From 953ba1021f9e1112d694224fd6cc5688eeecb770 Mon Sep 17 00:00:00 2001
From: Eugen Pechanec <e.pechanec@gmail.com>
Date: Sat, 25 Jun 2022 13:27:03 +0200
Subject: [PATCH] Extract MediaCodecListCompat from ScreenEncoder

---
 .../scrcpy/MediaCodecListCompat.java          | 73 +++++++++++++++++++
 .../com/genymobile/scrcpy/ScreenEncoder.java  | 18 +----
 2 files changed, 74 insertions(+), 17 deletions(-)
 create mode 100644 server/src/main/java/com/genymobile/scrcpy/MediaCodecListCompat.java

diff --git a/server/src/main/java/com/genymobile/scrcpy/MediaCodecListCompat.java b/server/src/main/java/com/genymobile/scrcpy/MediaCodecListCompat.java
new file mode 100644
index 00000000..1b5e50eb
--- /dev/null
+++ b/server/src/main/java/com/genymobile/scrcpy/MediaCodecListCompat.java
@@ -0,0 +1,73 @@
+package com.genymobile.scrcpy;
+
+import android.media.MediaCodecInfo;
+import android.media.MediaCodecList;
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+
+import java.util.Arrays;
+
+import static android.media.MediaCodecList.REGULAR_CODECS;
+import static android.os.Build.VERSION.SDK_INT;
+
+/**
+ * Version of {@link MediaCodecList} that backports {@link #getCodecInfos()} to Kitkat.
+ */
+abstract class MediaCodecListCompat {
+    MediaCodecListCompat() {
+    }
+
+    /**
+     * Returns the list of codecs that are suitable
+     * for regular (buffer-to-buffer) decoding or encoding.
+     */
+    static MediaCodecListCompat regular() {
+        if (SDK_INT >= 21) {
+            return new Platform();
+        } else {
+            return new Backport();
+        }
+    }
+
+    /**
+     * Returns the list of {@link MediaCodecInfo} objects for the list
+     * of media-codecs.
+     */
+    @NonNull
+    abstract MediaCodecInfo[] getCodecInfos();
+
+    @SuppressWarnings("deprecation")
+    private static class Backport extends MediaCodecListCompat {
+        private final MediaCodecInfo[] mCodecInfos;
+
+        Backport() {
+            final int size = MediaCodecList.getCodecCount();
+            final MediaCodecInfo[] codecInfos = new MediaCodecInfo[size];
+            for (int i = 0; i < size; i++) {
+                codecInfos[i] = MediaCodecList.getCodecInfoAt(i);
+            }
+            this.mCodecInfos = codecInfos;
+        }
+
+        @NonNull
+        @Override
+        public final MediaCodecInfo[] getCodecInfos() {
+            return Arrays.copyOf(mCodecInfos, mCodecInfos.length);
+        }
+    }
+
+    @RequiresApi(21)
+    private static class Platform extends MediaCodecListCompat {
+        private final MediaCodecList mDelegate;
+
+        Platform() {
+            this.mDelegate = new MediaCodecList(REGULAR_CODECS);
+        }
+
+        @NonNull
+        @Override
+        MediaCodecInfo[] getCodecInfos() {
+            return mDelegate.getCodecInfos();
+        }
+    }
+}
diff --git a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
index ccdf0d1b..8381edc2 100644
--- a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
+++ b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
@@ -5,7 +5,6 @@ import com.genymobile.scrcpy.wrappers.SurfaceControl;
 import android.graphics.Rect;
 import android.media.MediaCodec;
 import android.media.MediaCodecInfo;
-import android.media.MediaCodecList;
 import android.media.MediaFormat;
 import android.os.Build;
 import android.os.IBinder;
@@ -202,24 +201,9 @@ public class ScreenEncoder implements Device.RotationListener {
         IO.writeFully(fd, headerBuffer);
     }
 
-    @SuppressWarnings("deprecation") // Android API 19 requires to call deprecated methods
-    private static MediaCodecInfo[] getCodecInfosCompat() {
-        if (Build.VERSION.SDK_INT >= 21) {
-            MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
-            return list.getCodecInfos();
-        } else {
-            final int size = MediaCodecList.getCodecCount();
-            final MediaCodecInfo[] infos = new MediaCodecInfo[size];
-            for (int i = 0; i < size; i++) {
-                infos[i] = MediaCodecList.getCodecInfoAt(i);
-            }
-            return infos;
-        }
-    }
-
     private static MediaCodecInfo[] listEncoders() {
         List<MediaCodecInfo> result = new ArrayList<>();
-        MediaCodecInfo[] codecInfos = getCodecInfosCompat();
+        MediaCodecInfo[] codecInfos = MediaCodecListCompat.regular().getCodecInfos();
         for (MediaCodecInfo codecInfo : codecInfos) {
             if (codecInfo.isEncoder() && Arrays.asList(codecInfo.getSupportedTypes()).contains(MediaFormat.MIMETYPE_VIDEO_AVC)) {
                 result.add(codecInfo);