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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>
This commit is contained in:
Michael Niedermayer 2019-09-20 20:16:54 +02:00
parent 74bbf9bc82
commit c7c0229beb
1 changed files with 3 additions and 4 deletions
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7
libavcodec/truespeech.c
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@ -132,8 +132,7 @@ static void truespeech_correlate_filter(TSContext *dec)
if(i > 0){
memcpy(tmp, dec->cvector, i * sizeof(*tmp));
for(j = 0; j < i; j++)
dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
(dec->cvector[j] << 15) + 0x4000) >> 15;
dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
}
dec->cvector[i] = (8 - dec->vector[i]) >> 3;
}
@ -256,7 +255,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
int sum = 0;
for(k = 0; k < 8; k++)
sum += ptr0[k] * ptr1[k];
sum = (sum + (out[i] << 12) + 0x800) >> 12;
sum = out[i] + ((sum + 0x800) >> 12);
out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];
@ -274,7 +273,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];
ptr0[0] = out[i];
out[i] = ((out[i] << 12) - sum) >> 12;
out[i] += (- sum) >> 12;
}
for(i = 0; i < 8; i++)