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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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devicemonitor: Only fail start() if no provider at all could be started
Also refactor various internals of the monitor code:
- Don't allow starting twice but just return directly when starting a
second time.
- Don't end up in an inconsistent state if call start() a second time
while the monitor is starting up.
- Remove complicated cookie code: it was not possible to add/remove
filters while the monitor was started anyway so this was only useful
in the very small time-window while starting the monitor or while
getting the devices. Instead disallow adding/removing filters while
the monitor is starting, and when getting devices work on a snapshot
of providers/filters.
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/667
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1189>
This commit is contained in:
Sebastian Dröge
GStreamer Marge Bot
parent
139bfc8aeb
commit
1912bcbcc4
1 changed files with 100 additions and 114 deletions
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@ -108,10 +108,10 @@ struct _GstDeviceMonitorPrivate
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GstBus *bus;
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GPtrArray *providers;
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guint cookie;
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GPtrArray *filters;
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GList *started_providers;
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guint last_id;
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GList *hidden;
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gboolean show_all;
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@ -129,6 +129,9 @@ G_DEFINE_TYPE_WITH_PRIVATE (GstDeviceMonitor, gst_device_monitor,
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static void gst_device_monitor_dispose (GObject * object);
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static guint gst_device_monitor_add_filter_unlocked (GstDeviceMonitor * monitor,
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const gchar * classes, GstCaps * caps);
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struct DeviceFilter
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{
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guint id;
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@ -137,10 +140,23 @@ struct DeviceFilter
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GstCaps *caps;
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};
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static struct DeviceFilter *
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device_filter_copy (struct DeviceFilter *filter)
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{
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struct DeviceFilter *copy = g_slice_new0 (struct DeviceFilter);
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copy->classesv = g_strdupv (filter->classesv);
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copy->caps = filter->caps ? gst_caps_ref (filter->caps) : NULL;
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return copy;
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}
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static void
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device_filter_free (struct DeviceFilter *filter)
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{
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g_strfreev (filter->classesv);
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if (filter->caps)
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gst_caps_unref (filter->caps);
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g_slice_free (struct DeviceFilter, filter);
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@ -357,9 +373,11 @@ gst_device_monitor_dispose (GObject * object)
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GList *
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gst_device_monitor_get_devices (GstDeviceMonitor * monitor)
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{
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GList *devices = NULL, *hidden = NULL;
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GQueue providers = G_QUEUE_INIT, filters = G_QUEUE_INIT;
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GList *hidden = NULL;
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GQueue devices = G_QUEUE_INIT;
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GList *l;
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guint i;
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guint cookie;
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g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), NULL);
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@ -377,13 +395,6 @@ gst_device_monitor_get_devices (GstDeviceMonitor * monitor)
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return NULL;
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}
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again:
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g_list_free_full (devices, gst_object_unref);
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g_list_free_full (hidden, g_free);
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devices = NULL;
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hidden = NULL;
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for (i = 0; i < monitor->priv->providers->len; i++) {
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GstDeviceProvider *provider =
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g_ptr_array_index (monitor->priv->providers, i);
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@ -391,37 +402,41 @@ again:
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update_hidden_providers_list (&hidden, provider);
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}
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cookie = monitor->priv->cookie;
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/* Create a copy of all current providers and filters while keeping the lock
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* and afterwards unlock and work with this snapshot */
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for (i = 0; i < monitor->priv->providers->len; i++) {
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GList *tmpdev;
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GstDeviceProvider *provider =
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gst_object_ref (g_ptr_array_index (monitor->priv->providers, i));
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GList *item;
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g_ptr_array_index (monitor->priv->providers, i);
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if (!is_provider_hidden (monitor, hidden, provider)) {
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GST_OBJECT_UNLOCK (monitor);
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tmpdev = gst_device_provider_get_devices (provider);
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GST_OBJECT_LOCK (monitor);
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} else {
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tmpdev = NULL;
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g_queue_push_tail (&providers, gst_object_ref (provider));
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}
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}
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for (i = 0; i < monitor->priv->filters->len; i++) {
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struct DeviceFilter *filter = g_ptr_array_index (monitor->priv->filters, i);
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g_queue_push_tail (&filters, device_filter_copy (filter));
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}
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GST_OBJECT_UNLOCK (monitor);
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for (l = providers.head; l; l = l->next) {
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GstDeviceProvider *provider = l->data;
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GList *tmpdev, *item, *filter_item;
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tmpdev = gst_device_provider_get_devices (provider);
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for (item = tmpdev; item; item = item->next) {
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GstDevice *dev = GST_DEVICE (item->data);
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GstCaps *caps = gst_device_get_caps (dev);
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guint j;
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for (j = 0; j < monitor->priv->filters->len; j++) {
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struct DeviceFilter *filter =
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g_ptr_array_index (monitor->priv->filters, j);
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for (filter_item = filters.head; filter_item;
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filter_item = filter_item->next) {
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struct DeviceFilter *filter = filter_item->data;
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if (gst_caps_can_intersect (filter->caps, caps) &&
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gst_device_has_classesv (dev, filter->classesv)) {
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devices = g_list_prepend (devices, gst_object_ref (dev));
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g_queue_push_tail (&devices, gst_object_ref (dev));
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break;
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}
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}
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@ -429,16 +444,13 @@ again:
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}
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g_list_free_full (tmpdev, gst_object_unref);
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gst_object_unref (provider);
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if (monitor->priv->cookie != cookie)
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goto again;
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}
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g_list_free_full (hidden, g_free);
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GST_OBJECT_UNLOCK (monitor);
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g_queue_clear_full (&providers, (GDestroyNotify) gst_object_unref);
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g_queue_clear_full (&filters, (GDestroyNotify) device_filter_free);
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return g_list_reverse (devices);
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return devices.head;
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}
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/**
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@ -449,7 +461,8 @@ again:
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* %GST_MESSAGE_DEVICE_ADDED and %GST_MESSAGE_DEVICE_REMOVED messages
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* will be emitted on the bus when the list of devices changes.
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*
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* Returns: %TRUE if the device monitoring could be started
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* Returns: %TRUE if the device monitoring could be started, i.e. at least a
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* single device provider was started successfully.
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*
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* Since: 1.4
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*/
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@ -457,19 +470,24 @@ again:
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gboolean
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gst_device_monitor_start (GstDeviceMonitor * monitor)
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{
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guint cookie, i;
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GList *pending = NULL, *started = NULL, *removed = NULL;
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guint i;
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GQueue pending = G_QUEUE_INIT;
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GList *started = NULL;
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GstDeviceProvider *provider;
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g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), FALSE);
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GST_OBJECT_LOCK (monitor);
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if (monitor->priv->filters->len == 0) {
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if (monitor->priv->started) {
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GST_OBJECT_UNLOCK (monitor);
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GST_DEBUG_OBJECT (monitor, "Monitor started already");
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return TRUE;
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}
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if (monitor->priv->filters->len == 0) {
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GST_WARNING_OBJECT (monitor, "No filters have been set, will expose all "
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"devices found");
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gst_device_monitor_add_filter (monitor, NULL, NULL);
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GST_OBJECT_LOCK (monitor);
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gst_device_monitor_add_filter_unlocked (monitor, NULL, NULL);
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}
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if (monitor->priv->providers->len == 0) {
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@ -478,74 +496,39 @@ gst_device_monitor_start (GstDeviceMonitor * monitor)
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return FALSE;
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}
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monitor->priv->started = TRUE;
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gst_bus_set_flushing (monitor->priv->bus, FALSE);
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again:
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cookie = monitor->priv->cookie;
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g_list_free_full (pending, gst_object_unref);
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pending = NULL;
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removed = started;
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started = NULL;
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for (i = 0; i < monitor->priv->providers->len; i++) {
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GstDeviceProvider *provider;
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GList *find;
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provider = g_ptr_array_index (monitor->priv->providers, i);
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find = g_list_find (removed, provider);
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if (find) {
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/* this was already started, move to started list */
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removed = g_list_remove_link (removed, find);
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started = g_list_concat (started, find);
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} else {
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/* not started, add to pending list */
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pending = g_list_append (pending, gst_object_ref (provider));
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g_queue_push_tail (&pending, gst_object_ref (provider));
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}
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}
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g_list_free_full (removed, gst_object_unref);
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removed = NULL;
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while (pending) {
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GstDeviceProvider *provider = pending->data;
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while ((provider = g_queue_pop_head (&pending))) {
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GST_OBJECT_UNLOCK (monitor);
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if (!gst_device_provider_start (provider))
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goto start_failed;
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GST_OBJECT_LOCK (monitor);
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if (gst_device_provider_start (provider)) {
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started = g_list_prepend (started, provider);
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pending = g_list_delete_link (pending, pending);
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if (monitor->priv->cookie != cookie)
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goto again;
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}
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monitor->priv->started = TRUE;
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GST_OBJECT_UNLOCK (monitor);
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g_list_free_full (started, gst_object_unref);
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return TRUE;
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start_failed:
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{
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GST_OBJECT_LOCK (monitor);
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gst_bus_set_flushing (monitor->priv->bus, TRUE);
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GST_OBJECT_UNLOCK (monitor);
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while (started) {
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GstDeviceProvider *provider = started->data;
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gst_device_provider_stop (provider);
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} else {
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gst_object_unref (provider);
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}
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started = g_list_delete_link (started, started);
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GST_OBJECT_LOCK (monitor);
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}
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return FALSE;
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if (started) {
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monitor->priv->started_providers = started;
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} else {
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gst_bus_set_flushing (monitor->priv->bus, TRUE);
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monitor->priv->started = FALSE;
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}
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GST_OBJECT_UNLOCK (monitor);
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return started != NULL;
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}
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/**
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@ -559,7 +542,6 @@ start_failed:
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void
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gst_device_monitor_stop (GstDeviceMonitor * monitor)
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{
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guint i;
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GList *started = NULL;
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g_return_if_fail (GST_IS_DEVICE_MONITOR (monitor));
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@ -567,13 +549,15 @@ gst_device_monitor_stop (GstDeviceMonitor * monitor)
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gst_bus_set_flushing (monitor->priv->bus, TRUE);
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GST_OBJECT_LOCK (monitor);
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for (i = 0; i < monitor->priv->providers->len; i++) {
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GstDeviceProvider *provider =
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g_ptr_array_index (monitor->priv->providers, i);
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if (gst_device_provider_is_started (provider))
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started = g_list_prepend (started, gst_object_ref (provider));
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if (!monitor->priv->started) {
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GST_DEBUG_OBJECT (monitor, "Monitor was not started yet");
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GST_OBJECT_UNLOCK (monitor);
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return;
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}
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started = monitor->priv->started_providers;
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monitor->priv->started_providers = NULL;
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monitor->priv->started = FALSE;
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GST_OBJECT_UNLOCK (monitor);
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while (started) {
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@ -584,11 +568,6 @@ gst_device_monitor_stop (GstDeviceMonitor * monitor)
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started = g_list_delete_link (started, started);
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gst_object_unref (provider);
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}
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GST_OBJECT_LOCK (monitor);
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monitor->priv->started = FALSE;
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GST_OBJECT_UNLOCK (monitor);
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}
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static void
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@ -645,15 +624,26 @@ guint
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gst_device_monitor_add_filter (GstDeviceMonitor * monitor,
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const gchar * classes, GstCaps * caps)
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{
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GList *factories = NULL;
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struct DeviceFilter *filter;
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guint id = 0;
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gboolean matched = FALSE;
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guint id;
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g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), 0);
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g_return_val_if_fail (!monitor->priv->started, 0);
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GST_OBJECT_LOCK (monitor);
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id = gst_device_monitor_add_filter_unlocked (monitor, classes, caps);
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GST_OBJECT_UNLOCK (monitor);
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return id;
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}
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static guint
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gst_device_monitor_add_filter_unlocked (GstDeviceMonitor * monitor,
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const gchar * classes, GstCaps * caps)
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{
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GList *factories = NULL;
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struct DeviceFilter *filter;
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guint id = 0;
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gboolean matched = FALSE;
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filter = g_slice_new0 (struct DeviceFilter);
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filter->id = monitor->priv->last_id++;
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@ -702,7 +692,6 @@ gst_device_monitor_add_filter (GstDeviceMonitor * monitor,
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G_CALLBACK (bus_sync_message), monitor);
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gst_object_unref (bus);
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g_ptr_array_add (monitor->priv->providers, provider);
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monitor->priv->cookie++;
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}
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}
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@ -717,8 +706,6 @@ gst_device_monitor_add_filter (GstDeviceMonitor * monitor,
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id = filter->id;
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g_ptr_array_add (monitor->priv->filters, filter);
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GST_OBJECT_UNLOCK (monitor);
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return id;
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}
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@ -775,7 +762,6 @@ gst_device_monitor_remove_filter (GstDeviceMonitor * monitor, guint filter_id)
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}
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if (!valid) {
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monitor->priv->cookie++;
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gst_device_monitor_remove (monitor, i);
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i--;
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}
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