Add --audio-encoder option

Similar to --video-encoder, but for audio.

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

@@ -45,6 +45,7 @@ public final class AudioEncoder {
 
     private final Streamer streamer;
     private final int bitRate;
+    private final String encoderName;
 
     private AudioRecord recorder;
     private MediaCodec mediaCodec;
@@ -62,9 +63,10 @@ public final class AudioEncoder {
 
     private boolean ended;
 
-    public AudioEncoder(Streamer streamer, int bitRate) {
+    public AudioEncoder(Streamer streamer, int bitRate, String encoderName) {
         this.streamer = streamer;
         this.bitRate = bitRate;
+        this.encoderName = encoderName;
     }
 
     private static AudioFormat createAudioFormat() {
@@ -208,15 +210,15 @@ public final class AudioEncoder {
 
         try {
             try {
-                String mimeType = streamer.getCodec().getMimeType();
+                Codec codec = streamer.getCodec();
 
-                mediaCodec = MediaCodec.createEncoderByType(mimeType); // may throw IOException
+                mediaCodec = createMediaCodec(codec, encoderName);
                 recorder = createAudioRecord();
 
                 mediaCodecThread = new HandlerThread("AudioEncoder");
                 mediaCodecThread.start();
 
-                MediaFormat format = createFormat(mimeType, bitRate);
+                MediaFormat format = createFormat(codec.getMimeType(), bitRate);
                 mediaCodec.setCallback(new EncoderCallback(), new Handler(mediaCodecThread.getLooper()));
                 mediaCodec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
 
@@ -255,6 +257,8 @@ public final class AudioEncoder {
             mediaCodec.start();
             inputThread.start();
             outputThread.start();
+        } catch (ConfigurationException e) {
+            // Do not print stack trace, a user-friendly error-message has already been logged
         } catch (Throwable e) {
             if (mediaCodec != null) {
                 mediaCodec.release();
@@ -272,6 +276,21 @@ public final class AudioEncoder {
         }
     }
 
+    private static MediaCodec createMediaCodec(Codec codec, String encoderName) throws IOException, ConfigurationException {
+        if (encoderName != null) {
+            Ln.d("Creating audio encoder by name: '" + encoderName + "'");
+            try {
+                return MediaCodec.createByCodecName(encoderName);
+            } catch (IllegalArgumentException e) {
+                Ln.e(CodecUtils.buildUnknownEncoderMessage(codec, encoderName));
+                throw new ConfigurationException("Unknown encoder: " + encoderName);
+            }
+        }
+        MediaCodec mediaCodec = MediaCodec.createEncoderByType(codec.getMimeType());
+        Ln.d("Using audio encoder: '" + mediaCodec.getName() + "'");
+        return mediaCodec;
+    }
+
     private void cleanUp() {
         mediaCodecThread.getLooper().quit();
         inputThread.interrupt();

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

@@ -18,8 +18,10 @@ public final class CodecUtils {
         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 ? "codec" : "audio-codec";
             for (MediaCodecInfo encoder : encoders) {
-                msg.append("\n    scrcpy --codec=").append(codec.getName()).append(" --encoder='").append(encoder.getName()).append("'");
+                msg.append("\n    scrcpy --").append(codecOption).append("=").append(codec.getName());
+                msg.append(" --encoder='").append(encoder.getName()).append("'");
             }
         }
         return msg.toString();

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

@@ -24,6 +24,7 @@ public class Options {
     private boolean stayAwake;
     private List<CodecOption> codecOptions;
     private String encoderName;
+    private String audioEncoderName;
     private boolean powerOffScreenOnClose;
     private boolean clipboardAutosync = true;
     private boolean downsizeOnError = true;
@@ -180,6 +181,14 @@ public class Options {
         this.encoderName = encoderName;
     }
 
+    public String getAudioEncoderName() {
+        return audioEncoderName;
+    }
+
+    public void setAudioEncoderName(String audioEncoderName) {
+        this.audioEncoderName = audioEncoderName;
+    }
+
     public void setPowerOffScreenOnClose(boolean powerOffScreenOnClose) {
         this.powerOffScreenOnClose = powerOffScreenOnClose;
     }

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

@@ -113,7 +113,7 @@ public final class Server {
             if (audio) {
                 Streamer audioStreamer = new Streamer(connection.getAudioFd(), options.getAudioCodec(), options.getSendCodecId(),
                         options.getSendFrameMeta());
-                audioEncoder = new AudioEncoder(audioStreamer, options.getAudioBitRate());
+                audioEncoder = new AudioEncoder(audioStreamer, options.getAudioBitRate(), options.getAudioEncoderName());
                 audioEncoder.start();
             }
 
@@ -264,6 +264,10 @@ public final class Server {
                         options.setEncoderName(value);
                     }
                     break;
+                case "audio_encoder_name":
+                    if (!value.isEmpty()) {
+                        options.setAudioEncoderName(value);
+                    }
                 case "power_off_on_close":
                     boolean powerOffScreenOnClose = Boolean.parseBoolean(value);
                     options.setPowerOffScreenOnClose(powerOffScreenOnClose);