Ajout octaver

Appli/Core/Inc/fx_octaver.h

@@ -0,0 +1,44 @@
+#ifndef FX_OCTAVER_H
+#define FX_OCTAVER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FX_OCTAVER_BUFFER_SIZE  2048U   /* buffer circulaire (puissance de 2) */
+#define FX_OCTAVER_GRAIN_SIZE   1024U   /* taille de grain, en echantillons (~21ms a 48kHz) */
+#define FX_OCTAVER_NUM_VOICES   4U      /* -2oct, -1oct, +1oct, +2oct (la voie seche est geree a part) */
+
+typedef struct
+{
+    bool  enabled;
+    float level_down2;  /* niveau voix -2 octaves, 0.0 a 1.0 */
+    float level_down1;  /* niveau voix -1 octave,  0.0 a 1.0 */
+    float level_dry;    /* niveau voix originale,  0.0 a 1.0 */
+    float level_up1;    /* niveau voix +1 octave,  0.0 a 1.0 */
+    float level_up2;    /* niveau voix +2 octaves, 0.0 a 1.0 */
+} FxOctaverParams;
+
+typedef struct
+{
+    float delay[2];  /* decalage courant (en echantillons) des deux grains en fondu croise */
+} FxOctaverVoiceState;
+
+typedef struct
+{
+    float    buffer[FX_OCTAVER_BUFFER_SIZE];
+    uint32_t write_idx;
+    FxOctaverVoiceState voices[FX_OCTAVER_NUM_VOICES];
+} FxOctaverState;
+
+void  FxOctaver_Init(FxOctaverState *state, FxOctaverParams *params);
+float FxOctaver_Process(FxOctaverState *state, const FxOctaverParams *params, float input);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* FX_OCTAVER_H */