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Introduce scaling in FDKhybridSynthesisApply() to avoid potential signed integer overflow. 

Bug: 146937225
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: Ifa3d157a842828c2a66694d95dad5d4992ff6d87
This commit is contained in:
Fraunhofer IIS FDK 2019-11-13 16:05:17 +01:00 committed by Jean-Michel Trivi
parent 7019272646
commit 76c229c018
1 changed files with 18 additions and 16 deletions
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34
libFDK/src/FDK_hybrid.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
@ -142,11 +142,12 @@ amm-info@iis.fraunhofer.de
} /* How to arrange the packed values. */
struct FDK_HYBRID_SETUP {
UCHAR nrQmfBands; /*!< Number of QMF bands to be converted to hybrid. */
UCHAR nHybBands[3]; /*!< Number of Hybrid bands generated by nrQmfBands. */
SCHAR kHybrid[3]; /*!< Filter configuration of each QMF band. */
UCHAR protoLen; /*!< Prototype filter length. */
UCHAR filterDelay; /*!< Delay caused by hybrid filter. */
UCHAR nrQmfBands; /*!< Number of QMF bands to be converted to hybrid. */
UCHAR nHybBands[3]; /*!< Number of Hybrid bands generated by nrQmfBands. */
UCHAR synHybScale[3]; /*!< Headroom needed in hybrid synthesis filterbank. */
SCHAR kHybrid[3]; /*!< Filter configuration of each QMF band. */
UCHAR protoLen; /*!< Prototype filter length. */
UCHAR filterDelay; /*!< Delay caused by hybrid filter. */
const INT
*pReadIdxTable; /*!< Helper table to access input data ringbuffer. */
};
@ -156,12 +157,12 @@ static const INT ringbuffIdxTab[2 * 13] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 0, 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12};
static const FDK_HYBRID_SETUP setup_3_16 = {3, {8, 4, 4}, {8, 4, 4},
13, (13 - 1) / 2, ringbuffIdxTab};
static const FDK_HYBRID_SETUP setup_3_12 = {3, {8, 2, 2}, {8, 2, 2},
13, (13 - 1) / 2, ringbuffIdxTab};
static const FDK_HYBRID_SETUP setup_3_10 = {3, {6, 2, 2}, {-8, -2, 2},
13, (13 - 1) / 2, ringbuffIdxTab};
static const FDK_HYBRID_SETUP setup_3_16 = {
3, {8, 4, 4}, {4, 3, 3}, {8, 4, 4}, 13, (13 - 1) / 2, ringbuffIdxTab};
static const FDK_HYBRID_SETUP setup_3_12 = {
3, {8, 2, 2}, {4, 2, 2}, {8, 2, 2}, 13, (13 - 1) / 2, ringbuffIdxTab};
static const FDK_HYBRID_SETUP setup_3_10 = {
3, {6, 2, 2}, {3, 2, 2}, {-8, -2, 2}, 13, (13 - 1) / 2, ringbuffIdxTab};
static const FIXP_HTP HybFilterCoef8[] = {
HTCP(0x10000000, 0x00000000), HTCP(0x0df26407, 0xfa391882),
@ -477,17 +478,18 @@ void FDKhybridSynthesisApply(HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter,
*/
for (k = 0; k < nrQmfBandsLF; k++) {
const int nHybBands = hSynthesisHybFilter->pSetup->nHybBands[k];
const int scale = hSynthesisHybFilter->pSetup->synHybScale[k];
FIXP_DBL accu1 = FL2FXCONST_DBL(0.f);
FIXP_DBL accu2 = FL2FXCONST_DBL(0.f);
/* Perform hybrid filtering. */
for (n = 0; n < nHybBands; n++) {
accu1 += pHybridReal[hybOffset + n];
accu2 += pHybridImag[hybOffset + n];
accu1 += pHybridReal[hybOffset + n] >> scale;
accu2 += pHybridImag[hybOffset + n] >> scale;
}
pQmfReal[k] = accu1;
pQmfImag[k] = accu2;
pQmfReal[k] = SATURATE_LEFT_SHIFT(accu1, scale, DFRACT_BITS);
pQmfImag[k] = SATURATE_LEFT_SHIFT(accu2, scale, DFRACT_BITS);
hybOffset += nHybBands;
}