annotate plugin/DSSIPluginInstance.cpp @ 38:a6b2128eed56

* Continue MainWindow refactoring by making MainWindow actually use the new
  Document class -- still somewhat unstable
* Fix crash in spectrogram layer
* Rename tonalestimator to TonalEstimator and add to project file

/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */

/*
    A waveform viewer and audio annotation editor.
    Chris Cannam, Queen Mary University of London, 2005-2006
    
    This is experimental software.  Not for distribution.
*/

/*
   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();
    }
}

DSSIPluginInstance::DSSIPluginInstance(RealTimePluginFactory *factory,
				       int clientId,
				       QString identifier,
				       int position,
				       unsigned long sampleRate,
				       size_t blockSize,
				       sample_t **inputBuffers,
				       sample_t **outputBuffers,
				       const DSSI_Descriptor* descriptor) :
    RealTimePluginInstance(factory, identifier),
    m_client(clientId),
    m_position(position),
    m_descriptor(descriptor),
    m_eventBuffer(EVENT_BUFFER_SIZE),
    m_blockSize(blockSize),
    m_inputBuffers(inputBuffers),
    m_outputBuffers(outputBuffers),
    m_ownBuffers(false),
    m_idealChannelCount(0),
    m_sampleRate(sampleRate),
    m_latencyPort(0),
    m_run(false),
    m_bypassed(false),
    m_grouped(false)
{
#ifdef DEBUG_DSSI
    std::cerr << "DSSIPluginInstance::DSSIPluginInstance[buffers supplied](" << identifier << ")"
	      << std::endl;
#endif

    init();

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

    instantiate(sampleRate);
    if (isOK()) {
	connectPorts();
	activate();
	if (m_descriptor->run_multiple_synths) {
	    m_grouped = true;
	    initialiseGroupMembership();
	}
    }
}


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) run(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;
    }

    //!!! GroupMap is not actually thread-safe.

    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()
{
    std::cerr << "DSSIPluginInstance::~DSSIPluginInstance" << std::endl;

    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 = QString("%1. %2").arg(index).arg(programDescriptor->Name);
	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;
}

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

    if (!m_descriptor) return QStringList();

    checkProgramCache();

    QStringList programs;

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

    return programs;
}

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

    if (!m_descriptor) return QString();

    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 QString();
}

unsigned long
DSSIPluginInstance::getProgram(QString 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;
}

QString
DSSIPluginInstance::getCurrentProgram() const
{
    return m_program;
}

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

void
DSSIPluginInstance::selectProgramAux(QString 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.isEmpty()) {
#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;
    std::cerr << "DSSIPluginInstance::connectPorts: " << m_audioPortsIn.size() 
	      << " audio ports in, " << m_audioPortsOut.size() << " out, "
	      << m_outputBufferCount << " output buffers" << std::endl;

    assert(sizeof(LADSPA_Data) == sizeof(float));
    assert(sizeof(sample_t) == sizeof(float));

    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);
    }

    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::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;
    }
}

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

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

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

    m_programCacheValid = false;

    QString qm;

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

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

    return qm;
}

void
DSSIPluginInstance::sendEvent(const 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 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;

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

	int frameOffset = 0;
	if (evTime > blockTime) {
	    frameOffset = 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 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;

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

	    int frameOffset = 0;
	    if (evTime > blockTime) {
		frameOffset = 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
}