util/frame: add some more accessors

src/util/chroma/location.rs

@@ -0,0 +1,41 @@
+use ffi::*;
+
+#[derive(Eq, PartialEq, Clone, Copy, Debug)]
+pub enum Location {
+	Unspecified,
+	Left,
+	Center,
+	TopLeft,
+	Top,
+	BottomLeft,
+	Bottom,
+}
+
+impl From<AVChromaLocation> for Location {
+	fn from(value: AVChromaLocation) -> Self {
+		match value {
+			AVCHROMA_LOC_UNSPECIFIED => Location::Unspecified,
+			AVCHROMA_LOC_LEFT        => Location::Left,
+			AVCHROMA_LOC_CENTER      => Location::Center,
+			AVCHROMA_LOC_TOPLEFT     => Location::TopLeft,
+			AVCHROMA_LOC_TOP         => Location::Top,
+			AVCHROMA_LOC_BOTTOMLEFT  => Location::BottomLeft,
+			AVCHROMA_LOC_BOTTOM      => Location::Bottom,
+			AVCHROMA_LOC_NB          => Location::Unspecified
+		}
+	}
+}
+
+impl Into<AVChromaLocation> for Location {
+	fn into(self) -> AVChromaLocation {
+		match self {
+			Location::Unspecified => AVCHROMA_LOC_UNSPECIFIED,
+			Location::Left        => AVCHROMA_LOC_LEFT,
+			Location::Center      => AVCHROMA_LOC_CENTER,
+			Location::TopLeft     => AVCHROMA_LOC_TOPLEFT,
+			Location::Top         => AVCHROMA_LOC_TOP,
+			Location::BottomLeft  => AVCHROMA_LOC_BOTTOMLEFT,
+			Location::Bottom      => AVCHROMA_LOC_BOTTOM
+		}
+	}
+}

src/util/chroma/mod.rs

@@ -0,0 +1,2 @@
+pub mod location;
+pub use self::location::Location;

src/util/frame/mod.rs

@@ -7,8 +7,9 @@ use std::mem;
 use std::ops::Deref;
 
 use ffi::*;
-use ::{Dictionary, Rational};
+use ::{Dictionary, Rational, Picture};
 use ::util::format;
+use ::util::chroma;
 use ::picture;
 use ::color;
 
@@ -257,6 +258,10 @@ impl Video {
 		Video(Frame::new())
 	}
 
+	pub fn picture(&self) -> Picture {
+		Picture::wrap(self.ptr as *mut AVPicture, self.format(), self.width(), self.height())
+	}
+
 	pub fn format(&self) -> format::Pixel {
 		unsafe {
 			if (*self.ptr).format == -1 {
@@ -274,6 +279,24 @@ impl Video {
 		}
 	}
 
+	pub fn is_interlaced(&self) -> bool {
+		unsafe {
+			(*self.ptr).interlaced_frame != 0
+		}
+	}
+
+	pub fn is_top_first(&self) -> bool {
+		unsafe {
+			(*self.ptr).top_field_first != 0
+		}
+	}
+
+	pub fn has_palette_changed(&self) -> bool {
+		unsafe {
+			(*self.ptr).palette_has_changed != 0
+		}
+	}
+
 	pub fn width(&self) -> usize {
 		unsafe {
 			(*self.ptr).width as usize
@@ -346,6 +369,11 @@ impl Video {
 		}
 	}
 
+	pub fn chroma_location(&self) -> chroma::Location {
+		unsafe {
+			chroma::Location::from((*self.ptr).chroma_location)
+		}
+	}
 
 	pub fn aspect_ratio(&self) -> Rational {
 		unsafe {

src/util/mod.rs

@@ -6,6 +6,7 @@ pub mod picture;
 pub mod color;
 pub mod format;
 pub mod frame;
+pub mod chroma;
 
 use std::ffi::CStr;
 use std::str::from_utf8_unchecked;