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qdm2: check and reset dithering index per channel

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Checking per subband would have the index exceed the
dithering noise table size.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 744a11c996)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato
2013-06-27 02:50:52 +02:00
parent 998a0389d3
commit 64bcb5d350
1 changed files with 1 additions and 2 deletions
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3
libavcodec/qdm2.c
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@@ -825,8 +825,6 @@ static void synthfilt_build_sb_samples(QDM2Context *q, GetBitContext *gb,
} }
for (sb = sb_min; sb < sb_max; sb++) { for (sb = sb_min; sb < sb_max; sb++) {
FIX_NOISE_IDX(q->noise_idx);
channels = q->nb_channels; channels = q->nb_channels;
if (q->nb_channels <= 1 || sb < 12) if (q->nb_channels <= 1 || sb < 12)
@@ -850,6 +848,7 @@ static void synthfilt_build_sb_samples(QDM2Context *q, GetBitContext *gb,
} }
for (ch = 0; ch < channels; ch++) { for (ch = 0; ch < channels; ch++) {
FIX_NOISE_IDX(q->noise_idx);
zero_encoding = (get_bits_left(gb) >= 1) ? get_bits1(gb) : 0; zero_encoding = (get_bits_left(gb) >= 1) ? get_bits1(gb) : 0;
type34_predictor = 0.0; type34_predictor = 0.0;
type34_first = 1; type34_first = 1;