1 files changed, 130 insertions, 0 deletions
diff --git a/src/process.c b/src/process.c
new file mode 100644
index 0000000..efb2602
--- /dev/null
+++ b/src/process.c
@@ -0,0 +1,130 @@
+// Copyright 2016-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "process.h"
+
+#include "comm.h"
+#include "log.h"
+#include "lv2_evbuf.h"
+#include "types.h"
+#include "worker.h"
+
+#include <lilv/lilv.h>
+#include <lv2/atom/atom.h>
+#include <lv2/core/lv2.h>
+#include <zix/ring.h>
+#include <zix/sem.h>
+
+#include <assert.h>
+#include <stddef.h>
+
+static int
+ring_error(const char* const message)
+{
+  jalv_log(JALV_LOG_ERR, "%s", message);
+  return 1;
+}
+
+static int
+apply_ui_events(JalvProcess* const proc, const uint32_t nframes)
+{
+  ZixRing* const    ring   = proc->ui_to_plugin;
+  JalvMessageHeader header = {NO_MESSAGE, 0U};
+  const size_t      space  = zix_ring_read_space(ring);
+  for (size_t i = 0; i < space; i += sizeof(header) + header.size) {
+    // Read message header (which includes the body size)
+    if (zix_ring_read(ring, &header, sizeof(header)) != sizeof(header)) {
+      return ring_error("Failed to read header from UI ring\n");
+    }
+
+    if (header.type == CONTROL_PORT_CHANGE) {
+      assert(header.size == sizeof(JalvControlChange));
+      JalvControlChange msg = {0U, 0.0f};
+      if (zix_ring_read(ring, &msg, sizeof(msg)) != sizeof(msg)) {
+        return ring_error("Failed to read control value from UI ring\n");
+      }
+
+      assert(msg.port_index < proc->num_ports);
+      proc->controls_buf[msg.port_index] = msg.value;
+
+    } else if (header.type == EVENT_TRANSFER) {
+      assert(header.size <= proc->process_msg_size);
+      void* const body = proc->process_msg;
+      if (zix_ring_read(ring, body, header.size) != header.size) {
+        return ring_error("Failed to read event from UI ring\n");
+      }
+
+      const JalvEventTransfer* const msg = (const JalvEventTransfer*)body;
+      assert(msg->port_index < proc->num_ports);
+      JalvProcessPort* const port = &proc->ports[msg->port_index];
+      LV2_Evbuf_Iterator     e    = lv2_evbuf_end(port->evbuf);
+      const LV2_Atom* const  atom = &msg->atom;
+      lv2_evbuf_write(
+        &e, nframes, 0U, atom->type, atom->size, LV2_ATOM_BODY_CONST(atom));
+
+    } else if (header.type == STATE_REQUEST) {
+      JalvProcessPort* const port = &proc->ports[proc->control_in];
+      assert(port->type == TYPE_EVENT);
+      assert(port->flow == FLOW_INPUT);
+      assert(port->evbuf);
+
+      LV2_Evbuf_Iterator e = lv2_evbuf_end(port->evbuf);
+      lv2_evbuf_write(&e,
+                      nframes,
+                      0U,
+                      proc->get_msg.atom.type,
+                      proc->get_msg.atom.size,
+                      &proc->get_msg.body);
+
+    } else if (header.type == RUN_STATE_CHANGE) {
+      assert(header.size == sizeof(JalvRunStateChange));
+      JalvRunStateChange msg = {JALV_RUNNING};
+      if (zix_ring_read(ring, &msg, sizeof(msg)) != sizeof(msg)) {
+        return ring_error("Failed to read run state change from UI ring\n");
+      }
+
+      proc->run_state = msg.state;
+      if (msg.state == JALV_PAUSED) {
+        zix_sem_post(&proc->paused);
+      }
+
+    } else {
+      return ring_error("Unknown message type received from UI ring\n");
+    }
+  }
+
+  return 0;
+}
+
+bool
+jalv_run(JalvProcess* const proc, const uint32_t nframes)
+{
+  // Read and apply control change events from UI
+  apply_ui_events(proc, nframes);
+
+  // Run plugin for this cycle
+  lilv_instance_run(proc->instance, nframes);
+
+  // Process any worker replies and end the cycle
+  LV2_Handle handle = lilv_instance_get_handle(proc->instance);
+  jalv_worker_emit_responses(proc->state_worker, handle);
+  jalv_worker_emit_responses(proc->worker, handle);
+  jalv_worker_end_run(proc->worker);
+
+  // Check if it's time to send updates to the UI
+  proc->pending_frames += nframes;
+  if (proc->update_frames && proc->pending_frames > proc->update_frames) {
+    proc->pending_frames = 0U;
+    return true;
+  }
+
+  return false;
+}
+
+int
+jalv_bypass(JalvProcess* const proc, const uint32_t nframes)
+{
+  // Read and apply control change events from UI
+  apply_ui_events(proc, nframes);
+  return 0;
+}