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68 lines
2.2 KiB
C
68 lines
2.2 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_CbConstruct.c
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******************************************************************/
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#include "defines.h"
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#include "gain_dequant.h"
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#include "get_cd_vec.h"
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/*----------------------------------------------------------------*
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* Construct decoded vector from codebook and gains.
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_CbConstruct(
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int16_t *decvector, /* (o) Decoded vector */
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int16_t *index, /* (i) Codebook indices */
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int16_t *gain_index, /* (i) Gain quantization indices */
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int16_t *mem, /* (i) Buffer for codevector construction */
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int16_t lMem, /* (i) Length of buffer */
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int16_t veclen /* (i) Length of vector */
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){
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int j;
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int16_t gain[CB_NSTAGES];
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/* Stack based */
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int16_t cbvec0[SUBL];
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int16_t cbvec1[SUBL];
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int16_t cbvec2[SUBL];
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int32_t a32;
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int16_t *gainPtr;
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/* gain de-quantization */
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gain[0] = WebRtcIlbcfix_GainDequant(gain_index[0], 16384, 0);
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gain[1] = WebRtcIlbcfix_GainDequant(gain_index[1], gain[0], 1);
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gain[2] = WebRtcIlbcfix_GainDequant(gain_index[2], gain[1], 2);
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/* codebook vector construction and construction of total vector */
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/* Stack based */
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WebRtcIlbcfix_GetCbVec(cbvec0, mem, index[0], lMem, veclen);
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WebRtcIlbcfix_GetCbVec(cbvec1, mem, index[1], lMem, veclen);
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WebRtcIlbcfix_GetCbVec(cbvec2, mem, index[2], lMem, veclen);
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gainPtr = &gain[0];
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for (j=0;j<veclen;j++) {
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a32 = WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec0[j]);
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a32 += WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec1[j]);
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a32 += WEBRTC_SPL_MUL_16_16(*gainPtr, cbvec2[j]);
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gainPtr -= 2;
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decvector[j] = (int16_t) WEBRTC_SPL_RSHIFT_W32(a32 + 8192, 14);
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}
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return;
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}
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