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avcodec/vvc/cabac: add 9.3.3.7 Fixed-length binarization process

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Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
This commit is contained in:
Wu Jianhua
2025-05-14 21:40:09 +08:00
committed by Nuo Mi
parent 02fe29fa39
commit a7320efa2b
1 changed files with 14 additions and 14 deletions
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28
libavcodec/vvc/cabac.c
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@ -968,6 +968,17 @@ static int limited_kth_order_egk_decode(CABACContext *c, const int k, const int
return val; return val;
} }
// 9.3.3.7 Fixed-length binarization process
static int fixed_length_decode(CABACContext* c, const int len)
{
int value = 0;
for (int i = 0; i < len; i++)
value = (value << 1) | get_cabac_bypass(c);
return value;
}
static av_always_inline static av_always_inline
void get_left_top(const VVCLocalContext *lc, uint8_t *left, uint8_t *top, void get_left_top(const VVCLocalContext *lc, uint8_t *left, uint8_t *top,
const int x0, const int y0, const uint8_t *left_ctx, const uint8_t *top_ctx) const int x0, const int y0, const uint8_t *left_ctx, const uint8_t *top_ctx)
@ -1011,11 +1022,7 @@ int ff_vvc_sao_type_idx_decode(VVCLocalContext *lc)
int ff_vvc_sao_band_position_decode(VVCLocalContext *lc) int ff_vvc_sao_band_position_decode(VVCLocalContext *lc)
{ {
int value = get_cabac_bypass(&lc->ep->cc); return fixed_length_decode(&lc->ep->cc, 5);
for (int i = 0; i < 4; i++)
value = (value << 1) | get_cabac_bypass(&lc->ep->cc);
return value;
} }
int ff_vvc_sao_offset_abs_decode(VVCLocalContext *lc) int ff_vvc_sao_offset_abs_decode(VVCLocalContext *lc)
@ -1035,9 +1042,7 @@ int ff_vvc_sao_offset_sign_decode(VVCLocalContext *lc)
int ff_vvc_sao_eo_class_decode(VVCLocalContext *lc) int ff_vvc_sao_eo_class_decode(VVCLocalContext *lc)
{ {
int ret = get_cabac_bypass(&lc->ep->cc) << 1; return (get_cabac_bypass(&lc->ep->cc) << 1) | get_cabac_bypass(&lc->ep->cc);
ret |= get_cabac_bypass(&lc->ep->cc);
return ret;
} }
int ff_vvc_alf_ctb_flag(VVCLocalContext *lc, const int rx, const int ry, const int c_idx) int ff_vvc_alf_ctb_flag(VVCLocalContext *lc, const int rx, const int ry, const int c_idx)
@ -1479,12 +1484,7 @@ int ff_vvc_merge_idx(VVCLocalContext *lc)
int ff_vvc_merge_gpm_partition_idx(VVCLocalContext *lc) int ff_vvc_merge_gpm_partition_idx(VVCLocalContext *lc)
{ {
int i = 0; return fixed_length_decode(&lc->ep->cc, 6);
for (int j = 0; j < 6; j++)
i = (i << 1) | get_cabac_bypass(&lc->ep->cc);
return i;
} }
int ff_vvc_merge_gpm_idx(VVCLocalContext *lc, const int idx) int ff_vvc_merge_gpm_idx(VVCLocalContext *lc, const int idx)