Make streamer independent of codec type

Rename VideoStreamer to Streamer, and extract a Codec interface which
will also support audio codecs.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>

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

@@ -0,0 +1,16 @@
+package com.genymobile.scrcpy;
+
+public interface Codec {
+
+    enum Type {
+        VIDEO,
+    }
+
+    Type getType();
+
+    int getId();
+
+    String getName();
+
+    String getMimeType();
+}

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

@@ -32,7 +32,7 @@ public class ScreenEncoder implements Device.RotationListener {
     private final AtomicBoolean rotationChanged = new AtomicBoolean();
 
     private final Device device;
-    private final VideoStreamer streamer;
+    private final Streamer streamer;
     private final String encoderName;
     private final List<CodecOption> codecOptions;
     private final int bitRate;
@@ -42,7 +42,7 @@ public class ScreenEncoder implements Device.RotationListener {
     private boolean firstFrameSent;
     private int consecutiveErrors;
 
-    public ScreenEncoder(Device device, VideoStreamer streamer, int bitRate, int maxFps, List<CodecOption> codecOptions, String encoderName,
+    public ScreenEncoder(Device device, Streamer streamer, int bitRate, int maxFps, List<CodecOption> codecOptions, String encoderName,
             boolean downsizeOnError) {
         this.device = device;
         this.streamer = streamer;
@@ -164,7 +164,7 @@ public class ScreenEncoder implements Device.RotationListener {
         return 0;
     }
 
-    private boolean encode(MediaCodec codec, VideoStreamer streamer) throws IOException {
+    private boolean encode(MediaCodec codec, Streamer streamer) throws IOException {
         boolean eof = false;
         MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
 

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

@@ -100,9 +100,9 @@ public final class Server {
                 device.setClipboardListener(text -> controllerRef.getSender().pushClipboardText(text));
             }
 
-            VideoStreamer videoStreamer = new VideoStreamer(connection.getVideoFd(), codec, options.getSendCodecId(), options.getSendFrameMeta());
-            ScreenEncoder screenEncoder = new ScreenEncoder(device, videoStreamer, options.getBitRate(), options.getMaxFps(), codecOptions,
-                    options.getEncoderName(), options.getDownsizeOnError());
+            Streamer videoStreamer = new Streamer(connection.getVideoFd(), codec, options.getSendCodecId(), options.getSendFrameMeta());
+            ScreenEncoder screenEncoder = new ScreenEncoder(device, videoStreamer, options.getBitRate(), options.getMaxFps(),
+                    codecOptions, options.getEncoderName(), options.getDownsizeOnError());
             try {
                 // synchronous
                 screenEncoder.streamScreen();

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

@@ -6,26 +6,26 @@ import java.io.FileDescriptor;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 
-public final class VideoStreamer {
+public final class Streamer {
 
     private static final long PACKET_FLAG_CONFIG = 1L << 63;
     private static final long PACKET_FLAG_KEY_FRAME = 1L << 62;
 
     private final FileDescriptor fd;
-    private final VideoCodec codec;
+    private final Codec codec;
     private final boolean sendCodecId;
     private final boolean sendFrameMeta;
 
     private final ByteBuffer headerBuffer = ByteBuffer.allocate(12);
 
-    public VideoStreamer(FileDescriptor fd, VideoCodec codec, boolean sendCodecId, boolean sendFrameMeta) {
+    public Streamer(FileDescriptor fd, Codec codec, boolean sendCodecId, boolean sendFrameMeta) {
         this.fd = fd;
         this.codec = codec;
         this.sendCodecId = sendCodecId;
         this.sendFrameMeta = sendFrameMeta;
     }
 
-    public VideoCodec getCodec() {
+    public Codec getCodec() {
         return codec;
     }
 

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

@@ -3,7 +3,7 @@ package com.genymobile.scrcpy;
 import android.annotation.SuppressLint;
 import android.media.MediaFormat;
 
-public enum VideoCodec {
+public enum VideoCodec implements Codec {
     H264(0x68_32_36_34, "h264", MediaFormat.MIMETYPE_VIDEO_AVC),
     H265(0x68_32_36_35, "h265", MediaFormat.MIMETYPE_VIDEO_HEVC),
     @SuppressLint("InlinedApi") // introduced in API 21
@@ -19,10 +19,22 @@ public enum VideoCodec {
         this.mimeType = mimeType;
     }
 
+    @Override
+    public Type getType() {
+        return Type.VIDEO;
+    }
+
+    @Override
     public int getId() {
         return id;
     }
 
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
     public String getMimeType() {
         return mimeType;
     }