229 lines
7.0 KiB
Racket
229 lines
7.0 KiB
Racket
(module taglib racket/base
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(require "taglib-ffi.rkt"
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"../utils/utils.rkt"
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racket/draw)
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(provide id3-tags
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tags-valid?
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tags-title
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tags-album
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tags-artist
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tags-comment
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tags-year
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tags-genre
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tags-track
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tags-length
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tags-sample-rate
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tags-bit-rate
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tags-channels
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tags-keys
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tags-ref
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tags-picture
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tags-picture->bitmap
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tags->hash
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id3-picture-mimetype
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id3-picture-kind
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id3-picture-size
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id3-picture-bytes
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)
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(define-struct id3-tag-struct
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(handle))
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(define-struct id3-picture
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(mimetype kind size bytes))
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(define (id3-tags file)
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(let ((valid? #f)
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(title "")
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(album "")
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(artist "")
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(comment "")
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(year -1)
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(genre "")
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(track -1)
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(length -1)
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(sample-rate -1)
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(bit-rate -1)
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(channels -1)
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(key-store (make-hash))
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(composer "")
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(album-artist "")
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(disc-number -1)
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(picture #f))
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(let ((tag-file (taglib_file_new file)))
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(set! valid? (taglib_file_is_valid tag-file))
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(when valid?
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(let ((tag (taglib_file_tag tag-file))
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(ap (taglib_file_audioproperties tag-file))
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(cp (lambda (s) (string-append s "")))
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)
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(set! title (cp (taglib_tag_title tag)))
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(set! album (cp (taglib_tag_album tag)))
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(set! artist (cp (taglib_tag_artist tag)))
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(set! comment (cp (taglib_tag_comment tag)))
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(set! genre (cp (taglib_tag_genre tag)))
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(set! year (taglib_tag_year tag))
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(set! track (taglib_tag_track tag))
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(set! length (taglib_audioproperties_length ap))
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(set! sample-rate (taglib_audioproperties_samplerate ap))
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(set! bit-rate (taglib_audioproperties_bitrate ap))
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(set! channels (taglib_audioproperties_channels ap))
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(let* ((keys (taglib_property_keys tag-file))
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(i 0)
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(key (taglib_property_key keys i))
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(key-list '())
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)
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(while (not (eq? key #f))
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(set! key-list (append key-list (list (cp key))))
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(set! i (+ i 1))
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(set! key (taglib_property_key keys i)))
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(for-each (lambda (key)
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(let ((props (taglib_property_get tag-file key)))
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(let* ((vals '())
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(i 0)
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(val (taglib_property_val props i)))
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(while (not (eq? val #f))
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(set! vals (append vals (list (cp val))))
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(set! i (+ i 1))
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(set! val (taglib_property_val props i)))
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(taglib_property_free props)
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(hash-set! key-store
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(string->symbol
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(string-downcase key)) vals)
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)))
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key-list)
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(set! composer (hash-ref key-store 'composer ""))
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(set! album-artist (hash-ref key-store 'albumartist ""))
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(set! disc-number (string->number
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(car
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(hash-ref key-store 'discnumber (list "-1")))))
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)
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; picture
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(let ((p (taglib-get-picture tag-file)))
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(if (eq? p #f)
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(set! picture #f)
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(let ((mimetype (car p))
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(kind (caddr p))
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(size (cadddr p))
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(bytes (car (cddddr p))))
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(set! picture (make-id3-picture mimetype kind size bytes))
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)))
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; cleaning up
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(taglib_tag_free_strings)
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(taglib_file_free tag-file)
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)
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)
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(let ((handle
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(lambda (v . args)
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(cond
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[(eq? v 'valid?) valid?]
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[(eq? v 'title) title]
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[(eq? v 'album) album]
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[(eq? v 'artist) artist]
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[(eq? v 'comment) comment]
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[(eq? v 'composer) composer]
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[(eq? v 'genre) genre]
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[(eq? v 'year) year]
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[(eq? v 'track) track]
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[(eq? v 'length) length]
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[(eq? v 'sample-rate) sample-rate]
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[(eq? v 'bit-rate) bit-rate]
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[(eq? v 'channels) channels]
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[(eq? v 'keys) (hash-keys key-store)]
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[(eq? v 'val)
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(if (null? args)
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#f
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(hash-ref key-store (car args) #f))]
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[(eq? v 'picture) picture]
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[(eq? v 'to-hash)
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(let ((h (make-hash)))
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(hash-set! h 'valid? valid?)
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(hash-set! h 'title title)
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(hash-set! h 'album album)
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(hash-set! h 'artist artist)
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(hash-set! h 'comment comment)
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(hash-set! h 'composer composer)
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(hash-set! h 'genre genre)
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(hash-set! h 'year year)
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(hash-set! h 'track track)
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(hash-set! h 'length length)
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(hash-set! h 'sample-rate sample-rate)
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(hash-set! h 'bit-rate bit-rate)
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(hash-set! h 'channels channels)
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(hash-set! h 'picture picture)
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(hash-set! h 'keys (hash-keys key-store))
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h)]
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[else (error (format "Unknown tag-cmd '~a'" v))]
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))))
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(make-id3-tag-struct handle))
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)))
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(define-syntax def
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(syntax-rules ()
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((_ (fun v))
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(define (fun tags . args)
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(apply (id3-tag-struct-handle tags) (cons v args)))
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)))
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(define-syntax defs
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(syntax-rules ()
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((_ f1)
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(def f1))
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((_ f1 f2 ...)
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(begin
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(def f1)
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(def f2)
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...))
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))
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(defs
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(tags-valid? 'valid?)
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(tags-title 'title)
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(tags-album 'album)
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(tags-artist 'artist)
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(tags-comment 'comment)
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(tags-genre 'genre)
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(tags-composer 'composer)
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(tags-year 'year)
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(tags-track 'track)
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(tags-length 'length)
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(tags-sample-rate 'sample-rate)
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(tags-bit-rate 'bit-rate)
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(tags-channels 'channels)
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(tags-keys 'keys)
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(tags-ref 'val)
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(tags-picture 'picture)
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(tags->hash 'to-hash)
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)
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(define (tags-picture->bitmap tags)
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(let ((p (tags-picture tags)))
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(if (eq? p #f)
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#f
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(let* ((in (open-input-bytes (id3-picture-bytes p)))
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(btm (read-bitmap in)))
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(close-input-port in)
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btm))))
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); end of module
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