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avcodec/evc_parse: remove pow() and log2() 

The use of float based functions is both unneeded and wrong due to unpredictable rounding

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-10-05 00:10:18 +02:00
parent f2687a3b69
commit d35eecd24f
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GPG Key ID: B18E8928B3948D64
1 changed files with 6 additions and 4 deletions
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10
libavcodec/evc_parse.c
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@ -172,7 +172,8 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
poc->PicOrderCntVal = 0;
poc->DocOffset = -1;
} else {
int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
int SubGopLength = 1 << sps->log2_sub_gop_length;
if (tid == 0) {
poc->PicOrderCntVal = poc->prevPicOrderCntVal + SubGopLength;
poc->DocOffset = 0;
@ -187,15 +188,16 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
poc->prevPicOrderCntVal += SubGopLength;
ExpectedTemporalId = 0;
} else
ExpectedTemporalId = 1 + (int)log2(poc->DocOffset);
ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
while (tid != ExpectedTemporalId) {
poc->DocOffset = (poc->DocOffset + 1) % SubGopLength;
if (poc->DocOffset == 0)
ExpectedTemporalId = 0;
else
ExpectedTemporalId = 1 + (int)log2(poc->DocOffset);
ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
}
PocOffset = (int)(SubGopLength * ((2.0 * poc->DocOffset + 1) / (int)pow(2.0, tid) - 2));
PocOffset = (int)(SubGopLength * ((2.0 * poc->DocOffset + 1) / (1 << tid) - 2));
poc->PicOrderCntVal = poc->prevPicOrderCntVal + PocOffset;
}
}