1. DPF
DISTRHO Plugin Framework
github.com / falkTX / DPF

2. DPF · DISTRHO Plugin Framework [*] Except liblo for DSSI UIs.
C++ “mini” framework for building audio plugins (cross-platform)
Very small code size
No external dependencies [*]
Permissive license (ISC)
[*] Except liblo for DSSI UIs.

3. DPF · DISTRHO Plugin Framework
WHY
Many plugin formats to support
Not always easy to understand
No high-level C++ abstractions
Similar projects without liberal license
or Linux support
VST SDK issues

4. DPF · DISTRHO Plugin Framework
HOW DOES IT WORK?
Internal, simple C++ API
Exports to all possible formats
UIs made with OpenGL, pugl
(includes base classes for easy startup)
All format specific things hidden

5. DPF · DISTRHO Plugin Framework
WHAT CAN IT DO?
Effects, Synths and Utilities
LADSPA, DSSI, LV2 and VST2 formats
Parameters, presets and states
UI to DSP communication
Time information from host [*]
Linux, Mac and Windows builds
[*] Not available in LADSPA and DSSI formats.

6. DPF · DISTRHO Plugin Framework
WHAT CAN IT *NOT* DO?
MIDI output (so no MIDI filters, yet)
DSP to UI communication [*]
Advanced per-format stuff
[*] Direct access in the UI to the DSP instance is possible, but NOT recommended! (also not available for DSSI)

7. DPF · DISTRHO Plugin Framework
FUTURE PLANS
Cleanup
Documentation
Stabilize API (specially UI stuff)
Later: Fonts, Menus, File-Browser/Dialogs

8. DPF · DISTRHO Plugin Framework
EXAMPLE CODE (Part 1/3)
FILE: DistrhoPluginInfo.h (Plugin data macros)
#define DISTRHO_PLUGIN_NAME "My EQ"
#define DISTRHO_PLUGIN_HAS_UI
#define DISTRHO_PLUGIN_IS_SYNTH
#define DISTRHO_PLUGIN_NUM_INPUTS 2
#define DISTRHO_PLUGIN_NUM_OUTPUTS 2
#define DISTRHO_PLUGIN_WANT_LATENCY 0
#define DISTRHO_PLUGIN_WANT_PROGRAMS 0
#define DISTRHO_PLUGIN_WANT_STATE 0
#define DISTRHO_PLUGIN_WANT_TIMEPOS 0
#define DISTRHO_PLUGIN_URI "

9. DPF · DISTRHO Plugin Framework
EXAMPLE CODE (Part 2/3)
FILE: MyEQ.hpp (Plugin DSP header)
class MyEQ : public Plugin {
public:
MyEQ();
// Information
const char* d_getLabel() const noexcept { return "3BandEQ"; }
const char* d_getMaker() const noexcept { return "DISTRHO"; }
const char* d_getLicense() const noexcept { return "LGPL"; }
uint32_t d_getVersion() const noexcept { return 0x1000; }
long d_getUniqueId() const noexcept { return ; }
// Parameters
void d_initParameter(uint32_t index, Parameter& parameter);
float d_getParameterValue(uint32_t index) const;
void d_setParameterValue(uint32_t index, float value);
// Process
void d_run(float** inputs, float** outputs, uint32_t frames); };

10. DPF · DISTRHO Plugin Framework
EXAMPLE CODE (Part 3/3)
FILE: MyEQUI.hpp (Plugin UI header)
class MyEQUI : public UI,
public ImageKnob::Callback {
public:
MyEQUI();
// Information
uint d_getWidth() const noexcept { return 330; }
uint d_getHeight() const noexcept { return 220; }
// DSP Callbacks
void d_parameterChanged(uint32_t index, float value);
// Widget Callbacks
void imageKnobValueChanged(ImageKnob* knob, float value);
void onDisplay();
private:
ImageKnob* knob; };

11. DPF · DISTRHO Plugin Framework
Demo
Questions
If you want to quickly check some DPF based plugins, see:
github.com/zamaudio/zam-plugins-DPF