b7e5054414
This makes a variety of small changes to synchronize bits of code using different types, remove useless code or casts, and add explicit casts in some places previously doing implicit ones. For example: * Change a few type declarations to better match how the majority of code uses those objects. * Eliminate "< 0" check for unsigned values. * Replace "(float)sin(x)", where |x| is also a float, with "sinf(x)", and similar. * Add casts to uint32_t in many places timestamps were used and the existing code stored signed values into the unsigned objects. * Remove downcasts when the results would be passed to a larger type, e.g. calling "foo((int16_t)x)" with an int |x| when foo() takes an int instead of an int16_t. * Similarly, add casts when passing a larger type to a function taking a smaller one. * Add casts to int16_t when doing something like "int16_t = int16_t + int16_t" as the "+" operation would implicitly upconvert to int, and similar. * Use "false" instead of "0" for setting a bool. * Shift a few temp types when doing a multi-stage calculation involving typecasts, so as to put the most logical/semantically correct type possible into the temps. For example, when doing "int foo = int + int; size_t bar = (size_t)foo + size_t;", we might change |foo| to a size_t and move the cast if it makes more sense for |foo| to be represented as a size_t. BUG=none R=andrew@webrtc.org, asapersson@webrtc.org, henrika@webrtc.org, juberti@webrtc.org, kwiberg@webrtc.org TBR=andrew, asapersson, henrika Review URL: https://codereview.webrtc.org/1168753002 Cr-Commit-Position: refs/heads/master@{#9419}
115 lines
3.6 KiB
C
115 lines
3.6 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_StateConstruct.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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/*----------------------------------------------------------------*
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* decoding of the start state
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_StateConstruct(
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int16_t idxForMax, /* (i) 6-bit index for the quantization of
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max amplitude */
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int16_t *idxVec, /* (i) vector of quantization indexes */
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int16_t *syntDenum, /* (i) synthesis filter denumerator */
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int16_t *Out_fix, /* (o) the decoded state vector */
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int16_t len /* (i) length of a state vector */
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) {
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int k;
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int16_t maxVal;
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int16_t *tmp1, *tmp2, *tmp3;
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/* Stack based */
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int16_t numerator[1+LPC_FILTERORDER];
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int16_t sampleValVec[2*STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t sampleMaVec[2*STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t *sampleVal = &sampleValVec[LPC_FILTERORDER];
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int16_t *sampleMa = &sampleMaVec[LPC_FILTERORDER];
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int16_t *sampleAr = &sampleValVec[LPC_FILTERORDER];
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/* initialization of coefficients */
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for (k=0; k<LPC_FILTERORDER+1; k++){
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numerator[k] = syntDenum[LPC_FILTERORDER-k];
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}
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/* decoding of the maximum value */
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maxVal = WebRtcIlbcfix_kFrgQuantMod[idxForMax];
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/* decoding of the sample values */
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tmp1 = sampleVal;
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tmp2 = &idxVec[len-1];
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if (idxForMax<37) {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 2097152 (= 0.5 << 22)
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maxVal is in Q8 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 2097152) >>
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22);
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tmp1++;
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tmp2--;
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}
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} else if (idxForMax<59) {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 262144 (= 0.5 << 19)
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maxVal is in Q5 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 262144) >>
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19);
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tmp1++;
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tmp2--;
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}
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} else {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 65536 (= 0.5 << 17)
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maxVal is in Q3 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 65536) >>
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17);
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tmp1++;
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tmp2--;
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}
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}
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/* Set the rest of the data to zero */
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WebRtcSpl_MemSetW16(&sampleVal[len], 0, len);
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/* circular convolution with all-pass filter */
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/* Set the state to zero */
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WebRtcSpl_MemSetW16(sampleValVec, 0, (LPC_FILTERORDER));
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/* Run MA filter + AR filter */
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WebRtcSpl_FilterMAFastQ12(
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sampleVal, sampleMa,
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numerator, LPC_FILTERORDER+1, (int16_t)(len + LPC_FILTERORDER));
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WebRtcSpl_MemSetW16(&sampleMa[len + LPC_FILTERORDER], 0, (len - LPC_FILTERORDER));
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WebRtcSpl_FilterARFastQ12(
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sampleMa, sampleAr,
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syntDenum, LPC_FILTERORDER+1, 2 * len);
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tmp1 = &sampleAr[len-1];
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tmp2 = &sampleAr[2*len-1];
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tmp3 = Out_fix;
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for(k=0;k<len;k++){
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(*tmp3) = (*tmp1) + (*tmp2);
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tmp1--;
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tmp2--;
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tmp3++;
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}
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}
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