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81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_AbsQuant.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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#include "abs_quant_loop.h"
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/*----------------------------------------------------------------*
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* predictive noise shaping encoding of scaled start state
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* (subrutine for WebRtcIlbcfix_StateSearch)
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_AbsQuant(
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iLBC_Enc_Inst_t *iLBCenc_inst,
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/* (i) Encoder instance */
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iLBC_bits *iLBC_encbits, /* (i/o) Encoded bits (outputs idxForMax
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and idxVec, uses state_first as
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input) */
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int16_t *in, /* (i) vector to encode */
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int16_t *weightDenum /* (i) denominator of synthesis filter */
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) {
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int16_t *syntOut;
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int16_t quantLen[2];
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/* Stack based */
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int16_t syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS];
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int16_t in_weightedVec[STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t *in_weighted = &in_weightedVec[LPC_FILTERORDER];
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/* Initialize the buffers */
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WebRtcSpl_MemSetW16(syntOutBuf, 0, LPC_FILTERORDER+STATE_SHORT_LEN_30MS);
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syntOut = &syntOutBuf[LPC_FILTERORDER];
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/* Start with zero state */
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WebRtcSpl_MemSetW16(in_weightedVec, 0, LPC_FILTERORDER);
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/* Perform the quantization loop in two sections of length quantLen[i],
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where the perceptual weighting filter is updated at the subframe
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border */
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if (iLBC_encbits->state_first) {
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quantLen[0]=SUBL;
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quantLen[1]=iLBCenc_inst->state_short_len-SUBL;
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} else {
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quantLen[0]=iLBCenc_inst->state_short_len-SUBL;
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quantLen[1]=SUBL;
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}
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/* Calculate the weighted residual, switch perceptual weighting
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filter at the subframe border */
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WebRtcSpl_FilterARFastQ12(
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in, in_weighted,
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weightDenum, LPC_FILTERORDER+1, quantLen[0]);
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WebRtcSpl_FilterARFastQ12(
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&in[quantLen[0]], &in_weighted[quantLen[0]],
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&weightDenum[LPC_FILTERORDER+1], LPC_FILTERORDER+1, quantLen[1]);
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WebRtcIlbcfix_AbsQuantLoop(
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syntOut,
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in_weighted,
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weightDenum,
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quantLen,
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iLBC_encbits->idxVec);
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}
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