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_AbsQuant.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#include "abs_quant_loop.h" 22b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 23b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 24b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/*----------------------------------------------------------------* 25b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * predictive noise shaping encoding of scaled start state 26b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * (subrutine for WebRtcIlbcfix_StateSearch) 27b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org *---------------------------------------------------------------*/ 28b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 29b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgvoid WebRtcIlbcfix_AbsQuant( 30b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC_Enc_Inst_t *iLBCenc_inst, 31b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* (i) Encoder instance */ 32b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC_bits *iLBC_encbits, /* (i/o) Encoded bits (outputs idxForMax 33b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org and idxVec, uses state_first as 34b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org input) */ 35fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *in, /* (i) vector to encode */ 36fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *weightDenum /* (i) denominator of synthesis filter */ 37b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org ) { 38fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *syntOut; 39fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t quantLen[2]; 40b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 41b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Stack based */ 42fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS]; 43fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t in_weightedVec[STATE_SHORT_LEN_30MS+LPC_FILTERORDER]; 44fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *in_weighted = &in_weightedVec[LPC_FILTERORDER]; 45b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 46b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Initialize the buffers */ 47b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_MemSetW16(syntOutBuf, 0, LPC_FILTERORDER+STATE_SHORT_LEN_30MS); 48b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org syntOut = &syntOutBuf[LPC_FILTERORDER]; 49b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Start with zero state */ 50b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_MemSetW16(in_weightedVec, 0, LPC_FILTERORDER); 51b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 52b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Perform the quantization loop in two sections of length quantLen[i], 53b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org where the perceptual weighting filter is updated at the subframe 54b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org border */ 55b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 56b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org if (iLBC_encbits->state_first) { 57b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org quantLen[0]=SUBL; 58b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org quantLen[1]=iLBCenc_inst->state_short_len-SUBL; 59b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } else { 60b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org quantLen[0]=iLBCenc_inst->state_short_len-SUBL; 61b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org quantLen[1]=SUBL; 62b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 63b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 64b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Calculate the weighted residual, switch perceptual weighting 65b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org filter at the subframe border */ 66b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_FilterARFastQ12( 67b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org in, in_weighted, 68b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org weightDenum, LPC_FILTERORDER+1, quantLen[0]); 69b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_FilterARFastQ12( 70b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org &in[quantLen[0]], &in_weighted[quantLen[0]], 71b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org &weightDenum[LPC_FILTERORDER+1], LPC_FILTERORDER+1, quantLen[1]); 72b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 73b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_AbsQuantLoop( 74b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org syntOut, 75b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org in_weighted, 76b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org weightDenum, 77b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org quantLen, 78b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC_encbits->idxVec); 79b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 80b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org} 81