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Convert the oversampling to next power of 2

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This commit is contained in:
Paul Ferrand 2020-05-13 15:11:50 +02:00
parent f51ccb24a6
commit cced103479
2 changed files with 31 additions and 13 deletions
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2
.gitignore vendored
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@ -32,3 +32,5 @@ node_modules/
*.lock
*.sublime-*
*.code-*
.kak.tags.namecache
.clangd

42
lv2/sfizz.c
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@ -534,23 +534,39 @@ sfizz_lv2_status_log(sfizz_plugin_t *self)
// lv2_log_note(&self->logger, "[sfizz] Active voices: %d\n", sfizz_get_num_active_voices(self->synth));
}
static uint32_t next_pow_2(uint32_t v)
{
// Bit twiddling hack
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
static void
sfizz_lv2_check_oversampling(sfizz_plugin_t* self)
{
sfizz_oversampling_factor_t oversampling = (sfizz_oversampling_factor_t)*self->oversampling_port;
if (oversampling != self->oversampling)
if (*self->oversampling_port < 0)
return;
uint32_t port_value = (uint32_t)*self->oversampling_port;
if (port_value == (uint32_t)self->oversampling)
return;
self->oversampling = (sfizz_oversampling_factor_t)next_pow_2(port_value);
LV2_Atom_Int atom;
atom.atom.type = self->sfizz_oversampling_uri;
atom.atom.size = sizeof(int);
atom.body = self->oversampling;
if (self->worker->schedule_work(self->worker->handle,
lv2_atom_total_size((LV2_Atom *)&atom),
&atom) != LV2_WORKER_SUCCESS)
{
LV2_Atom_Int atom;
atom.atom.type = self->sfizz_oversampling_uri;
atom.atom.size = sizeof(int);
atom.body = oversampling;
if (self->worker->schedule_work(self->worker->handle,
lv2_atom_total_size((LV2_Atom *)&atom),
&atom) != LV2_WORKER_SUCCESS)
{
lv2_log_error(&self->logger, "[sfizz] There was an issue changing the oversampling factor\n");
}
self->oversampling = oversampling;
lv2_log_error(&self->logger, "[sfizz] There was an issue changing the oversampling factor\n");
}
}