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/common_audio/signal_processing/ilbc_specific_functions.c

@@ -0,0 +1,90 @@
+/*
+ *  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.
+ */
+
+
+/*
+ * This file contains implementations of the iLBC specific functions
+ * WebRtcSpl_ReverseOrderMultArrayElements()
+ * WebRtcSpl_ElementwiseVectorMult()
+ * WebRtcSpl_AddVectorsAndShift()
+ * WebRtcSpl_AddAffineVectorToVector()
+ * WebRtcSpl_AffineTransformVector()
+ *
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_ReverseOrderMultArrayElements(int16_t *out, const int16_t *in,
+                                             const int16_t *win,
+                                             size_t vector_length,
+                                             int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *inptr = in;
+    const int16_t *winptr = win;
+    for (i = 0; i < vector_length; i++)
+    {
+      *outptr++ = (int16_t)((*inptr++ * *winptr--) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_ElementwiseVectorMult(int16_t *out, const int16_t *in,
+                                     const int16_t *win, size_t vector_length,
+                                     int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *inptr = in;
+    const int16_t *winptr = win;
+    for (i = 0; i < vector_length; i++)
+    {
+      *outptr++ = (int16_t)((*inptr++ * *winptr++) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AddVectorsAndShift(int16_t *out, const int16_t *in1,
+                                  const int16_t *in2, size_t vector_length,
+                                  int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *in1ptr = in1;
+    const int16_t *in2ptr = in2;
+    for (i = vector_length; i > 0; i--)
+    {
+        (*outptr++) = (int16_t)(((*in1ptr++) + (*in2ptr++)) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AddAffineVectorToVector(int16_t *out, int16_t *in,
+                                       int16_t gain, int32_t add_constant,
+                                       int16_t right_shifts,
+                                       size_t vector_length)
+{
+    size_t i;
+
+    for (i = 0; i < vector_length; i++)
+    {
+      out[i] += (int16_t)((in[i] * gain + add_constant) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AffineTransformVector(int16_t *out, int16_t *in,
+                                     int16_t gain, int32_t add_constant,
+                                     int16_t right_shifts, size_t vector_length)
+{
+    size_t i;
+
+    for (i = 0; i < vector_length; i++)
+    {
+      out[i] = (int16_t)((in[i] * gain + add_constant) >> right_shifts);
+    }
+}