* Encode NELLY_SAMPLES samples. It assumes, that samples contains 3 * NELLY_BUF_LEN values * @param s encoder context * @param output output buffer * @param output_size size of output buffer */
| 305 | * @param output_size size of output buffer |
| 306 | */ |
| 307 | static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int output_size) |
| 308 | { |
| 309 | PutBitContext pb; |
| 310 | int i, j, band, block, best_idx, power_idx = 0; |
| 311 | float power_val, coeff, coeff_sum; |
| 312 | float pows[NELLY_FILL_LEN]; |
| 313 | int bits[NELLY_BUF_LEN], idx_table[NELLY_BANDS]; |
| 314 | float cand[NELLY_BANDS]; |
| 315 | |
| 316 | apply_mdct(s); |
| 317 | |
| 318 | init_put_bits(&pb, output, output_size); |
| 319 | |
| 320 | i = 0; |
| 321 | for (band = 0; band < NELLY_BANDS; band++) { |
| 322 | coeff_sum = 0; |
| 323 | for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) { |
| 324 | coeff_sum += s->mdct_out[i ] * s->mdct_out[i ] |
| 325 | + s->mdct_out[i + NELLY_BUF_LEN] * s->mdct_out[i + NELLY_BUF_LEN]; |
| 326 | } |
| 327 | cand[band] = |
| 328 | log2(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0; |
| 329 | } |
| 330 | |
| 331 | if (s->avctx->trellis) { |
| 332 | get_exponent_dynamic(s, cand, idx_table); |
| 333 | } else { |
| 334 | get_exponent_greedy(s, cand, idx_table); |
| 335 | } |
| 336 | |
| 337 | i = 0; |
| 338 | for (band = 0; band < NELLY_BANDS; band++) { |
| 339 | if (band) { |
| 340 | power_idx += ff_nelly_delta_table[idx_table[band]]; |
| 341 | put_bits(&pb, 5, idx_table[band]); |
| 342 | } else { |
| 343 | power_idx = ff_nelly_init_table[idx_table[0]]; |
| 344 | put_bits(&pb, 6, idx_table[0]); |
| 345 | } |
| 346 | power_val = pow_table[power_idx & 0x7FF] / (1 << ((power_idx >> 11) + POW_TABLE_OFFSET)); |
| 347 | for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) { |
| 348 | s->mdct_out[i] *= power_val; |
| 349 | s->mdct_out[i + NELLY_BUF_LEN] *= power_val; |
| 350 | pows[i] = power_idx; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | ff_nelly_get_sample_bits(pows, bits); |
| 355 | |
| 356 | for (block = 0; block < 2; block++) { |
| 357 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 358 | if (bits[i] > 0) { |
| 359 | const float *table = ff_nelly_dequantization_table + (1 << bits[i]) - 1; |
| 360 | coeff = s->mdct_out[block * NELLY_BUF_LEN + i]; |
| 361 | best_idx = |
| 362 | quant_lut[av_clip ( |
| 363 | coeff * quant_lut_mul[bits[i]] + quant_lut_add[bits[i]], |
| 364 | quant_lut_offset[bits[i]], |
no test coverage detected