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Avoid -1.0 autocorrelation input data. 

Bug: 132641988
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc

Change-Id: I2d4ccf9ee666a5533417ea98302de4a01b74c5ce
This commit is contained in:
Fraunhofer IIS FDK 2019-03-08 16:09:25 +01:00 committed by Jean-Michel Trivi
parent ce00007148
commit e51063ca54
1 changed files with 21 additions and 3 deletions
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24
libSBRdec/src/lpp_tran.cpp
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@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@ -446,8 +446,26 @@ void lppTransposer(
pSettings->nCols) +
lowBandShift);
}
dynamicScale = fixMax(
0, dynamicScale - 1); /* one additional bit headroom to prevent -1.0 */
if (dynamicScale == 0) {
/* In this special case the available headroom bits as well as
ovLowBandShift and lowBandShift are zero. The spectrum is limited to
prevent -1.0, so negative values for dynamicScale can be avoided. */
for (i = 0; i < (LPC_ORDER + pSettings->overlap + pSettings->nCols);
i++) {
lowBandReal[i] = fixMax(lowBandReal[i], (FIXP_DBL)0x80000001);
}
if (!useLP) {
for (i = 0; i < (LPC_ORDER + pSettings->overlap + pSettings->nCols);
i++) {
lowBandImag[i] = fixMax(lowBandImag[i], (FIXP_DBL)0x80000001);
}
}
} else {
dynamicScale =
fixMax(0, dynamicScale -
1); /* one additional bit headroom to prevent -1.0 */
}
/*
Scale temporal QMF buffer.