Struct gstreamer::query::Query

pub struct Query(_);

Methods

impl Query

pub unsafe fn from_glib_none(ptr: *const GstQuery) -> Self

pub unsafe fn from_glib_full(ptr: *const GstQuery) -> Self

pub unsafe fn from_glib_borrow(ptr: *const GstQuery) -> Self

pub unsafe fn into_ptr(self) -> *mut GstQuery

pub fn copy(&self) -> Self

impl Query

pub fn new_position(fmt: Format) -> Position<Self>

Constructs a new query stream position query object. Use gst_query_unref when done with it. A position query is used to query the current position of playback in the streams, in some format.

Free-function: gst_query_unref

format

the default Format for the new query

Returns

a new Query

pub fn new_duration(fmt: Format) -> Duration<Self>

Constructs a new stream duration query object to query in the given format. Use gst_query_unref when done with it. A duration query will give the total length of the stream.

Free-function: gst_query_unref

format

the Format for this duration query

Returns

a new Query

pub fn new_latency() -> Latency<Self>

Constructs a new latency query object. Use gst_query_unref when done with it. A latency query is usually performed by sinks to compensate for additional latency introduced by elements in the pipeline.

Free-function: gst_query_unref

Returns

a Query

pub fn new_seeking(fmt: Format) -> Seeking<Self>

Constructs a new query object for querying seeking properties of the stream.

Free-function: gst_query_unref

format

the default Format for the new query

Returns

a new Query

pub fn new_segment(fmt: Format) -> Segment<Self>

Constructs a new segment query object. Use gst_query_unref when done with it. A segment query is used to discover information about the currently configured segment for playback.

Free-function: gst_query_unref

format

the Format for the new query

Returns

a new Query

pub fn new_convert<V: Into<GenericFormattedValue>>(
    value: V,
    dest_fmt: Format
) -> Convert<Self>

Constructs a new convert query object. Use gst_query_unref when done with it. A convert query is used to ask for a conversion between one format and another.

Free-function: gst_query_unref

src_format

the source Format for the new query

value

the value to convert

dest_format

the target Format

Returns

a Query

pub fn new_formats() -> Formats<Self>

Constructs a new query object for querying formats of the stream.

Free-function: gst_query_unref

Returns

a new Query

pub fn new_buffering(fmt: Format) -> Buffering<Self>

Constructs a new query object for querying the buffering status of a stream.

Free-function: gst_query_unref

format

the default Format for the new query

Returns

a new Query

pub fn new_custom(structure: Structure) -> Custom<Self>

Constructs a new custom query object. Use gst_query_unref when done with it.

Free-function: gst_query_unref

type_

the query type

structure

a structure for the query

Returns

a new Query

pub fn new_uri() -> Uri<Self>

Constructs a new query URI query object. Use gst_query_unref when done with it. An URI query is used to query the current URI that is used by the source or sink.

Free-function: gst_query_unref

Returns

a new Query

pub fn new_allocation(caps: &Caps, need_pool: bool) -> Allocation<Self>

Constructs a new query object for querying the allocation properties.

Free-function: gst_query_unref

caps

the negotiated caps

need_pool

return a pool

Returns

a new Query

pub fn new_scheduling() -> Scheduling<Self>

Constructs a new query object for querying the scheduling properties.

Free-function: gst_query_unref

Returns

a new Query

pub fn new_accept_caps(caps: &Caps) -> AcceptCaps<Self>

Constructs a new query object for querying if caps are accepted.

Free-function: gst_query_unref

caps

a fixed Caps

Returns

a new Query

pub fn new_caps(filter: Option<&Caps>) -> Caps<Self>

Constructs a new query object for querying the caps.

The CAPS query should return the allowable caps for a pad in the context of the element's state, its link to other elements, and the devices or files it has opened. These caps must be a subset of the pad template caps. In the NULL state with no links, the CAPS query should ideally return the same caps as the pad template. In rare circumstances, an object property can affect the caps returned by the CAPS query, but this is discouraged.

For most filters, the caps returned by CAPS query is directly affected by the allowed caps on other pads. For demuxers and decoders, the caps returned by the srcpad's getcaps function is directly related to the stream data. Again, the CAPS query should return the most specific caps it reasonably can, since this helps with autoplugging.

The filter is used to restrict the result caps, only the caps matching filter should be returned from the CAPS query. Specifying a filter might greatly reduce the amount of processing an element needs to do.

Free-function: gst_query_unref

filter

a filter

Returns

a new Query

pub fn new_drain() -> Drain<Self>

Constructs a new query object for querying the drain state.

Free-function: gst_query_unref

Returns

a new Query

pub fn new_context(context_type: &str) -> Context<Self>

Constructs a new query object for querying the pipeline-local context.

Free-function: gst_query_unref

context_type

Context type to query

Returns

a new Query

pub fn new_bitrate() -> Bitrate<Self>

Constructs a new query object for querying the bitrate.

Free-function: gst_query_unref

Feature: v1_16

Returns

a new Query

Methods from Deref<Target = GstRc<QueryRef>>

pub fn make_mut(&mut self) -> &mut T

pub fn get_mut(&mut self) -> Option<&mut T>

pub fn is_writable(&self) -> bool

pub fn add_parent<U: MiniObject>(&self, parent: &U)

pub fn remove_parent<U: MiniObject>(&self, parent: &U)

Trait Implementations

impl AsMutPtr for Query

unsafe fn as_mut_ptr(&self) -> *mut GstQuery

impl AsPtr for Query

unsafe fn as_ptr(&self) -> *mut GstQuery

impl AsRef<QueryRef> for Query

fn as_ref(&self) -> &QueryRef

Performs the conversion.

impl Borrow<QueryRef> for Query

fn borrow(&self) -> &QueryRef

Immutably borrows from an owned value.

impl Clone for Query

fn clone(&self) -> Query

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Query

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Deref for Query

type Target = GstRc<QueryRef>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl DerefMut for Query

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl From<AcceptCaps<Query>> for Query

fn from(concrete: AcceptCaps<Query>) -> Self

Performs the conversion.

impl From<Allocation<Query>> for Query

fn from(concrete: Allocation<Query>) -> Self

Performs the conversion.

impl From<Bitrate<Query>> for Query

fn from(concrete: Bitrate<Query>) -> Self

Performs the conversion.

impl From<Buffering<Query>> for Query

fn from(concrete: Buffering<Query>) -> Self

Performs the conversion.

impl From<Caps<Query>> for Query

fn from(concrete: Caps<Query>) -> Self

Performs the conversion.

impl From<Context<Query>> for Query

fn from(concrete: Context<Query>) -> Self

Performs the conversion.

impl From<Convert<Query>> for Query

fn from(concrete: Convert<Query>) -> Self

Performs the conversion.

impl From<Custom<Query>> for Query

fn from(concrete: Custom<Query>) -> Self

Performs the conversion.

impl From<Drain<Query>> for Query

fn from(concrete: Drain<Query>) -> Self

Performs the conversion.

impl From<Duration<Query>> for Query

fn from(concrete: Duration<Query>) -> Self

Performs the conversion.

impl From<Formats<Query>> for Query

fn from(concrete: Formats<Query>) -> Self

Performs the conversion.

impl From<GstRc<QueryRef>> for Query

fn from(rc: GstRc<QueryRef>) -> Query

Performs the conversion.

impl From<Jitter<Query>> for Query

fn from(concrete: Jitter<Query>) -> Self

Performs the conversion.

impl From<Latency<Query>> for Query

fn from(concrete: Latency<Query>) -> Self

Performs the conversion.

impl From<Other<Query>> for Query

fn from(concrete: Other<Query>) -> Self

Performs the conversion.

impl From<Position<Query>> for Query

fn from(concrete: Position<Query>) -> Self

Performs the conversion.

impl From<Rate<Query>> for Query

fn from(concrete: Rate<Query>) -> Self

Performs the conversion.

impl From<Scheduling<Query>> for Query

fn from(concrete: Scheduling<Query>) -> Self

Performs the conversion.

impl From<Seeking<Query>> for Query

fn from(concrete: Seeking<Query>) -> Self

Performs the conversion.

impl From<Segment<Query>> for Query

fn from(concrete: Segment<Query>) -> Self

Performs the conversion.

impl From<Uri<Query>> for Query

fn from(concrete: Uri<Query>) -> Self

Performs the conversion.

impl FromGlibContainerAsVec<*mut GstQuery, *const *mut GstQuery> for Query

unsafe fn from_glib_none_num_as_vec(
    ptr: *const *mut GstQuery,
    num: usize
) -> Vec<Self>

unsafe fn from_glib_container_num_as_vec(
    _: *const *mut GstQuery,
    _: usize
) -> Vec<Self>

unsafe fn from_glib_full_num_as_vec(
    _: *const *mut GstQuery,
    _: usize
) -> Vec<Self>

impl FromGlibContainerAsVec<*mut GstQuery, *mut *mut GstQuery> for Query

unsafe fn from_glib_none_num_as_vec(
    ptr: *mut *mut GstQuery,
    num: usize
) -> Vec<Self>

unsafe fn from_glib_container_num_as_vec(
    ptr: *mut *mut GstQuery,
    num: usize
) -> Vec<Self>

unsafe fn from_glib_full_num_as_vec(
    ptr: *mut *mut GstQuery,
    num: usize
) -> Vec<Self>

impl FromGlibPtrArrayContainerAsVec<*mut GstQuery, *const *mut GstQuery> for Query

unsafe fn from_glib_none_as_vec(ptr: *const *mut GstQuery) -> Vec<Self>

unsafe fn from_glib_container_as_vec(_: *const *mut GstQuery) -> Vec<Self>

unsafe fn from_glib_full_as_vec(_: *const *mut GstQuery) -> Vec<Self>

impl FromGlibPtrArrayContainerAsVec<*mut GstQuery, *mut *mut GstQuery> for Query

unsafe fn from_glib_none_as_vec(ptr: *mut *mut GstQuery) -> Vec<Self>

unsafe fn from_glib_container_as_vec(ptr: *mut *mut GstQuery) -> Vec<Self>

unsafe fn from_glib_full_as_vec(ptr: *mut *mut GstQuery) -> Vec<Self>

impl FromGlibPtrBorrow<*const GstQuery> for Query

unsafe fn from_glib_borrow(ptr: *const GstQuery) -> Self

impl FromGlibPtrBorrow<*mut GstQuery> for Query

unsafe fn from_glib_borrow(ptr: *mut GstQuery) -> Self

impl FromGlibPtrFull<*const GstQuery> for Query

unsafe fn from_glib_full(ptr: *const GstQuery) -> Self

impl FromGlibPtrFull<*mut GstQuery> for Query

unsafe fn from_glib_full(ptr: *mut GstQuery) -> Self

impl FromGlibPtrNone<*const GstQuery> for Query

unsafe fn from_glib_none(ptr: *const GstQuery) -> Self

impl FromGlibPtrNone<*mut GstQuery> for Query

unsafe fn from_glib_none(ptr: *mut GstQuery) -> Self

impl<'a> FromValueOptional<'a> for Query

unsafe fn from_value_optional(v: &'a Value) -> Option<Self>

impl GlibPtrDefault for Query

type GlibType = *mut GstQuery

impl Into<GstRc<QueryRef>> for Query

fn into(self) -> GstRc<QueryRef>

Performs the conversion.

impl SetValue for Query

unsafe fn set_value(v: &mut Value, s: &Self)

impl SetValueOptional for Query

unsafe fn set_value_optional(v: &mut Value, s: Option<&Self>)

impl StaticType for Query

fn static_type() -> Type

Returns the type identifier of Self.

impl<'a> ToGlibContainerFromSlice<'a, *const *mut GstQuery> for Query

type Storage = (Vec<Stash<'a, *mut GstQuery, Query>>, Option<Vec<*mut GstQuery>>)

fn to_glib_none_from_slice(
    t: &'a [Query]
) -> (*const *mut GstQuery, Self::Storage)

fn to_glib_container_from_slice(
    _: &'a [Query]
) -> (*const *mut GstQuery, Self::Storage)

fn to_glib_full_from_slice(_: &[Query]) -> *const *mut GstQuery

impl<'a> ToGlibContainerFromSlice<'a, *mut *mut GstQuery> for Query

type Storage = (Vec<Stash<'a, *mut GstQuery, Query>>, Option<Vec<*mut GstQuery>>)

fn to_glib_none_from_slice(
    t: &'a [Query]
) -> (*mut *mut GstQuery, Self::Storage)

fn to_glib_container_from_slice(
    t: &'a [Query]
) -> (*mut *mut GstQuery, Self::Storage)

fn to_glib_full_from_slice(t: &[Query]) -> *mut *mut GstQuery

impl<'a> ToGlibPtr<'a, *const GstQuery> for Query

type Storage = Stash<'a, *const GstQuery, GstRc<QueryRef>>

fn to_glib_none(&'a self) -> Stash<'a, *const GstQuery, Self>

Transfer: none.

fn to_glib_full(&self) -> *const GstQuery

Transfer: full.

fn to_glib_container(&'a self) -> Stash<'a, P, Self>

Transfer: container.

impl<'a> ToGlibPtr<'a, *mut GstQuery> for Query

type Storage = Stash<'a, *mut GstQuery, GstRc<QueryRef>>

fn to_glib_none(&'a self) -> Stash<'a, *mut GstQuery, Self>

Transfer: none.

fn to_glib_full(&self) -> *mut GstQuery

Transfer: full.

fn to_glib_container(&'a self) -> Stash<'a, P, Self>

Transfer: container.

impl<'a> ToGlibPtrMut<'a, *mut GstQuery> for Query

type Storage = StashMut<'a, *mut GstQuery, GstRc<QueryRef>>

fn to_glib_none_mut(&'a mut self) -> StashMut<*mut GstQuery, Self>

Transfer: none.