1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/webrtc/src/webrtc/common_audio/signal_processing/dot_product_with_scale.c b/third_party/webrtc/src/webrtc/common_audio/signal_processing/dot_product_with_scale.c
new file mode 100644
index 00000000..1302d625
--- /dev/null
+++ b/third_party/webrtc/src/webrtc/common_audio/signal_processing/dot_product_with_scale.c
@@ -0,0 +1,32 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
+                                      const int16_t* vector2,
+                                      size_t length,
+                                      int scaling) {
+  int32_t sum = 0;
+  size_t i = 0;
+
+  /* Unroll the loop to improve performance. */
+  for (i = 0; i + 3 < length; i += 4) {
+    sum += (vector1[i + 0] * vector2[i + 0]) >> scaling;
+    sum += (vector1[i + 1] * vector2[i + 1]) >> scaling;
+    sum += (vector1[i + 2] * vector2[i + 2]) >> scaling;
+    sum += (vector1[i + 3] * vector2[i + 3]) >> scaling;
+  }
+  for (; i < length; i++) {
+    sum += (vector1[i] * vector2[i]) >> scaling;
+  }
+
+  return sum;
+}