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equalizer: Add band property to select the band filter type

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This allows per band configuration of a peak, low shelf or
high shelf filter, which can be very useful if the band frequencies
and widths are manually configured.
This commit is contained in:
Sebastian Dröge 2009-11-05 08:18:05 +01:00
parent 0525abd4af
commit 9405a328b1
1 changed files with 67 additions and 4 deletions
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71
gst/equalizer/gstiirequalizer.c
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@ -83,9 +83,39 @@ enum
{
PROP_GAIN = 1,
PROP_FREQ,
PROP_BANDWIDTH
PROP_BANDWIDTH,
PROP_TYPE
};
typedef enum
{
BAND_TYPE_PEAK = 0,
BAND_TYPE_LOW_SHELF,
BAND_TYPE_HIGH_SHELF
} GstIirEqualizerBandType;
#define GST_TYPE_IIR_EQUALIZER_BAND_TYPE (gst_iir_equalizer_band_type_get_type ())
static GType
gst_iir_equalizer_band_type_get_type (void)
{
static GType gtype = 0;
if (gtype == 0) {
static const GEnumValue values[] = {
{BAND_TYPE_PEAK, "Peak filter (default for inner bands)", "peak"},
{BAND_TYPE_LOW_SHELF, "Low shelf filter (default for first band)",
"low-shelf"},
{BAND_TYPE_HIGH_SHELF, "High shelf filter (default for last band)",
"high-shelf"},
{0, NULL, NULL}
};
gtype = g_enum_register_static ("GstIirEqualizerBandType", values);
}
return gtype;
}
typedef struct _GstIirEqualizerBandClass GstIirEqualizerBandClass;
#define GST_TYPE_IIR_EQUALIZER_BAND \
@ -108,6 +138,7 @@ struct _GstIirEqualizerBand
gdouble freq;
gdouble gain;
gdouble width;
GstIirEqualizerBandType type;
/* second order iir filter */
gdouble b1, b2; /* IIR coefficients for outputs */
@ -177,6 +208,22 @@ gst_iir_equalizer_band_set_property (GObject * object, guint prop_id,
}
break;
}
case PROP_TYPE:{
GstIirEqualizerBandType type;
type = g_value_get_enum (value);
GST_DEBUG_OBJECT (band, "type = %d -> %d", band->type, type);
if (type != band->type) {
GstIirEqualizer *equ =
GST_IIR_EQUALIZER (gst_object_get_parent (GST_OBJECT (band)));
equ->need_new_coefficients = TRUE;
band->type = type;
gst_object_unref (equ);
GST_DEBUG_OBJECT (band, "changed type = %d ", band->type);
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -199,6 +246,9 @@ gst_iir_equalizer_band_get_property (GObject * object, guint prop_id,
case PROP_BANDWIDTH:
g_value_set_double (value, band->width);
break;
case PROP_TYPE:
g_value_set_enum (value, band->type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -230,6 +280,12 @@ gst_iir_equalizer_band_class_init (GstIirEqualizerBandClass * klass)
"difference between bandedges in Hz",
0.0, 100000.0, 1.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_TYPE,
g_param_spec_enum ("type", "Type",
"Filter type", GST_TYPE_IIR_EQUALIZER_BAND_TYPE,
BAND_TYPE_PEAK,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
}
static void
@ -239,6 +295,7 @@ gst_iir_equalizer_band_init (GstIirEqualizerBand * band,
band->freq = 0.0;
band->gain = 0.0;
band->width = 1.0;
band->type = BAND_TYPE_PEAK;
}
static GType
@ -545,11 +602,14 @@ update_coefficients (GstIirEqualizer * equ)
{
gint i, n = equ->freq_band_count;
setup_low_shelf_filter (equ, equ->bands[0]);
for (i = 1; i < n - 1; i++) {
setup_peak_filter (equ, equ->bands[i]);
if (equ->bands[i]->type == BAND_TYPE_PEAK)
setup_peak_filter (equ, equ->bands[i]);
else if (equ->bands[i]->type == BAND_TYPE_LOW_SHELF)
setup_low_shelf_filter (equ, equ->bands[i]);
else
setup_high_shelf_filter (equ, equ->bands[i]);
}
setup_high_shelf_filter (equ, equ->bands[n - 1]);
equ->need_new_coefficients = FALSE;
}
@ -614,6 +674,7 @@ gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count)
freq0 = LOWEST_FREQ;
for (i = 0; i < new_count; i++) {
freq1 = freq0 * step;
equ->bands[i]->type = BAND_TYPE_PEAK;
equ->bands[i]->freq = freq0 + ((freq1 - freq0) / 2.0);
equ->bands[i]->width = freq1 - freq0;
GST_DEBUG ("band[%2d] = '%lf'", i, equ->bands[i]->freq);
@ -627,6 +688,8 @@ gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count)
*/
freq0 = freq1;
}
equ->bands[0]->type = BAND_TYPE_LOW_SHELF;
equ->bands[new_count - 1]->type = BAND_TYPE_HIGH_SHELF;
equ->need_new_coefficients = TRUE;
}