379 lines
9.0 KiB
C++
379 lines
9.0 KiB
C++
/*
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Copyright (C) 2000-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <dlfcn.h>
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#include <pbd/compose.h>
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#include <pbd/error.h>
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#include <pbd/pathscanner.h>
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#include <control_protocol/control_protocol.h>
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#include <ardour/session.h>
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#include <ardour/control_protocol_manager.h>
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using namespace ARDOUR;
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using namespace std;
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using namespace PBD;
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#include "i18n.h"
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ControlProtocolManager* ControlProtocolManager::_instance = 0;
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const string ControlProtocolManager::state_node_name = X_("ControlProtocols");
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ControlProtocolManager::ControlProtocolManager ()
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{
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if (_instance == 0) {
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_instance = this;
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}
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_session = 0;
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}
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ControlProtocolManager::~ControlProtocolManager()
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{
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Glib::Mutex::Lock lm (protocols_lock);
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for (list<ControlProtocol*>::iterator i = control_protocols.begin(); i != control_protocols.end(); ++i) {
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delete (*i);
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}
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control_protocols.clear ();
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for (list<ControlProtocolInfo*>::iterator p = control_protocol_info.begin(); p != control_protocol_info.end(); ++p) {
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delete (*p);
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}
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control_protocol_info.clear();
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}
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void
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ControlProtocolManager::set_session (Session& s)
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{
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_session = &s;
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_session->GoingAway.connect (mem_fun (*this, &ControlProtocolManager::drop_session));
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for (list<ControlProtocolInfo*>::iterator i = control_protocol_info.begin(); i != control_protocol_info.end(); ++i) {
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if ((*i)->requested || (*i)->mandatory) {
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instantiate (**i);
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(*i)->requested = false;
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if ((*i)->protocol && (*i)->state) {
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(*i)->protocol->set_state (*(*i)->state);
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}
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}
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}
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}
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void
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ControlProtocolManager::drop_session ()
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{
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_session = 0;
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{
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Glib::Mutex::Lock lm (protocols_lock);
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for (list<ControlProtocol*>::iterator p = control_protocols.begin(); p != control_protocols.end(); ++p) {
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delete *p;
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}
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control_protocols.clear ();
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for (list<ControlProtocolInfo*>::iterator p = control_protocol_info.begin(); p != control_protocol_info.end(); ++p) {
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// otherwise the ControlProtocol instances are not recreated in set_session
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if ((*p)->protocol) {
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(*p)->requested = true;
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(*p)->protocol = 0;
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}
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}
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}
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}
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ControlProtocol*
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ControlProtocolManager::instantiate (ControlProtocolInfo& cpi)
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{
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if (_session == 0) {
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return 0;
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}
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cpi.descriptor = get_descriptor (cpi.path);
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if (cpi.descriptor == 0) {
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error << string_compose (_("control protocol name \"%1\" has no descriptor"), cpi.name) << endmsg;
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return 0;
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}
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if ((cpi.protocol = cpi.descriptor->initialize (cpi.descriptor, _session)) == 0) {
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error << string_compose (_("control protocol name \"%1\" could not be initialized"), cpi.name) << endmsg;
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return 0;
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}
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Glib::Mutex::Lock lm (protocols_lock);
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control_protocols.push_back (cpi.protocol);
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ProtocolStatusChange (&cpi); // EMIT SIGNAL
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return cpi.protocol;
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}
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int
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ControlProtocolManager::teardown (ControlProtocolInfo& cpi)
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{
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if (!cpi.protocol) {
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return 0;
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}
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if (!cpi.descriptor) {
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return 0;
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}
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if (cpi.mandatory) {
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return 0;
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}
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cpi.descriptor->destroy (cpi.descriptor, cpi.protocol);
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{
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Glib::Mutex::Lock lm (protocols_lock);
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list<ControlProtocol*>::iterator p = find (control_protocols.begin(), control_protocols.end(), cpi.protocol);
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if (p != control_protocols.end()) {
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control_protocols.erase (p);
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} else {
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cerr << "Programming error: ControlProtocolManager::teardown() called for " << cpi.name << ", but it was not found in control_protocols" << endl;
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}
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}
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cpi.protocol = 0;
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dlclose (cpi.descriptor->module);
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ProtocolStatusChange (&cpi); // EMIT SIGNAL
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return 0;
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}
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static bool protocol_filter (const string& str, void *arg)
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{
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/* Not a dotfile, has a prefix before a period, suffix is "so", or "dylib" */
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return str[0] != '.'
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&& ((str.length() > 3 && str.find (".so") == (str.length() - 3))
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|| (str.length() > 6 && str.find (".dylib") == (str.length() - 6)));
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}
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void
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ControlProtocolManager::load_mandatory_protocols ()
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{
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if (_session == 0) {
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return;
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}
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for (list<ControlProtocolInfo*>::iterator i = control_protocol_info.begin(); i != control_protocol_info.end(); ++i) {
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if ((*i)->mandatory && ((*i)->protocol == 0)) {
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info << string_compose (_("Instantiating mandatory control protocol %1"), (*i)->name) << endmsg;
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instantiate (**i);
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}
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}
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}
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void
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ControlProtocolManager::discover_control_protocols (string path)
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{
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vector<string *> *found;
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PathScanner scanner;
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info << string_compose (_("looking for control protocols in %1"), path) << endmsg;
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found = scanner (path, protocol_filter, 0, false, true);
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for (vector<string*>::iterator i = found->begin(); i != found->end(); ++i) {
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control_protocol_discover (**i);
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delete *i;
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}
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delete found;
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}
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int
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ControlProtocolManager::control_protocol_discover (string path)
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{
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ControlProtocolDescriptor* descriptor;
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if ((descriptor = get_descriptor (path)) != 0) {
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ControlProtocolInfo* cpi = new ControlProtocolInfo ();
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if (!descriptor->probe (descriptor)) {
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info << string_compose (_("Control protocol %1 not usable"), descriptor->name) << endmsg;
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} else {
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cpi->descriptor = descriptor;
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cpi->name = descriptor->name;
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cpi->path = path;
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cpi->protocol = 0;
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cpi->requested = false;
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cpi->mandatory = descriptor->mandatory;
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cpi->supports_feedback = descriptor->supports_feedback;
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cpi->state = 0;
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control_protocol_info.push_back (cpi);
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info << string_compose(_("Control surface protocol discovered: \"%1\""), cpi->name) << endmsg;
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}
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dlclose (descriptor->module);
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}
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return 0;
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}
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ControlProtocolDescriptor*
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ControlProtocolManager::get_descriptor (string path)
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{
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void *module;
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ControlProtocolDescriptor *descriptor = 0;
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ControlProtocolDescriptor* (*dfunc)(void);
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const char *errstr;
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if ((module = dlopen (path.c_str(), RTLD_NOW)) == 0) {
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error << string_compose(_("ControlProtocolManager: cannot load module \"%1\" (%2)"), path, dlerror()) << endmsg;
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return 0;
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}
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dfunc = (ControlProtocolDescriptor* (*)(void)) dlsym (module, "protocol_descriptor");
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if ((errstr = dlerror()) != 0) {
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error << string_compose(_("ControlProtocolManager: module \"%1\" has no descriptor function."), path) << endmsg;
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error << errstr << endmsg;
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dlclose (module);
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return 0;
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}
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descriptor = dfunc();
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if (descriptor) {
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descriptor->module = module;
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} else {
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dlclose (module);
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}
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return descriptor;
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}
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void
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ControlProtocolManager::foreach_known_protocol (sigc::slot<void,const ControlProtocolInfo*> method)
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{
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for (list<ControlProtocolInfo*>::iterator i = control_protocol_info.begin(); i != control_protocol_info.end(); ++i) {
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method (*i);
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}
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}
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ControlProtocolInfo*
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ControlProtocolManager::cpi_by_name (string name)
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{
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for (list<ControlProtocolInfo*>::iterator i = control_protocol_info.begin(); i != control_protocol_info.end(); ++i) {
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if (name == (*i)->name) {
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return *i;
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}
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}
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return 0;
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}
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int
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ControlProtocolManager::set_state (const XMLNode& node)
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{
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XMLNodeList clist;
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XMLNodeConstIterator citer;
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XMLProperty* prop;
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clist = node.children();
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for (citer = clist.begin(); citer != clist.end(); ++citer) {
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if ((*citer)->name() == X_("Protocol")) {
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if ((prop = (*citer)->property (X_("active"))) == 0) {
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continue;
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}
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bool active = string_is_affirmative (prop->value());
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if ((prop = (*citer)->property (X_("name"))) == 0) {
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continue;
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}
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ControlProtocolInfo* cpi = cpi_by_name (prop->value());
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if (cpi) {
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if (!(*citer)->children().empty()) {
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cpi->state = new XMLNode (*((*citer)->children().front ()));
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} else {
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cpi->state = 0;
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}
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if (active) {
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if (_session) {
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instantiate (*cpi);
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} else {
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cpi->requested = true;
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}
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} else {
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if (_session) {
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teardown (*cpi);
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} else {
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cpi->requested = false;
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}
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}
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}
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}
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}
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return 0;
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}
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XMLNode&
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ControlProtocolManager::get_state (void)
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{
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XMLNode* root = new XMLNode (state_node_name);
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Glib::Mutex::Lock lm (protocols_lock);
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for (list<ControlProtocolInfo*>::iterator i = control_protocol_info.begin(); i != control_protocol_info.end(); ++i) {
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XMLNode * child;
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if ((*i)->protocol) {
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child = &((*i)->protocol->get_state());
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child->add_property (X_("active"), "yes");
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// should we update (*i)->state here? probably.
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root->add_child_nocopy (*child);
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}
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else if ((*i)->state) {
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// keep ownership clear
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root->add_child_copy (*(*i)->state);
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}
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else {
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child = new XMLNode (X_("Protocol"));
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child->add_property (X_("name"), (*i)->name);
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child->add_property (X_("active"), "no");
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root->add_child_nocopy (*child);
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}
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}
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return *root;
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}
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