git-svn-id: http://webrtc.googlecode.com/svn/trunk@4 4adac7df-926f-26a2-2b94-8c16560cd09d

2011-05-30 11:22:19 +00:00
parent 01813fe945
commit 77ae29bc81
1153 changed files with 404089 additions and 0 deletions
--- a/modules/audio_coding/codecs/iLBC/main/source/window32_w32.c
+++ b/modules/audio_coding/codecs/iLBC/main/source/window32_w32.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.
+ */
+
+/******************************************************************
+
+ iLBC Speech Coder ANSI-C Source Code
+
+ WebRtcIlbcfix_Window32W32.c
+
+******************************************************************/
+
+#include "defines.h"
+
+/*----------------------------------------------------------------*
+ *  window multiplication
+ *---------------------------------------------------------------*/
+
+void WebRtcIlbcfix_Window32W32(
+    WebRtc_Word32 *z,    /* Output */
+    WebRtc_Word32 *x,    /* Input (same domain as Output)*/
+    const WebRtc_Word32  *y,  /* Q31 Window */
+    WebRtc_Word16 N     /* length to process */
+                               ) {
+  WebRtc_Word16 i;
+  WebRtc_Word16 x_low, x_hi, y_low, y_hi;
+  WebRtc_Word16 left_shifts;
+  WebRtc_Word32 temp;
+
+  left_shifts = (WebRtc_Word16)WebRtcSpl_NormW32(x[0]);
+  WebRtcSpl_VectorBitShiftW32(x, N, x, (WebRtc_Word16)(-left_shifts));
+
+
+  /* The double precision numbers use a special representation:
+   * w32 = hi<<16 + lo<<1
+   */
+  for (i = 0; i < N; i++) {
+    /* Extract higher bytes */
+    x_hi = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32(x[i], 16);
+    y_hi = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32(y[i], 16);
+
+    /* Extract lower bytes, defined as (w32 - hi<<16)>>1 */
+    temp = WEBRTC_SPL_LSHIFT_W32((WebRtc_Word32)x_hi, 16);
+    x_low = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32((x[i] - temp), 1);
+
+    temp = WEBRTC_SPL_LSHIFT_W32((WebRtc_Word32)y_hi, 16);
+    y_low = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32((y[i] - temp), 1);
+
+    /* Calculate z by a 32 bit multiplication using both low and high from x and y */
+    temp = WEBRTC_SPL_LSHIFT_W32(WEBRTC_SPL_MUL_16_16(x_hi, y_hi), 1);
+    temp = (temp + (WEBRTC_SPL_MUL_16_16_RSFT(x_hi, y_low, 14)));
+
+    z[i] = (temp + (WEBRTC_SPL_MUL_16_16_RSFT(x_low, y_hi, 14)));
+  }
+
+  WebRtcSpl_VectorBitShiftW32(z, N, z, left_shifts);
+
+  return;
+}