1b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/* 2b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * 4b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Use of this source code is governed by a BSD-style license 5b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * that can be found in the LICENSE file in the root of the source 6b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * tree. An additional intellectual property rights grant can be found 7b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * in the file PATENTS. All contributing project authors may 8b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * be found in the AUTHORS file in the root of the source tree. 9b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org */ 10b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 11b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/****************************************************************** 12b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 13b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC Speech Coder ANSI-C Source Code 14b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 15b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_SimpleLsfDeQ.c 16b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 17b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org******************************************************************/ 18b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 19b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "defines.h" 20b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "constants.h" 21b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 22b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/*----------------------------------------------------------------* 23b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * obtain dequantized lsf coefficients from quantization index 24b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org *---------------------------------------------------------------*/ 25b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 26b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgvoid WebRtcIlbcfix_SimpleLsfDeQ( 27fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *lsfdeq, /* (o) dequantized lsf coefficients */ 28fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *index, /* (i) quantization index */ 29fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t lpc_n /* (i) number of LPCs */ 30b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org ){ 31b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org int i, j, pos, cb_pos; 32b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 33b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* decode first LSF */ 34b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 35b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org pos = 0; 36b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org cb_pos = 0; 37b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for (i = 0; i < LSF_NSPLIT; i++) { 38b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for (j = 0; j < WebRtcIlbcfix_kLsfDimCb[i]; j++) { 39b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org lsfdeq[pos + j] = WebRtcIlbcfix_kLsfCb[cb_pos + 40b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WEBRTC_SPL_MUL_16_16(index[i], WebRtcIlbcfix_kLsfDimCb[i]) + j]; 41b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 42b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org pos += WebRtcIlbcfix_kLsfDimCb[i]; 43b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org cb_pos += WEBRTC_SPL_MUL_16_16(WebRtcIlbcfix_kLsfSizeCb[i], WebRtcIlbcfix_kLsfDimCb[i]); 44b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 45b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 46b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org if (lpc_n>1) { 47b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* decode last LSF */ 48b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org pos = 0; 49b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org cb_pos = 0; 50b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for (i = 0; i < LSF_NSPLIT; i++) { 51b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for (j = 0; j < WebRtcIlbcfix_kLsfDimCb[i]; j++) { 52b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org lsfdeq[LPC_FILTERORDER + pos + j] = WebRtcIlbcfix_kLsfCb[cb_pos + 53b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WEBRTC_SPL_MUL_16_16(index[LSF_NSPLIT + i], WebRtcIlbcfix_kLsfDimCb[i]) + j]; 54b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 55b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org pos += WebRtcIlbcfix_kLsfDimCb[i]; 56b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org cb_pos += WEBRTC_SPL_MUL_16_16(WebRtcIlbcfix_kLsfSizeCb[i], WebRtcIlbcfix_kLsfDimCb[i]); 57b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 58b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 59b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org return; 60b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org} 61