1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /****************************************************************** 12 13 iLBC Speech Coder ANSI-C Source Code 14 15 WebRtcIlbcfix_CbMemEnergy.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 #include "constants.h" 21 #include "cb_mem_energy_calc.h" 22 23 /*----------------------------------------------------------------* 24 * Function WebRtcIlbcfix_CbMemEnergy computes the energy of all 25 * the vectors in the codebook memory that will be used in the 26 * following search for the best match. 27 *----------------------------------------------------------------*/ 28 29 void WebRtcIlbcfix_CbMemEnergy( 30 int16_t range, 31 int16_t *CB, /* (i) The CB memory (1:st section) */ 32 int16_t *filteredCB, /* (i) The filtered CB memory (2:nd section) */ 33 int16_t lMem, /* (i) Length of the CB memory */ 34 int16_t lTarget, /* (i) Length of the target vector */ 35 int16_t *energyW16, /* (o) Energy in the CB vectors */ 36 int16_t *energyShifts, /* (o) Shift value of the energy */ 37 int16_t scale, /* (i) The scaling of all energy values */ 38 int16_t base_size /* (i) Index to where the energy values should be stored */ 39 ) { 40 int16_t *ppi, *ppo, *pp; 41 int32_t energy, tmp32; 42 43 /* Compute the energy and store it in a vector. Also the 44 * corresponding shift values are stored. The energy values 45 * are reused in all three stages. */ 46 47 /* Calculate the energy in the first block of 'lTarget' sampels. */ 48 ppi = CB+lMem-lTarget-1; 49 ppo = CB+lMem-1; 50 51 pp=CB+lMem-lTarget; 52 energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale); 53 54 /* Normalize the energy and store the number of shifts */ 55 energyShifts[0] = (int16_t)WebRtcSpl_NormW32(energy); 56 tmp32 = WEBRTC_SPL_LSHIFT_W32(energy, energyShifts[0]); 57 energyW16[0] = (int16_t)WEBRTC_SPL_RSHIFT_W32(tmp32, 16); 58 59 /* Compute the energy of the rest of the cb memory 60 * by step wise adding and subtracting the next 61 * sample and the last sample respectively. */ 62 WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, 0); 63 64 /* Next, precompute the energy values for the filtered cb section */ 65 energy=0; 66 pp=filteredCB+lMem-lTarget; 67 68 energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale); 69 70 /* Normalize the energy and store the number of shifts */ 71 energyShifts[base_size] = (int16_t)WebRtcSpl_NormW32(energy); 72 tmp32 = WEBRTC_SPL_LSHIFT_W32(energy, energyShifts[base_size]); 73 energyW16[base_size] = (int16_t)WEBRTC_SPL_RSHIFT_W32(tmp32, 16); 74 75 ppi = filteredCB + lMem - 1 - lTarget; 76 ppo = filteredCB + lMem - 1; 77 78 WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, base_size); 79 } 80
