diff --git a/api/current.txt b/api/current.txt
index 13b50876e9583..cdc451cc0aa2a 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -20999,6 +20999,7 @@ package android.media {
     field public static final java.lang.String KEY_SLICE_HEIGHT = "slice-height";
     field public static final java.lang.String KEY_STRIDE = "stride";
     field public static final java.lang.String KEY_TEMPORAL_LAYERING = "ts-schema";
+    field public static final java.lang.String KEY_TRACK_ID = "track-id";
     field public static final java.lang.String KEY_WIDTH = "width";
     field public static final java.lang.String MIMETYPE_AUDIO_AAC = "audio/mp4a-latm";
     field public static final java.lang.String MIMETYPE_AUDIO_AC3 = "audio/ac3";
diff --git a/api/system-current.txt b/api/system-current.txt
index 125071daa4001..ad0c237f0457b 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -22507,6 +22507,7 @@ package android.media {
     field public static final java.lang.String KEY_SLICE_HEIGHT = "slice-height";
     field public static final java.lang.String KEY_STRIDE = "stride";
     field public static final java.lang.String KEY_TEMPORAL_LAYERING = "ts-schema";
+    field public static final java.lang.String KEY_TRACK_ID = "track-id";
     field public static final java.lang.String KEY_WIDTH = "width";
     field public static final java.lang.String MIMETYPE_AUDIO_AAC = "audio/mp4a-latm";
     field public static final java.lang.String MIMETYPE_AUDIO_AC3 = "audio/ac3";
diff --git a/api/test-current.txt b/api/test-current.txt
index af4fddbce7bda..12c5e1eba9a47 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -21008,6 +21008,7 @@ package android.media {
     field public static final java.lang.String KEY_SLICE_HEIGHT = "slice-height";
     field public static final java.lang.String KEY_STRIDE = "stride";
     field public static final java.lang.String KEY_TEMPORAL_LAYERING = "ts-schema";
+    field public static final java.lang.String KEY_TRACK_ID = "track-id";
     field public static final java.lang.String KEY_WIDTH = "width";
     field public static final java.lang.String MIMETYPE_AUDIO_AAC = "audio/mp4a-latm";
     field public static final java.lang.String MIMETYPE_AUDIO_AC3 = "audio/ac3";
diff --git a/media/java/android/media/MediaFormat.java b/media/java/android/media/MediaFormat.java
index 646ab4ef18046..a0e2481d4fdc4 100644
--- a/media/java/android/media/MediaFormat.java
+++ b/media/java/android/media/MediaFormat.java
@@ -644,6 +644,21 @@ public final class MediaFormat {
     /** Full range. Y, Cr and Cb component values range from 0 to 255 for 8-bit content. */
     public static final int COLOR_RANGE_FULL = 1;
 
+    /**
+     * A key describing a unique ID for the content of a media track.
+     *
+     * <p>This key is used by {@link MediaExtractor}. Some extractors provide multiple encodings
+     * of the same track (e.g. float audio tracks for FLAC and WAV may be expressed as two
+     * tracks via MediaExtractor: a normal PCM track for backward compatibility, and a float PCM
+     * track for added fidelity. Similarly, Dolby Vision extractor may provide a baseline SDR
+     * version of a DV track.) This key can be used to identify which MediaExtractor tracks refer
+     * to the same underlying content.
+     * </p>
+     *
+     * The associated value is an integer.
+     */
+    public static final String KEY_TRACK_ID = "track-id";
+
     /* package private */ MediaFormat(Map<String, Object> map) {
         mMap = map;
     }