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Merge "Limit smoothedNoise values to avoid integer overflows in adjustTimeSlotHQ() and adjustTimeSlotHQ_GainAndNoise()."

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Jean-Michel Trivi
2020-12-28 16:29:55 +00:00
committed by Android (Google) Code Review
parent 1e2fb8395c 4305167ceb
commit f67a5bb99c
1 changed files with 18 additions and 1 deletions
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19
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 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
© Copyright 1995 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@@ -1398,6 +1398,17 @@ void calculateSbrEnvelope(
*/
noise_e = (start_pos < no_cols) ? adj_e : final_e;
if (start_pos >= no_cols) {
int diff = h_sbr_cal_env->filtBufferNoise_e - noise_e;
if (diff > 0) {
int s = getScalefactor(h_sbr_cal_env->filtBufferNoise, noSubbands);
if (diff > s) {
final_e += diff - s;
noise_e = final_e;
}
}
}
/*
Convert energies to amplitude levels
*/
@@ -2741,6 +2752,9 @@ static void adjustTimeSlotHQ_GainAndNoise(
fMult(direct_ratio, noiseLevel[k]);
}
smoothedNoise = fMax(fMin(smoothedNoise, (FIXP_DBL)(MAXVAL_DBL / 2)),
(FIXP_DBL)(MINVAL_DBL / 2));
/*
The next 2 multiplications constitute the actual envelope adjustment
of the signal and should be carried out with full accuracy
@@ -2930,6 +2944,9 @@ static void adjustTimeSlotHQ(
fMult(direct_ratio, noiseLevel[k]);
}
smoothedNoise = fMax(fMin(smoothedNoise, (FIXP_DBL)(MAXVAL_DBL / 2)),
(FIXP_DBL)(MINVAL_DBL / 2));
/*
The next 2 multiplications constitute the actual envelope adjustment
of the signal and should be carried out with full accuracy