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_InitDecode.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 #include "constants.h" 21 22 /*----------------------------------------------------------------* 23 * Initiation of decoder instance. 24 *---------------------------------------------------------------*/ 25 26 int WebRtcIlbcfix_InitDecode( /* (o) Number of decoded samples */ 27 IlbcDecoder *iLBCdec_inst, /* (i/o) Decoder instance */ 28 int16_t mode, /* (i) frame size mode */ 29 int use_enhancer) { /* (i) 1: use enhancer, 0: no enhancer */ 30 int i; 31 32 iLBCdec_inst->mode = mode; 33 34 /* Set all the variables that are dependent on the frame size mode */ 35 if (mode==30) { 36 iLBCdec_inst->blockl = BLOCKL_30MS; 37 iLBCdec_inst->nsub = NSUB_30MS; 38 iLBCdec_inst->nasub = NASUB_30MS; 39 iLBCdec_inst->lpc_n = LPC_N_30MS; 40 iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS; 41 iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS; 42 iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS; 43 } 44 else if (mode==20) { 45 iLBCdec_inst->blockl = BLOCKL_20MS; 46 iLBCdec_inst->nsub = NSUB_20MS; 47 iLBCdec_inst->nasub = NASUB_20MS; 48 iLBCdec_inst->lpc_n = LPC_N_20MS; 49 iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS; 50 iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS; 51 iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS; 52 } 53 else { 54 return(-1); 55 } 56 57 /* Reset all the previous LSF to mean LSF */ 58 WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, WebRtcIlbcfix_kLsfMean, LPC_FILTERORDER); 59 60 /* Clear the synthesis filter memory */ 61 WebRtcSpl_MemSetW16(iLBCdec_inst->syntMem, 0, LPC_FILTERORDER); 62 63 /* Set the old synthesis filter to {1.0 0.0 ... 0.0} */ 64 WebRtcSpl_MemSetW16(iLBCdec_inst->old_syntdenum, 0, ((LPC_FILTERORDER + 1)*NSUB_MAX)); 65 for (i=0; i<NSUB_MAX; i++) { 66 iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)] = 4096; 67 } 68 69 /* Clear the variables that are used for the PLC */ 70 iLBCdec_inst->last_lag = 20; 71 iLBCdec_inst->consPLICount = 0; 72 iLBCdec_inst->prevPLI = 0; 73 iLBCdec_inst->perSquare = 0; 74 iLBCdec_inst->prevLag = 120; 75 iLBCdec_inst->prevLpc[0] = 4096; 76 WebRtcSpl_MemSetW16(iLBCdec_inst->prevLpc+1, 0, LPC_FILTERORDER); 77 WebRtcSpl_MemSetW16(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX); 78 79 /* Initialize the seed for the random number generator */ 80 iLBCdec_inst->seed = 777; 81 82 /* Set the filter state of the HP filter to 0 */ 83 WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemx, 0, 2); 84 WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemy, 0, 4); 85 86 /* Set the variables that are used in the ehnahcer */ 87 iLBCdec_inst->use_enhancer = use_enhancer; 88 WebRtcSpl_MemSetW16(iLBCdec_inst->enh_buf, 0, (ENH_BUFL+ENH_BUFL_FILTEROVERHEAD)); 89 for (i=0;i<ENH_NBLOCKS_TOT;i++) { 90 iLBCdec_inst->enh_period[i]=160; /* Q(-4) */ 91 } 92 93 iLBCdec_inst->prev_enh_pl = 0; 94 95 return (int)(iLBCdec_inst->blockl); 96 } 97
