Starting Vst 2.4 Plugin Support
What's covered
- A VST Plug-in is not an application. It needs a host application that handles the audio streams and makes use of the process the VST plug-in supplies. Generally speaking, it can take a stream of audio data, apply a process to the audio and send the result back the host application. A VST Plug-in performs its process normally using the processor.
- And finally, The VST 2.x Plug-in; The focus of this article is on that last filter, which has the most potential to improve your audio. But it is a fair bit more complicated than the standard filters. VST stands for “Virtual Studio Technology,” and is a piece of software that runs alongside OBS in this situation. Apart from merely acting as.
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- Support policy
- VST plug-in handling
- Troubleshooting steps
Support policy
Effects plug-in support is limited to plug-ins that are included with the Adobe Audition CC installation and the VST and Audio Units technologies as they are implemented within the application. Adobe technical support does not support problems due to the use of third-party plug-ins. If a third-party plug-in directly causes problems, please contact the plug-in manufacturer for support.
VST plug-in handling
Adobe Audition supports third-party 64-bit audio plug-ins in VST 2.4, VST 3.0 formats for macOS and Windows, and Audio Units for macOS. Note: VSTi and virtual instrument synthesis plug-ins are not supported at this time. To locate plug-ins or manage their visibility in the application, use the Audition Audio Plug-In Manager. From the Audition menu bar, select Effects > Audio Plug-In Manager. Here, you can add new folders if you’ve installed VST plugins to custom locations, Scan for new plug-ins, or manage which audio plug-ins are available inside the application.
VST 2.4 plug-ins typically get installed to
Windows: C:Program FilesSteinbergvstplugins
macOS: /Library/Audio/Plug-Ins/VST/
VST 3.0 plug-ins are strictly installed to
Windows: C:Program FilesCommon FilesVST3
macOS: /Library/Audio/Plug-Ins/VST/
Audio Units plug-ins are strictly installed to the path below, and are registered with the OS:
macOS: /Library/Audio/Plug-Ins/Components
You should only need to add folders if you have installed VST 2.4 plug-ins to a custom location. Otherwise, Audition would populate the folders list with the default locations.
Click the Scan for Plug-Ins button to search for new plug-ins on the system.
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Note: Audition will scan and attempt to open each plug-in in a separate process. Plug-Ins which cause a crash, or are virtual instruments, will be marked as disabled.
After plug-ins have been scanned, they are available in the Effects menu. Near the bottom of the menu dropdown are 3 items: VST, VST3, and AU.
VST: Contains VST 2.4 plug-ins which are organized by manufacturer. For instance, all plug-ins by iZotope will be in a flyout submenu labeled “iZotope”
VST3: Contains VST 3.0 plug-ins which are organized via their internal metadata. For instance, noise reduction plug-ins might be in a flyout submenu labeled “Restoration”
AU: Contains Audio Units plug-ins (macOS only) which are organized by manufacturer. For instance, all plug-ins that ship with macOS are in a flyout submenu labeled “Apple”
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Troubleshooting steps
To benefit most from this document, perform the tasks in this section in order. Keep track of the tasks that you perform and the results of each, including errors and other problems. Adobe Technical Support can use this information to better assist you if you need to call.
Note: The procedures in this document are based on the default interface of Windows XP. If the interface is customized, some procedures may vary. For example, a commonly encountered difference is the navigation to Control Panel from the Start menu: You may navigate Start > Settings > Control Panel instead of Start > Control Panel.
1. Restart Adobe Audition and deselect the plug-in from the VST plug-in manager.
Stability issues can arise if a plug-in fails to initialize properly. /adding-vst-plugins-to-studio-one-3.html. The Audio Plug-in Manager lists all the plug-ins that Adobe Audition has scanned and allows you to turn each plug-in on or off.
To disable a plug-in that caused Adobe Audition to freeze during startup:
1. Restart Adobe Audition
2. Open the Audio Plug-in Manger from the Effects menu
3. In the list of plug-in files find the plug-in from step 1 and uncheck the box next to it.
4. Click OK.
Note: For more information about managing plug-ins see the 'Managing audio plug-ins' section of this document.
2. Run the plug-in in a session with a lower sample rate.
Adobe Audition can record, process and playback most hardware supported sample rates (normally up to 196k); however, not all plug-ins were tested or designed for high sample rates. Editing and mixing sessions at high sample rates while incorporating plug-in effects can cause a significant drop in the performance of Adobe Audition or may cause Adobe Audition to crash. If you mix audio in the multitrack or use the mastering rack with files or sessions that are over 48k (48000 samples) and notice problem, then test the plug-in at a lower sample rate.
To check the sample rate capability of the plug-in:
1. In Multitrack Main view, select File > New Session.
2. Choose 48000 in the New Session dialog box.
3. Import an audio file and place it on track 1.
4. Add the effect that you want to test.
5. Play the session.
If the plug-in performs as expected at 48k, then consider finding another plug-in to take its place, or lowering the sample rate of files or sessions.
3. Temporarily disable plug-in automation.
Temporarily disable automation for individual tracks that have effects to test if effects automation is causing the problem. Within the Multitrack view, you can create new automation lanes for any available effect parameter. Not all plug-ins were tested or designed for automation and can cause a significant drop in the performance of Adobe Audition, or may cause Adobe Audition to crash.
To disable plug-in automation:
1. In Multitrack view, locate the track that has effects automation.
2. Change the Track Automation Mode to Off.
3. Play the session.
If the session plays as expected without automation, then consider replacing the plug-in with a similar plug-in, or enable Pre-Render the track.
For more information about
For more information about freezing tracks see Pre-render track effects to improve performance.
topIntroduction
Note to plug-in developers: implement support for these APIs to encourage host developers to add support for it.
Note to host developers: implement these APIs to encourage plug-ins to support them.
REAPER supports VST plug-ins (up to version 2.4 as well as version 3, though this document only applies to version 2.x). VST is a standard defined by Steinberg Media Technologies GMBH. To get the VST SDK (which you will need to implement VST plug-ins), you will need to download it from Steinberg, as we cannot distribute it.
It is worthwhile noting that while VST is a standard, it is neither an open standard (because you cannot easily distribute the SDK or things derived from it), nor is it a well defined standard.
This document will describe some REAPER-specific implementation notes for VST, as well as list some REAPER-specific extensions to the VST SDK/API that plug-in developers are encouraged to use to achieve great integration with REAPER. Additionally, we encourage other VST host developers to add support for these extensions, as we believe they are useful.
topImplementation Notes
REAPER currently implements a subset of the VST 2.4 standard as well as additional extensions-- this section discusses the former.
- Audio/sample processing: REAPER will use processDoubleReplacing if effFlagsCanDoubleReplacing is set in the flags.
REAPER will use processReplacing if effFlagsCanReplacing is set and processReplacing != process (if it equals it assumes that it is a faulty implementation of processReplacing). Additionally there is an option in the preferences to not use processReplacing for buggy plug-ins. Note that for plug-ins that have Cockos extensions (see below), the option (to not use processReplacing) is ignored, allowing known-good plug-ins to always run at full speed. - Threading/concurrency: Since audio processing can run in other threads from the UI, it's important to note what can run at the same time. REAPER is highly optimized to prevent UI and other actions from interrupting audio, so assume everything can (and WILL) run at the same time as your process/processReplacing, except:
- effOpen/effClose
- effSetChunk -- while effGetChunk can run at the same time as audio (user saves project, or for automatic undo state tracking), effSetChunk is guaranteed to not run while audio is processing.
- Dynamic parameters: REAPER can deal with the number of parameters for a plug-in changing on the fly. Use the extended host audioMasterAutomate callback described below to notify the host of parameter count changes (i.e. parameter X deleted, or new parameter Y), to preserve automation of higher indexed parameters when adding/removing lower parameters.
- Multiple inputs/outputs: REAPER allows the user to dynamically connect input/output pins of VSTs wherever they want, so enable as much I/O as you need. REAPER also allows input/output counts to change, HOWEVER it is recommended that any changes you make be done from within processReplacing() or process(), and use the old value of numInputs/numOutputs until the next call. Additionally the initial value of numInputs/numOutputs should be set to the most common settings.
- Longer labels: effGetParamName/effGetParamLabel/effGetParamDisplay all support up to 256 character strings (255+null).
REAPER on OS X is built using Cocoa and supports an extension which allows VSTs to create their UIs as Cocoa. Using Cocoa for UI of VST plug-ins within REAPER will result in a much cleaner integration, and has numerous advantages, including 64-bit (x86_64) support. We strongly encourage plug-in developers and other host developers to add support for Cocoa UIs via this API.
Note: on x86_64, REAPER assumes that all configuration windows are Cocoa, as Carbon is not supported.
When loading a VST plug-in on OS X, REAPER asks the plug-in if it would like to use Cocoa for its UI. This request is in the form of an effCanDo with the string 'hasCockosViewAsConfig', looking for the response of 0xbeef0000 - 0xbeefffff (the low 16 bits are ignored). If the VST has returned this value, all future effEditOpen calls will be passed with an NSView * as the parameter, rather than a Carbon window. The plug-in must track whether it has received a 'hasCockosViewAsConfig', and if it has returned the correct value. When adding a Cocoa UI, a plug-in should preferably add a single NSView to the passed NSView, via [(NSView *)ptr addSubview:myView] or similar.
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An example plug-in implementation:An example host implementation:Note: the above implementation is similar to REAPER's; a host could also query hasCockosViewAsConfig prior to each effEditOpen, should it be cleaner to implement (avoiding the extra per-VST storage)topExtensions
The following are extensions made available to VST plug-ins running in REAPER. Feel free to use them in your plug-ins, and encourage other VST host developers to add support for them.
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A REAPER aware VST plug-in can respond to effCanDo 'hasCockosExtensions', with 0xbeef0000 (returning this value), which will inform the host that it can call certain extended calls.A plug-in that responds to 'hasCockosExtensions' may choose to implement any subset of the extended calls. Extended vendor specific calls the plug-in can implement include:- effVendorSpecific(effGetParamDisplay, parm, buf, val)
Gets the formatted display of a particular value for a parameter, without setting the parameter. REAPER uses this when displaying the value of a VST's automated parameter on an envelope tooltip, for example.
Example host-side implementation: Example plug-in-side implementation: - effVendorSpecific(effString2Parameter, parm, buf, val)
Converts the user's string to a normalized parameter value, without setting the parameter. Reaper uses this when the user is manually editing an envelope node, for example.Calling with buf=' is a test for function availability.
Example host-side implementation: Example plug-in-side implementation: - effVendorSpecific(kVstParameterUsesIntStep, parm, NULL, NULL)
The plugin responds if the parameter is an enum, meaning that values move in discrete steps between states rather than smoothly.
Example host-side implementation: Example plug-in-side implementation: - effVendorSpecific(effGetEffectName, 0x50, &ptr, 0.0f)
Queries if the plug-in wants to override its instance name. If implemented, returns 0xf00d, and sets ptr to point to the name.
Example host-side implementation:Example plug-in-side implementation: - effVendorSpecific(effCanBeAutomated, parm, (void*)(INT_PTR)sample_offset_in_block, value)
Performs sample-accurate automation. Note that this should be used along with plug-in canDo of 'hasCockosSampleAccurateAutomation' that returns 0xbeef0000. This will be called one or more times in a block prior to processSamples. Returns 0xbeef if succeessful (sample-accurate automation is supported). - effVendorSpecific(effGetChunk,(VstIntPtr) named_parameter_name, buffer, buffer_size)
Query the string value for named_parameter_name, return 0xf00d if supported. - effVendorSpecific(effSetChunk,(VstIntPtr) named_parameter_name, buffer, 0.0)
Sets the string value for named_parameter_name, return 0xf00d if supported. - effVendorSpecific(0xdeadbef0, parm, rangeptr, 0.0)
Queries the range of a parameter (allowing the plug-in to use more than the 0.0..1.0 range that VST defines).
Example host-side implementation: Example plug-in-side implementation (in addition to responding to effCanDo/'hasCockosExtensions'): - audioMasterVendorSpecific(0xdeadbeef, audioMasterAutomate, listadjptr, 0.0)
Informs the host that the parameter list has changed dynamically (new parameters added or removed within the list), so the host can properly preserve existing automation and other mappings to higher numbered parameters.
Example host-side implementation: Example plug-in-side implementation:
topHost Functions
The following are extensions made available to VST plug-ins running in REAPER. Feel free to use them in your plug-ins, and encourage other VST host developers to add support for them.
There are some additional functions to enable better integration with the host, the primary interface for accessing these extensions is via the audioMaster callback. Suppose your callback pointer is named 'hostcb', then you would get each API with the following code: If an API is not implemented, hostcb() will return 0, and the resulting function shouldn't be called. Except when noted, all functions can be called from any context in any thread at any time. A list of functions defined:
- GetPlayPosition() GetPlayPosition() returns the current playback position of the project. This is the time the user is hearing (and the transport shows etc). The value is in seconds.
- GetPlayPosition2() GetPlayPosition() returns the current playback decode position of the project. This is the time of the audio block that is being processed by the host. The value is in seconds. This may be behind where your plug-in is processing, due to anticipative processing and/or PDC.
- GetCursorPosition() GetCursorPosition() returns the current edit cursor position (if any), in seconds.
- GetPlayState() GetPlayState() returns an integer value representing the project play state. 1=play, 2=paused, 5=recording, 6=record paused.
- SetEditCurPos() SetEditCurPos() repositions the edit cursor to 'time' (in seconds), optionally moving the view if necessary, and optionally seeking playback (if playing back). This function should ONLY be called from a UI context (i.e. from the editor window, NOT from audio processing etc).
- GetSetRepeat() GetSetRepeat() is used to change or query the transport 'loop/repeat' state. Pass a parameter of -1 to query the repeat state, 0 to clear, 1 to set, and >1 to toggle. The return value is the new value of the repeat state. ONLY use this function to change the repeat state from the UI thread (however you can query safely at any time).
- GetProjectPath() GetProjectPath() can be used to query the path that media files are stored in for the current project.
- OnPlayButton(), OnPauseButton(), OnStopButton() These functions control the main transport for the host app. Only call these from the UI thread.
- IsInRealTimeAudio() Returns nonzero if in the main audio thread, or in a thread doing synchronous multiprocessing. In these instances low latency is key. If this is 0, and you are in processReplacing, then you are being called in an anticipative processing thread.
- Audio_IsRunning() Returns nonzero if the audio device is open and running.
- Additional API functions are listed in the REAPER Extension Plug-in SDK.
Some API functions take context pointers such as ReaProject*, MediaTrack*, MediaItem_Take*, etc. A VST running within REAPER can request its own context via the audioMasterCallback:Valid values for request
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include:- 1: retrieve MediaTrack* (zero if not running as track-FX)
- 2: retrieve MediaItem_Take* (zero if not running as take-FX)
- 3: retrieve ReaProject*
- 5: retrieve channel count of containing track (use (int)(INT_PTR)ctx).
- 6: retrieve position in chain (zero if unsupported), 1=first item, 2=second. 0x1000000 set if in record-FX or monitoring-FX. -- v6.11+