Add audio module.

This is just a think layer over some basic SDL mixer functions so that
users don't need to deal with SDL directly.

1 files changed, 80 insertions, 0 deletions

diff --git a/2d/audio.scm b/2d/audio.scm
new file mode 100644
index 0000000..d67eebe
--- /dev/null
+++ b/2d/audio.scm
@@ -0,0 +1,80 @@
+;;; guile-2d
+;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; Guile-2d is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; Guile-2d is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Wrappers over SDL mixer.
+;;
+;;; Code:
+
+(define-module (2d audio)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-2)
+  #:use-module ((sdl mixer) #:prefix SDL:))
+
+;; Wrapper over SDL audio objects.
+(define-record-type <sample>
+  (make-sample audio)
+  sample?
+  (audio sample-audio))
+
+(define (load-sample filename)
+  "Load audio sample from FILENAME. Return #f on failure."
+  (let ((audio (SDL:load-wave filename)))
+    (if audio
+        (make-sample audio)
+        #f)))
+
+(define (sample-play sample)
+  "Play SAMPLE."
+  (SDL:play-channel (sample-audio sample)))
+
+(export make-sample
+        load-sample
+        sample?
+        sample-audio
+        sample-play)
+
+;; Wrapper over SDL music objects.
+(define-record-type <music>
+  (make-music audio)
+  music?
+  (audio music-audio))
+
+(define (load-music filename)
+  "Load music from FILENAME. Return #f on failure."
+  (let ((audio (SDL:load-music filename)))
+    (if audio
+        (make-music audio)
+        #f)))
+
+(define (music-play music)
+  "Play MUSIC."
+  (SDL:play-music (music-audio music)))
+
+(export make-music
+        load-music
+        music?
+        music-audio
+        music-play)
+
+(re-export (SDL:pause-music . music-pause)
+           (SDL:resume-music . music-resume)
+           (SDL:rewind-music . music-rewind)
+           (SDL:halt-music . music-stop)
+           (SDL:paused-music? . music-paused?)
+           (SDL:playing-music? . music-playing?))