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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}
65 lines
1.9 KiB
C
65 lines
1.9 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_CbMemEnergyCalc.c
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******************************************************************/
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#include "defines.h"
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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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void WebRtcIlbcfix_CbMemEnergyCalc(
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int32_t energy, /* (i) input start energy */
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size_t range, /* (i) number of iterations */
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int16_t *ppi, /* (i) input pointer 1 */
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int16_t *ppo, /* (i) input pointer 2 */
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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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{
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size_t j;
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int16_t shft;
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int32_t tmp;
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int16_t *eSh_ptr;
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int16_t *eW16_ptr;
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eSh_ptr = &energyShifts[1+base_size];
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eW16_ptr = &energyW16[1+base_size];
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for (j = 0; j + 1 < range; j++) {
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/* Calculate next energy by a +/-
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operation on the edge samples */
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tmp = (*ppi) * (*ppi) - (*ppo) * (*ppo);
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energy += tmp >> scale;
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energy = WEBRTC_SPL_MAX(energy, 0);
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ppi--;
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ppo--;
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/* Normalize the energy into a int16_t and store
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the number of shifts */
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shft = (int16_t)WebRtcSpl_NormW32(energy);
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*eSh_ptr++ = shft;
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tmp = energy << shft;
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*eW16_ptr++ = (int16_t)(tmp >> 16);
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}
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}
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