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avcodec/h261dec: Avoid superfluous VLC structures 

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 19:18:34 +02:00
parent 363837de0e
commit 5a9e185dfc
1 changed files with 20 additions and 20 deletions
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40
libavcodec/h261dec.c
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@ -44,10 +44,10 @@
#define MBA_STUFFING 33
#define MBA_STARTCODE 34
static VLC h261_mba_vlc;
static VLC h261_mtype_vlc;
static VLC h261_mv_vlc;
static VLC h261_cbp_vlc;
static VLCElem h261_mba_vlc[540];
static VLCElem h261_mtype_vlc[80];
static VLCElem h261_mv_vlc[144];
static VLCElem h261_cbp_vlc[512];
typedef struct H261DecContext {
MpegEncContext s;
@ -64,18 +64,18 @@ typedef struct H261DecContext {
static av_cold void h261_decode_init_static(void)
{
VLC_INIT_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
ff_h261_mba_bits, 1, 1,
ff_h261_mba_code, 1, 1, 540);
VLC_INIT_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
ff_h261_mtype_bits, 1, 1,
ff_h261_mtype_code, 1, 1, 80);
VLC_INIT_STATIC(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
&ff_h261_mv_tab[0][1], 2, 1,
&ff_h261_mv_tab[0][0], 2, 1, 144);
VLC_INIT_STATIC(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
&ff_h261_cbp_tab[0][1], 2, 1,
&ff_h261_cbp_tab[0][0], 2, 1, 512);
VLC_INIT_STATIC_TABLE(h261_mba_vlc, H261_MBA_VLC_BITS, 35,
ff_h261_mba_bits, 1, 1,
ff_h261_mba_code, 1, 1, 0);
VLC_INIT_STATIC_TABLE(h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
ff_h261_mtype_bits, 1, 1,
ff_h261_mtype_code, 1, 1, 0);
VLC_INIT_STATIC_TABLE(h261_mv_vlc, H261_MV_VLC_BITS, 17,
&ff_h261_mv_tab[0][1], 2, 1,
&ff_h261_mv_tab[0][0], 2, 1, 0);
VLC_INIT_STATIC_TABLE(h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
&ff_h261_cbp_tab[0][1], 2, 1,
&ff_h261_cbp_tab[0][0], 2, 1, 0);
INIT_FIRST_VLC_RL(ff_h261_rl_tcoeff, 552);
}
@ -253,7 +253,7 @@ static const int mvmap[17] = {
static int decode_mv_component(GetBitContext *gb, int v)
{
int mv_diff = get_vlc2(gb, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
int mv_diff = get_vlc2(gb, h261_mv_vlc, H261_MV_VLC_BITS, 2);
/* check if mv_diff is valid */
if (mv_diff < 0)
@ -378,7 +378,7 @@ static int h261_decode_mb(H261DecContext *h)
cbp = 63;
// Read mba
do {
h->mba_diff = get_vlc2(&s->gb, h261_mba_vlc.table,
h->mba_diff = get_vlc2(&s->gb, h261_mba_vlc,
H261_MBA_VLC_BITS, 2);
/* Check for slice end */
@ -409,7 +409,7 @@ static int h261_decode_mb(H261DecContext *h)
h261_init_dest(s);
// Read mtype
com->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
com->mtype = get_vlc2(&s->gb, h261_mtype_vlc, H261_MTYPE_VLC_BITS, 2);
if (com->mtype < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid mtype index %d\n",
com->mtype);
@ -449,7 +449,7 @@ static int h261_decode_mb(H261DecContext *h)
// Read cbp
if (HAS_CBP(com->mtype))
cbp = get_vlc2(&s->gb, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 1) + 1;
cbp = get_vlc2(&s->gb, h261_cbp_vlc, H261_CBP_VLC_BITS, 1) + 1;
if (s->mb_intra) {
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;