Changeset 2426:122c29dbcd87 in roaraudio

Timestamp:

08/19/09 05:12:09 (15 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

added very basic code for synth

Files:

• include/libroardsp/synth.h (modified) (1 diff)
• libroardsp/synth.c (modified) (1 diff)

include/libroardsp/synth.h

@@ -38 +38 @@
 #include "libroardsp.h"
 
+#define ROAR_SYNTH_FUNC_TYPE(name) float (*name)(float t, struct roar_synth_state * state)
+#define ROAR_SYNTH_FUNC_CAST(name) ((ROAR_SYNTH_FUNC_TYPE()) name)
+
+// SYNF -> Synthesis Function
+#define ROAR_SYNTH_SYNF_SINE ROAR_SYNTH_FUNC_CAST(sinf)
+
+struct roar_synth_state {
+ int rate;
+ struct roar_note_octave * note;
+ ROAR_SYNTH_FUNC_TYPE(func);
+ size_t pcmoffset;
+};
+
+int roar_synth_init(struct roar_synth_state * state, struct roar_note_octave * note, int rate);
+int roar_synth_set_offset(struct roar_synth_state * state, size_t offset);
+int roar_synth_set_func  (struct roar_synth_state * state, ROAR_SYNTH_FUNC_TYPE(func));
+
+int roar_synth_pcmout_i16n(struct roar_synth_state * state, int16_t * out, size_t frames, int channels);
+int roar_synth_pcmout_i161(struct roar_synth_state * state, int16_t * out, size_t frames);
+
 #endif
 

libroardsp/synth.c

@@ -25 +25 @@
 #include "libroardsp.h"
 
+#define _CHECK_BASIC() if ( state == NULL ) return -1
+
+int roar_synth_init(struct roar_synth_state * state, struct roar_note_octave * note, int rate) {
+ _CHECK_BASIC();
+
+ if ( rate <= 0 )
+  return -1;
+
+ memset(state, 0, sizeof(struct roar_synth_state));
+
+ state->note = note; // NULL is valid here!
+ state->rate = rate;
+
+ state->func = ROAR_SYNTH_SYNF_SINE;
+
+ return 0;
+}
+
+int roar_synth_set_offset(struct roar_synth_state * state, size_t offset) {
+ _CHECK_BASIC();
+
+ state->pcmoffset = offset;
+
+ return 0;
+}
+
+int roar_synth_set_func  (struct roar_synth_state * state, ROAR_SYNTH_FUNC_TYPE(func)) {
+ _CHECK_BASIC();
+
+ state->func = func;
+
+ return 0;
+}
+
+int roar_synth_pcmout_i16n(struct roar_synth_state * state, int16_t * out, size_t frames, int channels) {
+ _CHECK_BASIC();
+
+ if ( out == NULL )
+  return -1;
+
+ if ( frames == 0 )
+  return 0;
+
+ switch (channels) {
+  case 1: return roar_synth_pcmout_i161(state, out, frames);
+  default:
+    return -1;
+ }
+
+ return 0;
+}
+
+int roar_synth_pcmout_i161(struct roar_synth_state * state, int16_t * out, size_t frames) {
+ _CHECK_BASIC();
+
+ return -1;
+}
+
 
 //ll