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Code Issues Releases Activity

avcodec/intrax8: Avoid superfluous VLC structures

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Of all these VLCs here, only VLC.table was really used
after init, so use the ff_vlc_init_tables API
to get rid of them.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-09-20 22:24:18 +02:00
parent 886fbec82f
commit c95e123e8c
1 changed files with 20 additions and 26 deletions
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46
libavcodec/intrax8.c
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@ -45,49 +45,43 @@
#define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS)
#define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS)
static VLC j_ac_vlc[2][2][8]; // [quant < 13], [intra / inter], [select]
static VLC j_dc_vlc[2][8]; // [quant], [select]
static VLC j_orient_vlc[2][4]; // [quant], [select]
static const VLCElem *j_ac_vlc[2][2][8]; // [quant < 13], [intra / inter], [select]
static const VLCElem *j_dc_vlc[2][8]; // [quant], [select]
static const VLCElem *j_orient_vlc[2][4]; // [quant], [select]
static av_cold void x8_init_vlc(VLC *vlc, int nb_bits, int nb_codes,
int *offset, const uint8_t table[][2])
static av_cold const VLCElem *x8_init_vlc(VLCInitState *state, int nb_bits,
int nb_codes, const uint8_t table[][2])
{
static VLCElem vlc_buf[VLC_BUFFER_SIZE];
vlc->table = &vlc_buf[*offset];
vlc->table_allocated = VLC_BUFFER_SIZE - *offset;
ff_vlc_init_from_lengths(vlc, nb_bits, nb_codes, &table[0][1], 2,
&table[0][0], 2, 1, 0, VLC_INIT_STATIC_OVERLONG, NULL);
*offset += vlc->table_size;
return ff_vlc_init_tables_from_lengths(state, nb_bits, nb_codes, &table[0][1], 2,
&table[0][0], 2, 1, 0, 0);
}
static av_cold void x8_vlc_init(void)
{
static VLCElem vlc_buf[VLC_BUFFER_SIZE];
VLCInitState state = VLC_INIT_STATE(vlc_buf);
int i;
int offset = 0;
// set ac tables
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
for (int k = 0; k < 8; k++)
x8_init_vlc(&j_ac_vlc[i][j][k], AC_VLC_BITS, 77,
&offset, x8_ac_quant_table[i][j][k]);
j_ac_vlc[i][j][k] = x8_init_vlc(&state, AC_VLC_BITS, 77,
x8_ac_quant_table[i][j][k]);
// set dc tables
for (int i = 0; i < 2; i++)
for (int j = 0; j < 8; j++)
x8_init_vlc(&j_dc_vlc[i][j], DC_VLC_BITS, 34, &offset,
x8_dc_quant_table[i][j]);
j_dc_vlc[i][j] = x8_init_vlc(&state, DC_VLC_BITS, 34,
x8_dc_quant_table[i][j]);
// set orient tables
for (i = 0; i < 2; i++)
x8_init_vlc(&j_orient_vlc[0][i], OR_VLC_BITS, 12,
&offset, x8_orient_highquant_table[i]);
j_orient_vlc[0][i] = x8_init_vlc(&state, OR_VLC_BITS, 12,
x8_orient_highquant_table[i]);
for (i = 0; i < 4; i++)
x8_init_vlc(&j_orient_vlc[1][i], OR_VLC_BITS, 12,
&offset, x8_orient_lowquant_table[i]);
av_assert2(offset == VLC_BUFFER_SIZE);
j_orient_vlc[1][i] = x8_init_vlc(&state, OR_VLC_BITS, 12,
x8_orient_lowquant_table[i]);
}
static void x8_reset_vlc_tables(IntraX8Context *w)
@ -108,7 +102,7 @@ static inline void x8_select_ac_table(IntraX8Context *const w, int mode)
table_index = get_bits(w->gb, 3);
// 2 modes use same tables
w->j_ac_vlc_table[mode] = j_ac_vlc[w->quant < 13][mode >> 1][table_index].table;
w->j_ac_vlc_table[mode] = j_ac_vlc[w->quant < 13][mode >> 1][table_index];
av_assert2(j_ac_vlc[mode]);
}
@ -116,7 +110,7 @@ static inline int x8_get_orient_vlc(IntraX8Context *w)
{
if (!w->j_orient_vlc_table) {
int table_index = get_bits(w->gb, 1 + (w->quant < 13));
w->j_orient_vlc_table = j_orient_vlc[w->quant < 13][table_index].table;
w->j_orient_vlc_table = j_orient_vlc[w->quant < 13][table_index];
}
return get_vlc2(w->gb, w->j_orient_vlc_table, OR_VLC_BITS, OR_VLC_MTD);
@ -258,7 +252,7 @@ static int x8_get_dc_rlf(IntraX8Context *const w, const int mode,
if (!w->j_dc_vlc_table[mode]) {
int table_index = get_bits(w->gb, 3);
// 4 modes, same table
w->j_dc_vlc_table[mode] = j_dc_vlc[w->quant < 13][table_index].table;
w->j_dc_vlc_table[mode] = j_dc_vlc[w->quant < 13][table_index];
}
i = get_vlc2(w->gb, w->j_dc_vlc_table[mode], DC_VLC_BITS, DC_VLC_MTD);