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-rw-r--r--plugins/eg-sampler.lv2/sampler.c232
-rw-r--r--plugins/eg-sampler.lv2/sampler.ttl3
2 files changed, 130 insertions, 105 deletions
diff --git a/plugins/eg-sampler.lv2/sampler.c b/plugins/eg-sampler.lv2/sampler.c
index 627ba45..9f27737 100644
--- a/plugins/eg-sampler.lv2/sampler.c
+++ b/plugins/eg-sampler.lv2/sampler.c
@@ -283,6 +283,8 @@ instantiate(const LV2_Descriptor* descriptor,
lv2_atom_forge_init(&self->forge, self->map);
peaks_sender_init(&self->psend, self->map);
+ self->gain = 1.0;
+
return (LV2_Handle)self;
}
@@ -309,16 +311,119 @@ deactivate(LV2_Handle instance)
/** Define a macro for converting a gain in dB to a coefficient. */
#define DB_CO(g) ((g) > -90.0f ? powf(10.0f, (g) * 0.05f) : 0.0f)
+/**
+ Handle an incoming event in the audio thread.
+
+ This performs any actions triggered by an event, such as the start of sample
+ playback, a sample change, or responding to requests from the UI.
+*/
+static void
+handle_event(Sampler* self, LV2_Atom_Event* ev)
+{
+ SamplerURIs* uris = &self->uris;
+ PeaksURIs* peaks_uris = &self->psend.uris;
+
+ if (ev->body.type == uris->midi_Event) {
+ const uint8_t* const msg = (const uint8_t*)(ev + 1);
+ switch (lv2_midi_message_type(msg)) {
+ case LV2_MIDI_MSG_NOTE_ON:
+ self->frame = 0;
+ self->play = true;
+ break;
+ default:
+ break;
+ }
+ } else if (lv2_atom_forge_is_object_type(&self->forge, ev->body.type)) {
+ const LV2_Atom_Object* obj = (const LV2_Atom_Object*)&ev->body;
+ if (obj->body.otype == uris->patch_Set) {
+ // Get the property and value of the set message
+ const LV2_Atom* property = NULL;
+ const LV2_Atom* value = NULL;
+ lv2_atom_object_get(obj,
+ uris->patch_property, &property,
+ uris->patch_value, &value,
+ 0);
+ if (!property) {
+ lv2_log_error(&self->logger, "Set message with no property\n");
+ return;
+ } else if (property->type != uris->atom_URID) {
+ lv2_log_error(&self->logger, "Set property is not a URID\n");
+ return;
+ }
+
+ const uint32_t key = ((const LV2_Atom_URID*)property)->body;
+ if (key == uris->eg_sample) {
+ // Sample change, send it to the worker.
+ lv2_log_trace(&self->logger, "Scheduling sample change\n");
+ self->schedule->schedule_work(self->schedule->handle,
+ lv2_atom_total_size(&ev->body),
+ &ev->body);
+ } else if (key == uris->param_gain) {
+ // Gain change
+ if (value->type == uris->atom_Float) {
+ self->gain = DB_CO(((LV2_Atom_Float*)value)->body);
+ }
+ }
+ } else if (obj->body.otype == uris->patch_Get) {
+ const LV2_Atom_URID* accept = NULL;
+ const LV2_Atom_Int* n_peaks = NULL;
+ lv2_atom_object_get_typed(
+ obj,
+ uris->patch_accept, &accept, uris->atom_URID,
+ peaks_uris->peaks_total, &n_peaks, peaks_uris->atom_Int, 0);
+ if (accept && accept->body == peaks_uris->peaks_PeakUpdate) {
+ // Received a request for peaks, prepare for transmission
+ peaks_sender_start(&self->psend,
+ self->sample->data,
+ self->sample->info.frames,
+ n_peaks->body);
+ } else {
+ // Received a get message, emit our state (probably to UI)
+ lv2_atom_forge_frame_time(&self->forge, self->frame_offset);
+ write_set_file(&self->forge, &self->uris,
+ self->sample->path,
+ self->sample->path_len);
+ }
+ } else {
+ lv2_log_trace(&self->logger,
+ "Unknown object type %d\n", obj->body.otype);
+ }
+ } else {
+ lv2_log_trace(&self->logger,
+ "Unknown event type %d\n", ev->body.type);
+ }
+
+}
+
+/**
+ Output audio for a slice of the current cycle.
+*/
+static void
+render(Sampler* self, uint32_t start, uint32_t end)
+{
+ float* output = self->output_port;
+
+ if (self->play) {
+ // Start/continue writing sample to output
+ for (; start < end; ++start) {
+ output[start] = self->sample->data[self->frame] * self->gain;
+ if (++self->frame == self->sample->info.frames) {
+ self->play = false; // Reached end of sample
+ break;
+ }
+ }
+ }
+
+ // Write silence to remaining buffer
+ for (; start < end; ++start) {
+ output[start] = 0.0f;
+ }
+}
+
static void
-run(LV2_Handle instance,
- uint32_t sample_count)
+run(LV2_Handle instance, uint32_t sample_count)
{
- Sampler* self = (Sampler*)instance;
- SamplerURIs* uris = &self->uris;
- PeaksURIs* peaks_uris = &self->psend.uris;
- sf_count_t start_frame = 0;
- sf_count_t pos = 0;
- float* output = self->output_port;
+ Sampler* self = (Sampler*)instance;
// Set up forge to write directly to notify output port.
const uint32_t notify_capacity = self->notify_port->atom.size;
@@ -338,109 +443,28 @@ run(LV2_Handle instance,
self->sample_changed = false;
}
- // Read incoming events
+ // Iterate over incoming events, emitting audio along the way
+ self->frame_offset = 0;
LV2_ATOM_SEQUENCE_FOREACH(self->control_port, ev) {
+ // Render output up to the time of this event
+ render(self, self->frame_offset, ev->time.frames);
+
+ /* Update current frame offset to this event's time. This is stored in
+ the instance because it is used for sychronous worker event
+ execution. This allows a sample load event to be executed with
+ sample accuracy when running in a non-realtime context (such as
+ exporting a session). */
self->frame_offset = ev->time.frames;
- if (ev->body.type == uris->midi_Event) {
- const uint8_t* const msg = (const uint8_t*)(ev + 1);
- switch (lv2_midi_message_type(msg)) {
- case LV2_MIDI_MSG_NOTE_ON:
- start_frame = ev->time.frames;
- self->frame = 0;
- self->play = true;
- break;
- default:
- break;
- }
- } else if (lv2_atom_forge_is_object_type(&self->forge, ev->body.type)) {
- const LV2_Atom_Object* obj = (const LV2_Atom_Object*)&ev->body;
- if (obj->body.otype == uris->patch_Set) {
- // Get the property and value of the set message
- const LV2_Atom* property = NULL;
- const LV2_Atom* value = NULL;
- lv2_atom_object_get(obj,
- uris->patch_property, &property,
- uris->patch_value, &value,
- 0);
- if (!property) {
- lv2_log_error(&self->logger,
- "patch:Set message with no property\n");
- continue;
- } else if (property->type != uris->atom_URID) {
- lv2_log_error(&self->logger,
- "patch:Set property is not a URID\n");
- continue;
- }
- const uint32_t key = ((const LV2_Atom_URID*)property)->body;
- if (key == uris->eg_sample) {
- // Sample change, send it to the worker.
- lv2_log_trace(&self->logger, "Scheduling sample change\n");
- self->schedule->schedule_work(self->schedule->handle,
- lv2_atom_total_size(&ev->body),
- &ev->body);
- } else if (key == uris->param_gain) {
- // Gain change
- if (value->type == uris->atom_Float) {
- self->gain = DB_CO(((LV2_Atom_Float*)value)->body);
- }
- }
- } else if (obj->body.otype == uris->patch_Get) {
- const LV2_Atom_URID* accept = NULL;
- const LV2_Atom_Int* n_peaks = NULL;
- lv2_atom_object_get_typed(
- obj,
- uris->patch_accept, &accept, uris->atom_URID,
- peaks_uris->peaks_total, &n_peaks, peaks_uris->atom_Int, 0);
- if (accept && accept->body == peaks_uris->peaks_PeakUpdate) {
- // Received a request for peaks, prepare for transmission
- peaks_sender_start(&self->psend,
- self->sample->data,
- self->sample->info.frames,
- n_peaks->body);
- } else {
- // Received a get message, emit our state (probably to UI)
- lv2_atom_forge_frame_time(&self->forge, self->frame_offset);
- write_set_file(&self->forge, &self->uris,
- self->sample->path,
- self->sample->path_len);
- }
- } else {
- lv2_log_trace(&self->logger,
- "Unknown object type %d\n", obj->body.otype);
- }
- } else {
- lv2_log_trace(&self->logger,
- "Unknown event type %d\n", ev->body.type);
- }
+ // Process this event
+ handle_event(self, ev);
}
+ // Use available space after any emitted events to send peaks
peaks_sender_send(&self->psend, &self->forge, sample_count, self->frame_offset);
- // Render the sample (possibly already in progress)
- if (self->play) {
- uint32_t f = self->frame;
- const uint32_t lf = self->sample->info.frames;
-
- for (pos = 0; pos < start_frame; ++pos) {
- output[pos] = 0;
- }
-
- for (; pos < sample_count && f < lf; ++pos, ++f) {
- output[pos] = self->sample->data[f] * self->gain;
- }
-
- self->frame = f;
-
- if (f == lf) {
- self->play = false;
- }
- }
-
- // Add zeros to end if sample not long enough (or not playing)
- for (; pos < sample_count; ++pos) {
- output[pos] = 0.0f;
- }
+ // Render output for the rest of the cycle past the last event
+ render(self, self->frame_offset, sample_count);
}
static LV2_State_Status
diff --git a/plugins/eg-sampler.lv2/sampler.ttl b/plugins/eg-sampler.lv2/sampler.ttl
index c6103a3..7672dba 100644
--- a/plugins/eg-sampler.lv2/sampler.ttl
+++ b/plugins/eg-sampler.lv2/sampler.ttl
@@ -56,7 +56,8 @@
lv2:name "Out"
] ;
state:state [
- <http://lv2plug.in/plugins/eg-sampler#sample> <click.wav>
+ <http://lv2plug.in/plugins/eg-sampler#sample> <click.wav> ;
+ <http://lv2plug.in/plugins/eg-sampler#gain> 1.0
] .
<http://lv2plug.in/plugins/eg-sampler#ui>
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-03 02:04:58 +0000