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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
public class CameraTable {
private const int UPDATE_DELAY_MSEC = 1000;
// list of subsystems being monitored for events
private const string[] SUBSYSTEMS = { "usb", "block", null };
private static CameraTable instance = null;
#if HAVE_UDEV
private GUdev.Client client = new GUdev.Client(SUBSYSTEMS);
#endif
private OneShotScheduler camera_update_scheduler = null;
private GPhoto.Context null_context = new GPhoto.Context();
private GPhoto.CameraAbilitiesList abilities_list;
private VolumeMonitor volume_monitor;
private Gee.HashMap<string, DiscoveredCamera> camera_map = new Gee.HashMap<string, DiscoveredCamera>();
public signal void camera_added(DiscoveredCamera camera);
public signal void camera_removed(DiscoveredCamera camera);
private CameraTable() {
camera_update_scheduler = new OneShotScheduler("CameraTable update scheduler",
on_update_cameras);
// listen for interesting events on the specified subsystems
#if HAVE_UDEV
client.uevent.connect(on_udev_event);
#else
Timeout.add_seconds(10, () => { camera_update_scheduler.after_timeout(UPDATE_DELAY_MSEC, true); return true; });
#endif
volume_monitor = VolumeMonitor.get();
volume_monitor.volume_changed.connect(on_volume_changed);
volume_monitor.volume_added.connect(on_volume_changed);
// because loading the camera abilities list takes a bit of time and slows down app
// startup, delay loading it (and notifying any observers) for a small period of time,
// after the dust has settled
Timeout.add(500, delayed_init);
}
private bool delayed_init() {
// We disable this here so cameras that are already connected at the time
// the application is launched don't interfere with normal navigation...
((LibraryWindow) AppWindow.get_instance()).set_page_switching_enabled(false);
try {
init_camera_table();
} catch (GPhotoError err) {
warning("Unable to initialize camera table: %s", err.message);
return false;
}
try {
update_camera_table();
} catch (GPhotoError err) {
warning("Unable to update camera table: %s", err.message);
}
// ...and re-enable it here, so that cameras connected -after- the initial
// populating of the table will trigger a switch to the import page, as before.
((LibraryWindow) AppWindow.get_instance()).set_page_switching_enabled(true);
return false;
}
public static CameraTable get_instance() {
if (instance == null)
instance = new CameraTable();
return instance;
}
public Gee.Iterable<DiscoveredCamera> get_cameras() {
return camera_map.values;
}
public int get_count() {
return camera_map.size;
}
public DiscoveredCamera? get_for_uri(string uri) {
return camera_map.get(uri);
}
private void do_op(GPhoto.Result res, string op) throws GPhotoError {
if (res != GPhoto.Result.OK)
throw new GPhotoError.LIBRARY("[%d] Unable to %s: %s", (int) res, op, res.as_string());
}
private void init_camera_table() throws GPhotoError {
do_op(GPhoto.CameraAbilitiesList.create(out abilities_list), "create camera abilities list");
do_op(abilities_list.load(null_context), "load camera abilities list");
}
public static string get_port_uri(string port) {
return "gphoto2://[%s]/".printf(port);
}
private void update_camera_table() throws GPhotoError {
// need to do this because virtual ports come and go in the USB world (and probably others)
GPhoto.PortInfoList port_info_list;
do_op(GPhoto.PortInfoList.create(out port_info_list), "create port list");
do_op(port_info_list.load(), "load port list");
GPhoto.CameraList camera_list;
do_op(GPhoto.CameraList.create(out camera_list), "create camera list");
do_op(abilities_list.detect(port_info_list, camera_list, null_context), "detect cameras");
Gee.HashMap<string, string> detected_map = new Gee.HashMap<string, string>();
// go through the detected camera list and glean their ports
for (int ctr = 0; ctr < camera_list.count(); ctr++) {
string name;
do_op(camera_list.get_name(ctr, out name), "get detected camera name");
string port;
do_op(camera_list.get_value(ctr, out port), "get detected camera port");
debug("Detected %d/%d %s @ %s", ctr + 1, camera_list.count(), name, port);
detected_map.set(port, name);
}
// find cameras that have disappeared
DiscoveredCamera[] missing = new DiscoveredCamera[0];
foreach (DiscoveredCamera camera in camera_map.values) {
GPhoto.PortInfo port_info;
string tmp_path;
do_op(camera.gcamera.get_port_info(out port_info),
"retrieve missing camera port information");
port_info.get_path(out tmp_path);
GPhoto.CameraAbilities abilities;
do_op(camera.gcamera.get_abilities(out abilities), "retrieve camera abilities");
if (detected_map.has_key(tmp_path)) {
debug("Found camera for %s @ %s in detected map", abilities.model, tmp_path);
continue;
}
debug("%s @ %s missing", abilities.model, tmp_path);
missing += camera;
}
// have to remove from hash map outside of iterator
foreach (DiscoveredCamera camera in missing) {
GPhoto.PortInfo port_info;
string tmp_path;
do_op(camera.gcamera.get_port_info(out port_info),
"retrieve missing camera port information");
port_info.get_path(out tmp_path);
GPhoto.CameraAbilities abilities;
do_op(camera.gcamera.get_abilities(out abilities), "retrieve missing camera abilities");
debug("Removing from camera table: %s @ %s", abilities.model, tmp_path);
camera_map.unset(get_port_uri(tmp_path));
camera_removed(camera);
}
// add cameras which were not present before
foreach (string port in detected_map.keys) {
string name = detected_map.get(port);
string uri = get_port_uri(port);
if (camera_map.has_key(uri)) {
// already known about
debug("%s @ %s already registered, skipping", name, port);
continue;
}
int index = port_info_list.lookup_path(port);
if (index < 0)
do_op((GPhoto.Result) index, "lookup port %s".printf(port));
GPhoto.PortInfo port_info;
string tmp_path;
do_op(port_info_list.get_info(index, out port_info), "get port info for %s".printf(port));
port_info.get_path(out tmp_path);
// this should match, every time
assert(port == tmp_path);
index = abilities_list.lookup_model(name);
if (index < 0)
do_op((GPhoto.Result) index, "lookup camera model %s".printf(name));
GPhoto.CameraAbilities camera_abilities;
do_op(abilities_list.get_abilities(index, out camera_abilities),
"lookup camera abilities for %s".printf(name));
debug("Adding to camera table: %s @ %s", name, port);
var camera = new DiscoveredCamera(name, port, port_info, camera_abilities);
camera_map.set(uri, camera);
camera_added(camera);
}
}
#if HAVE_UDEV
private void on_udev_event(string action, GUdev.Device device) {
debug("udev event: %s on %s", action, device.get_name());
// Device add/removes often arrive in pairs; this allows for a single
// update to occur when they come in all at once
camera_update_scheduler.after_timeout(UPDATE_DELAY_MSEC, true);
}
#endif
public void on_volume_changed(Volume volume) {
camera_update_scheduler.after_timeout(UPDATE_DELAY_MSEC, true);
}
private void on_update_cameras() {
try {
get_instance().update_camera_table();
} catch (GPhotoError err) {
warning("Error updating camera table: %s", err.message);
}
}
}
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