1 files changed, 63 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/vq4.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/vq4.c
new file mode 100644
index 0000000000..c9a65aec2a
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/vq4.c
@@ -0,0 +1,63 @@
+/*
+ *  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_Vq4.c
+
+******************************************************************/
+
+#include "modules/audio_coding/codecs/ilbc/vq4.h"
+
+#include "modules/audio_coding/codecs/ilbc/constants.h"
+
+/*----------------------------------------------------------------*
+ *  vector quantization
+ *---------------------------------------------------------------*/
+
+void WebRtcIlbcfix_Vq4(
+    int16_t *Xq, /* quantized vector (Q13) */
+    int16_t *index,
+    int16_t *CB, /* codebook in Q13 */
+    int16_t *X,  /* vector to quantize (Q13) */
+    int16_t n_cb
+                       ){
+  int16_t i, j;
+  int16_t pos, minindex=0;
+  int16_t tmp;
+  int32_t dist, mindist;
+
+  pos = 0;
+  mindist = WEBRTC_SPL_WORD32_MAX; /* start value */
+
+  /* Find the codebook with the lowest square distance */
+  for (j = 0; j < n_cb; j++) {
+    tmp = X[0] - CB[pos];
+    dist = tmp * tmp;
+    for (i = 1; i < 4; i++) {
+      tmp = X[i] - CB[pos + i];
+      dist += tmp * tmp;
+    }
+
+    if (dist < mindist) {
+      mindist = dist;
+      minindex = j;
+    }
+    pos += 4;
+  }
+
+  /* Store the quantized codebook and the index */
+  for (i = 0; i < 4; i++) {
+    Xq[i] = CB[minindex*4 + i];
+  }
+  *index = minindex;
+}