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Prevent too large shift exponent in apply_inter_tes() and merge two loops. am: 2a40fde39d am: 92dab635f7 

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/aac/+/14471061

Change-Id: I875ddf34a24a92655f0cfdefab55f0bcb355fdcb
This commit is contained in:
Fraunhofer IIS FDK 2021-05-07 22:12:01 +00:00 committed by Automerger Merge Worker
parent 148544e625 92dab635f7
commit 3db8ac7a00
1 changed files with 9 additions and 22 deletions
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31
libSBRdec/src/env_calc.cpp
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@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten
© Copyright 1995 - 2021 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@ -664,7 +664,7 @@ static void apply_inter_tes(FIXP_DBL **qmfReal, FIXP_DBL **qmfImag,
gain_sf[i] = mult_sf - total_power_low_sf + sf2;
gain[i] = sqrtFixp_lookup(gain[i], &gain_sf[i]);
if (gain_sf[i] < 0) {
gain[i] >>= -gain_sf[i];
gain[i] >>= fMin(DFRACT_BITS - 1, -gain_sf[i]);
gain_sf[i] = 0;
}
} else {
@ -683,11 +683,6 @@ static void apply_inter_tes(FIXP_DBL **qmfReal, FIXP_DBL **qmfImag,
/* gain[i] = g_inter[i] */
for (i = 0; i < nbSubsample; ++i) {
if (gain_sf[i] < 0) {
gain[i] >>= -gain_sf[i];
gain_sf[i] = 0;
}
/* calculate: gain[i] = 1.0f + gamma * (gain[i] - 1.0f); */
FIXP_DBL one = (FIXP_DBL)MAXVAL_DBL >>
gain_sf[i]; /* to substract this from gain[i] */
@ -755,23 +750,15 @@ static void apply_inter_tes(FIXP_DBL **qmfReal, FIXP_DBL **qmfImag,
int gain_adj_sf = gain_adj_2_sf;
for (i = 0; i < nbSubsample; ++i) {
gain[i] = fMult(gain[i], gain_adj);
gain_sf[i] += gain_adj_sf;
/* limit gain */
if (gain_sf[i] > INTER_TES_SF_CHANGE) {
gain[i] = (FIXP_DBL)MAXVAL_DBL;
gain_sf[i] = INTER_TES_SF_CHANGE;
}
}
for (i = 0; i < nbSubsample; ++i) {
/* equalize gain[]'s scale factors */
gain[i] >>= INTER_TES_SF_CHANGE - gain_sf[i];
int gain_e = fMax(
fMin(gain_sf[i] + gain_adj_sf - INTER_TES_SF_CHANGE, DFRACT_BITS - 1),
-(DFRACT_BITS - 1));
FIXP_DBL gain_final = fMult(gain[i], gain_adj);
gain_final = scaleValueSaturate(gain_final, gain_e);
for (j = lowSubband; j < highSubband; j++) {
qmfReal[startPos + i][j] = fMult(qmfReal[startPos + i][j], gain[i]);
qmfImag[startPos + i][j] = fMult(qmfImag[startPos + i][j], gain[i]);
qmfReal[startPos + i][j] = fMult(qmfReal[startPos + i][j], gain_final);
qmfImag[startPos + i][j] = fMult(qmfImag[startPos + i][j], gain_final);
}
}
} else { /* gamma_idx == 0 */