} audio_in_acoustics_t;
typedef uint32_t audio_devices_t;
+/**
+ * Stub audio output device. Used in policy configuration file on platforms without audio outputs.
+ * This alias value to AUDIO_DEVICE_OUT_DEFAULT is only used in the audio policy context.
+ */
+#define AUDIO_DEVICE_OUT_STUB AUDIO_DEVICE_OUT_DEFAULT
+/**
+ * Stub audio input device. Used in policy configuration file on platforms without audio inputs.
+ * This alias value to AUDIO_DEVICE_IN_DEFAULT is only used in the audio policy context.
+ */
+#define AUDIO_DEVICE_IN_STUB AUDIO_DEVICE_IN_DEFAULT
/* Additional information about compressed streams offloaded to
* hardware playback