From e51063ca54212efa9a2074ec02626999ced2fb74 Mon Sep 17 00:00:00 2001 From: Fraunhofer IIS FDK Date: Fri, 8 Mar 2019 16:09:25 +0100 Subject: Avoid -1.0 autocorrelation input data. Bug: 132641988 Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc Change-Id: I2d4ccf9ee666a5533417ea98302de4a01b74c5ce --- libSBRdec/src/lpp_tran.cpp | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) (limited to 'libSBRdec/src/lpp_tran.cpp') diff --git a/libSBRdec/src/lpp_tran.cpp b/libSBRdec/src/lpp_tran.cpp index 2ef07eb..6acb626 100644 --- a/libSBRdec/src/lpp_tran.cpp +++ b/libSBRdec/src/lpp_tran.cpp @@ -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. -- cgit v1.2.3