| … | |
… | |
| 648 | { |
648 | { |
| 649 | int i; |
649 | int i; |
| 650 | AV *av, *result; |
650 | AV *av, *result; |
| 651 | |
651 | |
| 652 | if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV) |
652 | if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV) |
| 653 | croak ("Not an array ref as first argument to make_histogram"); |
653 | croak ("Not an array ref as first argument to extract_features"); |
| 654 | |
654 | |
| 655 | av = (AV *) SvRV (ar); |
655 | av = (AV *) SvRV (ar); |
| 656 | result = newAV (); |
656 | result = newAV (); |
| 657 | |
657 | |
| 658 | for (i = 0; i <= av_len (av); ++i) |
658 | for (i = 0; i <= av_len (av); ++i) |
| … | |
… | |
| 721 | RETVAL = newRV_noinc ((SV *)result); |
721 | RETVAL = newRV_noinc ((SV *)result); |
| 722 | } |
722 | } |
| 723 | OUTPUT: |
723 | OUTPUT: |
| 724 | RETVAL |
724 | RETVAL |
| 725 | |
725 | |
| 726 | SV * |
|
|
| 727 | make_histograms (SV *ar) |
|
|
| 728 | CODE: |
|
|
| 729 | { |
|
|
| 730 | int i; |
|
|
| 731 | AV *av, *result; |
|
|
| 732 | |
|
|
| 733 | if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV) |
|
|
| 734 | croak ("Not an array ref as first argument to make_histogram"); |
|
|
| 735 | |
|
|
| 736 | av = (AV *) SvRV (ar); |
|
|
| 737 | result = newAV (); |
|
|
| 738 | |
|
|
| 739 | for (i = 0; i <= av_len (av); ++i) |
|
|
| 740 | { |
|
|
| 741 | const int HISTSIZE = 64; |
|
|
| 742 | |
|
|
| 743 | int j; |
|
|
| 744 | SV *sv = *av_fetch (av, i, 1); |
|
|
| 745 | STRLEN len; |
|
|
| 746 | char *buf = SvPVbyte (sv, len); |
|
|
| 747 | |
|
|
| 748 | int tmphist[HISTSIZE]; |
|
|
| 749 | float *hist; |
|
|
| 750 | |
|
|
| 751 | SV *histsv = newSV (HISTSIZE * sizeof (float) + 1); |
|
|
| 752 | SvPOK_on (histsv); |
|
|
| 753 | SvCUR_set (histsv, HISTSIZE * sizeof (float)); |
|
|
| 754 | hist = (float *)SvPVX (histsv); |
|
|
| 755 | |
|
|
| 756 | Zero (tmphist, sizeof (tmphist), char); |
|
|
| 757 | |
|
|
| 758 | for (j = len; j--; ) |
|
|
| 759 | { |
|
|
| 760 | unsigned int idx |
|
|
| 761 | = ((*buf & 0xc0) >> 2) |
|
|
| 762 | | ((*buf & 0x18) >> 1) |
|
|
| 763 | | (*buf & 0x03); |
|
|
| 764 | |
|
|
| 765 | ++tmphist[idx]; |
|
|
| 766 | ++buf; |
|
|
| 767 | } |
|
|
| 768 | |
|
|
| 769 | for (j = 0; j < HISTSIZE; ++j) |
|
|
| 770 | hist[j] = (float)tmphist[j] / (len + 1e-30); |
|
|
| 771 | |
|
|
| 772 | av_push (result, histsv); |
|
|
| 773 | } |
|
|
| 774 | |
|
|
| 775 | RETVAL = newRV_noinc ((SV *)result); |
|
|
| 776 | } |
|
|
| 777 | OUTPUT: |
|
|
| 778 | RETVAL |
|
|
| 779 | |
|
|
| 780 | |
|
|
