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Diffstat (limited to 'libs/backends/jack/jack_connection.cc')
| -rw-r--r-- | libs/backends/jack/jack_connection.cc | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/libs/backends/jack/jack_connection.cc b/libs/backends/jack/jack_connection.cc new file mode 100644 index 0000000000..07af4b8ade --- /dev/null +++ b/libs/backends/jack/jack_connection.cc @@ -0,0 +1,168 @@ +/* + Copyright (C) 2013 Paul Davis + + 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. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include <boost/scoped_ptr.hpp> +#include <jack/session.h> + +#include "pbd/epa.h" + +#include "jack_connection.h" +#include "jack_utils.h" + +#define GET_PRIVATE_JACK_POINTER(j) jack_client_t* _priv_jack = (jack_client_t*) (j); if (!_priv_jack) { return; } +#define GET_PRIVATE_JACK_POINTER_RET(j,r) jack_client_t* _priv_jack = (jack_client_t*) (j); if (!_priv_jack) { return r; } + +using namespace ARDOUR; +using namespace PBD; +using std::string; +using std::vector; +using std::cerr; +using std::endl; + +static void jack_halted_callback (void* arg) +{ + JackConnection* jc = static_cast<JackConnection*> (arg); + jc->halted_callback (); +} + +static void jack_halted_info_callback (jack_status_t code, const char* reason, void* arg) +{ + JackConnection* jc = static_cast<JackConnection*> (arg); + jc->halted_info_callback (code, reason); +} + + +JackConnection::JackConnection (const std::string& arg1, const std::string& arg2) + : _jack (0) + , _client_name (arg1) + , session_uuid (arg2) +{ +} + +JackConnection::~JackConnection () +{ + close (); +} + +bool +JackConnection::server_running () +{ + EnvironmentalProtectionAgency* global_epa = EnvironmentalProtectionAgency::get_global_epa (); + boost::scoped_ptr<EnvironmentalProtectionAgency> current_epa; + + /* revert all environment settings back to whatever they were when + * ardour started, because ardour's startup script may have reset + * something in ways that interfere with finding/starting JACK. + */ + + if (global_epa) { + current_epa.reset (new EnvironmentalProtectionAgency(true)); /* will restore settings when we leave scope */ + global_epa->restore (); + } + + jack_status_t status; + jack_client_t* c = jack_client_open ("ardourprobe", JackNoStartServer, &status); + + if (status == 0) { + jack_client_close (c); + return true; + } + + return false; +} + +int +JackConnection::open () +{ + EnvironmentalProtectionAgency* global_epa = EnvironmentalProtectionAgency::get_global_epa (); + boost::scoped_ptr<EnvironmentalProtectionAgency> current_epa; + jack_status_t status; + + close (); + + /* revert all environment settings back to whatever they were when ardour started + */ + + if (global_epa) { + current_epa.reset (new EnvironmentalProtectionAgency(true)); /* will restore settings when we leave scope */ + global_epa->restore (); + } + + /* ensure that PATH or equivalent includes likely locations of the JACK + * server, in case the user's default does not. + */ + + vector<string> dirs; + get_jack_server_dir_paths (dirs); + set_path_env_for_jack_autostart (dirs); + + if ((_jack = jack_client_open (_client_name.c_str(), JackSessionID, &status, session_uuid.c_str())) == 0) { + return -1; + } + + if (status & JackNameNotUnique) { + _client_name = jack_get_client_name (_jack); + } + + /* attach halted handler */ + + if (jack_on_info_shutdown) { + jack_on_info_shutdown (_jack, jack_halted_info_callback, this); + } else { + jack_on_shutdown (_jack, jack_halted_callback, this); + } + + + Connected(); /* EMIT SIGNAL */ + + return 0; +} + +int +JackConnection::close () +{ + GET_PRIVATE_JACK_POINTER_RET (_jack, -1); + + if (_priv_jack) { + int ret = jack_client_close (_priv_jack); + _jack = 0; + Disconnected (""); /* EMIT SIGNAL */ + return ret; + } + + return 0; +} + +void +JackConnection::halted_callback () +{ + _jack = 0; + cerr << "JACK HALTED\n"; + Disconnected (""); +} + +void +JackConnection::halted_info_callback (jack_status_t /*status*/, const char* reason) +{ + _jack = 0; + cerr << "JACK HALTED: " << reason << endl; + Disconnected (reason); +} + + |