Function build_modpred

libavcodec/indeo3.c:63–95

static const uint8_t corrector_type_2[8] = { 9, 7, 6, 8, 5, 4, 3, 2 };

static av_cold int build_modpred(Indeo3DecodeContext *s)
{
    int i, j;

    if (!(s->ModPred = av_malloc(8 * 128)))
        return AVERROR(ENOMEM);

    for (i=0; i < 128; ++i) {
        s->ModPred[i+0*128] = i >  126 ? 254 : 2*(i + 1 - ((i + 1) % 2));
        s->ModPred[i+1*128] = i ==   7 ?  20 :
                              i == 119 ||
                              i == 120 ? 236 : 2*(i + 2 - ((i + 1) % 3));
        s->ModPred[i+2*128] = i >  125 ? 248 : 2*(i + 2 - ((i + 2) % 4));
        s->ModPred[i+3*128] =                  2*(i + 1 - ((i - 3) % 5));
        s->ModPred[i+4*128] = i ==   8 ?  20 : 2*(i + 1 - ((i - 3) % 6));
        s->ModPred[i+5*128] =                  2*(i + 4 - ((i + 3) % 7));
        s->ModPred[i+6*128] = i >  123 ? 240 : 2*(i + 4 - ((i + 4) % 8));
        s->ModPred[i+7*128] =                  2*(i + 5 - ((i + 4) % 9));
    }

    if (!(s->corrector_type = av_malloc(24 * 256)))
        return AVERROR(ENOMEM);

    for (i=0; i < 24; ++i) {
        for (j=0; j < 256; ++j) {
            s->corrector_type[i*256+j] = j < corrector_type_0[i]          ? 1 :
                                         j < 248 || (i == 16 && j == 248) ? 0 :
                                         corrector_type_2[j - 248];
        }
    }

  return 0;
}

static av_cold int iv_alloc_frames(Indeo3DecodeContext *s)
{