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devicemonitor: Make it possible to add multiple filters

Browse source 
Each filter will include a GstCaps and a set of classes to match
This commit is contained in:
Olivier Crête 2014-06-26 17:13:12 -04:00
parent d76e0be9fd
commit 6d12b33945
7 changed files with 244 additions and 214 deletions
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10
docs/gst/gstreamer-sections.txt
View file

@ -3415,15 +3415,13 @@ gst_device_provider_factory_get_type
<TITLE>GstDeviceMonitor</TITLE>
GstDeviceMonitor
GstDeviceMonitorClass
gst_device_monitor_get_bus
gst_device_monitor_get_caps_filter
gst_device_monitor_get_classes_filter
gst_device_monitor_get_devices
gst_device_monitor_new
gst_device_monitor_set_caps_filter
gst_device_monitor_set_classes_filter
gst_device_monitor_get_bus
gst_device_monitor_add_filter
gst_device_monitor_remove_filter
gst_device_monitor_start
gst_device_monitor_stop
gst_device_monitor_get_devices
<SUBSECTION Standard>
GstDeviceMonitorPrivate

379
gst/gstdevicemonitor.c
View file

@ -31,6 +31,9 @@
* messages on its #GstBus for devices that have been added and
* removed.
*
* The device monitor will monitor all devices matching the filters that
* the application has set.
*
* Since: 1.4
*/
@ -51,8 +54,9 @@ struct _GstDeviceMonitorPrivate
GPtrArray *providers;
guint cookie;
GstCaps *caps;
gchar *classes;
GPtrArray *filters;
guint last_id;
};
@ -60,6 +64,23 @@ G_DEFINE_TYPE (GstDeviceMonitor, gst_device_monitor, GST_TYPE_OBJECT);
static void gst_device_monitor_dispose (GObject * object);
struct DeviceFilter
{
guint id;
gchar **classesv;
GstCaps *caps;
};
static void
device_filter_free (struct DeviceFilter *filter)
{
g_strfreev (filter->classesv);
gst_caps_unref (filter->caps);
g_slice_free (struct DeviceFilter, filter);
}
static void
gst_device_monitor_class_init (GstDeviceMonitorClass * klass)
{
@ -78,7 +99,6 @@ bus_sync_message (GstBus * bus, GstMessage * message,
if (type == GST_MESSAGE_DEVICE_ADDED || type == GST_MESSAGE_DEVICE_REMOVED) {
gboolean matches;
GstCaps *caps;
GstDevice *device;
if (type == GST_MESSAGE_DEVICE_ADDED)
@ -87,12 +107,28 @@ bus_sync_message (GstBus * bus, GstMessage * message,
gst_message_parse_device_removed (message, &device);
GST_OBJECT_LOCK (monitor);
caps = gst_device_get_caps (device);
matches = gst_caps_can_intersect (monitor->priv->caps, caps) &&
gst_device_has_classes (device, monitor->priv->classes);
gst_caps_unref (caps);
if (monitor->priv->filters->len) {
guint i;
for (i = 0; i < monitor->priv->filters->len; i++) {
struct DeviceFilter *filter =
g_ptr_array_index (monitor->priv->filters, i);
GstCaps *caps;
caps = gst_device_get_caps (device);
matches = gst_caps_can_intersect (filter->caps, caps) &&
gst_device_has_classesv (device, filter->classesv);
gst_caps_unref (caps);
if (matches)
break;
}
} else {
matches = TRUE;
}
GST_OBJECT_UNLOCK (monitor);
gst_object_unref (device);
if (matches)
gst_bus_post (monitor->priv->bus, gst_message_ref (message));
}
@ -102,8 +138,6 @@ bus_sync_message (GstBus * bus, GstMessage * message,
static void
gst_device_monitor_init (GstDeviceMonitor * self)
{
GList *factories;
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GST_TYPE_DEVICE_MONITOR, GstDeviceMonitorPrivate);
@ -111,31 +145,10 @@ gst_device_monitor_init (GstDeviceMonitor * self)
gst_bus_set_flushing (self->priv->bus, TRUE);
self->priv->providers = g_ptr_array_new ();
self->priv->caps = gst_caps_new_any ();
self->priv->classes = g_strdup ("");
self->priv->filters = g_ptr_array_new_with_free_func (
(GDestroyNotify) device_filter_free);
factories =
gst_device_provider_factory_list_get_device_providers (self->
priv->classes, 1);
while (factories) {
GstDeviceProviderFactory *factory = factories->data;
GstDeviceProvider *provider;
factories = g_list_remove (factories, factory);
provider = gst_device_provider_factory_get (factory);
if (provider) {
GstBus *bus = gst_device_provider_get_bus (provider);
gst_bus_enable_sync_message_emission (bus);
g_signal_connect (bus, "sync-message",
G_CALLBACK (bus_sync_message), self);
g_ptr_array_add (self->priv->providers, provider);
}
gst_object_unref (factory);
}
self->priv->last_id = 1;
}
@ -168,8 +181,8 @@ gst_device_monitor_dispose (GObject * object)
self->priv->providers = NULL;
}
gst_caps_replace (&self->priv->caps, NULL);
g_free (self->priv->classes);
g_clear_pointer (&self->priv->filters, (GDestroyNotify) g_ptr_array_unref);
gst_object_replace ((GstObject **) & self->priv->bus, NULL);
G_OBJECT_CLASS (gst_device_monitor_parent_class)->dispose (object);
@ -199,6 +212,18 @@ gst_device_monitor_get_devices (GstDeviceMonitor * monitor)
GST_OBJECT_LOCK (monitor);
if (monitor->priv->filters->len == 0) {
GST_OBJECT_UNLOCK (monitor);
GST_WARNING_OBJECT (monitor, "No filters have been set");
return FALSE;
}
if (monitor->priv->providers->len == 0) {
GST_OBJECT_UNLOCK (monitor);
GST_WARNING_OBJECT (monitor, "No providers match the current filters");
return FALSE;
}
again:
g_list_free_full (devices, gst_object_unref);
@ -216,20 +241,28 @@ again:
tmpdev = gst_device_provider_get_devices (provider);
GST_OBJECT_LOCK (monitor);
for (item = tmpdev; item; item = item->next) {
GstDevice *dev = GST_DEVICE (item->data);
GstCaps *caps = gst_device_get_caps (dev);
guint j;
if (gst_caps_can_intersect (monitor->priv->caps, caps) &&
gst_device_has_classes (dev, monitor->priv->classes))
devices = g_list_prepend (devices, gst_object_ref (dev));
for (j = 0; j < monitor->priv->filters->len; j++) {
struct DeviceFilter *filter =
g_ptr_array_index (monitor->priv->filters, j);
if (gst_caps_can_intersect (filter->caps, caps) &&
gst_device_has_classesv (dev, filter->classesv)) {
devices = g_list_prepend (devices, gst_object_ref (dev));
break;
}
}
gst_caps_unref (caps);
}
g_list_free_full (tmpdev, gst_object_unref);
gst_object_unref (provider);
GST_OBJECT_LOCK (monitor);
if (monitor->priv->cookie != cookie)
goto again;
@ -262,24 +295,35 @@ gst_device_monitor_start (GstDeviceMonitor * monitor)
GST_OBJECT_LOCK (monitor);
if (monitor->priv->filters->len == 0) {
GST_OBJECT_UNLOCK (monitor);
GST_WARNING_OBJECT (monitor, "No filters have been set");
return FALSE;
}
if (monitor->priv->providers->len == 0) {
GST_OBJECT_UNLOCK (monitor);
GST_WARNING_OBJECT (monitor, "No providers match the current filters");
return FALSE;
}
gst_bus_set_flushing (monitor->priv->bus, FALSE);
for (i = 0; i < monitor->priv->providers->len; i++) {
if (!gst_device_provider_start (g_ptr_array_index (monitor->priv->providers,
i))) {
gst_bus_set_flushing (monitor->priv->bus, TRUE);
GstDeviceProvider *provider =
g_ptr_array_index (monitor->priv->providers, i);
for (; i != 0; i--)
gst_device_provider_stop (g_ptr_array_index (monitor->priv->providers,
i - 1));
if (gst_device_provider_can_monitor (provider)) {
if (!gst_device_provider_start (provider)) {
gst_bus_set_flushing (monitor->priv->bus, TRUE);
GST_OBJECT_UNLOCK (monitor);
return FALSE;
for (; i != 0; i--)
gst_device_provider_stop (g_ptr_array_index (monitor->priv->providers,
i - 1));
GST_OBJECT_UNLOCK (monitor);
return FALSE;
}
}
}
@ -307,165 +351,180 @@ gst_device_monitor_stop (GstDeviceMonitor * monitor)
gst_bus_set_flushing (monitor->priv->bus, TRUE);
GST_OBJECT_LOCK (monitor);
for (i = 0; i < monitor->priv->providers->len; i++)
gst_device_provider_stop (g_ptr_array_index (monitor->priv->providers, i));
for (i = 0; i < monitor->priv->providers->len; i++) {
GstDeviceProvider *provider =
g_ptr_array_index (monitor->priv->providers, i);
if (gst_device_provider_can_monitor (provider))
gst_device_provider_stop (provider);
}
monitor->priv->started = FALSE;
GST_OBJECT_UNLOCK (monitor);
}
/**
* gst_device_monitor_set_classes_filter:
* @monitor: the device monitor
* @classes: device classes to use as filter
* gst_device_monitor_add_filter:
* @monitor: a device monitor
* @classes: device classes to use as filter or %NULL for any class
* @caps: (allow-none): the #GstCaps to filter or %NULL for ANY
*
* Filter devices monitored by device class, e.g. in case you are only
* interested in a certain type of device like audio devices or
* video sources.
* Adds a filter for which #GstDevice will be monitored, any device that matches
* all classes and the #GstCaps will be returned.
*
* Filters must be added before the #GstDeviceMonitor is started.
*
* Returns: The id of the new filter or %0 if no provider matched the filter's
* classes.
*
* Since: 1.4
*/
void
gst_device_monitor_set_classes_filter (GstDeviceMonitor * monitor,
const gchar * classes)
guint
gst_device_monitor_add_filter (GstDeviceMonitor * monitor,
const gchar * classes, GstCaps * caps)
{
GList *factories = NULL;
guint i;
struct DeviceFilter *filter;
guint id = 0;
gboolean matched = FALSE;
g_return_if_fail (GST_IS_DEVICE_MONITOR (monitor));
g_return_if_fail (!monitor->priv->started);
g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), 0);
g_return_val_if_fail (!monitor->priv->started, 0);
GST_OBJECT_LOCK (monitor);
if (!strcmp (monitor->priv->classes, classes)) {
GST_OBJECT_UNLOCK (monitor);
return;
}
g_free (monitor->priv->classes);
monitor->priv->classes = g_strdup (classes);
filter = g_slice_new0 (struct DeviceFilter);
filter->id = monitor->priv->last_id++;
if (caps)
filter->caps = gst_caps_ref (caps);
else
filter->caps = gst_caps_new_any ();
if (classes)
filter->classesv = g_strsplit (classes, "/", 0);
factories = gst_device_provider_factory_list_get_device_providers (classes,
1);
for (i = 0; i < monitor->priv->providers->len; i++) {
GstDeviceProvider *provider;
GstDeviceProviderFactory *f;
GList *item;
provider = g_ptr_array_index (monitor->priv->providers, i);
f = gst_device_provider_get_factory (provider);
item = g_list_find (factories, f);
if (item) {
/* If the item is in our list, then remove it from the list of factories,
* we don't have it to re-create it later
*/
factories = g_list_remove_link (factories, item);
gst_object_unref (f);
} else {
/* If it's not in our list, them remove it from the list of providers.
*/
monitor->priv->cookie++;
gst_device_monitor_remove (monitor, i);
i--;
}
}
factories = gst_device_provider_factory_list_get_device_providers (1);
while (factories) {
GstDeviceProviderFactory *factory = factories->data;
GstDeviceProvider *provider;
factories = g_list_remove (factories, factory);
provider = gst_device_provider_factory_get (factory);
if (provider) {
GstBus *bus = gst_device_provider_get_bus (provider);
if (gst_device_provider_factory_has_classesv (factory, filter->classesv)) {
GstDeviceProvider *provider;
gst_bus_enable_sync_message_emission (bus);
g_signal_connect (bus, "sync-message",
G_CALLBACK (bus_sync_message), monitor);
gst_object_unref (bus);
g_ptr_array_add (monitor->priv->providers, provider);
monitor->priv->cookie++;
provider = gst_device_provider_factory_get (factory);
if (provider) {
guint i;
for (i = 0; i < monitor->priv->providers->len; i++) {
if (g_ptr_array_index (monitor->priv->providers, i) == provider) {
gst_object_unref (provider);
provider = NULL;
matched = TRUE;
break;
}
}
}
if (provider) {
GstBus *bus = gst_device_provider_get_bus (provider);
matched = TRUE;
gst_bus_enable_sync_message_emission (bus);
g_signal_connect (bus, "sync-message",
G_CALLBACK (bus_sync_message), monitor);
gst_object_unref (bus);
g_ptr_array_add (monitor->priv->providers, provider);
monitor->priv->cookie++;
}
}
factories = g_list_remove (factories, factory);
gst_object_unref (factory);
}
/* Ensure there is no leak here */
g_assert (factories == NULL);
if (matched) {
id = filter->id;
g_ptr_array_add (monitor->priv->filters, filter);
} else {
device_filter_free (filter);
}
GST_OBJECT_UNLOCK (monitor);
return id;
}
/**
* gst_device_monitor_get_classes_filter:
* @monitor: the device monitor
*
* Return the type (device classes) filter active for device filtering.
*
* Returns: string of device classes that are being filtered.
*
* Since: 1.4
*/
gchar *
gst_device_monitor_get_classes_filter (GstDeviceMonitor * monitor)
{
gchar *res;
g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), 0);
GST_OBJECT_LOCK (monitor);
res = g_strdup (monitor->priv->classes);
GST_OBJECT_UNLOCK (monitor);
return res;
}
/**
* gst_device_monitor_set_caps_filter:
* @monitor: the device monitor
* @caps: caps to filter
*
* Set caps to use as filter for devices. By default ANY caps are used,
* meaning no caps filter is active.
*
* Since: 1.4
*/
void
gst_device_monitor_set_caps_filter (GstDeviceMonitor * monitor, GstCaps * caps)
{
g_return_if_fail (GST_IS_DEVICE_MONITOR (monitor));
g_return_if_fail (GST_IS_CAPS (caps));
GST_OBJECT_LOCK (monitor);
gst_caps_replace (&monitor->priv->caps, caps);
GST_OBJECT_UNLOCK (monitor);
}
/**
* gst_device_monitor_get_caps_filter:
* gst_device_monitor_remove_filter:
* @monitor: a device monitor
* @filter_id: the id of the filter
*
* Get the #GstCaps filter set by gst_device_monitor_set_caps_filter().
* Removes a filter from the #GstDeviceMonitor using the id that was returned
* by gst_device_monitor_add_filter().
*
* Returns: (transfer full): the filter caps that are active (or ANY caps)
* Returns: %TRUE of the filter id was valid, %FALSE otherwise
*
* Since: 1.4
*/
GstCaps *
gst_device_monitor_get_caps_filter (GstDeviceMonitor * monitor)
gboolean
gst_device_monitor_remove_filter (GstDeviceMonitor * monitor, guint filter_id)
{
GstCaps *res;
guint i, j;
gboolean removed = FALSE;
g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), NULL);
g_return_val_if_fail (GST_IS_DEVICE_MONITOR (monitor), FALSE);
g_return_val_if_fail (!monitor->priv->started, FALSE);
g_return_val_if_fail (filter_id > 0, FALSE);
GST_OBJECT_LOCK (monitor);
res = gst_caps_ref (monitor->priv->caps);
for (i = 0; i < monitor->priv->filters->len; i++) {
struct DeviceFilter *filter = g_ptr_array_index (monitor->priv->filters, i);
if (filter->id == filter_id) {
g_ptr_array_remove_index (monitor->priv->filters, i);
removed = TRUE;
break;
}
}
if (removed) {
for (i = 0; i < monitor->priv->providers->len; i++) {
GstDeviceProvider *provider =
g_ptr_array_index (monitor->priv->providers, i);
GstDeviceProviderFactory *factory =
gst_device_provider_get_factory (provider);
gboolean valid = FALSE;
for (j = 0; j < monitor->priv->filters->len; j++) {
struct DeviceFilter *filter =
g_ptr_array_index (monitor->priv->filters, j);
if (gst_device_provider_factory_has_classesv (factory,
filter->classesv)) {
valid = TRUE;
break;
}
}
if (!valid) {
monitor->priv->cookie++;
gst_device_monitor_remove (monitor, i);
i--;
}
}
}
GST_OBJECT_UNLOCK (monitor);
return res;
return removed;
}
/**
* gst_device_monitor_new:
*

15
gst/gstdevicemonitor.h
View file

@ -89,16 +89,11 @@ gboolean gst_device_monitor_start (GstDeviceMonitor * monitor);
void gst_device_monitor_stop (GstDeviceMonitor * monitor);
void gst_device_monitor_set_classes_filter (GstDeviceMonitor * monitor,
const gchar * classes);
gchar * gst_device_monitor_get_classes_filter (GstDeviceMonitor * monitor);
void gst_device_monitor_set_caps_filter (GstDeviceMonitor * monitor,
GstCaps * caps);
GstCaps * gst_device_monitor_get_caps_filter (GstDeviceMonitor * monitor);
guint gst_device_monitor_add_filter (GstDeviceMonitor * monitor,
const gchar * classes,
GstCaps * caps);
gboolean gst_device_monitor_remove_filter (GstDeviceMonitor * monitor,
guint filter_id);
G_END_DECLS

2
gst/gstdeviceprovider.c
View file

@ -21,7 +21,7 @@
/**
* SECTION:gstdeviceprovider
* @short_description: A device provider, monitor and prober
* @short_description: A device provider
* @see_also: #GstDevice, #GstGlobalDeviceMonitor
*
* A #GstDeviceProvider subclass is provided by a plugin that handles devices

40
gst/gstdeviceproviderfactory.c
View file

@ -537,57 +537,37 @@ gst_device_provider_factory_has_classes (GstDeviceProviderFactory * factory,
return res;
}
typedef struct
{
const char *classes;
GstRank minrank;
} FilterData;
static gboolean
device_provider_filter (GstPluginFeature * feature, FilterData * data)
device_provider_filter (GstPluginFeature * feature, GstRank * minrank)
{
gboolean res;
/* we only care about device provider factories */
if (G_UNLIKELY (!GST_IS_DEVICE_PROVIDER_FACTORY (feature)))
return FALSE;
res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
gst_device_provider_factory_has_classes (GST_DEVICE_PROVIDER_FACTORY_CAST
(feature), data->classes);
return res;
return (gst_plugin_feature_get_rank (feature) >= *minrank);
}
/**
* gst_device_provider_factory_list_get_device_providers:
* @classes: a "/" separate list of klasses to match, only match if all classes
* are matched
* @minrank: Minimum rank
*
* Get a list of factories that match all of the given @classes. Only
* device providers with a rank greater or equal to @minrank will be
* returned. The list of factories is returned by decreasing rank.
* Get a list of factories with a rank greater or equal to @minrank.
* The list of factories is returned by decreasing rank.
*
* Returns: (transfer full) (element-type Gst.DeviceProviderFactory): a #GList of
* #GstDeviceProviderFactory device providers. Use gst_plugin_feature_list_free() after
* usage.
* Returns: (transfer full) (element-type Gst.DeviceProviderFactory):
* a #GList of #GstDeviceProviderFactory device providers. Use
* gst_plugin_feature_list_free() after usage.
*
* Since: 1.4
*/
GList *gst_device_provider_factory_list_get_device_providers
(const gchar * classes, GstRank minrank)
GList *
gst_device_provider_factory_list_get_device_providers (GstRank minrank)
{
GList *result;
FilterData data;
/* prepare type */
data.classes = classes;
data.minrank = minrank;
/* get the feature list using the filter */
result = gst_registry_feature_filter (gst_registry_get (),
(GstPluginFeatureFilter) device_provider_filter, FALSE, &data);
(GstPluginFeatureFilter) device_provider_filter, FALSE, &minrank);
/* sort on rank and name */
result = g_list_sort (result, gst_plugin_feature_rank_compare_func);

6
gst/gstdeviceproviderfactory.h
View file

@ -80,10 +80,10 @@ gboolean gst_device_provider_factory_has_classesv (GstDeviceProviderFactory
gchar ** classes);
gboolean gst_device_provider_factory_has_classes (GstDeviceProviderFactory *factory,
const gchar * classes);
const gchar * classes);
GList * gst_device_provider_factory_list_get_device_providers (const gchar *classes,
GstRank minrank) G_GNUC_MALLOC;
GList * gst_device_provider_factory_list_get_device_providers (
GstRank minrank) G_GNUC_MALLOC;
G_END_DECLS

6
win32/common/libgstreamer.def
View file

@ -415,14 +415,12 @@ EXPORTS
gst_device_get_type
gst_device_has_classes
gst_device_has_classesv
gst_device_monitor_add_filter
gst_device_monitor_get_bus
gst_device_monitor_get_caps_filter
gst_device_monitor_get_classes_filter
gst_device_monitor_get_devices
gst_device_monitor_get_type
gst_device_monitor_new
gst_device_monitor_set_caps_filter
gst_device_monitor_set_classes_filter
gst_device_monitor_remove_filter
gst_device_monitor_start
gst_device_monitor_stop
gst_device_provider_can_monitor