| 346 | } |
| 347 | |
| 348 | static int get_bit_length(H2645NAL *nal, int min_size, int skip_trailing_zeros) |
| 349 | { |
| 350 | int size = nal->size; |
| 351 | int trailing_padding = 0; |
| 352 | |
| 353 | while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0) |
| 354 | size--; |
| 355 | |
| 356 | if (!size) |
| 357 | return 0; |
| 358 | |
| 359 | if (size <= min_size) { |
| 360 | if (nal->size < min_size) |
| 361 | return AVERROR_INVALIDDATA; |
| 362 | size = min_size; |
| 363 | } else { |
| 364 | int v = nal->data[size - 1]; |
| 365 | /* remove the stop bit and following trailing zeros, |
| 366 | * or nothing for damaged bitstreams */ |
| 367 | if (v) |
| 368 | trailing_padding = ff_ctz(v) + 1; |
| 369 | } |
| 370 | |
| 371 | if (size > INT_MAX / 8) |
| 372 | return AVERROR(ERANGE); |
| 373 | size *= 8; |
| 374 | |
| 375 | return size - trailing_padding; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit, |
no outgoing calls
no test coverage detected