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diff --git a/services/audioflinger/AudioHwDevice.h b/services/audioflinger/AudioHwDevice.h
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+++ b/services/audioflinger/AudioHwDevice.h
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+/*
+**
+** Copyright 2007, The Android Open Source 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.
+*/
+
+#ifndef ANDROID_AUDIO_HW_DEVICE_H
+#define ANDROID_AUDIO_HW_DEVICE_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <hardware/audio.h>
+#include <utils/Errors.h>
+#include <system/audio.h>
+
+
+namespace android {
+
+class AudioStreamOut;
+
+class AudioHwDevice {
+public:
+    enum Flags {
+        AHWD_CAN_SET_MASTER_VOLUME  = 0x1,
+        AHWD_CAN_SET_MASTER_MUTE    = 0x2,
+    };
+
+    AudioHwDevice(audio_module_handle_t handle,
+                  const char *moduleName,
+                  audio_hw_device_t *hwDevice,
+                  Flags flags)
+        : mHandle(handle)
+        , mModuleName(strdup(moduleName))
+        , mHwDevice(hwDevice)
+        , mFlags(flags) { }
+    virtual ~AudioHwDevice() { free((void *)mModuleName); }
+
+    bool canSetMasterVolume() const {
+        return (0 != (mFlags & AHWD_CAN_SET_MASTER_VOLUME));
+    }
+
+    bool canSetMasterMute() const {
+        return (0 != (mFlags & AHWD_CAN_SET_MASTER_MUTE));
+    }
+
+    audio_module_handle_t handle() const { return mHandle; }
+    const char *moduleName() const { return mModuleName; }
+    audio_hw_device_t *hwDevice() const { return mHwDevice; }
+    uint32_t version() const { return mHwDevice->common.version; }
+
+    /** This method creates and opens the audio hardware output stream.
+     * The "address" parameter qualifies the "devices" audio device type if needed.
+     * The format format depends on the device type:
+     * - Bluetooth devices use the MAC address of the device in the form "00:11:22:AA:BB:CC"
+     * - USB devices use the ALSA card and device numbers in the form  "card=X;device=Y"
+     * - Other devices may use a number or any other string.
+     */
+    status_t openOutputStream(
+            AudioStreamOut **ppStreamOut,
+            audio_io_handle_t handle,
+            audio_devices_t devices,
+            audio_output_flags_t flags,
+            struct audio_config *config,
+            const char *address);
+
+private:
+    const audio_module_handle_t mHandle;
+    const char * const          mModuleName;
+    audio_hw_device_t * const   mHwDevice;
+    const Flags                 mFlags;
+};
+
+} // namespace android
+
+#endif // ANDROID_AUDIO_HW_DEVICE_H