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BaseSinkImpl

gstreamer_base::subclass::prelude

Trait BaseSinkImpl 

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pub trait BaseSinkImpl: ElementImpl + ObjectSubclass<Type: IsA<BaseSink>> {

Show 14 methods    // Provided methods
    fn start(&self) -> Result<(), ErrorMessage> { ... }
    fn stop(&self) -> Result<(), ErrorMessage> { ... }
    fn render(&self, buffer: &Buffer) -> Result<FlowSuccess, FlowError> { ... }
    fn prepare(&self, buffer: &Buffer) -> Result<FlowSuccess, FlowError> { ... }
    fn render_list(&self, list: &BufferList) -> Result<FlowSuccess, FlowError> { ... }
    fn prepare_list(&self, list: &BufferList) -> Result<FlowSuccess, FlowError> { ... }
    fn query(&self, query: &mut QueryRef) -> bool { ... }
    fn event(&self, event: Event) -> bool { ... }
    fn caps(&self, filter: Option<&Caps>) -> Option<Caps> { ... }
    fn set_caps(&self, caps: &Caps) -> Result<(), LoggableError> { ... }
    fn fixate(&self, caps: Caps) -> Caps { ... }
    fn unlock(&self) -> Result<(), ErrorMessage> { ... }
    fn unlock_stop(&self) -> Result<(), ErrorMessage> { ... }
    fn propose_allocation(
        &self,
        query: &mut Allocation,
    ) -> Result<(), LoggableError> { ... }

}

Provided Methods§

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fn start(&self) -> Result<(), ErrorMessage>

Start processing. Ideal for opening resources in the subclass

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fn stop(&self) -> Result<(), ErrorMessage>

Stop processing. Subclasses should use this to close resources.

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fn render(&self, buffer: &Buffer) -> Result<FlowSuccess, FlowError>

Called when a buffer should be presented or output, at the correct moment if the BaseSink has been set to sync to the clock.

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fn prepare(&self, buffer: &Buffer) -> Result<FlowSuccess, FlowError>

Called to prepare the buffer for render and preroll. This function is called before synchronisation is performed.

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fn render_list(&self, list: &BufferList) -> Result<FlowSuccess, FlowError>

Same as render but used with buffer lists instead of buffers.

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fn prepare_list(&self, list: &BufferList) -> Result<FlowSuccess, FlowError>

Called to prepare the buffer list for render_list. This function is called before synchronisation is performed.

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fn query(&self, query: &mut QueryRef) -> bool

perform a GstQuery on the element.

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fn event(&self, event: Event) -> bool

Override this to handle events arriving on the sink pad

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fn caps(&self, filter: Option<&Caps>) -> Option<Caps>

Called to get sink pad caps from the subclass.

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fn set_caps(&self, caps: &Caps) -> Result<(), LoggableError>

Notify subclass of changed caps

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fn fixate(&self, caps: Caps) -> Caps

Only useful in pull mode. Implement if you have ideas about what should be the default values for the caps you support.

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fn unlock(&self) -> Result<(), ErrorMessage>

Unlock any pending access to the resource. Subclasses should unblock any blocked function ASAP and call BaseSinkExt::wait_preroll()

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fn unlock_stop(&self) -> Result<(), ErrorMessage>

Clear the previous unlock request. Subclasses should clear any state they set during GstBaseSinkClass::unlock, and be ready to continue where they left off after BaseSinkExt::wait_preroll(), BaseSinkExt::wait() or gst_wait_sink_wait_clock() return or GstBaseSinkClass::render is called again.

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fn propose_allocation( &self, query: &mut Allocation, ) -> Result<(), LoggableError>

configure the allocation query

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§