Commit d53baff4 authored by TYAGIRIS's avatar TYAGIRIS
Browse files

Merge branch 'dlb_sba_noW_vanishing_residuals_fix' into 'main' 

Fix for vanishing residuals in SBA mode when W channel in the input is silence

See merge request !884
parents e4762298 ad8b0672

lib_com/ivas_cnst.h

+5 −0
Original line number Diff line number Diff line
@@ -1063,6 +1063,11 @@ typedef enum 
#define IVAS_ACTIVEW_DM_F_SCALE_VLBR            0.25f

#define IVAS_SPAR_FOA_DFLT_FREQ_PER_CHAN        24000



#ifdef FIX_SBA_VANISHING_RESIDUAL

#define IVAS_SPAR_DYN_ACTIVEW_THRESH           (0.0039f)

#define IVAS_SPAR_SIDE_CH_DYN_ACTIVEW_THRESH   (32.0f)

#endif



#define MAX_QUANT_STRATS                        3

#define MAX_CODING_STRATS                       3

#define IVAS_NUM_PROB_MODELS                    4

lib_com/ivas_fb_mixer.c

+38 −9
Original line number Diff line number Diff line
@@ -590,14 +590,22 @@ void ivas_fb_mixer_get_windowed_fr( 
 *

 * FB Mixer cross fading

 *-----------------------------------------------------------------------------------------*/



static void ivas_fb_mixer_cross_fading(

#ifndef FIX_SBA_VANISHING_RESIDUAL

static

#endif

    void

    ivas_fb_mixer_cross_fading(

        IVAS_FB_MIXER_HANDLE hFbMixer,

        float **ppOut_pcm,

        float *pMdft_out_old,

        float *pMdft_out_new,

        const int16_t ch,

    const int16_t frame_len )

        const int16_t frame_len

#ifdef FIX_SBA_VANISHING_RESIDUAL

        ,

        const int16_t cf_offset

#endif

    )

{

    int16_t k, fade_start_offset, fade_end_offset;
@@ -608,17 +616,29 @@ static void ivas_fb_mixer_cross_fading( 


        for ( k = 0; k < fade_start_offset; k++ )

        {

#ifdef FIX_SBA_VANISHING_RESIDUAL

            ppOut_pcm[ch][k] = pMdft_out_old[k + cf_offset];

#else

            ppOut_pcm[ch][k] = pMdft_out_old[k + frame_len];

#endif

        }



        for ( k = fade_start_offset; k < fade_end_offset; k++ )

        {

#ifdef FIX_SBA_VANISHING_RESIDUAL

            ppOut_pcm[ch][k] = pMdft_out_new[k + cf_offset] * hFbMixer->pFilterbank_cross_fade[k - fade_start_offset] + pMdft_out_old[k + cf_offset] * ( 1.0f - hFbMixer->pFilterbank_cross_fade[k - fade_start_offset] );

#else

            ppOut_pcm[ch][k] = pMdft_out_new[k + frame_len] * hFbMixer->pFilterbank_cross_fade[k - fade_start_offset] + pMdft_out_old[k + frame_len] * ( 1.0f - hFbMixer->pFilterbank_cross_fade[k - fade_start_offset] );

#endif

        }



        for ( k = fade_end_offset; k < frame_len; k++ )

        {

#ifdef FIX_SBA_VANISHING_RESIDUAL

            ppOut_pcm[ch][k] = pMdft_out_new[k + cf_offset];

#else

            ppOut_pcm[ch][k] = pMdft_out_new[k + frame_len];

#endif

        }

    }

    else
@@ -627,7 +647,11 @@ static void ivas_fb_mixer_cross_fading( 


        for ( k = 0; k < frame_len; k++ )

        {

#ifdef FIX_SBA_VANISHING_RESIDUAL

            ppOut_pcm[ch][k] = pMdft_out_new[k + cf_offset];

#else

            ppOut_pcm[ch][k] = pMdft_out_new[k + frame_len];

#endif

        }

    }
@@ -717,7 +741,12 @@ void ivas_fb_mixer_process( 
            ivas_imdft( pOut_fr_re, pOut_fr_im, pMdft_out[hist], frame_len );

        }



        ivas_fb_mixer_cross_fading( hFbMixer, ppOut_pcm, pMdft_out[0], pMdft_out[1], ch, frame_len );

        ivas_fb_mixer_cross_fading( hFbMixer, ppOut_pcm, pMdft_out[0], pMdft_out[1], ch, frame_len

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                    ,

                                    frame_len

#endif

        );

    }



    return;

lib_com/ivas_prot.h

+55 −2
Original line number Diff line number Diff line
@@ -114,6 +114,18 @@ ivas_error ivas_spar_md_enc_init 
    const int16_t sba_order                                   /* i  : Ambisonic (SBA) order    */

);



#ifdef FIX_SBA_VANISHING_RESIDUAL

int16_t ivas_spar_get_activeW_flag(

    ivas_enc_cov_handler_state_t *hCovEnc,

    float *cov_real[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH],

    float *cov_dtx_real[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH],

    const int16_t dtx_vad,

    const int16_t nchan_inp,

	const int16_t nchan_transport,

	int16_t *res_ind,

	const int16_t *dmx_order);

#endif



ivas_error ivas_sba_enc_reconfigure(

    Encoder_Struct *st_ivas                                     /* i/o: IVAS encoder structure                  */

);
@@ -4390,8 +4402,13 @@ ivas_error ivas_spar_md_enc_process( 
    const int16_t nchan_inp,

    const int16_t sba_order,                                    /* i  : Ambisonic (SBA) order                   */

    float *prior_mixer[IVAS_MAX_FB_MIXER_OUT_CH][IVAS_MAX_SPAR_FB_MIXER_IN_CH]                                  /* i  : prior mixer_matrix     */

#ifdef FIX_SBA_VANISHING_RESIDUAL

     ,

     const int16_t dyn_active_w_flag            /* i : flag to indicate dynamic active W*/

#endif

#ifdef FIX_527_SBA_MONO_INPUT

    ,const int16_t dirac_mono_flag

    ,

	const int16_t dirac_mono_flag             /* i : flag to indicate mono only mode in SBA*/

#endif

);
@@ -4411,6 +4428,10 @@ void ivas_compute_spar_params( 
    ivas_spar_md_t *hSparMd,

    float *pWscale,

    const int16_t from_dirac 

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

);



void ivas_create_fullr_dmx_mat(
@@ -4438,6 +4459,10 @@ void ivas_calc_c_p_coeffs( 
    ,

    const int16_t planarCP 

#endif

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

);



void ivas_get_spar_md_from_dirac(
@@ -4456,6 +4481,10 @@ void ivas_get_spar_md_from_dirac( 
	,

    const uint8_t useLowerRes,

    const int16_t active_w_vlbr

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t  dyn_active_w_flag

#endif

);



/*! r: number of MD subframes */
@@ -4526,6 +4555,10 @@ void ivas_spar_to_dirac( 
    const int16_t dtx_vad,                                      /* i  : DTX frame flag                          */

    const int16_t num_bands_out,                                /* i  : number of output bands                  */

    const int16_t bw					                        /* i  : band joining factor                     */

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag                            /* i  : dynamic active W flag                     */

#endif

);



void ivas_spar_update_md_hist(
@@ -4585,6 +4618,14 @@ void ivas_enc_cov_handler_process( 
    const int16_t dtx_vad,

    const int16_t transient_det[2],

    const int16_t HOA_md_ind[IVAS_SPAR_MAX_CH]

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    int16_t *res_ind,

    const int16_t *remix_order,

    int16_t *dyn_active_w_flag,

	const int16_t nchan_transport,

	const int16_t is_sba

#endif

);



ivas_error ivas_spar_covar_smooth_enc_open(
@@ -5935,6 +5976,18 @@ void ivas_fb_mixer_get_in_out_mapping( 
    int16_t in_out_mixer_map[IVAS_MAX_FB_MIXER_OUT_CH][IVAS_MAX_SPAR_FB_MIXER_IN_CH]   /* i/o: mixing mapping       */

);



#ifdef FIX_SBA_VANISHING_RESIDUAL

void ivas_fb_mixer_cross_fading(

        IVAS_FB_MIXER_HANDLE hFbMixer,

        float **ppOut_pcm,

        float *pMdft_out_old,

        float *pMdft_out_new,

        const int16_t ch,

        const int16_t frame_len,

        const int16_t cf_offset

    );

#endif



/*! r: number of spectral bands */

int16_t ivas_get_num_bands_from_bw_idx( 

    const int16_t bwidth                                        /* i  : audio bandwidth                             */

lib_com/ivas_spar_com.c

+142 −27
Original line number Diff line number Diff line
@@ -77,11 +77,22 @@ 
 *------------------------------------------------------------------------------------------*/





static void ivas_get_pred_coeffs( float *pppCov_mat_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], float ppPred_coeffs_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], float ppDM_Fv_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], const int16_t in_chans, const int16_t start_band, const int16_t end_band, const int16_t active_w, const int16_t active_w_vlbr, const int16_t dtx_vad, const int16_t from_dirac );

static void ivas_get_pred_coeffs( float *pppCov_mat_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], float ppPred_coeffs_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], float ppDM_Fv_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], const int16_t in_chans, const int16_t start_band, const int16_t end_band, const int16_t active_w, const int16_t active_w_vlbr, const int16_t dtx_vad, const int16_t from_dirac

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                  ,

                                  const int16_t dyn_active_w_flag,

                                  const int16_t res_ind

#endif

);



static void ivas_reorder_array( float in_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH][IVAS_MAX_NUM_BANDS], const int16_t in_chans, const int16_t order[IVAS_SPAR_MAX_CH], float ***mixer_mat, const int16_t start_band, const int16_t end_band );



static void ivas_get_Wscaling_factor( float *pppCov_mat_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], float pred_coeffs_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], float ***mixer_mat, const int16_t start_band, const int16_t end_band, const int16_t dtx_vad, const int16_t num_ch, const int16_t *pNum_dmx, const int16_t bands_bw, const int16_t active_w, const int16_t active_w_vlbr, float *pWscale );

static void ivas_get_Wscaling_factor( float *pppCov_mat_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], float pred_coeffs_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS], float ***mixer_mat, const int16_t start_band, const int16_t end_band, const int16_t dtx_vad, const int16_t num_ch, const int16_t *pNum_dmx, const int16_t bands_bw, const int16_t active_w, const int16_t active_w_vlbr, float *pWscale

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                      ,

                                      const int16_t dyn_active_w_flag

#endif

);



static void ivas_calc_post_pred_per_band( float *pppCov_mat_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], float ***mixer_mat, const int16_t num_ch, const int16_t num_dmx, const int16_t band_idx, float postpred_cov_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH] );
@@ -462,7 +473,13 @@ static void ivas_get_pred_coeffs( 
    const int16_t active_w,

    const int16_t active_w_vlbr,

    const int16_t dtx_vad,

    const int16_t from_dirac )

    const int16_t from_dirac

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag,

    const int16_t res_ind

#endif

)

{

    int16_t i, j, k, b;

    float abs_value;
@@ -517,7 +534,21 @@ static void ivas_get_pred_coeffs( 
        float real[IVAS_SPAR_MAX_CH - 1], dm_beta_re = 0, dm_g[IVAS_MAX_NUM_BANDS];

        float dm_f_local, dm_w, dm_y, DM_F[IVAS_MAX_NUM_BANDS];

        float num_f, den_f, passive_g;

#ifdef FIX_SBA_VANISHING_RESIDUAL

        float activew_quad_thresh, g_th_sq;

        if ( dyn_active_w_flag == 1 )

        {

            activew_quad_thresh = 1.0f;

        }

        else

        {

            activew_quad_thresh = IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH;

        }

        g_th_sq = activew_quad_thresh * activew_quad_thresh;

#else

        float g_th_sq = IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH * IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH;

#endif





        set_zero( dm_alpha, IVAS_MAX_NUM_BANDS );
@@ -580,7 +611,26 @@ static void ivas_get_pred_coeffs( 
            den_f = max( dm_w, 1e-20f );

            passive_g = dm_alpha[b] / den_f;



#ifdef FIX_SBA_VANISHING_RESIDUAL

            if ( dyn_active_w_flag == 1 )

            {

                dm_alpha[b] = 0.0f;

                dm_w = 0.0f;

                for ( i = 0; i < pred_dim; i++ )

                {

                    dm_v_re[i][b] = 0.0f;

                }

                dm_v_re[res_ind - 1][b] = 1.0f;

                passive_g = activew_quad_thresh;

            }

#endif





#ifdef FIX_SBA_VANISHING_RESIDUAL

            if ( passive_g < activew_quad_thresh )

#else

            if ( passive_g < IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH )

#endif

            {

                /*linear activeW*/

                dm_y = 0;
@@ -604,7 +654,13 @@ static void ivas_get_pred_coeffs( 
                float sqrt_val;



                /* quadratic activeW */



#ifdef FIX_SBA_VANISHING_RESIDUAL

                num_f = ( dm_beta_re - ( 2 * dm_alpha[b] * activew_quad_thresh ) );

#else

                num_f = ( dm_beta_re - ( 2 * dm_alpha[b] * IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH ) );

#endif



                sqrt_val = 4 * dm_alpha[b] * dm_alpha[b] * g_th_sq;

                sqrt_val += dm_beta_re * dm_beta_re;

                sqrt_val -= 4 * dm_beta_re * g_th_sq * dm_w;
@@ -613,7 +669,11 @@ static void ivas_get_pred_coeffs( 


                den_f = 2 * dm_beta_re * g_th_sq;

                den_f = max( den_f, 1e-20f );

#ifdef FIX_SBA_VANISHING_RESIDUAL

                dm_g[b] = activew_quad_thresh;

#else

                dm_g[b] = IVAS_LIN_ACTIVEW_QUAD_ACTIVEW_THRESH;

#endif

                DM_F[b] = ( dm_g[b] * num_f ) / den_f;

            }

        }
@@ -651,7 +711,12 @@ static void ivas_get_Wscaling_factor( 
    const int16_t bands_bw,

    const int16_t active_w,

    const int16_t active_w_vlbr,

    float *pWscale )

    float *pWscale

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

)

{

    int16_t b, ch;

    float dm_f_local, abs_val;
@@ -670,7 +735,11 @@ static void ivas_get_Wscaling_factor( 
    {

        pWscale[b] = 1;



#ifdef FIX_SBA_VANISHING_RESIDUAL

        if ( ( active_w == 1 ) && ( dyn_active_w_flag == 0 ) )

#else

        if ( ( active_w == 1 ) && ( pNum_dmx[b * bands_bw] == 1 ) )

#endif

        {

            float Gw_sq, g_sq = 0;
@@ -1260,9 +1329,13 @@ void ivas_calc_c_p_coeffs( 
    ,

    const int16_t planarCP

#endif

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

)

{

#ifndef FIX_280_PLANAR_CP

#ifdef FIX_SBA_VANISHING_RESIDUAL

    int16_t i, j;

#endif

    float postpred_cov_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH];
@@ -1276,12 +1349,10 @@ void ivas_calc_c_p_coeffs( 
            ivas_calc_c_coeffs_per_band( pSparMd, i_ts, postpred_cov_re, num_ch, num_dmx, band_idx, dtx_vad );

        }



#ifndef FIX_280_PLANAR_CP

        if ( planarCP )

#ifdef FIX_SBA_VANISHING_RESIDUAL

        if ( dyn_active_w_flag )

        {

            for ( i = 0; i < num_ch - num_dmx; i++ )

            {

                if ( !keep_planar[i] )

            {

                for ( j = 0; j < num_dmx - 1; j++ )

                {
@@ -1289,25 +1360,20 @@ void ivas_calc_c_p_coeffs( 
                }

            }

        }

        }

#endif



        if ( compute_p_flag == 1 )

        {

            ivas_calc_p_coeffs_per_band( pSparMd, i_ts, postpred_cov_re, num_ch, dtx_vad, num_dmx, band_idx );

        }



#ifndef FIX_280_PLANAR_CP

        if ( planarCP )

#ifdef FIX_SBA_VANISHING_RESIDUAL

        if ( dyn_active_w_flag )

        {

            for ( i = num_dmx; i < num_ch; i++ )

            {

                if ( !keep_planar[i - num_dmx] )

            {

                pSparMd->band_coeffs[band_idx + i_ts * IVAS_MAX_NUM_BANDS].P_re[i - num_dmx] = 0;

            }

        }

        }

#endif

    }
@@ -1560,14 +1626,25 @@ void ivas_compute_spar_params( 
    ivas_spar_md_com_cfg *hSparCfg,

    ivas_spar_md_t *hSparMd,

    float *pWscale,

    const int16_t from_dirac )

    const int16_t from_dirac

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

)

{

    float pred_coeffs_re[IVAS_SPAR_MAX_CH - 1][IVAS_MAX_NUM_BANDS];

    int16_t b, i, ndm;



    ivas_get_pred_coeffs( cov_real, pred_coeffs_re, dm_fv_re, num_ch, start_band, end_band, active_w,

                          active_w_vlbr,

                          dtx_vad, from_dirac );

                          dtx_vad, from_dirac

#ifdef FIX_SBA_VANISHING_RESIDUAL

                          ,

                          dyn_active_w_flag,

                          hSparMd->res_ind

#endif

    );



#ifdef SPAR_HOA_DBG

    /*fprintf(stderr, "\n\n Prediction Coefficients:\n");
@@ -1601,7 +1678,12 @@ void ivas_compute_spar_params( 
    ivas_get_Wscaling_factor( cov_real, pred_coeffs_re, mixer_mat, start_band, end_band, dtx_vad, num_ch,

                              hSparCfg->num_dmx_chans_per_band, bands_bw, active_w,

                              active_w_vlbr,

                              pWscale );

                              pWscale

#ifdef FIX_SBA_VANISHING_RESIDUAL

                              ,

                              dyn_active_w_flag

#endif

    );



    for ( b = start_band; b < end_band; b++ )

    {
@@ -1624,9 +1706,19 @@ void ivas_compute_spar_params( 
        if ( ndm != num_ch )

        {

#ifndef FIX_280_PLANAR_CP

            ivas_calc_c_p_coeffs( hSparMd, cov_real, i_ts, mixer_mat, num_ch, ndm, b, dtx_vad, 1, 0 );

            ivas_calc_c_p_coeffs( hSparMd, cov_real, i_ts, mixer_mat, num_ch, ndm, b, dtx_vad, 1, 0

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                  ,

                                  dyn_active_w_flag

#endif

            );

#else

            ivas_calc_c_p_coeffs( hSparMd, cov_real, i_ts, mixer_mat, num_ch, ndm, b, dtx_vad, 1 );

            ivas_calc_c_p_coeffs( hSparMd, cov_real, i_ts, mixer_mat, num_ch, ndm, b, dtx_vad, 1

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                  ,

                                  dyn_active_w_flag

#endif

            );

#endif



#ifdef SPAR_HOA_DBG
@@ -1677,7 +1769,12 @@ void ivas_get_spar_md_from_dirac( 
    const int16_t dtx_vad,

    float Wscale_d[IVAS_MAX_NUM_BANDS],

    const uint8_t useLowerRes,

    const int16_t active_w_vlbr )

    const int16_t active_w_vlbr

#ifdef FIX_SBA_VANISHING_RESIDUAL

    ,

    const int16_t dyn_active_w_flag

#endif

)

{

    int16_t num_ch, band, i, j;

    int16_t block, ch;
@@ -1691,6 +1788,10 @@ void ivas_get_spar_md_from_dirac( 
    float **ppMixer_mat[IVAS_MAX_FB_MIXER_OUT_CH];

    float *pMixer_mat[IVAS_MAX_FB_MIXER_OUT_CH][IVAS_MAX_SPAR_FB_MIXER_IN_CH];

    float en_ratio_fac, diff_norm_order1, diff_norm_order2, diff_norm_order3;

#ifdef FIX_SBA_VANISHING_RESIDUAL

    int16_t active_w;

#endif



    int16_t ndm, foa_ch, hoa2_ch;

    float P_dir_fact[IVAS_SPAR_MAX_CH - 1];

    const int16_t *remix_order;
@@ -1852,7 +1953,6 @@ void ivas_get_spar_md_from_dirac( 


            en_ratio_fac = ( 1.0f - diffuseness[band] );





            for ( i = 0; i < num_ch; i++ )

            {

                for ( j = 0; j < num_ch; j++ )
@@ -1948,8 +2048,23 @@ void ivas_get_spar_md_from_dirac( 
        }

#endif



#ifdef FIX_SBA_VANISHING_RESIDUAL

        active_w = ( dyn_active_w_flag == 1 ) || ( hSpar_md_cfg->active_w == 1 );

#endif

        ivas_compute_spar_params( pCov_real, dm_fv_re, i_ts, ppMixer_mat, start_band, end_band, dtx_vad,

                                  num_ch, 1, hSpar_md_cfg->active_w, active_w_vlbr, hSpar_md_cfg, hSpar_md, Wscale, 1 );

                                  num_ch, 1,

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                  active_w,

#else

                                  hSpar_md_cfg->active_w,

#endif

                                  active_w_vlbr,

                                  hSpar_md_cfg, hSpar_md, Wscale, 1

#ifdef FIX_SBA_VANISHING_RESIDUAL

                                  ,

                                  dyn_active_w_flag

#endif

        );



        if ( mixer_mat != NULL )

        {

lib_com/ivas_stat_com.h

+4 −0
Original line number Diff line number Diff line
@@ -229,6 +229,10 @@ typedef struct ivas_spar_md_t 
    int16_t dtx_vad;

    float en_ratio_slow[IVAS_MAX_NUM_BANDS];

    float ref_pow_slow[IVAS_MAX_NUM_BANDS];

#ifdef FIX_SBA_VANISHING_RESIDUAL

    int16_t res_ind;

    int16_t prior_dyn_active_w_flag;

#endif

} ivas_spar_md_t;



typedef struct ivas_spar_md_prev_t