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avcodec/proresenc_kostya: save a few operations in DC encoding

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This matches the logic from proresenc_anatoliy.
This commit is contained in:
Clément Bœsch 2023-12-11 01:19:56 +01:00
parent f06f2cf16a
commit 631fa19ee0
1 changed files with 6 additions and 15 deletions
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21
libavcodec/proresenc_kostya.c
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@ -135,13 +135,6 @@ static const uint8_t prores_quant_matrices[][64] = {
},
};
static const uint8_t prores_dc_codebook[4] = {
0x04, // rice_order = 0, exp_golomb_order = 1, switch_bits = 0
0x28, // rice_order = 1, exp_golomb_order = 2, switch_bits = 0
0x4D, // rice_order = 2, exp_golomb_order = 3, switch_bits = 1
0x70 // rice_order = 3, exp_golomb_order = 4, switch_bits = 0
};
#define NUM_MB_LIMITS 4
static const int prores_mb_limits[NUM_MB_LIMITS] = {
1620, // up to 720x576
@ -416,7 +409,7 @@ static void encode_dcs(PutBitContext *pb, int16_t *blocks,
int blocks_per_slice, int scale)
{
int i;
int codebook = 3, code, dc, prev_dc, delta, sign, new_sign;
int codebook = 5, code, dc, prev_dc, delta, sign, new_sign;
prev_dc = (blocks[0] - 0x4000) / scale;
encode_vlc_codeword(pb, FIRST_DC_CB, MAKE_CODE(prev_dc));
@ -429,9 +422,8 @@ static void encode_dcs(PutBitContext *pb, int16_t *blocks,
new_sign = GET_SIGN(delta);
delta = (delta ^ sign) - sign;
code = MAKE_CODE(delta);
encode_vlc_codeword(pb, prores_dc_codebook[codebook], code);
codebook = (code + (code & 1)) >> 1;
codebook = FFMIN(codebook, 3);
encode_vlc_codeword(pb, ff_prores_dc_codebook[codebook], code);
codebook = FFMIN(code, 6);
sign = new_sign;
prev_dc = dc;
}
@ -649,7 +641,7 @@ static int estimate_dcs(int *error, int16_t *blocks, int blocks_per_slice,
int scale)
{
int i;
int codebook = 3, code, dc, prev_dc, delta, sign, new_sign;
int codebook = 5, code, dc, prev_dc, delta, sign, new_sign;
int bits;
prev_dc = (blocks[0] - 0x4000) / scale;
@ -665,9 +657,8 @@ static int estimate_dcs(int *error, int16_t *blocks, int blocks_per_slice,
new_sign = GET_SIGN(delta);
delta = (delta ^ sign) - sign;
code = MAKE_CODE(delta);
bits += estimate_vlc(prores_dc_codebook[codebook], code);
codebook = (code + (code & 1)) >> 1;
codebook = FFMIN(codebook, 3);
bits += estimate_vlc(ff_prores_dc_codebook[codebook], code);
codebook = FFMIN(code, 6);
sign = new_sign;
prev_dc = dc;
}