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avcodec/truespeech: Eliminate some left shifts
This avoids some invalid shifts Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -132,8 +132,7 @@ static void truespeech_correlate_filter(TSContext *dec)
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if(i > 0){
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memcpy(tmp, dec->cvector, i * sizeof(*tmp));
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for(j = 0; j < i; j++)
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dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
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(dec->cvector[j] << 15) + 0x4000) >> 15;
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dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
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}
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dec->cvector[i] = (8 - dec->vector[i]) >> 3;
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}
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@ -256,7 +255,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
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int sum = 0;
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for(k = 0; k < 8; k++)
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sum += ptr0[k] * ptr1[k];
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sum = (sum + (out[i] << 12) + 0x800) >> 12;
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sum = out[i] + ((sum + 0x800) >> 12);
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out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
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for(k = 7; k > 0; k--)
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ptr0[k] = ptr0[k - 1];
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@ -274,7 +273,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
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for(k = 7; k > 0; k--)
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ptr0[k] = ptr0[k - 1];
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ptr0[0] = out[i];
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out[i] = ((out[i] << 12) - sum) >> 12;
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out[i] += (- sum) >> 12;
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}
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for(i = 0; i < 8; i++)
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