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avcodec/atrac3plus: Simplify creating VLCs

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Use ff_init_vlc_from_lengths() to offload the computation of the codes.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-01 16:21:32 +01:00
parent 7a7295a8ce
commit cfc473ef10
1 changed files with 2 additions and 6 deletions
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8
libavcodec/atrac3plus.c
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@ -51,9 +51,7 @@ static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat,
int *tab_offset, VLC *out_vlc)
{
int i, b;
uint16_t codes[256];
uint8_t bits[256];
unsigned code = 0;
int index = 0;
int min_len = *cb++; // get shortest codeword length
int max_len = *cb++; // get longest codeword length
@ -62,17 +60,15 @@ static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat,
for (i = *cb++; i > 0; i--) {
av_assert0(index < 256);
bits[index] = b;
codes[index] = code++;
index++;
}
code <<= 1;
}
out_vlc->table = &tables_data[*tab_offset];
out_vlc->table_allocated = 1 << max_len;
ff_init_vlc_sparse(out_vlc, max_len, index, bits, 1, 1, codes, 2, 2,
xlat, 1, 1, INIT_VLC_USE_NEW_STATIC);
ff_init_vlc_from_lengths(out_vlc, max_len, index, bits, 1,
xlat, 1, 1, 0, INIT_VLC_USE_NEW_STATIC, NULL);
*tab_offset += 1 << max_len;
}