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avfilter/avf_showfreqs: assert that variables are initialized by switch()

Silences: CID1351396

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Michael Niedermayer authored on 2016/02/12 08:37:11
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@@ -310,6 +310,8 @@ static inline void plot_freq(ShowFreqsContext *s, int ch,
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         end = (outlink->h / s->nb_channels) * (ch + 1);
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         y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1;
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         break;
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+    default:
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+        av_assert0(0);
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     }
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     if (y < 0)
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         return;