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Don't try to shift more bits than the variable length

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Shifting by more than (or equal to) the variable length is
undefined in C.

This caused the quantized spectrum values to go out of range,
triggering asserts later.

Change-Id: If81b6c8caa7b9c75941ad9d280b686d2069c968c
This commit is contained in:
Martin Storsjo 2012-08-10 10:57:24 +03:00
parent d2854e2ac7
commit 6574569496
1 changed files with 8 additions and 2 deletions
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10
libAACenc/src/quantize.cpp
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@ -127,7 +127,10 @@ static void FDKaacEnc_quantizeLines(INT gain,
accu = fMultDiv2(FDKaacEnc_mTab_3_4[tabIndex],FDKaacEnc_quantTableE[totalShift&3]);
totalShift = (16-4)-(3*(totalShift>>2));
FDK_ASSERT(totalShift >=0); /* MAX_QUANT_VIOLATION */
accu>>=totalShift;
if (totalShift < 32)
accu>>=totalShift;
else
accu = 0;
quaSpectrum[line] = (SHORT)(-((LONG)(k + accu) >> (DFRACT_BITS-1-16)));
}
else if(accu > FL2FXCONST_DBL(0.0f))
@ -140,7 +143,10 @@ static void FDKaacEnc_quantizeLines(INT gain,
accu = fMultDiv2(FDKaacEnc_mTab_3_4[tabIndex],FDKaacEnc_quantTableE[totalShift&3]);
totalShift = (16-4)-(3*(totalShift>>2));
FDK_ASSERT(totalShift >=0); /* MAX_QUANT_VIOLATION */
accu>>=totalShift;
if (totalShift < 32)
accu>>=totalShift;
else
accu = 0;
quaSpectrum[line] = (SHORT)((LONG)(k + accu) >> (DFRACT_BITS-1-16));
}
else