// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git)
// DO NOT EDIT

use crate::{ClockTime, Object};
use glib::{
    prelude::*,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};
use std::boxed::Box as Box_;

glib::wrapper! {
    /// GStreamer uses a global clock to synchronize the plugins in a pipeline.
    /// Different clock implementations are possible by implementing this abstract
    /// base class or, more conveniently, by subclassing [`SystemClock`][crate::SystemClock].
    ///
    /// The [`Clock`][crate::Clock] returns a monotonically increasing time with the method
    /// [`ClockExt::time()`][crate::prelude::ClockExt::time()]. Its accuracy and base time depend on the specific
    /// clock implementation but time is always expressed in nanoseconds. Since the
    /// baseline of the clock is undefined, the clock time returned is not
    /// meaningful in itself, what matters are the deltas between two clock times.
    /// The time returned by a clock is called the absolute time.
    ///
    /// The pipeline uses the clock to calculate the running time. Usually all
    /// renderers synchronize to the global clock using the buffer timestamps, the
    /// [`EventType::Segment`][crate::EventType::Segment] events and the element's base time, see [`Pipeline`][crate::Pipeline].
    ///
    /// A clock implementation can support periodic and single shot clock
    /// notifications both synchronous and asynchronous.
    ///
    /// One first needs to create a `GstClockID` for the periodic or single shot
    /// notification using [`ClockExtManual::new_single_shot_id()`][crate::prelude::ClockExtManual::new_single_shot_id()] or
    /// [`ClockExtManual::new_periodic_id()`][crate::prelude::ClockExtManual::new_periodic_id()].
    ///
    /// To perform a blocking wait for the specific time of the `GstClockID` use
    /// `gst_clock_id_wait()`. To receive a callback when the specific time is reached
    /// in the clock use `gst_clock_id_wait_async()`. Both these calls can be
    /// interrupted with the `gst_clock_id_unschedule()` call. If the blocking wait is
    /// unscheduled a return value of [`ClockReturn::Unscheduled`][crate::ClockReturn::Unscheduled] is returned.
    ///
    /// Periodic callbacks scheduled async will be repeatedly called automatically
    /// until they are unscheduled. To schedule a sync periodic callback,
    /// `gst_clock_id_wait()` should be called repeatedly.
    ///
    /// The async callbacks can happen from any thread, either provided by the core
    /// or from a streaming thread. The application should be prepared for this.
    ///
    /// A `GstClockID` that has been unscheduled cannot be used again for any wait
    /// operation, a new `GstClockID` should be created and the old unscheduled one
    /// should be destroyed with `gst_clock_id_unref()`.
    ///
    /// It is possible to perform a blocking wait on the same `GstClockID` from
    /// multiple threads. However, registering the same `GstClockID` for multiple
    /// async notifications is not possible, the callback will only be called for
    /// the thread registering the entry last.
    ///
    /// None of the wait operations unref the `GstClockID`, the owner is responsible
    /// for unreffing the ids itself. This holds for both periodic and single shot
    /// notifications. The reason being that the owner of the `GstClockID` has to
    /// keep a handle to the `GstClockID` to unblock the wait on FLUSHING events or
    /// state changes and if the entry would be unreffed automatically, the handle
    /// might become invalid without any notification.
    ///
    /// These clock operations do not operate on the running time, so the callbacks
    /// will also occur when not in PLAYING state as if the clock just keeps on
    /// running. Some clocks however do not progress when the element that provided
    /// the clock is not PLAYING.
    ///
    /// When a clock has the [`ClockFlags::CAN_SET_MASTER`][crate::ClockFlags::CAN_SET_MASTER] flag set, it can be
    /// slaved to another [`Clock`][crate::Clock] with [`ClockExt::set_master()`][crate::prelude::ClockExt::set_master()]. The clock will
    /// then automatically be synchronized to this master clock by repeatedly
    /// sampling the master clock and the slave clock and recalibrating the slave
    /// clock with [`ClockExt::set_calibration()`][crate::prelude::ClockExt::set_calibration()]. This feature is mostly useful for
    /// plugins that have an internal clock but must operate with another clock
    /// selected by the [`Pipeline`][crate::Pipeline]. They can track the offset and rate difference
    /// of their internal clock relative to the master clock by using the
    /// [`ClockExt::calibration()`][crate::prelude::ClockExt::calibration()] function.
    ///
    /// The master/slave synchronisation can be tuned with the [`timeout`][struct@crate::Clock#timeout],
    /// [`window-size`][struct@crate::Clock#window-size] and [`window-threshold`][struct@crate::Clock#window-threshold] properties.
    /// The [`timeout`][struct@crate::Clock#timeout] property defines the interval to sample the master
    /// clock and run the calibration functions. [`window-size`][struct@crate::Clock#window-size] defines the
    /// number of samples to use when calibrating and [`window-threshold`][struct@crate::Clock#window-threshold]
    /// defines the minimum number of samples before the calibration is performed.
    ///
    /// This is an Abstract Base Class, you cannot instantiate it.
    ///
    /// ## Properties
    ///
    ///
    /// #### `timeout`
    ///  Readable | Writeable
    ///
    ///
    /// #### `window-size`
    ///  Readable | Writeable
    ///
    ///
    /// #### `window-threshold`
    ///  Readable | Writeable
    /// <details><summary><h4>Object</h4></summary>
    ///
    ///
    /// #### `name`
    ///  Readable | Writeable | Construct
    ///
    ///
    /// #### `parent`
    ///  The parent of the object. Please note, that when changing the 'parent'
    /// property, we don't emit [`notify`][struct@crate::glib::Object#notify] and [`deep-notify`][struct@crate::Object#deep-notify]
    /// signals due to locking issues. In some cases one can use
    /// [`element-added`][struct@crate::Bin#element-added] or [`element-removed`][struct@crate::Bin#element-removed] signals on the parent to
    /// achieve a similar effect.
    ///
    /// Readable | Writeable
    /// </details>
    ///
    /// ## Signals
    ///
    ///
    /// #### `synced`
    ///  Signaled on clocks with [`ClockFlags::NEEDS_STARTUP_SYNC`][crate::ClockFlags::NEEDS_STARTUP_SYNC] set once
    /// the clock is synchronized, or when it completely lost synchronization.
    /// This signal will not be emitted on clocks without the flag.
    ///
    /// This signal will be emitted from an arbitrary thread, most likely not
    /// the application's main thread.
    ///
    ///
    /// <details><summary><h4>Object</h4></summary>
    ///
    ///
    /// #### `deep-notify`
    ///  The deep notify signal is used to be notified of property changes. It is
    /// typically attached to the toplevel bin to receive notifications from all
    /// the elements contained in that bin.
    ///
    /// Detailed
    /// </details>
    ///
    /// # Implements
    ///
    /// [`ClockExt`][trait@crate::prelude::ClockExt], [`GstObjectExt`][trait@crate::prelude::GstObjectExt], [`trait@glib::ObjectExt`], [`ClockExtManual`][trait@crate::prelude::ClockExtManual]
    #[doc(alias = "GstClock")]
    pub struct Clock(Object<ffi::GstClock, ffi::GstClockClass>) @extends Object;

    match fn {
        type_ => || ffi::gst_clock_get_type(),
    }
}

impl Clock {
    pub const NONE: Option<&'static Clock> = None;

    //#[doc(alias = "gst_clock_id_compare_func")]
    //pub fn id_compare_func(id1: /*Unimplemented*/Option<Basic: Pointer>, id2: /*Unimplemented*/Option<Basic: Pointer>) -> i32 {
    //    unsafe { TODO: call ffi:gst_clock_id_compare_func() }
    //}

    //#[cfg(feature = "v1_16")]
    //#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
    //#[doc(alias = "gst_clock_id_get_clock")]
    //pub fn id_get_clock(id: /*Unimplemented*/ClockID) -> Option<Clock> {
    //    unsafe { TODO: call ffi:gst_clock_id_get_clock() }
    //}

    //#[doc(alias = "gst_clock_id_get_time")]
    //pub fn id_get_time(id: /*Unimplemented*/ClockID) -> Option<ClockTime> {
    //    unsafe { TODO: call ffi:gst_clock_id_get_time() }
    //}

    //#[doc(alias = "gst_clock_id_ref")]
    //pub fn id_ref(id: /*Unimplemented*/ClockID) -> /*Unimplemented*/ClockID {
    //    unsafe { TODO: call ffi:gst_clock_id_ref() }
    //}

    //#[doc(alias = "gst_clock_id_unref")]
    //pub fn id_unref(id: /*Unimplemented*/ClockID) {
    //    unsafe { TODO: call ffi:gst_clock_id_unref() }
    //}

    //#[doc(alias = "gst_clock_id_unschedule")]
    //pub fn id_unschedule(id: /*Unimplemented*/ClockID) {
    //    unsafe { TODO: call ffi:gst_clock_id_unschedule() }
    //}

    //#[cfg(feature = "v1_16")]
    //#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
    //#[doc(alias = "gst_clock_id_uses_clock")]
    //pub fn id_uses_clock(id: /*Unimplemented*/ClockID, clock: &impl IsA<Clock>) -> bool {
    //    unsafe { TODO: call ffi:gst_clock_id_uses_clock() }
    //}

    //#[doc(alias = "gst_clock_id_wait")]
    //pub fn id_wait(id: /*Unimplemented*/ClockID) -> (Result<ClockSuccess, ClockError>, ClockTimeDiff) {
    //    unsafe { TODO: call ffi:gst_clock_id_wait() }
    //}

    //#[doc(alias = "gst_clock_id_wait_async")]
    //pub fn id_wait_async(id: /*Unimplemented*/ClockID, func: /*Unimplemented*/Fn(&Clock, impl Into<Option<ClockTime>>, /*Unimplemented*/ClockID) -> bool, user_data: /*Unimplemented*/Option<Basic: Pointer>) -> Result<ClockSuccess, ClockError> {
    //    unsafe { TODO: call ffi:gst_clock_id_wait_async() }
    //}
}

unsafe impl Send for Clock {}
unsafe impl Sync for Clock {}

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::Clock>> Sealed for T {}
}

/// Trait containing all [`struct@Clock`] methods.
///
/// # Implementors
///
/// [`Clock`][struct@crate::Clock], [`SystemClock`][struct@crate::SystemClock]
pub trait ClockExt: IsA<Clock> + sealed::Sealed + 'static {
    /// The time `master` of the master clock and the time `slave` of the slave
    /// clock are added to the list of observations. If enough observations
    /// are available, a linear regression algorithm is run on the
    /// observations and `self` is recalibrated.
    ///
    /// If this functions returns [`true`], `r_squared` will contain the
    /// correlation coefficient of the interpolation. A value of 1.0
    /// means a perfect regression was performed. This value can
    /// be used to control the sampling frequency of the master and slave
    /// clocks.
    /// ## `slave`
    /// a time on the slave
    /// ## `master`
    /// a time on the master
    ///
    /// # Returns
    ///
    /// [`true`] if enough observations were added to run the
    /// regression algorithm.
    ///
    /// ## `r_squared`
    /// a pointer to hold the result
    #[doc(alias = "gst_clock_add_observation")]
    fn add_observation(&self, slave: ClockTime, master: ClockTime) -> Option<f64> {
        unsafe {
            let mut r_squared = std::mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::gst_clock_add_observation(
                self.as_ref().to_glib_none().0,
                slave.into_glib(),
                master.into_glib(),
                r_squared.as_mut_ptr(),
            ));
            if ret {
                Some(r_squared.assume_init())
            } else {
                None
            }
        }
    }

    /// Add a clock observation to the internal slaving algorithm the same as
    /// [`add_observation()`][Self::add_observation()], and return the result of the master clock
    /// estimation, without updating the internal calibration.
    ///
    /// The caller can then take the results and call [`set_calibration()`][Self::set_calibration()]
    /// with the values, or some modified version of them.
    /// ## `slave`
    /// a time on the slave
    /// ## `master`
    /// a time on the master
    ///
    /// # Returns
    ///
    /// [`true`] if enough observations were added to run the
    /// regression algorithm.
    ///
    /// ## `r_squared`
    /// a pointer to hold the result
    ///
    /// ## `internal`
    /// a location to store the internal time
    ///
    /// ## `external`
    /// a location to store the external time
    ///
    /// ## `rate_num`
    /// a location to store the rate numerator
    ///
    /// ## `rate_denom`
    /// a location to store the rate denominator
    #[doc(alias = "gst_clock_add_observation_unapplied")]
    fn add_observation_unapplied(
        &self,
        slave: ClockTime,
        master: ClockTime,
    ) -> Option<(f64, ClockTime, ClockTime, ClockTime, ClockTime)> {
        unsafe {
            let mut r_squared = std::mem::MaybeUninit::uninit();
            let mut internal = std::mem::MaybeUninit::uninit();
            let mut external = std::mem::MaybeUninit::uninit();
            let mut rate_num = std::mem::MaybeUninit::uninit();
            let mut rate_denom = std::mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::gst_clock_add_observation_unapplied(
                self.as_ref().to_glib_none().0,
                slave.into_glib(),
                master.into_glib(),
                r_squared.as_mut_ptr(),
                internal.as_mut_ptr(),
                external.as_mut_ptr(),
                rate_num.as_mut_ptr(),
                rate_denom.as_mut_ptr(),
            ));
            if ret {
                Some((
                    r_squared.assume_init(),
                    try_from_glib(internal.assume_init()).expect("mandatory glib value is None"),
                    try_from_glib(external.assume_init()).expect("mandatory glib value is None"),
                    try_from_glib(rate_num.assume_init()).expect("mandatory glib value is None"),
                    try_from_glib(rate_denom.assume_init()).expect("mandatory glib value is None"),
                ))
            } else {
                None
            }
        }
    }

    /// Converts the given `internal` clock time to the external time, adjusting for the
    /// rate and reference time set with [`set_calibration()`][Self::set_calibration()] and making sure
    /// that the returned time is increasing. This function should be called with the
    /// clock's OBJECT_LOCK held and is mainly used by clock subclasses.
    ///
    /// This function is the reverse of [`unadjust_unlocked()`][Self::unadjust_unlocked()].
    /// ## `internal`
    /// a clock time
    ///
    /// # Returns
    ///
    /// the converted time of the clock.
    #[doc(alias = "gst_clock_adjust_unlocked")]
    fn adjust_unlocked(&self, internal: ClockTime) -> Option<ClockTime> {
        unsafe {
            from_glib(ffi::gst_clock_adjust_unlocked(
                self.as_ref().to_glib_none().0,
                internal.into_glib(),
            ))
        }
    }

    /// Gets the internal rate and reference time of `self`. See
    /// [`set_calibration()`][Self::set_calibration()] for more information.
    ///
    /// `internal`, `external`, `rate_num`, and `rate_denom` can be left [`None`] if the
    /// caller is not interested in the values.
    ///
    /// # Returns
    ///
    ///
    /// ## `internal`
    /// a location to store the internal time
    ///
    /// ## `external`
    /// a location to store the external time
    ///
    /// ## `rate_num`
    /// a location to store the rate numerator
    ///
    /// ## `rate_denom`
    /// a location to store the rate denominator
    #[doc(alias = "gst_clock_get_calibration")]
    #[doc(alias = "get_calibration")]
    fn calibration(&self) -> (ClockTime, ClockTime, ClockTime, ClockTime) {
        unsafe {
            let mut internal = std::mem::MaybeUninit::uninit();
            let mut external = std::mem::MaybeUninit::uninit();
            let mut rate_num = std::mem::MaybeUninit::uninit();
            let mut rate_denom = std::mem::MaybeUninit::uninit();
            ffi::gst_clock_get_calibration(
                self.as_ref().to_glib_none().0,
                internal.as_mut_ptr(),
                external.as_mut_ptr(),
                rate_num.as_mut_ptr(),
                rate_denom.as_mut_ptr(),
            );
            (
                try_from_glib(internal.assume_init()).expect("mandatory glib value is None"),
                try_from_glib(external.assume_init()).expect("mandatory glib value is None"),
                try_from_glib(rate_num.assume_init()).expect("mandatory glib value is None"),
                try_from_glib(rate_denom.assume_init()).expect("mandatory glib value is None"),
            )
        }
    }

    /// Gets the current internal time of the given clock. The time is returned
    /// unadjusted for the offset and the rate.
    ///
    /// # Returns
    ///
    /// the internal time of the clock. Or `GST_CLOCK_TIME_NONE` when
    /// given invalid input.
    #[doc(alias = "gst_clock_get_internal_time")]
    #[doc(alias = "get_internal_time")]
    fn internal_time(&self) -> ClockTime {
        unsafe {
            try_from_glib(ffi::gst_clock_get_internal_time(
                self.as_ref().to_glib_none().0,
            ))
            .expect("mandatory glib value is None")
        }
    }

    /// Gets the master clock that `self` is slaved to or [`None`] when the clock is
    /// not slaved to any master clock.
    ///
    /// # Returns
    ///
    /// a master [`Clock`][crate::Clock] or [`None`]
    ///  when this clock is not slaved to a master clock.
    #[doc(alias = "gst_clock_get_master")]
    #[doc(alias = "get_master")]
    #[must_use]
    fn master(&self) -> Option<Clock> {
        unsafe { from_glib_full(ffi::gst_clock_get_master(self.as_ref().to_glib_none().0)) }
    }

    /// Gets the accuracy of the clock. The accuracy of the clock is the granularity
    /// of the values returned by [`time()`][Self::time()].
    ///
    /// # Returns
    ///
    /// the resolution of the clock in units of `GstClockTime`.
    #[doc(alias = "gst_clock_get_resolution")]
    #[doc(alias = "get_resolution")]
    fn resolution(&self) -> ClockTime {
        unsafe {
            try_from_glib(ffi::gst_clock_get_resolution(
                self.as_ref().to_glib_none().0,
            ))
            .expect("mandatory glib value is None")
        }
    }

    /// Gets the current time of the given clock. The time is always
    /// monotonically increasing and adjusted according to the current
    /// offset and rate.
    ///
    /// # Returns
    ///
    /// the time of the clock. Or `GST_CLOCK_TIME_NONE` when
    /// given invalid input.
    #[doc(alias = "gst_clock_get_time")]
    #[doc(alias = "get_time")]
    fn time(&self) -> Option<ClockTime> {
        unsafe { from_glib(ffi::gst_clock_get_time(self.as_ref().to_glib_none().0)) }
    }

    /// Gets the amount of time that master and slave clocks are sampled.
    ///
    /// # Returns
    ///
    /// the interval between samples.
    #[doc(alias = "gst_clock_get_timeout")]
    #[doc(alias = "get_timeout")]
    fn timeout(&self) -> Option<ClockTime> {
        unsafe { from_glib(ffi::gst_clock_get_timeout(self.as_ref().to_glib_none().0)) }
    }

    /// Checks if the clock is currently synced, by looking at whether
    /// [`ClockFlags::NEEDS_STARTUP_SYNC`][crate::ClockFlags::NEEDS_STARTUP_SYNC] is set.
    ///
    /// # Returns
    ///
    /// [`true`] if the clock is currently synced
    #[doc(alias = "gst_clock_is_synced")]
    fn is_synced(&self) -> bool {
        unsafe { from_glib(ffi::gst_clock_is_synced(self.as_ref().to_glib_none().0)) }
    }

    /// Adjusts the rate and time of `self`. A rate of 1/1 is the normal speed of
    /// the clock. Values bigger than 1/1 make the clock go faster.
    ///
    /// `internal` and `external` are calibration parameters that arrange that
    /// [`time()`][Self::time()] should have been `external` at internal time `internal`.
    /// This internal time should not be in the future; that is, it should be less
    /// than the value of [`internal_time()`][Self::internal_time()] when this function is called.
    ///
    /// Subsequent calls to [`time()`][Self::time()] will return clock times computed as
    /// follows:
    ///
    /// **⚠️ The following code is in  C ⚠️**
    ///
    /// ``` C
    ///   time = (internal_time - internal) * rate_num / rate_denom + external
    /// ```
    ///
    /// This formula is implemented in [`adjust_unlocked()`][Self::adjust_unlocked()]. Of course, it
    /// tries to do the integer arithmetic as precisely as possible.
    ///
    /// Note that [`time()`][Self::time()] always returns increasing values so when you
    /// move the clock backwards, [`time()`][Self::time()] will report the previous value
    /// until the clock catches up.
    /// ## `internal`
    /// a reference internal time
    /// ## `external`
    /// a reference external time
    /// ## `rate_num`
    /// the numerator of the rate of the clock relative to its
    ///  internal time
    /// ## `rate_denom`
    /// the denominator of the rate of the clock
    #[doc(alias = "gst_clock_set_calibration")]
    fn set_calibration(
        &self,
        internal: ClockTime,
        external: ClockTime,
        rate_num: ClockTime,
        rate_denom: ClockTime,
    ) {
        unsafe {
            ffi::gst_clock_set_calibration(
                self.as_ref().to_glib_none().0,
                internal.into_glib(),
                external.into_glib(),
                rate_num.into_glib(),
                rate_denom.into_glib(),
            );
        }
    }

    /// Sets `master` as the master clock for `self`. `self` will be automatically
    /// calibrated so that [`time()`][Self::time()] reports the same time as the
    /// master clock.
    ///
    /// A clock provider that slaves its clock to a master can get the current
    /// calibration values with [`calibration()`][Self::calibration()].
    ///
    /// `master` can be [`None`] in which case `self` will not be slaved anymore. It will
    /// however keep reporting its time adjusted with the last configured rate
    /// and time offsets.
    /// ## `master`
    /// a master [`Clock`][crate::Clock]
    ///
    /// # Returns
    ///
    /// [`true`] if the clock is capable of being slaved to a master clock.
    /// Trying to set a master on a clock without the
    /// [`ClockFlags::CAN_SET_MASTER`][crate::ClockFlags::CAN_SET_MASTER] flag will make this function return [`false`].
    #[doc(alias = "gst_clock_set_master")]
    fn set_master(&self, master: Option<&impl IsA<Clock>>) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_clock_set_master(
                    self.as_ref().to_glib_none().0,
                    master.map(|p| p.as_ref()).to_glib_none().0
                ),
                "Failed to set master clock"
            )
        }
    }

    /// Sets the accuracy of the clock. Some clocks have the possibility to operate
    /// with different accuracy at the expense of more resource usage. There is
    /// normally no need to change the default resolution of a clock. The resolution
    /// of a clock can only be changed if the clock has the
    /// [`ClockFlags::CAN_SET_RESOLUTION`][crate::ClockFlags::CAN_SET_RESOLUTION] flag set.
    /// ## `resolution`
    /// The resolution to set
    ///
    /// # Returns
    ///
    /// the new resolution of the clock.
    #[doc(alias = "gst_clock_set_resolution")]
    fn set_resolution(&self, resolution: ClockTime) -> ClockTime {
        unsafe {
            try_from_glib(ffi::gst_clock_set_resolution(
                self.as_ref().to_glib_none().0,
                resolution.into_glib(),
            ))
            .expect("mandatory glib value is None")
        }
    }

    /// Sets `self` to synced and emits the [`synced`][struct@crate::Clock#synced] signal, and wakes up any
    /// thread waiting in [`wait_for_sync()`][Self::wait_for_sync()].
    ///
    /// This function must only be called if [`ClockFlags::NEEDS_STARTUP_SYNC`][crate::ClockFlags::NEEDS_STARTUP_SYNC]
    /// is set on the clock, and is intended to be called by subclasses only.
    /// ## `synced`
    /// if the clock is synced
    #[doc(alias = "gst_clock_set_synced")]
    fn set_synced(&self, synced: bool) {
        unsafe {
            ffi::gst_clock_set_synced(self.as_ref().to_glib_none().0, synced.into_glib());
        }
    }

    /// Sets the amount of time, in nanoseconds, to sample master and slave
    /// clocks
    /// ## `timeout`
    /// a timeout
    #[doc(alias = "gst_clock_set_timeout")]
    fn set_timeout(&self, timeout: impl Into<Option<ClockTime>>) {
        unsafe {
            ffi::gst_clock_set_timeout(self.as_ref().to_glib_none().0, timeout.into().into_glib());
        }
    }

    /// Converts the given `external` clock time to the internal time of `self`,
    /// using the rate and reference time set with [`set_calibration()`][Self::set_calibration()].
    /// This function should be called with the clock's OBJECT_LOCK held and
    /// is mainly used by clock subclasses.
    ///
    /// This function is the reverse of [`adjust_unlocked()`][Self::adjust_unlocked()].
    /// ## `external`
    /// an external clock time
    ///
    /// # Returns
    ///
    /// the internal time of the clock corresponding to `external`.
    #[doc(alias = "gst_clock_unadjust_unlocked")]
    fn unadjust_unlocked(&self, external: ClockTime) -> Option<ClockTime> {
        unsafe {
            from_glib(ffi::gst_clock_unadjust_unlocked(
                self.as_ref().to_glib_none().0,
                external.into_glib(),
            ))
        }
    }

    /// Waits until `self` is synced for reporting the current time. If `timeout`
    /// is `GST_CLOCK_TIME_NONE` it will wait forever, otherwise it will time out
    /// after `timeout` nanoseconds.
    ///
    /// For asynchronous waiting, the [`synced`][struct@crate::Clock#synced] signal can be used.
    ///
    /// This returns immediately with [`true`] if [`ClockFlags::NEEDS_STARTUP_SYNC`][crate::ClockFlags::NEEDS_STARTUP_SYNC]
    /// is not set on the clock, or if the clock is already synced.
    /// ## `timeout`
    /// timeout for waiting or `GST_CLOCK_TIME_NONE`
    ///
    /// # Returns
    ///
    /// [`true`] if waiting was successful, or [`false`] on timeout
    #[doc(alias = "gst_clock_wait_for_sync")]
    fn wait_for_sync(
        &self,
        timeout: impl Into<Option<ClockTime>>,
    ) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_clock_wait_for_sync(
                    self.as_ref().to_glib_none().0,
                    timeout.into().into_glib()
                ),
                "Timed out waiting for sync"
            )
        }
    }

    #[doc(alias = "window-size")]
    fn window_size(&self) -> i32 {
        ObjectExt::property(self.as_ref(), "window-size")
    }

    #[doc(alias = "window-size")]
    fn set_window_size(&self, window_size: i32) {
        ObjectExt::set_property(self.as_ref(), "window-size", window_size)
    }

    #[doc(alias = "window-threshold")]
    fn window_threshold(&self) -> i32 {
        ObjectExt::property(self.as_ref(), "window-threshold")
    }

    #[doc(alias = "window-threshold")]
    fn set_window_threshold(&self, window_threshold: i32) {
        ObjectExt::set_property(self.as_ref(), "window-threshold", window_threshold)
    }

    /// Signaled on clocks with [`ClockFlags::NEEDS_STARTUP_SYNC`][crate::ClockFlags::NEEDS_STARTUP_SYNC] set once
    /// the clock is synchronized, or when it completely lost synchronization.
    /// This signal will not be emitted on clocks without the flag.
    ///
    /// This signal will be emitted from an arbitrary thread, most likely not
    /// the application's main thread.
    /// ## `synced`
    /// if the clock is synced now
    #[doc(alias = "synced")]
    fn connect_synced<F: Fn(&Self, bool) + Send + Sync + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn synced_trampoline<
            P: IsA<Clock>,
            F: Fn(&P, bool) + Send + Sync + 'static,
        >(
            this: *mut ffi::GstClock,
            synced: glib::ffi::gboolean,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                Clock::from_glib_borrow(this).unsafe_cast_ref(),
                from_glib(synced),
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"synced\0".as_ptr() as *const _,
                Some(std::mem::transmute::<_, unsafe extern "C" fn()>(
                    synced_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "timeout")]
    fn connect_timeout_notify<F: Fn(&Self) + Send + Sync + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_timeout_trampoline<
            P: IsA<Clock>,
            F: Fn(&P) + Send + Sync + 'static,
        >(
            this: *mut ffi::GstClock,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Clock::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::timeout\0".as_ptr() as *const _,
                Some(std::mem::transmute::<_, unsafe extern "C" fn()>(
                    notify_timeout_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "window-size")]
    fn connect_window_size_notify<F: Fn(&Self) + Send + Sync + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_window_size_trampoline<
            P: IsA<Clock>,
            F: Fn(&P) + Send + Sync + 'static,
        >(
            this: *mut ffi::GstClock,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Clock::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::window-size\0".as_ptr() as *const _,
                Some(std::mem::transmute::<_, unsafe extern "C" fn()>(
                    notify_window_size_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "window-threshold")]
    fn connect_window_threshold_notify<F: Fn(&Self) + Send + Sync + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_window_threshold_trampoline<
            P: IsA<Clock>,
            F: Fn(&P) + Send + Sync + 'static,
        >(
            this: *mut ffi::GstClock,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Clock::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::window-threshold\0".as_ptr() as *const _,
                Some(std::mem::transmute::<_, unsafe extern "C" fn()>(
                    notify_window_threshold_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl<O: IsA<Clock>> ClockExt for O {}