cargo: add features

src/device/extensions.rs

@@ -0,0 +1,67 @@
+use std::ptr;
+use std::marker::PhantomData;
+
+use ffi::*;
+use ::Error;
+use ::format::Context;
+use ::device;
+use libc::c_int;
+
+impl Context {
+	pub fn devices(&self) -> Result<DeviceIter, Error> {
+		DeviceIter::new(self.ptr)
+	}
+}
+
+pub struct DeviceIter<'a> {
+	ptr: *mut AVDeviceInfoList,
+	cur: c_int,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> DeviceIter<'a> {
+	pub fn new(ctx: *mut AVFormatContext) -> Result<Self, Error> {
+		unsafe {
+			let mut ptr: *mut AVDeviceInfoList = ptr::null_mut();
+
+			match avdevice_list_devices(ctx, &mut ptr) {
+				n if n < 0 =>
+					Err(Error::new(n)),
+
+				_ =>
+					Ok(DeviceIter { ptr: ptr, cur: 0, _marker: PhantomData })
+			}
+		}
+	}
+
+	pub fn default(&self) -> usize {
+		unsafe {
+			(*self.ptr).default_device as usize
+		}
+	}
+}
+
+impl<'a> Drop for DeviceIter<'a> {
+	fn drop(&mut self) {
+		unsafe {
+			avdevice_free_list_devices(&mut self.ptr);
+		}
+	}
+}
+
+impl<'a> Iterator for DeviceIter<'a> {
+	type Item = device::Info<'a>;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if self.cur >= (*self.ptr).nb_devices {
+				None
+			}
+			else {
+				self.cur += 1;
+				Some(device::Info::wrap(*(*self.ptr).devices.offset((self.cur - 1) as isize)))
+			}
+		}
+	}
+}

src/device/mod.rs

@@ -1,5 +1,6 @@
 pub mod input;
 pub mod output;
+pub mod extensions;
 
 use std::ffi::CStr;
 use std::str::from_utf8_unchecked;