Feature/keyframe interval (#118)

* Add keyframe interval transformation parameter

Author: nitzanj

cloudinary-core/src/main/java/com/cloudinary/Transformation.java

@@ -121,6 +121,24 @@ public T gravity(String value) {
         return param("gravity", value);
     }
 
+    /**
+     * Set the keyframe interval parameter
+     * @param value Interval in seconds
+     * @return The transformation for chaining
+     */
+    public T keyframeInterval(float value) {
+        return param("keyframe_interval", value);
+    }
+
+    /**
+     * Set the keyframe interval parameter
+     * @param value Interval in seconds.
+     * @return The transformation for chaining
+     */
+    public T keyframeInterval(String value) {
+        return param("keyframe_interval", value);
+    }
+
     public T colorSpace(String value) {
         return param("color_space", value);
     }
@@ -623,7 +641,8 @@ public String generate(Map options) {
                 "pg", "page",
                 "u", "underlay",
                 "vs", "video_sampling",
-                "sp", "streaming_profile"
+                "sp", "streaming_profile",
+                "ki", "keyframe_interval"
                 };
 
         for (int i = 0; i < simple_params.length; i += 2) {

cloudinary-core/src/test/java/com/cloudinary/test/CloudinaryTest.java

@@ -1084,6 +1084,17 @@ public void testFps() {
 
     }
 
+    @Test
+    public void testKeyframeInterval(){
+        assertEquals("ki_10.0", new Transformation().keyframeInterval(10).generate());
+        assertEquals("ki_0.05", new Transformation().keyframeInterval(0.05f).generate());
+        assertEquals("ki_3.45", new Transformation().keyframeInterval(3.45f).generate());
+        assertEquals("ki_300.0", new Transformation().keyframeInterval(300).generate());
+        assertEquals("ki_10", new Transformation().keyframeInterval("10").generate());
+        assertEquals("", new Transformation().keyframeInterval("").generate());
+        assertEquals("", new Transformation().keyframeInterval(null).generate());
+    }
+
     public static Map<String, String> getUrlParameters(URI uri) throws UnsupportedEncodingException {
         Map<String, String> params = new HashMap<String, String>();
         for (String param : uri.getRawQuery().split("&")) {