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Avoid integer overflow in dct_II().

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Bug: 176246647
Test: atest DecoderTestXheAac DecoderTestAacDrc
Change-Id: I6c30c4dec3f85410c2748eb42d38f5eb72521ec5
This commit is contained in:
Fraunhofer IIS FDK
2020-04-09 17:52:56 +02:00
committed by Jean-Michel Trivi
parent 9f9bffb763
commit 2b281bb5a3
1 changed files with 13 additions and 15 deletions
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28
libFDK/src/dct.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 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@@ -305,9 +305,8 @@ void dct_II(
{
for (i = 0; i < M; i++) {
tmp[i] = pDat[2 * i] >> 1; /* dit_fft expects 1 bit scaled input values */
tmp[L - 1 - i] =
pDat[2 * i + 1] >> 1; /* dit_fft expects 1 bit scaled input values */
tmp[i] = pDat[2 * i] >> 2;
tmp[L - 1 - i] = pDat[2 * i + 1] >> 2;
}
}
@@ -337,15 +336,14 @@ void dct_II(
a1 = ((pTmp_0[0] >> 1) + (pTmp_1[0] >> 1));
a2 = ((pTmp_0[1] >> 1) - (pTmp_1[1] >> 1));
cplxMultDiv2(&accu3, &accu4, (a1 + accu2), -(accu1 + a2),
sin_twiddle[i * inc]);
pDat[L - i] = accu4;
pDat[i] = accu3;
cplxMult(&accu3, &accu4, (accu1 + a2), (a1 + accu2), sin_twiddle[i * inc]);
pDat[L - i] = -accu3;
pDat[i] = accu4;
cplxMultDiv2(&accu3, &accu4, (a1 - accu2), -(accu1 - a2),
sin_twiddle[(M - i) * inc]);
pDat[M + i] = accu4;
pDat[M - i] = accu3;
cplxMult(&accu3, &accu4, (accu1 - a2), (a1 - accu2),
sin_twiddle[(M - i) * inc]);
pDat[M + i] = -accu3;
pDat[M - i] = accu4;
/* Create index helper variables for (4*i)*inc indexed equivalent values of
* short tables. */
@@ -356,12 +354,12 @@ void dct_II(
}
}
cplxMultDiv2(&accu1, &accu2, tmp[M], tmp[M + 1], sin_twiddle[(M / 2) * inc]);
cplxMult(&accu1, &accu2, tmp[M], tmp[M + 1], sin_twiddle[(M / 2) * inc]);
pDat[L - (M / 2)] = accu2;
pDat[M / 2] = accu1;
pDat[0] = (tmp[0] >> 1) + (tmp[1] >> 1);
pDat[M] = fMult(((tmp[0] >> 1) - (tmp[1] >> 1)),
pDat[0] = tmp[0] + tmp[1];
pDat[M] = fMult(tmp[0] - tmp[1],
sin_twiddle[M * inc].v.re); /* cos((PI/(2*L))*M); */
*pDat_e += 2;