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Code Issues Releases Activity

avcodec/4xm: Avoid unnecessary VLC structures

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Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-09-24 17:23:47 +02:00
parent e5dcde620d
commit 25b9ff2780
1 changed files with 7 additions and 9 deletions
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16
libavcodec/4xm.c
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@ -125,7 +125,7 @@ static const uint8_t dequant_table[64] = {
20, 35, 34, 32, 31, 22, 15, 8,
};
static VLC block_type_vlc[2][4];
static VLCElem block_type_vlc[2][4][32];
typedef struct CFrameBuffer {
@ -250,17 +250,15 @@ static void idct(int16_t block[64])
static av_cold void init_vlcs(void)
{
static VLCElem table[2][4][32];
int i, j;
for (i = 0; i < 2; i++) {
for (j = 0; j < 4; j++) {
block_type_vlc[i][j].table = table[i][j];
block_type_vlc[i][j].table_allocated = 32;
vlc_init(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7,
&block_type_tab[i][j][0][1], 2, 1,
&block_type_tab[i][j][0][0], 2, 1,
VLC_INIT_USE_STATIC);
ff_vlc_init_table_sparse(block_type_vlc[i][j], FF_ARRAY_ELEMS(block_type_vlc[i][j]),
BLOCK_TYPE_VLC_BITS, 7,
&block_type_tab[i][j][0][1], 2, 1,
&block_type_tab[i][j][0][0], 2, 1,
NULL, 0, 0, 0);
}
}
}
@ -357,7 +355,7 @@ static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src,
if (get_bits_left(&f->gb) < 1)
return AVERROR_INVALIDDATA;
h = 1 << log2h;
code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index].table,
code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index],
BLOCK_TYPE_VLC_BITS, 1);
av_assert0(code >= 0 && code <= 6);