MediaCodecInfo: allow getting info for secure codec

3 minor fixes:
- return correct codec's info from MediaCodec.getCodecInfo()
- treat required features supported
- make feature spec optional in isFormatSupported

Bug: 17154761
Change-Id: Ie98af35ec16caf48a76358fe178f9cc243abad4f

media/java/android/media/MediaCodec.java

@@ -1619,8 +1619,7 @@ final public class MediaCodec {
      * @throws IllegalStateException if in the Uninitialized state.
      */
     public MediaCodecInfo getCodecInfo() {
-        return MediaCodecList.getCodecInfoAt(
-                   MediaCodecList.findCodecByName(getName()));
+        return MediaCodecList.getInfoFor(getName());
     }
 
     private native final ByteBuffer[] getBuffers(boolean input);

media/java/android/media/MediaCodecInfo.java

@@ -321,6 +321,9 @@ public final class MediaCodecInfo {
             // check feature support
             for (Feature feat: getValidFeatures()) {
                 Integer yesNo = (Integer)map.get(MediaFormat.KEY_FEATURE_ + feat.mName);
+                if (yesNo == null) {
+                    continue;
+                }
                 if ((yesNo == 1 && !isFeatureSupported(feat.mName)) ||
                         (yesNo == 0 && isFeatureRequired(feat.mName))) {
                     return false;
@@ -470,13 +473,12 @@ public final class MediaCodecInfo {
                 Integer yesNo = (Integer)map.get(key);
                 if (yesNo == null) {
                     continue;
-                } else if (yesNo > 0) {
-                    mFlagsRequired |= feat.mValue;
-                    mDefaultFormat.setInteger(key, 1);
-                } else {
-                    mFlagsSupported |= feat.mValue;
-                    mDefaultFormat.setInteger(key, 1);
                 }
+                if (yesNo > 0) {
+                    mFlagsRequired |= feat.mValue;
+                }
+                mFlagsSupported |= feat.mValue;
+                mDefaultFormat.setInteger(key, 1);
                 // TODO restrict features by mFlagsVerified once all codecs reliably verify them
             }
         }

media/java/android/media/MediaCodecList.java

@@ -116,6 +116,11 @@ final public class MediaCodecList {
 
     /* package private */ static native final int findCodecByName(String codec);
 
+    /** @hide */
+    public static MediaCodecInfo getInfoFor(String codec) {
+        return sAllCodecInfos[findCodecByName(codec)];
+    }
+
     private static native final void native_init();
 
     /**