| 148 | } |
| 149 | |
| 150 | static int read_table(GetBitContext *gb, Table *t, const int8_t code_pred_coeff[3][3], |
| 151 | int length_bits, int coeff_bits, int is_signed, int offset) |
| 152 | { |
| 153 | unsigned int i, j, k; |
| 154 | for (i = 0; i < t->elements; i++) { |
| 155 | t->length[i] = get_bits(gb, length_bits) + 1; |
| 156 | if (!get_bits1(gb)) { |
| 157 | read_uncoded_coeff(gb, t->coeff[i], t->length[i], coeff_bits, is_signed, offset); |
| 158 | } else { |
| 159 | int method = get_bits(gb, 2), lsb_size; |
| 160 | if (method == 3) |
| 161 | return AVERROR_INVALIDDATA; |
| 162 | |
| 163 | read_uncoded_coeff(gb, t->coeff[i], method + 1, coeff_bits, is_signed, offset); |
| 164 | |
| 165 | lsb_size = get_bits(gb, 3); |
| 166 | for (j = method + 1; j < t->length[i]; j++) { |
| 167 | int c, x = 0; |
| 168 | for (k = 0; k < method + 1; k++) |
| 169 | x += code_pred_coeff[method][k] * (unsigned)t->coeff[i][j - k - 1]; |
| 170 | c = get_sr_golomb_dst(gb, lsb_size); |
| 171 | if (x >= 0) |
| 172 | c -= (x + 4) / 8; |
| 173 | else |
| 174 | c += (-x + 3) / 8; |
| 175 | if (!is_signed) { |
| 176 | if (c < offset || c >= offset + (1<<coeff_bits)) |
| 177 | return AVERROR_INVALIDDATA; |
| 178 | } |
| 179 | t->coeff[i][j] = c; |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | static void ac_init(ArithCoder *ac, GetBitContext *gb) |
| 187 | { |
no test coverage detected