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avcodec/tscc2: Reduce the size of the tables used to initialize VLCs

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After permuting both the codes, lengths and symbols tables so that
the codes tables are ordered from left to right in the tree, the codes
tables can be easily computed from the lengths tables at runtime and
therefore omitted. This saves about 2KB from the binary.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-10-29 16:13:03 +01:00
parent f55da066ec
commit d2e55e3aa1
2 changed files with 397 additions and 830 deletions
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24
libavcodec/tscc2.c
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@ -62,24 +62,24 @@ static av_cold int init_vlcs(TSCC2Context *c)
{
int i, ret;
ret = ff_init_vlc_sparse(&c->dc_vlc, 9, DC_VLC_COUNT,
tscc2_dc_vlc_bits, 1, 1,
tscc2_dc_vlc_codes, 2, 2,
tscc2_dc_vlc_syms, 2, 2, INIT_VLC_LE);
ret = ff_init_vlc_from_lengths(&c->dc_vlc, 9, DC_VLC_COUNT,
tscc2_dc_vlc_lens, 1,
tscc2_dc_vlc_syms, 2, 2,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
for (i = 0; i < NUM_VLC_SETS; i++) {
ret = ff_init_vlc_sparse(c->nc_vlc + i, 9, 16,
tscc2_nc_vlc_bits[i], 1, 1,
tscc2_nc_vlc_codes[i], 2, 2,
tscc2_nc_vlc_syms, 1, 1, INIT_VLC_LE);
ret = ff_init_vlc_from_lengths(c->nc_vlc + i, 9, 16,
tscc2_nc_vlc_lens[i], 1,
tscc2_nc_vlc_syms[i], 1, 1,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
ret = ff_init_vlc_sparse(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
tscc2_ac_vlc_bits[i], 1, 1,
tscc2_ac_vlc_codes[i], 2, 2,
tscc2_ac_vlc_syms[i], 2, 2, INIT_VLC_LE);
ret = ff_init_vlc_from_lengths(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
tscc2_ac_vlc_bits[i], 1,
tscc2_ac_vlc_syms[i], 2, 2,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
}

1203
libavcodec/tscc2data.h
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