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Avoid undefined shift exponent in f2Pow().

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Bug: 146938418
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: Id28608e049244968158900848c23bf7a8298083d
This commit is contained in:
Fraunhofer IIS FDK 2019-11-13 16:09:45 +01:00 committed by Jean-Michel Trivi
parent cee316ab3e
commit e323bf6cab
2 changed files with 8 additions and 2 deletions
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2
libFDK/include/fixpoint_math.h
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@ -775,7 +775,7 @@ FIXP_DBL fPow(FIXP_DBL base_m, INT base_e, FIXP_DBL exp_m, INT exp_e,
/** /**
* \brief return (base_m * 2^base_e) ^ N * \brief return (base_m * 2^base_e) ^ N
* \param base_m mantissa of the base * \param base_m mantissa of the base. Must not be negative.
* \param base_e exponent of the base * \param base_e exponent of the base
* \param N power to be calculated of the base * \param N power to be calculated of the base
* \param result_e pointer to a INT where the exponent of the result will be * \param result_e pointer to a INT where the exponent of the result will be

8
libFDK/src/fixpoint_math.cpp
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@ -1,7 +1,7 @@
/* ----------------------------------------------------------------------------- /* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten © Copyright 1995 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved. Forschung e.V. All rights reserved.
1. INTRODUCTION 1. INTRODUCTION
@ -650,6 +650,12 @@ FIXP_DBL fPow(FIXP_DBL base_m, INT base_e, FIXP_DBL exp_m, INT exp_e,
INT ans_lg2_e, baselg2_e; INT ans_lg2_e, baselg2_e;
FIXP_DBL base_lg2, ans_lg2, result; FIXP_DBL base_lg2, ans_lg2, result;
if (base_m <= (FIXP_DBL)0) {
result = (FIXP_DBL)0;
*result_e = 0;
return result;
}
/* Calc log2 of base */ /* Calc log2 of base */
base_lg2 = fLog2(base_m, base_e, &baselg2_e); base_lg2 = fLog2(base_m, base_e, &baselg2_e);