| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| /****************************************************************** |
| |
| iLBC Speech Coder ANSI-C Source Code |
| |
| WebRtcIlbcfix_AbsQuant.c |
| |
| ******************************************************************/ |
| |
| #include "defines.h" |
| #include "constants.h" |
| #include "abs_quant_loop.h" |
| |
| |
| /*----------------------------------------------------------------* |
| * predictive noise shaping encoding of scaled start state |
| * (subrutine for WebRtcIlbcfix_StateSearch) |
| *---------------------------------------------------------------*/ |
| |
| void WebRtcIlbcfix_AbsQuant( |
| iLBC_Enc_Inst_t *iLBCenc_inst, |
| /* (i) Encoder instance */ |
| iLBC_bits *iLBC_encbits, /* (i/o) Encoded bits (outputs idxForMax |
| and idxVec, uses state_first as |
| input) */ |
| WebRtc_Word16 *in, /* (i) vector to encode */ |
| WebRtc_Word16 *weightDenum /* (i) denominator of synthesis filter */ |
| ) { |
| WebRtc_Word16 *syntOut; |
| WebRtc_Word16 quantLen[2]; |
| |
| /* Stack based */ |
| WebRtc_Word16 syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS]; |
| WebRtc_Word16 in_weightedVec[STATE_SHORT_LEN_30MS+LPC_FILTERORDER]; |
| WebRtc_Word16 *in_weighted = &in_weightedVec[LPC_FILTERORDER]; |
| |
| /* Initialize the buffers */ |
| WebRtcSpl_MemSetW16(syntOutBuf, 0, LPC_FILTERORDER+STATE_SHORT_LEN_30MS); |
| syntOut = &syntOutBuf[LPC_FILTERORDER]; |
| /* Start with zero state */ |
| WebRtcSpl_MemSetW16(in_weightedVec, 0, LPC_FILTERORDER); |
| |
| /* Perform the quantization loop in two sections of length quantLen[i], |
| where the perceptual weighting filter is updated at the subframe |
| border */ |
| |
| if (iLBC_encbits->state_first) { |
| quantLen[0]=SUBL; |
| quantLen[1]=iLBCenc_inst->state_short_len-SUBL; |
| } else { |
| quantLen[0]=iLBCenc_inst->state_short_len-SUBL; |
| quantLen[1]=SUBL; |
| } |
| |
| /* Calculate the weighted residual, switch perceptual weighting |
| filter at the subframe border */ |
| WebRtcSpl_FilterARFastQ12( |
| in, in_weighted, |
| weightDenum, LPC_FILTERORDER+1, quantLen[0]); |
| WebRtcSpl_FilterARFastQ12( |
| &in[quantLen[0]], &in_weighted[quantLen[0]], |
| &weightDenum[LPC_FILTERORDER+1], LPC_FILTERORDER+1, quantLen[1]); |
| |
| WebRtcIlbcfix_AbsQuantLoop( |
| syntOut, |
| in_weighted, |
| weightDenum, |
| quantLen, |
| iLBC_encbits->idxVec); |
| |
| } |