Struct gstreamer::TypeFindFactory[−][src]

pub struct TypeFindFactory(_);

These functions allow querying information about registered typefind functions. How to create and register these functions is described in the section “Writing typefind functions”</link>.

The following example shows how to write a very simple typefinder that identifies the given data. You can get quite a bit more complicated than that though.

  typedef struct {
    guint8 *data;
    guint size;
    guint probability;
    GstCaps *data;
  } MyTypeFind;
  static void
  my_peek (gpointer data, gint64 offset, guint size)
  {
    MyTypeFind *find = (MyTypeFind *) data;
    if (offset &gt;= 0 &amp;&amp; offset + size &lt;= find->size) {
      return find->data + offset;
    }
    return NULL;
  }
  static void
  my_suggest (gpointer data, guint probability, GstCaps *caps)
  {
    MyTypeFind *find = (MyTypeFind *) data;
    if (probability &gt; find->probability) {
      find->probability = probability;
      gst_caps_replace (&amp;find->caps, caps);
    }
  }
  static GstCaps *
  find_type (guint8 *data, guint size)
  {
    GList *walk, *type_list;
    MyTypeFind find = {data, size, 0, NULL};
    GstTypeFind gst_find = {my_peek, my_suggest, &amp;find, };
    walk = type_list = gst_type_find_factory_get_list ();
    while (walk) {
      GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
      walk = g_list_next (walk)
      gst_type_find_factory_call_function (factory, &amp;gst_find);
    }
    g_list_free (type_list);
    return find.caps;
  };

Implements

crate::prelude::PluginFeatureExt, crate::prelude::GstObjectExt, glib::object::ObjectExt, crate::prelude::PluginFeatureExtManual

Implementations

impl TypeFindFactory[src]

pub fn caps(&self) -> Option<Caps>[src]

Gets the crate::Caps associated with a typefind factory.

Returns

the crate::Caps associated with this factory

pub fn extensions(&self) -> Vec<GString>[src]

Gets the extensions associated with a crate::TypeFindFactory. The returned array should not be changed. If you need to change stuff in it, you should copy it using g_strdupv(). This function may return None to indicate a 0-length list.

Returns

a None-terminated array of extensions associated with this factory

pub fn has_function(&self) -> bool[src]

Check whether the factory has a typefind function. Typefind factories without typefind functions are a last-effort fallback mechanism to e.g. assume a certain media type based on the file extension.

Returns

true if the factory has a typefind functions set, otherwise false

pub fn list() -> Vec<TypeFindFactory>[src]

Gets the list of all registered typefind factories. You must free the list using [crate::PluginFeature::list_free()].

The returned factories are sorted by highest rank first, and then by factory name.

Free-function: gst_plugin_feature_list_free

Returns

the list of all registered crate::TypeFindFactory.

impl TypeFindFactory[src]

pub fn call_function(&self, find: &mut dyn TypeFindImpl)[src]

Calls the GstTypeFindFunction associated with this factory.

find

a properly setup crate::TypeFind entry. The get_data and suggest_type members must be set.

Trait Implementations

impl Clone for TypeFindFactory[src]

fn clone(&self) -> TypeFindFactory[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Debug for TypeFindFactory[src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter. Read more

impl Hash for TypeFindFactory[src]

fn hash<__H: Hasher>(&self, state: &mut __H)[src]

Feeds this value into the given Hasher. Read more

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 1.3.0[src]

Feeds a slice of this type into the given Hasher. Read more

impl Ord for TypeFindFactory[src]

fn cmp(&self, other: &TypeFindFactory) -> Ordering[src]

This method returns an Ordering between self and other. Read more

#[must_use]
fn max(self, other: Self) -> Self1.21.0[src]

Compares and returns the maximum of two values. Read more

#[must_use]
fn min(self, other: Self) -> Self1.21.0[src]

Compares and returns the minimum of two values. Read more

#[must_use]
fn clamp(self, min: Self, max: Self) -> Self1.50.0[src]

Restrict a value to a certain interval. Read more

impl ParentClassIs for TypeFindFactory[src]

type Parent = PluginFeature

impl<T: ObjectType> PartialEq<T> for TypeFindFactory[src]

fn eq(&self, other: &T) -> bool[src]

This method tests for self and other values to be equal, and is used by ==. Read more

#[must_use]
fn ne(&self, other: &Rhs) -> bool1.0.0[src]

This method tests for !=.

impl<T: ObjectType> PartialOrd<T> for TypeFindFactory[src]

fn partial_cmp(&self, other: &T) -> Option<Ordering>[src]

This method returns an ordering between self and other values if one exists. Read more

#[must_use]
fn lt(&self, other: &Rhs) -> bool1.0.0[src]

This method tests less than (for self and other) and is used by the < operator. Read more

#[must_use]
fn le(&self, other: &Rhs) -> bool1.0.0[src]

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

#[must_use]
fn gt(&self, other: &Rhs) -> bool1.0.0[src]

This method tests greater than (for self and other) and is used by the > operator. Read more

#[must_use]
fn ge(&self, other: &Rhs) -> bool1.0.0[src]

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl StaticType for TypeFindFactory[src]

fn static_type() -> Type[src]

Returns the type identifier of Self.

impl Eq for TypeFindFactory[src]

impl IsA<Object> for TypeFindFactory[src]

impl IsA<PluginFeature> for TypeFindFactory[src]

impl Send for TypeFindFactory[src]

impl StructuralEq for TypeFindFactory[src]

impl Sync for TypeFindFactory[src]

Auto Trait Implementations

impl RefUnwindSafe for TypeFindFactory

impl Unpin for TypeFindFactory

impl UnwindSafe for TypeFindFactory

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> Cast for T where
    T: ObjectType, [src]

fn upcast<T>(self) -> T where
    Self: IsA<T>,
    T: ObjectType, [src]

Upcasts an object to a superclass or interface T. Read more

fn upcast_ref<T>(&self) -> &T where
    Self: IsA<T>,
    T: ObjectType, [src]

Upcasts an object to a reference of its superclass or interface T. Read more

fn downcast<T>(self) -> Result<T, Self> where
    Self: CanDowncast<T>,
    T: ObjectType, [src]

Tries to downcast to a subclass or interface implementor T. Read more

fn downcast_ref<T>(&self) -> Option<&T> where
    Self: CanDowncast<T>,
    T: ObjectType, [src]

Tries to downcast to a reference of its subclass or interface implementor T. Read more

fn dynamic_cast<T>(self) -> Result<T, Self> where
    T: ObjectType, [src]

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

fn dynamic_cast_ref<T>(&self) -> Option<&T> where
    T: ObjectType, [src]

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

unsafe fn unsafe_cast<T>(self) -> T where
    T: ObjectType, [src]

Casts to T unconditionally. Read more

unsafe fn unsafe_cast_ref<T>(&self) -> &T where
    T: ObjectType, [src]

Casts to &T unconditionally. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ObjectExt for T where
    T: ObjectType, [src]

pub fn is<U>(&self) -> bool where
    U: StaticType, [src]

Returns true if the object is an instance of (can be cast to) T.

pub fn type_(&self) -> Type[src]

pub fn object_class(&self) -> &Class<Object>[src]

pub fn class(&self) -> &Class<T> where
    T: IsClass, [src]

pub fn class_of<U>(&self) -> Option<&Class<U>> where
    U: IsClass, [src]

pub fn interface<U>(&self) -> Option<InterfaceRef<'_, U>> where
    U: IsInterface, [src]

pub fn set_properties(
    &self,
    property_values: &[(&str, &dyn ToValue)]
) -> Result<(), BoolError>[src]

pub fn set_properties_from_value(
    &self,
    property_values: &[(&str, Value)]
) -> Result<(), BoolError>[src]

pub fn set_property<'a, N, V>(
    &self,
    property_name: N,
    value: V
) -> Result<(), BoolError> where
    V: ToValue,
    N: Into<&'a str>, [src]

pub fn set_property_from_value<'a, N>(
    &self,
    property_name: N,
    value: &Value
) -> Result<(), BoolError> where
    N: Into<&'a str>, [src]

pub fn property<'a, N>(&self, property_name: N) -> Result<Value, BoolError> where
    N: Into<&'a str>, [src]

pub unsafe fn set_qdata<QD>(&self, key: Quark, value: QD) where
    QD: 'static, [src]

Safety Read more

pub unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>> where
    QD: 'static, [src]

Safety Read more

pub unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD> where
    QD: 'static, [src]

Safety Read more

pub unsafe fn set_data<QD>(&self, key: &str, value: QD) where
    QD: 'static, [src]

Safety Read more

pub unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>> where
    QD: 'static, [src]

Safety Read more

pub unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD> where
    QD: 'static, [src]

Safety Read more

pub fn block_signal(&self, handler_id: &SignalHandlerId)[src]

pub fn unblock_signal(&self, handler_id: &SignalHandlerId)[src]

pub fn stop_signal_emission(&self, signal_name: &str)[src]

pub fn disconnect(&self, handler_id: SignalHandlerId)[src]

pub fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId where
    F: 'static + Fn(&T, &ParamSpec) + Send + Sync, [src]

pub fn connect_notify_local<F>(
    &self,
    name: Option<&str>,
    f: F
) -> SignalHandlerId where
    F: 'static + Fn(&T, &ParamSpec), [src]

pub unsafe fn connect_notify_unsafe<F>(
    &self,
    name: Option<&str>,
    f: F
) -> SignalHandlerId where
    F: Fn(&T, &ParamSpec), [src]

pub fn notify<'a, N>(&self, property_name: N) where
    N: Into<&'a str>, [src]

pub fn notify_by_pspec(&self, pspec: &ParamSpec)[src]

pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
    N: Into<&'a str>, [src]

pub fn property_type<'a, N>(&self, property_name: N) -> Option<Type> where
    N: Into<&'a str>, [src]

pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
    N: Into<&'a str>, [src]

pub fn list_properties(&self) -> Vec<ParamSpec, Global>[src]

pub fn connect<'a, N, F>(
    &self,
    signal_name: N,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
    N: Into<&'a str>, [src]

pub fn connect_id<F>(
    &self,
    signal_id: SignalId,
    details: Option<Quark>,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static, [src]

Same as connect but takes a SignalId instead of a signal name.

pub fn connect_local<'a, N, F>(
    &self,
    signal_name: N,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value> + 'static,
    N: Into<&'a str>, [src]

pub fn connect_local_id<F>(
    &self,
    signal_id: SignalId,
    details: Option<Quark>,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value> + 'static, [src]

Same as connect_local but takes a SignalId instead of a signal name.

pub unsafe fn connect_unsafe<'a, N, F>(
    &self,
    signal_name: N,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value>,
    N: Into<&'a str>, [src]

pub unsafe fn connect_unsafe_id<F>(
    &self,
    signal_id: SignalId,
    details: Option<Quark>,
    after: bool,
    callback: F
) -> Result<SignalHandlerId, BoolError> where
    F: Fn(&[Value]) -> Option<Value>, [src]

Same as connect_unsafe but takes a SignalId instead of a signal name.

pub fn emit(
    &self,
    signal_id: SignalId,
    args: &[&dyn ToValue]
) -> Result<Option<Value>, BoolError>[src]

Emit signal by signal id.

pub fn emit_with_details(
    &self,
    signal_id: SignalId,
    details: Quark,
    args: &[&dyn ToValue]
) -> Result<Option<Value>, BoolError>[src]

Emit signal with details by signal id.

pub fn emit_by_name<'a, N>(
    &self,
    signal_name: N,
    args: &[&dyn ToValue]
) -> Result<Option<Value>, BoolError> where
    N: Into<&'a str>, [src]

Emit signal by it’s name.

pub fn downgrade(&self) -> WeakRef<T>[src]

pub fn bind_property<'a, O, N, M>(
    &'a self,
    source_property: N,
    target: &'a O,
    target_property: M
) -> BindingBuilder<'a> where
    O: ObjectType,
    N: Into<&'a str>,
    M: Into<&'a str>, [src]

pub fn ref_count(&self) -> u32[src]

pub fn emit_with_values(
    &self,
    signal_id: SignalId,
    args: &[Value]
) -> Result<Option<Value>, BoolError>[src]

Same as emit but takes Value for the arguments.

pub fn emit_by_name_with_values<'a, N>(
    &self,
    signal_name: N,
    args: &[Value]
) -> Result<Option<Value>, BoolError> where
    N: Into<&'a str>, [src]

Same as emit_by_name but takes Value for the arguments.

pub fn emit_with_details_and_values(
    &self,
    signal_id: SignalId,
    details: Quark,
    args: &[Value]
) -> Result<Option<Value>, BoolError>[src]

Same as emit_with_details but takes Value for the arguments.

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> ToSendValue for T where
    T: Send + ToValue + ?Sized, [src]

pub fn to_send_value(&self) -> SendValue[src]

Returns a SendValue clone of self.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<Super, Sub> CanDowncast<Sub> for Super where
    Sub: IsA<Super>,
    Super: IsA<Super>, [src]

impl<'a, T, C> FromValueOptional<'a> for T where
    C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError>,
    T: FromValue<'a, Checker = C>, [src]