mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-30 19:57:45 +00:00
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
|
/*
|
||
|
|
* 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) */
|
||
|
|
int16_t *in, /* (i) vector to encode */
|
||
|
|
int16_t *weightDenum /* (i) denominator of synthesis filter */
|
||
|
|
) {
|
||
|
|
int16_t *syntOut;
|
||
|
|
int16_t quantLen[2];
|
||
|
|
|
||
|
|
/* Stack based */
|
||
|
|
int16_t syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS];
|
||
|
|
int16_t in_weightedVec[STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
|
||
|
|
int16_t *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);
|
||
|
|
|
||
|
|
}
|