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| author | Luca Barbato <lu_zero@gentoo.org> | 2013-07-12 23:02:25 +0200 |
|---|---|---|
| committer | Luca Barbato <lu_zero@gentoo.org> | 2013-07-23 23:03:37 +0200 |
| commit | 70ecc175c7b513a153ac87d1c5d219556ca55070 (patch) | |
| tree | 61d47d78ff5787f03a0d15e4895cc8d535bf8146 /libavcodec/alsdec.c | |
| parent | 69e6702c013283d0e043e19e079c8eecb08bfd39 (diff) | |
| download | ffmpeg-70ecc175c7b513a153ac87d1c5d219556ca55070.tar.gz | |
alsdec: Fix the clipping range
mcc_weightings is only 32 elements.
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Diffstat (limited to 'libavcodec/alsdec.c')
| -rw-r--r-- | libavcodec/alsdec.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index 8451edb081..608c50a0e3 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -1152,6 +1152,12 @@ static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, return 0; } +static inline int als_weighting(GetBitContext *gb, int k, int off) +{ + int idx = av_clip(decode_rice(gb, k) + off, + 0, FF_ARRAY_ELEMS(mcc_weightings) - 1); + return mcc_weightings[idx]; +} /** Read the channel data. */ @@ -1172,14 +1178,14 @@ static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c) if (current->master_channel != c) { current->time_diff_flag = get_bits1(gb); - current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)]; - current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)]; - current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)]; + current->weighting[0] = als_weighting(gb, 1, 16); + current->weighting[1] = als_weighting(gb, 2, 14); + current->weighting[2] = als_weighting(gb, 1, 16); if (current->time_diff_flag) { - current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)]; - current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)]; - current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)]; + current->weighting[3] = als_weighting(gb, 1, 16); + current->weighting[4] = als_weighting(gb, 1, 16); + current->weighting[5] = als_weighting(gb, 1, 16); current->time_diff_sign = get_bits1(gb); current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3; |