device: add handling

src/device/output.rs

@@ -0,0 +1,51 @@
+use std::ptr;
+
+use ffi::*;
+use ::format;
+use ::Format;
+
+pub struct AudioIter(*mut AVOutputFormat);
+
+impl Iterator for AudioIter {
+	type Item = Format;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			let ptr = av_output_audio_device_next(self.0);
+
+			if ptr == ptr::null_mut() && self.0 != ptr::null_mut() {
+				None
+			}
+			else {
+				Some(Format::Output(format::Output::wrap(ptr)))
+			}
+		}
+	}
+}
+
+pub fn audio() -> AudioIter {
+	AudioIter(ptr::null_mut())
+}
+
+pub struct VideoIter(*mut AVOutputFormat);
+
+impl Iterator for VideoIter {
+	type Item = Format;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			let ptr = av_output_video_device_next(self.0);
+
+			if ptr == ptr::null_mut() && self.0 != ptr::null_mut() {
+				None
+			}
+			else {
+				Some(Format::Output(format::Output::wrap(ptr)))
+			}
+		}
+	}
+}
+
+pub fn video() -> VideoIter {
+	VideoIter(ptr::null_mut())
+}