// Take a look at the license at the top of the repository in the LICENSE file.

use std::{fmt, ptr};

use crate::ffi;
use glib::translate::*;
use gst::prelude::*;

/// Extra buffer metadata describing image properties
///
/// This meta can also be used by downstream elements to specifiy their
/// buffer layout requirements for upstream. Upstream should try to
/// fit those requirements, if possible, in order to prevent buffer copies.
///
/// This is done by passing a custom [`gst::Structure`][crate::gst::Structure] to
/// [`gst::Query::add_allocation_meta()`][crate::gst::Query::add_allocation_meta()] when handling the ALLOCATION query.
/// This structure should be named 'video-meta' and can have the following
/// fields:
/// - padding-top (uint): extra pixels on the top
/// - padding-bottom (uint): extra pixels on the bottom
/// - padding-left (uint): extra pixels on the left side
/// - padding-right (uint): extra pixels on the right side
/// The padding fields have the same semantic as `GstVideoMeta.alignment`
/// and so represent the paddings requested on produced video buffers.
///
/// Since 1.24 it can be serialized using `gst_meta_serialize()` and
/// `gst_meta_deserialize()`.
#[repr(transparent)]
#[doc(alias = "GstVideoMeta")]
pub struct VideoMeta(ffi::GstVideoMeta);

unsafe impl Send for VideoMeta {}
unsafe impl Sync for VideoMeta {}

impl VideoMeta {
    #[doc(alias = "gst_buffer_add_video_meta")]
    pub fn add(
        buffer: &mut gst::BufferRef,
        video_frame_flags: crate::VideoFrameFlags,
        format: crate::VideoFormat,
        width: u32,
        height: u32,
    ) -> Result<gst::MetaRefMut<Self, gst::meta::Standalone>, glib::BoolError> {
        skip_assert_initialized!();

        if format == crate::VideoFormat::Unknown || format == crate::VideoFormat::Encoded {
            return Err(glib::bool_error!("Unsupported video format {}", format));
        }

        let info = crate::VideoInfo::builder(format, width, height).build()?;

        if !info.is_valid() {
            return Err(glib::bool_error!("Invalid video info"));
        }

        if buffer.size() < info.size() {
            return Err(glib::bool_error!(
                "Buffer smaller than required frame size ({} < {})",
                buffer.size(),
                info.size()
            ));
        }

        unsafe {
            let meta = ffi::gst_buffer_add_video_meta(
                buffer.as_mut_ptr(),
                video_frame_flags.into_glib(),
                format.into_glib(),
                width,
                height,
            );

            if meta.is_null() {
                return Err(glib::bool_error!("Failed to add video meta"));
            }

            Ok(Self::from_mut_ptr(buffer, meta))
        }
    }

    pub fn add_full<'a>(
        buffer: &'a mut gst::BufferRef,
        video_frame_flags: crate::VideoFrameFlags,
        format: crate::VideoFormat,
        width: u32,
        height: u32,
        offset: &[usize],
        stride: &[i32],
    ) -> Result<gst::MetaRefMut<'a, Self, gst::meta::Standalone>, glib::BoolError> {
        skip_assert_initialized!();

        if format == crate::VideoFormat::Unknown || format == crate::VideoFormat::Encoded {
            return Err(glib::bool_error!("Unsupported video format {}", format));
        }

        let n_planes = offset.len() as u32;
        let info = crate::VideoInfo::builder(format, width, height)
            .offset(offset)
            .stride(stride)
            .build()?;

        if !info.is_valid() {
            return Err(glib::bool_error!("Invalid video info"));
        }

        if buffer.size() < info.size() {
            return Err(glib::bool_error!(
                "Buffer smaller than required frame size ({} < {})",
                buffer.size(),
                info.size()
            ));
        }

        unsafe {
            let meta = ffi::gst_buffer_add_video_meta_full(
                buffer.as_mut_ptr(),
                video_frame_flags.into_glib(),
                format.into_glib(),
                width,
                height,
                n_planes,
                offset.as_ptr() as *mut _,
                stride.as_ptr() as *mut _,
            );

            if meta.is_null() {
                return Err(glib::bool_error!("Failed to add video meta"));
            }

            Ok(Self::from_mut_ptr(buffer, meta))
        }
    }

    #[doc(alias = "get_flags")]
    #[inline]
    pub fn video_frame_flags(&self) -> crate::VideoFrameFlags {
        unsafe { from_glib(self.0.flags) }
    }

    #[doc(alias = "get_format")]
    #[inline]
    pub fn format(&self) -> crate::VideoFormat {
        unsafe { from_glib(self.0.format) }
    }

    #[doc(alias = "get_id")]
    #[inline]
    pub fn id(&self) -> i32 {
        self.0.id
    }

    #[doc(alias = "get_width")]
    #[inline]
    pub fn width(&self) -> u32 {
        self.0.width
    }

    #[doc(alias = "get_height")]
    #[inline]
    pub fn height(&self) -> u32 {
        self.0.height
    }

    #[doc(alias = "get_n_planes")]
    #[inline]
    pub fn n_planes(&self) -> u32 {
        self.0.n_planes
    }

    #[doc(alias = "get_offset")]
    #[inline]
    pub fn offset(&self) -> &[usize] {
        &self.0.offset[0..(self.0.n_planes as usize)]
    }

    #[doc(alias = "get_stride")]
    #[inline]
    pub fn stride(&self) -> &[i32] {
        &self.0.stride[0..(self.0.n_planes as usize)]
    }

    #[cfg(feature = "v1_18")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
    #[doc(alias = "get_alignment")]
    #[inline]
    pub fn alignment(&self) -> crate::VideoAlignment {
        crate::VideoAlignment::new(
            self.0.alignment.padding_top,
            self.0.alignment.padding_bottom,
            self.0.alignment.padding_left,
            self.0.alignment.padding_right,
            &self.0.alignment.stride_align,
        )
    }

    /// Compute the size, in bytes, of each video plane described in `self` including
    /// any padding and alignment constraint defined in `self`->alignment.
    ///
    /// # Returns
    ///
    /// [`true`] if `self`'s alignment is valid and `plane_size` has been
    /// updated, [`false`] otherwise
    ///
    /// ## `plane_size`
    /// array used to store the plane sizes
    #[cfg(feature = "v1_18")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
    #[doc(alias = "get_plane_size")]
    #[doc(alias = "gst_video_meta_get_plane_size")]
    pub fn plane_size(&self) -> Result<[usize; crate::VIDEO_MAX_PLANES], glib::BoolError> {
        let mut plane_size = [0; crate::VIDEO_MAX_PLANES];

        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_video_meta_get_plane_size(mut_override(&self.0), &mut plane_size,),
                "Failed to get plane size"
            )?;
        }

        Ok(plane_size)
    }

    /// Compute the padded height of each plane from `self` (padded size
    /// divided by stride).
    ///
    /// It is not valid to call this function with a meta associated to a
    /// TILED video format.
    ///
    /// # Returns
    ///
    /// [`true`] if `self`'s alignment is valid and `plane_height` has been
    /// updated, [`false`] otherwise
    ///
    /// ## `plane_height`
    /// array used to store the plane height
    #[cfg(feature = "v1_18")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
    #[doc(alias = "get_plane_height")]
    #[doc(alias = "gst_video_meta_get_plane_height")]
    pub fn plane_height(&self) -> Result<[u32; crate::VIDEO_MAX_PLANES], glib::BoolError> {
        let mut plane_height = [0; crate::VIDEO_MAX_PLANES];

        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_video_meta_get_plane_height(mut_override(&self.0), &mut plane_height,),
                "Failed to get plane height"
            )?;
        }

        Ok(plane_height)
    }

    /// Set the alignment of `self` to `alignment`. This function checks that
    /// the paddings defined in `alignment` are compatible with the strides
    /// defined in `self` and will fail to update if they are not.
    /// ## `alignment`
    /// a `GstVideoAlignment`
    ///
    /// # Returns
    ///
    /// [`true`] if `alignment`'s meta has been updated, [`false`] if not
    #[cfg(feature = "v1_18")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
    #[doc(alias = "gst_video_meta_set_alignment")]
    pub fn set_alignment(
        &mut self,
        alignment: &crate::VideoAlignment,
    ) -> Result<(), glib::BoolError> {
        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_video_meta_set_alignment(&mut self.0, alignment.0),
                "Failed to set alignment on VideoMeta"
            )
        }
    }
}

unsafe impl MetaAPI for VideoMeta {
    type GstType = ffi::GstVideoMeta;

    #[doc(alias = "gst_video_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_meta_api_get_type()) }
    }
}

impl fmt::Debug for VideoMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoMeta")
            .field("id", &self.id())
            .field("video_frame_flags", &self.video_frame_flags())
            .field("format", &self.format())
            .field("width", &self.width())
            .field("height", &self.height())
            .field("n_planes", &self.n_planes())
            .field("offset", &self.offset())
            .field("stride", &self.stride())
            .finish()
    }
}

#[repr(transparent)]
#[doc(alias = "GstVideoCropMeta")]
pub struct VideoCropMeta(ffi::GstVideoCropMeta);

unsafe impl Send for VideoCropMeta {}
unsafe impl Sync for VideoCropMeta {}

impl VideoCropMeta {
    #[doc(alias = "gst_buffer_add_meta")]
    pub fn add(
        buffer: &mut gst::BufferRef,
        rect: (u32, u32, u32, u32),
    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = gst::ffi::gst_buffer_add_meta(
                buffer.as_mut_ptr(),
                ffi::gst_video_crop_meta_get_info(),
                ptr::null_mut(),
            ) as *mut ffi::GstVideoCropMeta;

            {
                let meta = &mut *meta;
                meta.x = rect.0;
                meta.y = rect.1;
                meta.width = rect.2;
                meta.height = rect.3;
            }

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_rect")]
    #[inline]
    pub fn rect(&self) -> (u32, u32, u32, u32) {
        (self.0.x, self.0.y, self.0.width, self.0.height)
    }

    #[inline]
    pub fn set_rect(&mut self, rect: (u32, u32, u32, u32)) {
        self.0.x = rect.0;
        self.0.y = rect.1;
        self.0.width = rect.2;
        self.0.height = rect.3;
    }
}

unsafe impl MetaAPI for VideoCropMeta {
    type GstType = ffi::GstVideoCropMeta;

    #[doc(alias = "gst_video_crop_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_crop_meta_api_get_type()) }
    }
}

impl fmt::Debug for VideoCropMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoCropMeta")
            .field("rect", &self.rect())
            .finish()
    }
}

#[repr(transparent)]
#[doc(alias = "GstVideoRegionOfInterestMeta")]
pub struct VideoRegionOfInterestMeta(ffi::GstVideoRegionOfInterestMeta);

unsafe impl Send for VideoRegionOfInterestMeta {}
unsafe impl Sync for VideoRegionOfInterestMeta {}

impl VideoRegionOfInterestMeta {
    #[doc(alias = "gst_buffer_add_video_region_of_interest_meta")]
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        roi_type: &str,
        rect: (u32, u32, u32, u32),
    ) -> gst::MetaRefMut<'a, Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = ffi::gst_buffer_add_video_region_of_interest_meta(
                buffer.as_mut_ptr(),
                roi_type.to_glib_none().0,
                rect.0,
                rect.1,
                rect.2,
                rect.3,
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_rect")]
    #[inline]
    pub fn rect(&self) -> (u32, u32, u32, u32) {
        (self.0.x, self.0.y, self.0.w, self.0.h)
    }

    #[doc(alias = "get_id")]
    #[inline]
    pub fn id(&self) -> i32 {
        self.0.id
    }

    #[doc(alias = "get_parent_id")]
    #[inline]
    pub fn parent_id(&self) -> i32 {
        self.0.parent_id
    }

    #[doc(alias = "get_roi_type")]
    #[inline]
    pub fn roi_type<'a>(&self) -> &'a str {
        unsafe { glib::Quark::from_glib(self.0.roi_type).as_str() }
    }

    #[doc(alias = "get_params")]
    pub fn params(&self) -> ParamsIter {
        ParamsIter {
            _meta: self,
            list: ptr::NonNull::new(self.0.params),
        }
    }

    #[doc(alias = "get_param")]
    #[inline]
    pub fn param<'b>(&'b self, name: &str) -> Option<&'b gst::StructureRef> {
        self.params().find(|s| s.name() == name)
    }

    #[inline]
    pub fn set_rect(&mut self, rect: (u32, u32, u32, u32)) {
        self.0.x = rect.0;
        self.0.y = rect.1;
        self.0.w = rect.2;
        self.0.h = rect.3;
    }

    #[inline]
    pub fn set_id(&mut self, id: i32) {
        self.0.id = id
    }

    #[inline]
    pub fn set_parent_id(&mut self, id: i32) {
        self.0.parent_id = id
    }

    #[doc(alias = "gst_video_region_of_interest_meta_add_param")]
    pub fn add_param(&mut self, s: gst::Structure) {
        unsafe {
            ffi::gst_video_region_of_interest_meta_add_param(&mut self.0, s.into_glib_ptr());
        }
    }
}

pub struct ParamsIter<'a> {
    _meta: &'a VideoRegionOfInterestMeta,
    list: Option<ptr::NonNull<glib::ffi::GList>>,
}

impl<'a> Iterator for ParamsIter<'a> {
    type Item = &'a gst::StructureRef;

    fn next(&mut self) -> Option<&'a gst::StructureRef> {
        match self.list {
            None => None,
            Some(list) => unsafe {
                self.list = ptr::NonNull::new(list.as_ref().next);
                let data = list.as_ref().data;

                let s = gst::StructureRef::from_glib_borrow(data as *const gst::ffi::GstStructure);

                Some(s)
            },
        }
    }
}

impl<'a> std::iter::FusedIterator for ParamsIter<'a> {}

unsafe impl MetaAPI for VideoRegionOfInterestMeta {
    type GstType = ffi::GstVideoRegionOfInterestMeta;

    #[doc(alias = "gst_video_region_of_interest_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_region_of_interest_meta_api_get_type()) }
    }
}

impl fmt::Debug for VideoRegionOfInterestMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoRegionOfInterestMeta")
            .field("roi_type", &self.roi_type())
            .field("rect", &self.rect())
            .field("id", &self.id())
            .field("parent_id", &self.parent_id())
            .field("params", &self.params().collect::<Vec<_>>())
            .finish()
    }
}

#[repr(transparent)]
#[doc(alias = "GstVideoAffineTransformationMeta")]
pub struct VideoAffineTransformationMeta(ffi::GstVideoAffineTransformationMeta);

unsafe impl Send for VideoAffineTransformationMeta {}
unsafe impl Sync for VideoAffineTransformationMeta {}

impl VideoAffineTransformationMeta {
    #[doc(alias = "gst_buffer_add_meta")]
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        matrix: Option<&[[f32; 4]; 4]>,
    ) -> gst::MetaRefMut<'a, Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = gst::ffi::gst_buffer_add_meta(
                buffer.as_mut_ptr(),
                ffi::gst_video_affine_transformation_meta_get_info(),
                ptr::null_mut(),
            ) as *mut ffi::GstVideoAffineTransformationMeta;

            if let Some(matrix) = matrix {
                let meta = &mut *meta;
                for (i, o) in Iterator::zip(matrix.iter().flatten(), meta.matrix.iter_mut()) {
                    *o = *i;
                }
            }

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_matrix")]
    #[inline]
    pub fn matrix(&self) -> &[[f32; 4]; 4] {
        unsafe { &*(&self.0.matrix as *const [f32; 16] as *const [[f32; 4]; 4]) }
    }

    #[inline]
    pub fn set_matrix(&mut self, matrix: &[[f32; 4]; 4]) {
        for (i, o) in Iterator::zip(matrix.iter().flatten(), self.0.matrix.iter_mut()) {
            *o = *i;
        }
    }

    #[doc(alias = "gst_video_affine_transformation_meta_apply_matrix")]
    pub fn apply_matrix(&mut self, matrix: &[[f32; 4]; 4]) {
        unsafe {
            ffi::gst_video_affine_transformation_meta_apply_matrix(
                &mut self.0,
                matrix as *const [[f32; 4]; 4] as *const [f32; 16],
            );
        }
    }
}

unsafe impl MetaAPI for VideoAffineTransformationMeta {
    type GstType = ffi::GstVideoAffineTransformationMeta;

    #[doc(alias = "gst_video_affine_transformation_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_affine_transformation_meta_api_get_type()) }
    }
}

impl fmt::Debug for VideoAffineTransformationMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoAffineTransformationMeta")
            .field("matrix", &self.matrix())
            .finish()
    }
}

#[repr(transparent)]
#[doc(alias = "GstVideoOverlayCompositionMeta")]
pub struct VideoOverlayCompositionMeta(ffi::GstVideoOverlayCompositionMeta);

unsafe impl Send for VideoOverlayCompositionMeta {}
unsafe impl Sync for VideoOverlayCompositionMeta {}

impl VideoOverlayCompositionMeta {
    #[doc(alias = "gst_buffer_add_video_overlay_composition_meta")]
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        overlay: &crate::VideoOverlayComposition,
    ) -> gst::MetaRefMut<'a, Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = ffi::gst_buffer_add_video_overlay_composition_meta(
                buffer.as_mut_ptr(),
                overlay.as_mut_ptr(),
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_overlay")]
    #[inline]
    pub fn overlay(&self) -> &crate::VideoOverlayCompositionRef {
        unsafe { crate::VideoOverlayCompositionRef::from_ptr(self.0.overlay) }
    }

    #[doc(alias = "get_overlay_owned")]
    #[inline]
    pub fn overlay_owned(&self) -> crate::VideoOverlayComposition {
        unsafe { from_glib_none(self.overlay().as_ptr()) }
    }

    #[inline]
    pub fn set_overlay(&mut self, overlay: &crate::VideoOverlayComposition) {
        #![allow(clippy::cast_ptr_alignment)]
        unsafe {
            gst::ffi::gst_mini_object_unref(self.0.overlay as *mut _);
            self.0.overlay =
                gst::ffi::gst_mini_object_ref(overlay.as_mut_ptr() as *mut _) as *mut _;
        }
    }
}

unsafe impl MetaAPI for VideoOverlayCompositionMeta {
    type GstType = ffi::GstVideoOverlayCompositionMeta;

    #[doc(alias = "gst_video_overlay_composition_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_overlay_composition_meta_api_get_type()) }
    }
}

impl fmt::Debug for VideoOverlayCompositionMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoOverlayCompositionMeta")
            .field("overlay", &self.overlay())
            .finish()
    }
}

#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
#[repr(transparent)]
#[doc(alias = "GstVideoCaptionMeta")]
pub struct VideoCaptionMeta(ffi::GstVideoCaptionMeta);

#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
unsafe impl Send for VideoCaptionMeta {}
#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
unsafe impl Sync for VideoCaptionMeta {}

#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
impl VideoCaptionMeta {
    #[doc(alias = "gst_buffer_add_video_caption_meta")]
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        caption_type: crate::VideoCaptionType,
        data: &[u8],
    ) -> gst::MetaRefMut<'a, Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        assert!(!data.is_empty());
        unsafe {
            let meta = ffi::gst_buffer_add_video_caption_meta(
                buffer.as_mut_ptr(),
                caption_type.into_glib(),
                data.as_ptr(),
                data.len(),
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_caption_type")]
    #[inline]
    pub fn caption_type(&self) -> crate::VideoCaptionType {
        unsafe { from_glib(self.0.caption_type) }
    }

    #[doc(alias = "get_data")]
    #[inline]
    pub fn data(&self) -> &[u8] {
        if self.0.size == 0 {
            return &[];
        }
        unsafe {
            use std::slice;

            slice::from_raw_parts(self.0.data, self.0.size)
        }
    }
}

#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
unsafe impl MetaAPI for VideoCaptionMeta {
    type GstType = ffi::GstVideoCaptionMeta;

    #[doc(alias = "gst_video_caption_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_caption_meta_api_get_type()) }
    }
}

#[cfg(feature = "v1_16")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
impl fmt::Debug for VideoCaptionMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoCaptionMeta")
            .field("caption_type", &self.caption_type())
            .field("data", &self.data())
            .finish()
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
#[repr(transparent)]
#[doc(alias = "GstVideoAFDMeta")]
pub struct VideoAFDMeta(ffi::GstVideoAFDMeta);

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl Send for VideoAFDMeta {}
#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl Sync for VideoAFDMeta {}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
impl VideoAFDMeta {
    #[doc(alias = "gst_buffer_add_video_afd_meta")]
    pub fn add(
        buffer: &mut gst::BufferRef,
        field: u8,
        spec: crate::VideoAFDSpec,
        afd: crate::VideoAFDValue,
    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();

        unsafe {
            let meta = ffi::gst_buffer_add_video_afd_meta(
                buffer.as_mut_ptr(),
                field,
                spec.into_glib(),
                afd.into_glib(),
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_field")]
    #[inline]
    pub fn field(&self) -> u8 {
        self.0.field
    }

    #[doc(alias = "get_spec")]
    #[inline]
    pub fn spec(&self) -> crate::VideoAFDSpec {
        unsafe { from_glib(self.0.spec) }
    }

    #[doc(alias = "get_afd")]
    #[inline]
    pub fn afd(&self) -> crate::VideoAFDValue {
        unsafe { from_glib(self.0.afd) }
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl MetaAPI for VideoAFDMeta {
    type GstType = ffi::GstVideoAFDMeta;

    #[doc(alias = "gst_video_afd_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_afd_meta_api_get_type()) }
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
impl fmt::Debug for VideoAFDMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoAFDMeta")
            .field("field", &self.field())
            .field("spec", &self.spec())
            .field("afd", &self.afd())
            .finish()
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
#[repr(transparent)]
#[doc(alias = "GstVideoBarMeta")]
pub struct VideoBarMeta(ffi::GstVideoBarMeta);

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl Send for VideoBarMeta {}
#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl Sync for VideoBarMeta {}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
impl VideoBarMeta {
    #[doc(alias = "gst_buffer_add_video_bar_meta")]
    pub fn add(
        buffer: &mut gst::BufferRef,
        field: u8,
        is_letterbox: bool,
        bar_data1: u32,
        bar_data2: u32,
    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();

        unsafe {
            let meta = ffi::gst_buffer_add_video_bar_meta(
                buffer.as_mut_ptr(),
                field,
                is_letterbox.into_glib(),
                bar_data1,
                bar_data2,
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_field")]
    #[inline]
    pub fn field(&self) -> u8 {
        self.0.field
    }

    #[inline]
    pub fn is_letterbox(&self) -> bool {
        unsafe { from_glib(self.0.is_letterbox) }
    }

    #[doc(alias = "get_bar_data1")]
    #[inline]
    pub fn bar_data1(&self) -> u32 {
        self.0.bar_data1
    }

    #[doc(alias = "get_bar_data2")]
    #[inline]
    pub fn bar_data2(&self) -> u32 {
        self.0.bar_data2
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
unsafe impl MetaAPI for VideoBarMeta {
    type GstType = ffi::GstVideoBarMeta;

    #[doc(alias = "gst_video_bar_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_bar_meta_api_get_type()) }
    }
}

#[cfg(feature = "v1_18")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
impl fmt::Debug for VideoBarMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoBarMeta")
            .field("field", &self.field())
            .field("is_letterbox", &self.is_letterbox())
            .field("bar_data1", &self.bar_data1())
            .field("bar_data2", &self.bar_data2())
            .finish()
    }
}

#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
#[repr(transparent)]
#[doc(alias = "GstVideoCodecAlphaMeta")]
pub struct VideoCodecAlphaMeta(ffi::GstVideoCodecAlphaMeta);

#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
unsafe impl Send for VideoCodecAlphaMeta {}
#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
unsafe impl Sync for VideoCodecAlphaMeta {}

#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
impl VideoCodecAlphaMeta {
    #[doc(alias = "gst_buffer_add_video_codec_alpha_meta")]
    pub fn add(
        buffer: &mut gst::BufferRef,
        alpha_buffer: gst::Buffer,
    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = ffi::gst_buffer_add_video_codec_alpha_meta(
                buffer.as_mut_ptr(),
                alpha_buffer.to_glib_none().0,
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[inline]
    pub fn alpha_buffer(&self) -> &gst::BufferRef {
        unsafe { gst::BufferRef::from_ptr(self.0.buffer) }
    }

    #[inline]
    pub fn alpha_buffer_owned(&self) -> gst::Buffer {
        unsafe { from_glib_none(self.0.buffer) }
    }
}

#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
unsafe impl MetaAPI for VideoCodecAlphaMeta {
    type GstType = ffi::GstVideoCodecAlphaMeta;

    #[doc(alias = "gst_video_codec_alpha_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_video_codec_alpha_meta_api_get_type()) }
    }
}

#[cfg(feature = "v1_20")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
impl fmt::Debug for VideoCodecAlphaMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoCodecAlphaMeta")
            .field("buffer", &self.alpha_buffer())
            .finish()
    }
}

#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
#[repr(transparent)]
#[doc(alias = "GstVideoSEIUserDataUnregisteredMeta")]
pub struct VideoSeiUserDataUnregisteredMeta(ffi::GstVideoSEIUserDataUnregisteredMeta);

#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
unsafe impl Send for VideoSeiUserDataUnregisteredMeta {}
#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
unsafe impl Sync for VideoSeiUserDataUnregisteredMeta {}

#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
impl VideoSeiUserDataUnregisteredMeta {
    #[doc(alias = "gst_buffer_add_video_sei_user_data_unregistered_meta")]
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        uuid: &[u8; 16],
        data: &[u8],
    ) -> gst::MetaRefMut<'a, Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        assert!(!data.is_empty());
        unsafe {
            let meta = ffi::gst_buffer_add_video_sei_user_data_unregistered_meta(
                buffer.as_mut_ptr(),
                mut_override(uuid.as_ptr()),
                mut_override(data.as_ptr()),
                data.len(),
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[doc(alias = "get_data")]
    #[inline]
    pub fn data(&self) -> &[u8] {
        if self.0.size == 0 {
            return &[];
        }
        // SAFETY: In the C API we have a pointer data and a size variable
        // indicating the length of the data. Here we convert it to a size,
        // making sure we read the size specified in the C API.
        unsafe {
            use std::slice;
            slice::from_raw_parts(self.0.data, self.0.size)
        }
    }

    #[doc(alias = "get_uuid")]
    #[inline]
    pub fn uuid(&self) -> [u8; 16] {
        self.0.uuid
    }
}

#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
impl fmt::Debug for VideoSeiUserDataUnregisteredMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("VideoSeiUserDataUnregisteredMeta")
            .field(
                "uuid",
                &format!("0x{:032X}", u128::from_be_bytes(self.uuid())),
            )
            .field("data", &self.data())
            .finish()
    }
}

#[cfg(feature = "v1_22")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
unsafe impl MetaAPI for VideoSeiUserDataUnregisteredMeta {
    type GstType = ffi::GstVideoSEIUserDataUnregisteredMeta;

    #[doc(alias = "gst_video_sei_user_data_unregistered_meta_api_get_type")]
    fn meta_api() -> glib::Type {
        unsafe {
            glib::translate::from_glib(ffi::gst_video_sei_user_data_unregistered_meta_api_get_type())
        }
    }
}

#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
#[repr(transparent)]
#[doc(alias = "GstAncillaryMeta")]
pub struct AncillaryMeta(ffi::GstAncillaryMeta);

#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
unsafe impl Send for AncillaryMeta {}
#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
unsafe impl Sync for AncillaryMeta {}

#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
impl AncillaryMeta {
    #[doc(alias = "gst_buffer_add_ancillary_meta")]
    pub fn add(buffer: &mut gst::BufferRef) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        unsafe {
            let meta = ffi::gst_buffer_add_ancillary_meta(buffer.as_mut_ptr());

            Self::from_mut_ptr(buffer, meta)
        }
    }

    #[inline]
    pub fn field(&self) -> crate::AncillaryMetaField {
        unsafe { from_glib(self.0.field) }
    }

    #[inline]
    pub fn set_field(&mut self, field: crate::AncillaryMetaField) {
        self.0.field = field.into_glib();
    }

    #[inline]
    pub fn c_not_y_channel(&self) -> bool {
        unsafe { from_glib(self.0.c_not_y_channel) }
    }

    #[inline]
    pub fn set_c_not_y_channel(&mut self, c_not_y_channel: bool) {
        self.0.c_not_y_channel = c_not_y_channel.into_glib();
    }

    #[inline]
    pub fn line(&self) -> u16 {
        self.0.line
    }

    #[inline]
    pub fn set_line(&mut self, line: u16) {
        self.0.line = line;
    }

    #[inline]
    pub fn offset(&self) -> u16 {
        self.0.offset
    }

    #[inline]
    pub fn set_offset(&mut self, offset: u16) {
        self.0.offset = offset;
    }

    #[inline]
    pub fn did(&self) -> u16 {
        self.0.DID
    }

    #[inline]
    pub fn set_did(&mut self, did: u16) {
        self.0.DID = did;
    }

    #[inline]
    pub fn sdid_block_number(&self) -> u16 {
        self.0.SDID_block_number
    }

    #[inline]
    pub fn set_sdid_block_number(&mut self, sdid_block_number: u16) {
        self.0.SDID_block_number = sdid_block_number;
    }

    #[inline]
    pub fn data_count(&self) -> u16 {
        self.0.data_count
    }

    #[inline]
    pub fn checksum(&self) -> u16 {
        self.0.checksum
    }

    #[inline]
    pub fn set_checksum(&mut self, checksum: u16) {
        self.0.checksum = checksum;
    }

    #[inline]
    pub fn data(&self) -> &[u16] {
        if self.0.data_count & 0xff == 0 {
            return &[];
        }
        unsafe {
            use std::slice;

            slice::from_raw_parts(self.0.data, (self.0.data_count & 0xff) as usize)
        }
    }

    #[inline]
    pub fn data_mut(&mut self) -> &mut [u16] {
        if self.0.data_count & 0xff == 0 {
            return &mut [];
        }
        unsafe {
            use std::slice;

            slice::from_raw_parts_mut(self.0.data, (self.0.data_count & 0xff) as usize)
        }
    }

    #[inline]
    pub fn set_data(&mut self, data: glib::Slice<u16>) {
        unsafe {
            assert!(data.len() < 256);
            self.0.data_count = data.len() as u16;
            self.0.data = data.into_glib_ptr();
        }
    }

    #[inline]
    pub fn set_data_count_upper_two_bits(&mut self, upper_two_bits: u8) {
        assert!(upper_two_bits & !0x03 == 0);
        self.0.data_count = ((upper_two_bits as u16) << 8) | self.0.data_count & 0xff;
    }
}

#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
unsafe impl MetaAPI for AncillaryMeta {
    type GstType = ffi::GstAncillaryMeta;

    #[doc(alias = "gst_ancillary_meta_api_get_type")]
    #[inline]
    fn meta_api() -> glib::Type {
        unsafe { from_glib(ffi::gst_ancillary_meta_api_get_type()) }
    }
}

#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
impl fmt::Debug for AncillaryMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("AncillaryMeta")
            .field("field", &self.field())
            .field("c_not_y_channel", &self.c_not_y_channel())
            .field("line", &self.line())
            .field("offset", &self.offset())
            .field("did", &self.did())
            .field("sdid_block_number", &self.sdid_block_number())
            .field("data_count", &self.data_count())
            .field("data", &self.data())
            .field("checksum", &self.checksum())
            .finish()
    }
}

pub mod tags {
    gst::impl_meta_tag!(Video, crate::ffi::GST_META_TAG_VIDEO_STR);
    gst::impl_meta_tag!(Size, crate::ffi::GST_META_TAG_VIDEO_SIZE_STR);
    gst::impl_meta_tag!(Orientation, crate::ffi::GST_META_TAG_VIDEO_ORIENTATION_STR);
    gst::impl_meta_tag!(Colorspace, crate::ffi::GST_META_TAG_VIDEO_COLORSPACE_STR);
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct VideoMetaTransformScale<'a> {
    in_info: &'a crate::VideoInfo,
    out_info: &'a crate::VideoInfo,
}

impl<'a> VideoMetaTransformScale<'a> {
    pub fn new(in_info: &'a crate::VideoInfo, out_info: &'a crate::VideoInfo) -> Self {
        skip_assert_initialized!();
        VideoMetaTransformScale { in_info, out_info }
    }
}

unsafe impl<'a> gst::meta::MetaTransform<'a> for VideoMetaTransformScale<'a> {
    type GLibType = ffi::GstVideoMetaTransform;

    #[doc(alias = "gst_video_meta_transform_scale_get_quark")]
    fn quark() -> glib::Quark {
        unsafe { from_glib(ffi::gst_video_meta_transform_scale_get_quark()) }
    }

    fn to_raw<T: MetaAPI>(
        &self,
        _meta: &gst::MetaRef<T>,
    ) -> Result<ffi::GstVideoMetaTransform, glib::BoolError> {
        Ok(ffi::GstVideoMetaTransform {
            in_info: mut_override(self.in_info.to_glib_none().0),
            out_info: mut_override(self.out_info.to_glib_none().0),
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add_get_meta() {
        gst::init().unwrap();

        let mut buffer = gst::Buffer::with_size(320 * 240 * 4).unwrap();
        {
            let meta = VideoMeta::add(
                buffer.get_mut().unwrap(),
                crate::VideoFrameFlags::empty(),
                crate::VideoFormat::Argb,
                320,
                240,
            )
            .unwrap();
            assert_eq!(meta.id(), 0);
            assert_eq!(meta.video_frame_flags(), crate::VideoFrameFlags::empty());
            assert_eq!(meta.format(), crate::VideoFormat::Argb);
            assert_eq!(meta.width(), 320);
            assert_eq!(meta.height(), 240);
            assert_eq!(meta.n_planes(), 1);
            assert_eq!(meta.offset(), &[0]);
            assert_eq!(meta.stride(), &[320 * 4]);
            assert!(meta.has_tag::<gst::meta::tags::Memory>());
            assert!(meta.has_tag::<tags::Video>());
            assert!(meta.has_tag::<tags::Colorspace>());
            assert!(meta.has_tag::<tags::Size>());
        }

        {
            let meta = buffer.meta::<VideoMeta>().unwrap();
            assert_eq!(meta.id(), 0);
            assert_eq!(meta.video_frame_flags(), crate::VideoFrameFlags::empty());
            assert_eq!(meta.format(), crate::VideoFormat::Argb);
            assert_eq!(meta.width(), 320);
            assert_eq!(meta.height(), 240);
            assert_eq!(meta.n_planes(), 1);
            assert_eq!(meta.offset(), &[0]);
            assert_eq!(meta.stride(), &[320 * 4]);
        }
    }

    #[test]
    fn test_add_full_get_meta() {
        gst::init().unwrap();

        let mut buffer = gst::Buffer::with_size(320 * 240 * 4).unwrap();
        {
            let meta = VideoMeta::add_full(
                buffer.get_mut().unwrap(),
                crate::VideoFrameFlags::empty(),
                crate::VideoFormat::Argb,
                320,
                240,
                &[0],
                &[320 * 4],
            )
            .unwrap();
            assert_eq!(meta.id(), 0);
            assert_eq!(meta.video_frame_flags(), crate::VideoFrameFlags::empty());
            assert_eq!(meta.format(), crate::VideoFormat::Argb);
            assert_eq!(meta.width(), 320);
            assert_eq!(meta.height(), 240);
            assert_eq!(meta.n_planes(), 1);
            assert_eq!(meta.offset(), &[0]);
            assert_eq!(meta.stride(), &[320 * 4]);
        }

        {
            let meta = buffer.meta::<VideoMeta>().unwrap();
            assert_eq!(meta.id(), 0);
            assert_eq!(meta.video_frame_flags(), crate::VideoFrameFlags::empty());
            assert_eq!(meta.format(), crate::VideoFormat::Argb);
            assert_eq!(meta.width(), 320);
            assert_eq!(meta.height(), 240);
            assert_eq!(meta.n_planes(), 1);
            assert_eq!(meta.offset(), &[0]);
            assert_eq!(meta.stride(), &[320 * 4]);
        }
    }

    #[test]
    #[cfg(feature = "v1_18")]
    fn test_video_meta_alignment() {
        gst::init().unwrap();

        let mut buffer = gst::Buffer::with_size(115200).unwrap();
        let meta = VideoMeta::add(
            buffer.get_mut().unwrap(),
            crate::VideoFrameFlags::empty(),
            crate::VideoFormat::Nv12,
            320,
            240,
        )
        .unwrap();

        let alig = meta.alignment();
        assert_eq!(alig, crate::VideoAlignment::new(0, 0, 0, 0, &[0, 0, 0, 0]));

        assert_eq!(meta.plane_size().unwrap(), [76800, 38400, 0, 0]);
        assert_eq!(meta.plane_height().unwrap(), [240, 120, 0, 0]);

        /* horizontal padding */
        let mut info = crate::VideoInfo::builder(crate::VideoFormat::Nv12, 320, 240)
            .build()
            .expect("Failed to create VideoInfo");
        let mut alig = crate::VideoAlignment::new(0, 0, 2, 6, &[0, 0, 0, 0]);
        info.align(&mut alig).unwrap();

        let mut meta = VideoMeta::add_full(
            buffer.get_mut().unwrap(),
            crate::VideoFrameFlags::empty(),
            crate::VideoFormat::Nv12,
            info.width(),
            info.height(),
            info.offset(),
            info.stride(),
        )
        .unwrap();
        meta.set_alignment(&alig).unwrap();

        let alig = meta.alignment();
        assert_eq!(alig, crate::VideoAlignment::new(0, 0, 2, 6, &[0, 0, 0, 0]));

        assert_eq!(meta.plane_size().unwrap(), [78720, 39360, 0, 0]);
        assert_eq!(meta.plane_height().unwrap(), [240, 120, 0, 0]);

        /* vertical alignment */
        let mut info = crate::VideoInfo::builder(crate::VideoFormat::Nv12, 320, 240)
            .build()
            .expect("Failed to create VideoInfo");
        let mut alig = crate::VideoAlignment::new(2, 6, 0, 0, &[0, 0, 0, 0]);
        info.align(&mut alig).unwrap();

        let mut meta = VideoMeta::add_full(
            buffer.get_mut().unwrap(),
            crate::VideoFrameFlags::empty(),
            crate::VideoFormat::Nv12,
            info.width(),
            info.height(),
            info.offset(),
            info.stride(),
        )
        .unwrap();
        meta.set_alignment(&alig).unwrap();

        let alig = meta.alignment();
        assert_eq!(alig, crate::VideoAlignment::new(2, 6, 0, 0, &[0, 0, 0, 0]));

        assert_eq!(meta.plane_size().unwrap(), [79360, 39680, 0, 0]);
        assert_eq!(meta.plane_height().unwrap(), [248, 124, 0, 0]);
    }

    #[test]
    #[cfg(feature = "v1_22")]
    fn test_get_video_sei_user_data_unregistered_meta() {
        gst::init().unwrap();

        const META_UUID: &[u8; 16] = &[
            0x4D, 0x49, 0x53, 0x50, 0x6D, 0x69, 0x63, 0x72, 0x6F, 0x73, 0x65, 0x63, 0x74, 0x69,
            0x6D, 0x65,
        ];

        const META_DATA: &[u8] = &[
            0x1f, 0x00, 0x05, 0xff, 0x21, 0x7e, 0xff, 0x29, 0xb5, 0xff, 0xdc, 0x13,
        ];

        let buffer_data = &[
            &[0x00, 0x00, 0x00, 0x20, 0x06, 0x05, 0x1c],
            META_UUID as &[u8],
            META_DATA,
            &[
                0x80, 0x00, 0x00, 0x00, 0x14, 0x65, 0x88, 0x84, 0x00, 0x10, 0xff, 0xfe, 0xf6, 0xf0,
                0xfe, 0x05, 0x36, 0x56, 0x04, 0x50, 0x96, 0x7b, 0x3f, 0x53, 0xe1,
            ],
        ]
        .concat();

        let mut harness = gst_check::Harness::new("h264parse");
        harness.set_src_caps_str(r#"
            video/x-h264, stream-format=(string)avc,
            width=(int)1920, height=(int)1080, framerate=(fraction)25/1,
            bit-depth-chroma=(uint)8, parsed=(boolean)true,
            alignment=(string)au, profile=(string)high, level=(string)4,
            codec_data=(buffer)01640028ffe1001a67640028acb200f0044fcb080000030008000003019478c1924001000568ebccb22c
        "#);
        let buffer = gst::Buffer::from_slice(buffer_data.clone());
        let buffer = harness.push_and_pull(buffer).unwrap();

        let meta = buffer.meta::<VideoSeiUserDataUnregisteredMeta>().unwrap();
        assert_eq!(meta.uuid(), *META_UUID);
        assert_eq!(meta.data(), META_DATA);
        assert_eq!(meta.data().len(), META_DATA.len());
    }

    #[test]
    fn test_meta_video_transform() {
        gst::init().unwrap();

        let mut buffer = gst::Buffer::with_size(320 * 240 * 4).unwrap();
        let meta = VideoCropMeta::add(buffer.get_mut().unwrap(), (10, 10, 20, 20));

        let mut buffer2 = gst::Buffer::with_size(640 * 480 * 4).unwrap();

        let in_video_info = crate::VideoInfo::builder(crate::VideoFormat::Rgba, 320, 240)
            .build()
            .unwrap();
        let out_video_info = crate::VideoInfo::builder(crate::VideoFormat::Rgba, 640, 480)
            .build()
            .unwrap();

        meta.transform(
            buffer2.get_mut().unwrap(),
            &VideoMetaTransformScale::new(&in_video_info, &out_video_info),
        )
        .unwrap();

        let meta2 = buffer2.meta::<VideoCropMeta>().unwrap();

        assert_eq!(meta2.rect(), (20, 20, 40, 40));
    }
}