mirror of
https://github.com/oxen-io/session-android.git
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d83a3d71bc
Merge in RedPhone // FREEBIE
520 lines
17 KiB
C
520 lines
17 KiB
C
/*
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* Copyright (c) 2012 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_Encode.c
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******************************************************************/
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#include <string.h>
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#include "defines.h"
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#include "lpc_encode.h"
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#include "frame_classify.h"
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#include "state_search.h"
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#include "state_construct.h"
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#include "constants.h"
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#include "cb_search.h"
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#include "cb_construct.h"
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#include "index_conv_enc.h"
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#include "pack_bits.h"
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#include "hp_input.h"
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#ifdef SPLIT_10MS
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#include "unpack_bits.h"
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#include "index_conv_dec.h"
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#endif
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#ifndef WEBRTC_ARCH_BIG_ENDIAN
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#include "swap_bytes.h"
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#endif
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/*----------------------------------------------------------------*
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* main encoder function
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_EncodeImpl(
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uint16_t *bytes, /* (o) encoded data bits iLBC */
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const int16_t *block, /* (i) speech vector to encode */
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iLBC_Enc_Inst_t *iLBCenc_inst /* (i/o) the general encoder
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state */
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){
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int n, meml_gotten, Nfor, Nback;
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int16_t diff, start_pos;
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int index;
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int subcount, subframe;
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int16_t start_count, end_count;
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int16_t *residual;
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int32_t en1, en2;
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int16_t scale, max;
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int16_t *syntdenum;
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int16_t *decresidual;
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int16_t *reverseResidual;
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int16_t *reverseDecresidual;
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/* Stack based */
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int16_t weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
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int16_t dataVec[BLOCKL_MAX + LPC_FILTERORDER];
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int16_t memVec[CB_MEML+CB_FILTERLEN];
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int16_t bitsMemory[sizeof(iLBC_bits)/sizeof(int16_t)];
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iLBC_bits *iLBCbits_inst = (iLBC_bits*)bitsMemory;
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#ifdef SPLIT_10MS
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int16_t *weightdenumbuf = iLBCenc_inst->weightdenumbuf;
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int16_t last_bit;
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#endif
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int16_t *data = &dataVec[LPC_FILTERORDER];
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int16_t *mem = &memVec[CB_HALFFILTERLEN];
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/* Reuse som buffers to save stack memory */
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residual = &iLBCenc_inst->lpc_buffer[LPC_LOOKBACK+BLOCKL_MAX-iLBCenc_inst->blockl];
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syntdenum = mem; /* syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX] and mem are used non overlapping in the code */
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decresidual = residual; /* Already encoded residual is overwritten by the decoded version */
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reverseResidual = data; /* data and reverseResidual are used non overlapping in the code */
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reverseDecresidual = reverseResidual; /* Already encoded residual is overwritten by the decoded version */
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#ifdef SPLIT_10MS
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WebRtcSpl_MemSetW16 ( (int16_t *) iLBCbits_inst, 0,
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(int16_t) (sizeof(iLBC_bits) / sizeof(int16_t)) );
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start_pos = iLBCenc_inst->start_pos;
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diff = iLBCenc_inst->diff;
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if (iLBCenc_inst->section != 0){
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WEBRTC_SPL_MEMCPY_W16 (weightdenum, weightdenumbuf,
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SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
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/* Un-Packetize the frame into parameters */
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last_bit = WebRtcIlbcfix_UnpackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
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if (last_bit)
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return;
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/* adjust index */
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WebRtcIlbcfix_IndexConvDec (iLBCbits_inst->cb_index);
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if (iLBCenc_inst->section == 1){
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/* Save first 80 samples of a 160/240 sample frame for 20/30msec */
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WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples, block, 80);
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}
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else{ // iLBCenc_inst->section == 2 AND mode = 30ms
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/* Save second 80 samples of a 240 sample frame for 30msec */
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WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples + 80, block, 80);
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}
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}
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else{ // iLBCenc_inst->section == 0
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/* form a complete frame of 160/240 for 20msec/30msec mode */
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WEBRTC_SPL_MEMCPY_W16 (data + (iLBCenc_inst->mode * 8) - 80, block, 80);
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WEBRTC_SPL_MEMCPY_W16 (data, iLBCenc_inst->past_samples,
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(iLBCenc_inst->mode * 8) - 80);
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iLBCenc_inst->Nfor_flag = 0;
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iLBCenc_inst->Nback_flag = 0;
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#else
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/* copy input block to data*/
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WEBRTC_SPL_MEMCPY_W16(data,block,iLBCenc_inst->blockl);
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#endif
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/* high pass filtering of input signal and scale down the residual (*0.5) */
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WebRtcIlbcfix_HpInput(data, (int16_t*)WebRtcIlbcfix_kHpInCoefs,
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iLBCenc_inst->hpimemy, iLBCenc_inst->hpimemx,
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iLBCenc_inst->blockl);
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/* LPC of hp filtered input data */
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WebRtcIlbcfix_LpcEncode(syntdenum, weightdenum, iLBCbits_inst->lsf, data,
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iLBCenc_inst);
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/* Set up state */
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WEBRTC_SPL_MEMCPY_W16(dataVec, iLBCenc_inst->anaMem, LPC_FILTERORDER);
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/* inverse filter to get residual */
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for (n=0; n<iLBCenc_inst->nsub; n++ ) {
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WebRtcSpl_FilterMAFastQ12(
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&data[n*SUBL], &residual[n*SUBL],
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&syntdenum[n*(LPC_FILTERORDER+1)],
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LPC_FILTERORDER+1, SUBL);
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}
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/* Copy the state for next frame */
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WEBRTC_SPL_MEMCPY_W16(iLBCenc_inst->anaMem, &data[iLBCenc_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER);
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/* find state location */
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iLBCbits_inst->startIdx = WebRtcIlbcfix_FrameClassify(iLBCenc_inst,residual);
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/* check if state should be in first or last part of the
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two subframes */
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index = (iLBCbits_inst->startIdx-1)*SUBL;
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max=WebRtcSpl_MaxAbsValueW16(&residual[index], 2*SUBL);
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scale=WebRtcSpl_GetSizeInBits(WEBRTC_SPL_MUL_16_16(max,max));
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/* Scale to maximum 25 bits so that the MAC won't cause overflow */
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scale = scale - 25;
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if(scale < 0) {
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scale = 0;
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}
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diff = STATE_LEN - iLBCenc_inst->state_short_len;
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en1=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index],
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iLBCenc_inst->state_short_len, scale);
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index += diff;
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en2=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index],
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iLBCenc_inst->state_short_len, scale);
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if (en1 > en2) {
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iLBCbits_inst->state_first = 1;
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start_pos = (iLBCbits_inst->startIdx-1)*SUBL;
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} else {
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iLBCbits_inst->state_first = 0;
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start_pos = (iLBCbits_inst->startIdx-1)*SUBL + diff;
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}
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/* scalar quantization of state */
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WebRtcIlbcfix_StateSearch(iLBCenc_inst, iLBCbits_inst, &residual[start_pos],
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&syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
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&weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)]);
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WebRtcIlbcfix_StateConstruct(iLBCbits_inst->idxForMax, iLBCbits_inst->idxVec,
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&syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
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&decresidual[start_pos], iLBCenc_inst->state_short_len
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);
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/* predictive quantization in state */
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if (iLBCbits_inst->state_first) { /* put adaptive part in the end */
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/* setup memory */
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WebRtcSpl_MemSetW16(mem, 0, (int16_t)(CB_MEML-iLBCenc_inst->state_short_len));
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WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-iLBCenc_inst->state_short_len,
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decresidual+start_pos, iLBCenc_inst->state_short_len);
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/* encode subframes */
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WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
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&residual[start_pos+iLBCenc_inst->state_short_len],
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mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff,
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&weightdenum[iLBCbits_inst->startIdx*(LPC_FILTERORDER+1)], 0);
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/* construct decoded vector */
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WebRtcIlbcfix_CbConstruct(&decresidual[start_pos+iLBCenc_inst->state_short_len],
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iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
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mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL,
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diff
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);
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}
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else { /* put adaptive part in the beginning */
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/* create reversed vectors for prediction */
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WebRtcSpl_MemCpyReversedOrder(&reverseResidual[diff-1],
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&residual[(iLBCbits_inst->startIdx+1)*SUBL-STATE_LEN], diff);
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/* setup memory */
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meml_gotten = iLBCenc_inst->state_short_len;
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WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[start_pos], meml_gotten);
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WebRtcSpl_MemSetW16(mem, 0, (int16_t)(CB_MEML-iLBCenc_inst->state_short_len));
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/* encode subframes */
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WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
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reverseResidual, mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff,
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&weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
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0);
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/* construct decoded vector */
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WebRtcIlbcfix_CbConstruct(reverseDecresidual,
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iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
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mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL,
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diff
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);
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/* get decoded residual from reversed vector */
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WebRtcSpl_MemCpyReversedOrder(&decresidual[start_pos-1], reverseDecresidual, diff);
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}
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#ifdef SPLIT_10MS
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iLBCenc_inst->start_pos = start_pos;
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iLBCenc_inst->diff = diff;
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iLBCenc_inst->section++;
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/* adjust index */
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WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index);
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/* Packetize the parameters into the frame */
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WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
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WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
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SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
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return;
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}
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#endif
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/* forward prediction of subframes */
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Nfor = iLBCenc_inst->nsub-iLBCbits_inst->startIdx-1;
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/* counter for predicted subframes */
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#ifdef SPLIT_10MS
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if (iLBCenc_inst->mode == 20)
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{
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subcount = 1;
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}
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if (iLBCenc_inst->mode == 30)
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{
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if (iLBCenc_inst->section == 1)
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{
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subcount = 1;
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}
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if (iLBCenc_inst->section == 2)
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{
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subcount = 3;
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}
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}
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#else
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subcount=1;
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#endif
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if( Nfor > 0 ){
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/* setup memory */
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WebRtcSpl_MemSetW16(mem, 0, CB_MEML-STATE_LEN);
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WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-STATE_LEN,
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decresidual+(iLBCbits_inst->startIdx-1)*SUBL, STATE_LEN);
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#ifdef SPLIT_10MS
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if (iLBCenc_inst->Nfor_flag > 0)
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{
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for (subframe = 0; subframe < WEBRTC_SPL_MIN (Nfor, 2); subframe++)
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{
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/* update memory */
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WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL));
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WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL,
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&decresidual[(iLBCbits_inst->startIdx + 1 +
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subframe) * SUBL], SUBL);
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}
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}
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iLBCenc_inst->Nfor_flag++;
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if (iLBCenc_inst->mode == 20)
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{
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start_count = 0;
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end_count = Nfor;
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}
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if (iLBCenc_inst->mode == 30)
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{
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if (iLBCenc_inst->section == 1)
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{
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start_count = 0;
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end_count = WEBRTC_SPL_MIN (Nfor, 2);
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}
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if (iLBCenc_inst->section == 2)
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{
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start_count = WEBRTC_SPL_MIN (Nfor, 2);
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end_count = Nfor;
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}
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}
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#else
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start_count = 0;
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end_count = (int16_t)Nfor;
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#endif
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/* loop over subframes to encode */
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for (subframe = start_count; subframe < end_count; subframe++){
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/* encode subframe */
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WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
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iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
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&residual[(iLBCbits_inst->startIdx+1+subframe)*SUBL],
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mem, MEM_LF_TBL, SUBL,
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&weightdenum[(iLBCbits_inst->startIdx+1+subframe)*(LPC_FILTERORDER+1)],
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(int16_t)subcount);
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/* construct decoded vector */
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WebRtcIlbcfix_CbConstruct(&decresidual[(iLBCbits_inst->startIdx+1+subframe)*SUBL],
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iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
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iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
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mem, MEM_LF_TBL,
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SUBL
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);
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/* update memory */
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memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem));
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WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL,
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&decresidual[(iLBCbits_inst->startIdx+1+subframe)*SUBL], SUBL);
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subcount++;
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}
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}
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#ifdef SPLIT_10MS
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if ((iLBCenc_inst->section == 1) &&
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(iLBCenc_inst->mode == 30) && (Nfor > 0) && (end_count == 2))
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{
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iLBCenc_inst->section++;
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/* adjust index */
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WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index);
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/* Packetize the parameters into the frame */
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WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
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WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
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SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
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return;
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}
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#endif
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/* backward prediction of subframes */
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Nback = iLBCbits_inst->startIdx-1;
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if( Nback > 0 ){
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/* create reverse order vectors
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(The decresidual does not need to be copied since it is
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contained in the same vector as the residual)
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*/
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WebRtcSpl_MemCpyReversedOrder(&reverseResidual[Nback*SUBL-1], residual, Nback*SUBL);
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/* setup memory */
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meml_gotten = SUBL*(iLBCenc_inst->nsub+1-iLBCbits_inst->startIdx);
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if( meml_gotten > CB_MEML ) {
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meml_gotten=CB_MEML;
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}
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WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[Nback*SUBL], meml_gotten);
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WebRtcSpl_MemSetW16(mem, 0, (int16_t)(CB_MEML-meml_gotten));
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#ifdef SPLIT_10MS
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if (iLBCenc_inst->Nback_flag > 0)
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{
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for (subframe = 0; subframe < WEBRTC_SPL_MAX (2 - Nfor, 0); subframe++)
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{
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/* update memory */
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WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL));
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WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL,
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&reverseDecresidual[subframe * SUBL], SUBL);
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}
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}
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iLBCenc_inst->Nback_flag++;
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if (iLBCenc_inst->mode == 20)
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{
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start_count = 0;
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end_count = Nback;
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}
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if (iLBCenc_inst->mode == 30)
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{
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if (iLBCenc_inst->section == 1)
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{
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start_count = 0;
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end_count = WEBRTC_SPL_MAX (2 - Nfor, 0);
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}
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if (iLBCenc_inst->section == 2)
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{
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start_count = WEBRTC_SPL_MAX (2 - Nfor, 0);
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end_count = Nback;
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}
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}
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#else
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start_count = 0;
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end_count = (int16_t)Nback;
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#endif
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/* loop over subframes to encode */
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for (subframe = start_count; subframe < end_count; subframe++){
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/* encode subframe */
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WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
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iLBCbits_inst->gain_index+subcount*CB_NSTAGES, &reverseResidual[subframe*SUBL],
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mem, MEM_LF_TBL, SUBL,
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&weightdenum[(iLBCbits_inst->startIdx-2-subframe)*(LPC_FILTERORDER+1)],
|
|
(int16_t)subcount);
|
|
|
|
/* construct decoded vector */
|
|
|
|
WebRtcIlbcfix_CbConstruct(&reverseDecresidual[subframe*SUBL],
|
|
iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
|
|
iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
|
|
mem, MEM_LF_TBL, SUBL
|
|
);
|
|
|
|
/* update memory */
|
|
memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem));
|
|
WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL,
|
|
&reverseDecresidual[subframe*SUBL], SUBL);
|
|
|
|
subcount++;
|
|
|
|
}
|
|
|
|
/* get decoded residual from reversed vector */
|
|
|
|
WebRtcSpl_MemCpyReversedOrder(&decresidual[SUBL*Nback-1], reverseDecresidual, SUBL*Nback);
|
|
}
|
|
/* end encoding part */
|
|
|
|
/* adjust index */
|
|
|
|
WebRtcIlbcfix_IndexConvEnc(iLBCbits_inst->cb_index);
|
|
|
|
/* Packetize the parameters into the frame */
|
|
|
|
#ifdef SPLIT_10MS
|
|
if( (iLBCenc_inst->mode==30) && (iLBCenc_inst->section==1) ){
|
|
WebRtcIlbcfix_PackBits(iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
|
|
}
|
|
else{
|
|
WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode);
|
|
}
|
|
#else
|
|
WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode);
|
|
#endif
|
|
|
|
#ifndef WEBRTC_ARCH_BIG_ENDIAN
|
|
/* Swap bytes for LITTLE ENDIAN since the packbits()
|
|
function assumes BIG_ENDIAN machine */
|
|
#ifdef SPLIT_10MS
|
|
if (( (iLBCenc_inst->section == 1) && (iLBCenc_inst->mode == 20) ) ||
|
|
( (iLBCenc_inst->section == 2) && (iLBCenc_inst->mode == 30) )){
|
|
WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes);
|
|
}
|
|
#else
|
|
WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes);
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef SPLIT_10MS
|
|
if (subcount == (iLBCenc_inst->nsub - 1))
|
|
{
|
|
iLBCenc_inst->section = 0;
|
|
}
|
|
else
|
|
{
|
|
iLBCenc_inst->section++;
|
|
WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
|
|
SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
|
|
}
|
|
#endif
|
|
|
|
}
|