Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/modules/audio_processing/ns/include/noise_suppression.h

@@ -0,0 +1,123 @@
+/*
+ *  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_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_H_
+
+#include "webrtc/typedefs.h"
+
+typedef struct NsHandleT NsHandle;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This function creates an instance to the noise suppression structure
+ *
+ * Input:
+ *      - NS_inst       : Pointer to noise suppression instance that should be
+ *                        created
+ *
+ * Output:
+ *      - NS_inst       : Pointer to created noise suppression instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNs_Create(NsHandle** NS_inst);
+
+
+/*
+ * This function frees the dynamic memory of a specified noise suppression
+ * instance.
+ *
+ * Input:
+ *      - NS_inst       : Pointer to NS instance that should be freed
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNs_Free(NsHandle* NS_inst);
+
+
+/*
+ * This function initializes a NS instance and has to be called before any other
+ * processing is made.
+ *
+ * Input:
+ *      - NS_inst       : Instance that should be initialized
+ *      - fs            : sampling frequency
+ *
+ * Output:
+ *      - NS_inst       : Initialized instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNs_Init(NsHandle* NS_inst, uint32_t fs);
+
+/*
+ * This changes the aggressiveness of the noise suppression method.
+ *
+ * Input:
+ *      - NS_inst       : Noise suppression instance.
+ *      - mode          : 0: Mild, 1: Medium , 2: Aggressive
+ *
+ * Output:
+ *      - NS_inst       : Updated instance.
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNs_set_policy(NsHandle* NS_inst, 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
+ *      - NS_inst       : Noise suppression instance.
+ *      - spframe       : Pointer to speech frame buffer for L band
+ *      - spframe_H     : Pointer to speech frame buffer for H band
+ *      - fs            : sampling frequency
+ *
+ * Output:
+ *      - NS_inst       : Updated NS instance
+ *      - outframe      : Pointer to output frame for L band
+ *      - outframe_H    : Pointer to output frame for H band
+ *
+ * Return value         :  0 - OK
+ *                        -1 - Error
+ */
+int WebRtcNs_Process(NsHandle* NS_inst,
+                     float* spframe,
+                     float* spframe_H,
+                     float* outframe,
+                     float* outframe_H);
+
+/* Returns the internally used prior speech probability of the current frame.
+ * There is a frequency bin based one as well, with which this should not be
+ * confused.
+ *
+ * Input
+ *      - handle        : Noise suppression instance.
+ *
+ * Return value         : Prior speech probability in interval [0.0, 1.0].
+ *                        -1 - NULL pointer or uninitialized instance.
+ */
+float WebRtcNs_prior_speech_probability(NsHandle* handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_H_