diff --git a/camera/ndk/include/camera/NdkCameraCaptureSession.h b/camera/ndk/include/camera/NdkCameraCaptureSession.h
index 78e062a..9bf8247 100644
--- a/camera/ndk/include/camera/NdkCameraCaptureSession.h
+++ b/camera/ndk/include/camera/NdkCameraCaptureSession.h
@@ -45,8 +45,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 /**
  * ACameraCaptureSession is an opaque type that manages frame captures of a camera device.
  *
@@ -434,7 +432,7 @@
  *
  */
 camera_status_t ACameraCaptureSession_getDevice(
-        ACameraCaptureSession* session, /*out*/ACameraDevice** device);
+        ACameraCaptureSession* session, /*out*/ACameraDevice** device) __INTRODUCED_IN(24);
 
 /**
  * Submit an array of requests to be captured in sequence as a burst in the minimum of time possible.
@@ -472,7 +470,7 @@
         ACameraCaptureSession* session,
         /*optional*/ACameraCaptureSession_captureCallbacks* callbacks,
         int numRequests, ACaptureRequest** requests,
-        /*optional*/int* captureSequenceId);
+        /*optional*/int* captureSequenceId) __INTRODUCED_IN(24);
 
 /**
  * Request endlessly repeating capture of a sequence of images by this capture session.
@@ -526,7 +524,7 @@
         ACameraCaptureSession* session,
         /*optional*/ACameraCaptureSession_captureCallbacks* callbacks,
         int numRequests, ACaptureRequest** requests,
-        /*optional*/int* captureSequenceId);
+        /*optional*/int* captureSequenceId) __INTRODUCED_IN(24);
 
 /**
  * Cancel any ongoing repeating capture set by {@link ACameraCaptureSession_setRepeatingRequest}.
@@ -549,7 +547,8 @@
  *         <li>{@link ACAMERA_ERROR_CAMERA_SERVICE} if the camera service encounters fatal error</li>
  *         <li>{@link ACAMERA_ERROR_UNKNOWN} if the method fails for some other reasons</li></ul>
  */
-camera_status_t ACameraCaptureSession_stopRepeating(ACameraCaptureSession* session);
+camera_status_t ACameraCaptureSession_stopRepeating(ACameraCaptureSession* session)
+        __INTRODUCED_IN(24);
 
 /**
  * Discard all captures currently pending and in-progress as fast as possible.
@@ -589,11 +588,8 @@
  *         <li>{@link ACAMERA_ERROR_CAMERA_SERVICE} if the camera service encounters fatal error</li>
  *         <li>{@link ACAMERA_ERROR_UNKNOWN} if the method fails for some other reasons</li></ul>
  */
-camera_status_t ACameraCaptureSession_abortCaptures(ACameraCaptureSession* session);
-
-#endif /* __ANDROID_API__ >= 24 */
-
-#if __ANDROID_API__ >= 28
+camera_status_t ACameraCaptureSession_abortCaptures(ACameraCaptureSession* session)
+        __INTRODUCED_IN(24);
 
 typedef struct ACaptureSessionOutput ACaptureSessionOutput;
 
@@ -638,8 +634,7 @@
  *         <li>{@link ACAMERA_ERROR_UNKNOWN} if the method fails for some other reasons</li></ul>
  */
 camera_status_t ACameraCaptureSession_updateSharedOutput(ACameraCaptureSession* session,
-        ACaptureSessionOutput* output);
-#endif /* __ANDROID_API__ >= 28 */
+        ACaptureSessionOutput* output) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/camera/ndk/include/camera/NdkCameraDevice.h b/camera/ndk/include/camera/NdkCameraDevice.h
index b715b12..bdd27f9 100644
--- a/camera/ndk/include/camera/NdkCameraDevice.h
+++ b/camera/ndk/include/camera/NdkCameraDevice.h
@@ -44,8 +44,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 /**
  * ACameraDevice is opaque type that provides access to a camera device.
  *
@@ -176,7 +174,7 @@
  *         <li>{@link ACAMERA_OK} if the method call succeeds.</li>
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if device is NULL.</li></ul>
  */
-camera_status_t ACameraDevice_close(ACameraDevice* device);
+camera_status_t ACameraDevice_close(ACameraDevice* device) __INTRODUCED_IN(24);
 
 /**
  * Return the camera id associated with this camera device.
@@ -187,7 +185,7 @@
  * delete/free by the application. Also the returned string must not be used after the device
  * has been closed.
  */
-const char* ACameraDevice_getId(const ACameraDevice* device);
+const char* ACameraDevice_getId(const ACameraDevice* device) __INTRODUCED_IN(24);
 
 typedef enum {
     /**
@@ -290,7 +288,7 @@
  */
 camera_status_t ACameraDevice_createCaptureRequest(
         const ACameraDevice* device, ACameraDevice_request_template templateId,
-        /*out*/ACaptureRequest** request);
+        /*out*/ACaptureRequest** request) __INTRODUCED_IN(24);
 
 
 typedef struct ACaptureSessionOutputContainer ACaptureSessionOutputContainer;
@@ -313,7 +311,7 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if container is NULL.</li></ul>
  */
 camera_status_t ACaptureSessionOutputContainer_create(
-        /*out*/ACaptureSessionOutputContainer** container);
+        /*out*/ACaptureSessionOutputContainer** container) __INTRODUCED_IN(24);
 
 /**
  * Free a capture session output container.
@@ -322,7 +320,8 @@
  *
  * @see ACaptureSessionOutputContainer_create
  */
-void            ACaptureSessionOutputContainer_free(ACaptureSessionOutputContainer* container);
+void            ACaptureSessionOutputContainer_free(ACaptureSessionOutputContainer* container)
+        __INTRODUCED_IN(24);
 
 /**
  * Create a ACaptureSessionOutput object.
@@ -344,7 +343,7 @@
  * @see ACaptureSessionOutputContainer_add
  */
 camera_status_t ACaptureSessionOutput_create(
-        ANativeWindow* anw, /*out*/ACaptureSessionOutput** output);
+        ANativeWindow* anw, /*out*/ACaptureSessionOutput** output) __INTRODUCED_IN(24);
 
 /**
  * Free a ACaptureSessionOutput object.
@@ -353,7 +352,7 @@
  *
  * @see ACaptureSessionOutput_create
  */
-void            ACaptureSessionOutput_free(ACaptureSessionOutput* output);
+void            ACaptureSessionOutput_free(ACaptureSessionOutput* output) __INTRODUCED_IN(24);
 
 /**
  * Add an {@link ACaptureSessionOutput} object to {@link ACaptureSessionOutputContainer}.
@@ -366,7 +365,8 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if container or output is NULL.</li></ul>
  */
 camera_status_t ACaptureSessionOutputContainer_add(
-        ACaptureSessionOutputContainer* container, const ACaptureSessionOutput* output);
+        ACaptureSessionOutputContainer* container, const ACaptureSessionOutput* output)
+        __INTRODUCED_IN(24);
 
 /**
  * Remove an {@link ACaptureSessionOutput} object from {@link ACaptureSessionOutputContainer}.
@@ -382,7 +382,8 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if container or output is NULL.</li></ul>
  */
 camera_status_t ACaptureSessionOutputContainer_remove(
-        ACaptureSessionOutputContainer* container, const ACaptureSessionOutput* output);
+        ACaptureSessionOutputContainer* container, const ACaptureSessionOutput* output)
+        __INTRODUCED_IN(24);
 
 /**
  * Create a new camera capture session by providing the target output set of {@link ANativeWindow}
@@ -663,11 +664,7 @@
         ACameraDevice* device,
         const ACaptureSessionOutputContainer*       outputs,
         const ACameraCaptureSession_stateCallbacks* callbacks,
-        /*out*/ACameraCaptureSession** session);
-
-#endif /* __ANDROID_API__ >= 24 */
-
-#if __ANDROID_API__ >= 28
+        /*out*/ACameraCaptureSession** session) __INTRODUCED_IN(24);
 
 /**
  * Create a shared ACaptureSessionOutput object.
@@ -691,7 +688,7 @@
  * @see ACaptureSessionOutputContainer_add
  */
 camera_status_t ACaptureSessionSharedOutput_create(
-        ANativeWindow* anw, /*out*/ACaptureSessionOutput** output);
+        ANativeWindow* anw, /*out*/ACaptureSessionOutput** output) __INTRODUCED_IN(28);
 
 /**
  * Add a native window to shared ACaptureSessionOutput.
@@ -708,7 +705,8 @@
  *             window associated with ACaptureSessionOutput; or anw is already present inside
  *             ACaptureSessionOutput.</li></ul>
  */
-camera_status_t ACaptureSessionSharedOutput_add(ACaptureSessionOutput *output, ANativeWindow *anw);
+camera_status_t ACaptureSessionSharedOutput_add(ACaptureSessionOutput *output,
+        ANativeWindow *anw) __INTRODUCED_IN(28);
 
 /**
  * Remove a native window from shared ACaptureSessionOutput.
@@ -724,7 +722,7 @@
  *             ACaptureSessionOutput.</li></ul>
  */
 camera_status_t ACaptureSessionSharedOutput_remove(ACaptureSessionOutput *output,
-        ANativeWindow* anw);
+        ANativeWindow* anw) __INTRODUCED_IN(28);
 
 /**
  * Create a new camera capture session similar to {@link ACameraDevice_createCaptureSession}. This
@@ -757,9 +755,7 @@
         const ACaptureSessionOutputContainer* outputs,
         const ACaptureRequest* sessionParameters,
         const ACameraCaptureSession_stateCallbacks* callbacks,
-        /*out*/ACameraCaptureSession** session);
-
-#endif /* __ANDROID_API__ >= 28 */
+        /*out*/ACameraCaptureSession** session) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/camera/ndk/include/camera/NdkCameraError.h b/camera/ndk/include/camera/NdkCameraError.h
index 6b58155..e19ce36 100644
--- a/camera/ndk/include/camera/NdkCameraError.h
+++ b/camera/ndk/include/camera/NdkCameraError.h
@@ -40,8 +40,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 typedef enum {
     ACAMERA_OK = 0,
 
@@ -132,8 +130,6 @@
     ACAMERA_ERROR_PERMISSION_DENIED     = ACAMERA_ERROR_BASE - 13,
 } camera_status_t;
 
-#endif /* __ANDROID_API__ >= 24 */
-
 __END_DECLS
 
 #endif /* _NDK_CAMERA_ERROR_H */
diff --git a/camera/ndk/include/camera/NdkCameraManager.h b/camera/ndk/include/camera/NdkCameraManager.h
index e5b3ad8..a1cca4d 100644
--- a/camera/ndk/include/camera/NdkCameraManager.h
+++ b/camera/ndk/include/camera/NdkCameraManager.h
@@ -44,8 +44,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 /**
  * ACameraManager is opaque type that provides access to camera service.
  *
@@ -65,14 +63,14 @@
  * @return a {@link ACameraManager} instance.
  *
  */
-ACameraManager* ACameraManager_create();
+ACameraManager* ACameraManager_create() __INTRODUCED_IN(24);
 
 /**
  * <p>Delete the {@link ACameraManager} instance and free its resources. </p>
  *
  * @param manager the {@link ACameraManager} instance to be deleted.
  */
-void ACameraManager_delete(ACameraManager* manager);
+void ACameraManager_delete(ACameraManager* manager) __INTRODUCED_IN(24);
 
 /// Struct to hold list of camera devices
 typedef struct ACameraIdList {
@@ -102,14 +100,14 @@
  *         <li>{@link ACAMERA_ERROR_NOT_ENOUGH_MEMORY} if allocating memory fails.</li></ul>
  */
 camera_status_t ACameraManager_getCameraIdList(ACameraManager* manager,
-                                              /*out*/ACameraIdList** cameraIdList);
+        /*out*/ACameraIdList** cameraIdList) __INTRODUCED_IN(24);
 
 /**
  * Delete a list of camera devices allocated via {@link ACameraManager_getCameraIdList}.
  *
  * @param cameraIdList the {@link ACameraIdList} to be deleted.
  */
-void ACameraManager_deleteCameraIdList(ACameraIdList* cameraIdList);
+void ACameraManager_deleteCameraIdList(ACameraIdList* cameraIdList) __INTRODUCED_IN(24);
 
 /**
  * Definition of camera availability callbacks.
@@ -120,7 +118,8 @@
  *                 argument is owned by camera framework and will become invalid immediately after
  *                 this callback returns.
  */
-typedef void (*ACameraManager_AvailabilityCallback)(void* context, const char* cameraId);
+typedef void (*ACameraManager_AvailabilityCallback)(void* context,
+        const char* cameraId) __INTRODUCED_IN(24);
 
 /**
  * A listener for camera devices becoming available or unavailable to open.
@@ -168,7 +167,8 @@
  *                  {ACameraManager_AvailabilityCallbacks#onCameraUnavailable} is NULL.</li></ul>
  */
 camera_status_t ACameraManager_registerAvailabilityCallback(
-        ACameraManager* manager, const ACameraManager_AvailabilityCallbacks* callback);
+        ACameraManager* manager,
+        const ACameraManager_AvailabilityCallbacks* callback) __INTRODUCED_IN(24);
 
 /**
  * Unregister camera availability callbacks.
@@ -185,7 +185,8 @@
  *                  {ACameraManager_AvailabilityCallbacks#onCameraUnavailable} is NULL.</li></ul>
  */
 camera_status_t ACameraManager_unregisterAvailabilityCallback(
-        ACameraManager* manager, const ACameraManager_AvailabilityCallbacks* callback);
+        ACameraManager* manager,
+        const ACameraManager_AvailabilityCallbacks* callback) __INTRODUCED_IN(24);
 
 /**
  * Query the capabilities of a camera device. These capabilities are
@@ -211,7 +212,7 @@
  */
 camera_status_t ACameraManager_getCameraCharacteristics(
         ACameraManager* manager, const char* cameraId,
-        /*out*/ACameraMetadata** characteristics);
+        /*out*/ACameraMetadata** characteristics) __INTRODUCED_IN(24);
 
 /**
  * Open a connection to a camera with the given ID. The opened camera device will be
@@ -271,9 +272,7 @@
 camera_status_t ACameraManager_openCamera(
         ACameraManager* manager, const char* cameraId,
         ACameraDevice_StateCallbacks* callback,
-        /*out*/ACameraDevice** device);
-
-#endif /* __ANDROID_API__ >= 24 */
+        /*out*/ACameraDevice** device) __INTRODUCED_IN(24);
 
 __END_DECLS
 
diff --git a/camera/ndk/include/camera/NdkCameraMetadata.h b/camera/ndk/include/camera/NdkCameraMetadata.h
index bdb1587..2078da7 100644
--- a/camera/ndk/include/camera/NdkCameraMetadata.h
+++ b/camera/ndk/include/camera/NdkCameraMetadata.h
@@ -44,8 +44,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 /**
  * ACameraMetadata is opaque type that provides access to read-only camera metadata like camera
  * characteristics (via {@link ACameraManager_getCameraCharacteristics}) or capture results (via
@@ -191,7 +189,8 @@
  *             of input tag value.</li></ul>
  */
 camera_status_t ACameraMetadata_getConstEntry(
-        const ACameraMetadata* metadata, uint32_t tag, /*out*/ACameraMetadata_const_entry* entry);
+        const ACameraMetadata* metadata,
+        uint32_t tag, /*out*/ACameraMetadata_const_entry* entry) __INTRODUCED_IN(24);
 
 /**
  * List all the entry tags in input {@link ACameraMetadata}.
@@ -208,7 +207,8 @@
  *         <li>{@link ACAMERA_ERROR_UNKNOWN} if the method fails for some other reasons.</li></ul>
  */
 camera_status_t ACameraMetadata_getAllTags(
-        const ACameraMetadata* metadata, /*out*/int32_t* numEntries, /*out*/const uint32_t** tags);
+        const ACameraMetadata* metadata,
+        /*out*/int32_t* numEntries, /*out*/const uint32_t** tags) __INTRODUCED_IN(24);
 
 /**
  * Create a copy of input {@link ACameraMetadata}.
@@ -220,16 +220,14 @@
  *
  * @return a valid ACameraMetadata pointer or NULL if the input metadata cannot be copied.
  */
-ACameraMetadata* ACameraMetadata_copy(const ACameraMetadata* src);
+ACameraMetadata* ACameraMetadata_copy(const ACameraMetadata* src) __INTRODUCED_IN(24);
 
 /**
  * Free a {@link ACameraMetadata} structure.
  *
  * @param metadata the {@link ACameraMetadata} to be freed.
  */
-void ACameraMetadata_free(ACameraMetadata* metadata);
-
-#endif /* __ANDROID_API__ >= 24 */
+void ACameraMetadata_free(ACameraMetadata* metadata) __INTRODUCED_IN(24);
 
 __END_DECLS
 
diff --git a/camera/ndk/include/camera/NdkCameraMetadataTags.h b/camera/ndk/include/camera/NdkCameraMetadataTags.h
index 3010646..bd85469 100644
--- a/camera/ndk/include/camera/NdkCameraMetadataTags.h
+++ b/camera/ndk/include/camera/NdkCameraMetadataTags.h
@@ -40,8 +40,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 typedef enum acamera_metadata_section {
     ACAMERA_COLOR_CORRECTION,
     ACAMERA_CONTROL,
@@ -479,11 +477,26 @@
      * Otherwise will always be present.</p>
      * <p>The maximum number of regions supported by the device is determined by the value
      * of android.control.maxRegionsAe.</p>
-     * <p>The coordinate system is based on the active pixel array,
-     * with (0,0) being the top-left pixel in the active pixel array, and
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
+     * the top-left pixel in the active pixel array, and
      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
-     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the
-     * bottom-right pixel in the active pixel array.</p>
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
+     * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
+     * pixel in the pre-correction active pixel array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the active array, and
+     * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
      * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
      * for every pixel in the area. This means that a large metering area
      * with the same weight as a smaller area will have more effect in
@@ -504,8 +517,10 @@
      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
      * ymax.</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SCALER_CROP_REGION
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_CONTROL_AE_REGIONS =                                // int32[5*area_count]
             ACAMERA_CONTROL_START + 4,
@@ -641,11 +656,26 @@
      * Otherwise will always be present.</p>
      * <p>The maximum number of focus areas supported by the device is determined by the value
      * of android.control.maxRegionsAf.</p>
-     * <p>The coordinate system is based on the active pixel array,
-     * with (0,0) being the top-left pixel in the active pixel array, and
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
+     * the top-left pixel in the active pixel array, and
      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
-     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the
-     * bottom-right pixel in the active pixel array.</p>
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
+     * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
+     * pixel in the pre-correction active pixel array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the active array, and
+     * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
      * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
      * for every pixel in the area. This means that a large metering area
      * with the same weight as a smaller area will have more effect in
@@ -667,8 +697,10 @@
      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
      * ymax.</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SCALER_CROP_REGION
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_CONTROL_AF_REGIONS =                                // int32[5*area_count]
             ACAMERA_CONTROL_START + 8,
@@ -800,11 +832,26 @@
      * Otherwise will always be present.</p>
      * <p>The maximum number of regions supported by the device is determined by the value
      * of android.control.maxRegionsAwb.</p>
-     * <p>The coordinate system is based on the active pixel array,
-     * with (0,0) being the top-left pixel in the active pixel array, and
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
+     * the top-left pixel in the active pixel array, and
      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
-     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the
-     * bottom-right pixel in the active pixel array.</p>
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
+     * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
+     * pixel in the pre-correction active pixel array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the active array, and
+     * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
+     * active pixel array.</p>
      * <p>The weight must range from 0 to 1000, and represents a weight
      * for every pixel in the area. This means that a large metering area
      * with the same weight as a smaller area will have more effect in
@@ -825,8 +872,10 @@
      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
      * ymax.</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SCALER_CROP_REGION
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_CONTROL_AWB_REGIONS =                               // int32[5*area_count]
             ACAMERA_CONTROL_START + 12,
@@ -2979,9 +3028,17 @@
      * </ul></p>
      *
      * <p>This control can be used to implement digital zoom.</p>
-     * <p>The crop region coordinate system is based off
-     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being the
-     * top-left corner of the sensor active array.</p>
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
+     * the top-left pixel of the active array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
      * <p>Output streams use this rectangle to produce their output,
      * cropping to a smaller region if necessary to maintain the
      * stream's aspect ratio, then scaling the sensor input to
@@ -3000,18 +3057,26 @@
      * outputs will crop horizontally (pillarbox), and 16:9
      * streams will match exactly. These additional crops will
      * be centered within the crop region.</p>
-     * <p>The width and height of the crop region cannot
-     * be set to be smaller than
+     * <p>If the coordinate system is android.sensor.info.activeArraysSize, the width and height
+     * of the crop region cannot be set to be smaller than
      * <code>floor( activeArraySize.width / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code> and
      * <code>floor( activeArraySize.height / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>, respectively.</p>
+     * <p>If the coordinate system is ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, the width
+     * and height of the crop region cannot be set to be smaller than
+     * <code>floor( preCorrectionActiveArraySize.width / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>
+     * and
+     * <code>floor( preCorrectionActiveArraySize.height / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>,
+     * respectively.</p>
      * <p>The camera device may adjust the crop region to account
      * for rounding and other hardware requirements; the final
      * crop region used will be included in the output capture
      * result.</p>
      * <p>The data representation is int[4], which maps to (left, top, width, height).</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_SCALER_CROP_REGION =                                // int32[4]
             ACAMERA_SCALER_START,
@@ -3977,12 +4042,24 @@
      * ACAMERA_SCALER_CROP_REGION, is defined relative to the active array rectangle given in
      * this field, with <code>(0, 0)</code> being the top-left of this rectangle.</p>
      * <p>The active array may be smaller than the full pixel array, since the full array may
-     * include black calibration pixels or other inactive regions, and geometric correction
-     * resulting in scaling or cropping may have been applied.</p>
+     * include black calibration pixels or other inactive regions.</p>
+     * <p>For devices that do not support ACAMERA_DISTORTION_CORRECTION_MODE control, the active
+     * array must be the same as ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.</p>
+     * <p>For devices that support ACAMERA_DISTORTION_CORRECTION_MODE control, the active array must
+     * be enclosed by ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE. The difference between
+     * pre-correction active array and active array accounts for scaling or cropping caused
+     * by lens geometric distortion correction.</p>
+     * <p>In general, application should always refer to active array size for controls like
+     * metering regions or crop region. Two exceptions are when the application is dealing with
+     * RAW image buffers (RAW_SENSOR, RAW10, RAW12 etc), or when application explicitly set
+     * ACAMERA_DISTORTION_CORRECTION_MODE to OFF. In these cases, application should refer
+     * to ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.</p>
      * <p>The data representation is <code>int[4]</code>, which maps to <code>(left, top, width, height)</code>.</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SCALER_CROP_REGION
      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE =                     // int32[4]
             ACAMERA_SENSOR_INFO_START,
@@ -4224,9 +4301,9 @@
      * <ol>
      * <li>ACAMERA_LENS_DISTORTION.</li>
      * </ol>
-     * <p>If all of the geometric distortion fields are no-ops, this rectangle will be the same
-     * as the post-distortion-corrected rectangle given in
-     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
+     * <p>If the camera device doesn't support geometric distortion correction, or all of the
+     * geometric distortion fields are no-ops, this rectangle will be the same as the
+     * post-distortion-corrected rectangle given in ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
      * <p>This rectangle is defined relative to the full pixel array; (0,0) is the top-left of
      * the full pixel array, and the size of the full pixel array is given by
      * ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE.</p>
@@ -4372,11 +4449,22 @@
      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
      * </ul></p>
      *
-     * <p>The coordinate system is that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
+     * the top-left pixel of the active array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
      * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE == FULL</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
      */
     ACAMERA_STATISTICS_FACE_LANDMARKS =                         // int32[n*6]
@@ -4392,12 +4480,23 @@
      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
      * </ul></p>
      *
-     * <p>The coordinate system is that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
+     * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
+     * the top-left pixel of the active array.</p>
+     * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
+     * system depends on the mode being set.
+     * When the distortion correction mode is OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
+     * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
+     * When the distortion correction mode is not OFF, the coordinate system follows
+     * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
      * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE != OFF
-     * The data representation is <code>int[4]</code>, which maps to <code>(left, top, width, height)</code>.</p>
+     * The data representation is <code>int[4]</code>, which maps to <code>(left, top, right, bottom)</code>.</p>
      *
+     * @see ACAMERA_DISTORTION_CORRECTION_MODE
      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
      */
     ACAMERA_STATISTICS_FACE_RECTANGLES =                        // int32[n*4]
@@ -4993,12 +5092,26 @@
      * the following code snippet can be used:</p>
      * <pre><code>// Returns true if the device supports the required hardware level, or better.
      * boolean isHardwareLevelSupported(CameraCharacteristics c, int requiredLevel) {
+     *     final int[] sortedHwLevels = {
+     *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY,
+     *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL,
+     *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED,
+     *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL,
+     *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_3
+     *     };
      *     int deviceLevel = c.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
-     *     if (deviceLevel == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
-     *         return requiredLevel == deviceLevel;
+     *     if (requiredLevel == deviceLevel) {
+     *         return true;
      *     }
-     *     // deviceLevel is not LEGACY, can use numerical sort
-     *     return requiredLevel &lt;= deviceLevel;
+     *
+     *     for (int sortedlevel : sortedHwLevels) {
+     *         if (sortedlevel == requiredLevel) {
+     *             return true;
+     *         } else if (sortedlevel == deviceLevel) {
+     *             return false;
+     *         }
+     *     }
+     *     return false; // Should never reach here
      * }
      * </code></pre>
      * <p>At a high level, the levels are:</p>
@@ -5012,6 +5125,8 @@
      *   post-processing settings, and image capture at a high rate.</li>
      * <li><code>LEVEL_3</code> devices additionally support YUV reprocessing and RAW image capture, along
      *   with additional output stream configurations.</li>
+     * <li><code>EXTERNAL</code> devices are similar to <code>LIMITED</code> devices with exceptions like some sensor or
+     *   lens information not reorted or less stable framerates.</li>
      * </ul>
      * <p>See the individual level enums for full descriptions of the supported capabilities.  The
      * ACAMERA_REQUEST_AVAILABLE_CAPABILITIES entry describes the device's capabilities at a
@@ -5315,18 +5430,18 @@
      * any correction at all would slow down capture rate.  Every output stream will have a
      * similar amount of enhancement applied.</p>
      * <p>The correction only applies to processed outputs such as YUV, JPEG, or DEPTH16; it is not
-     * applied to any RAW output.  Metadata coordinates such as face rectangles or metering
+     * applied to any RAW output. Metadata coordinates such as face rectangles or metering
      * regions are also not affected by correction.</p>
-     * <p>Applications enabling distortion correction need to pay extra attention when converting
-     * image coordinates between corrected output buffers and the sensor array. For example, if
-     * the app supports tap-to-focus and enables correction, it then has to apply the distortion
-     * model described in ACAMERA_LENS_DISTORTION to the image buffer tap coordinates to properly
-     * calculate the tap position on the sensor active array to be used with
-     * ACAMERA_CONTROL_AF_REGIONS. The same applies in reverse to detected face rectangles if
-     * they need to be drawn on top of the corrected output buffers.</p>
+     * <p>This control will be on by default on devices that support this control. Applications
+     * disabling distortion correction need to pay extra attention with the coordinate system of
+     * metering regions, crop region, and face rectangles. When distortion correction is OFF,
+     * metadata coordinates follow the coordinate system of
+     * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE. When distortion is not OFF, metadata
+     * coordinates follow the coordinate system of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
      *
-     * @see ACAMERA_CONTROL_AF_REGIONS
      * @see ACAMERA_LENS_DISTORTION
+     * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
+     * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
      */
     ACAMERA_DISTORTION_CORRECTION_MODE =                        // byte (acamera_metadata_enum_android_distortion_correction_mode_t)
             ACAMERA_DISTORTION_CORRECTION_START,
@@ -7779,9 +7894,6 @@
 
 } acamera_metadata_enum_android_distortion_correction_mode_t;
 
-
-#endif /* __ANDROID_API__ >= 24 */
-
 __END_DECLS
 
 #endif /* _NDK_CAMERA_METADATA_TAGS_H */
diff --git a/camera/ndk/include/camera/NdkCaptureRequest.h b/camera/ndk/include/camera/NdkCaptureRequest.h
index 4961ce3..2fb5d12 100644
--- a/camera/ndk/include/camera/NdkCaptureRequest.h
+++ b/camera/ndk/include/camera/NdkCaptureRequest.h
@@ -44,8 +44,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 24
-
 // Container for output targets
 typedef struct ACameraOutputTargets ACameraOutputTargets;
 
@@ -101,7 +99,8 @@
  *
  * @see ACaptureRequest_addTarget
  */
-camera_status_t ACameraOutputTarget_create(ANativeWindow* window, ACameraOutputTarget** output);
+camera_status_t ACameraOutputTarget_create(ANativeWindow* window,
+        ACameraOutputTarget** output) __INTRODUCED_IN(24);
 
 /**
  * Free a ACameraOutputTarget object.
@@ -110,7 +109,7 @@
  *
  * @see ACameraOutputTarget_create
  */
-void ACameraOutputTarget_free(ACameraOutputTarget* output);
+void ACameraOutputTarget_free(ACameraOutputTarget* output) __INTRODUCED_IN(24);
 
 /**
  * Add an {@link ACameraOutputTarget} object to {@link ACaptureRequest}.
@@ -123,7 +122,7 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request or output is NULL.</li></ul>
  */
 camera_status_t ACaptureRequest_addTarget(ACaptureRequest* request,
-        const ACameraOutputTarget* output);
+        const ACameraOutputTarget* output) __INTRODUCED_IN(24);
 
 /**
  * Remove an {@link ACameraOutputTarget} object from {@link ACaptureRequest}.
@@ -138,7 +137,7 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request or output is NULL.</li></ul>
  */
 camera_status_t ACaptureRequest_removeTarget(ACaptureRequest* request,
-        const ACameraOutputTarget* output);
+        const ACameraOutputTarget* output) __INTRODUCED_IN(24);
 
 /**
  * Get a metadata entry from input {@link ACaptureRequest}.
@@ -158,7 +157,7 @@
  *             entry of input tag value.</li></ul>
  */
 camera_status_t ACaptureRequest_getConstEntry(
-        const ACaptureRequest* request, uint32_t tag, ACameraMetadata_const_entry* entry);
+        const ACaptureRequest* request, uint32_t tag, ACameraMetadata_const_entry* entry) __INTRODUCED_IN(24);
 
 /*
  * List all the entry tags in input {@link ACaptureRequest}.
@@ -179,7 +178,7 @@
  *         <li>{@link ACAMERA_ERROR_UNKNOWN} if the method fails for some other reasons.</li></ul>
  */
 camera_status_t ACaptureRequest_getAllTags(
-        const ACaptureRequest* request, /*out*/int32_t* numTags, /*out*/const uint32_t** tags);
+        const ACaptureRequest* request, /*out*/int32_t* numTags, /*out*/const uint32_t** tags) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with unsigned 8 bits data type.
@@ -198,7 +197,7 @@
  *             the tag is not controllable by application.</li></ul>
  */
 camera_status_t ACaptureRequest_setEntry_u8(
-        ACaptureRequest* request, uint32_t tag, uint32_t count, const uint8_t* data);
+        ACaptureRequest* request, uint32_t tag, uint32_t count, const uint8_t* data) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with signed 32 bits data type.
@@ -217,7 +216,7 @@
  *             the tag is not controllable by application.</li></ul>
  */
 camera_status_t ACaptureRequest_setEntry_i32(
-        ACaptureRequest* request, uint32_t tag, uint32_t count, const int32_t* data);
+        ACaptureRequest* request, uint32_t tag, uint32_t count, const int32_t* data) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with float data type.
@@ -236,7 +235,7 @@
  *             the tag is not controllable by application.</li></ul>
  */
 camera_status_t ACaptureRequest_setEntry_float(
-        ACaptureRequest* request, uint32_t tag, uint32_t count, const float* data);
+        ACaptureRequest* request, uint32_t tag, uint32_t count, const float* data) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with signed 64 bits data type.
@@ -255,7 +254,7 @@
  *             the tag is not controllable by application.</li></ul>
  */
 camera_status_t ACaptureRequest_setEntry_i64(
-        ACaptureRequest* request, uint32_t tag, uint32_t count, const int64_t* data);
+        ACaptureRequest* request, uint32_t tag, uint32_t count, const int64_t* data) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with double data type.
@@ -274,7 +273,7 @@
  *             the tag is not controllable by application.</li></ul>
  */
 camera_status_t ACaptureRequest_setEntry_double(
-        ACaptureRequest* request, uint32_t tag, uint32_t count, const double* data);
+        ACaptureRequest* request, uint32_t tag, uint32_t count, const double* data) __INTRODUCED_IN(24);
 
 /**
  * Set/change a camera capture control entry with rational data type.
@@ -294,18 +293,14 @@
  */
 camera_status_t ACaptureRequest_setEntry_rational(
         ACaptureRequest* request, uint32_t tag, uint32_t count,
-        const ACameraMetadata_rational* data);
+        const ACameraMetadata_rational* data) __INTRODUCED_IN(24);
 
 /**
  * Free a {@link ACaptureRequest} structure.
  *
  * @param request the {@link ACaptureRequest} to be freed.
  */
-void ACaptureRequest_free(ACaptureRequest* request);
-
-#endif /* __ANDROID_API__ >= 24 */
-
-#if __ANDROID_API__ >= 28
+void ACaptureRequest_free(ACaptureRequest* request) __INTRODUCED_IN(24);
 
 /**
  * Associate an arbitrary user context pointer to the {@link ACaptureRequest}
@@ -325,7 +320,7 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request is NULL.</li></ul>
  */
 camera_status_t ACaptureRequest_setUserContext(
-        ACaptureRequest* request, void* context);
+        ACaptureRequest* request, void* context) __INTRODUCED_IN(28);
 
 /**
  * Get the user context pointer of the {@link ACaptureRequest}
@@ -341,7 +336,7 @@
  *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request is NULL.</li></ul>
  */
 camera_status_t ACaptureRequest_getUserContext(
-        const ACaptureRequest* request, /*out*/void** context);
+        const ACaptureRequest* request, /*out*/void** context) __INTRODUCED_IN(28);
 
 /**
  * Create a copy of input {@link ACaptureRequest}.
@@ -353,9 +348,7 @@
  *
  * @return a valid ACaptureRequest pointer or NULL if the input request cannot be copied.
  */
-ACaptureRequest* ACaptureRequest_copy(const ACaptureRequest* src);
-
-#endif /* __ANDROID_API__ >= 28 */
+ACaptureRequest* ACaptureRequest_copy(const ACaptureRequest* src) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/camera/ndk/libcamera2ndk.map.txt b/camera/ndk/libcamera2ndk.map.txt
index d179aa0..a29e96d 100644
--- a/camera/ndk/libcamera2ndk.map.txt
+++ b/camera/ndk/libcamera2ndk.map.txt
@@ -6,11 +6,11 @@
     ACameraCaptureSession_getDevice;
     ACameraCaptureSession_setRepeatingRequest;
     ACameraCaptureSession_stopRepeating;
-    ACameraCaptureSession_updateSharedOutput;
+    ACameraCaptureSession_updateSharedOutput; # introduced=28
     ACameraDevice_close;
     ACameraDevice_createCaptureRequest;
     ACameraDevice_createCaptureSession;
-    ACameraDevice_createCaptureSessionWithSessionParameters;
+    ACameraDevice_createCaptureSessionWithSessionParameters; # introduced=28
     ACameraDevice_getId;
     ACameraManager_create;
     ACameraManager_delete;
@@ -27,11 +27,11 @@
     ACameraOutputTarget_create;
     ACameraOutputTarget_free;
     ACaptureRequest_addTarget;
-    ACaptureRequest_copy;
+    ACaptureRequest_copy; # introduced=28
     ACaptureRequest_free;
     ACaptureRequest_getAllTags;
     ACaptureRequest_getConstEntry;
-    ACaptureRequest_getUserContext;
+    ACaptureRequest_getUserContext; # introduced=28
     ACaptureRequest_removeTarget;
     ACaptureRequest_setEntry_double;
     ACaptureRequest_setEntry_float;
@@ -39,15 +39,15 @@
     ACaptureRequest_setEntry_i64;
     ACaptureRequest_setEntry_rational;
     ACaptureRequest_setEntry_u8;
-    ACaptureRequest_setUserContext;
+    ACaptureRequest_setUserContext; # introduced=28
     ACaptureSessionOutputContainer_add;
     ACaptureSessionOutputContainer_create;
     ACaptureSessionOutputContainer_free;
     ACaptureSessionOutputContainer_remove;
     ACaptureSessionOutput_create;
-    ACaptureSessionSharedOutput_create;
-    ACaptureSessionSharedOutput_add;
-    ACaptureSessionSharedOutput_remove;
+    ACaptureSessionSharedOutput_create; # introduced=28
+    ACaptureSessionSharedOutput_add; # introduced=28
+    ACaptureSessionSharedOutput_remove; # introduced=28
     ACaptureSessionOutput_free;
   local:
     *;
diff --git a/media/libaaudio/include/aaudio/AAudio.h b/media/libaaudio/include/aaudio/AAudio.h
index 5b29419..1493b26 100644
--- a/media/libaaudio/include/aaudio/AAudio.h
+++ b/media/libaaudio/include/aaudio/AAudio.h
@@ -423,7 +423,7 @@
  *
  * @return pointer to a text representation of an AAudio result code.
  */
-AAUDIO_API const char * AAudio_convertResultToText(aaudio_result_t returnCode);
+AAUDIO_API const char * AAudio_convertResultToText(aaudio_result_t returnCode) __INTRODUCED_IN(26);
 
 /**
  * The text is the ASCII symbol corresponding to the stream state,
@@ -433,7 +433,8 @@
  *
  * @return pointer to a text representation of an AAudio state.
  */
-AAUDIO_API const char * AAudio_convertStreamStateToText(aaudio_stream_state_t state);
+AAUDIO_API const char * AAudio_convertStreamStateToText(aaudio_stream_state_t state)
+        __INTRODUCED_IN(26);
 
 // ============================================================
 // StreamBuilder
@@ -451,7 +452,8 @@
  *
  * AAudioStreamBuilder_delete() must be called when you are done using the builder.
  */
-AAUDIO_API aaudio_result_t AAudio_createStreamBuilder(AAudioStreamBuilder** builder);
+AAUDIO_API aaudio_result_t AAudio_createStreamBuilder(AAudioStreamBuilder** builder)
+        __INTRODUCED_IN(26);
 
 /**
  * Request an audio device identified device using an ID.
@@ -464,7 +466,7 @@
  * @param deviceId device identifier or AAUDIO_UNSPECIFIED
  */
 AAUDIO_API void AAudioStreamBuilder_setDeviceId(AAudioStreamBuilder* builder,
-                                                     int32_t deviceId);
+                                                int32_t deviceId) __INTRODUCED_IN(26);
 
 /**
  * Request a sample rate in Hertz.
@@ -481,7 +483,7 @@
  * @param sampleRate frames per second. Common rates include 44100 and 48000 Hz.
  */
 AAUDIO_API void AAudioStreamBuilder_setSampleRate(AAudioStreamBuilder* builder,
-                                                       int32_t sampleRate);
+                                                  int32_t sampleRate) __INTRODUCED_IN(26);
 
 /**
  * Request a number of channels for the stream.
@@ -498,7 +500,7 @@
  * @param channelCount Number of channels desired.
  */
 AAUDIO_API void AAudioStreamBuilder_setChannelCount(AAudioStreamBuilder* builder,
-                                                   int32_t channelCount);
+                                                    int32_t channelCount) __INTRODUCED_IN(26);
 
 /**
  * Identical to AAudioStreamBuilder_setChannelCount().
@@ -507,7 +509,7 @@
  * @param samplesPerFrame Number of samples in a frame.
  */
 AAUDIO_API void AAudioStreamBuilder_setSamplesPerFrame(AAudioStreamBuilder* builder,
-                                                       int32_t samplesPerFrame);
+                                                       int32_t samplesPerFrame) __INTRODUCED_IN(26);
 
 /**
  * Request a sample data format, for example AAUDIO_FORMAT_PCM_I16.
@@ -524,7 +526,7 @@
  * @param format common formats are AAUDIO_FORMAT_PCM_FLOAT and AAUDIO_FORMAT_PCM_I16.
  */
 AAUDIO_API void AAudioStreamBuilder_setFormat(AAudioStreamBuilder* builder,
-                                                   aaudio_format_t format);
+                                              aaudio_format_t format) __INTRODUCED_IN(26);
 
 /**
  * Request a mode for sharing the device.
@@ -538,7 +540,7 @@
  * @param sharingMode AAUDIO_SHARING_MODE_SHARED or AAUDIO_SHARING_MODE_EXCLUSIVE
  */
 AAUDIO_API void AAudioStreamBuilder_setSharingMode(AAudioStreamBuilder* builder,
-                                                        aaudio_sharing_mode_t sharingMode);
+        aaudio_sharing_mode_t sharingMode) __INTRODUCED_IN(26);
 
 /**
  * Request the direction for a stream.
@@ -549,7 +551,7 @@
  * @param direction AAUDIO_DIRECTION_OUTPUT or AAUDIO_DIRECTION_INPUT
  */
 AAUDIO_API void AAudioStreamBuilder_setDirection(AAudioStreamBuilder* builder,
-                                                            aaudio_direction_t direction);
+        aaudio_direction_t direction) __INTRODUCED_IN(26);
 
 /**
  * Set the requested buffer capacity in frames.
@@ -561,7 +563,7 @@
  * @param numFrames the desired buffer capacity in frames or AAUDIO_UNSPECIFIED
  */
 AAUDIO_API void AAudioStreamBuilder_setBufferCapacityInFrames(AAudioStreamBuilder* builder,
-                                                                 int32_t numFrames);
+        int32_t numFrames) __INTRODUCED_IN(26);
 
 /**
  * Set the requested performance mode.
@@ -578,7 +580,7 @@
  * @param mode the desired performance mode, eg. AAUDIO_PERFORMANCE_MODE_LOW_LATENCY
  */
 AAUDIO_API void AAudioStreamBuilder_setPerformanceMode(AAudioStreamBuilder* builder,
-                                                aaudio_performance_mode_t mode);
+        aaudio_performance_mode_t mode) __INTRODUCED_IN(26);
 
 /**
  * Set the intended use case for the stream.
@@ -595,7 +597,7 @@
  * @param usage the desired usage, eg. AAUDIO_USAGE_GAME
  */
 AAUDIO_API void AAudioStreamBuilder_setUsage(AAudioStreamBuilder* builder,
-                                                       aaudio_usage_t usage);
+        aaudio_usage_t usage) __INTRODUCED_IN(28);
 
 /**
  * Set the type of audio data that the stream will carry.
@@ -612,7 +614,7 @@
  * @param contentType the type of audio data, eg. AAUDIO_CONTENT_TYPE_SPEECH
  */
 AAUDIO_API void AAudioStreamBuilder_setContentType(AAudioStreamBuilder* builder,
-                                             aaudio_content_type_t contentType);
+        aaudio_content_type_t contentType) __INTRODUCED_IN(28);
 
 /**
  * Set the input (capture) preset for the stream.
@@ -632,7 +634,7 @@
  * @param inputPreset the desired configuration for recording
  */
 AAUDIO_API void AAudioStreamBuilder_setInputPreset(AAudioStreamBuilder* builder,
-                                                   aaudio_input_preset_t inputPreset);
+        aaudio_input_preset_t inputPreset) __INTRODUCED_IN(28);
 
 /** Set the requested session ID.
  *
@@ -662,7 +664,7 @@
  * @param sessionId an allocated sessionID or AAUDIO_SESSION_ID_ALLOCATE
  */
 AAUDIO_API void AAudioStreamBuilder_setSessionId(AAudioStreamBuilder* builder,
-                                                aaudio_session_id_t sessionId);
+        aaudio_session_id_t sessionId) __INTRODUCED_IN(28);
 
 /**
  * Return one of these values from the data callback function.
@@ -760,8 +762,7 @@
  *          to the callback functions.
  */
 AAUDIO_API void AAudioStreamBuilder_setDataCallback(AAudioStreamBuilder* builder,
-                                                 AAudioStream_dataCallback callback,
-                                                 void *userData);
+        AAudioStream_dataCallback callback, void *userData) __INTRODUCED_IN(26);
 
 /**
  * Set the requested data callback buffer size in frames.
@@ -787,7 +788,7 @@
  * @param numFrames the desired buffer size in frames or AAUDIO_UNSPECIFIED
  */
 AAUDIO_API void AAudioStreamBuilder_setFramesPerDataCallback(AAudioStreamBuilder* builder,
-                                                             int32_t numFrames);
+                                                             int32_t numFrames) __INTRODUCED_IN(26);
 
 /**
  * Prototype for the callback function that is passed to
@@ -840,8 +841,7 @@
  *          to the callback functions.
  */
 AAUDIO_API void AAudioStreamBuilder_setErrorCallback(AAudioStreamBuilder* builder,
-                                                AAudioStream_errorCallback callback,
-                                                void *userData);
+        AAudioStream_errorCallback callback, void *userData) __INTRODUCED_IN(26);
 
 /**
  * Open a stream based on the options in the StreamBuilder.
@@ -854,7 +854,7 @@
  * @return AAUDIO_OK or a negative error.
  */
 AAUDIO_API aaudio_result_t  AAudioStreamBuilder_openStream(AAudioStreamBuilder* builder,
-                                                     AAudioStream** stream);
+        AAudioStream** stream) __INTRODUCED_IN(26);
 
 /**
  * Delete the resources associated with the StreamBuilder.
@@ -862,7 +862,8 @@
  * @param builder reference provided by AAudio_createStreamBuilder()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStreamBuilder_delete(AAudioStreamBuilder* builder);
+AAUDIO_API aaudio_result_t  AAudioStreamBuilder_delete(AAudioStreamBuilder* builder)
+    __INTRODUCED_IN(26);
 
 // ============================================================
 // Stream Control
@@ -874,7 +875,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStream_close(AAudioStream* stream);
+AAUDIO_API aaudio_result_t  AAudioStream_close(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Asynchronously request to start playing the stream. For output streams, one should
@@ -885,7 +886,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStream_requestStart(AAudioStream* stream);
+AAUDIO_API aaudio_result_t  AAudioStream_requestStart(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Asynchronous request for the stream to pause.
@@ -899,7 +900,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStream_requestPause(AAudioStream* stream);
+AAUDIO_API aaudio_result_t  AAudioStream_requestPause(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Asynchronous request for the stream to flush.
@@ -913,7 +914,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStream_requestFlush(AAudioStream* stream);
+AAUDIO_API aaudio_result_t  AAudioStream_requestFlush(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Asynchronous request for the stream to stop.
@@ -923,7 +924,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return AAUDIO_OK or a negative error.
  */
-AAUDIO_API aaudio_result_t  AAudioStream_requestStop(AAudioStream* stream);
+AAUDIO_API aaudio_result_t  AAudioStream_requestStop(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Query the current state of the client, eg. AAUDIO_STREAM_STATE_PAUSING
@@ -935,7 +936,7 @@
  *
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  */
-AAUDIO_API aaudio_stream_state_t AAudioStream_getState(AAudioStream* stream);
+AAUDIO_API aaudio_stream_state_t AAudioStream_getState(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Wait until the current state no longer matches the input state.
@@ -960,9 +961,8 @@
  * @return AAUDIO_OK or a negative error.
  */
 AAUDIO_API aaudio_result_t AAudioStream_waitForStateChange(AAudioStream* stream,
-                                            aaudio_stream_state_t inputState,
-                                            aaudio_stream_state_t *nextState,
-                                            int64_t timeoutNanoseconds);
+        aaudio_stream_state_t inputState, aaudio_stream_state_t *nextState,
+        int64_t timeoutNanoseconds) __INTRODUCED_IN(26);
 
 // ============================================================
 // Stream I/O
@@ -989,9 +989,7 @@
  * @return The number of frames actually read or a negative error.
  */
 AAUDIO_API aaudio_result_t AAudioStream_read(AAudioStream* stream,
-                               void *buffer,
-                               int32_t numFrames,
-                               int64_t timeoutNanoseconds);
+        void *buffer, int32_t numFrames, int64_t timeoutNanoseconds) __INTRODUCED_IN(26);
 
 /**
  * Write data to the stream.
@@ -1014,9 +1012,7 @@
  * @return The number of frames actually written or a negative error.
  */
 AAUDIO_API aaudio_result_t AAudioStream_write(AAudioStream* stream,
-                               const void *buffer,
-                               int32_t numFrames,
-                               int64_t timeoutNanoseconds);
+        const void *buffer, int32_t numFrames, int64_t timeoutNanoseconds) __INTRODUCED_IN(26);
 
 // ============================================================
 // Stream - queries
@@ -1039,7 +1035,7 @@
  * @return actual buffer size in frames or a negative error
  */
 AAUDIO_API aaudio_result_t AAudioStream_setBufferSizeInFrames(AAudioStream* stream,
-                                                      int32_t numFrames);
+        int32_t numFrames) __INTRODUCED_IN(26);
 
 /**
  * Query the maximum number of frames that can be filled without blocking.
@@ -1047,7 +1043,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return buffer size in frames.
  */
-AAUDIO_API int32_t AAudioStream_getBufferSizeInFrames(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getBufferSizeInFrames(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Query the number of frames that the application should read or write at
@@ -1062,7 +1058,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return burst size
  */
-AAUDIO_API int32_t AAudioStream_getFramesPerBurst(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getFramesPerBurst(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Query maximum buffer capacity in frames.
@@ -1070,7 +1066,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return  buffer capacity in frames
  */
-AAUDIO_API int32_t AAudioStream_getBufferCapacityInFrames(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getBufferCapacityInFrames(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Query the size of the buffer that will be passed to the dataProc callback
@@ -1091,7 +1087,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return callback buffer size in frames or AAUDIO_UNSPECIFIED
  */
-AAUDIO_API int32_t AAudioStream_getFramesPerDataCallback(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getFramesPerDataCallback(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * An XRun is an Underrun or an Overrun.
@@ -1108,13 +1104,13 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return the underrun or overrun count
  */
-AAUDIO_API int32_t AAudioStream_getXRunCount(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getXRunCount(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return actual sample rate
  */
-AAUDIO_API int32_t AAudioStream_getSampleRate(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getSampleRate(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * A stream has one or more channels of data.
@@ -1123,7 +1119,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return actual number of channels
  */
-AAUDIO_API int32_t AAudioStream_getChannelCount(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getChannelCount(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Identical to AAudioStream_getChannelCount().
@@ -1131,39 +1127,41 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return actual number of samples frame
  */
-AAUDIO_API int32_t AAudioStream_getSamplesPerFrame(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getSamplesPerFrame(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return actual device ID
  */
-AAUDIO_API int32_t AAudioStream_getDeviceId(AAudioStream* stream);
+AAUDIO_API int32_t AAudioStream_getDeviceId(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return actual data format
  */
-AAUDIO_API aaudio_format_t AAudioStream_getFormat(AAudioStream* stream);
+AAUDIO_API aaudio_format_t AAudioStream_getFormat(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Provide actual sharing mode.
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return  actual sharing mode
  */
-AAUDIO_API aaudio_sharing_mode_t AAudioStream_getSharingMode(AAudioStream* stream);
+AAUDIO_API aaudio_sharing_mode_t AAudioStream_getSharingMode(AAudioStream* stream)
+        __INTRODUCED_IN(26);
 
 /**
  * Get the performance mode used by the stream.
  *
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  */
-AAUDIO_API aaudio_performance_mode_t AAudioStream_getPerformanceMode(AAudioStream* stream);
+AAUDIO_API aaudio_performance_mode_t AAudioStream_getPerformanceMode(AAudioStream* stream)
+        __INTRODUCED_IN(26);
 
 /**
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return direction
  */
-AAUDIO_API aaudio_direction_t AAudioStream_getDirection(AAudioStream* stream);
+AAUDIO_API aaudio_direction_t AAudioStream_getDirection(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Passes back the number of frames that have been written since the stream was created.
@@ -1176,7 +1174,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return frames written
  */
-AAUDIO_API int64_t AAudioStream_getFramesWritten(AAudioStream* stream);
+AAUDIO_API int64_t AAudioStream_getFramesWritten(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Passes back the number of frames that have been read since the stream was created.
@@ -1189,7 +1187,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return frames read
  */
-AAUDIO_API int64_t AAudioStream_getFramesRead(AAudioStream* stream);
+AAUDIO_API int64_t AAudioStream_getFramesRead(AAudioStream* stream) __INTRODUCED_IN(26);
 
 /**
  * Passes back the session ID associated with this stream.
@@ -1213,7 +1211,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return session ID or AAUDIO_SESSION_ID_NONE
  */
-AAUDIO_API aaudio_session_id_t AAudioStream_getSessionId(AAudioStream* stream);
+AAUDIO_API aaudio_session_id_t AAudioStream_getSessionId(AAudioStream* stream) __INTRODUCED_IN(28);
 
 /**
  * Passes back the time at which a particular frame was presented.
@@ -1238,9 +1236,7 @@
  * @return AAUDIO_OK or a negative error
  */
 AAUDIO_API aaudio_result_t AAudioStream_getTimestamp(AAudioStream* stream,
-                                      clockid_t clockid,
-                                      int64_t *framePosition,
-                                      int64_t *timeNanoseconds);
+        clockid_t clockid, int64_t *framePosition, int64_t *timeNanoseconds) __INTRODUCED_IN(26);
 
 /**
  * Return the use case for the stream.
@@ -1250,7 +1246,7 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return frames read
  */
-AAUDIO_API aaudio_usage_t AAudioStream_getUsage(AAudioStream* stream);
+AAUDIO_API aaudio_usage_t AAudioStream_getUsage(AAudioStream* stream) __INTRODUCED_IN(28);
 
 /**
  * Return the content type for the stream.
@@ -1260,7 +1256,8 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return content type, for example AAUDIO_CONTENT_TYPE_MUSIC
  */
-AAUDIO_API aaudio_content_type_t AAudioStream_getContentType(AAudioStream* stream);
+AAUDIO_API aaudio_content_type_t AAudioStream_getContentType(AAudioStream* stream)
+        __INTRODUCED_IN(28);
 
 /**
  * Return the input preset for the stream.
@@ -1270,7 +1267,8 @@
  * @param stream reference provided by AAudioStreamBuilder_openStream()
  * @return input preset, for example AAUDIO_INPUT_PRESET_CAMCORDER
  */
-AAUDIO_API aaudio_input_preset_t AAudioStream_getInputPreset(AAudioStream* stream);
+AAUDIO_API aaudio_input_preset_t AAudioStream_getInputPreset(AAudioStream* stream)
+        __INTRODUCED_IN(28);
 
 #ifdef __cplusplus
 }
diff --git a/media/ndk/include/media/NdkImage.h b/media/ndk/include/media/NdkImage.h
index 19df760..38e12e3 100644
--- a/media/ndk/include/media/NdkImage.h
+++ b/media/ndk/include/media/NdkImage.h
@@ -516,8 +516,6 @@
     int32_t bottom;
 } AImageCropRect;
 
-#if __ANDROID_API__ >= 24
-
 /**
  * Return the image back the the system and delete the AImage object from memory.
  *
@@ -529,7 +527,7 @@
  *
  * @param image The {@link AImage} to be deleted.
  */
-void AImage_delete(AImage* image);
+void AImage_delete(AImage* image) __INTRODUCED_IN(24);
 
 /**
  * Query the width of the input {@link AImage}.
@@ -543,7 +541,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getWidth(const AImage* image, /*out*/int32_t* width);
+media_status_t AImage_getWidth(const AImage* image, /*out*/int32_t* width) __INTRODUCED_IN(24);
 
 /**
  * Query the height of the input {@link AImage}.
@@ -557,7 +555,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getHeight(const AImage* image, /*out*/int32_t* height);
+media_status_t AImage_getHeight(const AImage* image, /*out*/int32_t* height) __INTRODUCED_IN(24);
 
 /**
  * Query the format of the input {@link AImage}.
@@ -573,7 +571,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getFormat(const AImage* image, /*out*/int32_t* format);
+media_status_t AImage_getFormat(const AImage* image, /*out*/int32_t* format) __INTRODUCED_IN(24);
 
 /**
  * Query the cropped rectangle of the input {@link AImage}.
@@ -590,7 +588,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getCropRect(const AImage* image, /*out*/AImageCropRect* rect);
+media_status_t AImage_getCropRect(const AImage* image, /*out*/AImageCropRect* rect) __INTRODUCED_IN(24);
 
 /**
  * Query the timestamp of the input {@link AImage}.
@@ -614,7 +612,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getTimestamp(const AImage* image, /*out*/int64_t* timestampNs);
+media_status_t AImage_getTimestamp(const AImage* image, /*out*/int64_t* timestampNs) __INTRODUCED_IN(24);
 
 /**
  * Query the number of planes of the input {@link AImage}.
@@ -632,7 +630,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_OBJECT} if the {@link AImageReader} generated this
  *                 image has been deleted.</li></ul>
  */
-media_status_t AImage_getNumberOfPlanes(const AImage* image, /*out*/int32_t* numPlanes);
+media_status_t AImage_getNumberOfPlanes(const AImage* image, /*out*/int32_t* numPlanes) __INTRODUCED_IN(24);
 
 /**
  * Query the pixel stride of the input {@link AImage}.
@@ -660,7 +658,7 @@
  *                 for CPU access.</li></ul>
  */
 media_status_t AImage_getPlanePixelStride(
-        const AImage* image, int planeIdx, /*out*/int32_t* pixelStride);
+        const AImage* image, int planeIdx, /*out*/int32_t* pixelStride) __INTRODUCED_IN(24);
 
 /**
  * Query the row stride of the input {@link AImage}.
@@ -687,7 +685,7 @@
  *                 for CPU access.</li></ul>
  */
 media_status_t AImage_getPlaneRowStride(
-        const AImage* image, int planeIdx, /*out*/int32_t* rowStride);
+        const AImage* image, int planeIdx, /*out*/int32_t* rowStride) __INTRODUCED_IN(24);
 
 /**
  * Get the data pointer of the input image for direct application access.
@@ -712,11 +710,7 @@
  */
 media_status_t AImage_getPlaneData(
         const AImage* image, int planeIdx,
-        /*out*/uint8_t** data, /*out*/int* dataLength);
-
-#endif /* __ANDROID_API__ >= 24 */
-
-#if __ANDROID_API__ >= 26
+        /*out*/uint8_t** data, /*out*/int* dataLength) __INTRODUCED_IN(24);
 
 /**
  * Return the image back the the system and delete the AImage object from memory asynchronously.
@@ -732,7 +726,7 @@
  *
  * @see sync.h
  */
-void AImage_deleteAsync(AImage* image, int releaseFenceFd);
+void AImage_deleteAsync(AImage* image, int releaseFenceFd) __INTRODUCED_IN(26);
 
 /**
  * Get the hardware buffer handle of the input image intended for GPU and/or hardware access.
@@ -760,9 +754,7 @@
  *
  * @see AImageReader_ImageCallback
  */
-media_status_t AImage_getHardwareBuffer(const AImage* image, /*out*/AHardwareBuffer** buffer);
-
-#endif /* __ANDROID_API__ >= 26 */
+media_status_t AImage_getHardwareBuffer(const AImage* image, /*out*/AHardwareBuffer** buffer) __INTRODUCED_IN(26);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkImageReader.h b/media/ndk/include/media/NdkImageReader.h
index 571410b..eb1a44a 100644
--- a/media/ndk/include/media/NdkImageReader.h
+++ b/media/ndk/include/media/NdkImageReader.h
@@ -50,8 +50,6 @@
  */
 typedef struct AImageReader AImageReader;
 
-#if __ANDROID_API__ >= 24
-
 /**
  * Create a new reader for images of the desired size and format.
  *
@@ -88,7 +86,7 @@
  */
 media_status_t AImageReader_new(
         int32_t width, int32_t height, int32_t format, int32_t maxImages,
-        /*out*/AImageReader** reader);
+        /*out*/AImageReader** reader) __INTRODUCED_IN(24);
 
 /**
  * Delete an {@link AImageReader} and return all images generated by this reader to system.
@@ -100,7 +98,7 @@
  *
  * @param reader The image reader to be deleted.
  */
-void AImageReader_delete(AImageReader* reader);
+void AImageReader_delete(AImageReader* reader) __INTRODUCED_IN(24);
 
 /**
  * Get a {@link ANativeWindow} that can be used to produce {@link AImage} for this image reader.
@@ -114,7 +112,7 @@
  *         <li>{@link AMEDIA_OK} if the method call succeeds.</li>
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader or window is NULL.</li></ul>
  */
-media_status_t AImageReader_getWindow(AImageReader* reader, /*out*/ANativeWindow** window);
+media_status_t AImageReader_getWindow(AImageReader* reader, /*out*/ANativeWindow** window) __INTRODUCED_IN(24);
 
 /**
  * Query the default width of the {@link AImage} generated by this reader, in pixels.
@@ -130,7 +128,7 @@
  *         <li>{@link AMEDIA_OK} if the method call succeeds.</li>
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader or width is NULL.</li></ul>
  */
-media_status_t AImageReader_getWidth(const AImageReader* reader, /*out*/int32_t* width);
+media_status_t AImageReader_getWidth(const AImageReader* reader, /*out*/int32_t* width) __INTRODUCED_IN(24);
 
 /**
  * Query the default height of the {@link AImage} generated by this reader, in pixels.
@@ -146,7 +144,7 @@
  *         <li>{@link AMEDIA_OK} if the method call succeeds.</li>
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader or height is NULL.</li></ul>
  */
-media_status_t AImageReader_getHeight(const AImageReader* reader, /*out*/int32_t* height);
+media_status_t AImageReader_getHeight(const AImageReader* reader, /*out*/int32_t* height) __INTRODUCED_IN(24);
 
 /**
  * Query the format of the {@link AImage} generated by this reader.
@@ -159,7 +157,7 @@
  *         <li>{@link AMEDIA_OK} if the method call succeeds.</li>
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader or format is NULL.</li></ul>
  */
-media_status_t AImageReader_getFormat(const AImageReader* reader, /*out*/int32_t* format);
+media_status_t AImageReader_getFormat(const AImageReader* reader, /*out*/int32_t* format) __INTRODUCED_IN(24);
 
 /**
  * Query the maximum number of concurrently acquired {@link AImage}s of this reader.
@@ -172,7 +170,7 @@
  *         <li>{@link AMEDIA_OK} if the method call succeeds.</li>
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader or maxImages is NULL.</li></ul>
  */
-media_status_t AImageReader_getMaxImages(const AImageReader* reader, /*out*/int32_t* maxImages);
+media_status_t AImageReader_getMaxImages(const AImageReader* reader, /*out*/int32_t* maxImages) __INTRODUCED_IN(24);
 
 /**
  * Acquire the next {@link AImage} from the image reader's queue.
@@ -208,7 +206,7 @@
  *
  * @see AImageReader_acquireLatestImage
  */
-media_status_t AImageReader_acquireNextImage(AImageReader* reader, /*out*/AImage** image);
+media_status_t AImageReader_acquireNextImage(AImageReader* reader, /*out*/AImage** image) __INTRODUCED_IN(24);
 
 /**
 
@@ -252,7 +250,7 @@
  *
  * @see AImageReader_acquireNextImage
  */
-media_status_t AImageReader_acquireLatestImage(AImageReader* reader, /*out*/AImage** image);
+media_status_t AImageReader_acquireLatestImage(AImageReader* reader, /*out*/AImage** image) __INTRODUCED_IN(24);
 
 
 /**
@@ -296,11 +294,7 @@
  *         <li>{@link AMEDIA_ERROR_INVALID_PARAMETER} if reader is NULL.</li></ul>
  */
 media_status_t AImageReader_setImageListener(
-        AImageReader* reader, AImageReader_ImageListener* listener);
-
-#endif /* __ANDROID_API__ >= 24 */
-
-#if __ANDROID_API__ >= 26
+        AImageReader* reader, AImageReader_ImageListener* listener) __INTRODUCED_IN(24);
 
 /**
  * AImageReader constructor similar to {@link AImageReader_new} that takes an additional parameter
@@ -365,7 +359,7 @@
  */
 media_status_t AImageReader_newWithUsage(
         int32_t width, int32_t height, int32_t format, uint64_t usage, int32_t maxImages,
-        /*out*/ AImageReader** reader);
+        /*out*/ AImageReader** reader) __INTRODUCED_IN(26);
 
 /**
  * Acquire the next {@link AImage} from the image reader's queue asynchronously.
@@ -384,7 +378,7 @@
  * @see sync_get_fence_info
  */
 media_status_t AImageReader_acquireNextImageAsync(
-        AImageReader* reader, /*out*/AImage** image, /*out*/int* acquireFenceFd);
+        AImageReader* reader, /*out*/AImage** image, /*out*/int* acquireFenceFd) __INTRODUCED_IN(26);
 
 /**
  * Acquire the latest {@link AImage} from the image reader's queue asynchronously, dropping older
@@ -404,7 +398,7 @@
  * @see sync_get_fence_info
  */
 media_status_t AImageReader_acquireLatestImageAsync(
-        AImageReader* reader, /*out*/AImage** image, /*out*/int* acquireFenceFd);
+        AImageReader* reader, /*out*/AImage** image, /*out*/int* acquireFenceFd) __INTRODUCED_IN(26);
 /**
  * Signature of the callback which is called when {@link AImageReader} is about to remove a buffer.
  *
@@ -459,9 +453,7 @@
  * @see AImage_getHardwareBuffer
  */
 media_status_t AImageReader_setBufferRemovedListener(
-        AImageReader* reader, AImageReader_BufferRemovedListener* listener);
-
-#endif /* __ANDROID_API__ >= 26 */
+        AImageReader* reader, AImageReader_BufferRemovedListener* listener) __INTRODUCED_IN(26);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaCodec.h b/media/ndk/include/media/NdkMediaCodec.h
index c49582d..b329b39 100644
--- a/media/ndk/include/media/NdkMediaCodec.h
+++ b/media/ndk/include/media/NdkMediaCodec.h
@@ -121,30 +121,28 @@
       AMediaCodecOnAsyncError           onAsyncError;
 };
 
-#if __ANDROID_API__ >= 21
-
 /**
  * Create codec by name. Use this if you know the exact codec you want to use.
  * When configuring, you will need to specify whether to use the codec as an
  * encoder or decoder.
  */
-AMediaCodec* AMediaCodec_createCodecByName(const char *name);
+AMediaCodec* AMediaCodec_createCodecByName(const char *name) __INTRODUCED_IN(21);
 
 /**
  * Create codec by mime type. Most applications will use this, specifying a
  * mime type obtained from media extractor.
  */
-AMediaCodec* AMediaCodec_createDecoderByType(const char *mime_type);
+AMediaCodec* AMediaCodec_createDecoderByType(const char *mime_type) __INTRODUCED_IN(21);
 
 /**
  * Create encoder by name.
  */
-AMediaCodec* AMediaCodec_createEncoderByType(const char *mime_type);
+AMediaCodec* AMediaCodec_createEncoderByType(const char *mime_type) __INTRODUCED_IN(21);
 
 /**
  * delete the codec and free its resources
  */
-media_status_t AMediaCodec_delete(AMediaCodec*);
+media_status_t AMediaCodec_delete(AMediaCodec*) __INTRODUCED_IN(21);
 
 /**
  * Configure the codec. For decoding you would typically get the format from an extractor.
@@ -154,43 +152,43 @@
         const AMediaFormat* format,
         ANativeWindow* surface,
         AMediaCrypto *crypto,
-        uint32_t flags);
+        uint32_t flags) __INTRODUCED_IN(21);
 
 /**
  * Start the codec. A codec must be configured before it can be started, and must be started
  * before buffers can be sent to it.
  */
-media_status_t AMediaCodec_start(AMediaCodec*);
+media_status_t AMediaCodec_start(AMediaCodec*) __INTRODUCED_IN(21);
 
 /**
  * Stop the codec.
  */
-media_status_t AMediaCodec_stop(AMediaCodec*);
+media_status_t AMediaCodec_stop(AMediaCodec*) __INTRODUCED_IN(21);
 
 /*
  * Flush the codec's input and output. All indices previously returned from calls to
  * AMediaCodec_dequeueInputBuffer and AMediaCodec_dequeueOutputBuffer become invalid.
  */
-media_status_t AMediaCodec_flush(AMediaCodec*);
+media_status_t AMediaCodec_flush(AMediaCodec*) __INTRODUCED_IN(21);
 
 /**
  * Get an input buffer. The specified buffer index must have been previously obtained from
  * dequeueInputBuffer, and not yet queued.
  */
-uint8_t* AMediaCodec_getInputBuffer(AMediaCodec*, size_t idx, size_t *out_size);
+uint8_t* AMediaCodec_getInputBuffer(AMediaCodec*, size_t idx, size_t *out_size) __INTRODUCED_IN(21);
 
 /**
  * Get an output buffer. The specified buffer index must have been previously obtained from
  * dequeueOutputBuffer, and not yet queued.
  */
-uint8_t* AMediaCodec_getOutputBuffer(AMediaCodec*, size_t idx, size_t *out_size);
+uint8_t* AMediaCodec_getOutputBuffer(AMediaCodec*, size_t idx, size_t *out_size) __INTRODUCED_IN(21);
 
 /**
  * Get the index of the next available input buffer. An app will typically use this with
  * getInputBuffer() to get a pointer to the buffer, then copy the data to be encoded or decoded
  * into the buffer before passing it to the codec.
  */
-ssize_t AMediaCodec_dequeueInputBuffer(AMediaCodec*, int64_t timeoutUs);
+ssize_t AMediaCodec_dequeueInputBuffer(AMediaCodec*, int64_t timeoutUs) __INTRODUCED_IN(21);
 
 /*
  * __USE_FILE_OFFSET64 changes the type of off_t in LP32, which changes the ABI
@@ -221,7 +219,7 @@
  */
 media_status_t AMediaCodec_queueInputBuffer(AMediaCodec*, size_t idx,
                                             _off_t_compat offset, size_t size,
-                                            uint64_t time, uint32_t flags);
+                                            uint64_t time, uint32_t flags) __INTRODUCED_IN(21);
 
 /**
  * Send the specified buffer to the codec for processing.
@@ -229,7 +227,7 @@
 media_status_t AMediaCodec_queueSecureInputBuffer(AMediaCodec*, size_t idx,
                                                   _off_t_compat offset,
                                                   AMediaCodecCryptoInfo*,
-                                                  uint64_t time, uint32_t flags);
+                                                  uint64_t time, uint32_t flags) __INTRODUCED_IN(21);
 
 #undef _off_t_compat
 
@@ -237,21 +235,21 @@
  * Get the index of the next available buffer of processed data.
  */
 ssize_t AMediaCodec_dequeueOutputBuffer(AMediaCodec*, AMediaCodecBufferInfo *info,
-        int64_t timeoutUs);
-AMediaFormat* AMediaCodec_getOutputFormat(AMediaCodec*);
+        int64_t timeoutUs) __INTRODUCED_IN(21);
+AMediaFormat* AMediaCodec_getOutputFormat(AMediaCodec*) __INTRODUCED_IN(21);
 
 /**
  * Get format of the buffer. The specified buffer index must have been previously obtained from
  * dequeueOutputBuffer.
  */
-AMediaFormat* AMediaCodec_getBufferFormat(AMediaCodec*, size_t index);
+AMediaFormat* AMediaCodec_getBufferFormat(AMediaCodec*, size_t index) __INTRODUCED_IN(21);
 
 /**
  * If you are done with a buffer, use this call to return the buffer to
  * the codec. If you previously specified a surface when configuring this
  * video decoder you can optionally render the buffer.
  */
-media_status_t AMediaCodec_releaseOutputBuffer(AMediaCodec*, size_t idx, bool render);
+media_status_t AMediaCodec_releaseOutputBuffer(AMediaCodec*, size_t idx, bool render) __INTRODUCED_IN(21);
 
 /**
  * Dynamically sets the output surface of a codec.
@@ -263,7 +261,7 @@
  *
  * For more details, see the Java documentation for MediaCodec.setOutputSurface.
  */
-media_status_t AMediaCodec_setOutputSurface(AMediaCodec*, ANativeWindow* surface);
+media_status_t AMediaCodec_setOutputSurface(AMediaCodec*, ANativeWindow* surface) __INTRODUCED_IN(21);
 
 /**
  * If you are done with a buffer, use this call to update its surface timestamp
@@ -274,9 +272,7 @@
  * For more details, see the Java documentation for MediaCodec.releaseOutputBuffer.
  */
 media_status_t AMediaCodec_releaseOutputBufferAtTime(
-        AMediaCodec *mData, size_t idx, int64_t timestampNs);
-
-#if __ANDROID_API__ >= 26
+        AMediaCodec *mData, size_t idx, int64_t timestampNs) __INTRODUCED_IN(21);
 
 /**
  * Creates a Surface that can be used as the input to encoder, in place of input buffers
@@ -290,7 +286,7 @@
  * For more details, see the Java documentation for MediaCodec.createInputSurface.
  */
 media_status_t AMediaCodec_createInputSurface(
-        AMediaCodec *mData, ANativeWindow **surface);
+        AMediaCodec *mData, ANativeWindow **surface) __INTRODUCED_IN(26);
 
 /**
  * Creates a persistent Surface that can be used as the input to encoder
@@ -306,7 +302,7 @@
  * For more details, see the Java documentation for MediaCodec.createPersistentInputSurface.
  */
 media_status_t AMediaCodec_createPersistentInputSurface(
-        ANativeWindow **surface);
+        ANativeWindow **surface) __INTRODUCED_IN(26);
 
 /**
  * Set a persistent-surface that can be used as the input to encoder, in place of input buffers
@@ -319,7 +315,7 @@
  * For more details, see the Java documentation for MediaCodec.setInputSurface.
  */
 media_status_t AMediaCodec_setInputSurface(
-        AMediaCodec *mData, ANativeWindow *surface);
+        AMediaCodec *mData, ANativeWindow *surface) __INTRODUCED_IN(26);
 
 /**
  * Signal additional parameters to the codec instance.
@@ -330,7 +326,7 @@
  * NOTE: Some of these parameter changes may silently fail to apply.
  */
 media_status_t AMediaCodec_setParameters(
-        AMediaCodec *mData, const AMediaFormat* params);
+        AMediaCodec *mData, const AMediaFormat* params) __INTRODUCED_IN(26);
 
 /**
  * Signals end-of-stream on input. Equivalent to submitting an empty buffer with
@@ -346,23 +342,19 @@
  *
  * For more details, see the Java documentation for MediaCodec.signalEndOfInputStream.
  */
-media_status_t AMediaCodec_signalEndOfInputStream(AMediaCodec *mData);
-
-#endif /* __ANDROID_API__ >= 26 */
-
-#if __ANDROID_API__ >= 28
+media_status_t AMediaCodec_signalEndOfInputStream(AMediaCodec *mData) __INTRODUCED_IN(26);
 
 /**
  * Get the component name. If the codec was created by createDecoderByType
  * or createEncoderByType, what component is chosen is not known beforehand.
  * Caller shall call AMediaCodec_releaseName to free the returned pointer.
  */
-media_status_t AMediaCodec_getName(AMediaCodec*, char** out_name);
+media_status_t AMediaCodec_getName(AMediaCodec*, char** out_name) __INTRODUCED_IN(28);
 
 /**
  * Free the memory pointed by name which is returned by AMediaCodec_getName.
  */
-void AMediaCodec_releaseName(AMediaCodec*, char* name);
+void AMediaCodec_releaseName(AMediaCodec*, char* name) __INTRODUCED_IN(28);
 
 /**
  * Set an asynchronous callback for actionable AMediaCodec events.
@@ -386,34 +378,32 @@
 media_status_t AMediaCodec_setAsyncNotifyCallback(
         AMediaCodec*,
         AMediaCodecOnAsyncNotifyCallback callback,
-        void *userdata);
+        void *userdata) __INTRODUCED_IN(28);
 
 /**
  * Release the crypto if applicable.
  */
-media_status_t AMediaCodec_releaseCrypto(AMediaCodec*);
+media_status_t AMediaCodec_releaseCrypto(AMediaCodec*) __INTRODUCED_IN(28);
 
 /**
  * Call this after AMediaCodec_configure() returns successfully to get the input
  * format accepted by the codec. Do this to determine what optional configuration
  * parameters were supported by the codec.
  */
-AMediaFormat* AMediaCodec_getInputFormat(AMediaCodec*);
+AMediaFormat* AMediaCodec_getInputFormat(AMediaCodec*) __INTRODUCED_IN(28);
 
 /**
  * Returns true if the codec cannot proceed further, but can be recovered by stopping,
  * configuring, and starting again.
  */
-bool AMediaCodecActionCode_isRecoverable(int32_t actionCode);
+bool AMediaCodecActionCode_isRecoverable(int32_t actionCode) __INTRODUCED_IN(28);
 
 /**
  * Returns true if the codec error is a transient issue, perhaps due to
  * resource constraints, and that the method (or encoding/decoding) may be
  * retried at a later time.
  */
-bool AMediaCodecActionCode_isTransient(int32_t actionCode);
-
-#endif /* __ANDROID_API__ >= 28 */
+bool AMediaCodecActionCode_isTransient(int32_t actionCode) __INTRODUCED_IN(28);
 
 typedef enum {
     AMEDIACODECRYPTOINFO_MODE_CLEAR = 0,
@@ -447,53 +437,51 @@
         uint8_t iv[16],
         cryptoinfo_mode_t mode,
         size_t *clearbytes,
-        size_t *encryptedbytes);
+        size_t *encryptedbytes) __INTRODUCED_IN(21);
 
 /**
  * delete an AMediaCodecCryptoInfo created previously with AMediaCodecCryptoInfo_new, or
  * obtained from AMediaExtractor
  */
-media_status_t AMediaCodecCryptoInfo_delete(AMediaCodecCryptoInfo*);
+media_status_t AMediaCodecCryptoInfo_delete(AMediaCodecCryptoInfo*) __INTRODUCED_IN(21);
 
 /**
  * Set the crypto pattern on an AMediaCryptoInfo object
  */
 void AMediaCodecCryptoInfo_setPattern(
         AMediaCodecCryptoInfo *info,
-        cryptoinfo_pattern_t *pattern);
+        cryptoinfo_pattern_t *pattern) __INTRODUCED_IN(21);
 
 /**
  * The number of subsamples that make up the buffer's contents.
  */
-size_t AMediaCodecCryptoInfo_getNumSubSamples(AMediaCodecCryptoInfo*);
+size_t AMediaCodecCryptoInfo_getNumSubSamples(AMediaCodecCryptoInfo*) __INTRODUCED_IN(21);
 
 /**
  * A 16-byte opaque key
  */
-media_status_t AMediaCodecCryptoInfo_getKey(AMediaCodecCryptoInfo*, uint8_t *dst);
+media_status_t AMediaCodecCryptoInfo_getKey(AMediaCodecCryptoInfo*, uint8_t *dst) __INTRODUCED_IN(21);
 
 /**
  * A 16-byte initialization vector
  */
-media_status_t AMediaCodecCryptoInfo_getIV(AMediaCodecCryptoInfo*, uint8_t *dst);
+media_status_t AMediaCodecCryptoInfo_getIV(AMediaCodecCryptoInfo*, uint8_t *dst) __INTRODUCED_IN(21);
 
 /**
  * The type of encryption that has been applied,
  * one of AMEDIACODECRYPTOINFO_MODE_CLEAR or AMEDIACODECRYPTOINFO_MODE_AES_CTR.
  */
-cryptoinfo_mode_t AMediaCodecCryptoInfo_getMode(AMediaCodecCryptoInfo*);
+cryptoinfo_mode_t AMediaCodecCryptoInfo_getMode(AMediaCodecCryptoInfo*) __INTRODUCED_IN(21);
 
 /**
  * The number of leading unencrypted bytes in each subsample.
  */
-media_status_t AMediaCodecCryptoInfo_getClearBytes(AMediaCodecCryptoInfo*, size_t *dst);
+media_status_t AMediaCodecCryptoInfo_getClearBytes(AMediaCodecCryptoInfo*, size_t *dst) __INTRODUCED_IN(21);
 
 /**
  * The number of trailing encrypted bytes in each subsample.
  */
-media_status_t AMediaCodecCryptoInfo_getEncryptedBytes(AMediaCodecCryptoInfo*, size_t *dst);
-
-#endif /* __ANDROID_API__ >= 21 */
+media_status_t AMediaCodecCryptoInfo_getEncryptedBytes(AMediaCodecCryptoInfo*, size_t *dst) __INTRODUCED_IN(21);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaCrypto.h b/media/ndk/include/media/NdkMediaCrypto.h
index 6f2926e..b673adc 100644
--- a/media/ndk/include/media/NdkMediaCrypto.h
+++ b/media/ndk/include/media/NdkMediaCrypto.h
@@ -47,17 +47,13 @@
 
 typedef uint8_t AMediaUUID[16];
 
-#if __ANDROID_API__ >= 21
+bool AMediaCrypto_isCryptoSchemeSupported(const AMediaUUID uuid) __INTRODUCED_IN(21);
 
-bool AMediaCrypto_isCryptoSchemeSupported(const AMediaUUID uuid);
+bool AMediaCrypto_requiresSecureDecoderComponent(const char *mime) __INTRODUCED_IN(21);
 
-bool AMediaCrypto_requiresSecureDecoderComponent(const char *mime);
+AMediaCrypto* AMediaCrypto_new(const AMediaUUID uuid, const void *initData, size_t initDataSize) __INTRODUCED_IN(21);
 
-AMediaCrypto* AMediaCrypto_new(const AMediaUUID uuid, const void *initData, size_t initDataSize);
-
-void AMediaCrypto_delete(AMediaCrypto* crypto);
-
-#endif /* __ANDROID_API__ >= 21 */
+void AMediaCrypto_delete(AMediaCrypto* crypto) __INTRODUCED_IN(21);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaDataSource.h b/media/ndk/include/media/NdkMediaDataSource.h
index 9e2e351..3a4373c 100644
--- a/media/ndk/include/media/NdkMediaDataSource.h
+++ b/media/ndk/include/media/NdkMediaDataSource.h
@@ -38,8 +38,6 @@
 struct AMediaDataSource;
 typedef struct AMediaDataSource AMediaDataSource;
 
-#if __ANDROID_API__ >= 28
-
 /*
  * AMediaDataSource's callbacks will be invoked on an implementation-defined thread
  * or thread pool. No guarantees are provided about which thread(s) will be used for
@@ -84,19 +82,19 @@
  * Create new media data source. Returns NULL if memory allocation
  * for the new data source object fails.
  */
-AMediaDataSource* AMediaDataSource_new();
+AMediaDataSource* AMediaDataSource_new() __INTRODUCED_IN(28);
 
 /**
  * Delete a previously created media data source.
  */
-void AMediaDataSource_delete(AMediaDataSource*);
+void AMediaDataSource_delete(AMediaDataSource*) __INTRODUCED_IN(28);
 
 /**
  * Set an user provided opaque handle. This opaque handle is passed as
  * the first argument to the data source callbacks.
  */
 void AMediaDataSource_setUserdata(
-        AMediaDataSource*, void *userdata);
+        AMediaDataSource*, void *userdata) __INTRODUCED_IN(28);
 
 /**
  * Set a custom callback for supplying random access media data to the
@@ -111,7 +109,7 @@
  */
 void AMediaDataSource_setReadAt(
         AMediaDataSource*,
-        AMediaDataSourceReadAt);
+        AMediaDataSourceReadAt) __INTRODUCED_IN(28);
 
 /**
  * Set a custom callback for supplying the size of the data source to the
@@ -122,7 +120,7 @@
  */
 void AMediaDataSource_setGetSize(
         AMediaDataSource*,
-        AMediaDataSourceGetSize);
+        AMediaDataSourceGetSize) __INTRODUCED_IN(28);
 
 /**
  * Set a custom callback to receive signal from the NDK media framework
@@ -133,9 +131,7 @@
  */
 void AMediaDataSource_setClose(
         AMediaDataSource*,
-        AMediaDataSourceClose);
-
-#endif  /*__ANDROID_API__ >= 28 */
+        AMediaDataSourceClose) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaDrm.h b/media/ndk/include/media/NdkMediaDrm.h
index d45dc20..24c0d6d 100644
--- a/media/ndk/include/media/NdkMediaDrm.h
+++ b/media/ndk/include/media/NdkMediaDrm.h
@@ -87,8 +87,6 @@
 typedef void (*AMediaDrmEventListener)(AMediaDrm *, const AMediaDrmSessionId *sessionId,
         AMediaDrmEventType eventType, int extra, const uint8_t *data, size_t dataSize);
 
-#if __ANDROID_API__ >= 21
-
 /**
  * Query if the given scheme identified by its UUID is supported on this device, and
  * whether the drm plugin is able to handle the media container format specified by mimeType.
@@ -97,25 +95,27 @@
  * mimeType is the MIME type of the media container, e.g. "video/mp4".  If mimeType
  * is not known or required, it can be provided as NULL.
  */
-bool AMediaDrm_isCryptoSchemeSupported(const uint8_t *uuid, const char *mimeType);
+bool AMediaDrm_isCryptoSchemeSupported(const uint8_t *uuid,
+        const char *mimeType) __INTRODUCED_IN(21);
 
 /**
  * Create a MediaDrm instance from a UUID
  * uuid identifies the universal unique ID of the crypto scheme. uuid must be 16 bytes.
  */
-AMediaDrm* AMediaDrm_createByUUID(const uint8_t *uuid);
+AMediaDrm* AMediaDrm_createByUUID(const uint8_t *uuid) __INTRODUCED_IN(21);
 
 /**
  * Release a MediaDrm object
  */
-void AMediaDrm_release(AMediaDrm *);
+void AMediaDrm_release(AMediaDrm *) __INTRODUCED_IN(21);
 
 /**
  * Register a callback to be invoked when an event occurs
  *
  * listener is the callback that will be invoked on event
  */
-media_status_t AMediaDrm_setOnEventListener(AMediaDrm *, AMediaDrmEventListener listener);
+media_status_t AMediaDrm_setOnEventListener(AMediaDrm *,
+        AMediaDrmEventListener listener) __INTRODUCED_IN(21);
 
 /**
  * Open a new session with the MediaDrm object.  A session ID is returned.
@@ -123,13 +123,15 @@
  * returns MEDIADRM_NOT_PROVISIONED_ERROR if provisioning is needed
  * returns MEDIADRM_RESOURCE_BUSY_ERROR if required resources are in use
  */
-media_status_t AMediaDrm_openSession(AMediaDrm *, AMediaDrmSessionId *sessionId);
+media_status_t AMediaDrm_openSession(AMediaDrm *,
+        AMediaDrmSessionId *sessionId) __INTRODUCED_IN(21);
 
 /**
  * Close a session on the MediaDrm object that was previously opened
  * with AMediaDrm_openSession.
  */
-media_status_t AMediaDrm_closeSession(AMediaDrm *, const AMediaDrmSessionId *sessionId);
+media_status_t AMediaDrm_closeSession(AMediaDrm *,
+        const AMediaDrmSessionId *sessionId) __INTRODUCED_IN(21);
 
 typedef enum AMediaDrmKeyType {
     /**
@@ -208,7 +210,7 @@
 media_status_t AMediaDrm_getKeyRequest(AMediaDrm *, const AMediaDrmScope *scope,
         const uint8_t *init, size_t initSize, const char *mimeType, AMediaDrmKeyType keyType,
         const AMediaDrmKeyValue *optionalParameters, size_t numOptionalParameters,
-        const uint8_t **keyRequest, size_t *keyRequestSize);
+        const uint8_t **keyRequest, size_t *keyRequestSize) __INTRODUCED_IN(21);
 
 /**
  * A key response is received from the license server by the app, then it is
@@ -228,7 +230,8 @@
  */
 
 media_status_t AMediaDrm_provideKeyResponse(AMediaDrm *, const AMediaDrmScope *scope,
-        const uint8_t *response, size_t responseSize, AMediaDrmKeySetId *keySetId);
+        const uint8_t *response, size_t responseSize,
+        AMediaDrmKeySetId *keySetId) __INTRODUCED_IN(21);
 
 /**
  * Restore persisted offline keys into a new session.  keySetId identifies the
@@ -238,14 +241,15 @@
  * keySetId identifies the saved key set to restore
  */
 media_status_t AMediaDrm_restoreKeys(AMediaDrm *, const AMediaDrmSessionId *sessionId,
-        const AMediaDrmKeySetId *keySetId);
+        const AMediaDrmKeySetId *keySetId) __INTRODUCED_IN(21);
 
 /**
  * Remove the current keys from a session.
  *
  * keySetId identifies keys to remove
  */
-media_status_t AMediaDrm_removeKeys(AMediaDrm *, const AMediaDrmSessionId *keySetId);
+media_status_t AMediaDrm_removeKeys(AMediaDrm *,
+        const AMediaDrmSessionId *keySetId) __INTRODUCED_IN(21);
 
 /**
  * Request an informative description of the key status for the session.  The status is
@@ -261,7 +265,7 @@
  * and numPairs will be set to the number of pairs available.
  */
 media_status_t AMediaDrm_queryKeyStatus(AMediaDrm *, const AMediaDrmSessionId *sessionId,
-        AMediaDrmKeyValue *keyValuePairs, size_t *numPairs);
+        AMediaDrmKeyValue *keyValuePairs, size_t *numPairs) __INTRODUCED_IN(21);
 
 
 /**
@@ -280,7 +284,7 @@
  *       the next call to getProvisionRequest.
  */
 media_status_t AMediaDrm_getProvisionRequest(AMediaDrm *, const uint8_t **provisionRequest,
-        size_t *provisionRequestSize, const char **serverUrl);
+        size_t *provisionRequestSize, const char **serverUrl) __INTRODUCED_IN(21);
 
 
 /**
@@ -295,7 +299,7 @@
  * server rejected the request
  */
 media_status_t AMediaDrm_provideProvisionResponse(AMediaDrm *,
-        const uint8_t *response, size_t responseSize);
+        const uint8_t *response, size_t responseSize) __INTRODUCED_IN(21);
 
 
 /**
@@ -320,7 +324,7 @@
  * number required.
  */
 media_status_t AMediaDrm_getSecureStops(AMediaDrm *,
-        AMediaDrmSecureStop *secureStops, size_t *numSecureStops);
+        AMediaDrmSecureStop *secureStops, size_t *numSecureStops) __INTRODUCED_IN(21);
 
 /**
  * Process the SecureStop server response message ssRelease.  After authenticating
@@ -329,7 +333,7 @@
  * ssRelease is the server response indicating which secure stops to release
  */
 media_status_t AMediaDrm_releaseSecureStops(AMediaDrm *,
-        const AMediaDrmSecureStop *ssRelease);
+        const AMediaDrmSecureStop *ssRelease) __INTRODUCED_IN(21);
 
 /**
  * String property name: identifies the maker of the DRM engine plugin
@@ -362,7 +366,7 @@
  * will remain valid until the next call to AMediaDrm_getPropertyString.
  */
 media_status_t AMediaDrm_getPropertyString(AMediaDrm *, const char *propertyName,
-        const char **propertyValue);
+        const char **propertyValue) __INTRODUCED_IN(21);
 
 /**
  * Byte array property name: the device unique identifier is established during
@@ -377,19 +381,19 @@
  * will remain valid until the next call to AMediaDrm_getPropertyByteArray.
  */
 media_status_t AMediaDrm_getPropertyByteArray(AMediaDrm *, const char *propertyName,
-        AMediaDrmByteArray *propertyValue);
+        AMediaDrmByteArray *propertyValue) __INTRODUCED_IN(21);
 
 /**
  * Set a DRM engine plugin String property value.
  */
 media_status_t AMediaDrm_setPropertyString(AMediaDrm *, const char *propertyName,
-        const char *value);
+        const char *value) __INTRODUCED_IN(21);
 
 /**
  * Set a DRM engine plugin byte array property value.
  */
 media_status_t AMediaDrm_setPropertyByteArray(AMediaDrm *, const char *propertyName,
-        const uint8_t *value, size_t valueSize);
+        const uint8_t *value, size_t valueSize) __INTRODUCED_IN(21);
 
 /**
  * In addition to supporting decryption of DASH Common Encrypted Media, the
@@ -418,7 +422,7 @@
  */
 media_status_t AMediaDrm_encrypt(AMediaDrm *, const AMediaDrmSessionId *sessionId,
         const char *cipherAlgorithm, uint8_t *keyId, uint8_t *iv,
-        const uint8_t *input, uint8_t *output, size_t dataSize);
+        const uint8_t *input, uint8_t *output, size_t dataSize) __INTRODUCED_IN(21);
 
 /*
  * Decrypt the data referenced by input of length dataSize using algorithm specified
@@ -429,7 +433,7 @@
  */
 media_status_t AMediaDrm_decrypt(AMediaDrm *, const AMediaDrmSessionId *sessionId,
         const char *cipherAlgorithm, uint8_t *keyId, uint8_t *iv,
-        const uint8_t *input, uint8_t *output, size_t dataSize);
+        const uint8_t *input, uint8_t *output, size_t dataSize) __INTRODUCED_IN(21);
 
 /*
  * Generate a signature using the specified macAlgorithm over the message data
@@ -442,7 +446,7 @@
  */
 media_status_t AMediaDrm_sign(AMediaDrm *, const AMediaDrmSessionId *sessionId,
         const char *macAlgorithm, uint8_t *keyId, uint8_t *message, size_t messageSize,
-        uint8_t *signature, size_t *signatureSize);
+        uint8_t *signature, size_t *signatureSize) __INTRODUCED_IN(21);
 
 /*
  * Perform a signature verification using the specified macAlgorithm over the message
@@ -453,9 +457,7 @@
  */
 media_status_t AMediaDrm_verify(AMediaDrm *, const AMediaDrmSessionId *sessionId,
         const char *macAlgorithm, uint8_t *keyId, const uint8_t *message, size_t messageSize,
-        const uint8_t *signature, size_t signatureSize);
-
-#endif /* __ANDROID_API__ >= 21 */
+        const uint8_t *signature, size_t signatureSize) __INTRODUCED_IN(21);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaExtractor.h b/media/ndk/include/media/NdkMediaExtractor.h
index 3452cc9..9f60891 100644
--- a/media/ndk/include/media/NdkMediaExtractor.h
+++ b/media/ndk/include/media/NdkMediaExtractor.h
@@ -49,48 +49,44 @@
 struct AMediaExtractor;
 typedef struct AMediaExtractor AMediaExtractor;
 
-#if __ANDROID_API__ >= 21
-
 /**
  * Create new media extractor
  */
-AMediaExtractor* AMediaExtractor_new();
+AMediaExtractor* AMediaExtractor_new() __INTRODUCED_IN(21);
 
 /**
  * Delete a previously created media extractor
  */
-media_status_t AMediaExtractor_delete(AMediaExtractor*);
+media_status_t AMediaExtractor_delete(AMediaExtractor*) __INTRODUCED_IN(21);
 
 /**
  *  Set the file descriptor from which the extractor will read.
  */
 media_status_t AMediaExtractor_setDataSourceFd(AMediaExtractor*, int fd, off64_t offset,
-        off64_t length);
+        off64_t length) __INTRODUCED_IN(21);
 
 /**
  * Set the URI from which the extractor will read.
  */
-media_status_t AMediaExtractor_setDataSource(AMediaExtractor*, const char *location);
+media_status_t AMediaExtractor_setDataSource(AMediaExtractor*,
+        const char *location) __INTRODUCED_IN(21);
         // TODO support headers
 
-#if __ANDROID_API__ >= 28
-
 /**
  * Set the custom data source implementation from which the extractor will read.
  */
-media_status_t AMediaExtractor_setDataSourceCustom(AMediaExtractor*, AMediaDataSource *src);
-
-#endif /* __ANDROID_API__ >= 28 */
+media_status_t AMediaExtractor_setDataSourceCustom(AMediaExtractor*,
+        AMediaDataSource *src) __INTRODUCED_IN(28);
 
 /**
  * Return the number of tracks in the previously specified media file
  */
-size_t AMediaExtractor_getTrackCount(AMediaExtractor*);
+size_t AMediaExtractor_getTrackCount(AMediaExtractor*) __INTRODUCED_IN(21);
 
 /**
  * Return the format of the specified track. The caller must free the returned format
  */
-AMediaFormat* AMediaExtractor_getTrackFormat(AMediaExtractor*, size_t idx);
+AMediaFormat* AMediaExtractor_getTrackFormat(AMediaExtractor*, size_t idx) __INTRODUCED_IN(21);
 
 /**
  * Select the specified track. Subsequent calls to readSampleData, getSampleTrackIndex and
@@ -98,41 +94,42 @@
  * Selecting the same track multiple times has no effect, the track is
  * only selected once.
  */
-media_status_t AMediaExtractor_selectTrack(AMediaExtractor*, size_t idx);
+media_status_t AMediaExtractor_selectTrack(AMediaExtractor*, size_t idx) __INTRODUCED_IN(21);
 
 /**
  * Unselect the specified track. Subsequent calls to readSampleData, getSampleTrackIndex and
  * getSampleTime only retrieve information for the subset of tracks selected..
  */
-media_status_t AMediaExtractor_unselectTrack(AMediaExtractor*, size_t idx);
+media_status_t AMediaExtractor_unselectTrack(AMediaExtractor*, size_t idx) __INTRODUCED_IN(21);
 
 /**
  * Read the current sample.
  */
-ssize_t AMediaExtractor_readSampleData(AMediaExtractor*, uint8_t *buffer, size_t capacity);
+ssize_t AMediaExtractor_readSampleData(AMediaExtractor*,
+        uint8_t *buffer, size_t capacity) __INTRODUCED_IN(21);
 
 /**
  * Read the current sample's flags.
  */
-uint32_t AMediaExtractor_getSampleFlags(AMediaExtractor*); // see definitions below
+uint32_t AMediaExtractor_getSampleFlags(AMediaExtractor*) __INTRODUCED_IN(21);
 
 /**
  * Returns the track index the current sample originates from (or -1
  * if no more samples are available)
  */
-int AMediaExtractor_getSampleTrackIndex(AMediaExtractor*);
+int AMediaExtractor_getSampleTrackIndex(AMediaExtractor*) __INTRODUCED_IN(21);
 
 /**
  * Returns the current sample's presentation time in microseconds.
  * or -1 if no more samples are available.
  */
-int64_t AMediaExtractor_getSampleTime(AMediaExtractor*);
+int64_t AMediaExtractor_getSampleTime(AMediaExtractor*) __INTRODUCED_IN(21);
 
 /**
  * Advance to the next sample. Returns false if no more sample data
  * is available (end of stream).
  */
-bool AMediaExtractor_advance(AMediaExtractor*);
+bool AMediaExtractor_advance(AMediaExtractor*) __INTRODUCED_IN(21);
 
 typedef enum {
     AMEDIAEXTRACTOR_SEEK_PREVIOUS_SYNC,
@@ -143,7 +140,8 @@
 /**
  *
  */
-media_status_t AMediaExtractor_seekTo(AMediaExtractor*, int64_t seekPosUs, SeekMode mode);
+media_status_t AMediaExtractor_seekTo(AMediaExtractor*,
+        int64_t seekPosUs, SeekMode mode) __INTRODUCED_IN(21);
 
 /**
  * mapping of crypto scheme uuid to the scheme specific data for that scheme
@@ -165,18 +163,16 @@
 /**
  * Get the PSSH info if present.
  */
-PsshInfo* AMediaExtractor_getPsshInfo(AMediaExtractor*);
+PsshInfo* AMediaExtractor_getPsshInfo(AMediaExtractor*) __INTRODUCED_IN(21);
 
 
-AMediaCodecCryptoInfo *AMediaExtractor_getSampleCryptoInfo(AMediaExtractor *);
+AMediaCodecCryptoInfo *AMediaExtractor_getSampleCryptoInfo(AMediaExtractor *) __INTRODUCED_IN(21);
 
 enum {
     AMEDIAEXTRACTOR_SAMPLE_FLAG_SYNC = 1,
     AMEDIAEXTRACTOR_SAMPLE_FLAG_ENCRYPTED = 2,
 };
 
-#if __ANDROID_API__ >= 28
-
 /**
  * Returns the format of the extractor. The caller must free the returned format
  * using AMediaFormat_delete(format).
@@ -184,7 +180,7 @@
  * This function will always return a format; however, the format could be empty
  * (no key-value pairs) if the media container does not provide format information.
  */
-AMediaFormat* AMediaExtractor_getFileFormat(AMediaExtractor*);
+AMediaFormat* AMediaExtractor_getFileFormat(AMediaExtractor*) __INTRODUCED_IN(28);
 
 /**
  * Returns the size of the current sample in bytes, or -1 when no samples are
@@ -196,7 +192,7 @@
  * AMediaExtractor_readSampleData(ex, buf, sampleSize);
  *
  */
-ssize_t AMediaExtractor_getSampleSize(AMediaExtractor*);
+ssize_t AMediaExtractor_getSampleSize(AMediaExtractor*) __INTRODUCED_IN(28);
 
 /**
  * Returns the duration of cached media samples downloaded from a network data source
@@ -209,7 +205,7 @@
  * cached duration cannot be calculated (bitrate, duration, and file size information
  * not available).
  */
-int64_t AMediaExtractor_getCachedDuration(AMediaExtractor *);
+int64_t AMediaExtractor_getCachedDuration(AMediaExtractor *) __INTRODUCED_IN(28);
 
 /**
  * Read the current sample's metadata format into |fmt|. Examples of sample metadata are
@@ -220,11 +216,8 @@
  * Existing key-value pairs in |fmt| would be removed if this API returns AMEDIA_OK.
  * The contents of |fmt| is undefined if this API returns AMEDIA_ERROR_*.
  */
-media_status_t AMediaExtractor_getSampleFormat(AMediaExtractor *ex, AMediaFormat *fmt);
-
-#endif /* __ANDROID_API__ >= 28 */
-
-#endif /* __ANDROID_API__ >= 21 */
+media_status_t AMediaExtractor_getSampleFormat(AMediaExtractor *ex,
+        AMediaFormat *fmt) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaFormat.h b/media/ndk/include/media/NdkMediaFormat.h
index f510dff..8f37f7b 100644
--- a/media/ndk/include/media/NdkMediaFormat.h
+++ b/media/ndk/include/media/NdkMediaFormat.h
@@ -46,129 +46,123 @@
 struct AMediaFormat;
 typedef struct AMediaFormat AMediaFormat;
 
-#if __ANDROID_API__ >= 21
-
-AMediaFormat *AMediaFormat_new();
-media_status_t AMediaFormat_delete(AMediaFormat*);
+AMediaFormat *AMediaFormat_new() __INTRODUCED_IN(21);
+media_status_t AMediaFormat_delete(AMediaFormat*) __INTRODUCED_IN(21);
 
 /**
  * Human readable representation of the format. The returned string is owned by the format,
  * and remains valid until the next call to toString, or until the format is deleted.
  */
-const char* AMediaFormat_toString(AMediaFormat*);
+const char* AMediaFormat_toString(AMediaFormat*) __INTRODUCED_IN(21);
 
-bool AMediaFormat_getInt32(AMediaFormat*, const char *name, int32_t *out);
-bool AMediaFormat_getInt64(AMediaFormat*, const char *name, int64_t *out);
-bool AMediaFormat_getFloat(AMediaFormat*, const char *name, float *out);
-bool AMediaFormat_getSize(AMediaFormat*, const char *name, size_t *out);
+bool AMediaFormat_getInt32(AMediaFormat*, const char *name, int32_t *out) __INTRODUCED_IN(21);
+bool AMediaFormat_getInt64(AMediaFormat*, const char *name, int64_t *out) __INTRODUCED_IN(21);
+bool AMediaFormat_getFloat(AMediaFormat*, const char *name, float *out) __INTRODUCED_IN(21);
+bool AMediaFormat_getSize(AMediaFormat*, const char *name, size_t *out) __INTRODUCED_IN(21);
 /**
  * The returned data is owned by the format and remains valid as long as the named entry
  * is part of the format.
  */
-bool AMediaFormat_getBuffer(AMediaFormat*, const char *name, void** data, size_t *size);
+bool AMediaFormat_getBuffer(AMediaFormat*, const char *name, void** data, size_t *size) __INTRODUCED_IN(21);
 /**
  * The returned string is owned by the format, and remains valid until the next call to getString,
  * or until the format is deleted.
  */
-bool AMediaFormat_getString(AMediaFormat*, const char *name, const char **out);
+bool AMediaFormat_getString(AMediaFormat*, const char *name, const char **out) __INTRODUCED_IN(21);
 
 
-void AMediaFormat_setInt32(AMediaFormat*, const char* name, int32_t value);
-void AMediaFormat_setInt64(AMediaFormat*, const char* name, int64_t value);
-void AMediaFormat_setFloat(AMediaFormat*, const char* name, float value);
+void AMediaFormat_setInt32(AMediaFormat*, const char* name, int32_t value) __INTRODUCED_IN(21);
+void AMediaFormat_setInt64(AMediaFormat*, const char* name, int64_t value) __INTRODUCED_IN(21);
+void AMediaFormat_setFloat(AMediaFormat*, const char* name, float value) __INTRODUCED_IN(21);
 /**
  * The provided string is copied into the format.
  */
-void AMediaFormat_setString(AMediaFormat*, const char* name, const char* value);
+void AMediaFormat_setString(AMediaFormat*, const char* name, const char* value) __INTRODUCED_IN(21);
 /**
  * The provided data is copied into the format.
  */
-void AMediaFormat_setBuffer(AMediaFormat*, const char* name, void* data, size_t size);
+void AMediaFormat_setBuffer(AMediaFormat*, const char* name, void* data, size_t size) __INTRODUCED_IN(21);
 
 
 
 /**
  * XXX should these be ints/enums that we look up in a table as needed?
  */
-extern const char* AMEDIAFORMAT_KEY_AAC_DRC_ATTENUATION_FACTOR;
-extern const char* AMEDIAFORMAT_KEY_AAC_DRC_BOOST_FACTOR;
-extern const char* AMEDIAFORMAT_KEY_AAC_DRC_HEAVY_COMPRESSION;
-extern const char* AMEDIAFORMAT_KEY_AAC_DRC_TARGET_REFERENCE_LEVEL;
-extern const char* AMEDIAFORMAT_KEY_AAC_ENCODED_TARGET_LEVEL;
-extern const char* AMEDIAFORMAT_KEY_AAC_MAX_OUTPUT_CHANNEL_COUNT;
-extern const char* AMEDIAFORMAT_KEY_AAC_PROFILE;
-extern const char* AMEDIAFORMAT_KEY_AAC_SBR_MODE;
-extern const char* AMEDIAFORMAT_KEY_AUDIO_SESSION_ID;
-extern const char* AMEDIAFORMAT_KEY_BITRATE_MODE;
-extern const char* AMEDIAFORMAT_KEY_BIT_RATE;
-extern const char* AMEDIAFORMAT_KEY_CAPTURE_RATE;
-extern const char* AMEDIAFORMAT_KEY_CHANNEL_COUNT;
-extern const char* AMEDIAFORMAT_KEY_CHANNEL_MASK;
-extern const char* AMEDIAFORMAT_KEY_COLOR_FORMAT;
-extern const char* AMEDIAFORMAT_KEY_COLOR_RANGE;
-extern const char* AMEDIAFORMAT_KEY_COLOR_STANDARD;
-extern const char* AMEDIAFORMAT_KEY_COLOR_TRANSFER;
-extern const char* AMEDIAFORMAT_KEY_COMPLEXITY;
-extern const char* AMEDIAFORMAT_KEY_CSD;
-extern const char* AMEDIAFORMAT_KEY_CSD_0;
-extern const char* AMEDIAFORMAT_KEY_CSD_1;
-extern const char* AMEDIAFORMAT_KEY_CSD_2;
-extern const char* AMEDIAFORMAT_KEY_DISPLAY_CROP;
-extern const char* AMEDIAFORMAT_KEY_DISPLAY_HEIGHT;
-extern const char* AMEDIAFORMAT_KEY_DISPLAY_WIDTH;
-extern const char* AMEDIAFORMAT_KEY_DURATION;
-extern const char* AMEDIAFORMAT_KEY_FLAC_COMPRESSION_LEVEL;
-extern const char* AMEDIAFORMAT_KEY_FRAME_RATE;
-extern const char* AMEDIAFORMAT_KEY_GRID_COLUMNS;
-extern const char* AMEDIAFORMAT_KEY_GRID_ROWS;
-extern const char* AMEDIAFORMAT_KEY_HDR_STATIC_INFO;
-extern const char* AMEDIAFORMAT_KEY_HEIGHT;
-extern const char* AMEDIAFORMAT_KEY_INTRA_REFRESH_PERIOD;
-extern const char* AMEDIAFORMAT_KEY_IS_ADTS;
-extern const char* AMEDIAFORMAT_KEY_IS_AUTOSELECT;
-extern const char* AMEDIAFORMAT_KEY_IS_DEFAULT;
-extern const char* AMEDIAFORMAT_KEY_IS_FORCED_SUBTITLE;
-extern const char* AMEDIAFORMAT_KEY_I_FRAME_INTERVAL;
-extern const char* AMEDIAFORMAT_KEY_LANGUAGE;
-extern const char* AMEDIAFORMAT_KEY_LATENCY;
-extern const char* AMEDIAFORMAT_KEY_LEVEL;
-extern const char* AMEDIAFORMAT_KEY_MAX_HEIGHT;
-extern const char* AMEDIAFORMAT_KEY_MAX_INPUT_SIZE;
-extern const char* AMEDIAFORMAT_KEY_MAX_WIDTH;
-extern const char* AMEDIAFORMAT_KEY_MIME;
-extern const char* AMEDIAFORMAT_KEY_MPEG_USER_DATA;
-extern const char* AMEDIAFORMAT_KEY_OPERATING_RATE;
-extern const char* AMEDIAFORMAT_KEY_PCM_ENCODING;
-extern const char* AMEDIAFORMAT_KEY_PRIORITY;
-extern const char* AMEDIAFORMAT_KEY_PROFILE;
-extern const char* AMEDIAFORMAT_KEY_PUSH_BLANK_BUFFERS_ON_STOP;
-extern const char* AMEDIAFORMAT_KEY_REPEAT_PREVIOUS_FRAME_AFTER;
-extern const char* AMEDIAFORMAT_KEY_ROTATION;
-extern const char* AMEDIAFORMAT_KEY_SAMPLE_RATE;
-extern const char* AMEDIAFORMAT_KEY_SEI;
-extern const char* AMEDIAFORMAT_KEY_SLICE_HEIGHT;
-extern const char* AMEDIAFORMAT_KEY_STRIDE;
-extern const char* AMEDIAFORMAT_KEY_TEMPORAL_LAYER_ID;
-extern const char* AMEDIAFORMAT_KEY_TEMPORAL_LAYERING;
-extern const char* AMEDIAFORMAT_KEY_TILE_HEIGHT;
-extern const char* AMEDIAFORMAT_KEY_TILE_WIDTH;
-extern const char* AMEDIAFORMAT_KEY_TIME_US;
-extern const char* AMEDIAFORMAT_KEY_TRACK_ID;
-extern const char* AMEDIAFORMAT_KEY_TRACK_INDEX;
-extern const char* AMEDIAFORMAT_KEY_WIDTH;
+extern const char* AMEDIAFORMAT_KEY_AAC_DRC_ATTENUATION_FACTOR __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_DRC_BOOST_FACTOR __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_DRC_HEAVY_COMPRESSION __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_DRC_TARGET_REFERENCE_LEVEL __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_ENCODED_TARGET_LEVEL __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_MAX_OUTPUT_CHANNEL_COUNT __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AAC_PROFILE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_AAC_SBR_MODE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_AUDIO_SESSION_ID __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_BITRATE_MODE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_BIT_RATE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_CAPTURE_RATE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_CHANNEL_COUNT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_CHANNEL_MASK __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_COLOR_FORMAT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_COLOR_RANGE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_COLOR_STANDARD __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_COLOR_TRANSFER __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_COMPLEXITY __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_CSD __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_CSD_0 __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_CSD_1 __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_CSD_2 __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_DISPLAY_CROP __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_DISPLAY_HEIGHT __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_DISPLAY_WIDTH __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_DURATION __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_FLAC_COMPRESSION_LEVEL __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_FRAME_RATE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_GRID_COLUMNS __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_GRID_ROWS __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_HDR_STATIC_INFO __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_HEIGHT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_INTRA_REFRESH_PERIOD __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_IS_ADTS __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_IS_AUTOSELECT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_IS_DEFAULT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_IS_FORCED_SUBTITLE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_I_FRAME_INTERVAL __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_LANGUAGE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_LATENCY __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_LEVEL __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_MAX_HEIGHT __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_MAX_INPUT_SIZE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_MAX_WIDTH __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_MIME __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_MPEG_USER_DATA __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_OPERATING_RATE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_PCM_ENCODING __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_PRIORITY __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_PROFILE __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_PUSH_BLANK_BUFFERS_ON_STOP __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_REPEAT_PREVIOUS_FRAME_AFTER __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_ROTATION __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_SAMPLE_RATE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_SEI __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_SLICE_HEIGHT __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_STRIDE __INTRODUCED_IN(21);
+extern const char* AMEDIAFORMAT_KEY_TEMPORAL_LAYER_ID __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TEMPORAL_LAYERING __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TILE_HEIGHT __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TILE_WIDTH __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TIME_US __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TRACK_ID __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_TRACK_INDEX __INTRODUCED_IN(28);
+extern const char* AMEDIAFORMAT_KEY_WIDTH __INTRODUCED_IN(21);
 
-#endif /* __ANDROID_API__ >= 21 */
-
-#if __ANDROID_API__ >= 28
-bool AMediaFormat_getDouble(AMediaFormat*, const char *name, double *out);
+bool AMediaFormat_getDouble(AMediaFormat*, const char *name, double *out) __INTRODUCED_IN(28);
 bool AMediaFormat_getRect(AMediaFormat*, const char *name,
-                          int32_t *left, int32_t *top, int32_t *right, int32_t *bottom);
+        int32_t *left, int32_t *top, int32_t *right, int32_t *bottom) __INTRODUCED_IN(28);
 
-void AMediaFormat_setDouble(AMediaFormat*, const char* name, double value);
-void AMediaFormat_setSize(AMediaFormat*, const char* name, size_t value);
+void AMediaFormat_setDouble(AMediaFormat*, const char* name, double value) __INTRODUCED_IN(28);
+void AMediaFormat_setSize(AMediaFormat*, const char* name, size_t value) __INTRODUCED_IN(28);
 void AMediaFormat_setRect(AMediaFormat*, const char* name,
-                          int32_t left, int32_t top, int32_t right, int32_t bottom);
-#endif /* __ANDROID_API__ >= 28 */
+        int32_t left, int32_t top, int32_t right, int32_t bottom) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/media/ndk/include/media/NdkMediaMuxer.h b/media/ndk/include/media/NdkMediaMuxer.h
index dc9e0ac..75c70ed 100644
--- a/media/ndk/include/media/NdkMediaMuxer.h
+++ b/media/ndk/include/media/NdkMediaMuxer.h
@@ -53,17 +53,15 @@
     AMEDIAMUXER_OUTPUT_FORMAT_WEBM   = 1,
 } OutputFormat;
 
-#if __ANDROID_API__ >= 21
-
 /**
  * Create new media muxer
  */
-AMediaMuxer* AMediaMuxer_new(int fd, OutputFormat format);
+AMediaMuxer* AMediaMuxer_new(int fd, OutputFormat format) __INTRODUCED_IN(21);
 
 /**
  * Delete a previously created media muxer
  */
-media_status_t AMediaMuxer_delete(AMediaMuxer*);
+media_status_t AMediaMuxer_delete(AMediaMuxer*) __INTRODUCED_IN(21);
 
 /**
  * Set and store the geodata (latitude and longitude) in the output file.
@@ -76,7 +74,8 @@
  * Latitude must be in the range [-90, 90].
  * Longitude must be in the range [-180, 180].
  */
-media_status_t AMediaMuxer_setLocation(AMediaMuxer*, float latitude, float longitude);
+media_status_t AMediaMuxer_setLocation(AMediaMuxer*,
+        float latitude, float longitude) __INTRODUCED_IN(21);
 
 /**
  * Sets the orientation hint for output video playback.
@@ -90,26 +89,26 @@
  * The angle is specified in degrees, clockwise.
  * The supported angles are 0, 90, 180, and 270 degrees.
  */
-media_status_t AMediaMuxer_setOrientationHint(AMediaMuxer*, int degrees);
+media_status_t AMediaMuxer_setOrientationHint(AMediaMuxer*, int degrees) __INTRODUCED_IN(21);
 
 /**
  * Adds a track with the specified format.
  * Returns the index of the new track or a negative value in case of failure,
  * which can be interpreted as a media_status_t.
  */
-ssize_t AMediaMuxer_addTrack(AMediaMuxer*, const AMediaFormat* format);
+ssize_t AMediaMuxer_addTrack(AMediaMuxer*, const AMediaFormat* format) __INTRODUCED_IN(21);
 
 /**
  * Start the muxer. Should be called after AMediaMuxer_addTrack and
  * before AMediaMuxer_writeSampleData.
  */
-media_status_t AMediaMuxer_start(AMediaMuxer*);
+media_status_t AMediaMuxer_start(AMediaMuxer*) __INTRODUCED_IN(21);
 
 /**
  * Stops the muxer.
  * Once the muxer stops, it can not be restarted.
  */
-media_status_t AMediaMuxer_stop(AMediaMuxer*);
+media_status_t AMediaMuxer_stop(AMediaMuxer*) __INTRODUCED_IN(21);
 
 /**
  * Writes an encoded sample into the muxer.
@@ -119,9 +118,8 @@
  * by the encoder.)
  */
 media_status_t AMediaMuxer_writeSampleData(AMediaMuxer *muxer,
-        size_t trackIdx, const uint8_t *data, const AMediaCodecBufferInfo *info);
-
-#endif /* __ANDROID_API__ >= 21 */
+        size_t trackIdx, const uint8_t *data,
+        const AMediaCodecBufferInfo *info) __INTRODUCED_IN(21);
 
 __END_DECLS
 
diff --git a/media/ndk/libmediandk.map.txt b/media/ndk/libmediandk.map.txt
index fb56694..d828d6a 100644
--- a/media/ndk/libmediandk.map.txt
+++ b/media/ndk/libmediandk.map.txt
@@ -32,55 +32,66 @@
     AMEDIAFORMAT_KEY_AAC_DRC_TARGET_REFERENCE_LEVEL; # var introduced=28
     AMEDIAFORMAT_KEY_AAC_ENCODED_TARGET_LEVEL; # var introduced=28
     AMEDIAFORMAT_KEY_AAC_MAX_OUTPUT_CHANNEL_COUNT; # var introduced=28
-    AMEDIAFORMAT_KEY_AAC_PROFILE; # var
+    AMEDIAFORMAT_KEY_AAC_PROFILE; # var introduced=21
     AMEDIAFORMAT_KEY_AAC_SBR_MODE; # var introduced=28
     AMEDIAFORMAT_KEY_AUDIO_SESSION_ID; # var introduced=28
     AMEDIAFORMAT_KEY_BITRATE_MODE; # var introduced=28
-    AMEDIAFORMAT_KEY_BIT_RATE; # var
+    AMEDIAFORMAT_KEY_BIT_RATE; # var introduced=21
     AMEDIAFORMAT_KEY_CAPTURE_RATE; # var introduced=28
-    AMEDIAFORMAT_KEY_CHANNEL_COUNT; # var
-    AMEDIAFORMAT_KEY_CHANNEL_MASK; # var
-    AMEDIAFORMAT_KEY_COLOR_FORMAT; # var
+    AMEDIAFORMAT_KEY_CHANNEL_COUNT; # var introduced=21
+    AMEDIAFORMAT_KEY_CHANNEL_MASK; # var introduced=21
+    AMEDIAFORMAT_KEY_COLOR_FORMAT; # var introduced=21
     AMEDIAFORMAT_KEY_COLOR_RANGE; # var introduced=28
     AMEDIAFORMAT_KEY_COLOR_STANDARD; # var introduced=28
     AMEDIAFORMAT_KEY_COLOR_TRANSFER; # var introduced=28
     AMEDIAFORMAT_KEY_COMPLEXITY; # var introduced=28
+    AMEDIAFORMAT_KEY_CSD; # var introduced=28
+    AMEDIAFORMAT_KEY_CSD_0; # var introduced=28
+    AMEDIAFORMAT_KEY_CSD_1; # var introduced=28
+    AMEDIAFORMAT_KEY_CSD_2; # var introduced=28
     AMEDIAFORMAT_KEY_DISPLAY_CROP; # var introduced=28
-    AMEDIAFORMAT_KEY_DURATION; # var
-    AMEDIAFORMAT_KEY_FLAC_COMPRESSION_LEVEL; # var
-    AMEDIAFORMAT_KEY_FRAME_RATE; # var
+    AMEDIAFORMAT_KEY_DISPLAY_HEIGHT; # var introduced=28
+    AMEDIAFORMAT_KEY_DISPLAY_WIDTH; # var introduced=28
+    AMEDIAFORMAT_KEY_DURATION; # var introduced=21
+    AMEDIAFORMAT_KEY_FLAC_COMPRESSION_LEVEL; # var introduced=21
+    AMEDIAFORMAT_KEY_FRAME_RATE; # var introduced=21
     AMEDIAFORMAT_KEY_GRID_COLUMNS; # var introduced=28
     AMEDIAFORMAT_KEY_GRID_ROWS; # var introduced=28
     AMEDIAFORMAT_KEY_HDR_STATIC_INFO; # var introduced=28
-    AMEDIAFORMAT_KEY_HEIGHT; # var
+    AMEDIAFORMAT_KEY_HEIGHT; # var introduced=21
     AMEDIAFORMAT_KEY_INTRA_REFRESH_PERIOD; # var introduced=28
-    AMEDIAFORMAT_KEY_IS_ADTS; # var
-    AMEDIAFORMAT_KEY_IS_AUTOSELECT; # var
-    AMEDIAFORMAT_KEY_IS_DEFAULT; # var
-    AMEDIAFORMAT_KEY_IS_FORCED_SUBTITLE; # var
-    AMEDIAFORMAT_KEY_I_FRAME_INTERVAL; # var
-    AMEDIAFORMAT_KEY_LANGUAGE; # var
+    AMEDIAFORMAT_KEY_IS_ADTS; # var introduced=21
+    AMEDIAFORMAT_KEY_IS_AUTOSELECT; # var introduced=21
+    AMEDIAFORMAT_KEY_IS_DEFAULT; # var introduced=21
+    AMEDIAFORMAT_KEY_IS_FORCED_SUBTITLE; # var introduced=21
+    AMEDIAFORMAT_KEY_I_FRAME_INTERVAL; # var introduced=21
+    AMEDIAFORMAT_KEY_LANGUAGE; # var introduced=21
     AMEDIAFORMAT_KEY_LATENCY; # var introduced=28
     AMEDIAFORMAT_KEY_LEVEL; # var introduced=28
-    AMEDIAFORMAT_KEY_MAX_HEIGHT; # var
-    AMEDIAFORMAT_KEY_MAX_INPUT_SIZE; # var
-    AMEDIAFORMAT_KEY_MAX_WIDTH; # var
-    AMEDIAFORMAT_KEY_MIME; # var
+    AMEDIAFORMAT_KEY_MAX_HEIGHT; # var introduced=21
+    AMEDIAFORMAT_KEY_MAX_INPUT_SIZE; # var introduced=21
+    AMEDIAFORMAT_KEY_MAX_WIDTH; # var introduced=21
+    AMEDIAFORMAT_KEY_MIME; # var introduced=21
+    AMEDIAFORMAT_KEY_MPEG_USER_DATA; # var introduced=28
     AMEDIAFORMAT_KEY_OPERATING_RATE; # var introduced=28
     AMEDIAFORMAT_KEY_PCM_ENCODING; # var introduced=28
     AMEDIAFORMAT_KEY_PRIORITY; # var introduced=28
     AMEDIAFORMAT_KEY_PROFILE; # var introduced=28
-    AMEDIAFORMAT_KEY_PUSH_BLANK_BUFFERS_ON_STOP; # var
-    AMEDIAFORMAT_KEY_REPEAT_PREVIOUS_FRAME_AFTER; # var
+    AMEDIAFORMAT_KEY_PUSH_BLANK_BUFFERS_ON_STOP; # var introduced=21
+    AMEDIAFORMAT_KEY_REPEAT_PREVIOUS_FRAME_AFTER; # var introduced=21
     AMEDIAFORMAT_KEY_ROTATION; # var introduced=28
-    AMEDIAFORMAT_KEY_SAMPLE_RATE; # var
+    AMEDIAFORMAT_KEY_SAMPLE_RATE; # var introduced=21
+    AMEDIAFORMAT_KEY_SEI; # var introduced=28
     AMEDIAFORMAT_KEY_SLICE_HEIGHT; # var introduced=28
-    AMEDIAFORMAT_KEY_STRIDE; # var
+    AMEDIAFORMAT_KEY_STRIDE; # var introduced=21
+    AMEDIAFORMAT_KEY_TEMPORAL_LAYER_ID; # var introduced=28
     AMEDIAFORMAT_KEY_TEMPORAL_LAYERING; # var introduced=28
     AMEDIAFORMAT_KEY_TILE_HEIGHT; # var introduced=28
     AMEDIAFORMAT_KEY_TILE_WIDTH; # var introduced=28
+    AMEDIAFORMAT_KEY_TIME_US; # var introduced=28
+    AMEDIAFORMAT_KEY_TRACK_INDEX; # var introduced=28
     AMEDIAFORMAT_KEY_TRACK_ID; # var introduced=28
-    AMEDIAFORMAT_KEY_WIDTH; # var
+    AMEDIAFORMAT_KEY_WIDTH; # var introduced=21
     AMediaCodecActionCode_isRecoverable; # introduced=28
     AMediaCodecActionCode_isTransient; # introduced=28
     AMediaCodecCryptoInfo_delete;
diff --git a/services/audiopolicy/service/AudioPolicyEffects.cpp b/services/audiopolicy/service/AudioPolicyEffects.cpp
index c7dfe0f..4a1cab4 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.cpp
+++ b/services/audiopolicy/service/AudioPolicyEffects.cpp
@@ -460,12 +460,13 @@
         len = strnlen(node->value, EFFECT_STRING_LEN_MAX);
         if (*curSize + len + 1 > *totSize) {
             *totSize = *curSize + len + 1;
-            *param = (char *)realloc(*param, *totSize);
-            if (*param == NULL) {
+            char *newParam = (char *)realloc(*param, *totSize);
+            if (newParam == NULL) {
                 len = 0;
                 ALOGE("%s realloc error for string len %zu", __func__, *totSize);
                 goto exit;
             }
+            *param = newParam;
         }
         strncpy(*param + *curSize, node->value, len);
         *curSize += len;