Extract unknown encoder error message

This will allow to reuse the same code for audio encoder selection.

PR #3757 <Genymobile/scrcpy#3757>

Author: rom1v

server/src/main/java/com/genymobile/scrcpy/CodecUtils.java

@@ -25,4 +25,29 @@ public static void setCodecOption(MediaFormat format, String key, Object value)
             format.setString(key, (String) value);
         }
     }
+
+    public static String buildUnknownEncoderMessage(Codec codec, String encoderName) {
+        StringBuilder msg = new StringBuilder("Encoder '").append(encoderName).append("' for ").append(codec.getName()).append(" not found");
+        MediaCodecInfo[] encoders = listEncoders(codec.getMimeType());
+        if (encoders != null && encoders.length > 0) {
+            msg.append("\nTry to use one of the available encoders:");
+            String codecOption = codec.getType() == Codec.Type.VIDEO ? "video-codec" : "audio-codec";
+            for (MediaCodecInfo encoder : encoders) {
+                msg.append("\n    scrcpy --").append(codecOption).append("=").append(codec.getName());
+                msg.append(" --encoder='").append(encoder.getName()).append("'");
+            }
+        }
+        return msg.toString();
+    }
+
+    private static MediaCodecInfo[] listEncoders(String mimeType) {
+        List<MediaCodecInfo> result = new ArrayList<>();
+        MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
+        for (MediaCodecInfo codecInfo : list.getCodecInfos()) {
+            if (codecInfo.isEncoder() && Arrays.asList(codecInfo.getSupportedTypes()).contains(mimeType)) {
+                result.add(codecInfo);
+            }
+        }
+        return result.toArray(new MediaCodecInfo[result.size()]);
+    }
 }

server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java

@@ -5,7 +5,6 @@
 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;
@@ -14,8 +13,6 @@
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -199,24 +196,13 @@ private boolean encode(MediaCodec codec, Streamer streamer) throws IOException {
         return !eof;
     }
 
-    private static MediaCodecInfo[] listEncoders(String videoMimeType) {
-        List<MediaCodecInfo> result = new ArrayList<>();
-        MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
-        for (MediaCodecInfo codecInfo : list.getCodecInfos()) {
-            if (codecInfo.isEncoder() && Arrays.asList(codecInfo.getSupportedTypes()).contains(videoMimeType)) {
-                result.add(codecInfo);
-            }
-        }
-        return result.toArray(new MediaCodecInfo[result.size()]);
-    }
-
     private static MediaCodec createMediaCodec(Codec codec, String encoderName) throws IOException, ConfigurationException {
         if (encoderName != null) {
             Ln.d("Creating encoder by name: '" + encoderName + "'");
             try {
                 return MediaCodec.createByCodecName(encoderName);
             } catch (IllegalArgumentException e) {
-                Ln.e(buildUnknownEncoderMessage(codec, encoderName));
+                Ln.e(CodecUtils.buildUnknownEncoderMessage(codec, encoderName));
                 throw new ConfigurationException("Unknown encoder: " + encoderName);
             }
         }
@@ -225,18 +211,6 @@ private static MediaCodec createMediaCodec(Codec codec, String encoderName) thro
         return mediaCodec;
     }
 
-    private static String buildUnknownEncoderMessage(Codec codec, String encoderName) {
-        StringBuilder msg = new StringBuilder("Encoder '").append(encoderName).append("' for ").append(codec.getName()).append(" not found");
-        MediaCodecInfo[] encoders = listEncoders(codec.getMimeType());
-        if (encoders != null && encoders.length > 0) {
-            msg.append("\nTry to use one of the available encoders:");
-            for (MediaCodecInfo encoder : encoders) {
-                msg.append("\n    scrcpy --video-codec=").append(codec.getName()).append(" --encoder='").append(encoder.getName()).append("'");
-            }
-        }
-        return msg.toString();
-    }
-
     private static MediaFormat createFormat(String videoMimeType, int bitRate, int maxFps, List<CodecOption> codecOptions) {
         MediaFormat format = new MediaFormat();
         format.setString(MediaFormat.KEY_MIME, videoMimeType);