diff --git a/services/audioflinger/StreamHalInterface.h b/services/audioflinger/StreamHalInterface.h
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+++ b/services/audioflinger/StreamHalInterface.h
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+/*
+ * Copyright (C) 2016 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_HARDWARE_STREAM_HAL_INTERFACE_H
+#define ANDROID_HARDWARE_STREAM_HAL_INTERFACE_H
+
+#include <hardware/audio_effect.h>
+#include <utils/Errors.h>
+#include <utils/RefBase.h>
+#include <utils/String8.h>
+
+#include "EffectHalInterface.h"
+
+namespace android {
+
+class StreamHalInterface : public virtual RefBase
+{
+  public:
+    // Return the sampling rate in Hz - eg. 44100.
+    virtual status_t getSampleRate(uint32_t *rate) = 0;
+
+    // Return size of input/output buffer in bytes for this stream - eg. 4800.
+    virtual status_t getBufferSize(size_t *size) = 0;
+
+    // Return the channel mask.
+    virtual status_t getChannelMask(audio_channel_mask_t *mask) = 0;
+
+    // Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT.
+    virtual status_t getFormat(audio_format_t *format) = 0;
+
+    // Convenience method.
+    virtual status_t getAudioProperties(
+            uint32_t *sampleRate, audio_channel_mask_t *mask, audio_format_t *format) = 0;
+
+    // Set audio stream parameters.
+    virtual status_t setParameters(const String8& kvPairs) = 0;
+
+    // Get audio stream parameters.
+    virtual status_t getParameters(const String8& keys, String8 *values) = 0;
+
+    // Return the frame size (number of bytes per sample) of a stream.
+    virtual status_t getFrameSize(size_t *size) = 0;
+
+    // Add or remove the effect on the stream.
+    virtual status_t addEffect(sp<EffectHalInterface> effect) = 0;
+    virtual status_t removeEffect(sp<EffectHalInterface> effect) = 0;
+
+    // Put the audio hardware input/output into standby mode.
+    virtual status_t standby() = 0;
+
+    virtual status_t dump(int fd) = 0;
+
+  protected:
+    // Subclasses can not be constructed directly by clients.
+    StreamHalInterface() {}
+
+    // The destructor automatically closes the stream.
+    virtual ~StreamHalInterface() {}
+};
+
+class StreamOutHalInterfaceCallback : public virtual RefBase {
+  public:
+    virtual void onWriteReady() {}
+    virtual void onDrainReady() {}
+    virtual void onError() {}
+
+  protected:
+    StreamOutHalInterfaceCallback() {}
+    virtual ~StreamOutHalInterfaceCallback() {}
+};
+
+class StreamOutHalInterface : public virtual StreamHalInterface {
+  public:
+    // Return the audio hardware driver estimated latency in milliseconds.
+    virtual status_t getLatency(uint32_t *latency) = 0;
+
+    // Use this method in situations where audio mixing is done in the hardware.
+    virtual status_t setVolume(float left, float right) = 0;
+
+    // Write audio buffer to driver.
+    virtual status_t write(const void *buffer, size_t bytes, size_t *written) = 0;
+
+    // Return the number of audio frames written by the audio dsp to DAC since
+    // the output has exited standby.
+    virtual status_t getRenderPosition(uint32_t *dspFrames) = 0;
+
+    // Get the local time at which the next write to the audio driver will be presented.
+    virtual status_t getNextWriteTimestamp(int64_t *timestamp) = 0;
+
+    // Set the callback for notifying completion of non-blocking write and drain.
+    // The callback must be owned by someone else. The output stream does not own it
+    // to avoid strong pointer loops.
+    virtual status_t setCallback(sp<StreamOutHalInterfaceCallback> callback) = 0;
+
+    // Returns whether pause and resume operations are supported.
+    virtual status_t supportsPauseAndResume(bool *supportsPause, bool *supportsResume) = 0;
+
+    // Notifies to the audio driver to resume playback following a pause.
+    virtual status_t pause() = 0;
+
+    // Notifies to the audio driver to resume playback following a pause.
+    virtual status_t resume() = 0;
+
+    // Returns whether drain operation is supported.
+    virtual status_t supportsDrain(bool *supportsDrain) = 0;
+
+    // Requests notification when data buffered by the driver/hardware has been played.
+    virtual status_t drain(audio_drain_type_t type) = 0;
+
+    // Notifies to the audio driver to flush the queued data.
+    virtual status_t flush() = 0;
+
+    // Return a recent count of the number of audio frames presented to an external observer.
+    virtual status_t getPresentationPosition(uint64_t *frames, struct timespec *timestamp) = 0;
+
+  protected:
+    virtual ~StreamOutHalInterface() {}
+};
+
+class StreamInHalInterface : public virtual StreamHalInterface {
+  public:
+    // Set the input gain for the audio driver.
+    virtual status_t setGain(float gain) = 0;
+
+    // Read audio buffer in from driver.
+    virtual status_t read(void *buffer, size_t bytes, size_t *read) = 0;
+
+    // Return the amount of input frames lost in the audio driver.
+    virtual status_t getInputFramesLost(uint32_t *framesLost) = 0;
+
+    // Return a recent count of the number of audio frames received and
+    // the clock time associated with that frame count.
+    virtual status_t getCapturePosition(int64_t *frames, int64_t *time) = 0;
+
+  protected:
+    virtual ~StreamInHalInterface() {}
+};
+
+} // namespace android
+
+#endif // ANDROID_HARDWARE_STREAM_HAL_INTERFACE_H