Support Android API 19

Since "adb forward" fallback has been implemented, it is easy to support API 19. Replace the incompatible calls related to MediaCodec to use minSdkVersion 19 instead of 21.
Genymobile · Mar 28, 2018 · 1de8506 · 1de8506
1 parent 71f50fb
commit 1de8506
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Showing 3 changed files with 17 additions and 3 deletions.
diff --git a/README.md b/README.md
@@ -9,7 +9,7 @@ and _MacOS_.
 
 ## Requirements
 
-The Android part requires at least API 21 (Android 5.0).
+The Android part requires at least API 19 (Android 4.4).
 
 You need [adb]. It is available in the [Android SDK platform
 tools][platform-tools], or packaged in your distribution (`android-adb-tools`).

diff --git a/server/build.gradle b/server/build.gradle
@@ -4,7 +4,7 @@ android {
     compileSdkVersion 27
     defaultConfig {
         applicationId "com.genymobile.scrcpy"
-        minSdkVersion 21
+        minSdkVersion 19
         targetSdkVersion 27
         versionCode 2
         versionName "1.1"

diff --git a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
@@ -6,6 +6,7 @@
 import android.media.MediaCodec;
 import android.media.MediaCodecInfo;
 import android.media.MediaFormat;
+import android.os.Build;
 import android.os.IBinder;
 import android.view.Surface;
 
@@ -77,11 +78,17 @@ public void streamScreen(Device device, OutputStream outputStream) throws IOExce
         }
     }
 
+    @SuppressWarnings("deprecation") // Android API 19 requires to call deprecated methods
     private boolean encode(MediaCodec codec, OutputStream outputStream) throws IOException {
         @SuppressWarnings("checkstyle:MagicNumber")
         byte[] buf = new byte[bitRate / 8]; // may contain up to 1 second of video
         boolean eof = false;
         MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
+
+        ByteBuffer[] outputBuffers = null;
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            outputBuffers = codec.getOutputBuffers();
+        }
         while (!consumeRotationChange() && !eof) {
             int outputBufferId = codec.dequeueOutputBuffer(bufferInfo, -1);
             eof = (bufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0;
@@ -91,7 +98,12 @@ private boolean encode(MediaCodec codec, OutputStream outputStream) throws IOExc
                     break;
                 }
                 if (outputBufferId >= 0) {
-                    ByteBuffer outputBuffer = codec.getOutputBuffer(outputBufferId);
+                    ByteBuffer outputBuffer;
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                        outputBuffer = codec.getOutputBuffer(outputBufferId);
+                    } else {
+                        outputBuffer = outputBuffers[outputBufferId];
+                    }
                     while (outputBuffer.hasRemaining()) {
                         int remaining = outputBuffer.remaining();
                         int len = Math.min(buf.length, remaining);
@@ -100,6 +112,8 @@ private boolean encode(MediaCodec codec, OutputStream outputStream) throws IOExc
                         outputBuffer.get(buf, 0, len);
                         outputStream.write(buf, 0, len);
                     }
+                } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP && outputBufferId == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
+                    outputBuffers = codec.getOutputBuffers();
                 }
             } finally {
                 if (outputBufferId >= 0) {