bl00mbox: minor fixes (concurrency issue, faster delay)

components/bl00mbox/bl00mbox_user.c

@@ -709,7 +709,7 @@ bool bl00mbox_channel_bud_set_signal_value(uint8_t channel, uint32_t bud_index,
     while(bud->is_being_rendered) {};
 
     if(value == -32678){
-        sig->value = 0;
+        sig->value = -32767;
     } else {
         sig->value = value;
     }

components/bl00mbox/radspa/radspa.h

@@ -76,7 +76,7 @@ typedef struct _radspa_signal_t{
     // buffer full of samples, may be NULL.
     int16_t * buffer;
     // static value to be used when buffer is NULL for input signals only
-    int16_t value;
+    volatile int16_t value;
     // when the signal has last requested to render its source
     uint32_t render_pass_id;
 } radspa_signal_t;

components/bl00mbox/radspa/standard_plugin_lib/delay.c

@@ -34,10 +34,16 @@ void delay_run(radspa_t * delay, uint16_t num_samples, uint32_t render_pass_id){
     static int16_t ret = 0;
     
     uint32_t buffer_size = delay->plugin_table_len;
+    uint32_t time = radspa_signal_get_value(time_sig, 0, render_pass_id);
+    if(time > data->max_delay) time = data->max_delay;
+    int16_t fb = radspa_signal_get_value(feedback_sig, 0, render_pass_id);
+    int16_t level = radspa_signal_get_value(level_sig, 0, render_pass_id);
+
+    int16_t dry_vol = radspa_signal_get_value(dry_vol_sig, 0, render_pass_id);
+    int16_t rec_vol = radspa_signal_get_value(rec_vol_sig, 0, render_pass_id);
+
     
     for(uint16_t i = 0; i < num_samples; i++){
-        uint32_t time = radspa_signal_get_value(time_sig, i, render_pass_id);
-        if(time > data->max_delay) time = data->max_delay;
 
         data->write_head_position++;
         while(data->write_head_position >= buffer_size) data->write_head_position -= buffer_size; // maybe faster than %
@@ -56,12 +62,6 @@ void delay_run(radspa_t * delay, uint16_t num_samples, uint32_t render_pass_id){
         int16_t dry = radspa_signal_get_value(input_sig, i, render_pass_id);
         int16_t wet = buf[data->read_head_position];
 
-        int16_t fb = radspa_signal_get_value(feedback_sig, i, render_pass_id);
-        int16_t level = radspa_signal_get_value(level_sig, i, render_pass_id);
-
-        int16_t dry_vol = radspa_signal_get_value(dry_vol_sig, i, render_pass_id);
-        int16_t rec_vol = radspa_signal_get_value(rec_vol_sig, i, render_pass_id);
-
         if(rec_vol){
             buf[data->write_head_position] = radspa_add_sat(radspa_mult_shift(rec_vol, dry), radspa_mult_shift(wet,fb));
         }