| 501 | #define DC_START_BITS 11 |
| 502 | |
| 503 | static int read_dcs(AVCodecContext *avctx, GetBitContext *gb, Bundle *b, |
| 504 | int start_bits, int has_sign) |
| 505 | { |
| 506 | int i, j, len, len2, bsize, sign, v, v2; |
| 507 | int16_t *dst = (int16_t*)b->cur_dec; |
| 508 | int16_t *dst_end = (int16_t*)b->data_end; |
| 509 | |
| 510 | CHECK_READ_VAL(gb, b, len); |
| 511 | if (get_bits_left(gb) < start_bits - has_sign) |
| 512 | return AVERROR_INVALIDDATA; |
| 513 | v = get_bits(gb, start_bits - has_sign); |
| 514 | if (v && has_sign) { |
| 515 | sign = -get_bits1(gb); |
| 516 | v = (v ^ sign) - sign; |
| 517 | } |
| 518 | if (dst_end - dst < 1) |
| 519 | return AVERROR_INVALIDDATA; |
| 520 | *dst++ = v; |
| 521 | len--; |
| 522 | for (i = 0; i < len; i += 8) { |
| 523 | len2 = FFMIN(len - i, 8); |
| 524 | if (dst_end - dst < len2) |
| 525 | return AVERROR_INVALIDDATA; |
| 526 | bsize = get_bits(gb, 4); |
| 527 | if (bsize) { |
| 528 | for (j = 0; j < len2; j++) { |
| 529 | v2 = get_bits(gb, bsize); |
| 530 | if (v2) { |
| 531 | sign = -get_bits1(gb); |
| 532 | v2 = (v2 ^ sign) - sign; |
| 533 | } |
| 534 | v += v2; |
| 535 | *dst++ = v; |
| 536 | if (v < -32768 || v > 32767) { |
| 537 | av_log(avctx, AV_LOG_ERROR, "DC value went out of bounds: %d\n", v); |
| 538 | return AVERROR_INVALIDDATA; |
| 539 | } |
| 540 | } |
| 541 | } else { |
| 542 | for (j = 0; j < len2; j++) |
| 543 | *dst++ = v; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | b->cur_dec = (uint8_t*)dst; |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * Retrieve next value from bundle. |
no test coverage detected