* flac support

* taglib support
It is possible to play some music already.

play-test.rkt

@@ -0,0 +1,20 @@
+#lang racket/base
+(require "libao/libao.rkt"
+         "libflac/flac-decoder.rkt"
+         )
+
+
+
+(define fmt (ao-mk-format 16 44100 2 'big-endian))
+(define ao-h (ao-open-live #f fmt))
+
+(define (flac-play frame buffer)
+  (ao-play ao-h buffer))
+
+(define (flac-meta meta)
+  (displayln meta))
+
+(define flac-h (flac-open test-file3 flac-meta flac-play))
+
+(flac-read flac-h)
+