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Adapt scaling in combineSignalCplxScale*() to prevent signed integer overflows. am: 773ff1d3e8 

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/aac/+/14470257

Change-Id: Iac3f458c5f7381667bb72edb0246a38e8954ab13
This commit is contained in:
Fraunhofer IIS FDK 2021-05-07 20:41:44 +00:00 committed by Automerger Merge Worker
parent 675de1faf2 773ff1d3e8
commit 6bfd703af9
1 changed files with 10 additions and 15 deletions
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25
libSACdec/src/sac_stp.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
@ -229,15 +229,13 @@ inline void combineSignalCplxScale1(FIXP_DBL *hybOutputRealDry,
int n;
FIXP_DBL scaleY;
for (n = bands - 1; n >= 0; n--) {
scaleY = fMultDiv2(scaleX, *pBP);
scaleY = fMult(scaleX, *pBP);
*hybOutputRealDry = SATURATE_LEFT_SHIFT(
(*hybOutputRealDry >> 1) +
(fMultDiv2(*hybOutputRealWet, scaleY) << (SF_SCALE + 1)),
1, DFRACT_BITS);
(*hybOutputRealDry >> SF_SCALE) + fMult(*hybOutputRealWet, scaleY),
SF_SCALE, DFRACT_BITS);
*hybOutputImagDry = SATURATE_LEFT_SHIFT(
(*hybOutputImagDry >> 1) +
(fMultDiv2(*hybOutputImagWet, scaleY) << (SF_SCALE + 1)),
1, DFRACT_BITS);
(*hybOutputImagDry >> SF_SCALE) + fMult(*hybOutputImagWet, scaleY),
SF_SCALE, DFRACT_BITS);
hybOutputRealDry++, hybOutputRealWet++;
hybOutputImagDry++, hybOutputImagWet++;
pBP++;
@ -253,14 +251,11 @@ inline void combineSignalCplxScale2(FIXP_DBL *hybOutputRealDry,
for (n = bands - 1; n >= 0; n--) {
*hybOutputRealDry = SATURATE_LEFT_SHIFT(
(*hybOutputRealDry >> 1) +
(fMultDiv2(*hybOutputRealWet, scaleX) << SF_SCALE),
1, DFRACT_BITS);
(*hybOutputRealDry >> SF_SCALE) + fMult(*hybOutputRealWet, scaleX),
SF_SCALE, DFRACT_BITS);
*hybOutputImagDry = SATURATE_LEFT_SHIFT(
(*hybOutputImagDry >> 1) +
(fMultDiv2(*hybOutputImagWet, scaleX) << SF_SCALE),
1, DFRACT_BITS);
;
(*hybOutputImagDry >> SF_SCALE) + fMult(*hybOutputImagWet, scaleX),
SF_SCALE, DFRACT_BITS);
hybOutputRealDry++, hybOutputRealWet++;
hybOutputImagDry++, hybOutputImagWet++;
}