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avcodec/rv60dec: Avoid branch when decoding cbp16

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Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-05-18 23:12:03 +02:00
parent d5a9f7bdd4
commit 66f5323652
1 changed files with 4 additions and 7 deletions
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11
libavcodec/rv60dec.c
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@ -82,7 +82,7 @@ enum {
};
static const VLCElem * cbp8_vlc[7][4];
static const VLCElem * cbp16_vlc[7][3][4];
static const VLCElem * cbp16_vlc[7][4][4];
typedef struct {
const VLCElem * l0[2];
@ -137,12 +137,12 @@ static av_cold void rv60_init_static_data(void)
for (int i = 0; i < 7; i++)
for (int j = 0; j < 4; j++)
cbp8_vlc[i][j] = gen_vlc(rv60_cbp8_lens[i][j], 64, &state);
cbp16_vlc[i][0][j] = cbp8_vlc[i][j] = gen_vlc(rv60_cbp8_lens[i][j], 64, &state);
for (int i = 0; i < 7; i++)
for (int j = 0; j < 3; j++)
for (int k = 0; k < 4; k++)
cbp16_vlc[i][j][k] = gen_vlc(rv60_cbp16_lens[i][j][k], 64, &state);
cbp16_vlc[i][j + 1][k] = gen_vlc(rv60_cbp16_lens[i][j][k], 64, &state);
build_coeff_vlc(rv60_intra_lens, intra_coeff_vlc, 5, &state);
build_coeff_vlc(rv60_inter_lens, inter_coeff_vlc, 7, &state);
@ -1650,10 +1650,7 @@ static int decode_super_cbp(GetBitContext * gb, const VLCElem * vlc[4])
static int decode_cbp16(GetBitContext * gb, int subset, int qp)
{
int cb_set = rv60_qp_to_idx[qp];
if (!subset)
return decode_super_cbp(gb, cbp8_vlc[cb_set]);
else
return decode_super_cbp(gb, cbp16_vlc[cb_set][subset - 1]);
return decode_super_cbp(gb, cbp16_vlc[cb_set][subset]);
}
static int decode_cu_r(RV60Context * s, AVFrame * frame, ThreadContext * thread, GetBitContext * gb, int xpos, int ypos, int log_size, int qp, int sel_qp)