| 330 | } |
| 331 | |
| 332 | void MathStack::get_math_envelope_section(EnvelopeSection &s, |
| 333 | uint64_t start, uint64_t end, float min_length) |
| 334 | { |
| 335 | assert(end <= get_sample_num()); |
| 336 | assert(start <= end); |
| 337 | assert(min_length > 0); |
| 338 | |
| 339 | if (!_envelope_done) { |
| 340 | s.length = 0; |
| 341 | return; |
| 342 | } |
| 343 | |
| 344 | const unsigned int min_level = max((int)floorf(logf(min_length) / |
| 345 | LogEnvelopeScaleFactor) - 1, 0); |
| 346 | const unsigned int scale_power = (min_level + 1) * |
| 347 | EnvelopeScalePower; |
| 348 | start >>= scale_power; |
| 349 | end >>= scale_power; |
| 350 | |
| 351 | s.start = start << scale_power; |
| 352 | s.scale = 1 << scale_power; |
| 353 | if (_envelope_level[min_level].length == 0) |
| 354 | s.length = 0; |
| 355 | else |
| 356 | s.length = end - start; |
| 357 | |
| 358 | s.samples = _envelope_level[min_level].samples + start; |
| 359 | } |
| 360 | |
| 361 | void MathStack::calc_math(uint64_t mathFactor) |
| 362 | { |