mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/smacker: Remove redundant check when decoding header trees
When length is zero for a leaf node (which happens iff the Huffman tree consists of one leaf node only), prefix is also automatically zero. Performance impact is negligible: For GCC 9 and the sample from #2425, the time for one call to smka_decode_frame() decreased from 2053758 to 2053671 decicycles; for Clang 9 it went from 1523153 to 1521288. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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@ -105,13 +105,8 @@ static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t pref
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av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
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return AVERROR_INVALIDDATA;
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}
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if(length){
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hc->bits[hc->current] = prefix;
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hc->lengths[hc->current] = length;
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} else {
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hc->bits[hc->current] = 0;
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hc->lengths[hc->current] = 0;
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}
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hc->bits[hc->current] = prefix;
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hc->lengths[hc->current] = length;
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hc->values[hc->current] = get_bits(gb, 8);
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hc->current++;
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return 0;
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