xmas-egg

libs/plugins/reasonablesynth.lv2/lv2.c

@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <time.h>
 
 /* LV2 */
 #include "lv2/lv2plug.in/ns/lv2core/lv2.h"
@@ -56,6 +57,7 @@ typedef struct {
 
   double SampleRateD;
   void *synth;
+  bool xmas;
 } RSynth;
 
 /* main LV2 */
@@ -98,6 +100,16 @@ instantiate(const LV2_Descriptor*     descriptor,
   self->synth = synth_alloc();
   synth_init(self->synth, rate);
 
+
+  struct tm date;
+  time_t now;
+  time(&now);
+  localtime_r(&now, &date);
+  if (getenv("ITSXMAS") || (date.tm_mon == 11 /*dec*/ && date.tm_mday == 25)) {
+    printf("reasonable synth.lv2 says: happy holidays!\n");
+    self->xmas = true;
+  }
+
   return (LV2_Handle)self;
 }
 
@@ -146,8 +158,12 @@ run(LV2_Handle handle, uint32_t n_samples)
           written = synth_sound(self->synth, written, ev->time.frames, audio);
         }
         /* send midi message to synth */
+        if (self->xmas) {
+          synth_parse_xmas(self->synth, (const uint8_t*)(ev+1), ev->body.size);
+        } else {
           synth_parse_midi(self->synth, (const uint8_t*)(ev+1), ev->body.size);
         }
+      }
       ev = (LV2_Atom_Event const*) // lv2_atom_sequence_next()
         ((const uint8_t*)ev + sizeof(LV2_Atom_Event) + ((ev->body.size + 7) & ~7));
     }

libs/plugins/reasonablesynth.lv2/rsynth.c

@@ -89,6 +89,8 @@ typedef struct {
   float          kcgain;
   float          kcfilt;
   double         rate;
+  uint32_t       xmas_on;
+  uint32_t       xmas_off;
 } RSSynthesizer;
 
 
@@ -446,6 +448,44 @@ static void synth_parse_midi(void *synth, const uint8_t *data, const size_t size
   synth_process_midi_event(synth, &ev);
 }
 
+static const uint8_t jingle[] = { 71 ,71 ,71 ,71 ,71 ,71 ,71 ,74 ,67 ,69 ,71 ,72 ,72 ,72 ,72 ,72 ,71 ,71 ,71 ,71 ,71 ,69 ,69 ,71 ,69 ,74 ,71 ,71 ,71 ,71 ,71 ,71 ,71 ,74 ,67 ,69 ,71 ,72 ,72 ,72 ,72 ,72 ,71 ,71 ,71 ,71 ,74 ,74 ,72 ,69 ,67 ,62 ,62 ,71 ,69 ,67 ,62 ,62 ,62 ,62 ,71 ,69 ,67 ,64 ,64 ,64 ,72 ,71 ,69 ,66 ,74 ,76 ,74 ,72 ,69 ,71 ,62 ,62 ,71 ,69 ,67 ,62 ,62 ,62 ,62 ,71 ,69 ,67 ,64 ,64 ,64 ,72 ,71 ,69 ,74 ,74 ,74 ,74 ,76 ,74 ,72 ,69 ,67 ,74 ,71 ,71 ,71 ,71 ,71 ,71 ,71 ,74 ,67 ,69 ,71 ,72 ,72 ,72 ,72 ,72 ,71 ,71 ,71 ,71 ,71 ,69 ,69 ,71 ,69 ,74 ,71 ,71 ,71 ,71 ,71 ,71 ,71 ,74 ,67 ,69 ,71 ,72 ,72 ,72 ,72 ,72 ,71 ,71 ,71 ,71 ,74 ,74 ,72 ,69 ,67 };
+
+static void synth_parse_xmas(void *synth, const uint8_t *data, const size_t size) {
+  RSSynthesizer* rs = (RSSynthesizer*)synth;
+  if (size < 2 || size > 3) return;
+  // All messages need to be 3 bytes; except program-changes: 2bytes.
+  if (size == 2 && (data[0] & 0xf0)  != 0xC0) return;
+
+  struct rmidi_event_t ev;
+
+  ev.channel = data[0]&0x0f;
+  switch (data[0] & 0xf0) {
+    case 0x80:
+      ev.type=NOTE_OFF;
+      ev.d.tone.note=jingle[rs->xmas_off++];
+      ev.d.tone.velocity=data[2]&0x7f;
+      if (rs->xmas_off >= sizeof(jingle)) rs->xmas_off = 0;
+      break;
+    case 0x90:
+      ev.type=NOTE_ON;
+      ev.d.tone.note=jingle[rs->xmas_on++];
+      ev.d.tone.velocity=data[2]&0x7f;
+      if (rs->xmas_on >= sizeof(jingle)) rs->xmas_on = 0;
+      break;
+    case 0xB0:
+      ev.type=CONTROL_CHANGE;
+      ev.d.control.param=data[1]&0x7f;
+      ev.d.control.value=data[2]&0x7f;
+      break;
+    case 0xC0:
+      ev.type=PROGRAM_CHANGE;
+      ev.d.control.value=data[1]&0x7f;
+      break;
+    default:
+      return;
+  }
+  synth_process_midi_event(synth, &ev);
+}
 /**
  * initialize the synth
  * This should be called after synth_alloc()
@@ -470,6 +510,8 @@ static void synth_init(void *synth, double rate) {
   for (c=0; c < 16; c++) {
     synth_load(&rs->sc[c], rate, &synthesize_sineP, &piano_adsr);
   }
+  rs->xmas_on = 0;
+  rs->xmas_off = 0;
 }
 
 /**