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flacenc: ensure the order is within the min/max range in LPC order search 

This fixes use of uninitialized values when the FLAC encoder uses the
2-level, 4-level, and 8-level search methods. Fixes failure of the
fate-flac-24-comp-8 test when run using valgrind.
This commit is contained in:
Justin Ruggles 2012-11-07 14:48:28 -05:00
parent 3ba416408a
commit 3a2731cbd3
1 changed files with 5 additions and 3 deletions
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8
libavcodec/flacenc.c
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@ -799,14 +799,16 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
omethod == ORDER_METHOD_8LEVEL) {
int levels = 1 << omethod;
uint64_t bits[1 << ORDER_METHOD_8LEVEL];
int order;
int order = -1;
int opt_index = levels-1;
opt_order = max_order-1;
bits[opt_index] = UINT32_MAX;
for (i = levels-1; i >= 0; i--) {
int last_order = order;
order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
if (order < 0)
order = 0;
order = av_clip(order, min_order - 1, max_order - 1);
if (order == last_order)
continue;
s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order],
shift[order]);
bits[i] = find_subframe_rice_params(s, sub, order+1);