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New cabac coding function: kvz_cabac_encode_trunc_bin

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This commit is contained in:
Marko Viitanen 2019-03-20 15:17:54 +02:00
parent 80d6e4bf05
commit f3acd245ae
2 changed files with 42 additions and 0 deletions
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41
src/cabac.c
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@ -76,6 +76,17 @@ const uint8_t kvz_g_auc_renorm_table[32] =
6, 5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
const uint8_t kvz_tb_max[257] = { 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8 };
/**
* \brief Initialize struct cabac_data.
@ -214,6 +225,36 @@ void kvz_cabac_encode_bin_trm(cabac_data_t * const data, const uint8_t bin_value
}
}
/**
* \brief encode truncated binary code
*/
void kvz_cabac_encode_trunc_bin(cabac_data_t * const data, const uint32_t bin_value, const uint32_t max_value) {
int thresh;
int symbol = bin_value;
if (max_value > 256) {
int threshVal = 1 << 8;
thresh = 8;
while (threshVal <= max_value) {
thresh++;
threshVal <<= 1;
}
thresh--;
} else {
thresh = kvz_tb_max[max_value];
}
int val = 1 << thresh;
int b = max_value - val;
if (symbol < val - b) {
CABAC_BINS_EP(data, symbol, thresh, "TruncSymbols");
} else {
symbol += val - b;
CABAC_BINS_EP(data, symbol, thresh + 1, "TruncSymbols");
}
}
/**
* \brief
*/

1
src/cabac.h
View file

@ -104,6 +104,7 @@ extern const uint8_t kvz_g_auc_renorm_table[32];
void kvz_cabac_start(cabac_data_t *data);
void kvz_cabac_encode_bin(cabac_data_t *data, uint32_t bin_value);
void kvz_cabac_encode_bin_ep(cabac_data_t *data, uint32_t bin_value);
void kvz_cabac_encode_trunc_bin(cabac_data_t *data, uint32_t bin_value, uint32_t max_value);
void kvz_cabac_encode_bins_ep(cabac_data_t *data, uint32_t bin_values, int num_bins);
void kvz_cabac_encode_bin_trm(cabac_data_t *data, uint8_t bin_value);
void kvz_cabac_write(cabac_data_t *data);