annotate osc/OSCQueue.cpp @ 182:21a76c9ed5c3

* Merge transform directory from sv-match-alignment branch
  (the previous comment included notes for this stuff, but I missed it
  in the actual merge)
* Fix crash when a transform fails to create an output model and the
  thread that created the transform then deletes its input model thinking
  it's no longer needed, even though the transform run thread is still
  using it -- fix is to wait() on the transform before returning the
  null output model

/* -*- 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 and QMUL.
*/

#include "OSCQueue.h"

#include <iostream>

#define OSC_MESSAGE_QUEUE_SIZE 1023

#ifdef HAVE_LIBLO

void
OSCQueue::oscError(int num, const char *msg, const char *path)
{
    std::cerr << "ERROR: OSCQueue::oscError: liblo server error " << num
	      << " in path " << path << ": " << msg << std::endl;
}

int
OSCQueue::oscMessageHandler(const char *path, const char *types, lo_arg **argv,
                            int argc, lo_message, void *user_data)
{
    OSCQueue *queue = static_cast<OSCQueue *>(user_data);

    int target;
    int targetData;
    QString method;

    if (!queue->parseOSCPath(path, target, targetData, method)) {
	return 1;
    }

    OSCMessage message;
    message.setTarget(target);
    message.setTargetData(targetData);
    message.setMethod(method);

    int i = 0;

    while (types && i < argc && types[i]) {

        char type = types[i];
        lo_arg *arg = argv[i];

        switch (type) {
        case 'i': message.addArg(arg->i); break;
            // This conversion fails to compile in 64-bit environments
            // at present, and we don't use the h type anyway so we
            // can safely omit it
//        case 'h': message.addArg(arg->h); break;
        case 'f': message.addArg(arg->f); break;
        case 'd': message.addArg(arg->d); break;
        case 'c': message.addArg(arg->c); break;
        case 't': message.addArg(arg->i); break;
        case 's': message.addArg(&arg->s); break;
        default:  std::cerr << "WARNING: OSCQueue::oscMessageHandler: "
                            << "Unsupported OSC type '" << type << "'" 
                            << std::endl;
            break;
        }

	++i;
    }

    queue->postMessage(message);
    return 0;
}

#endif
   
OSCQueue::OSCQueue() :
#ifdef HAVE_LIBLO
    m_thread(0),
#endif
    m_buffer(OSC_MESSAGE_QUEUE_SIZE)
{
#ifdef HAVE_LIBLO
    m_thread = lo_server_thread_new(NULL, oscError);

    lo_server_thread_add_method(m_thread, NULL, NULL,
                                oscMessageHandler, this);

    lo_server_thread_start(m_thread);

    std::cout << "OSCQueue::OSCQueue: Base OSC URL is "
              << lo_server_thread_get_url(m_thread) << std::endl;
#endif
}

OSCQueue::~OSCQueue()
{
#ifdef HAVE_LIBLO
    if (m_thread) {
        lo_server_thread_stop(m_thread);
    }
#endif

    while (m_buffer.getReadSpace() > 0) {
        delete m_buffer.readOne();
    }
}

bool
OSCQueue::isOK() const
{
#ifdef HAVE_LIBLO
    return (m_thread != 0);
#else
    return false;
#endif
}

QString
OSCQueue::getOSCURL() const
{
    QString url = "";
#ifdef HAVE_LIBLO
    url = lo_server_thread_get_url(m_thread);
#endif
    return url;
}

size_t
OSCQueue::getMessagesAvailable() const
{
    return m_buffer.getReadSpace();
}

OSCMessage
OSCQueue::readMessage()
{
    OSCMessage *message = m_buffer.readOne();
    OSCMessage rmessage = *message;
    delete message;
    return rmessage;
}

void
OSCQueue::postMessage(OSCMessage message)
{
    int count = 0, max = 5;
    while (m_buffer.getWriteSpace() == 0) {
        if (count == max) {
            std::cerr << "ERROR: OSCQueue::postMessage: OSC message queue is full and not clearing -- abandoning incoming message" << std::endl;
            return;
        }
        std::cerr << "WARNING: OSCQueue::postMessage: OSC message queue (capacity " << m_buffer.getSize() << " is full!" << std::endl;
        std::cerr << "Waiting for something to be processed" << std::endl;
#ifdef _WIN32
        Sleep(1);
#else
        sleep(1);
#endif
        count++;
    }

    OSCMessage *mp = new OSCMessage(message);
    m_buffer.write(&mp, 1);
    std::cerr << "OSCQueue::postMessage: Posted OSC message: target "
              << message.getTarget() << ", target data " << message.getTargetData()
              << ", method " << message.getMethod().toStdString() << std::endl;
    emit messagesAvailable();
}

bool
OSCQueue::parseOSCPath(QString path, int &target, int &targetData,
                       QString &method)
{
    while (path.startsWith("/")) {
	path = path.right(path.length()-1);
    }

    int i = 0;

    bool ok = false;
    target = path.section('/', i, i).toInt(&ok);

    if (!ok) {
        target = 0;
    } else {
        ++i;
        targetData = path.section('/', i, i).toInt(&ok);
        if (!ok) {
            targetData = 0;
        } else {
            ++i;
        }
    }

    method = path.section('/', i, -1);

    if (method.contains('/')) {
        std::cerr << "ERROR: OSCQueue::parseOSCPath: malformed path \""
                  << path.toStdString() << "\" (should be target/data/method or "
                  << "target/method or method, where target and data "
                  << "are numeric)" << std::endl;
        return false;
    }

    std::cerr << "OSCQueue::parseOSCPath: good path \"" << path.toStdString()
              << "\"" << std::endl;

    return true;
}