Trait gstreamer_base::subclass::base_src::BaseSrcImpl

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pub trait BaseSrcImpl: BaseSrcImplExt + ElementImpl {
Show 18 methods    // Provided methods
    fn start(&self) -> Result<(), ErrorMessage> { ... }
    fn stop(&self) -> Result<(), ErrorMessage> { ... }
    fn is_seekable(&self) -> bool { ... }
    fn size(&self) -> Option<u64> { ... }
    fn times(
        &self,
        buffer: &BufferRef
    ) -> (Option<ClockTime>, Option<ClockTime>) { ... }
    fn fill(
        &self,
        offset: u64,
        length: u32,
        buffer: &mut BufferRef
    ) -> Result<FlowSuccess, FlowError> { ... }
    fn alloc(&self, offset: u64, length: u32) -> Result<Buffer, FlowError> { ... }
    fn create(
        &self,
        offset: u64,
        buffer: Option<&mut BufferRef>,
        length: u32
    ) -> Result<CreateSuccess, FlowError> { ... }
    fn do_seek(&self, segment: &mut Segment) -> bool { ... }
    fn query(&self, query: &mut QueryRef) -> bool { ... }
    fn event(&self, event: &Event) -> bool { ... }
    fn caps(&self, filter: Option<&Caps>) -> Option<Caps> { ... }
    fn negotiate(&self) -> Result<(), LoggableError> { ... }
    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 decide_allocation(
        &self,
        query: &mut Allocation
    ) -> Result<(), LoggableError> { ... }
}

Provided Methods§

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fn size(&self) -> Option<u64>

Get the total size of the resource in the format set by BaseSrcExt::set_format().

§Returns

true if the size is available and has been set.

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fn times(&self, buffer: &BufferRef) -> (Option<ClockTime>, Option<ClockTime>)

Given buffer, return start and end time when it should be pushed out. The base class will sync on the clock using these times.

§Returns

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fn fill( &self, offset: u64, length: u32, buffer: &mut BufferRef ) -> Result<FlowSuccess, FlowError>

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fn alloc(&self, offset: u64, length: u32) -> Result<Buffer, FlowError>

Ask the subclass to allocate an output buffer with offset and size, the default implementation will use the negotiated allocator.

§Returns

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fn create( &self, offset: u64, buffer: Option<&mut BufferRef>, length: u32 ) -> Result<CreateSuccess, FlowError>

Ask the subclass to create a buffer with offset and size, the default implementation will call alloc if no allocated buf is provided and then call fill.

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fn do_seek(&self, segment: &mut Segment) -> bool

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

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

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

Called to get the caps to report.

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fn negotiate(&self) -> Result<(), LoggableError>

Negotiates src pad caps with downstream elements. Unmarks GST_PAD_FLAG_NEED_RECONFIGURE in any case. But marks it again if GstBaseSrcClass::negotiate fails.

Do not call this in the GstBaseSrcClass::fill vmethod. Call this in GstBaseSrcClass::create or in GstBaseSrcClass::alloc, before any buffer is allocated.