nlsf can be negative, but a negative index for silk_cosine doesn't work.
---
libavcodec/opus_silk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/opus_silk.c b/libavcodec/opus_silk.c
index 841d1ed..3ac83b8 100644
--- a/libavcodec/opus_silk.c
+++ b/libavcodec/opus_silk.c
@@ -941,7 +941,7 @@ static void silk_lsf2lpc(const int16_t nlsf[16], float
lpcf[16], int order)
/* convert the LSFs to LSPs, i.e. 2*cos(LSF) */
for (k = 0; k < order; k++) {
- int index = nlsf[k] >> 8;
+ int index = FFABS(nlsf[k]) >> 8;
int offset = nlsf[k] & 255;
int k2 = (order == 10) ? silk_lsf_ordering_nbmb[k] :
silk_lsf_ordering_wb[k];
--
2.6.2
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