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_SimpleLsfQ.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 #include "split_vq.h" 21 #include "constants.h" 22 23 /*----------------------------------------------------------------* 24 * lsf quantizer (subrutine to LPCencode) 25 *---------------------------------------------------------------*/ 26 27 void WebRtcIlbcfix_SimpleLsfQ( 28 int16_t *lsfdeq, /* (o) dequantized lsf coefficients 29 (dimension FILTERORDER) Q13 */ 30 int16_t *index, /* (o) quantization index */ 31 int16_t *lsf, /* (i) the lsf coefficient vector to be 32 quantized (dimension FILTERORDER) Q13 */ 33 int16_t lpc_n /* (i) number of lsf sets to quantize */ 34 ){ 35 36 /* Quantize first LSF with memoryless split VQ */ 37 WebRtcIlbcfix_SplitVq( lsfdeq, index, lsf, 38 (int16_t*)WebRtcIlbcfix_kLsfCb, (int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb); 39 40 if (lpc_n==2) { 41 /* Quantize second LSF with memoryless split VQ */ 42 WebRtcIlbcfix_SplitVq( lsfdeq + LPC_FILTERORDER, index + LSF_NSPLIT, 43 lsf + LPC_FILTERORDER, (int16_t*)WebRtcIlbcfix_kLsfCb, 44 (int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb); 45 } 46 return; 47 } 48
