public bool ProcessOffline(String waveInputFilePath, String waveOutputFilePath, String pluginPath, String fxpFilePath = null, float volume = 1.0f) { var wavFileReader = new WaveFileReader(waveInputFilePath); // reuse if batch processing bool doUpdateVstPlugin = false; if (_pluginPath != null) { if (_pluginPath.Equals(pluginPath)) { // plugin has not changed } else { // plugin has changed! doUpdateVstPlugin = true; } } else { _pluginPath = pluginPath; doUpdateVstPlugin = true; } if (doUpdateVstPlugin) { var hcs = new HostCommandStub(); hcs.Directory = Path.GetDirectoryName(pluginPath); vst = new VST(); try { vst.PluginContext = VstPluginContext.Create(pluginPath, hcs); if (vst.PluginContext == null) { Console.Out.WriteLine("Could not open up the plugin specified by {0}!", pluginPath); return(false); } // plugin does not support processing audio if ((vst.PluginContext.PluginInfo.Flags & VstPluginFlags.CanReplacing) == 0) { Console.Out.WriteLine("This plugin does not process any audio."); return(false); } // check if the plugin supports offline proccesing if (vst.PluginContext.PluginCommandStub.CanDo(VstCanDoHelper.ToString(VstPluginCanDo.Offline)) == VstCanDoResult.No) { Console.Out.WriteLine("This plugin does not support offline processing."); Console.Out.WriteLine("Try use realtime (-play) instead!"); return(false); } // add custom data to the context vst.PluginContext.Set("PluginPath", pluginPath); vst.PluginContext.Set("HostCmdStub", hcs); // actually open the plugin itself vst.PluginContext.PluginCommandStub.Open(); Console.Out.WriteLine("Enabling the audio output on the VST!"); vst.PluginContext.PluginCommandStub.MainsChanged(true); // setup the VSTStream vstStream = new VSTStream(); vstStream.ProcessCalled += vst_ProcessCalled; vstStream.PlayingStarted += vst_PlayingStarted; vstStream.PlayingStopped += vst_PlayingStopped; vstStream.pluginContext = vst.PluginContext; vstStream.SetWaveFormat(wavFileReader.WaveFormat.SampleRate, wavFileReader.WaveFormat.Channels); } catch (Exception ex) { Console.Out.WriteLine("Could not load VST! ({0})", ex.Message); return(false); } } if (File.Exists(fxpFilePath)) { vst.LoadFXP(fxpFilePath); } else { Console.Out.WriteLine("Could not find preset file (fxp|fxb) ({0})", fxpFilePath); } // each float is 4 bytes var buffer = new byte[512 * 4]; using (var ms = new MemoryStream()) { vstStream.SetInputWave(waveInputFilePath, volume); vstStream.DoProcess = true; // wait a little while Thread.Sleep(1000); // keep on reading until it stops playing. while (!stoppedPlaying) { int read = vstStream.Read(buffer, 0, buffer.Length); if (read <= 0) { break; } ms.Write(buffer, 0, read); } // save using (WaveStream ws = new RawSourceWaveStream(ms, vstStream.WaveFormat)) { ws.Position = 0; WaveFileWriter.CreateWaveFile(waveOutputFilePath, ws); } } // reset the input wave file vstStream.DoProcess = false; vstStream.DisposeInputWave(); // reset if calling this method multiple times stoppedPlaying = false; return(true); }