318 lines
8.4 KiB
Markdown
Executable File
318 lines
8.4 KiB
Markdown
Executable File
# Overview and Source Tree Layout
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Welcome to the in-code documentation for Ardour.
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The main components of Ardour are as follows:
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- A GTK2 front-end, in `gtk2_ardour`.
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- libardour, the audio-processing back-end, in `libs/ardour`.
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The source tree is laid out as follows:
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## Front Ends
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* `gtk2_ardour/`</dt>
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The main Ardour GUI -- This is where most of the complexity is.
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It is cleanly separated from the backend and processing engine.
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* `headless/`
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hardour -- headless Ardour, mostly demo-code how to use Ardour without a GUI.
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* `session_utils/`
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command-line tools using libardour (e.g. export)
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* `luasession/`
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arlua -- fully fledged commandline interface to libardour
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## Libraries
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A collection of libraries and utility functions. Most are shared
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libraries, and almost all are exclusive to Ardour.
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A few specific libraries are compiled statically (e.g. fluidsynth for use in plugins).
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### Ardour specific libs
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* `libs/pbd/`
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Generic utility classes. This is used the basis for all Ardour specific libraries.
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It provides basic concepts and OS abstractions.
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*The name comes from "Paul Barton-Davis", Paul's full name at the time he started working on working on audio software.*
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* `libs/evoral/`
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Evoral is Ardour's event Library, used for control events, control lists, automation evaluation,
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parameter interpolation, parameter descriptions, incl. MIDI event abstraction.
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- `libs/evoral/libsmf/` (contains several non-upstreamed fixes)
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Handling Standard %MIDI File (Evoral::SMF) format. Abstracted to C++ in SMF.{cc,h}
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* libs/backends/
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Interaction with Operating System's Audio/MIDI API:
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ALSA, CoreAudio, JACK, PortAudio/ASIO, PulseAudio
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see ARDOUR::AudioBackend
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* `libs/surfaces/`
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Control Surfaces, dynamically loaded by libardour on runtime,
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to remote-control ardour (midi bindings, network etc).
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see ARDOUR::ControlProtocol
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* `libs/midi++2/`
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%MIDI parsing, MIDNAM handling, Port abstraction for I/O
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* `libs/temporal`
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Various utility code for dealing with different kinds of time,
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including Timecode, and musical time conversions (Temporal::Beats, Temporal::BBT_Time).
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This library also provides the fundamental time types, and the *TempoMap*.
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See <https://ardour.org/representing-time.html> for more information.
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* `libs/panners/`
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Pan plugins (stereo-balance, VBAP, etc) are dynamically loaded at runtime.
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see ARDOUR::Panner
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* `libs/audiographer/`
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Mini Ardour inside Ardour to export audio-files from sessions.
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It is a combination of AudioGrapher::Source and AudioGrapher::Sink classes that are chained together by ARDOUR::ExportGraphBuilder as shown in the ASCII art
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[Export Graph](https://git.ardour.org/ardour/ardour/src/commit/0df0e14e2309a00d433827fa34b87638b87f4fff/libs/ardour/export_graph_builder.cc#L73-L154).
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* `libs/ardour/`
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This is it. libardour runs Ardour sessions.
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All realtime processing happens here, plugins are managed etc.
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Some starting points are ARDOUR::Route ARDOUR::Session ARDOUR::Processor
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### UI related libs
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* libs/gtkmm2ext/
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Utility Library to extend GDK, GTK, and basic abstraction for UIs
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and event-loops. This library is not limited to the GUI, but also
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used for other graphical interfaces (e.g. Push2, NI Maschine control
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surfaces).
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* `libs/canvas/`
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Cairo Canvas, provides a slate for scalable drawing and basic layout/packing
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This is used by Ardour's main editor.
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See ArdourCanvas::GtkCanvas and ArdourCanvas::Item
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* `libs/widgets/`
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Ardour GUI widgets (buttons, fader, knobs, etc). They are basically all CairoWidget%s
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* `libs/waveview/`
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Threaded waveform rendering and waveform image cache.
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* libs/tk/
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A localized version of GTK+2, renamed as YTK. See Gtk namespace for relevant documentation.
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- `libs/tk/ydk` `libs/tk/ytk`
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gdk, gtk based on upstream gtk+ 2.24.23
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- `libs/tk/ydk-pixbuf`
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stripped down version of gdk-pixbuf 2.31.1
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- `libs/tk/ydkmm` , `libs/tk/ytkmm`
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gdkmm, gtkmm based on upstream gtkmm 2.45.3
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- `libs/tk/ztk`
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atk 2.14.0
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- `libs/tk/ztkmm`
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atkmm 2.22.7
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- `libs/tk/suil`
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A local copy of <https://github.com/lv2/suil/> (based on 0.10.8).
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Since GTK2 is in our source tree, we also need to provide various plugin UI wrappers
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(`x11_in_gtk2`, `win_in_gtk2`, `suil_cocoa_in_gtk2`).
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### Plugin Scan Tools
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By default plugins are scanned by a dedicated external process. If that crashes the
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main application is not affected, and the plugin that causes the scanner to crash can be
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blacklisted.
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For practical and historical reasons the actual scanner code lives inside libardour.
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* `libs/auscan/`
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Apple Audio Unit Plugin Scan commandline tool.
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* `libs/fst/`
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VST2/3 plugin scan commandline tools.
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* `libs/vfork/`
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A exec-wrapper which redirects file-descriptors to be used with vfork(2).
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It is used to launch external applications, without impacting real-time
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constraints of the calling process.
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### Ardour Community Effect (ACE) Plugins
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* `libs/plugins/`
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A *bread and butter* set of LV2 Plugins included with Ardour.
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Many of them are custom version of existing plugins (zamaudio, x42),
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that have been customized to be bundled with Ardour on all platforms
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that ardour runs on.
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### Independent, standalone libs
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These are 3rd party libs that have been copied into Ardour's source-tree.
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* `libs/aaf/`
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Unmodified <https://github.com/agfline/LibAAF> for importing AAF sessions.
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Use `tools/update_libaaf.sh` to update from upstream.
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* `libs/appleutility/`
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Utility classes, abstraction for CoreAudio and AudioUnits (OSX, macOS)
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* `libs/ardouralsautil/`
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Utility class for device-listing (used by the JACK and ALSA backends).
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Device-reservation commandline tool (linked against libdbus), which is
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also available from <https://github.com/x42/alsa_request_device>
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* `libs/clearlooks-newer/`
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GTK theme engine (used by `gtk2_ardour`)
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* `libs/fluidsynth/`
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Stripped down (library only) and slightly customized version of fluidsynth.
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Use `tools/update_fluidsynth.sh` to update from upstream.
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* `libs/hidapi/`
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Unmodified <https://github.com/signal11/hidapi> for interaction with some
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control surfaces (Push2, NI Maschine)
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* `libs/libltc/`
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Unmodified <https://github.com/x42/libltc/> for Linear Timecode en/decoding. see LTCFrame.
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* `libs/lua/`
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Lua Script interpreter and C++ class abstraction
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- libs/lua/lua-5.3.5 is unmodified upstream Lua-5.3.5
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- libs/lua/LuaBridge is a highly customized version of
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<https://github.com/vinniefalco/LuaBridge> (C++ bindings)
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* `libs/ptformat/`
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Unmodified <https://github.com/zamaudio/ptformat> for loading ProTools sessions.
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* `libs/qm-dsp/`
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Stripped down version of <https://github.com/c4dm/qm-dsp>
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The Queen Mary DSP library is used by VAMP Plugins.
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* `vamp-plugins`
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VAMP plugins for audio analysis and offline processing (uses qm-dsp)
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* `libs/vamp-pyin/`
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VAMP plugins for pitch and note-tracking (uses qm-dsp), offline analysis
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* `libs/vst3/`
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Stripped down version of Steinberg's VST3 SDK
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<https://github.com/steinbergmedia/vst3sdk/>
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use `tools/update_vst3.sh` to update from upstream
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* `libs/zita-convolver/`
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A convolution kernel, so far only available to Lua scripts.
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* `libs/zita-resampler/`
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Efficient resampler with variable rate, useful for adaptive resampling.
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Mainly used for vari-speed playback. This has been customized for multiple mono
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channel processing (ArdourZita::VMResampler), and optimized to skip processing for a ratio of 1:1.
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## Resource Files
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These are platform independent files, and bundled as-is.
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* `share/export/`
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Export Format and Presets (see <https://manual.ardour.org/exporting/edit-export-format-profile/>)
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* `share/mcp/`
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Mackie control surface device files (see <https://manual.ardour.org/using-control-surfaces/devices-using-mackielogic-control-protocol/>)
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* `share/midi_maps/`
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Generic %MIDI control surface presets
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* `share/osc/`
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[TouchOSC](https://hexler.net/touchosc) layouts for use with Ardour's OSC control surface.
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* `share/patchfiles/`
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MIDNAM files, %MIDI synth descriptions (note-names, CC, PGM names)
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* `share/scripts/`
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Lua scripts (files with a leading underscore are not bundled).
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see `share/scripts/README` for file name convention.
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* `share/templates/`
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Session templates (currently none)
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## Miscellaneous
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* `doc/`
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Misc developer oriented documentation files and Doxygen
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* `patches/`
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Some .diff files for the build-stack.
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* `tools/`
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Various developer tools, most notably packaging scripts
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