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+/*
+ * Copyright (C) 2017 "Audiokinetic Inc"
+ * Author Francois Thibault <fthibault@audiokinetic.com>
+ *
+ * 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.
+ */
+
+#ifndef AHL_INTERFACE_INCLUDE
+#define AHL_INTERFACE_INCLUDE
+
+#define UNDEFINED_ID -1
+
+typedef int endpointID_t;
+typedef int streamID_t;
+
+typedef enum EndpointType {
+    ENDPOINTTYPE_SOURCE = 0,        // source devices
+    ENDPOINTTYPE_SINK,              // sink devices
+    ENDPOINTTYPE_MAXVALUE           // Enum count, keep at the end
+} EndpointTypeT;
+
+// Standardized name for common audio roles (not enforced in any way, just helps system being more compatible)
+#define AUDIOROLE_WARNING "warning"             // Safety-relevant or critical alerts/alarms
+#define AUDIOROLE_GUIDANCE "guidance"           // Important user information where user action is expected (e.g. navigation instruction)
+#define AUDIOROLE_NOTIFICATION "notification"   // HMI or else notifications (e.g. touchscreen events, speech recognition on/off,...)
+#define AUDIOROLE_COMMUNICATION "communications" // Voice communications (e.g. handsfree, speech recognition)
+#define AUDIOROLE_ENTERTAINMENT "entertainment"  // Multimedia content (e.g. tuner, media player, etc.)
+#define AUDIOROLE_SYSTEM "system"               // System level content or development
+#define AUDIOROLE_STARTUP "startup"             // Early (startup) sound
+#define AUDIOROLE_SHUTDOWN "shutdown"           // Late (shutdown) sound
+#define AUDIOROLE_NONE "none"                   // Non-assigned / legacy applications
+
+typedef enum DeviceURIType {
+    DEVICEURITYPE_ALSA_HW = 0,  // Alsa hardware device URI
+    DEVICEURITYPE_ALSA_DMIX,    // Alsa Dmix device URI (only for playback devices)
+    DEVICEURITYPE_ALSA_DSNOOP,  // Alsa DSnoop device URI (only for capture devices)
+    DEVICEURITYPE_ALSA_SOFTVOL, // Alsa softvol device URI
+    DEVICEURITYPE_ALSA_OTHER,   // Alsa domain URI device of unspecified type
+    DEVICEURITYPE_PULSE,        // Pulse device URI
+    DEVICEURITYPE_GSTREAMER,    // GStreamer device URI
+    DEVICEURITYPE_EXTERNAL,     // Device URI for external ECU device
+    DEVICEURITYPE_MAXVALUE      // Enum count, keep at the end
+} DeviceURITypeT;
+
+// Standardized list of properties (string used for extensibility)
+#define AUDIOHL_PROPERTY_BALANCE "balance"
+#define AUDIOHL_PROPERTY_FADE "fade"
+#define AUDIOHL_PROPERTY_EQ_LOW "eq_low" 
+#define AUDIOHL_PROPERTY_EQ_MID "eq_mid" 
+#define AUDIOHL_PROPERTY_EQ_HIGH "eq_high"
+
+// Standardized list of state names/values (string used for extensibility)
+#define AUDIOHL_STATE_NAME_ACTIVE "active"
+#define AUDIOHL_STATE_NAME_MUTE "mute" 
+#define AUDIOHL_STATE_VALUE_ON "on"
+#define AUDIOHL_STATE_VALUE_OFF "off" 
+
+// Known audio domain string definitions (for configuration file format)
+#define AUDIOHL_DOMAIN_ALSA "Alsa"
+#define AUDIOHL_DOMAIN_PULSE "Pulse"
+#define AUDIOHL_DOMAIN_GSTREAMER "GStreamer"
+#define AUDIOHL_DOMAIN_EXTERNAL "External"
+
+#endif // AHL_INTERFACE_INCLUDE