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avcodec/truespeech: fix left shift of negative value
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@ -281,7 +281,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
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ptr0 = dec->tmp3;
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for(i = 0; i < 60; i++){
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int sum = out[i] << 12;
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int sum = out[i] * (1 << 12);
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for(k = 0; k < 8; k++)
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sum += ptr0[k] * t[k];
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for(k = 7; k > 0; k--)
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