277 lines
9.2 KiB
Racket
277 lines
9.2 KiB
Racket
(module utils racket/base
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(require racket/path
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racket/runtime-path
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ffi/unsafe
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setup/dirs
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"downloader.rkt"
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simple-log
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)
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(provide while
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until
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build-lib-path
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get-lib
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do-for
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dbg-sound
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info-sound
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err-sound
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warn-sound
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fatal-sound
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sync-log-sound
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integer->int-bytes
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int-bytes->integer
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valid-ffmpeg-versions
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make-mutex
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mutex-lock
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mutex-unlock
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with-mutex
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)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Create log definitions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(sl-def-log racket-sound sound)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Mutex definitions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-struct mutex
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(thread count mut own) #:mutable)
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(define make-mutex-struct make-mutex)
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(set! make-mutex (λ ()
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(make-mutex-struct #f 0 (make-semaphore 1) (make-semaphore 1))))
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(define (mutex-lock m)
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(semaphore-wait (mutex-own m))
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(if (eq? (mutex-thread m) (current-thread))
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(begin
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(set-mutex-count! m (+ (mutex-count m) 1))
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(semaphore-post (mutex-own m))
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)
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(begin
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(semaphore-post (mutex-own m))
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(semaphore-wait (mutex-mut m))
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(set-mutex-count! m 1)
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(set-mutex-thread! m (current-thread)))
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)
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)
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(define (mutex-unlock m)
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(semaphore-wait (mutex-own m))
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(let ((count (mutex-count m)))
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(set! count (- count 1))
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(set-mutex-count! m count)
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(if (= count 0)
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(begin
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(set-mutex-thread! m #f)
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(semaphore-post (mutex-own m))
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(semaphore-post (mutex-mut m)))
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(semaphore-post (mutex-own m)))
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)
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)
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(define-syntax with-mutex
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(syntax-rules ()
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((_ m b1 ...)
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(begin
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(dynamic-wind
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(λ () (mutex-lock m))
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(λ () b1 ...)
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(λ () (mutex-unlock m)))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Provide some loop constructions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-syntax while
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(syntax-rules ()
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((_ cond body ...)
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(letrec ((while-f (lambda (last-result)
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(if cond
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(let ((last-result (begin
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body
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...)))
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(while-f last-result))
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last-result))))
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(while-f #f))
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)
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))
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(define-syntax until
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(syntax-rules ()
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((_ cond body ...)
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(letrec ((until-f (lambda (last-result)
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(if cond
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last-result
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(let ((last-reult (begin
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body
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...)))
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(until-f last-result))))))
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(until-f #f)))))
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(define-syntax do-for
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(syntax-rules ()
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((_ (init cond next) body ...)
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(begin
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init
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(letrec ((do-for-f (lamba ()
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(if cond
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(begin
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(begin
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body
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...)
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next
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(do-for-f))))))
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(do-for-f))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Loading libraries
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define valid-ffmpeg-versions
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(make-hash (list (list 'avutil 58 60 "libavcodec")
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(list 'avcodec 60 62 "libavutil")
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(list 'avformat 60 62 "libswresample")
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(list 'swresample 4 6 "libavformat")
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))
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)
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(define (version-str kind)
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(let ((v (hash-ref valid-ffmpeg-versions kind)))
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(format " - ~a~a - ~a~a\n" (caddr v) (car v) (caddr v) (cadr v))
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)
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)
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(define (lib-not-found-message orig-libs libs-path)
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(displayln (format "Warning: Cannot find library, tried ~a in ~a" orig-libs libs-path))
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(let ((st (system-type 'os*)))
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(cond ((eq? st 'windows)
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(displayln
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(format
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"\nLibraries for Windows should have been downloaded to\n\n - ~a\n"
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(soundlibs-directory))))
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((eq? st 'linux)
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(displayln
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(string-append
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"Make sure you have installed the following libraries,\n"
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"e.g. on a debian based system with apt:\n"
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"\n"
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" FLAC : sudo apt install libflac12\n"
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" mpg123 : libmpg123-0\n"
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" libao : libao4\n"
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" ffmpeg : libavcodec60 libavutil58 libswresample4 libavformat60\n"
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"\n"
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)))
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((eq? st 'macosx)
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(displayln
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(string-append
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"Make sure you have the right libraries installed, using 'homebrew', see https://brew.sh/\n"
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"\n"
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" brew install ffmpeg-full\n"
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" brew install libao\n"
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" brew install mpg123\n"
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" brew install flac\n"
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"\n"
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)))
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(else
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(displayln
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(string-append
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"Make sure you have the right libraries installed on your system and reachable by racket\n"
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"\n"
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"You need following libraries:\n"
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"\n"
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"- xiph libao (https://xiph.org).\n"
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"- xiph libFLAC (https://xiph.org).\n"
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"- ffmpeg of the right version (https://ffmpeg.org).\n"
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"- libmpg123 (https://mpg123.org).\n"
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"\n")
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))
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)
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(displayln
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(string-append "NB. currently supported major versions for the ffmpeg libraries are:\n"
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"\n"
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(version-str 'avcodec)
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(version-str 'avutil)
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(version-str 'swresample)
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(version-str 'avformat)
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"\n"
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))
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)
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)
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(define (build-lib-path p)
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(if (eq? (system-type 'os) 'macosx)
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(let ((brew-lib "/opt/homebrew/lib"))
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(cons (soundlibs-directory) (cons brew-lib p)))
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(cons (soundlibs-directory) p)))
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(define (get-lib* libs-to-try orig-libs versions)
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(unless (soundlibs-available?)
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(download-soundlibs))
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(let ((libs-path (build-lib-path (get-lib-search-dirs))))
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(if (null? libs-to-try)
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(begin
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(lib-not-found-message orig-libs libs-path)
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#f)
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(ffi-lib (car libs-to-try) versions
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#:get-lib-dirs (λ () libs-path)
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#:fail (λ ()
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(ffi-lib (car libs-to-try) versions
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#:fail (λ ()
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(get-lib* (cdr libs-to-try) orig-libs versions))))
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)
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)
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)
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)
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(define (get-lib libs-to-try versions)
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(get-lib* libs-to-try libs-to-try versions))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; integer->int-bytes and vise versa.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-syntax-rule (integer->int-bytes v size signed? big? bs pos)
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(if (= size 3)
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(if big?
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(begin
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(bytes-set! bs pos (bitwise-and (arithmetic-shift v -16) #xff))
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(bytes-set! bs (+ pos 1) (bitwise-and (arithmetic-shift v -8) #xff))
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(bytes-set! bs (+ pos 2) (bitwise-and v #xff)))
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(begin
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(bytes-set! bs pos (bitwise-and v #xff))
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(bytes-set! bs (+ pos 1) (bitwise-and (arithmetic-shift v -8) #xff))
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(bytes-set! bs (+ pos 2) (bitwise-and (arithmetic-shift v -16) #xff))))
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(integer->integer-bytes v size signed? big? bs pos)))
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(define-syntax-rule (int-bytes->integer bs signed? big? start end)
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(let ([size (- end start)])
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(if (= size 3)
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(let* ([b0 (bytes-ref bs start)]
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[b1 (bytes-ref bs (+ start 1))]
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[b2 (bytes-ref bs (+ start 2))]
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[u (if big?
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(bitwise-ior (arithmetic-shift b0 16)
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(arithmetic-shift b1 8)
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b2)
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(bitwise-ior b0
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(arithmetic-shift b1 8)
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(arithmetic-shift b2 16)))])
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(if (and signed? (not (zero? (bitwise-and u #x800000))))
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(- u #x1000000)
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u))
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(integer-bytes->integer bs signed? big? start end))))
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) ; end of module
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