UnpackSFMPEG1()

static void fl::third_party::UnpackSFMPEG1 ( BitStreamInfo * bsi, SideInfoSub * sis, ScaleFactorInfoSub * sfis, int32_t * scfsi, int gr, ScaleFactorInfoSub * sfisGr0 )

static

Definition at line 85 of file scalfact.hpp.

{
    int sfb;
    int slen0, slen1;
    
    /* these can be 0, so make sure GetBits(bsi, 0) returns 0 (no >> 32 or anything) */
    slen0 = (int)SFLenTab[sis->sfCompress][0];
    slen1 = (int)SFLenTab[sis->sfCompress][1];
    
    if (sis->blockType == 2) {
        /* short block, type 2 (implies winSwitchFlag == 1) */
        if (sis->mixedBlock) {          
            /* do long block portion */
            for (sfb = 0; sfb < 8; sfb++)
                sfis->l[sfb] =    (char)GetBits(bsi, slen0);
            sfb = 3;
        } else {
            /* all short blocks */
            sfb = 0;
        }
 
        for (      ; sfb < 6; sfb++) {
            sfis->s[sfb][0] = (char)GetBits(bsi, slen0);
            sfis->s[sfb][1] = (char)GetBits(bsi, slen0);
            sfis->s[sfb][2] = (char)GetBits(bsi, slen0);
        }
 
        for (      ; sfb < 12; sfb++) {
            sfis->s[sfb][0] = (char)GetBits(bsi, slen1);
            sfis->s[sfb][1] = (char)GetBits(bsi, slen1);
            sfis->s[sfb][2] = (char)GetBits(bsi, slen1);
        }
 
        /* last sf band not transmitted */
        sfis->s[12][0] = sfis->s[12][1] = sfis->s[12][2] = 0;
    } else {
        /* long blocks, type 0, 1, or 3 */
        if(gr == 0) {
            /* first granule */
            for (sfb = 0;  sfb < 11; sfb++) 
                sfis->l[sfb] = (char)GetBits(bsi, slen0);
            for (sfb = 11; sfb < 21; sfb++) 
                sfis->l[sfb] = (char)GetBits(bsi, slen1);
            return;
        } else {
            /* second granule
             * scfsi: 0 = different scalefactors for each granule, 1 = copy sf's from granule 0 into granule 1 
             * for block type == 2, scfsi is always 0
             */
            sfb = 0;
            if(scfsi[0])  for(  ; sfb < 6 ; sfb++) sfis->l[sfb] = sfisGr0->l[sfb];
            else          for(  ; sfb < 6 ; sfb++) sfis->l[sfb] = (char)GetBits(bsi, slen0);
            if(scfsi[1])  for(  ; sfb <11 ; sfb++) sfis->l[sfb] = sfisGr0->l[sfb];
            else          for(  ; sfb <11 ; sfb++) sfis->l[sfb] = (char)GetBits(bsi, slen0);
            if(scfsi[2])  for(  ; sfb <16 ; sfb++) sfis->l[sfb] = sfisGr0->l[sfb];
            else          for(  ; sfb <16 ; sfb++) sfis->l[sfb] = (char)GetBits(bsi, slen1);
            if(scfsi[3])  for(  ; sfb <21 ; sfb++) sfis->l[sfb] = sfisGr0->l[sfb];
            else          for(  ; sfb <21 ; sfb++) sfis->l[sfb] = (char)GetBits(bsi, slen1);
        }
        /* last sf band not transmitted */
        sfis->l[21] = 0;
        sfis->l[22] = 0;
    }
}

References FL_NOEXCEPT, GetBits(), and SFLenTab.

Referenced by UnpackScaleFactors().

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