diff --git a/api/current.txt b/api/current.txt
index 326ae6b54b0b0..2dfa2e54ce05d 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -25986,6 +25986,7 @@ package android.media {
     field public static final String KEY_CAPTURE_RATE = "capture-rate";
     field public static final String KEY_CHANNEL_COUNT = "channel-count";
     field public static final String KEY_CHANNEL_MASK = "channel-mask";
+    field public static final String KEY_CODECS_STRING = "codecs-string";
     field public static final String KEY_COLOR_FORMAT = "color-format";
     field public static final String KEY_COLOR_RANGE = "color-range";
     field public static final String KEY_COLOR_STANDARD = "color-standard";
diff --git a/media/java/android/media/MediaFormat.java b/media/java/android/media/MediaFormat.java
index f408ac344d7cf..f61d55ef2a30e 100644
--- a/media/java/android/media/MediaFormat.java
+++ b/media/java/android/media/MediaFormat.java
@@ -20,6 +20,8 @@ import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.media.MediaCodec;
+import android.media.MediaParser;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -45,6 +47,7 @@ import java.util.stream.Collectors;
  * <table>
  * <tr><th>Name</th><th>Value Type</th><th>Description</th></tr>
  * <tr><td>{@link #KEY_MIME}</td><td>String</td><td>The type of the format.</td></tr>
+ * <tr><td>{@link #KEY_CODECS_STRING}</td><td>String</td><td>optional, the RFC 6381 codecs string of the MediaFormat</td></tr>
  * <tr><td>{@link #KEY_MAX_INPUT_SIZE}</td><td>Integer</td><td>optional, maximum size of a buffer of input data</td></tr>
  * <tr><td>{@link #KEY_PIXEL_ASPECT_RATIO_WIDTH}</td><td>Integer</td><td>optional, the pixel aspect ratio width</td></tr>
  * <tr><td>{@link #KEY_PIXEL_ASPECT_RATIO_HEIGHT}</td><td>Integer</td><td>optional, the pixel aspect ratio height</td></tr>
@@ -216,6 +219,15 @@ public final class MediaFormat {
      */
     public static final String KEY_MIME = "mime";
 
+    /**
+     * A key describing the codecs string of the MediaFormat. See RFC 6381 section 3.2 for the
+     * syntax of the value. The value does not hold {@link MediaCodec}-exposed codec names.
+     * The associated value is a string.
+     *
+     * @see MediaParser.TrackData#mediaFormat
+     */
+    public static final String KEY_CODECS_STRING = "codecs-string";
+
     /**
      * An optional key describing the low latency decoding mode. This is an optional parameter
      * that applies only to decoders. If enabled, the decoder doesn't hold input and output