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 "modules/audio_coding/codecs/ilbc/sort_sq.h" 20 21 #include "modules/audio_coding/codecs/ilbc/defines.h" 22 23 /*----------------------------------------------------------------* 24 * scalar quantization 25 *---------------------------------------------------------------*/ 26 WebRtcIlbcfix_SortSq(int16_t * xq,int16_t * index,int16_t x,const int16_t * cb,int16_t cb_size)27void WebRtcIlbcfix_SortSq( 28 int16_t *xq, /* (o) the quantized value */ 29 int16_t *index, /* (o) the quantization index */ 30 int16_t x, /* (i) the value to quantize */ 31 const int16_t *cb, /* (i) the quantization codebook */ 32 int16_t cb_size /* (i) the size of the quantization codebook */ 33 ){ 34 int i; 35 36 if (x <= cb[0]) { 37 *index = 0; 38 *xq = cb[0]; 39 } else { 40 i = 0; 41 while ((x > cb[i]) && (i < (cb_size-1))) { 42 i++; 43 } 44 45 if (x > (((int32_t)cb[i] + cb[i - 1] + 1) >> 1)) { 46 *index = i; 47 *xq = cb[i]; 48 } else { 49 *index = i - 1; 50 *xq = cb[i - 1]; 51 } 52 } 53 } 54