Implement xas_synth_set_type()

Implement xas_synth_set_type() to allow changing oscillator type
during synthesis

2 files changed, 30 insertions, 12 deletions

diff --git a/include/xas/synth.h b/include/xas/synth.h
index 6902643..ca83c69 100644
--- a/include/xas/synth.h
+++ b/include/xas/synth.h
@@ -53,6 +53,8 @@ void xas_synth_set_gain(xas_synth *synth, float gain);
 
 void xas_synth_set_frequency(xas_synth *synth, size_t frequency);
 
+void xas_synth_set_type(xas_synth *synth, enum xas_synth_type type);
+
 void xas_synth_start(xas_synth *synth);
 
 void xas_synth_stop(xas_synth *synth);
diff --git a/src/synth.c b/src/synth.c
index 6057ce3..b01ebc8 100644
--- a/src/synth.c
+++ b/src/synth.c
@@ -117,6 +117,27 @@ static int set_gain(xas_synth *synth, float gain) {
     return 0;
 }
 
+static int set_type(xas_synth *synth, enum xas_synth_type type) {
+    switch (type) {
+        case XAS_SYNTH_SINE:     synth->sample = sample_sine;     break;
+        case XAS_SYNTH_SQUARE:   synth->sample = sample_square;   break;
+        case XAS_SYNTH_TRIANGLE: synth->sample = sample_triangle; break;
+        case XAS_SYNTH_SAWTOOTH: synth->sample = sample_sawtooth; break;
+
+        default:
+            errno = EINVAL;
+
+            goto error_invalid_type;
+    }
+
+    synth->type = type;
+
+    return 0;
+
+error_invalid_type:
+    return -1;
+}
+
 xas_synth *xas_synth_new(xas_audio_format format,
                              size_t buffer_size,
                              enum xas_synth_type type) {
@@ -132,7 +153,6 @@ xas_synth *xas_synth_new(xas_audio_format format,
     synth->obj.stream_new = (xas_object_stream_new_callback)xas_synth_stream_new;
     synth->obj.destroy    = (xas_object_destroy_callback)xas_synth_destroy;
 
-    synth->type      = type;
     synth->state     = XAS_SYNTH_IDLE;
     synth->phase     = 0.0f;
     synth->gain      = XAS_SYNTH_DEFAULT_GAIN;
@@ -143,21 +163,13 @@ xas_synth *xas_synth_new(xas_audio_format format,
     synth->format.sample_rate = format.sample_rate;
     synth->buffer_size        = buffer_size;
 
-    switch (type) {
-        case XAS_SYNTH_SINE:     synth->sample = sample_sine;     break;
-        case XAS_SYNTH_SQUARE:   synth->sample = sample_square;   break;
-        case XAS_SYNTH_TRIANGLE: synth->sample = sample_triangle; break;
-        case XAS_SYNTH_SAWTOOTH: synth->sample = sample_sawtooth; break;
-
-        default:
-            errno = EINVAL;
-
-            goto error_invalid_type;
+    if (set_type(synth, type) < 0) {
+        goto error_set_type;
     }
 
     return synth;
 
-error_invalid_type:
+error_set_type:
     free(synth);
 
 error_malloc_synth:
@@ -172,6 +184,10 @@ void xas_synth_set_gain(xas_synth *synth, float gain) {
     synth->gain = gain;
 }
 
+void xas_synth_set_type(xas_synth *synth, enum xas_synth_type type) {
+    set_type(synth, type);
+}
+
 void xas_synth_set_frequency(xas_synth *synth, size_t frequency) {
     synth->frequency = frequency;
 }