int
sinc_set_converter (SRC_PRIVATE *psrc, int src_enum)
{ SINC_FILTER *filter, temp_filter ;
increment_t count ;
int bits ;
/* Quick sanity check. */
if (SHIFT_BITS >= sizeof (increment_t) * 8 - 1)
return SRC_ERR_SHIFT_BITS ;
if (psrc->private_data != NULL)
{ free (psrc->private_data) ;
psrc->private_data = NULL ;
} ;
memset (&temp_filter, 0, sizeof (temp_filter)) ;
temp_filter.sinc_magic_marker = SINC_MAGIC_MARKER ;
temp_filter.channels = psrc->channels ;
if (psrc->channels > ARRAY_LEN (temp_filter.left_calc))
return SRC_ERR_BAD_CHANNEL_COUNT ;
else if (psrc->channels == 1)
{ psrc->const_process = sinc_mono_vari_process ;
psrc->vari_process = sinc_mono_vari_process ;
}
else
if (psrc->channels == 2)
{ psrc->const_process = sinc_stereo_vari_process ;
psrc->vari_process = sinc_stereo_vari_process ;
}
else
if (psrc->channels == 4)
{ psrc->const_process = sinc_quad_vari_process ;
psrc->vari_process = sinc_quad_vari_process ;
}
else
if (psrc->channels == 6)
{ psrc->const_process = sinc_hex_vari_process ;
psrc->vari_process = sinc_hex_vari_process ;
}
else
{ psrc->const_process = sinc_multichan_vari_process ;
psrc->vari_process = sinc_multichan_vari_process ;
} ;
psrc->reset = sinc_reset ;
switch (src_enum)
{ case SRC_SINC_FASTEST :
temp_filter.coeffs = fastest_coeffs.coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (fastest_coeffs.coeffs) - 2 ;
temp_filter.index_inc = fastest_coeffs.increment ;
break ;
case SRC_SINC_MEDIUM_QUALITY :
temp_filter.coeffs = slow_mid_qual_coeffs.coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (slow_mid_qual_coeffs.coeffs) - 2 ;
temp_filter.index_inc = slow_mid_qual_coeffs.increment ;
break ;
case SRC_SINC_BEST_QUALITY :
temp_filter.coeffs = slow_high_qual_coeffs.coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (slow_high_qual_coeffs.coeffs) - 2 ;
temp_filter.index_inc = slow_high_qual_coeffs.increment ;
break ;
default :
return SRC_ERR_BAD_CONVERTER ;
} ;
/*
** FIXME : This needs to be looked at more closely to see if there is
** a better way. Need to look at prepare_data () at the same time.
*/
temp_filter.b_len = lrint (2.5 * temp_filter.coeff_half_len / (temp_filter.index_inc * 1.0) * SRC_MAX_RATIO) ;
temp_filter.b_len = MAX (temp_filter.b_len, 4096) ;
temp_filter.b_len *= temp_filter.channels ;
if ((filter = calloc (1, sizeof (SINC_FILTER) + sizeof (filter->buffer [0]) * (temp_filter.b_len + temp_filter.channels))) == NULL)
return SRC_ERR_MALLOC_FAILED ;
*filter = temp_filter ;
memset (&temp_filter, 0xEE, sizeof (temp_filter)) ;
psrc->private_data = filter ;
sinc_reset (psrc) ;
count = filter->coeff_half_len ;
for (bits = 0 ; (MAKE_INCREMENT_T (1) << bits) < count ; bits++)
count |= (MAKE_INCREMENT_T (1) << bits) ;
if (bits + SHIFT_BITS - 1 >= (int) (sizeof (increment_t) * 8))
return SRC_ERR_FILTER_LEN ;
return SRC_ERR_NO_ERROR ;
} /* sinc_set_converter */
int
sinc_set_converter (SRC_PRIVATE *psrc, int src_enum)
{ SINC_FILTER *filter, temp_filter ;
int count, bits ;
/* Quick sanity check. */
if (SHIFT_BITS >= sizeof (increment_t) * 8 - 1)
return SRC_ERR_SHIFT_BITS ;
if (psrc->private_data != NULL)
{ filter = (SINC_FILTER*) psrc->private_data ;
if (filter->sinc_magic_marker != SINC_MAGIC_MARKER)
{ free (psrc->private_data) ;
psrc->private_data = NULL ;
} ;
} ;
memset (&temp_filter, 0, sizeof (temp_filter)) ;
temp_filter.sinc_magic_marker = SINC_MAGIC_MARKER ;
temp_filter.channels = psrc->channels ;
psrc->process = sinc_process ;
psrc->reset = sinc_reset ;
switch (src_enum)
{ case SRC_SINC_BEST_QUALITY :
temp_filter.coeffs = high_qual_coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (high_qual_coeffs) - 1 ;
temp_filter.index_inc = 128 ;
temp_filter.has_diffs = SRC_FALSE ;
temp_filter.coeff_len = ARRAY_LEN (high_qual_coeffs) ;
break ;
case SRC_SINC_MEDIUM_QUALITY :
temp_filter.coeffs = mid_qual_coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (mid_qual_coeffs) - 1 ;
temp_filter.index_inc = 128 ;
temp_filter.has_diffs = SRC_FALSE ;
temp_filter.coeff_len = ARRAY_LEN (mid_qual_coeffs) ;
break ;
case SRC_SINC_FASTEST :
temp_filter.coeffs = fastest_coeffs ;
temp_filter.coeff_half_len = ARRAY_LEN (fastest_coeffs) - 1 ;
temp_filter.index_inc = 128 ;
temp_filter.has_diffs = SRC_FALSE ;
temp_filter.coeff_len = ARRAY_LEN (fastest_coeffs) ;
break ;
default :
return SRC_ERR_BAD_CONVERTER ;
} ;
/*
** FIXME : This needs to be looked at more closely to see if there is
** a better way. Need to look at prepare_data () at the same time.
*/
temp_filter.b_len = 1000 + 2 * lrint (0.5 + temp_filter.coeff_len / (temp_filter.index_inc * 1.0) * SRC_MAX_RATIO) ;
temp_filter.b_len *= temp_filter.channels ;
if ((filter = calloc (1, sizeof (SINC_FILTER) + sizeof (filter->buffer [0]) * (temp_filter.b_len + temp_filter.channels))) == NULL)
return SRC_ERR_MALLOC_FAILED ;
*filter = temp_filter ;
memset (&temp_filter, 0xEE, sizeof (temp_filter)) ;
psrc->private_data = filter ;
sinc_reset (psrc) ;
count = filter->coeff_half_len ;
for (bits = 0 ; (1 << bits) < count ; bits++)
count |= (1 << bits) ;
if (bits + SHIFT_BITS - 1 >= (int) (sizeof (increment_t) * 8))
return SRC_ERR_FILTER_LEN ;
return SRC_ERR_NO_ERROR ;
} /* sinc_set_converter */
