Function bit_allocation

libavcodec/imc.c:298–458

* Perform bit allocation depending on bits available */

 * Perform bit allocation depending on bits available
 */
static int bit_allocation (IMCContext* q, int stream_format_code, int freebits, int flag) {
    int i, j;
    const float limit = -1.e20;
    float highest = 0.0;
    int indx;
    int t1 = 0;
    int t2 = 1;
    float summa = 0.0;
    int iacc = 0;
    int summer = 0;
    int rres, cwlen;
    float lowest = 1.e10;
    int low_indx = 0;
    float workT[32];
    int flg;
    int found_indx = 0;

    for(i = 0; i < BANDS; i++)
        highest = FFMAX(highest, q->flcoeffs1[i]);

    for(i = 0; i < BANDS-1; i++) {
        q->flcoeffs4[i] = q->flcoeffs3[i] - log(q->flcoeffs5[i])/log(2);
    }
    q->flcoeffs4[BANDS - 1] = limit;

    highest = highest * 0.25;

    for(i = 0; i < BANDS; i++) {
        indx = -1;
        if ((band_tab[i+1] - band_tab[i]) == q->bandWidthT[i])
            indx = 0;

        if ((band_tab[i+1] - band_tab[i]) > q->bandWidthT[i])
            indx = 1;

        if (((band_tab[i+1] - band_tab[i])/2) >= q->bandWidthT[i])
            indx = 2;

        if (indx == -1)
            return -1;

        q->flcoeffs4[i] = q->flcoeffs4[i] + xTab[(indx*2 + (q->flcoeffs1[i] < highest)) * 2 + flag];
    }

    if (stream_format_code & 0x2) {
        q->flcoeffs4[0] = limit;
        q->flcoeffs4[1] = limit;
        q->flcoeffs4[2] = limit;
        q->flcoeffs4[3] = limit;
    }

    for(i = (stream_format_code & 0x2)?4:0; i < BANDS-1; i++) {
        iacc += q->bandWidthT[i];
        summa += q->bandWidthT[i] * q->flcoeffs4[i];
    }
    q->bandWidthT[BANDS-1] = 0;
    summa = (summa * 0.5 - freebits) / iacc;