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aacsbr: break infinite loop in sbr_hf_calc_npatches

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Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 584cc1ade1)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andreas Cadhalpun 2015-04-22 15:23:24 +02:00 committed by Michael Niedermayer
parent f61ebd555d
commit 17fd68e9d7
1 changed files with 7 additions and 1 deletions
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8
libavcodec/aacsbr.c
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@ -514,7 +514,7 @@ static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
{
int i, k, sb = 0;
int i, k, last_k = -1, last_msb = -1, sb = 0;
int msb = sbr->k[0];
int usb = sbr->kx[1];
int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
@ -528,6 +528,12 @@ static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
do {
int odd = 0;
if (k == last_k && msb == last_msb) {
av_log(ac->avctx, AV_LOG_ERROR, "patch construction failed\n");
return AVERROR_INVALIDDATA;
}
last_k = k;
last_msb = msb;
for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
sb = sbr->f_master[i];
odd = (sb + sbr->k[0]) & 1;