PCMPlayer.prototype.isTypedArray=function(t){return t.byteLength&&t.buffer&&t.buffer.constructor==ArrayBuffer},PCMPlayer.prototype.feed=function(t){if(this.isTypedArray(t)){t=this.getFormatedValue(t);var e=new Float32Array(this.samples.length+t.length);e.set(this.samples,0),e.set(t,this.samples.length),this.samples=e}},PCMPlayer.prototype.getFormatedValue=function(t){t=new this.typedArray(t.buffer);var e,i=new Float32Array(t.length);for(e=0;e<t.length;e++)i[e]=t[e]/this.maxValue;return i},PCMPlayer.prototype.volume=function(t){this.gainNode.gain.value=t},PCMPlayer.prototype.destroy=function(){this.interval&&clearInterval(this.interval),this.samples=null,this.audioCtx.close(),this.audioCtx=null},PCMPlayer.prototype.flush=function(){if(this.samples.length){var t,e,i,n,a,s=this.audioCtx.createBufferSource(),r=this.samples.length/this.option.channels,o=this.audioCtx.createBuffer(this.option.channels,r,this.option.sampleRate);for(e=0;e<this.option.channels;e++)for(t=o.getChannelData(e),i=e,a=50,n=0;n<r;n++)t[n]=this.samples[i],n<50&&(t[n]=t[n]*n/50),r-51<=n&&(t[n]=t[n]*a--/50),i+=this.option.channels;this.startTime<this.audioCtx.currentTime&&(this.startTime=this.audioCtx.currentTime),console.log("start vs current "+this.startTime+" vs "+this.audioCtx.currentTime+" duration: "+o.duration),s.buffer=o,s.connect(this.gainNode),s.start(this.startTime),this.startTime+=o.duration,this.samples=new Float32Array}};
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@ -0,0 +1,64 @@
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/*
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NAME
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pcm-to-wav.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
|
||||
option) any later version.
|
||||
|
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It is distributed in the hope that it will be useful, but WITHOUT
|
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
for more details.
|
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|
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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// pcmToWav takes raw pcm data along with the sample rate, number of channels and bit-depth,
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// and adds a WAV header to it so that it can be read and played by common players.
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// input and output data bytes are represented as arrays of 8 bit integers.
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// WAV spec.: http://soundfile.sapp.org/doc/WaveFormat/
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function pcmToWav(data, rate, channels, bitdepth) {
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subChunk2ID = [100, 97, 116, 97]; // "data"
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subChunk2Size = int32ToBytes(data.length);
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subChunk1ID = [102, 109, 116, 32]; // "fmt "
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subChunk1Size = int32ToBytes(16);
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audioFmt = int16ToBytes(1); // 1 = PCM
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numChannels = int16ToBytes(channels);
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sampleRate = int32ToBytes(rate);
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byteRate = int32ToBytes(rate * channels * bitdepth / 8);
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blockAlign = int16ToBytes(channels * bitdepth / 8);
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bitsPerSample = int16ToBytes(bitdepth)
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chunkID = [82, 73, 70, 70]; // "RIFF"
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chunkSize = int32ToBytes(36 + data.length);
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format = [87, 65, 86, 69]; // "WAVE"
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result = chunkID;
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result.push(...chunkSize, ...format, ...subChunk1ID, ...subChunk1Size, ...audioFmt, ...numChannels, ...sampleRate, ...byteRate, ...blockAlign, ...bitsPerSample, ...subChunk2ID, ...subChunk2Size);
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return result.concat(data);
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}
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// int32ToBytes takes a number assumed to be an int 32 and converts it to an array containing bytes (Little Endian).
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function int32ToBytes(num) {
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return [
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(num & 0x000000ff),
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(num & 0x0000ff00) >> 8,
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(num & 0x00ff0000) >> 16,
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(num & 0xff000000) >> 24
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];
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}
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// int16ToBytes takes a number assumed to be an int 16 and converts it to an array containing bytes (Little Endian).
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function int16ToBytes(num) {
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return [(num & 0x00ff), (num & 0xff00) >> 8];
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}
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@ -1,465 +0,0 @@
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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(() => {
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if (typeof global !== "undefined") {
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// global already exists
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} else if (typeof window !== "undefined") {
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window.global = window;
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} else if (typeof self !== "undefined") {
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self.global = self;
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} else {
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throw new Error("cannot export Go (neither global, window nor self is defined)");
|
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}
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// Map web browser API and Node.js API to a single common API (preferring web standards over Node.js API).
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const isNodeJS = global.process && global.process.title === "node";
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if (isNodeJS) {
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global.require = require;
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global.fs = require("fs");
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const nodeCrypto = require("crypto");
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global.crypto = {
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getRandomValues(b) {
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nodeCrypto.randomFillSync(b);
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},
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};
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global.performance = {
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now() {
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const [sec, nsec] = process.hrtime();
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return sec * 1000 + nsec / 1000000;
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},
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};
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|
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const util = require("util");
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global.TextEncoder = util.TextEncoder;
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global.TextDecoder = util.TextDecoder;
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} else {
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let outputBuf = "";
|
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global.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substr(0, nl));
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outputBuf = outputBuf.substr(nl + 1);
|
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}
|
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return buf.length;
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},
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write(fd, buf, offset, length, position, callback) {
|
||||
if (offset !== 0 || length !== buf.length || position !== null) {
|
||||
throw new Error("not implemented");
|
||||
}
|
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const n = this.writeSync(fd, buf);
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callback(null, n);
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||||
},
|
||||
open(path, flags, mode, callback) {
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const err = new Error("not implemented");
|
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err.code = "ENOSYS";
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callback(err);
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||||
},
|
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read(fd, buffer, offset, length, position, callback) {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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callback(err);
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||||
},
|
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fsync(fd, callback) {
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callback(null);
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},
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};
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}
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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|
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global.Go = class {
|
||||
constructor() {
|
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this.argv = ["js"];
|
||||
this.env = {};
|
||||
this.exit = (code) => {
|
||||
if (code !== 0) {
|
||||
console.warn("exit code:", code);
|
||||
}
|
||||
};
|
||||
this._exitPromise = new Promise((resolve) => {
|
||||
this._resolveExitPromise = resolve;
|
||||
});
|
||||
this._pendingEvent = null;
|
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this._scheduledTimeouts = new Map();
|
||||
this._nextCallbackTimeoutID = 1;
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|
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const mem = () => {
|
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// The buffer may change when requesting more memory.
|
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return new DataView(this._inst.exports.mem.buffer);
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}
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const setInt64 = (addr, v) => {
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mem().setUint32(addr + 0, v, true);
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mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
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}
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const getInt64 = (addr) => {
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const low = mem().getUint32(addr + 0, true);
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const high = mem().getInt32(addr + 4, true);
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return low + high * 4294967296;
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}
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const loadValue = (addr) => {
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const f = mem().getFloat64(addr, true);
|
||||
if (f === 0) {
|
||||
return undefined;
|
||||
}
|
||||
if (!isNaN(f)) {
|
||||
return f;
|
||||
}
|
||||
|
||||
const id = mem().getUint32(addr, true);
|
||||
return this._values[id];
|
||||
}
|
||||
|
||||
const storeValue = (addr, v) => {
|
||||
const nanHead = 0x7FF80000;
|
||||
|
||||
if (typeof v === "number") {
|
||||
if (isNaN(v)) {
|
||||
mem().setUint32(addr + 4, nanHead, true);
|
||||
mem().setUint32(addr, 0, true);
|
||||
return;
|
||||
}
|
||||
if (v === 0) {
|
||||
mem().setUint32(addr + 4, nanHead, true);
|
||||
mem().setUint32(addr, 1, true);
|
||||
return;
|
||||
}
|
||||
mem().setFloat64(addr, v, true);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (v) {
|
||||
case undefined:
|
||||
mem().setFloat64(addr, 0, true);
|
||||
return;
|
||||
case null:
|
||||
mem().setUint32(addr + 4, nanHead, true);
|
||||
mem().setUint32(addr, 2, true);
|
||||
return;
|
||||
case true:
|
||||
mem().setUint32(addr + 4, nanHead, true);
|
||||
mem().setUint32(addr, 3, true);
|
||||
return;
|
||||
case false:
|
||||
mem().setUint32(addr + 4, nanHead, true);
|
||||
mem().setUint32(addr, 4, true);
|
||||
return;
|
||||
}
|
||||
|
||||
let ref = this._refs.get(v);
|
||||
if (ref === undefined) {
|
||||
ref = this._values.length;
|
||||
this._values.push(v);
|
||||
this._refs.set(v, ref);
|
||||
}
|
||||
let typeFlag = 0;
|
||||
switch (typeof v) {
|
||||
case "string":
|
||||
typeFlag = 1;
|
||||
break;
|
||||
case "symbol":
|
||||
typeFlag = 2;
|
||||
break;
|
||||
case "function":
|
||||
typeFlag = 3;
|
||||
break;
|
||||
}
|
||||
mem().setUint32(addr + 4, nanHead | typeFlag, true);
|
||||
mem().setUint32(addr, ref, true);
|
||||
}
|
||||
|
||||
const loadSlice = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
|
||||
}
|
||||
|
||||
const loadSliceOfValues = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
const a = new Array(len);
|
||||
for (let i = 0; i < len; i++) {
|
||||
a[i] = loadValue(array + i * 8);
|
||||
}
|
||||
return a;
|
||||
}
|
||||
|
||||
const loadString = (addr) => {
|
||||
const saddr = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
|
||||
}
|
||||
|
||||
const timeOrigin = Date.now() - performance.now();
|
||||
this.importObject = {
|
||||
go: {
|
||||
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
|
||||
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
|
||||
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
|
||||
// This changes the SP, thus we have to update the SP used by the imported function.
|
||||
|
||||
// func wasmExit(code int32)
|
||||
"runtime.wasmExit": (sp) => {
|
||||
const code = mem().getInt32(sp + 8, true);
|
||||
this.exited = true;
|
||||
delete this._inst;
|
||||
delete this._values;
|
||||
delete this._refs;
|
||||
this.exit(code);
|
||||
},
|
||||
|
||||
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
|
||||
"runtime.wasmWrite": (sp) => {
|
||||
const fd = getInt64(sp + 8);
|
||||
const p = getInt64(sp + 16);
|
||||
const n = mem().getInt32(sp + 24, true);
|
||||
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
|
||||
},
|
||||
|
||||
// func nanotime() int64
|
||||
"runtime.nanotime": (sp) => {
|
||||
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
|
||||
},
|
||||
|
||||
// func walltime() (sec int64, nsec int32)
|
||||
"runtime.walltime": (sp) => {
|
||||
const msec = (new Date).getTime();
|
||||
setInt64(sp + 8, msec / 1000);
|
||||
mem().setInt32(sp + 16, (msec % 1000) * 1000000, true);
|
||||
},
|
||||
|
||||
// func scheduleTimeoutEvent(delay int64) int32
|
||||
"runtime.scheduleTimeoutEvent": (sp) => {
|
||||
const id = this._nextCallbackTimeoutID;
|
||||
this._nextCallbackTimeoutID++;
|
||||
this._scheduledTimeouts.set(id, setTimeout(
|
||||
() => { this._resume(); },
|
||||
getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
|
||||
));
|
||||
mem().setInt32(sp + 16, id, true);
|
||||
},
|
||||
|
||||
// func clearTimeoutEvent(id int32)
|
||||
"runtime.clearTimeoutEvent": (sp) => {
|
||||
const id = mem().getInt32(sp + 8, true);
|
||||
clearTimeout(this._scheduledTimeouts.get(id));
|
||||
this._scheduledTimeouts.delete(id);
|
||||
},
|
||||
|
||||
// func getRandomData(r []byte)
|
||||
"runtime.getRandomData": (sp) => {
|
||||
crypto.getRandomValues(loadSlice(sp + 8));
|
||||
},
|
||||
|
||||
// func stringVal(value string) ref
|
||||
"syscall/js.stringVal": (sp) => {
|
||||
storeValue(sp + 24, loadString(sp + 8));
|
||||
},
|
||||
|
||||
// func valueGet(v ref, p string) ref
|
||||
"syscall/js.valueGet": (sp) => {
|
||||
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 32, result);
|
||||
},
|
||||
|
||||
// func valueSet(v ref, p string, x ref)
|
||||
"syscall/js.valueSet": (sp) => {
|
||||
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
|
||||
},
|
||||
|
||||
// func valueIndex(v ref, i int) ref
|
||||
"syscall/js.valueIndex": (sp) => {
|
||||
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
|
||||
},
|
||||
|
||||
// valueSetIndex(v ref, i int, x ref)
|
||||
"syscall/js.valueSetIndex": (sp) => {
|
||||
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
|
||||
},
|
||||
|
||||
// func valueCall(v ref, m string, args []ref) (ref, bool)
|
||||
"syscall/js.valueCall": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const m = Reflect.get(v, loadString(sp + 16));
|
||||
const args = loadSliceOfValues(sp + 32);
|
||||
const result = Reflect.apply(m, v, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 56, result);
|
||||
mem().setUint8(sp + 64, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 56, err);
|
||||
mem().setUint8(sp + 64, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueInvoke(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueInvoke": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.apply(v, undefined, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
mem().setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 40, err);
|
||||
mem().setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueNew(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueNew": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.construct(v, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
mem().setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 40, err);
|
||||
mem().setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueLength(v ref) int
|
||||
"syscall/js.valueLength": (sp) => {
|
||||
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
||||
},
|
||||
|
||||
// valuePrepareString(v ref) (ref, int)
|
||||
"syscall/js.valuePrepareString": (sp) => {
|
||||
const str = encoder.encode(String(loadValue(sp + 8)));
|
||||
storeValue(sp + 16, str);
|
||||
setInt64(sp + 24, str.length);
|
||||
},
|
||||
|
||||
// valueLoadString(v ref, b []byte)
|
||||
"syscall/js.valueLoadString": (sp) => {
|
||||
const str = loadValue(sp + 8);
|
||||
loadSlice(sp + 16).set(str);
|
||||
},
|
||||
|
||||
// func valueInstanceOf(v ref, t ref) bool
|
||||
"syscall/js.valueInstanceOf": (sp) => {
|
||||
mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
|
||||
},
|
||||
|
||||
"debug": (value) => {
|
||||
console.log(value);
|
||||
},
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
async run(instance) {
|
||||
this._inst = instance;
|
||||
this._values = [ // TODO: garbage collection
|
||||
NaN,
|
||||
0,
|
||||
null,
|
||||
true,
|
||||
false,
|
||||
global,
|
||||
this._inst.exports.mem,
|
||||
this,
|
||||
];
|
||||
this._refs = new Map();
|
||||
this.exited = false;
|
||||
|
||||
const mem = new DataView(this._inst.exports.mem.buffer)
|
||||
|
||||
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
||||
let offset = 4096;
|
||||
|
||||
const strPtr = (str) => {
|
||||
let ptr = offset;
|
||||
new Uint8Array(mem.buffer, offset, str.length + 1).set(encoder.encode(str + "\0"));
|
||||
offset += str.length + (8 - (str.length % 8));
|
||||
return ptr;
|
||||
};
|
||||
|
||||
const argc = this.argv.length;
|
||||
|
||||
const argvPtrs = [];
|
||||
this.argv.forEach((arg) => {
|
||||
argvPtrs.push(strPtr(arg));
|
||||
});
|
||||
|
||||
const keys = Object.keys(this.env).sort();
|
||||
argvPtrs.push(keys.length);
|
||||
keys.forEach((key) => {
|
||||
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
||||
});
|
||||
|
||||
const argv = offset;
|
||||
argvPtrs.forEach((ptr) => {
|
||||
mem.setUint32(offset, ptr, true);
|
||||
mem.setUint32(offset + 4, 0, true);
|
||||
offset += 8;
|
||||
});
|
||||
|
||||
this._inst.exports.run(argc, argv);
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
await this._exitPromise;
|
||||
}
|
||||
|
||||
_resume() {
|
||||
if (this.exited) {
|
||||
throw new Error("Go program has already exited");
|
||||
}
|
||||
this._inst.exports.resume();
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
}
|
||||
|
||||
_makeFuncWrapper(id) {
|
||||
const go = this;
|
||||
return function () {
|
||||
const event = { id: id, this: this, args: arguments };
|
||||
go._pendingEvent = event;
|
||||
go._resume();
|
||||
return event.result;
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
if (isNodeJS) {
|
||||
if (process.argv.length < 3) {
|
||||
process.stderr.write("usage: go_js_wasm_exec [wasm binary] [arguments]\n");
|
||||
process.exit(1);
|
||||
}
|
||||
|
||||
const go = new Go();
|
||||
go.argv = process.argv.slice(2);
|
||||
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
|
||||
go.exit = process.exit;
|
||||
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
||||
process.on("exit", (code) => { // Node.js exits if no event handler is pending
|
||||
if (code === 0 && !go.exited) {
|
||||
// deadlock, make Go print error and stack traces
|
||||
go._pendingEvent = { id: 0 };
|
||||
go._resume();
|
||||
}
|
||||
});
|
||||
return go.run(result.instance);
|
||||
}).catch((err) => {
|
||||
throw err;
|
||||
});
|
||||
}
|
||||
})();
|
||||
Loading…
Reference in New Issue