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+/*
+ * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_X_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_X_H_
+
+#include "webrtc/typedefs.h"
+
+typedef struct NsxHandleT NsxHandle;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This function creates an instance to the noise reduction structure
+ *
+ * Input:
+ * - nsxInst : Pointer to noise reduction instance that should be
+ * created
+ *
+ * Output:
+ * - nsxInst : Pointer to created noise reduction instance
+ *
+ * Return value : 0 - Ok
+ * -1 - Error
+ */
+int WebRtcNsx_Create(NsxHandle** nsxInst);
+
+
+/*
+ * This function frees the dynamic memory of a specified Noise Suppression
+ * instance.
+ *
+ * Input:
+ * - nsxInst : Pointer to NS instance that should be freed
+ *
+ * Return value : 0 - Ok
+ * -1 - Error
+ */
+int WebRtcNsx_Free(NsxHandle* nsxInst);
+
+
+/*
+ * This function initializes a NS instance
+ *
+ * Input:
+ * - nsxInst : Instance that should be initialized
+ * - fs : sampling frequency
+ *
+ * Output:
+ * - nsxInst : Initialized instance
+ *
+ * Return value : 0 - Ok
+ * -1 - Error
+ */
+int WebRtcNsx_Init(NsxHandle* nsxInst, uint32_t fs);
+
+/*
+ * This changes the aggressiveness of the noise suppression method.
+ *
+ * Input:
+ * - nsxInst : Instance that should be initialized
+ * - mode : 0: Mild, 1: Medium , 2: Aggressive
+ *
+ * Output:
+ * - nsxInst : Initialized instance
+ *
+ * Return value : 0 - Ok
+ * -1 - Error
+ */
+int WebRtcNsx_set_policy(NsxHandle* nsxInst, int mode);
+
+/*
+ * This functions does noise suppression for the inserted speech frame. The
+ * input and output signals should always be 10ms (80 or 160 samples).
+ *
+ * Input
+ * - nsxInst : NSx instance. Needs to be initiated before call.
+ * - speechFrame : Pointer to speech frame buffer for L band
+ * - speechFrameHB : Pointer to speech frame buffer for H band
+ * - fs : sampling frequency
+ *
+ * Output:
+ * - nsxInst : Updated NSx instance
+ * - outFrame : Pointer to output frame for L band
+ * - outFrameHB : Pointer to output frame for H band
+ *
+ * Return value : 0 - OK
+ * -1 - Error
+ */
+int WebRtcNsx_Process(NsxHandle* nsxInst,
+ short* speechFrame,
+ short* speechFrameHB,
+ short* outFrame,
+ short* outFrameHB);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_X_H_
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