Exports API to allow RULE_MATCH_UID support both RECORDERS and PLAYERS mix type

Removes @hide to export AudioMixingRule#Builder#setTargetMixType(), AudioMix#MIX_TYPE_PLAYERS and AudioMix#MIX_TYPE_RECORDERS.

Bug: 183693610
Test: atest com.google.android.gts.audioservice.AudioServiceHostTest
CTS-Coverage-Bug: 191716676
Change-Id: I8eebfc8c139b0bd3ef277863eb46d2c3383eb65e

core/api/system-current.txt

@@ -5410,6 +5410,8 @@ package android.media.audiopolicy {
     field public static final int MIX_STATE_DISABLED = -1; // 0xffffffff
     field public static final int MIX_STATE_IDLE = 0; // 0x0
     field public static final int MIX_STATE_MIXING = 1; // 0x1
+    field public static final int MIX_TYPE_PLAYERS = 0; // 0x0
+    field public static final int MIX_TYPE_RECORDERS = 1; // 0x1
     field public static final int ROUTE_FLAG_LOOP_BACK = 2; // 0x2
     field public static final int ROUTE_FLAG_RENDER = 1; // 0x1
   }
@@ -5423,6 +5425,7 @@ package android.media.audiopolicy {
   }
 
   public class AudioMixingRule {
+    method public int getTargetMixType();
     field public static final int RULE_MATCH_ATTRIBUTE_CAPTURE_PRESET = 2; // 0x2
     field public static final int RULE_MATCH_ATTRIBUTE_USAGE = 1; // 0x1
     field public static final int RULE_MATCH_UID = 4; // 0x4
@@ -5437,6 +5440,7 @@ package android.media.audiopolicy {
     method public android.media.audiopolicy.AudioMixingRule build();
     method public android.media.audiopolicy.AudioMixingRule.Builder excludeMixRule(int, Object) throws java.lang.IllegalArgumentException;
     method public android.media.audiopolicy.AudioMixingRule.Builder excludeRule(android.media.AudioAttributes, int) throws java.lang.IllegalArgumentException;
+    method @NonNull public android.media.audiopolicy.AudioMixingRule.Builder setTargetMixType(int);
   }
 
   public class AudioPolicy {

media/java/android/media/audiopolicy/AudioMix.java

@@ -113,12 +113,10 @@ public class AudioMix {
      */
     public static final int MIX_TYPE_INVALID = -1;
     /**
-     * @hide
      * Mix type indicating playback streams are mixed.
      */
     public static final int MIX_TYPE_PLAYERS = 0;
     /**
-     * @hide
      * Mix type indicating recording streams are mixed.
      */
     public static final int MIX_TYPE_RECORDERS = 1;

media/java/android/media/audiopolicy/AudioMixingRule.java

@@ -16,6 +16,9 @@
 
 package android.media.audiopolicy;
 
+import static java.lang.annotation.RetentionPolicy.SOURCE;
+
+import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
@@ -24,6 +27,7 @@ import android.os.Build;
 import android.os.Parcel;
 import android.util.Log;
 
+import java.lang.annotation.Retention;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.Objects;
@@ -199,7 +203,19 @@ public class AudioMixingRule {
     }
 
     private final int mTargetMixType;
-    int getTargetMixType() { return mTargetMixType; }
+
+    /** @hide */
+    @IntDef({AudioMix.MIX_TYPE_PLAYERS, AudioMix.MIX_TYPE_RECORDERS})
+    @Retention(SOURCE)
+    public @interface MixType {}
+
+    /**
+     * Gets target mix type of the mixing rule.
+     */
+    public @MixType int getTargetMixType() {
+        return mTargetMixType;
+    }
+
     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private final ArrayList<AudioMixMatchCriterion> mCriteria;
     /** @hide */
@@ -469,17 +485,24 @@ public class AudioMixingRule {
         }
 
         /**
-         * Set target mix type of the mixing rule.
+         * Sets target mix type of the mixing rule.
          *
-         * <p>Note: If the mix type was not specified, it will be decided automatically by mixing
-         * rule. For {@link #RULE_MATCH_UID}, the default type is {@link AudioMix#MIX_TYPE_PLAYERS}.
+         * <p>Note: If the mix type was not specified, it will be decided automatically by matched
+         * mixing rule. For example, {@link AudioMixingRule#RULE_MATCH_ATTRIBUTE_USAGE} or {@link
+         * AudioMixingRule#RULE_MATCH_USERID} applied {@link AudioMix#MIX_TYPE_PLAYERS}, {@link
+         * AudioMixingRule#RULE_MATCH_ATTRIBUTE_CAPTURE_PRESET} applied {@link
+         * AudioMix#MIX_TYPE_RECORDERS}. For {@link AudioMixingRule#RULE_MATCH_UID}, the mix type
+         * could be {@link AudioMix#MIX_TYPE_PLAYERS} or {@link AudioMix#MIX_TYPE_RECORDERS}, and
+         * {@link AudioMix#MIX_TYPE_PLAYERS} is the default value.
          *
          * @param mixType {@link AudioMix#MIX_TYPE_PLAYERS} or {@link AudioMix#MIX_TYPE_RECORDERS}
          * @return the same Builder instance.
-         *
-         * @hide
          */
-        public @NonNull Builder setTargetMixType(int mixType) {
+        public @NonNull Builder setTargetMixType(@MixType int mixType) {
+            if (mixType != AudioMix.MIX_TYPE_PLAYERS && mixType != AudioMix.MIX_TYPE_RECORDERS) {
+                throw new IllegalArgumentException("Illegal argument for mix type");
+            }
+
             mTargetMixType = mixType;
             Log.i("AudioMixingRule", "Builder setTargetMixType " + mixType);
             return this;