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avcodec/jpeg2000dwt: Check ndeclevels before calling dwt_encode*()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -580,6 +580,9 @@ int ff_jpeg2000_dwt_init(DWTContext *s, int border[2][2],
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int ff_dwt_encode(DWTContext *s, void *t)
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{
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if (s->ndeclevels == 0)
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return 0;
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switch(s->type){
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case FF_DWT97:
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dwt_encode97_float(s, t); break;
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