Phase 31: add CLAP, VST2 and VST3 mono effect hosting
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114 changed files with 10369 additions and 75 deletions
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@ -272,3 +272,10 @@ removal. Override `PREFIX`, `exec_prefix`, `bindir`, `libdir`, `includedir`,
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`datarootdir`, `datadir`, `docdir`, `pkgconfigdir`, `licensedir`, `examplesdir` or
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`desktopdir` as needed. `DESTDIR` adds staging separately; pass the same layout
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to uninstall. See RELEASING.md for commands and RELEASE_NOTES.md for upgrades.
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Phase 31 modern plugin adapters build in C99 using the pinned header-only CLAP
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and VST3 C APIs under third_party; there is no network build or SDK runtime.
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VST2 compatibility uses original ABI declarations. `make test-modern-plugins`
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runs original shared-library fixtures without a server; `make test-gui-modern-plugins`
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adds GUI/browser/undo/reopen tests under Xvfb. The fixtures also run in `make test`
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and therefore in sanitizer/release builds. Notices are installed with LICENSE.
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@ -22,7 +22,7 @@
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plus baseline and at most one reserved metadata snapshot; GUI edits reserve
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history before mutation/publication. Media is
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never removed by undo/delete. Broad screen-reader/accessibility testing is pending.
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- Format v10 reads v1–v9 and uses relative local media references. External absolute
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- Format v11 reads v1–v10 and uses relative local media references. External absolute
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media/module paths need manual repair after relocation. Saving does not bundle
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media; missing media stays referenced, missing plugins reject GUI installation.
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Unknown data is rejected rather than stripped. Post-rename directory-sync errors
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@ -73,3 +73,11 @@ The project format is Linux/POSIX oriented; absolute plugin paths, architecture,
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ABI and JACK/device configuration must be supplied on another system. Unknown
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fields are rejected, not preserved. See PROJECT_FORMAT.md for versions 1–10 and
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RECOVERY.md for save failures after rename.
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Phase 31 CLAP/VST2/VST3 loading supports Linux binary modules, one-input mono
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float32 zero-latency effects at default configuration. No modern parameter edit,
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automation, programs, opaque state, MIDI/instruments, transport, custom editor,
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workers, sidechains or true stereo/multichannel buses are implemented. Plugin
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bundles must be opened at their actual Linux shared-library binary. Only original
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ABI fixtures are qualified; arbitrary third-party modern plugins remain untested.
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See PLUGIN_HOSTING.md and decision 0010 for lifecycle and licensing boundaries.
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@ -2,7 +2,8 @@
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The repository's original code, example and documentation are under the MIT
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license in LICENSE (copyright Johannes Findeisen). No energyXT source, artwork,
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external plugin SDK, vendored DSP or binary asset is included. The source archive
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proprietary SDK, vendored DSP or plugin binary is included. Phase 31 vendors
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permissively licensed ABI headers with their own notices. The source archive
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contains repository files and an export manifest; it does not bundle system
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libraries. Installation includes LICENSE and these documents.
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@ -54,3 +55,19 @@ GPL-2.0-or-later). Testing/loading a user-installed module does not grant the ri
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to bundle or relicense it. Redistributors must review each chosen module and the
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combined distribution's obligations separately; xtc's MIT grant covers only its
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original code. No third-party plugin is included in source archives or installs.
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## Phase 31 pinned header dependencies
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CLAP headers are MIT, copyright Alexandre BIQUE, from upstream commit
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`a47f6badb49d948fd009998f28309cdab78979c9`. The generated VST3 C ABI header is
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BSD-3-Clause, copyright Steinberg Media Technologies GmbH, from commit
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`93a116f7c6c52a317ec3aaee9b13789068b5234e`. Exact licenses are retained under
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third_party and installed as CLAP-LICENSE / VST3-C-API-LICENSE. These are header
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specifications only: no external runtime SDK or network build step was added.
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Review updates explicitly; do not assume future revisions share the same license.
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The VST2 compatibility declarations and all three ABI fixtures are original MIT
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repository code; no Steinberg VST2 SDK or third-party plugin is bundled. Hosting
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an installed binary is distinct from SDK, trademark and plugin redistribution
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rights. Review those separately for any proposed distribution. Source archives
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retain upstream notices; binary installs also ship both header licenses.
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@ -204,3 +204,56 @@ live-sine CC maps without changing plugin state records. Direct static edits do
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not override existing lanes. Live CCs do not map to plugins; missing targets or
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modules fail without installing partial state. See CONTROL.md for timing,
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precedence, reset and backward-jump behavior.
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## Phase 31: CLAP, VST2 and VST3 effect loaders
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**File → Load plugin** now detects LADSPA, CLAP, VST2 and VST3 entry points in an
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explicit trusted Linux module. **Insert plugin on selected wire** and **Replace
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selected plugin** use the same browser and transactional graph preparation. The
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identity/editor dialog names the format and stable ID. Existing LADSPA controls
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and automation continue to work. Modern effects currently use their default
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configuration: the editor shows identity but no editable parameters.
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Choose the actual binary: `.clap` for CLAP, a VST2 `.so` exporting `VSTPluginMain`,
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or a VST3 bundle's `Contents/<architecture>-linux/<module>.so` exporting
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`ModuleEntry`, `ModuleExit` and `GetPluginFactory`. The chooser does not resolve
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bundle directories or recursively scan plugin folders. On Linux this avoids
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executing unrelated plugins just to discover one selected module. Auto-detection
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prefers CLAP, then VST2, then VST3, otherwise LADSPA; the C API also provides
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`xtc_plugin_probe_format` for an explicit format.
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The modern subset is **one mono audio input and one mono output, float32, default
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configuration, zero reported latency**. Stereo graph playback uses independent
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instances. True stereo/multichannel/sidechain buses, instruments, MIDI/events,
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custom editors, parameter changes/automation, programs/presets, opaque state,
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transport/time information, workers and latency compensation are not implemented
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for these three formats. Modern metadata with controls/automation is rejected,
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not silently ignored. VST3 event buses and CLAP note ports are rejected. Plugins
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requiring unsupported host extensions may refuse initialization. This is not a
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claim that all CLAP/VST2/VST3 plugins will load or sound identically after updates.
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Only original effect fixtures have been qualified for the new formats. Trusted
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plugin code is in-process and can crash/hang or violate realtime rules. No plugin
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binary is included in packages. A VST2 ABI adapter does not provide rights to the
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discontinued SDK or plugin redistribution. See decision 0010 and LICENSES.md.
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The control/main thread owns discovery, activation, module reference accounting,
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retirement and unloading. CLAP's start-processing call runs on the audio owner;
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main-thread callbacks are coalesced and serviced via `xtc_plugin_idle` (GUI timer,
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currently 100 ms). C hosts using CLAP must pump that API on their serialized main
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thread while instances live, and stop/join audio before destruction. Restart and
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VST2 I/O-change requests make subsequent blocks fail/silence; stop and rebuild or
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reload the plugin rather than reconfiguring inside the callback. CLAP process
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errors and VST3 failure results silence a block. VST2 has no process error return.
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```sh
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make all test gui test-modern-plugins test-gui-modern-plugins
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make test-sanitize analyze
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```
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Original CLAP/VST2/VST3 shared-library fixtures exercise exact in-place and stereo
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processing, entry/instance lifetimes, rejected layouts, partial initialization,
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CLAP start/process failures, graph replacement rollback, 50 plan retirements per
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format, missing modules, v11 save/reopen and GUI add/browser/undo/reopen. Host
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allocation/loading/unloading guards remain active while rendering. This evidence
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qualifies the subset above, not arbitrary external plugins or physical audio.
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@ -1,6 +1,6 @@
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# Project format v10 (reads v1–v9)
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# Project format v11 (reads v1–v10)
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Phases 5–28 use a bounded text format implemented in C99 without a parser library.
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Phases 5–31 use a bounded text format implemented in C99 without a parser library.
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The extension is `.xtc`. File operations run exclusively on the control thread.
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The project owns its graph, tracks and silent/audio arrangement regions. Audio samples remain in external WAV
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files; MIDI notes are stored inline.
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@ -12,7 +12,7 @@ Fields use ASCII spaces. Integers are unsigned decimal, without signs.
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Counts determine the number of subsequent records:
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```text
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XTC_PROJECT 10
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XTC_PROJECT 11
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APP 0 1 0
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TEMPO 120000
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IDS 1 1
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@ -104,8 +104,8 @@ node types 1..4, migrating their clips to empty asset paths. Version 2 accepts
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node types 1..5 and ASSET records. Both migrate to MIDI=0 and no notes.
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Version 3 accepts instrument nodes and MIDI/NOTES records. Versions 1–3 migrate
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all tracks to unity gain, centered pan, mute/solo off and no automation.
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Saving always writes v10. Unknown versions are rejected without replacing the destination; older
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applications without v10 support cannot read current saves. Migration and maximum-path roundtrips are tested.
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Saving always writes v11. Unknown versions are rejected without replacing the destination; older
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applications without v11 support cannot read current saves. Migration and maximum-path roundtrips are tested.
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## Ownership and failures
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@ -254,7 +254,7 @@ v9 exact roundtrips and malformed routing.
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## Phase 26: version 10 interpolation and controller bindings
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The current writer emits v10 and reads v1–v9. Track/bus automation points are
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Phase 26 introduced v10 with migration from v1–v9. Track/bus automation points are
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`POINT track_id parameter tick value_bits step`, where step is 0 linear or 1
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hold for the segment starting there. v1–v9 points migrate to step=0. LADSPA
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`PARAM` encoding remains unchanged (already has interpolation mode).
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@ -274,8 +274,8 @@ must rebuild and initialize the appended `xtc_automation_point.step` field.
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## Phase 28 compatibility and diagnostic contract
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The current reader accepts versions 1–10 and the writer always emits version 10.
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There is no format change in Phase 28. Saving an older document upgrades it;
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The current reader accepts versions 1–11 and the writer always emits version 11.
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Phase 28 made no format change; Phase 31 adds plugin format identity in v11. Saving an older document upgrades it;
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retain an original backup if an older application must still open it. APP is
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informational; compatibility depends on the format version, not the producer's
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application version. A future incompatible schema requires a new format number.
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@ -337,3 +337,33 @@ preserve the old bytes and remove the temporary. After rename, a sync failure
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reports I/O while leaving a complete new document; inspect it before retrying.
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Fault wrappers are linked into tests only. These tests complement killed-writer
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coverage in `make test-recovery`; they do not qualify power-cut behavior.
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## Phase 31: version 11 plugin format identity
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Immediately after every plugin MODULE record, v11 requires:
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```text
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FORMAT format_number hex_identity_or_dash
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```
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0 = LADSPA, 1 = CLAP, 2 = VST2, 3 = VST3. Identity is `-` for LADSPA/VST2;
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CLAP uses its stable plugin ID (1–127 non-NUL bytes); VST3 uses the 32-character lowercase
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hex class ID string, itself hex-encoded like other byte strings. PLUGIN's unique
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ID remains the VST2/LADSPA integer ID (zero for CLAP/VST3), descriptor index and
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label. MODULE is still the actual absolute binary path. Versions 1–10 migrate
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to format 0 and empty extra identity. Older readers reject v11. The public plugin
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struct has grown; C/C++ consumers must rebuild and initialize it to zero.
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Modern adapters accept one-input mono effects, default configuration only, with
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zero controls and automation points. Unsupported modern control metadata is
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rejected, not discarded. State/editor/preset changes are not exposed, so no opaque
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state is serialized. Reloading recreates plugin defaults, which can change after
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a plugin update or with its external configuration. Matching ID/name/layout is
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not a binary hash or sound-reproducibility guarantee. See PLUGIN_HOSTING.md.
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Metadata validation and inspection never initialize modules. Actual graph
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preparation verifies format, descriptor, stable identity, name and layout before
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publishing. Missing module metadata survives C load/save; GUI preparation retains
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the existing document on failure. No automatic path search or plugin substitution
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occurs. Current and historical migration fixtures, malformed fields, identity
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mismatch, missing-module and exact-render roundtrips cover this extension.
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@ -1,6 +1,6 @@
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# Persistence and failure recovery
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The project format is v10. Readers migrate v1–v9, validate bounded input
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The project format is v11. Readers migrate v1–v10, validate bounded input
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and atomically install a candidate only after complete success. Existing tests
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cover exact migration/roundtrip, truncations, malformed references, counts,
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IDs, nonfinite values and failed GUI/backend installation. Native processors
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@ -87,5 +87,12 @@ rename and directory-sync errors. Pre-rename failures retain the previous bytes
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and clean temporary files. Post-rename sync errors leave a complete new file and
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return failure; there is no rollback after replacement. Load diagnostics identify
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the expected record and syntax line, or line zero for whole-model/I/O stages.
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Unknown versions report the supported range (1–10); unknown records/fields are
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Unknown versions report the supported range (1–11); unknown records/fields are
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rejected without partially changing the current project.
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Modern CLAP/VST2/VST3 module identity is preserved in v11 metadata even when the
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binary is unavailable. Restore the compatible saved binary path and retry Open.
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CLAP restart and VST2 I/O-change requests fail/silence subsequent blocks; stop
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and rebuild/reload rather than attempting callback-time reconfiguration. Modern
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instances restart at default configuration; no edited opaque state is exposed
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or saved by the initial adapters. Trusted plugin crashes cannot be contained.
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@ -15,7 +15,7 @@ undo/redo and a generic LADSPA editor. JACK is the only live audio/MIDI backend;
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core validation and offline rendering work without it. Native/LADSPA processors
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are trusted in-process code. No proprietary energyXT resources are included.
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Project format v10 reads versions 1–10 transactionally. Syntax diagnostics identify
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Project format v11 reads versions 1–11 transactionally. Syntax diagnostics identify
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records and lines. `xtc-check --inspect` lists dependency paths without executing
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plugins. Phase 29 adds timing/CPU/RSS reports, repeatable stress runs and virtual
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endurance. Phase 30 adds configurable install directories, shared install/remove
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@ -24,7 +24,7 @@ inventory, installed MIDI examples and source archive checksum sidecars.
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## Upgrading and removal
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Back up documents and external media before upgrading. Opening an older project
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does not rewrite it; saving upgrades it to v10, which older readers may reject.
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does not rewrite it; saving upgrades it to v11, which older readers may reject.
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Use Save As for a separate migrated copy. Moving a project folder preserves media
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stored inside it via relative references. Absolute media and plugin module paths
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must be restored separately. There is no bundled plugin/media migration or saved
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@ -51,3 +51,9 @@ the shared development host; the project timing comparison passed. This alert
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was not hidden by changing the baseline. See PERFORMANCE.md before using these
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measurements as latency expectations. Sanitizers and virtual endurance qualify
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software paths, not hardware timing.
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Phase 31 adds default-configuration CLAP/VST2/VST3 mono effect loaders, common
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GUI discovery/insertion/replacement and v11 format identity. Pinned MIT CLAP and
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BSD-3-Clause VST3 C headers ship with notices; VST2 uses original compatibility
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declarations. Modern instruments, parameters/state/editors and multichannel
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layouts remain unsupported. No third-party modern plugin has been qualified.
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@ -860,6 +860,45 @@ byte-identical binaries and repacks; and binary manifest/hash/relocation checks.
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No public release, tag, version bump or system install is performed. Physical
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qualification and the Phase 29 graph timing alert remain documented limitations.
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## Phase 31 — CLAP, VST2 and VST3 Plugin Loading
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### Goal
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Load trusted Linux CLAP, VST2 and VST3 audio effects through the graph and GUI,
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with explicit lifecycle, format compatibility and realtime ownership contracts.
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### Tasks
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- Review and pin redistributable ABI headers and license notices; keep C99 adapters.
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- Add explicit format probing and compatible mono float32 effect initialization.
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- Integrate processing, immutable plans, retirement and failure rollback.
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- Share module entry lifetimes across overlapping instances; defer main-thread callbacks.
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- Add format/stable identity metadata with v11 migration and missing-module retention.
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- Generalize the GUI browser, insertion/replacement and identity presentation.
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- Test original fixtures for all three ABIs, partial failure cleanup, callback safety,
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save/reopen, missing dependencies and GUI lifecycle.
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- Document the initial default-configuration effect subset and unsupported extensions.
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### Acceptance criteria
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- Compatible fixtures for all three formats render exact expected audio in graphs.
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- Failed loading/identity/layout/initialization retains the current project/plan.
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- Loading and reclamation remain off the audio callback, with bounded host processing.
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- Project files preserve identity and missing references without executing plugins.
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- Core/GUI builds, regressions, sanitizers and release installation checks pass.
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### Implementation status
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Implemented in C99 with pinned permissive ABI headers, shared entry lifetimes,
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CLAP main-thread scheduling, graph/GUI integration and v11 plugin identity.
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Normal/minimal builds, core and GUI plugin fixtures, live JACK/workflow,
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ASan/UBSan core and GUI checks, static analysis, staged installation and
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source/binary release checks pass. Tests include activation/start/process and
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restart errors, rejected layouts/identities, missing modules and retirement.
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GUI leak checking retains only the existing Fontconfig suppression; core checks
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use none. Only original ABI fixtures are qualified; arbitrary third-party plugins
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and physical audio remain unverified. See PLUGIN_HOSTING.md and decision 0010.
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The initial subset excludes instruments/events, editable modern parameters,
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opaque state/custom editors, true stereo/multichannel and latency compensation.
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These require separate future work; they are not claimed as implemented by loading.
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---
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## Recommended Execution Order
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@ -160,3 +160,11 @@ or starting JACK. Exit codes: 0 = valid metadata and available files, 2 = missin
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or unreadable references, 1 = metadata/I/O error. File availability does not
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certify WAV contents or plugin compatibility. See [PROJECT_FORMAT.md](PROJECT_FORMAT.md)
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for the compatibility and relocation policy.
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Phase 31: **File → Load plugin** supports LADSPA plus an initial Linux
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CLAP/VST2/VST3 effect subset. Select the actual module binary (`.clap` or `.so`,
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including a VST3 bundle's inner binary). Modern effects require one mono input
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and output, float32 and zero latency; they use default configuration. Instruments,
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modern parameter editing/automation, opaque state and custom editors are not
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implemented. Projects now save v11 and read v1–v11. See PLUGIN_HOSTING.md for the
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full contract and test/qualification limits.
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42
docs/decisions/0010-modern-plugin-effects.md
Normal file
42
docs/decisions/0010-modern-plugin-effects.md
Normal file
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@ -0,0 +1,42 @@
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# 0010 — Bounded CLAP, VST2 and VST3 effect loading
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Accepted for Phase 31. The user's request to support these three formats
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supersedes the earlier recommendation to choose only one external format.
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Keep the engine/model/host adapters in C99. CLAP uses pinned MIT headers and VST3
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uses the upstream BSD-3-Clause generated C ABI. No SDK runtime library is needed;
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Linux dynamic loading and POSIX thread identity are existing platform facilities.
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VST2 uses original minimal compatibility declarations, not the discontinued SDK.
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See third_party/README.md and LICENSES.md for exact revisions and notices.
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Reuse the existing plugin graph node, paired mono instances and immutable plan
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ownership. The common facade routes LADSPA to its existing implementation and
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modern formats to a separate adapter. This preserves LADSPA controls/automation
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and metadata behavior. All three new adapters initially accept one mono input
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and output, float32, zero reported latency and no event buses. Default plugin
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configuration is used; no parameter/controller/editor or opaque-state access is
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exposed. These are usable effect loaders, not complete implementations of every
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extension in the formats. Unsupported layouts fail explicitly.
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Project v11 adds format plus CLAP stable ID or VST3 class ID to each saved plugin.
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Older plugins migrate to LADSPA with an empty extra ID. VST2 retains its integer
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unique ID. Reopening checks format/index/identity/name/layout; metadata operations
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never open modules. This does not authenticate a binary or freeze defaults across
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plugin releases. No modified opaque state exists in this initial API to persist.
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Discovery and instance creation execute trusted module code on one serialized
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main/control thread. A module cache balances CLAP entry init/deinit and Linux
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VST3 ModuleEntry/ModuleExit across overlapping graph instances and retired plans.
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CLAP start_processing runs on the processing owner; stop_processing runs after
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quiescence with the symbolic audio-thread context. CLAP callback requests use
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lock-free flags and are serviced by xtc_plugin_idle on main/control (the GUI timer
|
||||
calls it). Restart/I/O-change requests latch an error for re-preparation; the audio
|
||||
callback does not reconfigure or wait for GUI work. CLAP process wakeups need no
|
||||
queue because playback processes every block, including silence.
|
||||
|
||||
Only preallocated buffers and plugin processing occur in audio. Error status
|
||||
silences the failed block; nonfinite/subnormal samples are sanitized. Plugin code
|
||||
can still allocate, block, corrupt memory or crash; there is no sandbox, scanner
|
||||
subprocess or recoverable crash boundary. Modules unload only after destruction
|
||||
on a quiescent/control owner. Real third-party plugins and hardware timing remain
|
||||
unqualified; original ABI fixtures demonstrate the bounded contracts.
|
||||
Loading…
Add table
Add a link
Reference in a new issue