Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/audio_coding/codecs/ilbc/lsf_to_poly.c

@@ -0,0 +1,86 @@
+/*
+ *  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.
+ */
+
+/******************************************************************
+
+ iLBC Speech Coder ANSI-C Source Code
+
+ WebRtcIlbcfix_Lsf2Poly.c
+
+******************************************************************/
+
+#include "defines.h"
+#include "lsf_to_lsp.h"
+#include "get_lsp_poly.h"
+#include "constants.h"
+
+void WebRtcIlbcfix_Lsf2Poly(
+    int16_t *a,     /* (o) predictor coefficients (order = 10) in Q12 */
+    int16_t *lsf    /* (i) line spectral frequencies in Q13 */
+                            ) {
+  int32_t f[2][6]; /* f[0][] and f[1][] corresponds to
+                            F1(z) and F2(z) respectivly */
+  int32_t *f1ptr, *f2ptr;
+  int16_t *a1ptr, *a2ptr;
+  int32_t tmpW32;
+  int16_t lsp[10];
+  int i;
+
+  /* Convert lsf to lsp */
+  WebRtcIlbcfix_Lsf2Lsp(lsf, lsp, LPC_FILTERORDER);
+
+  /* Get F1(z) and F2(z) from the lsp */
+  f1ptr=f[0];
+  f2ptr=f[1];
+  WebRtcIlbcfix_GetLspPoly(&lsp[0],f1ptr);
+  WebRtcIlbcfix_GetLspPoly(&lsp[1],f2ptr);
+
+  /* for i = 5 down to 1
+     Compute f1[i] += f1[i-1];
+     and     f2[i] += f2[i-1];
+  */
+  f1ptr=&f[0][5];
+  f2ptr=&f[1][5];
+  for (i=5; i>0; i--)
+  {
+    (*f1ptr) += (*(f1ptr-1));
+    (*f2ptr) -= (*(f2ptr-1));
+    f1ptr--;
+    f2ptr--;
+  }
+
+  /* Get the A(z) coefficients
+     a[0] = 1.0
+     for i = 1 to 5
+     a[i] = (f1[i] + f2[i] + round)>>13;
+     for i = 1 to 5
+     a[11-i] = (f1[i] - f2[i] + round)>>13;
+  */
+  a[0]=4096;
+  a1ptr=&a[1];
+  a2ptr=&a[10];
+  f1ptr=&f[0][1];
+  f2ptr=&f[1][1];
+  for (i=5; i>0; i--)
+  {
+    tmpW32 = (*f1ptr) + (*f2ptr);
+    *a1ptr = (int16_t)((tmpW32 + 4096) >> 13);
+
+    tmpW32 = (*f1ptr) - (*f2ptr);
+    *a2ptr = (int16_t)((tmpW32 + 4096) >> 13);
+
+    a1ptr++;
+    a2ptr--;
+    f1ptr++;
+    f2ptr++;
+  }
+
+  return;
+}