Method start

wasm/browser/src/mains/spn.main.js:164–214

()

  }

  async start() {
    if (!this.csoundApi) {
      console.error("starting csound failed because csound instance wasn't created");
      return;
    }

    if (this.currentPlayState !== "realtimePerformanceStarted") {
      this.result = 0;
      this.csoundApi.csoundSetOption(this.csoundInstance, "-odac");
      this.csoundApi.csoundSetOption(this.csoundInstance, "-iadc");
      this.csoundApi.csoundSetOption(this.csoundInstance, "--sample-rate=" + this.sampleRate);
      this.nchnls = -1;
      this.nchnls_i = -1;

      const ksmps = this.csoundApi.csoundGetKsmps(this.csoundInstance);
      this.ksmps = ksmps;
      this.cnt = ksmps;

      this.nchnls = this.csoundApi.csoundGetNchnls(this.csoundInstance);
      this.nchnls_i = this.csoundApi.csoundGetNchnlsInput(this.csoundInstance);

      const outputPointer = this.csoundApi.csoundGetSpout(this.csoundInstance);
      this.csoundOutputBuffer = new Float64Array(
        this.wasm.wasi.memory.buffer,
        outputPointer,
        ksmps * this.nchnls,
      );

      const inputPointer = this.csoundApi.csoundGetSpin(this.csoundInstance);
      this.csoundInputBuffer = new Float64Array(
        this.wasm.wasi.memory.buffer,
        inputPointer,
        ksmps * this.nchnls_i,
      );
      this.zerodBFS = this.csoundApi.csoundGet0dBFS(this.csoundInstance);

      this.publicEvents.triggerOnAudioNodeCreated(this.spn);
      this.eventPromises.createStartPromise();

      const startResult = this.csoundApi.csoundStart(this.csoundInstance);
      if (this.csoundApi._isRequestingRtMidiInput(this.csoundInstance)) {
        requestMidi({
          onMidiMessage: ({ data: event }) =>
            this.csoundApi.csoundPushMidiMessage(this.csoundInstance, event[0], event[1], event[2]),
        });
      }
      this.running = true;
      await this.eventPromises.waitForStart();
      return startResult;
    }
  }

  async initialize({ wasmDataURI, withPlugins, autoConnect }) {
    if (!this.plugins && withPlugins && !isEmpty(withPlugins)) {