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avcodec/vp3: Remove code duplication when initializing Theora VLCs

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theora_init_huffman_tables() does essentially the same as
ff_init_vlcs_from_lengths().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-06 11:03:34 +01:00
parent 802fc678b2
commit 420476ec78
1 changed files with 6 additions and 15 deletions
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21
libavcodec/vp3.c
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@ -2319,20 +2319,6 @@ static av_cold int init_frames(Vp3DecodeContext *s)
return 0;
}
static av_cold int theora_init_huffman_tables(VLC *vlc, const HuffTable *huff)
{
uint32_t code = 0, codes[32];
for (unsigned i = 0; i < huff->nb_entries; i++) {
codes[i] = code >> (31 - huff->entries[i].len);
code += 0x80000000U >> huff->entries[i].len;
}
return ff_init_vlc_sparse(vlc, 11, huff->nb_entries,
&huff->entries[0].len, sizeof(huff->entries[0]), 1,
codes, 4, 4,
&huff->entries[0].sym, sizeof(huff->entries[0]), 1, 0);
}
static av_cold int vp3_decode_init(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
@ -2460,7 +2446,12 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
}
} else {
for (i = 0; i < FF_ARRAY_ELEMS(s->coeff_vlc); i++) {
ret = theora_init_huffman_tables(&s->coeff_vlc[i], &s->huffman_table[i]);
const HuffTable *tab = &s->huffman_table[i];
ret = ff_init_vlc_from_lengths(&s->coeff_vlc[i], 11, tab->nb_entries,
&tab->entries[0].len, sizeof(*tab->entries),
&tab->entries[0].sym, sizeof(*tab->entries), 1,
0, 0, avctx);
if (ret < 0)
return ret;
}