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Improve error robustness in arithmetic decoder 

Bug: 112663564
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: I3025adbf308bf510dc5bdc1d70c58979fb182187
This commit is contained in:
Fraunhofer IIS FDK 2018-06-29 16:33:55 +02:00 committed by Jean-Michel Trivi
parent f59fd73d44
commit 48a4bca8b3
1 changed files with 11 additions and 3 deletions
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14
libArithCoding/src/ac_arith_coder.cpp
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@ -609,13 +609,16 @@ static inline ULONG get_pk_v2(ULONG s) {
return (j & 0x3F);
}
static void decode2(HANDLE_FDK_BITSTREAM bbuf, UCHAR *RESTRICT c_prev,
FIXP_DBL *RESTRICT pSpectralCoefficient, INT n, INT nt) {
static ARITH_CODING_ERROR decode2(HANDLE_FDK_BITSTREAM bbuf,
UCHAR *RESTRICT c_prev,
FIXP_DBL *RESTRICT pSpectralCoefficient,
INT n, INT nt) {
Tastat as;
int i, l, r;
INT lev, esc_nb, pki;
USHORT state_inc;
UINT s;
ARITH_CODING_ERROR ErrorStatus = ARITH_CODER_OK;
int c_3 = 0; /* context of current frame 3 time steps ago */
int c_2 = 0; /* context of current frame 2 time steps ago */
@ -655,6 +658,8 @@ static void decode2(HANDLE_FDK_BITSTREAM bbuf, UCHAR *RESTRICT c_prev,
lev++;
if (lev > 23) return ARITH_CODER_ERROR;
if (esc_nb < 7) {
esc_nb++;
}
@ -721,6 +726,8 @@ static void decode2(HANDLE_FDK_BITSTREAM bbuf, UCHAR *RESTRICT c_prev,
}
FDKmemset(&c_prev[i], 1, sizeof(c_prev[0]) * (nt - i));
return ErrorStatus;
}
CArcoData *CArco_Create(void) { return GetArcoData(); }
@ -763,7 +770,8 @@ ARITH_CODING_ERROR CArco_DecodeArithData(CArcoData *pArcoData,
pArcoData->m_numberLinesPrev = lg_max;
if (lg > 0) {
decode2(hBs, pArcoData->c_prev + 2, mdctSpectrum, lg >> 1, lg_max >> 1);
ErrorStatus =
decode2(hBs, pArcoData->c_prev + 2, mdctSpectrum, lg >> 1, lg_max >> 1);
} else {
FDKmemset(&pArcoData->c_prev[2], 1,
sizeof(pArcoData->c_prev[2]) * (lg_max >> 1));