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avcodec/proresenc_anatoliy: shuffle encode_codeword() code to match Kostya encoder

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Code is functionally identical, it's just rename of variables, cosmetics
and branch logic shuffling.
This commit is contained in:
Clément Bœsch 2023-12-11 01:32:58 +01:00
parent 3885d2493d
commit 1832bd7838
1 changed files with 20 additions and 19 deletions
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39
libavcodec/proresenc_anatoliy.c
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@ -226,31 +226,32 @@ static int int_from_list_or_default(void *ctx, const char *val_name, int val,
return default_value;
}
static void encode_codeword(PutBitContext *pb, int val, int codebook)
static void encode_codeword(PutBitContext *pb, int val, unsigned codebook)
{
unsigned int rice_order, exp_order, switch_bits, first_exp, exp, zeros;
unsigned int rice_order, exp_order, switch_bits, switch_val;
int exponent;
/* number of bits to switch between rice and exp golomb */
switch_bits = codebook & 3;
rice_order = codebook >> 5;
exp_order = (codebook >> 2) & 7;
/* number of prefix bits to switch between Rice and expGolomb */
switch_bits = (codebook & 3) + 1;
rice_order = codebook >> 5; /* rice code order */
exp_order = (codebook >> 2) & 7; /* exp golomb code order */
first_exp = ((switch_bits + 1) << rice_order);
switch_val = switch_bits << rice_order;
if (val >= first_exp) { /* exp golomb */
val -= first_exp;
val += (1 << exp_order);
exp = av_log2(val);
zeros = exp - exp_order + switch_bits + 1;
put_bits(pb, zeros, 0);
put_bits(pb, exp + 1, val);
} else if (rice_order) {
put_bits(pb, (val >> rice_order), 0);
put_bits(pb, 1, 1);
put_sbits(pb, rice_order, val);
if (val >= switch_val) {
val -= switch_val - (1 << exp_order);
exponent = av_log2(val);
put_bits(pb, exponent - exp_order + switch_bits, 0);
put_bits(pb, exponent + 1, val);
} else {
put_bits(pb, val, 0);
exponent = val >> rice_order;
if (exponent)
put_bits(pb, exponent, 0);
put_bits(pb, 1, 1);
if (rice_order)
put_sbits(pb, rice_order, val);
}
}