* Decode Bink Audio block * @param[out] out Output buffer (must contain s->block_size elements) */
| 152 | * @param[out] out Output buffer (must contain s->block_size elements) |
| 153 | */ |
| 154 | static void decode_block(BinkAudioContext *s, short *out, int use_dct) |
| 155 | { |
| 156 | int ch, i, j, k; |
| 157 | float q, quant[25]; |
| 158 | int width, coeff; |
| 159 | GetBitContext *gb = &s->gb; |
| 160 | |
| 161 | if (use_dct) |
| 162 | skip_bits(gb, 2); |
| 163 | |
| 164 | for (ch = 0; ch < s->channels; ch++) { |
| 165 | FFTSample *coeffs = s->coeffs_ptr[ch]; |
| 166 | q = 0.0f; |
| 167 | coeffs[0] = get_float(gb) * s->root; |
| 168 | coeffs[1] = get_float(gb) * s->root; |
| 169 | |
| 170 | for (i = 0; i < s->num_bands; i++) { |
| 171 | /* constant is result of 0.066399999/log10(M_E) */ |
| 172 | int value = get_bits(gb, 8); |
| 173 | quant[i] = expf(FFMIN(value, 95) * 0.15289164787221953823f) * s->root; |
| 174 | } |
| 175 | |
| 176 | // find band (k) |
| 177 | for (k = 0; s->bands[k] < 1; k++) { |
| 178 | q = quant[k]; |
| 179 | } |
| 180 | |
| 181 | // parse coefficients |
| 182 | i = 2; |
| 183 | while (i < s->frame_len) { |
| 184 | if (get_bits1(gb)) { |
| 185 | j = i + rle_length_tab[get_bits(gb, 4)] * 8; |
| 186 | } else { |
| 187 | j = i + 8; |
| 188 | } |
| 189 | |
| 190 | j = FFMIN(j, s->frame_len); |
| 191 | |
| 192 | width = get_bits(gb, 4); |
| 193 | if (width == 0) { |
| 194 | memset(coeffs + i, 0, (j - i) * sizeof(*coeffs)); |
| 195 | i = j; |
| 196 | while (s->bands[k] * 2 < i) |
| 197 | q = quant[k++]; |
| 198 | } else { |
| 199 | while (i < j) { |
| 200 | if (s->bands[k] * 2 == i) |
| 201 | q = quant[k++]; |
| 202 | coeff = get_bits(gb, width); |
| 203 | if (coeff) { |
| 204 | if (get_bits1(gb)) |
| 205 | coeffs[i] = -q * coeff; |
| 206 | else |
| 207 | coeffs[i] = q * coeff; |
| 208 | } else { |
| 209 | coeffs[i] = 0.0f; |
| 210 | } |
| 211 | i++; |
no test coverage detected