crate: add image support

Cargo.toml

@@ -26,6 +26,10 @@ software-scaling    = ["ffmpeg-sys/swscale", "codec"]
 libc     = "0.1"
 bitflags = "0.1"
 
+[dependencies.image]
+version  = "*"
+optional = true
+
 [dependencies.ffmpeg-sys]
 version = "2.7.0"
 

src/lib.rs

@@ -3,6 +3,7 @@
 extern crate libc;
 extern crate ffmpeg_sys as ffi;
 #[macro_use] extern crate bitflags;
+#[cfg(feature = "image")] extern crate image;
 
 pub mod util;
 pub use util::error::Error;

src/util/frame/video.rs

@@ -293,3 +293,24 @@ impl Clone for Video {
 pub trait Component {
 	fn is_valid(format: format::Pixel) -> bool;
 }
+
+#[cfg(feature = "image")]
+impl Component for ::image::Luma<u8> {
+	fn is_valid(format: format::Pixel) -> bool {
+		format == format::Pixel::GRAY8
+	}
+}
+
+#[cfg(feature = "image")]
+impl Component for ::image::Rgb<u8> {
+	fn is_valid(format: format::Pixel) -> bool {
+		format == format::Pixel::RGB24
+	}
+}
+
+#[cfg(feature = "image")]
+impl Component for ::image::Rgba<u8> {
+	fn is_valid(format: format::Pixel) -> bool {
+		format == format::Pixel::RGBA
+	}
+}