Vst Plugin Gui Design

Posted By admin On 22.12.20
Vst Plugin Gui Design Average ratng: 8,5/10 8912 votes
  • Virtual studio technology (VST) is an audio plug-in software interface that integrates a software synthesizer and effects into digital audio workstations. It uses digital signal processing to simulate a traditional recording studio’s hardware in software. There are both commercial and freeware versions of VST plug-ins.
  • Build VST Plugin soft syntsh and effects using a powerful visual programming language based on classic analog modular synthesis design.

Years ago, I’ve tried to use the GPL version of Qt, but it couldn’t be done without a Qt Solution that was at the time non-free. Now, Nokia has freed and Qt and the appropriate Qt Solution.

I’ve searched if someone has already used this new version to create a VST plugin. The only blog post I’ve found does not use the Qt Solution and is not perfect. According to the documentation what is missing in this solution is precisely what the Solution should do. So let’s try it.

Discover 20+ world-class professional VST/AU music plugins like Serum, Arturia’s V Collection, iZotope’s Ozone, & Presonus’ Studio One DAW. Build VST Plugin soft syntsh and effects using a powerful visual programming language based on classic analog modular synthesis design. It seems like a very amazing plugin, i usually have problems positioning GuiObjects because of the grid so that would be amazing for me. And its so cool that theres a lot of GUI Design features in one plugin, i used to have like 10 plugins for GUI Design that only do one thing but this is amazing! GUI design for synthesizers, VST plugins, DAWs, iOS and Android audio apps by Voger Design. The user interface mimics the original Kawai K1 module, with additional on-screen controls for parameters like envelopes and filters. This combination works quite well in the plugin format. Accessing the presets is easy, and tweaking the Kawai K1 sounds in real-time is fun.

So I’ve download the 2.4 VST SDK as well as Qt 4.5 and the WinMigrate Solution. As I’ll be using Qt with signals and slots, I used SCons to build my small plugin.

Designing the interface and testing it

The interface is really simple: a label with a name, the value of the gain and a slider. Here is what it looks like in Tracktion 3:
The slider takes values from 0 to 99, value that will be displayed in a label. This will be the gain factor in percentage.

Nothing fancy here with the class header:

The panel is created with a link to the actual audio effect (needed in the future) and the parent HWND given by the host.

The actual code is even simplier:

Now this is the class that will be opened by the VST editor this way:

Now, in AGain’s constructor, I can add my custom editor:

Traktor pro 2 release date. So there isn’t anything really fancy, it kind of works out of the box. Unfortunately, it doesn’t work as well as in T3 in every host. I cannot resize the window VSTHost gives to the open() method, even if I tested it with almost all solutions I’ve found on MSDN.

Adding interactivity

Now, I will eventually use the power of Qt. The QtAGain class will be a QObject, as will be the AGain effect. This way, I can connect signals from the GUI to the effect when a parameter is modified by the user, and vice-versa, the UI will be updated when the effect sees a parameter change (indicated by the host for instance).

So I add a connection inside the QVstPanel constructor to a new slot that will update the underlying effect:

The trouble arises from the effect: what should I do if the effect gets a setParameter that didn’t come from the UI? If there is no UI, everything is fine though. So I will add a signal inside QtAgain, the editor, that will forward a signal emitted by AGain only if the UI is up.

So now, the signal that the UI will get is a float, so I can reuse the name update() for my slot:

Of course, you will have several parameters inside your VST plugin, I suggest you use the editor instance to the mapping between the effect and the different slots you may have inside your UI.

Conclusion

Although I couldn’t get it to work with VSTHost (the host widget is not resized), I think the QWinWidget is a good class to help developing Qt VST plugins. I may want to use this skeletton to test some digital effects with a cool UI.

If you have a solution to make VSTHost work, I’m all ears.

The code is available on Launchpad.

Introduction

Microsoft announced that it would offer Visual Studio Express free of charge forever. Though the Express version of Visual C++ (hereafter referred to as VC++) has some limitations, it’s still a great tool and it’s nice to see Microsoft taking some steps to support the developers writing software for their platform. This document will describe how to get VC++ installed and building VST plugins. It assumes that you have prior experience developing VST plugins, and are familiar with the structure and layout of the VST SDK.

If you are trying to write VST’s in a language other than C++, than this guide is not for you. There are lots of other frameworks out there for developing VST plugins in other languages (such as C#, Java, Ruby and Python, just to name a few).

This tutorial will walk you through the process of installing and configuring the tools you’ll need to build your own VST plugins with Visual Studio, and creating a simple VST plugin with optional support for a VSTGUI frontend. This guide only covers building VST 2.x plugins, as the VST3 SDK is not very widely supported yet. Note that Steinberg’s website is a bit confusing and it is easy to accidentally download the wrong version of the SDK, so double-check to make sure that you have the 2.4 SDK.

Download required packages

  1. Steinberg’s VST SDK, which requires you to make a free Steinberg Developer account.
  2. Microsoft’s Visual C++. This guide uses the 2010 Express edition, as it was the latest version at time of writing.
  3. Libpng and zlib (optional)

Install Visual C++

If you already have a working installation of VC++, you can skip this step. Otherwise, download VC++ and install it. The standard installation should be OK, but you can choose to perform a custom installation if you don’t want documentation or other stuff installed with it. Before installing VC++, you must remove any other versions of VC++ on your computer.

Next, download and install the Platform SDK, which will provide you with the standard header files and libraries you’ll need to build software. You may choose to install VC++ anywhere on your hard drive, but the default location is C:Program FilesMicrosoft Visual Studio 10.0.

Creating your project

Create a new project of type “Class Library”, which we’ll call YourProjectName. In the rest of this tutorial, whenever you see YourProjectName, replace that text with the actual name of your project.

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In Visual Studio 9, you’d make a new project with the wizard found at File -> New -> Project. Select Visual C++ -> Win32 Console Application, and choose a directory for your project. When the wizard opens, press “Next” and select DLL as the Application Type. Also check the “Empty Project” box.

If you prefer not to start with an empty project, then you can remove all of the files that VC++ creates for you, but keep the resource.h and YourProjectName.rc files, and remove any references to these files (such as YourProjectName.ico being listed in the resource file).

Add Source Code to the Project

If you already have source code for your plugin, simply add it to the project. Otherwise, you need to create the following files:

  • YourProjectName.cpp
  • YourProjectName.h
  • resource.h (Only needed if building a plugin GUI)
  • YourProjectName.rc (Only needed if building a plugin GUI)

You will also need to add the files from the VST SDK, which includes everything under the vstsdk2.4/public.sdk/source/vst2.x and vstsdk2.4/pluginterfaces/vst2.x directories. I usually prefer to manually make groups for these directories and drag the files to the groups from Explorer, as dragging the entire “vstsdk2.4” directory to VS can cause it to choke when it tries to add a bunch of unused files to the project.

To start out with, the plugin’s entry point header file (YourProjectName.h) should look something like this:

The accompanying class definition (YourProjectName.cpp) should look something like this:

Note that your project won’t compile just yet, but be patient!

The above code samples are simply blank entry points which don’t do anything exciting. The VST SDK offers lots of methods which you can override in order to do things like setting parameters, receiving MIDI messages, and so on. These things are beyond the scope of this tutorial; if you don’t know what code to put inside of processReplacing, try checking out the “again” example distributed within the VST SDK in the public.sdk/samples/vst2.x/again folder.

You must also create a module definition file for your project, named YourProjectName.def. Usually this file is placed in the same directory as the VC++ project file, but you may place it somewhere else so long as this definition matches the Module Definition File settings in the Linker section of the project preferences. This is just a plain-text file which should contain the following text:

Configure build settings

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Go to the project settings either by right clicking on the project in the solution explorer and then selecting “Properties”. Make the following changes to the project for all build configurations:

  • General
    • Character Set: Not Set
    • Common Language Runtime Support: No Common Language Runtime Support
  • C/C++
    • General:
      • Additional Include Directories:
        1. (or wherever you put the VST SDK)
        2. Your source code directory
        3. Any other directories which you may have header files stored in Global SDK directories, such as
    • Preprocessor:
      • Preprocessor Definitions:
      • For Debug builds you may also wish to add
      • If you wish to use PNG graphics for a VSTGUI frontend, add
      • To avoid lots of compiler nags and warnings, define
      • In some cases, you may also need to define
    • Code Generation:
      • Runtime Library: Multi-threaded. Multi-threaded debug may be used for debug builds. This will build the VC++ common runtime library statically into your plugin, increasing its size by approximately 200Kb. If you choose to use the CRL as a dynamic library, then you must also distribute a copy of the CRL with your application, which complicates deployment and distribution.
    • Precompiled Headers:
      • Precompiled Header: Not Using Precompiled Headers. Yeah, this makes rebuilding a bit slower, but will avoid a bunch of weird errors as you are getting your project set up. Once you get the project building you can revisit this step.
  • Linker
    • General:
      • Additional Library Directories: Add any other library directories which your project depends on.
    • Input:
      • Additional Dependencies (for Release builds):
        • libcmt.lib
        • uuid.lib
        • shell32.lib
        • ole32.lib
        • gdi32.lib
        • User32.lib
        • advapi32.lib
        • zlib.lib (only if you are building with a GUI)
        • libpng.lib (only if you are building with a GUI)
      • Additional Dependencies (for Debug builds):
        • shell32.lib
        • msvcrtd.lib
        • ole32.lib
        • gdi32.lib
        • User32.lib
        • advapi32.lib
        • zlib.lib (only if you are building with a GUI)
        • libpng.lib (only if you are building with a GUI)
      • Ignore Specific Default Library (for Release builds):
        • msvcrt.lib
        • libc.lib
        • msvcrtd.lib
        • libcd.lib
        • libcmtd.lib
      • Ignore Specific Default Library (for Debug builds):
        • libcmt.lib
        • libcmtd.lib
        • msvcrt.lib
      • Module Definition File: YourProjectName.def

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Adding support for VSTGUI (optional)

Include VSTGUI support in your plugin, simply add the VSTGUI files into your project in addition to your own editor class. At a very minimum, these are:

  • aeffguieditor.cpp
  • vstcontrols.cpp
  • vstgui.cpp

Adding support for PNG graphics (optional)

If you would like to use PNG’s in your plugin instead of BMP graphics, you will need to also build your own version of libpng and zlib. Download the source code for both libraries from the links given in the “Requirements” section of the document and place them in the same directory. There is a Visual Studio project for libpng which will also build zlib for you; it is located in the projectsvisualc71 directory. In order to get the projects to build correctly, you’ll need to rename the source code directories to simply “libpng” and “zlib”, removing the version numbers from the directory name.

When you open the project up, VC++ will run you through the project conversion wizard. Convert the project, and change the “Runtime Library” settings in both libpng and zlib to be Multi-Threaded, as described above. Unless this step is performed, the dependency on the CLR will be present in your project. Next, choose the LIB ASM Release or LIB Release build style and build the project; if you build the libraries as DLL’s, you will be unable to statically link them into your plugin. The project should build ok, but throw a few errors when attempting to run the pngtest files. You can ignore these problems, as the libraries will still be correctly compiled and can now be linked to your project.

Visual Studio doesn’t need to have the libraries within your actual project. Instead, place the libraries in a directory of your choosing and be sure to add this path to the list of “Additional Library Directories” in the Linker preferences for your project. You may choose to place the libraries in the same directory as the Microsoft Platform SDK stuff, but I personally prefer to keep them in a separate directory checked into version control. Also be sure to add references to libpng.lib and zlib.lib for your project in the “Additional Dependencies” section of your Linker preferences for the project.

The path must be relative to the location of the project file. Then, in resource.h, add the following preprocessor definitions:

Now you can use IDB_BITMAP1 (or any other name of your choosing) in your code when creating new CBitmap objects.

I have heard some reports of vstgui.cpp not compiling properly due to the missing symbol png_set_expand_gray_1_2_4_to_8. Changing png_set_gray_1_2_4_to_8 to png_set_expand_gray_1_2_4_to_8 in vstgui.cpp seems to fix this issue.

Final considerations

VC++ ships with an optimizing compiler, but sometimes the compiler will choke on certain files and optimization must be disabled. In particular, I have experienced this with Laurent de Soras’ FFTReal libraries, since they are written as template classes. In general, however, optimization is a good idea, as is “Eliminating Unreferenced Data” (in the linker settings). The “Whole Program Optimization” setting appears tempting, but usually results in dozens of build errors and problems, so it’s best to avoid this. Also, be sure to use the optimization features of this compiler and linker, as they can greatly boost runtime performance.

If you are developing on a multi-core machine, then you might need to disable parallel builds by setting the number of parallel builds to 1 under Tools -> Options -> Projects and Solutions -> Build and Run. In past verisons of VS, I noticed that the compiler does not always link projects in the order one would expect, which caused odd errors during linking about missing symbols. However, VS2010 users probably shouldn’t need worry about this setting.

Unresolved symbols when linking

Sometimes you may see errors like the following:

If you are getting errors in your build about missing symbols, make sure that you double- and triple-check the debug and release configurations for the library configuration above, since some of the libraries which are used in one build style are specifically excluded from the other. Also, when you close and re-open the project’s build properties, VS always “forgets” the last selected build style, so remember to check and set this appropriately.

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Also, you should check to make sure that the Platform SDK was correctly installed on your system and that your project’s include and library paths are pointing to these directories.

Unresolved external symbols

If you are seeing errors like this:

Then this most likely means that the file which contains the given symbol is not correctly added to the VC++ solution.

Linking errors with symbols defined multiple times

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This is undoubtedly one of the most frustrating problems which can occur when building a VST in VC++. If you are seeing error messages like this, then it most likely means there is some problem with your library configuration:

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Most likely, the libcmt and msvcrt libraries are being included incorrectly in your build. Console emulation vst free. Double-check the library list above, keeping in mind that the recommended configuration uses libcmt for release builds only, and msvcrtd for debug builds only.