Vosklet/src/pre.js

let objs = [] 
let dStream = new DecompressionStream("gzip")
Module.revokeURLs = () => {
  URL.revokeObjectURL(pthreadUrl)
  URL.revokeObjectURL(processorUrl)
} 
Module.cleanUp = () => {
  objs.forEach(obj => obj.delete())
  Module.revokeURLs()
}
class genericModel extends EventTarget {
  constructor() {
    super()
    objs.push(this)
  }
  static async _init(url, storepath, id, normalMdl) {
    let mdl = new genericModel()
    return new Promise((resolve, reject) => {
      mdl.addEventListener("_continue", (ev) => {
        if(ev.detail === "0") {
          return resolve(mdl)
        }
        mdl.delete()
        reject(ev.detail)
      }, {once : true})
      mdl.addEventListener("_checkMdl", (ev) => {
        switch(ev.detail) {
          case "0":
            mdl.load(true);
            break;
          case "fetch":
            (async () => {
              let res = await fetch(url)
              if(!res.ok) {
                return reject("Unable to download model")
              }
              let wStream = await (await (await navigator.storage.getDirectory()).getFileHandle("m0dEl.tar", {create : true})).createWritable()
              let tarReader = res.body.pipeThrough(dStream).getReader()
              while(true) {
                let readRes = await tarReader.read()
                if(!readRes.done) await wStream.write(readRes.value)
                else break
              }
              await wStream.close()
              mdl.obj.afterFetch()
            })()
            break;
          default:
            reject(ev.detail)
        }
      }, {once : true})
      if(normalMdl) mdl.obj = new Module.model(storepath, id, objs.length-1)
      else mdl.obj = new Module.spkModel(storepath, id, objs.length-1)
      mdl.obj.checkModel()
    })
  }
  delete() {
    if (this.obj) this.obj.delete()
  }
}
Module.makeModel = async (url, storepath, id) => {
  return genericModel._init(url, storepath, id,true)
}
Module.makeSpkModel = async (url, storepath, id) => {
  return genericModel._init(url, storepath, id, false)
}
class Recognizer extends EventTarget {
  constructor() {
    super()
    objs.push(this)
  }
  static async _init(model, sampleRate) {
    let rec = new Recognizer()
    return new Promise((resolve, reject) => {
      rec.addEventListener("_continue", (ev) => {
        if(ev.detail == "0") {
          rec.ptr = Module._malloc(512)
          return resolve(rec)
        }
        rec.delete()
        reject(ev.detail)
      }, {once : true})
      rec.obj = new Module.recognizer(model, sampleRate, objs.length-1)  
    })
  }
  async getNode(ctx, channelIndex = 0) {
    if(typeof this.node === "undefined") {
      let msgChannel = new MessageChannel()
      await ctx.audioWorklet.addModule(processorUrl)
      this.node = new AudioWorkletNode(ctx, 'BRProcessor', { channelCountMode: "max", numberOfInputs: 1, numberOfOutputs: 1, processorOptions: { ptr: this.ptr, channel: channelIndex, recognizerPort: msgChannel.port1 } })
      msgChannel.port1.onmessage = (ev) => {
        this.obj.acceptWaveForm()
      } 
    }
    return this.node
  }
  recognize(buf, channelIndex = 0) {
    Module.HEAPF32.set(buf.getChannelData(channelIndex).subarray(0, 512), this.ptr);
    this.obj.acceptWaveForm()
  }
  delete() {
    if (this.obj) this.obj.delete()
    if(this.node) this.node.postMessage("0")
  }
  setWords(words) {
    this.obj.setWords(words)
  }
  setPartialWords(partialWords) {
    this.obj.setPartialWords(partialWords)
  }
  setGrm(grm) {
    this.obj.setGrm(grm)
  }
  setSpkModel(spkModel) {
    this.obj.setSpkModel(spkModel.obj)
  }
  setNLSML(nlsml) {
    this.obj.setNLSML(nlsml)
  }
  setMaxAlternatives(alts) {
    this.obj.setMaxAlternatives(alts)
  }
}
Module.makeRecognizer = (model, sampleRate) => {
  return Recognizer._init(model.obj, sampleRate)
}
let processorUrl = URL.createObjectURL(new Blob(['(',
  (() => {
    registerProcessor("BRProcessor", class extends AudioWorkletProcessor {
      constructor(options) {
        this.done = false
        this.port.onmessage = (ev) => this.done = true
        this.ptr = options.processorOptions.ptr 
        this.recognizerPort = options.processorOptions.recognizerPort
        this.channelIndex = options.processorOptions.channelIndex
      }
      process(inputs, outputs, params) {
        if(this.done) return false;
        this.wasmMem.set(inputs[0].getChannelData(this.channelIndex));
        this.recognizerPort.postMessage("0") 
        outputs = inputs
        return true
      }
    })
  }).toString()
, ')()'], {type : "text/javascript"}))

// Taken from the worker.js file
let pthreadUrl = URL.createObjectURL(new Blob(['(',
  (() => {
    /**
     * @license
     * Copyright 2015 The Emscripten Authors
     * SPDX-License-Identifier: MIT
     */

    // Pthread Web Worker startup routine:
    // This is the entry point file that is loaded first by each Web Worker
    // that executes pthreads on the Emscripten application.
    'use strict';

    var Module = {};

    // Thread-local guard variable for one-time init of the JS state
    var initializedJS = false;

    function assert(condition, text) {
      if (!condition) abort('Assertion failed: ' + text);
    }
    function threadPrintErr() {
      var text = Array.prototype.slice.call(arguments).join(' ');
      console.error(text);
    }
    function threadAlert() {
      var text = Array.prototype.slice.call(arguments).join(' ');
      postMessage({cmd: 'alert', text, threadId: Module['_pthread_self']()});
    }
    // We don't need out() for now, but may need to add it if we want to use it
    // here. Or, if this code all moves into the main JS, that problem will go
    // away. (For now, adding it here increases code size for no benefit.)
    var out = () => { throw 'out() is not defined in worker.js.'; }
    var err = threadPrintErr;
    self.alert = threadAlert;
    var dbg = threadPrintErr;

    Module['instantiateWasm'] = (info, receiveInstance) => {
      // Instantiate from the module posted from the main thread.
      // We can just use sync instantiation in the worker.
      var module = Module['wasmModule'];
      // We don't need the module anymore; new threads will be spawned from the main thread.
      Module['wasmModule'] = null;
      var instance = new WebAssembly.Instance(module, info);
      // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193,
      // the above line no longer optimizes out down to the following line.
      // When the regression is fixed, we can remove this if/else.
      return receiveInstance(instance);
    }

    // Turn unhandled rejected promises into errors so that the main thread will be
    // notified about them.
    self.onunhandledrejection = (e) => {
      throw e.reason || e;
    };

    function handleMessage(e) {
      try {
        if (e.data.cmd === 'load') { // Preload command that is called once per worker to parse and load the Emscripten code.

        // Until we initialize the runtime, queue up any further incoming messages.
        let messageQueue = [];
        self.onmessage = (e) => messageQueue.push(e);

        // And add a callback for when the runtime is initialized.
        self.startWorker = (instance) => {
          Module = instance;
          // Notify the main thread that this thread has loaded.
          postMessage({ 'cmd': 'loaded' });
          // Process any messages that were queued before the thread was ready.
          for (let msg of messageQueue) {
            handleMessage(msg);
          }
          // Restore the real message handler.
          self.onmessage = handleMessage;
        };

          // Module and memory were sent from main thread
          Module['wasmModule'] = e.data.wasmModule;

          // Use `const` here to ensure that the variable is scoped only to
          // that iteration, allowing safe reference from a closure.
          for (const handler of e.data.handlers) {
            Module[handler] = (...args) => {
              postMessage({ cmd: 'callHandler', handler, args: args });
            }
          }

          Module['wasmMemory'] = e.data.wasmMemory;

          Module['buffer'] = Module['wasmMemory'].buffer;

          Module['workerID'] = e.data.workerID;

          Module['ENVIRONMENT_IS_PTHREAD'] = true;

          if (typeof e.data.urlOrBlob == 'string') {
            if (typeof self.trustedTypes != 'undefined' && self.trustedTypes.createPolicy) {
              var p = self.trustedTypes.createPolicy('emscripten#workerPolicy3', { createScriptURL: (ignored) => e.data.urlOrBlob });
              importScripts(p.createScriptURL('ignored'));
            } else
            importScripts(e.data.urlOrBlob);
          } else {
            var objectUrl = URL.createObjectURL(e.data.urlOrBlob);
            if (typeof self.trustedTypes != 'undefined' && self.trustedTypes.createPolicy) {
              var p = self.trustedTypes.createPolicy('emscripten#workerPolicy3', { createScriptURL: (ignored) => objectUrl });
              importScripts(p.createScriptURL('ignored'));
            } else
            importScripts(objectUrl);
            URL.revokeObjectURL(objectUrl);
          }
          loadBR(Module);
        } else if (e.data.cmd === 'run') {
          // Pass the thread address to wasm to store it for fast access.
          Module['__emscripten_thread_init'](e.data.pthread_ptr, /*is_main=*/0, /*is_runtime=*/0, /*can_block=*/1);

          // Await mailbox notifications with `Atomics.waitAsync` so we can start
          // using the fast `Atomics.notify` notification path.
          Module['__emscripten_thread_mailbox_await'](e.data.pthread_ptr);

          assert(e.data.pthread_ptr);
          // Also call inside JS module to set up the stack frame for this pthread in JS module scope
          Module['establishStackSpace']();
          Module['PThread'].receiveObjectTransfer(e.data);
          Module['PThread'].threadInitTLS();

          if (!initializedJS) {
            // Embind must initialize itself on all threads, as it generates support JS.
            // We only do this once per worker since they get reused
            Module['__embind_initialize_bindings']();
            initializedJS = true;
          }

          try {
            Module['invokeEntryPoint'](e.data.start_routine, e.data.arg);
          } catch(ex) {
            if (ex != 'unwind') {
              // The pthread "crashed".  Do not call `_emscripten_thread_exit` (which
              // would make this thread joinable).  Instead, re-throw the exception
              // and let the top level handler propagate it back to the main thread.
              throw ex;
            }
          }
        } else if (e.data.cmd === 'cancel') { // Main thread is asking for a pthread_cancel() on this thread.
          if (Module['_pthread_self']()) {
            Module['__emscripten_thread_exit'](-1);
          }
        } else if (e.data.target === 'setimmediate') {
          // no-op
        } else if (e.data.cmd === 'checkMailbox') {
          if (initializedJS) {
            Module['checkMailbox']();
          }
        } else if (e.data.cmd) {
          // The received message looks like something that should be handled by this message
          // handler, (since there is a e.data.cmd field present), but is not one of the
          // recognized commands:
          err(`worker.js received unknown command ${e.data.cmd}`);
          err(e.data);
        }
      } catch(ex) {
        err(`worker.js onmessage() captured an uncaught exception: ${ex}`);
        if (ex?.stack) err(ex.stack);
        Module['__emscripten_thread_crashed']?.();
        throw ex;
      }
    };

    self.onmessage = handleMessage;
  }).toString()
, ')()'], {type : "text/javascript"}))