sbr_dec.c

the mpeg2/4 aac decoder

                QMF_IM(X[l][k]) = QMF_IM(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
#endif
            }
            for (k = 32; k < 64; k++)
            {
                QMF_RE(X[l][k]) = 0;
#ifndef SBR_LOW_POWER
                QMF_IM(X[l][k]) = 0;
#endif
            }
        }
    } else {
        for (l = 0; l < sbr->numTimeSlotsRate; l++)
        {
            uint8_t kx_band, M_band, bsco_band;

            if (l < sbr->t_E[ch][0])
            {
                kx_band = sbr->kx_prev;
                M_band = sbr->M_prev;
                bsco_band = sbr->bsco_prev;
            } else {
                kx_band = sbr->kx;
                M_band = sbr->M;
                bsco_band = sbr->bsco;
            }

#ifndef SBR_LOW_POWER
            for (k = 0; k < kx_band + bsco_band; k++)
            {
                QMF_RE(X[l][k]) = QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
                QMF_IM(X[l][k]) = QMF_IM(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
            }
            for (k = kx_band + bsco_band; k < kx_band + M_band; k++)
            {
                QMF_RE(X[l][k]) = QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
                QMF_IM(X[l][k]) = QMF_IM(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
            }
            for (k = max(kx_band + bsco_band, kx_band + M_band); k < 64; k++)
            {
                QMF_RE(X[l][k]) = 0;
                QMF_IM(X[l][k]) = 0;
            }
#else
            for (k = 0; k < kx_band + bsco_band; k++)
            {
                QMF_RE(X[l][k]) = QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
            }
            for (k = kx_band + bsco_band; k < min(kx_band + M_band, 63); k++)
            {
                QMF_RE(X[l][k]) = QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
            }
            for (k = max(kx_band + bsco_band, kx_band + M_band); k < 64; k++)
            {
                QMF_RE(X[l][k]) = 0;
            }
            QMF_RE(X[l][kx_band - 1 + bsco_band]) +=
                QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][kx_band - 1 + bsco_band]);
#endif
        }
    }
}

uint8_t sbrDecodeCoupleFrame(sbr_info *sbr, real_t *left_chan, real_t *right_chan,
                             const uint8_t just_seeked, const uint8_t downSampledSBR)
{
    uint8_t dont_process = 0;
    uint8_t ret = 0;
    ALIGN qmf_t X[MAX_NTSR][64];

    if (sbr == NULL)
        return 20;

    /* case can occur due to bit errors */
    if (sbr->id_aac != ID_CPE)
        return 21;

    if (sbr->ret || (sbr->header_count == 0))
    {
        /* don't process just upsample */
        dont_process = 1;

        /* Re-activate reset for next frame */
        if (sbr->ret && sbr->Reset)
            sbr->bs_start_freq_prev = -1;
    }

    if (just_seeked)
    {
        sbr->just_seeked = 1;
    } else {
        sbr->just_seeked = 0;
    }

    sbr_process_channel(sbr, left_chan, X, 0, dont_process, downSampledSBR);
    /* subband synthesis */
    if (downSampledSBR)
    {
        sbr_qmf_synthesis_32(sbr, sbr->qmfs[0], X, left_chan);
    } else {
        sbr_qmf_synthesis_64(sbr, sbr->qmfs[0], X, left_chan);
    }

    sbr_process_channel(sbr, right_chan, X, 1, dont_process, downSampledSBR);
    /* subband synthesis */
    if (downSampledSBR)
    {
        sbr_qmf_synthesis_32(sbr, sbr->qmfs[1], X, right_chan);
    } else {
        sbr_qmf_synthesis_64(sbr, sbr->qmfs[1], X, right_chan);
    }

    if (sbr->bs_header_flag)
        sbr->just_seeked = 0;

    if (sbr->header_count != 0 && sbr->ret == 0)
    {
        ret = sbr_save_prev_data(sbr, 0);
        if (ret) return ret;
        ret = sbr_save_prev_data(sbr, 1);
        if (ret) return ret;
    }

    sbr_save_matrix(sbr, 0);
    sbr_save_matrix(sbr, 1);

    sbr->frame++;

//#define POST_QMF_PRINT
#ifdef POST_QMF_PRINT
    {
        int i;
        for (i = 0; i < 2048; i++)
        {
            printf("%d\n", left_chan[i]);
        }
        for (i = 0; i < 2048; i++)
        {
            printf("%d\n", right_chan[i]);
        }
    }
#endif

    return 0;
}

uint8_t sbrDecodeSingleFrame(sbr_info *sbr, real_t *channel,
                             const uint8_t just_seeked, const uint8_t downSampledSBR)
{
    uint8_t dont_process = 0;
    uint8_t ret = 0;
    ALIGN qmf_t X[MAX_NTSR][64];

    if (sbr == NULL)
        return 20;

    /* case can occur due to bit errors */
    if (sbr->id_aac != ID_SCE && sbr->id_aac != ID_LFE)
        return 21;

    if (sbr->ret || (sbr->header_count == 0))
    {
        /* don't process just upsample */
        dont_process = 1;

        /* Re-activate reset for next frame */
        if (sbr->ret && sbr->Reset)
            sbr->bs_start_freq_prev = -1;
    }

    if (just_seeked)
    {
        sbr->just_seeked = 1;
    } else {
        sbr->just_seeked = 0;
    }

    sbr_process_channel(sbr, channel, X, 0, dont_process, downSampledSBR);
    /* subband synthesis */
    if (downSampledSBR)
    {
        sbr_qmf_synthesis_32(sbr, sbr->qmfs[0], X, channel);
    } else {
        sbr_qmf_synthesis_64(sbr, sbr->qmfs[0], X, channel);
    }

    if (sbr->bs_header_flag)
        sbr->just_seeked = 0;

    if (sbr->header_count != 0 && sbr->ret == 0)
    {
        ret = sbr_save_prev_data(sbr, 0);
        if (ret) return ret;
    }

    sbr_save_matrix(sbr, 0);

    sbr->frame++;

//#define POST_QMF_PRINT
#ifdef POST_QMF_PRINT
    {
        int i;
        for (i = 0; i < 2048; i++)
        {
            printf("%d\n", channel[i]);
        }
    }
#endif

    return 0;
}

#if (defined(PS_DEC) || defined(DRM_PS))
uint8_t sbrDecodeSingleFramePS(sbr_info *sbr, real_t *left_channel, real_t *right_channel,
                               const uint8_t just_seeked, const uint8_t downSampledSBR)
{
    uint8_t l, k;
    uint8_t dont_process = 0;
    uint8_t ret = 0;
    ALIGN qmf_t X_left[38][64] = {{0}};
    ALIGN qmf_t X_right[38][64] = {{0}}; /* must set this to 0 */

    if (sbr == NULL)
        return 20;

    /* case can occur due to bit errors */
    if (sbr->id_aac != ID_SCE && sbr->id_aac != ID_LFE)
        return 21;

    if (sbr->ret || (sbr->header_count == 0))
    {
        /* don't process just upsample */
        dont_process = 1;

        /* Re-activate reset for next frame */
        if (sbr->ret && sbr->Reset)
            sbr->bs_start_freq_prev = -1;
    }

    if (just_seeked)
    {
        sbr->just_seeked = 1;
    } else {
        sbr->just_seeked = 0;
    }

    if (sbr->qmfs[1] == NULL)
    {
        sbr->qmfs[1] = qmfs_init((downSampledSBR)?32:64);
    }

    sbr_process_channel(sbr, left_channel, X_left, 0, dont_process, downSampledSBR);

    /* copy some extra data for PS */
    for (l = 32; l < 38; l++)
    {
        for (k = 0; k < 5; k++)
        {
            QMF_RE(X_left[l][k]) = QMF_RE(sbr->Xsbr[0][sbr->tHFAdj+l][k]);
            QMF_IM(X_left[l][k]) = QMF_IM(sbr->Xsbr[0][sbr->tHFAdj+l][k]);
        }
    }

    /* perform parametric stereo */
#ifdef DRM_PS
    if (sbr->Is_DRM_SBR)
    {
        drm_ps_decode(sbr->drm_ps, (sbr->ret > 0), sbr->sample_rate, X_left, X_right);
    } else {
#endif
#ifdef PS_DEC
        ps_decode(sbr->ps, X_left, X_right);
#endif
#ifdef DRM_PS
    }
#endif

    /* subband synthesis */
    if (downSampledSBR)
    {
        sbr_qmf_synthesis_32(sbr, sbr->qmfs[0], X_left, left_channel);
        sbr_qmf_synthesis_32(sbr, sbr->qmfs[1], X_right, right_channel);
    } else {
        sbr_qmf_synthesis_64(sbr, sbr->qmfs[0], X_left, left_channel);
        sbr_qmf_synthesis_64(sbr, sbr->qmfs[1], X_right, right_channel);
    }

    if (sbr->bs_header_flag)
        sbr->just_seeked = 0;

    if (sbr->header_count != 0 && sbr->ret == 0)
    {
        ret = sbr_save_prev_data(sbr, 0);
        if (ret) return ret;
    }

    sbr_save_matrix(sbr, 0);

    sbr->frame++;

    return 0;
}
#endif

#endif