ao buffer timing

audio-placed-player.rkt

@@ -351,6 +351,14 @@
     (define (volume percentage)
       (set! req-volume percentage))
 
+    (define (ao-buf-ms)
+      (ao-playback-buf-ms))
+
+    (define (ao-buf-ms! ms)
+      (let ((the-ms (if (< ms 50) 50 (if (> ms 1000) 1000 ms))))
+        (ao-set-playback-buf-ms! the-ms)
+        (ao-buf-ms)))
+
     (define (state msg cb . force)
       (let ((h (make-hash)))
         (with-mutex ao-mutex
@@ -474,6 +482,12 @@
                     (let ((st #f))
                       (state "'state command" (λ (s) (set! st s)) 'force)
                       st)))
+                  ((eq? cmd 'ao-buf-ms)
+                   (do-rpc
+                    (if (null? (cdr data))
+                        (list (ao-buf-ms))
+                        (list (ao-buf-ms! (cadr data))))
+                    ))
                   (else
                    (do-rpc
                     (list 'error (format "Unknown command ~a" cmd))))

audio-player.rkt

@@ -30,6 +30,8 @@
          audio-file
          audio-play?
          audio-buf-seconds!
+         audio-ao-buf-ms!
+         audio-ao-buf-ms
          audio-known-exts?
          )
 
@@ -270,6 +272,14 @@
         (until (if (< max min) (+ min 1) (if (> max 30) 30 max))))
     ((audio-play-rpc handle) 'buf-seconds from until)))
 
+(define/contract (audio-ao-buf-ms! handle ms)
+  (-> audio-play? integer? (or/c integer? boolean?))
+  ((audio-play-rpc handle) 'ao-buf-ms ms))
+
+(define/contract (audio-ao-buf-ms handle)
+  (-> audio-play? (or/c integer? boolean?))
+  ((audio-play-rpc handle) 'ao-buf-ms))
+  
   
     
     

libao-async-ffi-racket.rkt

@@ -197,7 +197,7 @@
 ;; Playback buffer to send to libao in milliseconds
 ;; -------------------------------------------------------------------------
 
-(define ao-buf-ms 150)  ;; Playback buffer of 0.15s
+(define ao-buf-ms 350)  ;; Playback buffer of 0.35s
 
 (define (ao-playback-buf-ms)
   ao-buf-ms)