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Use scaleValuesSaturate() to avoid integer overflows in QmfTransposerApply(). am: e5a14d0a33 am: 4390bad523 

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/aac/+/14471060

Change-Id: I00693eca7c3fac09f358d86e7a5a3d98c7ed029d
This commit is contained in:
Fraunhofer IIS FDK 2021-05-07 22:11:57 +00:00 committed by Automerger Merge Worker
parent ef265e496f 4390bad523
commit 148544e625
1 changed files with 20 additions and 35 deletions
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45
libSBRdec/src/hbe.cpp
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@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
© Copyright 1995 - 2021 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@ -1400,42 +1400,27 @@ void QmfTransposerApply(HANDLE_HBE_TRANSPOSER hQmfTransposer,
if (shift_ov != 0) {
for (i = 0; i < HBE_MAX_OUT_SLOTS; i++) {
for (band = 0; band < QMF_SYNTH_CHANNELS; band++) {
if (shift_ov >= 0) {
hQmfTransposer->qmfHBEBufReal_F[i][band] <<= shift_ov;
hQmfTransposer->qmfHBEBufImag_F[i][band] <<= shift_ov;
} else {
hQmfTransposer->qmfHBEBufReal_F[i][band] >>= (-shift_ov);
hQmfTransposer->qmfHBEBufImag_F[i][band] >>= (-shift_ov);
}
}
}
scaleValuesSaturate(&hQmfTransposer->qmfHBEBufReal_F[i][0],
QMF_SYNTH_CHANNELS, shift_ov);
scaleValuesSaturate(&hQmfTransposer->qmfHBEBufImag_F[i][0],
QMF_SYNTH_CHANNELS, shift_ov);
}
if ((keepStatesSyncedMode == KEEP_STATES_SYNCED_OFF) && shift_ov != 0) {
if (keepStatesSyncedMode == KEEP_STATES_SYNCED_OFF) {
int nBands =
fMax(0, hQmfTransposer->stopBand - hQmfTransposer->startBand);
for (i = timeStep * firstSlotOffsset; i < ov_len; i++) {
for (band = hQmfTransposer->startBand; band < hQmfTransposer->stopBand;
band++) {
if (shift_ov >= 0) {
ppQmfBufferOutReal_F[i][band] <<= shift_ov;
ppQmfBufferOutImag_F[i][band] <<= shift_ov;
} else {
ppQmfBufferOutReal_F[i][band] >>= (-shift_ov);
ppQmfBufferOutImag_F[i][band] >>= (-shift_ov);
}
}
scaleValuesSaturate(&ppQmfBufferOutReal_F[i][hQmfTransposer->startBand],
nBands, shift_ov);
scaleValuesSaturate(&ppQmfBufferOutImag_F[i][hQmfTransposer->startBand],
nBands, shift_ov);
}
/* shift lpc filterstates */
for (i = 0; i < timeStep * firstSlotOffsset + LPC_ORDER; i++) {
for (band = 0; band < (64); band++) {
if (shift_ov >= 0) {
lpcFilterStatesReal[i][band] <<= shift_ov;
lpcFilterStatesImag[i][band] <<= shift_ov;
} else {
lpcFilterStatesReal[i][band] >>= (-shift_ov);
lpcFilterStatesImag[i][band] >>= (-shift_ov);
}
scaleValuesSaturate(&lpcFilterStatesReal[i][0], (64), shift_ov);
scaleValuesSaturate(&lpcFilterStatesImag[i][0], (64), shift_ov);
}
}
}