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authorAndreas Rheinhardt <andreas.rheinhardt@gmail.com>2020-11-05 02:29:26 +0100
committerAndreas Rheinhardt <andreas.rheinhardt@gmail.com>2020-12-08 17:51:46 +0100
commit76a4356a75fd1bb79101ac00bfb73303c369dfc8 (patch)
treeb83c821922626bb189e2ca8ea460d3ac02ef8dd2 /libavutil/time.c
parentb52e0d9504d1b45bc64489262facc8e48adb9bc2 (diff)
downloadffmpeg-76a4356a75fd1bb79101ac00bfb73303c369dfc8.tar.gz
avcodec/atrac9dec: Don't create VLCs that are never used
The ATRAC9 decoder creates VLCs with parameters contained in HuffmanCodebooks; some of these HuffmanCodebooks are empty and yet VLCs (that were completely unused*) were created from them. Said VLC contained a single table with 512 VLC_TYPE[2] entries, each of which indicated that this is an invalid code. This commit stops creating said VLCs. *: read_coeffs_coarse() uses the HuffmanCodebook at9_huffman_coeffs[cb][prec][cbi]. prec is c->precision_coarse[i] + 1 and every precision_coarse entry is in the 1..15 range after calc_precision(), so prec is >= 2 (all codebooks with prec < 2 are empty). The remaining empty codebooks are those with cb == 1 and cbi == 0, yet this is impossible, too: cb is given by c->codebookset[i] and this is always 0 if i < 8 (because those are never set to anything else in calc_codebook_idx()) and cbi is given by at9_q_unit_to_codebookidx[i] which is never zero if i >= 8. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavutil/time.c')
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