1b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/* 2b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * 4b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Use of this source code is governed by a BSD-style license 5b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * that can be found in the LICENSE file in the root of the source 6b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * tree. An additional intellectual property rights grant can be found 7b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * in the file PATENTS. All contributing project authors may 8b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * be found in the AUTHORS file in the root of the source tree. 9b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org */ 10b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 11b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/****************************************************************** 12b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 13b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC Speech Coder ANSI-C Source Code 14b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 15b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_GetSyncSeq.c 16b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 17b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org******************************************************************/ 18b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 19b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "defines.h" 20b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "constants.h" 21b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "refiner.h" 22b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "nearest_neighbor.h" 23b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 24b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/*----------------------------------------------------------------* 25b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * get the pitch-synchronous sample sequence 26b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org *---------------------------------------------------------------*/ 27b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 28b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgvoid WebRtcIlbcfix_GetSyncSeq( 29fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *idata, /* (i) original data */ 30fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t idatal, /* (i) dimension of data */ 31fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t centerStartPos, /* (i) where current block starts */ 32fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *period, /* (i) rough-pitch-period array (Q-2) */ 33fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *plocs, /* (i) where periods of period array are taken (Q-2) */ 34fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t periodl, /* (i) dimension period array */ 35fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t hl, /* (i) 2*hl+1 is the number of sequences */ 36fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *surround /* (i/o) The contribution from this sequence 37b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org summed with earlier contributions */ 38b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org ){ 39fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t i,centerEndPos,q; 40b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Stack based */ 41fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t lagBlock[2*ENH_HL+1]; 42fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t blockStartPos[2*ENH_HL+1]; /* Defines the position to search around (Q2) */ 43fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t plocs2[ENH_PLOCSL]; 44b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 45b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org centerEndPos=centerStartPos+ENH_BLOCKL-1; 46b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 47b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* present (find predicted lag from this position) */ 48b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 49b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_NearestNeighbor(lagBlock+hl,plocs, 50fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t)WEBRTC_SPL_MUL_16_16(2, (centerStartPos+centerEndPos)), 51b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org periodl); 52b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 53fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org blockStartPos[hl]=(int16_t)WEBRTC_SPL_MUL_16_16(4, centerStartPos); 54b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 55b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* past (find predicted position and perform a refined 56b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org search to find the best sequence) */ 57b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 58b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for(q=hl-1;q>=0;q--) { 59b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org blockStartPos[q]=blockStartPos[q+1]-period[lagBlock[q+1]]; 60b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 61b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_NearestNeighbor(lagBlock+q, plocs, 62fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t)(blockStartPos[q] + (int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)-period[lagBlock[q+1]]), 63b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org periodl); 64b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 65fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org if((blockStartPos[q]-(int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_OVERHANG))>=0) { 66b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 67b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Find the best possible sequence in the 4 times upsampled 68b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org domain around blockStartPos+q */ 69b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_Refiner(blockStartPos+q,idata,idatal, 70b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[q]); 71b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 72b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } else { 73b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Don't add anything since this sequence would 74b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org be outside the buffer */ 75b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 76b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 77b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 78b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* future (find predicted position and perform a refined 79b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org search to find the best sequence) */ 80b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 81b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for(i=0;i<periodl;i++) { 82b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org plocs2[i]=(plocs[i]-period[i]); 83b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 84b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 85b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org for(q=hl+1;q<=WEBRTC_SPL_MUL_16_16(2, hl);q++) { 86b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 87b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_NearestNeighbor(lagBlock+q,plocs2, 88fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t)(blockStartPos[q-1]+ 89fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)),periodl); 90b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 91b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org blockStartPos[q]=blockStartPos[q-1]+period[lagBlock[q]]; 92b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 93fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org if( (blockStartPos[q]+(int16_t)WEBRTC_SPL_MUL_16_16(4, (ENH_BLOCKL+ENH_OVERHANG))) 94b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org < 95fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t)WEBRTC_SPL_MUL_16_16(4, idatal)) { 96b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 97b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Find the best possible sequence in the 4 times upsampled 98b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org domain around blockStartPos+q */ 99b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_Refiner(blockStartPos+q, idata, idatal, 100b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[2*hl-q]); 101b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 102b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 103b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org else { 104b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Don't add anything since this sequence would 105b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org be outside the buffer */ 106b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 107b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 108b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org} 109