Fix build with --all-features and run it on travis

.travis.yml

@@ -22,7 +22,8 @@ script:
     - rustc --version
     - cargo build --all
     - cargo test --all
-    - cd examples && cargo build --features=gst-player
+    - cargo build --all --all-features
+    - cargo test --all --all-features
 
 before_install:
 - curl -L https://people.freedesktop.org/~slomo/gstreamer.tar.gz | tar xz

gstreamer-audio/Cargo.toml

@@ -26,8 +26,8 @@ version = "0.1"
 optional = true
 
 [features]
-v1_10 = ["gstreamer-sys/v1_10"]
-v1_12 = ["gstreamer-sys/v1_12", "v1_10"]
+v1_10 = ["gstreamer-sys/v1_10", "gstreamer-audio-sys/v1_10"]
+v1_12 = ["gstreamer-sys/v1_12", "gstreamer-audio-sys/v1_12", "v1_10"]
 embed-lgpl-docs = ["rustdoc-stripper"]
 purge-lgpl-docs = ["rustdoc-stripper"]
 default-features = []

gstreamer-video/Cargo.toml

@@ -25,8 +25,8 @@ version = "0.1"
 optional = true
 
 [features]
-v1_10 = ["gstreamer-sys/v1_10"]
-v1_12 = ["gstreamer-sys/v1_12", "v1_10"]
+v1_10 = ["gstreamer-sys/v1_10", "gstreamer-video-sys/v1_10"]
+v1_12 = ["gstreamer-sys/v1_12", "gstreamer-video-sys/v1_12", "v1_10"]
 embed-lgpl-docs = ["rustdoc-stripper"]
 purge-lgpl-docs = ["rustdoc-stripper"]
 default-features = []

gstreamer-video/src/video_info.rs

@@ -664,7 +664,7 @@ impl ::VideoFieldOrder {
         unsafe { from_glib_full(ffi::gst_video_field_order_to_string(self.to_glib())) }
     }
 
-    pub fn from_string(s: &str) -> Option<Self> {
+    pub fn from_string(s: &str) -> Self {
         unsafe { from_glib(ffi::gst_video_field_order_from_string(s.to_glib_none().0)) }
     }
 }
@@ -674,7 +674,7 @@ impl str::FromStr for ::VideoFieldOrder {
     type Err = ();
 
     fn from_str(s: &str) -> Result<Self, ()> {
-        Self::from_string(s).ok_or(())
+        Ok(Self::from_string(s))
     }
 }