1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /****************************************************************** 12 13 iLBC Speech Coder ANSI-C Source Code 14 15 WebRtcIlbcfix_SortSq.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 21 /*----------------------------------------------------------------* 22 * scalar quantization 23 *---------------------------------------------------------------*/ 24 25 void WebRtcIlbcfix_SortSq( 26 int16_t *xq, /* (o) the quantized value */ 27 int16_t *index, /* (o) the quantization index */ 28 int16_t x, /* (i) the value to quantize */ 29 const int16_t *cb, /* (i) the quantization codebook */ 30 int16_t cb_size /* (i) the size of the quantization codebook */ 31 ){ 32 int i; 33 34 if (x <= cb[0]) { 35 *index = 0; 36 *xq = cb[0]; 37 } else { 38 i = 0; 39 while ((x > cb[i]) && (i < (cb_size-1))) { 40 i++; 41 } 42 43 if (x > (((int32_t)cb[i] + cb[i - 1] + 1) >> 1)) { 44 *index = i; 45 *xq = cb[i]; 46 } else { 47 *index = i - 1; 48 *xq = cb[i - 1]; 49 } 50 } 51 } 52
