sbr_fbt.c

tcpmp.src.0.72RC1 优秀的多媒体播放器TCPMP的源代码

        twoRegions = 0;
        k1 = k2;
    }

    nrBand0 = (uint8_t)(2 * find_bands(0, bands, k0, k1));
    nrBand0 = min(nrBand0, 63);
    if (nrBand0 <= 0)
        return 1;

    q = find_initial_power(nrBand0, k0, k1);
#ifdef FIXED_POINT
    qk = (real_t)k0 << REAL_BITS;
    //A_1 = (int32_t)((qk + REAL_CONST(0.5)) >> REAL_BITS);
    A_1 = k0;
#else
    qk = REAL_CONST(k0);
    A_1 = (int32_t)(qk + .5);
#endif
    for (k = 0; k <= nrBand0; k++)
    {
        int32_t A_0 = A_1;
#ifdef FIXED_POINT
        qk = MUL_R(qk,q);
        A_1 = (int32_t)((qk + REAL_CONST(0.5)) >> REAL_BITS);
#else
        qk *= q;
        A_1 = (int32_t)(qk + 0.5);
#endif
        vDk0[k] = A_1 - A_0;
    }

    /* needed? */
    qsort(vDk0, nrBand0, sizeof(vDk0[0]), longcmp);

    vk0[0] = k0;
    for (k = 1; k <= nrBand0; k++)
    {
        vk0[k] = vk0[k-1] + vDk0[k-1];
        if (vDk0[k-1] == 0)
            return 1;
    }

    if (!twoRegions)
    {
        for (k = 0; k <= nrBand0; k++)
            sbr->f_master[k] = (uint8_t) vk0[k];

        sbr->N_master = nrBand0;
        sbr->N_master = min(sbr->N_master, 64);
        return 0;
    }

    nrBand1 = (uint8_t)(2 * find_bands(1 /* warped */, bands, k1, k2));
    nrBand1 = min(nrBand1, 63);

    q = find_initial_power(nrBand1, k1, k2);
#ifdef FIXED_POINT
    qk = (real_t)k1 << REAL_BITS;
    //A_1 = (int32_t)((qk + REAL_CONST(0.5)) >> REAL_BITS);
    A_1 = k1;
#else
    qk = REAL_CONST(k1);
    A_1 = (int32_t)(qk + .5);
#endif
    for (k = 0; k <= nrBand1 - 1; k++)
    {
        int32_t A_0 = A_1;
#ifdef FIXED_POINT
        qk = MUL_R(qk,q);
        A_1 = (int32_t)((qk + REAL_CONST(0.5)) >> REAL_BITS);
#else
        qk *= q;
        A_1 = (int32_t)(qk + 0.5);
#endif
        vDk1[k] = A_1 - A_0;
    }

    if (vDk1[0] < vDk0[nrBand0 - 1])
    {
        int32_t change;

        /* needed? */
        qsort(vDk1, nrBand1 + 1, sizeof(vDk1[0]), longcmp);
        change = vDk0[nrBand0 - 1] - vDk1[0];
        vDk1[0] = vDk0[nrBand0 - 1];
        vDk1[nrBand1 - 1] = vDk1[nrBand1 - 1] - change;
    }

    /* needed? */
    qsort(vDk1, nrBand1, sizeof(vDk1[0]), longcmp);
    vk1[0] = k1;
    for (k = 1; k <= nrBand1; k++)
    {
        vk1[k] = vk1[k-1] + vDk1[k-1];
        if (vDk1[k-1] == 0)
            return 1;
    }

    sbr->N_master = nrBand0 + nrBand1;
    sbr->N_master = min(sbr->N_master, 64);
    for (k = 0; k <= nrBand0; k++)
    {
        sbr->f_master[k] =  (uint8_t) vk0[k];
    }
    for (k = nrBand0 + 1; k <= sbr->N_master; k++)
    {
        sbr->f_master[k] = (uint8_t) vk1[k - nrBand0];
    }

#if 0
    printf("f_master[%d]: ", sbr->N_master);
    for (k = 0; k <= sbr->N_master; k++)
    {
        printf("%d ", sbr->f_master[k]);
    }
    printf("\n");
#endif

    return 0;
}

/* calculate the derived frequency border tables from f_master */
uint8_t derived_frequency_table(sbr_info *sbr, uint8_t bs_xover_band,
                                uint8_t k2)
{
    uint8_t k, i;
    uint32_t minus;

    /* The following relation shall be satisfied: bs_xover_band < N_Master */
    if (sbr->N_master <= bs_xover_band)
        return 1;

    sbr->N_high = sbr->N_master - bs_xover_band;
    sbr->N_low = (sbr->N_high>>1) + (sbr->N_high - ((sbr->N_high>>1)<<1));

    sbr->n[0] = sbr->N_low;
    sbr->n[1] = sbr->N_high;

    for (k = 0; k <= sbr->N_high; k++)
    {
        sbr->f_table_res[HI_RES][k] = sbr->f_master[k + bs_xover_band];
    }

    sbr->M = sbr->f_table_res[HI_RES][sbr->N_high] - sbr->f_table_res[HI_RES][0];
    sbr->kx = sbr->f_table_res[HI_RES][0];
    if (sbr->kx > 32)
        return 1;
    if (sbr->kx + sbr->M > 64)
        return 1;

    minus = (sbr->N_high & 1) ? 1 : 0;

    for (k = 0; k <= sbr->N_low; k++)
    {
        if (k == 0)
            i = 0;
        else
            i = (uint8_t)(2*k - minus);
        sbr->f_table_res[LO_RES][k] = sbr->f_table_res[HI_RES][i];
    }

#if 0
    printf("bs_freq_scale: %d\n", sbr->bs_freq_scale);
    printf("bs_limiter_bands: %d\n", sbr->bs_limiter_bands);
    printf("f_table_res[HI_RES][%d]: ", sbr->N_high);
    for (k = 0; k <= sbr->N_high; k++)
    {
        printf("%d ", sbr->f_table_res[HI_RES][k]);
    }
    printf("\n");
#endif
#if 0
    printf("f_table_res[LO_RES][%d]: ", sbr->N_low);
    for (k = 0; k <= sbr->N_low; k++)
    {
        printf("%d ", sbr->f_table_res[LO_RES][k]);
    }
    printf("\n");
#endif

    sbr->N_Q = 0;
    if (sbr->bs_noise_bands == 0)
    {
        sbr->N_Q = 1;
    } else {
#if 0
        sbr->N_Q = max(1, (int32_t)(sbr->bs_noise_bands*(log(k2/(float)sbr->kx)/log(2.0)) + 0.5));
#else
        sbr->N_Q = (uint8_t)(max(1, find_bands(0, sbr->bs_noise_bands, sbr->kx, k2)));
#endif
        sbr->N_Q = min(5, sbr->N_Q);
    }

    for (k = 0; k <= sbr->N_Q; k++)
    {
        if (k == 0)
        {
            i = 0;
        } else {
            /* i = i + (int32_t)((sbr->N_low - i)/(sbr->N_Q + 1 - k)); */
            i = i + (sbr->N_low - i)/(sbr->N_Q + 1 - k);
        }
        sbr->f_table_noise[k] = sbr->f_table_res[LO_RES][i];
    }

    /* build table for mapping k to g in hf patching */
    for (k = 0; k < 64; k++)
    {
        uint8_t g;
        for (g = 0; g < sbr->N_Q; g++)
        {
            if ((sbr->f_table_noise[g] <= k) &&
                (k < sbr->f_table_noise[g+1]))
            {
                sbr->table_map_k_to_g[k] = g;
                break;
            }
        }
    }

#if 0
    printf("f_table_noise[%d]: ", sbr->N_Q);
    for (k = 0; k <= sbr->N_Q; k++)
    {
        printf("%d ", sbr->f_table_noise[k] - sbr->kx);
    }
    printf("\n");
#endif

    return 0;
}

/* TODO: blegh, ugly */
/* Modified to calculate for all possible bs_limiter_bands always
 * This reduces the number calls to this functions needed (now only on
 * header reset)
 */
void limiter_frequency_table(sbr_info *sbr)
{
#if 0
    static const real_t limiterBandsPerOctave[] = { REAL_CONST(1.2),
        REAL_CONST(2), REAL_CONST(3) };
#else
    static const real_t limiterBandsCompare[] = { REAL_CONST(1.327152),
        REAL_CONST(1.185093), REAL_CONST(1.119872) };
#endif
    uint8_t k, s;
    int8_t nrLim;
#if 0
    real_t limBands;
#endif

    sbr->f_table_lim[0][0] = sbr->f_table_res[LO_RES][0] - sbr->kx;
    sbr->f_table_lim[0][1] = sbr->f_table_res[LO_RES][sbr->N_low] - sbr->kx;
    sbr->N_L[0] = 1;

#if 0
    printf("f_table_lim[%d][%d]: ", 0, sbr->N_L[0]);
    for (k = 0; k <= sbr->N_L[0]; k++)
    {
        printf("%d ", sbr->f_table_lim[0][k]);
    }
    printf("\n");
#endif

    for (s = 1; s < 4; s++)
    {
        int32_t limTable[100 /*TODO*/] = {0};
        uint8_t patchBorders[64/*??*/] = {0};

#if 0
        limBands = limiterBandsPerOctave[s - 1];
#endif

        patchBorders[0] = sbr->kx;
        for (k = 1; k <= sbr->noPatches; k++)
        {
            patchBorders[k] = patchBorders[k-1] + sbr->patchNoSubbands[k-1];
        }

        for (k = 0; k <= sbr->N_low; k++)
        {
            limTable[k] = sbr->f_table_res[LO_RES][k];
        }
        for (k = 1; k < sbr->noPatches; k++)
        {
            limTable[k+sbr->N_low] = patchBorders[k];
        }

        /* needed */
        qsort(limTable, sbr->noPatches + sbr->N_low, sizeof(limTable[0]), longcmp);
        k = 1;
        nrLim = sbr->noPatches + sbr->N_low - 1;

        if (nrLim < 0) // TODO: BIG FAT PROBLEM
            return;

restart:
        if (k <= nrLim)
        {
            real_t nOctaves;

            if (limTable[k-1] != 0)
#if 0
                nOctaves = REAL_CONST(log((float)limTable[k]/(float)limTable[k-1])/log(2.0));
#else
#ifdef FIXED_POINT
                nOctaves = DIV_R((limTable[k]<<REAL_BITS),REAL_CONST(limTable[k-1]));
#else
                nOctaves = (real_t)limTable[k]/(real_t)limTable[k-1];
#endif
#endif
            else
                nOctaves = 0;

#if 0
            if ((MUL_R(nOctaves,limBands)) < REAL_CONST(0.49))
#else
            if (nOctaves < limiterBandsCompare[s - 1])
#endif
            {
                uint8_t i;
                if (limTable[k] != limTable[k-1])
                {
                    uint8_t found = 0, found2 = 0;
                    for (i = 0; i <= sbr->noPatches; i++)
                    {
                        if (limTable[k] == patchBorders[i])
                            found = 1;
                    }
                    if (found)
                    {
                        found2 = 0;
                        for (i = 0; i <= sbr->noPatches; i++)
                        {
                            if (limTable[k-1] == patchBorders[i])
                                found2 = 1;
                        }
                        if (found2)
                        {
                            k++;
                            goto restart;
                        } else {
                            /* remove (k-1)th element */
                            limTable[k-1] = sbr->f_table_res[LO_RES][sbr->N_low];
                            qsort(limTable, sbr->noPatches + sbr->N_low, sizeof(limTable[0]), longcmp);
                            nrLim--;
                            goto restart;
                        }
                    }
                }
                /* remove kth element */
                limTable[k] = sbr->f_table_res[LO_RES][sbr->N_low];
                qsort(limTable, nrLim, sizeof(limTable[0]), longcmp);
                nrLim--;
                goto restart;
            } else {
                k++;
                goto restart;
            }
        }

        sbr->N_L[s] = nrLim;
        for (k = 0; k <= nrLim; k++)
        {
            sbr->f_table_lim[s][k] = limTable[k] - sbr->kx;
        }

#if 0
        printf("f_table_lim[%d][%d]: ", s, sbr->N_L[s]);
        for (k = 0; k <= sbr->N_L[s]; k++)
        {
            printf("%d ", sbr->f_table_lim[s][k]);
        }
        printf("\n");
#endif
    }
}

#endif