Update common_audio

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

Update notes:

 * Moved src/ to webrtc/ to easily diff against the third_party/webrtc
   in the chromium tree

 * ARM/NEON/MIPS support is not yet hooked up

 * Tests have not been copied

webrtc/modules/audio_processing/ns/noise_suppression.c

@@ -0,0 +1,65 @@
+/*
+ *  Copyright (c) 2011 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "noise_suppression.h"
+#include "ns_core.h"
+#include "defines.h"
+
+int WebRtcNs_get_version(char* versionStr, short length) {
+  const char version[] = "NS 2.2.0";
+  const short versionLen = (short)strlen(version) + 1; // +1: null-termination
+
+  if (versionStr == NULL) {
+    return -1;
+  }
+
+  if (versionLen > length) {
+    return -1;
+  }
+
+  strncpy(versionStr, version, versionLen);
+
+  return 0;
+}
+
+int WebRtcNs_Create(NsHandle** NS_inst) {
+  *NS_inst = (NsHandle*) malloc(sizeof(NSinst_t));
+  if (*NS_inst != NULL) {
+    (*(NSinst_t**)NS_inst)->initFlag = 0;
+    return 0;
+  } else {
+    return -1;
+  }
+
+}
+
+int WebRtcNs_Free(NsHandle* NS_inst) {
+  free(NS_inst);
+  return 0;
+}
+
+
+int WebRtcNs_Init(NsHandle* NS_inst, WebRtc_UWord32 fs) {
+  return WebRtcNs_InitCore((NSinst_t*) NS_inst, fs);
+}
+
+int WebRtcNs_set_policy(NsHandle* NS_inst, int mode) {
+  return WebRtcNs_set_policy_core((NSinst_t*) NS_inst, mode);
+}
+
+
+int WebRtcNs_Process(NsHandle* NS_inst, short* spframe, short* spframe_H,
+                     short* outframe, short* outframe_H) {
+  return WebRtcNs_ProcessCore(
+      (NSinst_t*) NS_inst, spframe, spframe_H, outframe, outframe_H);
+}