Add Hotword audio capture constants.

Add constants to expose the system level hotword audio capture
permission and input source.

Change-Id: Ibc52dc27097dcb69125fc9c6381e021583cba148

Android.mk

@@ -163,7 +163,7 @@ LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR:= build/tools/droiddoc/templates-sdk
 
 LOCAL_DROIDDOC_OPTIONS:= \
         -stubs $(TARGET_OUT_COMMON_INTERMEDIATES)/JAVA_LIBRARIES/cmsdk_stubs_current_intermediates/src \
-        -stubpackages cyanogenmod.alarmclock:cyanogenmod.app:cyanogenmod.hardware:cyanogenmod.os:cyanogenmod.profiles:cyanogenmod.providers:cyanogenmod.platform:org.cyanogenmod.platform \
+        -stubpackages cyanogenmod.alarmclock:cyanogenmod.app:cyanogenmod.hardware:cyanogenmod.media:cyanogenmod.os:cyanogenmod.profiles:cyanogenmod.providers:cyanogenmod.platform:org.cyanogenmod.platform \
         -api $(INTERNAL_CM_PLATFORM_API_FILE) \
         -removedApi $(INTERNAL_CM_PLATFORM_REMOVED_API_FILE) \
         -nodocs \
@@ -192,7 +192,7 @@ LOCAL_MODULE := cm-system-api-stubs
 
 LOCAL_DROIDDOC_OPTIONS:=\
         -stubs $(TARGET_OUT_COMMON_INTERMEDIATES)/JAVA_LIBRARIES/cmsdk_system_stubs_current_intermediates/src \
-        -stubpackages cyanogenmod.alarmclock:cyanogenmod.app:cyanogenmod.hardware:cyanogenmod.os:cyanogenmod.profiles:cyanogenmod.providers:cyanogenmod.platform:org.cyanogenmod.platform \
+        -stubpackages cyanogenmod.alarmclock:cyanogenmod.app:cyanogenmod.hardware:cyanogenmod.media:cyanogenmod.os:cyanogenmod.profiles:cyanogenmod.providers:cyanogenmod.platform:org.cyanogenmod.platform \
         -showAnnotation android.annotation.SystemApi \
         -api $(INTERNAL_CM_PLATFORM_SYSTEM_API_FILE) \
         -removedApi $(INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE) \

src/java/cyanogenmod/media/MediaRecorder.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cyanogenmod.media;
+
+public class MediaRecorder {
+    /**
+     * Allows an application to listen passively to the device microphone in the background
+     * to detect speech of a hotword or phrase.
+     *
+     * This is a system|signature permission.
+     */
+    public static final String CAPTURE_AUDIO_HOTWORD_PERMISSION
+            = "android.permission.CAPTURE_AUDIO_HOTWORD";
+
+    public class AudioSource {
+        /**
+         * Audio source for preemptible, low-priority software hotword detection
+         * It presents the same gain and pre processing tuning as
+         * {@link android.media.MediaRecorder.AudioSource#VOICE_RECOGNITION}.
+         * <p>
+         * An application should use this audio source when it wishes to do
+         * always-on software hotword detection, while gracefully giving in to any other application
+         * that might want to read from the microphone.
+         * </p>
+         * You must hold {@link cyanogenmod.media.MediaRecorder#CAPTURE_AUDIO_HOTWORD_PERMISSION}
+         * to use this audio source.
+         */
+        public static final int HOTWORD = 1999;
+    }
+}