DSSIPluginInstance.cpp

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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2006 Chris Cannam.
*/

#include <iostream>
#include <cassert>

#include "DSSIPluginInstance.h"
#include "PluginIdentifier.h"
#include "LADSPAPluginFactory.h"

//#define DEBUG_DSSI 1
//#define DEBUG_DSSI_PROCESS 1

#define EVENT_BUFFER_SIZE 1023

#ifdef DEBUG_DSSI
static std::ostream &operator<<(std::ostream& o, const QString &s)
{
    o << s.toLocal8Bit().data();
    return o;
}
#endif

DSSIPluginInstance::GroupMap DSSIPluginInstance::m_groupMap;
snd_seq_event_t **DSSIPluginInstance::m_groupLocalEventBuffers = 0;
size_t DSSIPluginInstance::m_groupLocalEventBufferCount = 0;
Scavenger<ScavengerArrayWrapper<snd_seq_event_t *> > DSSIPluginInstance::m_bufferScavenger(2, 10);
std::map<LADSPA_Handle, std::set<DSSIPluginInstance::NonRTPluginThread *> > DSSIPluginInstance::m_threads;


DSSIPluginInstance::DSSIPluginInstance(RealTimePluginFactory *factory,
                                       int clientId,
                                       QString identifier,
                                       int position,
                                       unsigned long sampleRate,
                                       size_t blockSize,
                                       int idealChannelCount,
                                       const DSSI_Descriptor* descriptor) :
    RealTimePluginInstance(factory, identifier),
    m_client(clientId),
    m_position(position),
    m_descriptor(descriptor),
    m_programCacheValid(false),
    m_eventBuffer(EVENT_BUFFER_SIZE),
    m_blockSize(blockSize),
    m_idealChannelCount(idealChannelCount),
    m_sampleRate(sampleRate),
    m_latencyPort(0),
    m_run(false),
    m_bypassed(false),
    m_grouped(false),
    m_haveLastEventSendTime(false)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::DSSIPluginInstance(" << identifier << ")"
              << std::endl;
#endif

    init();

    m_inputBuffers  = new sample_t*[m_audioPortsIn.size()];
    m_outputBuffers = new sample_t*[m_outputBufferCount];

    for (size_t i = 0; i < m_audioPortsIn.size(); ++i) {
        m_inputBuffers[i] = new sample_t[blockSize];
    }
    for (size_t i = 0; i < m_outputBufferCount; ++i) {
        m_outputBuffers[i] = new sample_t[blockSize];
    }

    m_ownBuffers = true;

    m_pending.lsb = m_pending.msb = m_pending.program = -1;

    instantiate(sampleRate);
    if (isOK()) {
        connectPorts();
        activate();
        initialiseGroupMembership();
    }
}

std::string
DSSIPluginInstance::getIdentifier() const
{
    return m_descriptor->LADSPA_Plugin->Label;
}

std::string
DSSIPluginInstance::getName() const
{
    return m_descriptor->LADSPA_Plugin->Name;
}

std::string 
DSSIPluginInstance::getDescription() const
{
    return "";
}

std::string
DSSIPluginInstance::getMaker() const
{
    return m_descriptor->LADSPA_Plugin->Maker;
}

int
DSSIPluginInstance::getPluginVersion() const
{
    return 1;
}

std::string
DSSIPluginInstance::getCopyright() const
{
    return m_descriptor->LADSPA_Plugin->Copyright;
}

DSSIPluginInstance::ParameterList
DSSIPluginInstance::getParameterDescriptors() const
{
    ParameterList list;
    LADSPAPluginFactory *f = dynamic_cast<LADSPAPluginFactory *>(m_factory);
    
    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i) {
        
        ParameterDescriptor pd;
        unsigned int pn = m_controlPortsIn[i].first;

        pd.identifier = m_descriptor->LADSPA_Plugin->PortNames[pn];
        pd.name = pd.identifier;
        pd.description = "";
        pd.minValue = f->getPortMinimum(m_descriptor->LADSPA_Plugin, pn);
        pd.maxValue = f->getPortMaximum(m_descriptor->LADSPA_Plugin, pn);
        pd.defaultValue = f->getPortDefault(m_descriptor->LADSPA_Plugin, pn);

        float q = f->getPortQuantization(m_descriptor->LADSPA_Plugin, pn);
        if (q == 0.0) {
            pd.isQuantized = false;
        } else {
            pd.isQuantized = true;
            pd.quantizeStep = q;
        }

        list.push_back(pd);
    }

    return list;
}

float
DSSIPluginInstance::getParameter(std::string id) const
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::getParameter(" << id << ")" << std::endl;
#endif
    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i) {
        if (id == m_descriptor->LADSPA_Plugin->PortNames[m_controlPortsIn[i].first]) {
#ifdef DEBUG_DSSI
            std::cerr << "Matches port " << i << std::endl;
#endif
            float v = getParameterValue(i);
#ifdef DEBUG_DSSI
            std::cerr << "Returning " << v << std::endl;
#endif
            return v;
        }
    }

    return 0.0;
}

void
DSSIPluginInstance::setParameter(std::string id, float value)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::setParameter(" << id << ", " << value << ")" << std::endl;
#endif

    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i) {
        if (id == m_descriptor->LADSPA_Plugin->PortNames[m_controlPortsIn[i].first]) {
            setParameterValue(i, value);
            break;
        }
    }
}    

void
DSSIPluginInstance::init()
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::init" << std::endl;
#endif

    // Discover ports numbers and identities
    //
    const LADSPA_Descriptor *descriptor = m_descriptor->LADSPA_Plugin;

    for (unsigned long i = 0; i < descriptor->PortCount; ++i)
    {
        if (LADSPA_IS_PORT_AUDIO(descriptor->PortDescriptors[i]))
        {
            if (LADSPA_IS_PORT_INPUT(descriptor->PortDescriptors[i])) {
                m_audioPortsIn.push_back(i);
            } else {
                m_audioPortsOut.push_back(i);
            }
        }
        else
        if (LADSPA_IS_PORT_CONTROL(descriptor->PortDescriptors[i]))
        {
            if (LADSPA_IS_PORT_INPUT(descriptor->PortDescriptors[i])) {

                LADSPA_Data *data = new LADSPA_Data(0.0);

                m_controlPortsIn.push_back(std::pair<unsigned long, LADSPA_Data*>
                                           (i, data));

                m_backupControlPortsIn.push_back(0.0);

            } else {
                LADSPA_Data *data = new LADSPA_Data(0.0);
                m_controlPortsOut.push_back(
                    std::pair<unsigned long, LADSPA_Data*>(i, data));
                if (!strcmp(descriptor->PortNames[i], "latency") ||
                    !strcmp(descriptor->PortNames[i], "_latency")) {
#ifdef DEBUG_DSSI
                    std::cerr << "Wooo! We have a latency port!" << std::endl;
#endif
                    m_latencyPort = data;
                }
            }
        }
#ifdef DEBUG_DSSI
        else
            std::cerr << "DSSIPluginInstance::DSSIPluginInstance - "
                      << "unrecognised port type" << std::endl;
#endif
    }

    m_outputBufferCount = std::max(m_idealChannelCount, m_audioPortsOut.size());
}

size_t
DSSIPluginInstance::getLatency()
{
    size_t latency = 0;

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::getLatency(): m_latencyPort " << m_latencyPort << ", m_run " << m_run << std::endl;
#endif

    if (m_latencyPort) {
        if (!m_run) {
            for (size_t i = 0; i < getAudioInputCount(); ++i) {
                for (size_t j = 0; j < m_blockSize; ++j) {
                    m_inputBuffers[i][j] = 0.f;
                }
            }
            run(Vamp::RealTime::zeroTime);
        }
        latency = (size_t)(*m_latencyPort + 0.1);
    }
    
#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::getLatency(): latency is " << latency << std::endl;
#endif

    return latency;
}

void
DSSIPluginInstance::silence()
{
    if (m_instanceHandle != 0) {
        deactivate();
        activate();
    }
}

void
DSSIPluginInstance::discardEvents()
{
    m_eventBuffer.reset();
}

void
DSSIPluginInstance::setIdealChannelCount(size_t channels)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::setIdealChannelCount: channel count "
              << channels << " (was " << m_idealChannelCount << ")" << std::endl;
#endif

    if (channels == m_idealChannelCount) {
        silence();
        return;
    }

    if (m_instanceHandle != 0) {
        deactivate();
    }

    m_idealChannelCount = channels;

    if (channels > m_outputBufferCount) {

        for (size_t i = 0; i < m_outputBufferCount; ++i) {
            delete[] m_outputBuffers[i];
        }

        delete[] m_outputBuffers;

        m_outputBufferCount = channels;

        m_outputBuffers = new sample_t*[m_outputBufferCount];

        for (size_t i = 0; i < m_outputBufferCount; ++i) {
            m_outputBuffers[i] = new sample_t[m_blockSize];
        }

        connectPorts();
    }

    if (m_instanceHandle != 0) {
        activate();
    }
}

void
DSSIPluginInstance::detachFromGroup()
{
    if (!m_grouped) return;
    m_groupMap[m_identifier].erase(this);
    m_grouped = false;
}

void
DSSIPluginInstance::initialiseGroupMembership()
{
    if (!m_descriptor->run_multiple_synths) {
        m_grouped = false;
        return;
    }


    size_t pluginsInGroup = m_groupMap[m_identifier].size();

    if (++pluginsInGroup > m_groupLocalEventBufferCount) {

        size_t nextBufferCount = pluginsInGroup * 2;

        snd_seq_event_t **eventLocalBuffers = new snd_seq_event_t *[nextBufferCount];

        for (size_t i = 0; i < m_groupLocalEventBufferCount; ++i) {
            eventLocalBuffers[i] = m_groupLocalEventBuffers[i];
        }
        for (size_t i = m_groupLocalEventBufferCount; i < nextBufferCount; ++i) {
            eventLocalBuffers[i] = new snd_seq_event_t[EVENT_BUFFER_SIZE];
        }

        if (m_groupLocalEventBuffers) {
            m_bufferScavenger.claim(new ScavengerArrayWrapper<snd_seq_event_t *>
                                    (m_groupLocalEventBuffers));
        }

        m_groupLocalEventBuffers = eventLocalBuffers;
        m_groupLocalEventBufferCount = nextBufferCount;
    }

    m_grouped = true;
    m_groupMap[m_identifier].insert(this);
}

DSSIPluginInstance::~DSSIPluginInstance()
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::~DSSIPluginInstance" << std::endl;
#endif

    if (m_threads.find(m_instanceHandle) != m_threads.end()) {

        for (std::set<NonRTPluginThread *>::iterator i =
                 m_threads[m_instanceHandle].begin();
             i != m_threads[m_instanceHandle].end(); ++i) {

            (*i)->setExiting();
            (*i)->wait();
            delete *i;
        }

        m_threads.erase(m_instanceHandle);
    }

    detachFromGroup();

    if (m_instanceHandle != 0) {
        deactivate();
    }

    cleanup();

    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i)
        delete m_controlPortsIn[i].second;

    for (unsigned int i = 0; i < m_controlPortsOut.size(); ++i)
        delete m_controlPortsOut[i].second;

    m_controlPortsIn.clear();
    m_controlPortsOut.clear();

    if (m_ownBuffers) {
        for (size_t i = 0; i < m_audioPortsIn.size(); ++i) {
            delete[] m_inputBuffers[i];
        }
        for (size_t i = 0; i < m_outputBufferCount; ++i) {
            delete[] m_outputBuffers[i];
        }

        delete[] m_inputBuffers;
        delete[] m_outputBuffers;
    }

    m_audioPortsIn.clear();
    m_audioPortsOut.clear();
}


void
DSSIPluginInstance::instantiate(unsigned long sampleRate)
{
#ifdef DEBUG_DSSI
    std::cout << "DSSIPluginInstance::instantiate - plugin \"unique\" id = "
              << m_descriptor->LADSPA_Plugin->UniqueID << std::endl;
#endif
    if (!m_descriptor) return;

    const LADSPA_Descriptor *descriptor = m_descriptor->LADSPA_Plugin;

    if (!descriptor->instantiate) {
        std::cerr << "Bad plugin: plugin id " << descriptor->UniqueID
                  << ":" << descriptor->Label
                  << " has no instantiate method!" << std::endl;
        return;
    }

    m_instanceHandle = descriptor->instantiate(descriptor, sampleRate);

    if (m_instanceHandle) {

        if (m_descriptor->get_midi_controller_for_port) {

            for (unsigned long i = 0; i < descriptor->PortCount; ++i) {

                if (LADSPA_IS_PORT_CONTROL(descriptor->PortDescriptors[i]) &&
                    LADSPA_IS_PORT_INPUT(descriptor->PortDescriptors[i])) {

                    int controller = m_descriptor->get_midi_controller_for_port
                        (m_instanceHandle, i);

                    if (controller != 0 && controller != 32 &&
                        DSSI_IS_CC(controller)) {

                        m_controllerMap[DSSI_CC_NUMBER(controller)] = i;
                    }
                }
            }
        }
    }
}

void
DSSIPluginInstance::checkProgramCache() const
{
    if (m_programCacheValid) return;
    m_cachedPrograms.clear();

#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::checkProgramCache" << std::endl;
#endif

    if (!m_descriptor || !m_descriptor->get_program) {
        m_programCacheValid = true;
        return;
    }

    unsigned long index = 0;
    const DSSI_Program_Descriptor *programDescriptor;
    while ((programDescriptor = m_descriptor->get_program(m_instanceHandle, index))) {
        ++index;
        ProgramDescriptor d;
        d.bank = programDescriptor->Bank;
        d.program = programDescriptor->Program;
        d.name = programDescriptor->Name;
        m_cachedPrograms.push_back(d);
    }

#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::checkProgramCache: have " << m_cachedPrograms.size() << " programs" << std::endl;
#endif

    m_programCacheValid = true;
}

DSSIPluginInstance::ProgramList
DSSIPluginInstance::getPrograms() const
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::getPrograms" << std::endl;
#endif

    if (!m_descriptor) return ProgramList();

    checkProgramCache();

    ProgramList programs;

    for (std::vector<ProgramDescriptor>::iterator i = m_cachedPrograms.begin();
         i != m_cachedPrograms.end(); ++i) {
        programs.push_back(i->name);
    }

    return programs;
}

std::string
DSSIPluginInstance::getProgram(int bank, int program) const
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::getProgram(" << bank << "," << program << ")" << std::endl;
#endif

    if (!m_descriptor) return std::string();

    checkProgramCache();

    for (std::vector<ProgramDescriptor>::iterator i = m_cachedPrograms.begin();
         i != m_cachedPrograms.end(); ++i) {
        if (i->bank == bank && i->program == program) return i->name;
    }

    return std::string();
}

unsigned long
DSSIPluginInstance::getProgram(std::string name) const
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::getProgram(" << name << ")" << std::endl;
#endif

    if (!m_descriptor) return 0;

    checkProgramCache();

    unsigned long rv;

    for (std::vector<ProgramDescriptor>::iterator i = m_cachedPrograms.begin();
         i != m_cachedPrograms.end(); ++i) {
        if (i->name == name) {
            rv = i->bank;
            rv = (rv << 16) + i->program;
            return rv;
        }
    }

    return 0;
}

std::string
DSSIPluginInstance::getCurrentProgram() const
{
    return m_program;
}

void
DSSIPluginInstance::selectProgram(std::string program)
{
    selectProgramAux(program, true);
}

void
DSSIPluginInstance::selectProgramAux(std::string program, bool backupPortValues)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::selectProgram(" << program << ")" << std::endl;
#endif

    if (!m_descriptor) return;

    checkProgramCache();

    if (!m_descriptor->select_program) return;

    bool found = false;
    unsigned long bankNo = 0, programNo = 0;

    for (std::vector<ProgramDescriptor>::iterator i = m_cachedPrograms.begin();
         i != m_cachedPrograms.end(); ++i) {

        if (i->name == program) {

            bankNo = i->bank;
            programNo = i->program;
            found = true;

#ifdef DEBUG_DSSI
            std::cerr << "DSSIPluginInstance::selectProgram(" << program << "): found at bank " << bankNo << ", program " << programNo << std::endl;
#endif

            break;
        }
    }

    if (!found) return;
    m_program = program;

    // DSSI select_program is an audio context call
    m_processLock.lock();
    m_descriptor->select_program(m_instanceHandle, bankNo, programNo);
    m_processLock.unlock();

#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::selectProgram(" << program << "): made select_program(" << bankNo << "," << programNo << ") call" << std::endl;
#endif

    if (backupPortValues) {
        for (size_t i = 0; i < m_backupControlPortsIn.size(); ++i) {
            m_backupControlPortsIn[i] = *m_controlPortsIn[i].second;
        }
    }
}

void
DSSIPluginInstance::activate()
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::activate" << std::endl;
#endif

    if (!m_descriptor || !m_descriptor->LADSPA_Plugin->activate) return;
    m_descriptor->LADSPA_Plugin->activate(m_instanceHandle);

    if (m_program != "") {
#ifdef DEBUG_DSSI
        std::cerr << "DSSIPluginInstance::activate: restoring program " << m_program << std::endl;
#endif
        selectProgramAux(m_program, false);
    }

    for (size_t i = 0; i < m_backupControlPortsIn.size(); ++i) {
#ifdef DEBUG_DSSI
        std::cerr << "DSSIPluginInstance::activate: setting port " << m_controlPortsIn[i].first << " to " << m_backupControlPortsIn[i] << std::endl;
#endif
        *m_controlPortsIn[i].second = m_backupControlPortsIn[i];
    }
}

void
DSSIPluginInstance::connectPorts()
{
    if (!m_descriptor || !m_descriptor->LADSPA_Plugin->connect_port) return;
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::connectPorts: " << m_audioPortsIn.size() 
              << " audio ports in, " << m_audioPortsOut.size() << " out, "
              << m_outputBufferCount << " output buffers" << std::endl;
#endif

    assert(sizeof(LADSPA_Data) == sizeof(float));
    assert(sizeof(sample_t) == sizeof(float));
    
    LADSPAPluginFactory *f = dynamic_cast<LADSPAPluginFactory *>(m_factory);
    int inbuf = 0, outbuf = 0;

    for (unsigned int i = 0; i < m_audioPortsIn.size(); ++i) {
        m_descriptor->LADSPA_Plugin->connect_port
            (m_instanceHandle,
             m_audioPortsIn[i],
             (LADSPA_Data *)m_inputBuffers[inbuf]);
        ++inbuf;
    }

    for (unsigned int i = 0; i < m_audioPortsOut.size(); ++i) {
        m_descriptor->LADSPA_Plugin->connect_port
            (m_instanceHandle,
             m_audioPortsOut[i],
             (LADSPA_Data *)m_outputBuffers[outbuf]);
        ++outbuf;
    }

    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i) {
        m_descriptor->LADSPA_Plugin->connect_port
            (m_instanceHandle,
             m_controlPortsIn[i].first,
             m_controlPortsIn[i].second);

        if (f) {
            float defaultValue = f->getPortDefault
                (m_descriptor->LADSPA_Plugin, m_controlPortsIn[i].first);
            *m_controlPortsIn[i].second = defaultValue;
            m_backupControlPortsIn[i] = defaultValue;
#ifdef DEBUG_DSSI
            std::cerr << "DSSIPluginInstance::connectPorts: set control port " << i << " to default value " << defaultValue << std::endl;
#endif
        }
    }

    for (unsigned int i = 0; i < m_controlPortsOut.size(); ++i) {
        m_descriptor->LADSPA_Plugin->connect_port
            (m_instanceHandle,
             m_controlPortsOut[i].first,
             m_controlPortsOut[i].second);
    }
}

unsigned int
DSSIPluginInstance::getParameterCount() const
{
    return m_controlPortsIn.size();
}

void
DSSIPluginInstance::setParameterValue(unsigned int parameter, float value)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::setParameterValue(" << parameter << ") to " << value << std::endl;
#endif
    if (parameter >= m_controlPortsIn.size()) return;

    unsigned int portNumber = m_controlPortsIn[parameter].first;

    LADSPAPluginFactory *f = dynamic_cast<LADSPAPluginFactory *>(m_factory);
    if (f) {
        if (value < f->getPortMinimum(m_descriptor->LADSPA_Plugin, portNumber)) {
            value = f->getPortMinimum(m_descriptor->LADSPA_Plugin, portNumber);
        }
        if (value > f->getPortMaximum(m_descriptor->LADSPA_Plugin, portNumber)) {
            value = f->getPortMaximum(m_descriptor->LADSPA_Plugin, portNumber);
        }
    }

    (*m_controlPortsIn[parameter].second) = value;
    m_backupControlPortsIn[parameter] = value;
}

void
DSSIPluginInstance::setPortValueFromController(unsigned int port, int cv)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::setPortValueFromController(" << port << ") to " << cv << std::endl;
#endif

    const LADSPA_Descriptor *p = m_descriptor->LADSPA_Plugin;
    LADSPA_PortRangeHintDescriptor d = p->PortRangeHints[port].HintDescriptor;
    LADSPA_Data lb = p->PortRangeHints[port].LowerBound;
    LADSPA_Data ub = p->PortRangeHints[port].UpperBound;

    float value = (float)cv;

    if (!LADSPA_IS_HINT_BOUNDED_BELOW(d)) {
        if (!LADSPA_IS_HINT_BOUNDED_ABOVE(d)) {
            /* unbounded: might as well leave the value alone. */
        } else {
            /* bounded above only. just shift the range. */
            value = ub - 127.0f + value;
        }
    } else {
        if (!LADSPA_IS_HINT_BOUNDED_ABOVE(d)) {
            /* bounded below only. just shift the range. */
            value = lb + value;
        } else {
            /* bounded both ends.  more interesting. */
            /* XXX !!! todo: fill in logarithmic, sample rate &c */
            value = lb + ((ub - lb) * value / 127.0f);
        }
    }

    for (unsigned int i = 0; i < m_controlPortsIn.size(); ++i) {
        if (m_controlPortsIn[i].first == port) {
            setParameterValue(i, value);
        }
    }
}

float
DSSIPluginInstance::getControlOutputValue(size_t output) const
{
    if (output > m_controlPortsOut.size()) return 0.0;
    return (*m_controlPortsOut[output].second);
}

float
DSSIPluginInstance::getParameterValue(unsigned int parameter) const
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::getParameterValue(" << parameter << ")" << std::endl;
#endif
    if (parameter >= m_controlPortsIn.size()) return 0.0;
    return (*m_controlPortsIn[parameter].second);
}

float
DSSIPluginInstance::getParameterDefault(unsigned int parameter) const
{
    if (parameter >= m_controlPortsIn.size()) return 0.0;

    LADSPAPluginFactory *f = dynamic_cast<LADSPAPluginFactory *>(m_factory);
    if (f) {
        return f->getPortDefault(m_descriptor->LADSPA_Plugin,
                                 m_controlPortsIn[parameter].first);
    } else {
        return 0.0f;
    }
}

int
DSSIPluginInstance::getParameterDisplayHint(unsigned int parameter) const
{
    if (parameter >= m_controlPortsIn.size()) return 0.0;

    LADSPAPluginFactory *f = dynamic_cast<LADSPAPluginFactory *>(m_factory);
    if (f) {
        return f->getPortDisplayHint(m_descriptor->LADSPA_Plugin,
                                     m_controlPortsIn[parameter].first);
    } else {
        return PortHint::NoHint;
    }
}

std::string
DSSIPluginInstance::configure(std::string key,
                              std::string value)
{
    if (!m_descriptor || !m_descriptor->configure) return std::string();

    if (key == PluginIdentifier::RESERVED_PROJECT_DIRECTORY_KEY.toStdString()) {
#ifdef DSSI_PROJECT_DIRECTORY_KEY
        key = DSSI_PROJECT_DIRECTORY_KEY;
#else
        return std::string();
#endif
    }
        
    
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::configure(" << key << "," << value << ")" << std::endl;
#endif

    char *message = m_descriptor->configure(m_instanceHandle,
                                            key.c_str(),
                                            value.c_str());

    m_programCacheValid = false;

    m_configurationData[key] = value;

    std::string qm;

    // Ignore return values from reserved key configuration calls such
    // as project directory
#ifdef DSSI_RESERVED_CONFIGURE_PREFIX
    if (QString(key.c_str()).startsWith(DSSI_RESERVED_CONFIGURE_PREFIX)) {
        return qm;
    }
#endif

    if (message) {
        if (m_descriptor->LADSPA_Plugin && m_descriptor->LADSPA_Plugin->Label) {
            qm = std::string(m_descriptor->LADSPA_Plugin->Label) + ": ";
        }
        qm = qm + message;
        free(message);

        std::cerr << "DSSIPluginInstance::configure: warning: configure returned message: \"" << qm << "\"" << std::endl;
    }

    return qm;
}

void
DSSIPluginInstance::sendEvent(const Vamp::RealTime &eventTime,
                              const void *e)
{
#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::sendEvent: last was " << m_lastEventSendTime << " (valid " << m_haveLastEventSendTime << "), this is " << eventTime << std::endl;
#endif

    // The process mechanism only works correctly if the events are
    // sorted.  It's the responsibility of the caller to ensure that:
    // we will happily drop events here if we find the timeline going
    // backwards.
    if (m_haveLastEventSendTime &&
        m_lastEventSendTime > eventTime) {
#ifdef DEBUG_DSSI_PROCESS
        std::cerr << "... clearing down" << std::endl;
#endif
        m_haveLastEventSendTime = false;
        clearEvents();
    }

    snd_seq_event_t *event = (snd_seq_event_t *)e;
#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::sendEvent at " << eventTime << std::endl;
#endif
    snd_seq_event_t ev(*event);

    ev.time.time.tv_sec = eventTime.sec;
    ev.time.time.tv_nsec = eventTime.nsec;

    // DSSI doesn't use MIDI channels, it uses run_multiple_synths instead.
    ev.data.note.channel = 0;

    m_eventBuffer.write(&ev, 1);

    m_lastEventSendTime = eventTime;
    m_haveLastEventSendTime = true;
}

void
DSSIPluginInstance::clearEvents()
{
    m_haveLastEventSendTime = false;
    m_eventBuffer.reset();
}

bool
DSSIPluginInstance::handleController(snd_seq_event_t *ev)
{
    int controller = ev->data.control.param;

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::handleController " << controller << std::endl;
#endif

    if (controller == 0) { // bank select MSB
        
        m_pending.msb = ev->data.control.value;

    } else if (controller == 32) { // bank select LSB

        m_pending.lsb = ev->data.control.value;

    } else if (controller > 0 && controller < 128) {
        
        if (m_controllerMap.find(controller) != m_controllerMap.end()) {
            int port = m_controllerMap[controller];
            setPortValueFromController(port, ev->data.control.value);
        } else {
            return true; // pass through to plugin
        }
    }

    return false;
}

void
DSSIPluginInstance::run(const Vamp::RealTime &blockTime)
{
    static snd_seq_event_t localEventBuffer[EVENT_BUFFER_SIZE];
    int evCount = 0;

    bool needLock = false;
    if (m_descriptor->select_program) needLock = true;

    if (needLock) {
        if (!m_processLock.tryLock()) {
            for (size_t ch = 0; ch < m_audioPortsOut.size(); ++ch) {
                memset(m_outputBuffers[ch], 0, m_blockSize * sizeof(sample_t));
            }
            return;
        }
    }

    if (m_grouped) {
        runGrouped(blockTime);
        goto done;
    }

    if (!m_descriptor || !m_descriptor->run_synth) {
        m_eventBuffer.skip(m_eventBuffer.getReadSpace());
        m_haveLastEventSendTime = false;
        if (m_descriptor->LADSPA_Plugin->run) {
            m_descriptor->LADSPA_Plugin->run(m_instanceHandle, m_blockSize);
        } else {
            for (size_t ch = 0; ch < m_audioPortsOut.size(); ++ch) {
                memset(m_outputBuffers[ch], 0, m_blockSize * sizeof(sample_t));
            }
        }
        m_run = true;
        if (needLock) m_processLock.unlock();
        return;
    }

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::run(" << blockTime << ")" << std::endl;
#endif

#ifdef DEBUG_DSSI_PROCESS
    if (m_eventBuffer.getReadSpace() > 0) {
        std::cerr << "DSSIPluginInstance::run: event buffer has "
                  << m_eventBuffer.getReadSpace() << " event(s) in it" << std::endl;
    }
#endif

    while (m_eventBuffer.getReadSpace() > 0) {

        snd_seq_event_t *ev = localEventBuffer + evCount;
        *ev = m_eventBuffer.peekOne();
        bool accept = true;

        Vamp::RealTime evTime(ev->time.time.tv_sec, ev->time.time.tv_nsec);

        int frameOffset = 0;
        if (evTime > blockTime) {
            frameOffset = Vamp::RealTime::realTime2Frame(evTime - blockTime, m_sampleRate);
        }

#ifdef DEBUG_DSSI_PROCESS
        std::cerr << "DSSIPluginInstance::run: evTime " << evTime << ", blockTime " << blockTime << ", frameOffset " << frameOffset
                  << ", blockSize " << m_blockSize << std::endl;
        std::cerr << "Type: " << int(ev->type) << ", pitch: " << int(ev->data.note.note) << ", velocity: " << int(ev->data.note.velocity) << std::endl;
#endif

        if (frameOffset >= int(m_blockSize)) break;
        if (frameOffset < 0) {
            frameOffset = 0;
            if (ev->type == SND_SEQ_EVENT_NOTEON) {
                m_eventBuffer.skip(1);
                continue;
            }
        }

        ev->time.tick = frameOffset;
        m_eventBuffer.skip(1);

        if (ev->type == SND_SEQ_EVENT_CONTROLLER) {
            accept = handleController(ev);
        } else if (ev->type == SND_SEQ_EVENT_PGMCHANGE) {
            m_pending.program = ev->data.control.value;
            accept = false;
        }

        if (accept) {
            if (++evCount >= EVENT_BUFFER_SIZE) break;
        }
    }

    if (m_pending.program >= 0 && m_descriptor->select_program) {

        int program = m_pending.program;
        int bank = m_pending.lsb + 128 * m_pending.msb;

#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::run: making select_program(" << bank << "," << program << ") call" << std::endl;
#endif

        m_pending.lsb = m_pending.msb = m_pending.program = -1;
        m_descriptor->select_program(m_instanceHandle, bank, program);

#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::run: made select_program(" << bank << "," << program << ") call" << std::endl;
#endif
    }

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::run: running with " << evCount << " events"
              << std::endl;
#endif

    m_descriptor->run_synth(m_instanceHandle, m_blockSize,
                            localEventBuffer, evCount);

#ifdef DEBUG_DSSI_PROCESS
//    for (int i = 0; i < m_blockSize; ++i) {
//      std::cout << m_outputBuffers[0][i] << " ";
//      if (i % 8 == 0) std::cout << std::endl;
//    }
#endif

 done:
    if (needLock) m_processLock.unlock();

    if (m_audioPortsOut.size() == 0) {
        // copy inputs to outputs
        for (size_t ch = 0; ch < m_idealChannelCount; ++ch) {
            size_t sch = ch % m_audioPortsIn.size();
            for (size_t i = 0; i < m_blockSize; ++i) {
                m_outputBuffers[ch][i] = m_inputBuffers[sch][i];
            }
        }
    } else if (m_idealChannelCount < m_audioPortsOut.size()) {
        if (m_idealChannelCount == 1) {
            // mix down to mono
            for (size_t ch = 1; ch < m_audioPortsOut.size(); ++ch) {
                for (size_t i = 0; i < m_blockSize; ++i) {
                    m_outputBuffers[0][i] += m_outputBuffers[ch][i];
                }
            }
        }
    } else if (m_idealChannelCount > m_audioPortsOut.size()) {
        // duplicate
        for (size_t ch = m_audioPortsOut.size(); ch < m_idealChannelCount; ++ch) {
            size_t sch = (ch - m_audioPortsOut.size()) % m_audioPortsOut.size();
            for (size_t i = 0; i < m_blockSize; ++i) {
                m_outputBuffers[ch][i] = m_outputBuffers[sch][i];
            }
        }
    }   

    m_lastRunTime = blockTime;
    m_run = true;
}

void
DSSIPluginInstance::runGrouped(const Vamp::RealTime &blockTime)
{
    // If something else in our group has just been called for this
    // block time (but we haven't) then we should just write out the
    // results and return; if we have just been called for this block
    // time or nothing else in the group has been, we should run the
    // whole group.

    bool needRun = true;

    PluginSet &s = m_groupMap[m_identifier];

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::runGrouped(" << blockTime << "): this is " << this << "; " << s.size() << " elements in m_groupMap[" << m_identifier << "]" << std::endl;
#endif

    if (m_lastRunTime != blockTime) {
        for (PluginSet::iterator i = s.begin(); i != s.end(); ++i) {
            DSSIPluginInstance *instance = *i;
            if (instance != this && instance->m_lastRunTime == blockTime) {
#ifdef DEBUG_DSSI_PROCESS
                std::cerr << "DSSIPluginInstance::runGrouped(" << blockTime << "): plugin " << instance << " has already been run" << std::endl;
#endif
                needRun = false;
            }
        }
    }

    if (!needRun) {
#ifdef DEBUG_DSSI_PROCESS
        std::cerr << "DSSIPluginInstance::runGrouped(" << blockTime << "): already run, returning" << std::endl;
#endif
        return;
    }

#ifdef DEBUG_DSSI_PROCESS
    std::cerr << "DSSIPluginInstance::runGrouped(" << blockTime << "): I'm the first, running" << std::endl;
#endif

    size_t index = 0;
    unsigned long *counts = (unsigned long *)
        alloca(m_groupLocalEventBufferCount * sizeof(unsigned long));
    LADSPA_Handle *instances = (LADSPA_Handle *)
        alloca(m_groupLocalEventBufferCount * sizeof(LADSPA_Handle));

    for (PluginSet::iterator i = s.begin(); i != s.end(); ++i) {

        if (index >= m_groupLocalEventBufferCount) break;

        DSSIPluginInstance *instance = *i;
        counts[index] = 0;
        instances[index] = instance->m_instanceHandle;

#ifdef DEBUG_DSSI_PROCESS
        std::cerr << "DSSIPluginInstance::runGrouped(" << blockTime << "): running " << instance << std::endl;
#endif

        if (instance->m_pending.program >= 0 &&
            instance->m_descriptor->select_program) {
            int program = instance->m_pending.program;
            int bank = instance->m_pending.lsb + 128 * instance->m_pending.msb;
            instance->m_pending.lsb = instance->m_pending.msb = instance->m_pending.program = -1;
            instance->m_descriptor->select_program
                (instance->m_instanceHandle, bank, program);
        }

        while (instance->m_eventBuffer.getReadSpace() > 0) {

            snd_seq_event_t *ev = m_groupLocalEventBuffers[index] + counts[index];
            *ev = instance->m_eventBuffer.peekOne();
            bool accept = true;

            Vamp::RealTime evTime(ev->time.time.tv_sec, ev->time.time.tv_nsec);

            int frameOffset = 0;
            if (evTime > blockTime) {
                frameOffset = Vamp::RealTime::realTime2Frame(evTime - blockTime, m_sampleRate);
            }

#ifdef DEBUG_DSSI_PROCESS
            std::cerr << "DSSIPluginInstance::runGrouped: evTime " << evTime << ", frameOffset " << frameOffset
                      << ", block size " << m_blockSize << std::endl;
#endif

            if (frameOffset >= int(m_blockSize)) break;
            if (frameOffset < 0) frameOffset = 0;

            ev->time.tick = frameOffset;
            instance->m_eventBuffer.skip(1);

            if (ev->type == SND_SEQ_EVENT_CONTROLLER) {
                accept = instance->handleController(ev);
            } else if (ev->type == SND_SEQ_EVENT_PGMCHANGE) {
                instance->m_pending.program = ev->data.control.value;
                accept = false;
            }

            if (accept) {
                if (++counts[index] >= EVENT_BUFFER_SIZE) break;
            }
        }

        ++index;
    }

    m_descriptor->run_multiple_synths(index,
                                      instances,
                                      m_blockSize,
                                      m_groupLocalEventBuffers,
                                      counts);
}

int
DSSIPluginInstance::requestMidiSend(LADSPA_Handle /* instance */,
                                    unsigned char /* ports */,
                                    unsigned char /* channels */)
{
    // This is called from a non-RT context (during instantiate)

    std::cerr << "DSSIPluginInstance::requestMidiSend" << std::endl;
    return 1;
}

void
DSSIPluginInstance::midiSend(LADSPA_Handle /* instance */,
                             snd_seq_event_t * /* events */,
                             unsigned long /* eventCount */)
{
    // This is likely to be called from an RT context

    std::cerr << "DSSIPluginInstance::midiSend" << std::endl;
}

void
DSSIPluginInstance::NonRTPluginThread::run()
{
    while (!m_exiting) {
        m_runFunction(m_handle);
        usleep(100000);
    }
}

int
DSSIPluginInstance::requestNonRTThread(LADSPA_Handle instance,
                                       void (*runFunction)(LADSPA_Handle))
{
    NonRTPluginThread *thread = new NonRTPluginThread(instance, runFunction);
    m_threads[instance].insert(thread);
    thread->start();
    return 0;
}

void
DSSIPluginInstance::deactivate()
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::deactivate " << m_identifier << std::endl;
#endif
    if (!m_descriptor || !m_descriptor->LADSPA_Plugin->deactivate) return;

    for (size_t i = 0; i < m_backupControlPortsIn.size(); ++i) {
        m_backupControlPortsIn[i] = *m_controlPortsIn[i].second;
    }

    m_descriptor->LADSPA_Plugin->deactivate(m_instanceHandle);
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::deactivate " << m_identifier << " done" << std::endl;
#endif

    m_bufferScavenger.scavenge();
}

void
DSSIPluginInstance::cleanup()
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::cleanup " << m_identifier << std::endl;
#endif
    if (!m_descriptor) return;

    if (!m_descriptor->LADSPA_Plugin->cleanup) {
        std::cerr << "Bad plugin: plugin id "
                  << m_descriptor->LADSPA_Plugin->UniqueID
                  << ":" << m_descriptor->LADSPA_Plugin->Label
                  << " has no cleanup method!" << std::endl;
        return;
    }

    m_descriptor->LADSPA_Plugin->cleanup(m_instanceHandle);
    m_instanceHandle = 0;
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::cleanup " << m_identifier << " done" << std::endl;
#endif
}

---