Struct Video
Source pub struct VideoEncoder { /* private fields */ }Expand description
This base class is for video encoders turning raw video into encoded video data.
GstVideoEncoder and subclass should cooperate as follows.
§Configuration
- Initially, GstVideoEncoder calls
startwhen the encoder element is activated, which allows subclass to perform any global setup. - GstVideoEncoder calls
set_formatto inform subclass of the format of input video data that it is about to receive. Subclass should setup for encoding and configure base class as appropriate (e.g. latency). While unlikely, it might be called more than once, if changing input parameters require reconfiguration. Baseclass will ensure that processing of current configuration is finished. - GstVideoEncoder calls
stopat end of all processing.
§Data processing
-
Base class collects input data and metadata into a frame and hands this to subclass’
handle_frame. -
If codec processing results in encoded data, subclass should call
VideoEncoderExt::finish_frame()to have encoded data pushed downstream. -
If implemented, baseclass calls subclass
pre_pushjust prior to pushing to allow subclasses to modify some metadata on the buffer. If it returns GST_FLOW_OK, the buffer is pushed downstream. -
GstVideoEncoderClass will handle both srcpad and sinkpad events. Sink events will be passed to subclass if
eventcallback has been provided.
§Shutdown phase
- GstVideoEncoder class calls
stopto inform the subclass that data parsing will be stopped.
Subclass is responsible for providing pad template caps for
source and sink pads. The pads need to be named “sink” and “src”. It should
also be able to provide fixed src pad caps in getcaps by the time it calls
VideoEncoderExt::finish_frame().
Things that subclass need to take care of:
- Provide pad templates
- Provide source pad caps before pushing the first buffer
- Accept data in
handle_frameand provide encoded results toVideoEncoderExt::finish_frame().
The qos property will enable the Quality-of-Service
features of the encoder which gather statistics about the real-time
performance of the downstream elements. If enabled, subclasses can
use VideoEncoderExt::max_encode_time() to check if input frames
are already late and drop them right away to give a chance to the
pipeline to catch up.
This is an Abstract Base Class, you cannot instantiate it.
§Properties
§min-force-key-unit-interval
Minimum interval between force-keyunit requests in nanoseconds. See
VideoEncoderExt::set_min_force_key_unit_interval() for more details.
Readable | Writeable
§qos
Readable | Writeable
Object
§name
Readable | Writeable | Construct
§parent
The parent of the object. Please note, that when changing the ‘parent’
property, we don’t emit notify and deep-notify
signals due to locking issues. In some cases one can use
GstBin::element-added or GstBin::element-removed signals on the parent to
achieve a similar effect.
Readable | Writeable
§Implements
VideoEncoderExt, gst::prelude::ElementExt, gst::prelude::ObjectExt, [trait@glib::ObjectExt], VideoEncoderExtManual
GLib type: GObject with reference counted clone semantics.
Implementations§
Source§impl VideoEncoder
impl VideoEncoder
pub const NONE: Option<&'static VideoEncoder> = None
Trait Implementations§
Source§impl Clone for VideoEncoder
impl Clone for VideoEncoder
Source§impl Debug for VideoEncoder
impl Debug for VideoEncoder
Source§impl HasParamSpec for VideoEncoder
impl HasParamSpec for VideoEncoder
type ParamSpec = ParamSpecObject
Source§type SetValue = VideoEncoder
type SetValue = VideoEncoder
Preferred value to be used as setter for the associated ParamSpec.
type BuilderFn = fn(&str) -> ParamSpecObjectBuilder<'_, VideoEncoder>
fn param_spec_builder() -> Self::BuilderFn
Source§impl Hash for VideoEncoder
impl Hash for VideoEncoder
Source§impl<T: VideoEncoderImpl> IsSubclassable<T> for VideoEncoder
impl<T: VideoEncoderImpl> IsSubclassable<T> for VideoEncoder
Source§fn class_init(klass: &mut Class<Self>)
fn class_init(klass: &mut Class<Self>)
Override the virtual methods of this class for the given subclass and do other class
initialization. Read more
Source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
Instance specific initialization. Read more
Source§impl Ord for VideoEncoder
impl Ord for VideoEncoder
Source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
Source§impl ParentClassIs for VideoEncoder
impl ParentClassIs for VideoEncoder
Source§impl<OT: ObjectType> PartialEq<OT> for VideoEncoder
impl<OT: ObjectType> PartialEq<OT> for VideoEncoder
Source§impl<OT: ObjectType> PartialOrd<OT> for VideoEncoder
impl<OT: ObjectType> PartialOrd<OT> for VideoEncoder
Source§impl StaticType for VideoEncoder
impl StaticType for VideoEncoder
Source§fn static_type() -> Type
fn static_type() -> Type
Returns the type identifier of
Self.impl Eq for VideoEncoder
impl IsA<Element> for VideoEncoder
impl IsA<Object> for VideoEncoder
impl Send for VideoEncoder
impl Sync for VideoEncoder
Auto Trait Implementations§
impl Freeze for VideoEncoder
impl RefUnwindSafe for VideoEncoder
impl Unpin for VideoEncoder
impl UnwindSafe for VideoEncoder
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Source§fn add_pad(&self, pad: &impl IsA<Pad>) -> Result<(), BoolError>
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Adds a pad (link point) to
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&self,
pad: &impl IsA<Pad>,
caps: Option<&Caps>,
) -> Option<Pad>
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Looks for an unlinked pad to which the given pad can link. It is not
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Source§fn compatible_pad_template(
&self,
compattempl: &PadTemplate,
) -> Option<PadTemplate>
fn compatible_pad_template( &self, compattempl: &PadTemplate, ) -> Option<PadTemplate>
Retrieves a pad template from
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Returns the start time of the element. The start time is the
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Source§fn static_pad(&self, name: &str) -> Option<Pad>
fn static_pad(&self, name: &str) -> Option<Pad>
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fn release_request_pad(&self, pad: &impl IsA<Pad>)
Makes the element free the previously requested pad as obtained
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fn remove_pad(&self, pad: &impl IsA<Pad>) -> Result<(), BoolError>
Removes
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&self,
templ: &PadTemplate,
name: Option<&str>,
caps: Option<&Caps>,
) -> Option<Pad>
fn request_pad( &self, templ: &PadTemplate, name: Option<&str>, caps: Option<&Caps>, ) -> Option<Pad>
Retrieves a request pad from the element according to the provided template.
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fn set_base_time(&self, time: ClockTime)
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This signals that the element will not generate more dynamic pads.
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a new
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Source§impl<O> ElementExtManual for O
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Performs a query on the given element. Read more
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Source§fn iterate_pads(&self) -> Iterator<Pad>
fn iterate_pads(&self) -> Iterator<Pad>
Retrieves an iterator of
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be freed after usage. Also more specialized iterators exists such as
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fn iterate_src_pads(&self) -> Iterator<Pad>
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Source§fn foreach_pad<F>(&self, func: F)
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&self,
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start_type: SeekType,
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Simple API to perform a seek on the given element, meaning it just seeks
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Source§fn current_running_time(&self) -> Option<ClockTime>
fn current_running_time(&self) -> Option<ClockTime>
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Source§fn request_pad_simple(&self, name: &str) -> Option<Pad>
fn request_pad_simple(&self, name: &str) -> Option<Pad>
The name of this function is confusing to people learning GStreamer.
request_pad_simple() aims at making it more explicit it is
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fn link(&self, dest: &impl IsA<Element>) -> Result<(), BoolError>
Links
self to dest. The link must be from source to
destination; the other direction will not be tried. The function looks for
existing pads that aren’t linked yet. It will request new pads if necessary.
Such pads need to be released manually when unlinking.
If multiple links are possible, only one is established. Read moreSource§fn link_filtered(
&self,
dest: &impl IsA<Element>,
filter: &Caps,
) -> Result<(), BoolError>
fn link_filtered( &self, dest: &impl IsA<Element>, filter: &Caps, ) -> Result<(), BoolError>
Links
self to dest using the given caps as filtercaps.
The link must be from source to
destination; the other direction will not be tried. The function looks for
existing pads that aren’t linked yet. It will request new pads if necessary.
If multiple links are possible, only one is established. Read moreSource§fn link_pads(
&self,
srcpadname: Option<&str>,
dest: &impl IsA<Element>,
destpadname: Option<&str>,
) -> Result<(), BoolError>
fn link_pads( &self, srcpadname: Option<&str>, dest: &impl IsA<Element>, destpadname: Option<&str>, ) -> Result<(), BoolError>
Links the two named pads of the source and destination elements.
Side effect is that if one of the pads has no parent, it becomes a
child of the parent of the other element. If they have different
parents, the link fails. Read more
Source§fn link_pads_filtered(
&self,
srcpadname: Option<&str>,
dest: &impl IsA<Element>,
destpadname: Option<&str>,
filter: &Caps,
) -> Result<(), BoolError>
fn link_pads_filtered( &self, srcpadname: Option<&str>, dest: &impl IsA<Element>, destpadname: Option<&str>, filter: &Caps, ) -> Result<(), BoolError>
Links the two named pads of the source and destination elements. Side effect
is that if one of the pads has no parent, it becomes a child of the parent of
the other element. If they have different parents, the link fails. If
caps
is not None, makes sure that the caps of the link is a subset of caps. Read moreSource§fn link_pads_full(
&self,
srcpadname: Option<&str>,
dest: &impl IsA<Element>,
destpadname: Option<&str>,
flags: PadLinkCheck,
) -> Result<(), BoolError>
fn link_pads_full( &self, srcpadname: Option<&str>, dest: &impl IsA<Element>, destpadname: Option<&str>, flags: PadLinkCheck, ) -> Result<(), BoolError>
Links the two named pads of the source and destination elements.
Side effect is that if one of the pads has no parent, it becomes a
child of the parent of the other element. If they have different
parents, the link fails. Read more
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Source§impl<O> GObjectExtManualGst for O
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Attach the
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Obtain the control-rate for this
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Unblock a given signal handler.
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&self,
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details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
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&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
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&self,
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details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value], ) -> Option<Value>
Emit signal by its name with details. Read more
Source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
Emit signal by signal id with details. Read more
Source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value], ) -> Option<Value>
Emit signal by signal id with details. Read more
Source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
Disconnect a previously connected signal handler.
Source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
Connect to the
notify signal of the object. Read moreSource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
Connect to the
notify signal of the object. Read moreSource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F,
) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
Connect to the
notify signal of the object. Read moreSource§fn notify(&self, property_name: &str)
fn notify(&self, property_name: &str)
Notify that the given property has changed its value. Read more
Source§fn notify_by_pspec(&self, pspec: &ParamSpec)
fn notify_by_pspec(&self, pspec: &ParamSpec)
Notify that the given property has changed its value. Read more
Source§fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>
fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>
Add a callback to be notified when the Object is disposed.
Source§fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where
F: FnOnce() + 'static,
fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where
F: FnOnce() + 'static,
Add a callback to be notified when the Object is disposed. Read more
Source§fn bind_property<'a, 'f, 't, O>(
&'a self,
source_property: &'a str,
target: &'a O,
target_property: &'a str,
) -> BindingBuilder<'a, 'f, 't>where
O: ObjectType,
fn bind_property<'a, 'f, 't, O>(
&'a self,
source_property: &'a str,
target: &'a O,
target_property: &'a str,
) -> BindingBuilder<'a, 'f, 't>where
O: ObjectType,
Source§unsafe fn run_dispose(&self)
unsafe fn run_dispose(&self)
Runs the dispose mechanism of the object. Read more
Source§impl<T> PropertyGet for Twhere
T: HasParamSpec,
impl<T> PropertyGet for Twhere
T: HasParamSpec,
Source§impl<T> StaticTypeExt for Twhere
T: StaticType,
impl<T> StaticTypeExt for Twhere
T: StaticType,
Source§fn ensure_type()
fn ensure_type()
Ensures that the type has been registered with the type system.
Source§impl<T> ToSendValue for T
impl<T> ToSendValue for T
Source§fn to_send_value(&self) -> SendValue
fn to_send_value(&self) -> SendValue
Returns a
SendValue clone of self.Source§impl<T> TransparentType for Twhere
T: TransparentPtrType,
impl<T> TransparentType for Twhere
T: TransparentPtrType,
type GlibType = <T as GlibPtrDefault>::GlibType
Source§impl<T> TryFromClosureReturnValue for Twhere
T: for<'a> FromValue<'a> + StaticType + 'static,
impl<T> TryFromClosureReturnValue for Twhere
T: for<'a> FromValue<'a> + StaticType + 'static,
Source§impl<O> VideoEncoderExt for Owhere
O: IsA<VideoEncoder>,
impl<O> VideoEncoderExt for Owhere
O: IsA<VideoEncoder>,
Source§fn allocate_output_buffer(&self, size: usize) -> Buffer
fn allocate_output_buffer(&self, size: usize) -> Buffer
Helper function that allocates a buffer to hold an encoded video frame
for
self’s current VideoCodecState. Read moreSource§fn drop_frame(&self, frame: VideoCodecFrame<'_>)
fn drop_frame(&self, frame: VideoCodecFrame<'_>)
Removes
frame from the list of pending frames, releases it
and posts a QoS message with the frame’s details on the bus.
Similar to calling finish_frame() without a buffer
attached to frame, but this function additionally stores events
from frame as pending, to be pushed out alongside the next frame
submitted via finish_frame(). Read moreSource§fn finish_frame(
&self,
frame: VideoCodecFrame<'_>,
) -> Result<FlowSuccess, FlowError>
fn finish_frame( &self, frame: VideoCodecFrame<'_>, ) -> Result<FlowSuccess, FlowError>
frame must have a valid encoded data buffer, whose metadata fields
are then appropriately set according to frame data or no buffer at
all if the frame should be dropped.
It is subsequently pushed downstream or provided to pre_push.
In any case, the frame is considered finished and released. Read moreSource§fn max_encode_time(&self, frame: &VideoCodecFrame<'_>) -> ClockTimeDiff
fn max_encode_time(&self, frame: &VideoCodecFrame<'_>) -> ClockTimeDiff
Determines maximum possible encoding time for
frame that will
allow it to encode and arrive in time (as determined by QoS events).
In particular, a negative result means encoding in time is no longer possible
and should therefore occur as soon/skippy as possible. Read moreSource§fn min_force_key_unit_interval(&self) -> Option<ClockTime>
fn min_force_key_unit_interval(&self) -> Option<ClockTime>
Returns the minimum force-keyunit interval, see
set_min_force_key_unit_interval()
for more details. Read moreSource§fn is_qos_enabled(&self) -> bool
fn is_qos_enabled(&self) -> bool
Checks if
self is currently configured to handle Quality-of-Service
events from downstream. Read moreSource§fn merge_tags(&self, tags: Option<&TagList>, mode: TagMergeMode)
fn merge_tags(&self, tags: Option<&TagList>, mode: TagMergeMode)
Sets the video encoder tags and how they should be merged with any
upstream stream tags. This will override any tags previously-set
with
merge_tags(). Read moreSource§fn proxy_getcaps(&self, caps: Option<&Caps>, filter: Option<&Caps>) -> Caps
fn proxy_getcaps(&self, caps: Option<&Caps>, filter: Option<&Caps>) -> Caps
Returns caps that express
caps (or sink template caps if caps == NULL)
restricted to resolution/format/… combinations supported by downstream
elements (e.g. muxers). Read moreSource§fn release_frame(&self, frame: VideoCodecFrame<'_>)
fn release_frame(&self, frame: VideoCodecFrame<'_>)
Removes
frame from list of pending frames and releases it, similar
to calling finish_frame() without a buffer attached
to the frame, but does not post a QoS message or do any additional
processing. Events from frame are moved to the pending events list. Read moreSource§fn set_min_force_key_unit_interval(
&self,
interval: impl Into<Option<ClockTime>>,
)
fn set_min_force_key_unit_interval( &self, interval: impl Into<Option<ClockTime>>, )
Sets the minimum interval for requesting keyframes based on force-keyunit
events. Setting this to 0 will allow to handle every event, setting this to
GST_CLOCK_TIME_NONE causes force-keyunit events to be ignored. Read moreSource§fn set_min_pts(&self, min_pts: impl Into<Option<ClockTime>>)
fn set_min_pts(&self, min_pts: impl Into<Option<ClockTime>>)
Request minimal value for PTS passed to handle_frame. Read more
Source§fn set_qos_enabled(&self, enabled: bool)
fn set_qos_enabled(&self, enabled: bool)
Configures
self to handle Quality-of-Service events from downstream. Read morefn is_qos(&self) -> bool
fn set_qos(&self, qos: bool)
fn connect_min_force_key_unit_interval_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId
fn connect_qos_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId
Source§impl<O> VideoEncoderExtManual for Owhere
O: IsA<VideoEncoder>,
impl<O> VideoEncoderExtManual for Owhere
O: IsA<VideoEncoder>,
Source§fn allocate_output_frame(
&self,
frame: &mut VideoCodecFrame<'_>,
size: usize,
) -> Result<FlowSuccess, FlowError>
fn allocate_output_frame( &self, frame: &mut VideoCodecFrame<'_>, size: usize, ) -> Result<FlowSuccess, FlowError>
Helper function that allocates a buffer to hold an encoded video frame for
self’s
current VideoCodecState. Subclass should already have configured video
state and set src pad caps. Read moreSource§fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame<'_>>
fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame<'_>>
Get a pending unfinished
VideoCodecFrame Read moreSource§fn frames(&self) -> Vec<VideoCodecFrame<'_>>
fn frames(&self) -> Vec<VideoCodecFrame<'_>>
Get all pending unfinished
VideoCodecFrame Read moreSource§fn oldest_frame(&self) -> Option<VideoCodecFrame<'_>>
fn oldest_frame(&self) -> Option<VideoCodecFrame<'_>>
Get the oldest unfinished pending
VideoCodecFrame Read moreSource§fn allocator(&self) -> (Option<Allocator>, AllocationParams)
fn allocator(&self) -> (Option<Allocator>, AllocationParams)
Lets
VideoEncoder sub-classes to know the memory allocator
used by the base class and its params. Read moreSource§fn finish_subframe(
&self,
frame: &VideoCodecFrame<'_>,
) -> Result<FlowSuccess, FlowError>
fn finish_subframe( &self, frame: &VideoCodecFrame<'_>, ) -> Result<FlowSuccess, FlowError>
If multiple subframes are produced for one input frame then use this method
for each subframe, except for the last one. Before calling this function,
you need to fill frame->output_buffer with the encoded buffer to push. Read more
Source§fn latency(&self) -> (ClockTime, Option<ClockTime>)
fn latency(&self) -> (ClockTime, Option<ClockTime>)
Query the configured encoding latency. Results will be returned via
min_latency and max_latency. Read moreSource§fn set_latency(
&self,
min_latency: ClockTime,
max_latency: impl Into<Option<ClockTime>>,
)
fn set_latency( &self, min_latency: ClockTime, max_latency: impl Into<Option<ClockTime>>, )
Informs baseclass of encoding latency. If the provided values changed from
previously provided ones, this will also post a LATENCY message on the bus
so the pipeline can reconfigure its global latency. Read more
Source§fn output_state(&self) -> Option<VideoCodecState<'static, Readable>>
fn output_state(&self) -> Option<VideoCodecState<'static, Readable>>
Get the current
VideoCodecState Read moreSource§fn set_output_state(
&self,
caps: Caps,
reference: Option<&VideoCodecState<'_, Readable>>,
) -> Result<VideoCodecState<'_, InNegotiation<'_>>, FlowError>
fn set_output_state( &self, caps: Caps, reference: Option<&VideoCodecState<'_, Readable>>, ) -> Result<VideoCodecState<'_, InNegotiation<'_>>, FlowError>
Creates a new
VideoCodecState with the specified caps as the output state
for the encoder.
Any previously set output state on self will be replaced by the newly
created one. Read moreSource§fn negotiate<'a>(
&'a self,
output_state: VideoCodecState<'a, InNegotiation<'a>>,
) -> Result<(), FlowError>
fn negotiate<'a>( &'a self, output_state: VideoCodecState<'a, InNegotiation<'a>>, ) -> Result<(), FlowError>
Negotiate with downstream elements to currently configured
VideoCodecState.
Unmark GST_PAD_FLAG_NEED_RECONFIGURE in any case. But mark it again if
negotiate fails. Read moreSource§fn set_headers(&self, headers: impl IntoIterator<Item = Buffer>)
fn set_headers(&self, headers: impl IntoIterator<Item = Buffer>)
Set the codec headers to be sent downstream whenever requested. Read more