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;;; 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:)
#:export (load-sample
sample?
sample-audio
sample-volume
set-sample-volume
play-sample
load-music
music?
music-audio
music-volume
play-music
set-music-volume
pause-music
resume-music
rewind-music
stop-music
music-paused?
music-playing?))
(SDL:open-audio)
;; Used to wrap SDL audio functions whose return values should be
;; ignored.
(define-syntax-rule (ignore-value body ...)
(begin
body ...
*unspecified*))
;; 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 or return #f if the file cannot be
loaded"
(let ((audio (SDL:load-wave filename)))
(if audio (make-sample audio) #f)))
(define (sample-volume)
"Return the volume that all samples are played at."
(SDL:volume))
(define (set-sample-volume volume)
"Set the volume that all samples are played at to VOLUME."
(ignore-value (SDL:volume volume)))
(define (play-sample sample)
"Play the given audio SAMPLE."
(ignore-value (SDL:play-channel (sample-audio sample))))
;; Wrapper over SDL music objects.
(define-record-type <music>
(make-music audio)
music?
(audio music-audio))
(define (load-music filename)
"Load music from FILENAME or return #f if the file cannot be
loaded."
(let ((audio (SDL:load-music filename)))
(if audio (make-music audio) #f)))
(define (music-volume)
"Return the volume that music is played at."
(SDL:music-volume))
(define (set-music-volume volume)
"Set the volume that music is played at to VOLUME."
(ignore-value (SDL:volume volume)))
(define (play-music music)
"Play the given MUSIC."
(ignore-value (SDL:play-music (music-audio music))))
(define (pause-music)
"Pause the current music track."
(ignore-value (SDL:pause-music)))
(define (resume-music)
"Resume the current music track."
(ignore-value (SDL:resume-music)))
(define (rewind-music)
"Restart the current music track."
(ignore-value (SDL:rewind-music)))
(define (stop-music)
"Stop playing the current music track."
(ignore-value (SDL:halt-music)))
(define (music-playing?)
"Return #t if music is currently playing, otherwise return #f."
(SDL:playing-music?))
(define (music-paused?)
"Return #t if music is currently paused, otherwise return #f."
(SDL:paused-music?))
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