Add LV2 plugin

.build.yml

@@ -5,6 +5,7 @@ packages:
   - libsndfile1-dev
   - libfftw3-dev
   - ladspa-sdk
+  - lv2
   - vamp-plugin-sdk
   - meson
   - ninja-build

ladspa-lv2/RubberBandPitchShifter.cpp

@@ -35,6 +35,8 @@ using std::cerr;
 using std::endl;
 using std::min;
 
+#ifdef RB_PLUGIN_LADSPA
+
 const char *const
 RubberBandPitchShifter::portNamesMono[PortCountMono] =
 {
@@ -185,13 +187,13 @@ RubberBandPitchShifter::ladspaDescriptorMono =
     portsMono,
     portNamesMono,
     hintsMono,
-    0, // Implementation data
+    nullptr, // Implementation data
     instantiate,
     connectPort,
     activate,
     run,
-    0, // Run adding
-    0, // Set run adding gain
+    nullptr, // Run adding
+    nullptr, // Set run adding gain
     deactivate,
     cleanup
 };
@@ -209,13 +211,13 @@ RubberBandPitchShifter::ladspaDescriptorStereo =
     portsStereo,
     portNamesStereo,
     hintsStereo,
-    0, // Implementation data
+    nullptr, // Implementation data
     instantiate,
     connectPort,
     activate,
     run,
-    0, // Run adding
-    0, // Set run adding gain
+    nullptr, // Run adding
+    nullptr, // Set run adding gain
     deactivate,
     cleanup
 };
@@ -228,14 +230,52 @@ RubberBandPitchShifter::getDescriptor(unsigned long index)
     else return 0;
 }
 
+#else
+
+const LV2_Descriptor
+RubberBandPitchShifter::lv2DescriptorMono =
+{
+    "http://breakfastquay.com/rdf/lv2-rubberband#mono",
+    instantiate,
+    connectPort,
+    activate,
+    run,
+    deactivate,
+    cleanup,
+    nullptr
+};
+
+const LV2_Descriptor
+RubberBandPitchShifter::lv2DescriptorStereo =
+{
+    "http://breakfastquay.com/rdf/lv2-rubberband#stereo",
+    instantiate,
+    connectPort,
+    activate,
+    run,
+    deactivate,
+    cleanup,
+    nullptr
+};
+
+const LV2_Descriptor *
+RubberBandPitchShifter::getDescriptor(uint32_t index)
+{
+    if (index == 0) return &lv2DescriptorMono;
+    if (index == 1) return &lv2DescriptorStereo;
+    else return 0;
+}
+
+#endif
+
 RubberBandPitchShifter::RubberBandPitchShifter(int sampleRate, size_t channels) :
-    m_latency(0),
-    m_cents(0),
-    m_semitones(0),
-    m_octaves(0),
-    m_crispness(0),
-    m_formant(0),
-    m_wetDry(0),
+    m_latency(nullptr),
+    m_cents(nullptr),
+    m_semitones(nullptr),
+    m_octaves(nullptr),
+    m_crispness(nullptr),
+    m_formant(nullptr),
+    m_wetDry(nullptr),
     m_ratio(1.0),
     m_prevRatio(1.0),
     m_currentCrispness(-1),
@@ -257,6 +297,7 @@ RubberBandPitchShifter::RubberBandPitchShifter(int sampleRate, size_t channels)
     m_outputBuffer = new RingBuffer<float> *[m_channels];
     m_delayMixBuffer = new RingBuffer<float> *[m_channels];
     m_scratch = new float *[m_channels];
+    m_inptrs = new float *[m_channels];
     
     m_bufsize = m_blockSize + m_reserve + 8192;
 
@@ -272,6 +313,8 @@ RubberBandPitchShifter::RubberBandPitchShifter(int sampleRate, size_t channels)
         for (size_t i = 0; i < m_bufsize; ++i) {
             m_scratch[c][i] = 0.f;
         }
+
+        m_inptrs[c] = 0;
     }
 
     activateImpl();
@@ -287,11 +330,14 @@ RubberBandPitchShifter::~RubberBandPitchShifter()
     }
     delete[] m_outputBuffer;
     delete[] m_delayMixBuffer;
+    delete[] m_inptrs;
     delete[] m_scratch;
     delete[] m_output;
     delete[] m_input;
 }
 
+#ifdef RB_PLUGIN_LADSPA
+
 LADSPA_Handle
 RubberBandPitchShifter::instantiate(const LADSPA_Descriptor *desc, unsigned long rate)
 {
@@ -300,12 +346,43 @@ RubberBandPitchShifter::instantiate(const LADSPA_Descriptor *desc, unsigned long
     } else if (desc->PortCount == ladspaDescriptorStereo.PortCount) {
         return new RubberBandPitchShifter(rate, 2);
     }
-    return 0;
+    return nullptr;
 }
 
+#else
+
+LV2_Handle
+RubberBandPitchShifter::instantiate(const LV2_Descriptor *desc, double rate,
+                                    const char *, const LV2_Feature *const *)
+{
+    if (rate < 1.0) {
+        std::cerr << "RubberBandPitchShifter::instantiate: invalid sample rate "
+                  << rate << " provided" << std::endl;
+        return nullptr;
+    }
+    size_t srate = size_t(round(rate));
+    if (std::string(desc->URI) == lv2DescriptorMono.URI) {
+        return new RubberBandPitchShifter(srate, 1);
+    } else if (std::string(desc->URI) == lv2DescriptorStereo.URI) {
+        return new RubberBandPitchShifter(srate, 2);
+    } else {
+        std::cerr << "RubberBandPitchShifter::instantiate: unrecognised URI "
+                  << desc->URI << " requested" << std::endl;
+        return nullptr;
+    }
+}
+
+#endif
+
+#ifdef RB_PLUGIN_LADSPA
 void
 RubberBandPitchShifter::connectPort(LADSPA_Handle handle,
 				    unsigned long port, LADSPA_Data *location)
+#else 
+void
+RubberBandPitchShifter::connectPort(LV2_Handle handle,
+				    uint32_t port, void *location)
+#endif
 {
     RubberBandPitchShifter *shifter = (RubberBandPitchShifter *)handle;
 
@@ -336,19 +413,58 @@ RubberBandPitchShifter::connectPort(LADSPA_Handle handle,
     }
 }
 
+#ifdef RB_PLUGIN_LADSPA
+void
+RubberBandPitchShifter::activate(LADSPA_Handle handle)
+#else
+void
+RubberBandPitchShifter::activate(LV2_Handle handle)
+#endif
+{
+    RubberBandPitchShifter *shifter = (RubberBandPitchShifter *)handle;
+    shifter->activateImpl();
+}
+
+#ifdef RB_PLUGIN_LADSPA
+void
+RubberBandPitchShifter::run(LADSPA_Handle handle, unsigned long samples)
+#else
+void
+RubberBandPitchShifter::run(LV2_Handle handle, uint32_t samples)
+#endif
+{
+    RubberBandPitchShifter *shifter = (RubberBandPitchShifter *)handle;
+    shifter->runImpl(samples);
+}
+
+#ifdef RB_PLUGIN_LADSPA
+void
+RubberBandPitchShifter::deactivate(LADSPA_Handle handle)
+#else
+void
+RubberBandPitchShifter::deactivate(LV2_Handle handle)
+#endif
+{
+    activate(handle); // both functions just reset the plugin
+}
+
+#ifdef RB_PLUGIN_LADSPA
+void
+RubberBandPitchShifter::cleanup(LADSPA_Handle handle)
+#else
+void
+RubberBandPitchShifter::cleanup(LV2_Handle handle)
+#endif
+{
+    delete (RubberBandPitchShifter *)handle;
+}
+
 int
 RubberBandPitchShifter::getLatency() const
 {
     return m_reserve;
 }
 
-void
-RubberBandPitchShifter::activate(LADSPA_Handle handle)
-{
-    RubberBandPitchShifter *shifter = (RubberBandPitchShifter *)handle;
-    shifter->activateImpl();
-}
-
 void
 RubberBandPitchShifter::activateImpl()
 {
@@ -377,13 +493,6 @@ RubberBandPitchShifter::activateImpl()
     m_stretcher->process(m_scratch, m_reserve, false);
 }
 
-void
-RubberBandPitchShifter::run(LADSPA_Handle handle, unsigned long samples)
-{
-    RubberBandPitchShifter *shifter = (RubberBandPitchShifter *)handle;
-    shifter->runImpl(samples);
-}
-
 void
 RubberBandPitchShifter::updateRatio()
 {
@@ -443,9 +552,9 @@ RubberBandPitchShifter::updateFormant()
 }
 
 void
-RubberBandPitchShifter::runImpl(unsigned long insamples)
+RubberBandPitchShifter::runImpl(uint32_t insamples)
 {
-    unsigned long offset = 0;
+    size_t offset = 0;
 
     // We have to break up the input into chunks like this because
     // insamples could be arbitrarily large and our output buffer is
@@ -453,22 +562,24 @@ RubberBandPitchShifter::runImpl(unsigned long insamples)
 
     while (offset < insamples) {
 
-        unsigned long block = (unsigned long)m_blockSize;
-        if (block + offset > insamples) block = insamples - offset;
+        size_t block = m_blockSize;
+        if (offset + block > insamples) {
+            block = insamples - offset;
+        }
 
         runImpl(block, offset);
 
         offset += block;
     }
 
-    if (m_wetDry) {
     for (size_t c = 0; c < m_channels; ++c) {
         m_delayMixBuffer[c]->write(m_input[c], insamples);
     }
-        float mix = *m_wetDry;
+    float mix = 0.0;
+    if (m_wetDry) mix = *m_wetDry;
     for (size_t c = 0; c < m_channels; ++c) {
         if (mix > 0.0) {
-                for (unsigned long i = 0; i < insamples; ++i) {
+            for (size_t i = 0; i < insamples; ++i) {
                 float dry = m_delayMixBuffer[c]->readOne();
                 m_output[c][i] *= (1.0 - mix);
                 m_output[c][i] += dry * mix;
@@ -478,10 +589,9 @@ RubberBandPitchShifter::runImpl(unsigned long insamples)
         }
     }
 }
-}
 
 void
-RubberBandPitchShifter::runImpl(unsigned long insamples, unsigned long offset)
+RubberBandPitchShifter::runImpl(uint32_t insamples, uint32_t offset)
 {
     updateRatio();
     if (m_ratio != m_prevRatio) {
@@ -500,8 +610,6 @@ RubberBandPitchShifter::runImpl(unsigned long insamples, unsigned long offset)
     int processed = 0;
     size_t outTotal = 0;
 
-    float *ptrs[2];
-
     while (processed < samples) {
 
         // never feed more than the minimum necessary number of
@@ -510,10 +618,13 @@ RubberBandPitchShifter::runImpl(unsigned long insamples, unsigned long offset)
 
         int toCauseProcessing = m_stretcher->getSamplesRequired();
         int inchunk = min(samples - processed, toCauseProcessing);
+
         for (size_t c = 0; c < m_channels; ++c) {
-            ptrs[c] = &(m_input[c][offset + processed]);
+            m_inptrs[c] = &(m_input[c][offset + processed]);
         }
-        m_stretcher->process(ptrs, inchunk, false);
+
+        m_stretcher->process(m_inptrs, inchunk, false);
+
         processed += inchunk;
 
         int avail = m_stretcher->available();
@@ -549,15 +660,3 @@ RubberBandPitchShifter::runImpl(unsigned long insamples, unsigned long offset)
     }
 }
 
-void
-RubberBandPitchShifter::deactivate(LADSPA_Handle handle)
-{
-    activate(handle); // both functions just reset the plugin
-}
-
-void
-RubberBandPitchShifter::cleanup(LADSPA_Handle handle)
-{
-    delete (RubberBandPitchShifter *)handle;
-}
-

ladspa-lv2/RubberBandPitchShifter.h

@@ -24,7 +24,21 @@
 #ifndef RUBBERBAND_PITCH_SHIFTER_H
 #define RUBBERBAND_PITCH_SHIFTER_H
 
+#ifdef RB_PLUGIN_LADSPA
+#ifdef RB_PLUGIN_LV2
+#error "Only one of RB_PLUGIN_LADSPA and RB_PLUGIN_LV2 may be defined at once"
+#endif
+#else
+#ifndef RB_PLUGIN_LV2
+#error "Including code must define either RB_PLUGIN_LADSPA or RB_PLUGIN_LV2"
+#endif
+#endif
+
+#ifdef RB_PLUGIN_LADSPA
 #include <ladspa.h>
+#else
+#include <lv2.h>
+#endif
 
 #include "base/RingBuffer.h"
 
@@ -35,7 +49,11 @@ class RubberBandStretcher;
 class RubberBandPitchShifter
 {
 public:
+#ifdef RB_PLUGIN_LADSPA
     static const LADSPA_Descriptor *getDescriptor(unsigned long index);
+#else
+    static const LV2_Descriptor *getDescriptor(uint32_t index);
+#endif
     
 protected:
     RubberBandPitchShifter(int sampleRate, size_t channels);
@@ -43,9 +61,9 @@ protected:
 
     enum {
         LatencyPort      = 0,
-	OctavesPort      = 1,
+	CentsPort        = 1,
 	SemitonesPort    = 2,
-	CentsPort        = 3,
+	OctavesPort      = 3,
         CrispnessPort    = 4,
 	FormantPort      = 5,
 	WetDryPort       = 6,
@@ -57,6 +75,7 @@ protected:
         PortCountStereo  = OutputPort2 + 1
     };
 
+#ifdef RB_PLUGIN_LADSPA
     static const char *const portNamesMono[PortCountMono];
     static const LADSPA_PortDescriptor portsMono[PortCountMono];
     static const LADSPA_PortRangeHint hintsMono[PortCountMono];
@@ -77,9 +96,24 @@ protected:
     static void deactivate(LADSPA_Handle);
     static void cleanup(LADSPA_Handle);
 
+#else
+
+    static const LV2_Descriptor lv2DescriptorMono;
+    static const LV2_Descriptor lv2DescriptorStereo;
+    
+    static LV2_Handle instantiate(const LV2_Descriptor *, double,
+                                  const char *, const LV2_Feature *const *);
+    static void connectPort(LV2_Handle, uint32_t, void *);
+    static void activate(LV2_Handle);
+    static void run(LV2_Handle, uint32_t);
+    static void deactivate(LV2_Handle);
+    static void cleanup(LV2_Handle);
+
+#endif
+    
     void activateImpl();
-    void runImpl(unsigned long);
-    void runImpl(unsigned long, unsigned long offset);
+    void runImpl(uint32_t count);
+    void runImpl(uint32_t count, uint32_t offset);
     void updateRatio();
     void updateCrispness();
     void updateFormant();
@@ -109,6 +143,7 @@ protected:
     RubberBand::RingBuffer<float> **m_outputBuffer;
     RubberBand::RingBuffer<float> **m_delayMixBuffer;
     float **m_scratch;
+    float **m_inptrs;
 
     int m_sampleRate;
     size_t m_channels;

ladspa-lv2/libmain-ladspa.cpp

@@ -21,7 +21,9 @@
     you must obtain a valid commercial licence before doing so.
 */
 
-#include "RubberBandPitchShifter.h"
+#define RB_PLUGIN_LADSPA 1
+#undef RB_PLUGIN_LV2
+#include "RubberBandPitchShifter.cpp"
 
 #include <stdio.h>
 

ladspa-lv2/libmain-lv2.cpp

@@ -0,0 +1,37 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rubber Band Library
+    An audio time-stretching and pitch-shifting library.
+    Copyright 2007-2022 Particular Programs Ltd.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+
+    Alternatively, if you have a valid commercial licence for the
+    Rubber Band Library obtained by agreement with the copyright
+    holders, you may redistribute and/or modify it under the terms
+    described in that licence.
+
+    If you wish to distribute code using the Rubber Band Library
+    under terms other than those of the GNU General Public License,
+    you must obtain a valid commercial licence before doing so.
+*/
+
+#define RB_PLUGIN_LV2 1
+#undef RB_PLUGIN_LADSPA
+#include "RubberBandPitchShifter.cpp"
+
+#include <stdio.h>
+
+extern "C" {
+
+const LV2_Descriptor *lv2_descriptor(uint32_t index)
+{
+    return RubberBandPitchShifter::getDescriptor(index);
+}
+
+}

ladspa-lv2/lv2-plugin.list

@@ -0,0 +1 @@
+_lv2_descriptor

ladspa-lv2/lv2-plugin.map

@@ -0,0 +1,4 @@
+{
+	global: lv2_descriptor;
+	local: *;
+};

ladspa-lv2/rubberband.lv2/lv2-rubberband.ttl

@@ -0,0 +1,200 @@
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix dc: <http://purl.org/dc/terms/> .
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
+@prefix pg: <http://lv2plug.in/ns/ext/port-groups#> .
+@prefix rubberband: <http://breakfastquay.com/rdf/lv2-rubberband#> .
+@prefix : <#> .
+
+:maker
+        a foaf:Agent, foaf:Person ;
+        foaf:name "Breakfast Quay" ;
+        foaf:homepage <https://breakfastquay.com/> ;
+        foaf:mbox <mailto:chris.cannam@breakfastquay.com> .
+
+:latencyPort
+        a lv2:ControlPort, lv2:OutputPort ;
+        lv2:index 0 ;
+        lv2:symbol "latency" ;
+        lv2:name "Latency" ;
+        lv2:designation lv2:latency ;
+        lv2:portProperty lv2:integer, lv2:reportsLatency .
+
+:centsPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 1 ;
+        lv2:symbol "cents" ;
+        lv2:name "Cents" ;
+        lv2:default 0 ;
+        lv2:minimum -100 ;
+        lv2:maximum 100 ;
+        lv2:portProperty lv2:integer .
+
+:semitonesPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 2 ;
+        lv2:symbol "semitones" ;
+        lv2:name "Semitones" ;
+        lv2:default 0 ;
+        lv2:minimum -12 ;
+        lv2:maximum 12 ;
+        lv2:portProperty lv2:integer .
+
+:octavesPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 3 ;
+        lv2:symbol "octaves" ;
+        lv2:name "Octaves" ;
+        lv2:default 0 ;
+        lv2:minimum -2 ;
+        lv2:maximum 2 ;
+        lv2:portProperty lv2:integer .
+
+:crispnessPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 4 ;
+        lv2:symbol "crispness" ;
+        lv2:name "Crispness" ;
+        lv2:default 3 ;
+        lv2:minimum 0 ;
+        lv2:maximum 3 ;
+        lv2:portProperty lv2:integer, lv2:enumeration ;
+        lv2:scalePoint [ rdfs:label "Smooth"; rdf:value 0 ] ;
+        lv2:scalePoint [ rdfs:label "Multitimbral"; rdf:value 1 ] ;
+        lv2:scalePoint [ rdfs:label "Two sources"; rdf:value 2 ] ;
+        lv2:scalePoint [ rdfs:label "Standard"; rdf:value 3 ] .
+
+:formantPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 5 ;
+        lv2:symbol "formant" ;
+        lv2:name "Formant Preserving" ;
+        lv2:default 0 ;
+        lv2:minimum 0 ;
+        lv2:maximum 1 ;
+        lv2:portProperty lv2:integer, lv2:toggled .
+
+:wetDryPort
+        a lv2:ControlPort, lv2:InputPort ;
+        lv2:index 6 ;
+        lv2:symbol "wetdry" ;
+        lv2:name "Wet-Dry Mix" ;
+        lv2:default 0 ;
+        lv2:minimum 0 ;
+        lv2:maximum 1 .
+
+rubberband:mono_in_group
+        a pg:MonoGroup, pg:InputGroup ;
+        lv2:symbol "mono_in" ;
+        rdfs:label "Mono Input" .
+
+rubberband:mono_out_group
+        a pg:MonoGroup, pg:OutputGroup ;
+        lv2:symbol "mono_out" ;
+        rdfs:label "Mono Output" .
+
+rubberband:stereo_in_group
+        a pg:StereoGroup, pg:InputGroup ;
+        lv2:symbol "stereo_in" ;
+        rdfs:label "Stereo Input" .
+
+rubberband:stereo_out_group
+        a pg:StereoGroup, pg:OutputGroup ;
+        lv2:symbol "stereo_out" ;
+        rdfs:label "Stereo Output" .
+
+rubberband:mono
+        a doap:Project, lv2:Plugin, lv2:PitchPlugin ;
+        doap:name "Rubber Band Mono Pitch Shifter" ;
+        doap:license <http://usefulinc.com/doap/licenses/gpl> ;
+        foaf:maker :maker ;
+        doap:developer :maker ;
+        doap:maintainer :maker ;
+        # Minor version will be 2x the Rubber Band API minor version,
+        # but this is an initial test release, so 0
+        lv2:minorVersion 0 ;
+        lv2:microVersion 0 ;
+        lv2:optionalFeature lv2:hardRTCapable ;
+	pg:mainInput rubberband:mono_in_group ;
+	pg:mainOutput rubberband:mono_out_group ;
+        dc:replaces <urn:ladspa:2979> ;
+        lv2:port :latencyPort ,
+                 :centsPort ,
+                 :semitonesPort ,
+                 :octavesPort ,
+                 :crispnessPort ,
+                 :formantPort ,
+                 :wetDryPort ,
+                 [ a lv2:AudioPort, lv2:InputPort ;
+                   lv2:index 7 ;
+                   lv2:symbol "input" ;
+                   lv2:name "Input" ;
+                   lv2:shortName "Input" ;
+                   pg:group rubberband:mono_in_group ;
+                   lv2:designation pg:center ;
+                 ], [
+                   a lv2:AudioPort, lv2:OutputPort ;
+                   lv2:index 8 ;
+                   lv2:symbol "output" ;
+                   lv2:name "Output" ;
+                   lv2:shortName "Output" ;
+                   pg:group rubberband:mono_out_group ;
+                   lv2:designation pg:center ;
+                 ] .
+
+rubberband:stereo
+        a doap:Project, lv2:Plugin, lv2:PitchPlugin ;
+        doap:name "Rubber Band Stereo Pitch Shifter" ;
+        doap:license <http://usefulinc.com/doap/licenses/gpl> ;
+        foaf:maker :maker ;
+        doap:developer :maker ;
+        doap:maintainer :maker ;
+        # Minor version will be 2x the Rubber Band API minor version,
+        # but this is an initial test release, so 0
+        lv2:minorVersion 0 ;
+        lv2:microVersion 0 ;
+        lv2:optionalFeature lv2:hardRTCapable ;
+	pg:mainInput rubberband:stereo_in_group ;
+	pg:mainOutput rubberband:stereo_out_group ;
+        dc:replaces <urn:ladspa:9792> ;
+        lv2:port :latencyPort ,
+                 :centsPort ,
+                 :semitonesPort ,
+                 :octavesPort ,
+                 :crispnessPort ,
+                 :formantPort ,
+                 :wetDryPort ,
+                 [ a lv2:AudioPort, lv2:InputPort ;
+                   lv2:index 7 ;
+                   lv2:symbol "input_l" ;
+                   lv2:name "Input L" ;
+                   lv2:shortName "Input L" ;
+                   pg:group rubberband:stereo_in_group ;
+                   lv2:designation pg:left ;
+                 ], [
+                   a lv2:AudioPort, lv2:OutputPort ;
+                   lv2:index 8 ;
+                   lv2:symbol "output_l" ;
+                   lv2:name "Output L" ;
+                   lv2:shortName "Output L" ;
+                   pg:group rubberband:stereo_out_group ;
+                   lv2:designation pg:left ;
+                 ], [ a lv2:AudioPort, lv2:InputPort ;
+                   lv2:index 9 ;
+                   lv2:symbol "input_r" ;
+                   lv2:name "Input R" ;
+                   lv2:shortName "Input R" ;
+                   pg:group rubberband:stereo_in_group ;
+                   lv2:designation pg:right ;
+                 ], [
+                   a lv2:AudioPort, lv2:OutputPort ;
+                   lv2:index 10 ;
+                   lv2:symbol "output_r" ;
+                   lv2:name "Output R" ;
+                   lv2:shortName "Output R" ;
+                   pg:group rubberband:stereo_out_group ;
+                   lv2:designation pg:right ;
+                 ] .
+

ladspa-lv2/rubberband.lv2/manifest.ttl

@@ -0,0 +1,14 @@
+@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix rubberband: <http://breakfastquay.com/rdf/lv2-rubberband#> .
+
+rubberband:mono
+        a lv2:Plugin ;
+        lv2:binary <lv2-rubberband.so> ;
+        rdfs:seeAlso <lv2-rubberband.ttl> .
+
+rubberband:stereo
+        a lv2:Plugin ;
+        lv2:binary <lv2-rubberband.so> ;
+        rdfs:seeAlso <lv2-rubberband.ttl> .
+

meson.build

@@ -77,8 +77,11 @@ vamp_sources = [
 ]
 
 ladspa_sources = [
-  'ladspa/RubberBandPitchShifter.cpp',
-  'ladspa/libmain.cpp',
+  'ladspa-lv2/libmain-ladspa.cpp',
+]
+
+lv2_sources = [
+  'ladspa-lv2/libmain-lv2.cpp',
 ]
 
 general_include_dirs = [
@@ -100,6 +103,7 @@ sndfile_dep = dependency('sndfile', version: '>= 1.0.16', required: false)
 vamp_dep = dependency('vamp-sdk', version: '>= 2.9', required: false)
 thread_dep = dependency('threads')
 have_ladspa = cpp.has_header('ladspa.h', args: extra_include_args)
+have_lv2 = cpp.has_header('lv2.h', args: extra_include_args)
 have_sincos = cpp.has_function('sincos',
                                prefix: '#define _GNU_SOURCE\n#include <math.h>',
                                args: '-lm')
@@ -314,6 +318,7 @@ have_sndfile = sndfile_dep.found()
 # General platform and compiler expectations
 
 ladspa_symbol_args = []
+lv2_symbol_args = []
 vamp_symbol_args = []
 
 if get_option('buildtype').startswith('release')
@@ -326,7 +331,10 @@ endif
 if system == 'darwin'
   feature_defines += ['-DUSE_PTHREADS', '-DMALLOC_IS_ALIGNED']
   ladspa_symbol_args += [
-    '-exported_symbols_list', meson.current_source_dir() / 'ladspa/ladspa-plugin.list'
+    '-exported_symbols_list', meson.current_source_dir() / 'ladspa-lv2/ladspa-plugin.list'
+  ]
+  lv2_symbol_args += [
+    '-exported_symbols_list', meson.current_source_dir() / 'ladspa-lv2/lv2-plugin.list'
   ]
   vamp_symbol_args += [
     '-exported_symbols_list', meson.current_source_dir() / 'vamp/vamp-plugin.list'
@@ -373,13 +381,17 @@ elif system == 'windows'
   feature_defines += ['-D_WIN32', '-DNOMINMAX', '-D_USE_MATH_DEFINES', '-DGETOPT_API=']
   if cpp.get_id() == 'msvc'
     ladspa_symbol_args += ['-EXPORT:ladspa_descriptor']
+    lv2_symbol_args += ['-EXPORT:lv2_descriptor']
     vamp_symbol_args += ['-EXPORT:vampGetPluginDescriptor']
   endif
 
 else # system not darwin or windows
   feature_defines += ['-DUSE_PTHREADS', '-DHAVE_POSIX_MEMALIGN']
   ladspa_symbol_args += [
-    '-Wl,--version-script=' + meson.current_source_dir() / 'ladspa/ladspa-plugin.map'
+    '-Wl,--version-script=' + meson.current_source_dir() / 'ladspa-lv2/ladspa-plugin.map'
+  ]
+  lv2_symbol_args += [
+    '-Wl,--version-script=' + meson.current_source_dir() / 'ladspa-lv2/lv2-plugin.map'
   ]
   vamp_symbol_args += [
     '-Wl,--version-script=' + meson.current_source_dir() / 'vamp/vamp-plugin.map'
@@ -417,6 +429,7 @@ if cpp.get_id() == 'msvc'
   rubberband_library_name = 'rubberband'
   rubberband_program_name = 'rubberband-program'
   rubberband_ladspa_name = 'ladspa-rubberband'
+  rubberband_lv2_name = 'lv2-rubberband'
   rubberband_vamp_name = 'vamp-rubberband'
   rubberband_jni_name = 'rubberband-jni'
 else
@@ -424,6 +437,7 @@ else
   rubberband_dynamic_name = 'rubberband'
   rubberband_program_name = 'rubberband'
   rubberband_ladspa_name = 'ladspa-rubberband'
+  rubberband_lv2_name = 'lv2-rubberband'
   rubberband_vamp_name = 'vamp-rubberband'
   rubberband_jni_name = 'rubberband-jni'
 endif  
@@ -446,7 +460,7 @@ rubberband_objlib_dep = declare_dependency(
 
 
 # And the build targets: Static and dynamic libraries, command-line
-# utility, LADSPA plugin, Vamp plugin, JNI library
+# utility, LADSPA and LV2 plugins, Vamp plugin, JNI library
 
 if get_option('default_library') == 'shared'
   message('Not building Rubber Band Library static library: default_library option is set to shared')
@@ -573,11 +587,11 @@ if have_ladspa
     install_dir: get_option('libdir') / 'ladspa',
   )
   install_data(
-    'ladspa/ladspa-rubberband.cat',
+    'ladspa-lv2/ladspa-rubberband.cat',
     install_dir: get_option('libdir') / 'ladspa',
   )
   install_data(
-    'ladspa/ladspa-rubberband.rdf',
+    'ladspa-lv2/ladspa-rubberband.rdf',
     install_dir: get_option('datadir') / 'ladspa/rdf',
   )
 else
@@ -585,6 +599,33 @@ else
   message('Not building LADSPA plugin: ladspa.h header not found')
 endif
 
+if have_lv2
+  target_summary += { 'LV2 plugin': [ true, 'Name: ' + rubberband_lv2_name ] }
+  message('Will build LV2 plugin')
+  rubberband_lv2 = shared_library(
+    rubberband_lv2_name,
+    lv2_sources,
+    include_directories: general_include_dirs,
+    cpp_args: general_compile_args,
+    c_args: general_compile_args,
+    link_args: [
+      arch_flags,
+      feature_libraries,
+      lv2_symbol_args,
+    ],
+    dependencies: [
+      rubberband_objlib_dep,
+      general_dependencies,
+    ],
+    name_prefix: '',
+    install: true,
+    install_dir: get_option('libdir') / 'lv2',
+  )
+else
+  target_summary += { 'LV2 plugin': false }
+  message('Not building LV2 plugin: lv2.h header not found')
+endif
+
 if have_vamp
   target_summary += { 'Vamp plugin': [ true, 'Name: ' + rubberband_vamp_name ] }
   message('Will build Vamp plugin')

otherbuilds/deploy/source.sh

@@ -32,6 +32,12 @@ echo
 grep 'RUBBERBAND.*VERSION' rubberband/rubberband-c.h
 check "Are the above version and API versions (from the C header) correct?"
 echo
+echo "The LV2 plugin RDF should contain 2x the API minor version for minorVersion"
+echo "and an LV2-specific microVersion field, for the mono and stereo plugins."
+echo
+grep 'Version' ladspa-lv2/rubberband.lv2/rubberband.ttl
+check "Are the above minor and micro versions (from the LV2 plugin RDF) correct?"
+echo
 grep '^PROJECT_NUMBER' Doxyfile
 check "Is the above version (from Doxyfile) correct?"