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audioconvert: add optional hilbert transform to rear channels

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Add an option to do a hilbert transform on the generated rear channels
to do a 90 degree pahse shift on them. This can improve spacialization
of the rear channels.

See #861
This commit is contained in:
Wim Taymans 2021-03-09 21:07:37 +01:00
parent 5dd0a12875
commit 5b3388e4ac
9 changed files with 121 additions and 17 deletions
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13
spa/plugins/audioconvert/channelmix.c
View file

@ -527,6 +527,15 @@ static int impl_node_enum_params(void *object, int seq,
this->mix.widen, 0.0, 1.0),
SPA_PROP_INFO_params, SPA_POD_Bool(true));
break;
case 15:
param = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_PropInfo, id,
SPA_PROP_INFO_name, SPA_POD_String("channelmix.hilbert-taps"),
SPA_PROP_INFO_description, SPA_POD_String("Taps for phase shift of rear"),
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(
this->mix.hilbert_taps, 0, MAX_TAPS),
SPA_PROP_INFO_params, SPA_POD_Bool(true));
break;
default:
return 0;
}
@ -582,6 +591,8 @@ static int impl_node_enum_params(void *object, int seq,
spa_pod_builder_float(&b, this->mix.rear_delay);
spa_pod_builder_string(&b, "channelmix.stereo-widen");
spa_pod_builder_float(&b, this->mix.widen);
spa_pod_builder_string(&b, "channelmix.hilbert-taps");
spa_pod_builder_int(&b, this->mix.hilbert_taps);
spa_pod_builder_pop(&b, &f[1]);
param = spa_pod_builder_pop(&b, &f[0]);
break;
@ -621,6 +632,8 @@ static int channelmix_set_param(struct impl *this, const char *k, const char *s)
spa_atof(s, &this->mix.rear_delay);
else if (spa_streq(k, "channelmix.stereo-widen"))
spa_atof(s, &this->mix.widen);
else if (spa_streq(k, "channelmix.hilbert-taps"))
spa_atou32(s, &this->mix.hilbert_taps, 0);
else
return 0;
return 1;