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author prymula <prymula76@outlook.com>
date Wed, 31 Jan 2024 13:23:13 +0100
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1 # DPF - DISTRHO Plugin Framework
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3 This file describes the available features for each plugin format.
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4 The limitations could be due to the plugin format itself or within DPF.
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5 If the limitation is within DPF, a link is provided to a description below on the reason for it.
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7 | Feature | JACK/Standalone | LADSPA | DSSI | LV2 | VST2 | VST3 | CLAP | Feature |
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8 |---------------------|---------------------------------------|--------------------|---------------------|-------------------------------|----------------------------|----------------------------|-------------------------------|---------------------|
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9 | Audio port groups | [Yes*](#jack-audio-port-groups) | No | No | Yes | No | Yes | Yes | Audio port groups |
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10 | Audio port as CV | Yes | No | No | Yes | No | [Yes*](#vst3-cv) | [No*](#work-in-progress) | Audio port as CV |
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11 | Audio sidechan | Yes | No | No | Yes | [No*](#vst2-deprecated) | Yes | Yes | Audio sidechan |
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12 | Bypass control | No | No | No | Yes | [No*](#vst2-deprecated) | Yes | Yes | Bypass control |
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13 | MIDI input | Yes | No | Yes | Yes | Yes | Yes | Yes | MIDI input |
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14 | MIDI output | Yes | No | No | Yes | Yes | Yes | Yes | MIDI output |
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15 | Parameter changes | Yes | No | No | [No*](#lv2-parameter-changes) | Yes | Yes | Yes | Parameter changes |
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16 | Parameter groups | No | No | No | Yes | Yes | [No*](#work-in-progress) | Yes | Parameter groups |
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17 | Parameter outputs | No | No | No | Yes | No | Yes | Yes | Parameter outputs |
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18 | Parameter triggers | Yes | No | No | Yes | [No*](#parameter-triggers) | [No*](#parameter-triggers) | [No*](#parameter-triggers) | Parameter triggers |
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19 | Programs | [Yes*](#jack-parameters-and-programs) | [No*](#ladspa-rdf) | [Yes*](#dssi-state) | Yes | [No*](#vst2-programs) | Yes | No | Programs |
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20 | States | Yes | No | [Yes*](#dssi-state) | Yes | Yes | Yes | Yes | States |
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21 | Full/internal state | Yes | No | No | Yes | Yes | Yes | Yes | Full/internal state |
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22 | Time position | Yes | No | No | Yes | Yes | Yes | Yes | Time position |
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23 | UI | [Yes*](#jack-custom-ui-only) | No | External only | Yes | Embed only | Embed only | Yes | UI |
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24 | UI bg/fg colors | No | No | No | Yes | No | No? | No | UI bg/fg colors |
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25 | UI direct access | Yes | No | No | Yes | Yes | Yes | Yes | UI direct access |
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26 | UI host-filebrowser | No | No | No | Yes | [No*](#vst2-deprecated) | [No*](#work-in-progress) | [No*](#work-in-progress) | UI host-filebrowser |
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27 | UI host-resize | Yes | No | Yes | Yes | No | Yes | Yes | UI host-resize |
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28 | UI remote control | No | No | Yes | Yes | No | Yes | No | UI remote control |
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29 | UI send midi note | Yes | No | Yes | Yes | Yes | Yes | Yes | UI send midi note |
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30
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31 For things that could be unclear:
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32
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33 - "States" refers to DPF API support, supporting key-value string pairs for internal state saving
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34 - "Full state" refers to plugins updating their state internally without outside intervention (like host or UI)
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35 - "UI direct access" means `DISTRHO_PLUGIN_WANT_DIRECT_ACCESS` is possible, that is, running DSP and UI on the same process
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36 - "UI remote control" means running the UI on a separate machine (for example over the network)
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37 - An external UI on this table means that it cannot be embed into the host window, but the plugin can still provide one
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38
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39 # Special notes
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40
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41 ## Parameter triggers
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42
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43 Trigger-style parameters (parameters which value is reset to its default every run) are only supported in JACK and LV2.
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44 For all other plugin formats DPF will simulate the behaviour through a parameter change request.
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45
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46 ## JACK audio port groups
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47
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48 DPF will set JACK metadata information for grouping audio ports.
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49 This is not supported by most JACK applications at the moment.
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50
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51 ## JACK parameters and programs
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52
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53 Under JACK/Stanlone mode, MIDI input events will trigger program and parameter changes.
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54 MIDI program change events work as expected (that is, MIDI program change 0 will load 1st plugin program).
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55 MIDI CCs are used for parameter changes (matching the `midiCC` value you set on each parameter).
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56
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57 ## JACK custom UI only
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58
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59 There is no generic plugin editor view.
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60 If your plugin has no custom UI, the standalone executable will run but not show any window.
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61
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62 ## LADSPA RDF
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63
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64 Programs for LADSPA could be done via LRDF but this is not supported in DPF.
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65
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66 ## DSSI State
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67
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68 DSSI only supports state changes when called via UI, no "full state" possible.
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69 This also makes it impossibe to use programs and state at the same time with DSSI,
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70 because in DPF changing programs can lead to state changes but there is no way to fetch this information on DSSI plugins.
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71
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72 To make it simpler to understand, think of DSSI programs and states as UI properties.
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73 Because in DPF changing the state happens from UI to DSP side, regular DSSI can be supported.
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74 But if we involve programs, they would need to pass through the UI in order to work. Which goes against DPF's design.
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75
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76 ## LV2 parameter changes
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77
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78 Although this is already implemented in DPF (through a custom extension), this is not implemented on most hosts.
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79 So for now you can pretty much treat it as if not supported.
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80
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81 ## VST2 deprecated
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82
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83 Not supported in DPF at the moment.
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84 It could eventually be, but likely not due to VST2 being phased out by Steinberg.
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85 Contact DPF authors if you require such a feature.
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86
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87 ## VST2 programs
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88
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89 VST2 program support requires saving state of all programs in memory, which is very expensive and thus not done in DPF.
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90
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91 ## VST3 CV
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92
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93 Although VST3 officially supports CV (Control Voltage) tagged audio ports,
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94 at the moment no host supports such feature and thus it is not possible to validate it.
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95
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96 ## Work in progress
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97
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98 Feature is possible, just not implemented yet in DPF.