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bb547203bf
In order to eliminate the WebRTC Subtree mirror in Chromium, WebRTC is moving the content of the src/webrtc directory up to the src/ directory. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38 Reviewed-on: https://webrtc-review.googlesource.com/1560 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19845}
79 lines
3 KiB
C
79 lines
3 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_CbMemEnergy.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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#include "cb_mem_energy_calc.h"
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/*----------------------------------------------------------------*
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* Function WebRtcIlbcfix_CbMemEnergy computes the energy of all
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* the vectors in the codebook memory that will be used in the
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* following search for the best match.
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*----------------------------------------------------------------*/
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void WebRtcIlbcfix_CbMemEnergy(
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size_t range,
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int16_t *CB, /* (i) The CB memory (1:st section) */
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int16_t *filteredCB, /* (i) The filtered CB memory (2:nd section) */
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size_t lMem, /* (i) Length of the CB memory */
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size_t lTarget, /* (i) Length of the target vector */
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int16_t *energyW16, /* (o) Energy in the CB vectors */
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int16_t *energyShifts, /* (o) Shift value of the energy */
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int scale, /* (i) The scaling of all energy values */
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size_t base_size /* (i) Index to where energy values should be stored */
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) {
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int16_t *ppi, *ppo, *pp;
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int32_t energy, tmp32;
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/* Compute the energy and store it in a vector. Also the
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* corresponding shift values are stored. The energy values
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* are reused in all three stages. */
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/* Calculate the energy in the first block of 'lTarget' sampels. */
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ppi = CB+lMem-lTarget-1;
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ppo = CB+lMem-1;
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pp=CB+lMem-lTarget;
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energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale);
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/* Normalize the energy and store the number of shifts */
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energyShifts[0] = (int16_t)WebRtcSpl_NormW32(energy);
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tmp32 = energy << energyShifts[0];
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energyW16[0] = (int16_t)(tmp32 >> 16);
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/* Compute the energy of the rest of the cb memory
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* by step wise adding and subtracting the next
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* sample and the last sample respectively. */
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WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, 0);
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/* Next, precompute the energy values for the filtered cb section */
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energy=0;
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pp=filteredCB+lMem-lTarget;
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energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale);
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/* Normalize the energy and store the number of shifts */
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energyShifts[base_size] = (int16_t)WebRtcSpl_NormW32(energy);
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tmp32 = energy << energyShifts[base_size];
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energyW16[base_size] = (int16_t)(tmp32 >> 16);
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ppi = filteredCB + lMem - 1 - lTarget;
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ppo = filteredCB + lMem - 1;
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WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, base_size);
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}
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