initial flac metadata read
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2235eadf04
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1dfba430a8
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Steve Ayerhart
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! Copyright (C) 2020 .
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! See http://factorcode.org/license.txt for BSD license.
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USING: alien.syntax math io.encodings.binary kernel io io.files locals endian bit-arrays ;
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USING: prettyprint ;
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USING: flac.metadata.private flac.metadata ;
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QUALIFIED: bitstreams
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IN: flac.decoder
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ALIAS: read-bit bitstreams:read
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CONSTANT: sync-code 16382
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ERROR: sync-code-error ;
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ENUM: flac-channel-assignment
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channel-assignment-independent
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channel-assignment-left-side
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channel-assignment-right-side
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channel-assignment-mid-side ;
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ENUM: flac-frame-number-type
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frame-number-type-frame
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frame-number-type-sample ;
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ENUM: flac-subframe-type
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subframe-type-constant
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subframe-type-verbatim
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subframe-type-fixed
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subframe-type-lpc ;
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ENUM: flac-entropy-coding-method
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entropy-coding-partioned-rice
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entropy-coding-partioned-rice2 ;
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TUPLE: subframe
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{ type maybe{ subframe-type-constant
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subframe-type-verbatim
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subframe-type-fixed
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subframe-type-lpc } } ;
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TUPLE: frame-header
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{ blocksize integer }
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{ sample-rate integer }
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{ channels integer }
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{ channel-assignment maybe{ channel-assignment-independent
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channel-assignment-left-side
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channel-assignment-right-side
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channel-assignment-mid-side } }
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{ bits-per-sample integer }
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{ number-type maybe{ frame-number-type-frame frame-number-type-sample } }
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{ number integer }
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{ crc integer } ;
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TUPLE: frame-footer
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{ crc integer } ;
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:: read-sync-code ( bitstream -- ? )
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14 bitstream read-bit sync-code = ;
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:: (decode-frame-header) ( bitstream -- )
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[
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bitstream read-sync-code [ sync-code-error ] unless
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1 bitstream read-bit drop
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1 bitstream read-bit drop
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4 bitstream read-bit integer>bit-array .
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4 bitstream read-bit integer>bit-array .
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] with-big-endian ;
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: decode-frame-header ( -- )
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[
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3 read bitstreams:<msb0-bit-reader> (decode-frame-header)
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] with-big-endian ;
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: decode-file ( filename -- )
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binary
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[
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read-flac-magic [ not-a-flac-file ] unless
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read-stream-info drop
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skip-metadata
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decode-frame-header
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] with-file-reader ;
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! Copyright (C) 2020 .
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! See http://factorcode.org/license.txt for BSD license.
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USING: help.markup help.syntax ;
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IN: flac
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ARTICLE: "flac" "flac"
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{ $vocab-link "flac" }
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;
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ABOUT: "flac"
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! Copyright (C) 2020 .
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! See http://factorcode.org/license.txt for BSD license.
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USING: tools.test flac ;
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IN: flac.tests
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! Copyright (C) 2020 .
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! See http://factorcode.org/license.txt for BSD license.
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USING: ;
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IN: flac
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! Copyright (C) 2020 .
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! See http://factorcode.org/license.txt for BSD license.
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USING: endian sequences kernel classes.struct io io.binary io.files io.encodings io.encodings.string io.encodings.utf8 io.encodings.binary alien.c-types alien.endian math locals accessors prettyprint combinators pack math.parser strings arrays io.streams.byte-array sequences.generalizations assocs splitting byte-arrays alien.syntax alien.enums io.encodings.ascii ;
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QUALIFIED: bitstreams
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IN: flac.metadata
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ALIAS: read-bit bitstreams:read
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CONSTANT: FLAC-MAGIC "fLaC"
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ENUM: metadata-type
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metadata-stream-info
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metadata-padding
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metadata-application
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metadata-seek-table
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metadata-vorbis-comment
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metadata-cuesheet
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metadata-picture
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{ metadata-invalid 127 } ;
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ERROR: not-a-flac-file ;
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ERROR: cuesheet-index-reserved-must-be-zero ;
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TUPLE: metadata-block-header
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{ last? boolean }
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{ type maybe{ metadata-stream-info
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metadata-padding
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metadata-application
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metadata-seek-table
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metadata-vorbis-comment
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metadata-cuesheet
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metadata-picture
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metadata-invalid } }
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{ length integer } ;
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TUPLE: stream-info
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{ min-block-size integer }
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{ max-block-size integer }
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{ min-frame-size integer }
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{ max-frame-size integer }
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{ sample-rate integer }
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{ channels integer }
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{ bits-per-sample integer }
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{ samples integer }
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{ md5 string } ;
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TUPLE: seek-table
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{ seek-points array } ;
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TUPLE: seek-point
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{ sample-number integer }
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{ offset integer }
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{ total-samples } ;
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TUPLE: vorbis-comment
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{ vendor-string string }
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{ comments assoc } ;
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TUPLE: padding
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{ length integer } ;
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TUPLE: application
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{ id string }
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{ data byte-array } ;
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ENUM: cuesheet-track-type audio non-audio ;
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TUPLE: cuesheet-track
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{ offset integer }
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{ number number }
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{ isrc string }
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{ type integer }
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{ pre-emphasis boolean }
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{ indices array } ;
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TUPLE: cuesheet-index
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{ offset integer }
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{ number integer } ;
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TUPLE: cuesheet
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{ catalog-number integer }
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{ lead-in integer }
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{ cd? boolean }
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{ tracks array } ;
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ENUM: picture-type
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other
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file-icon
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other-file-icon
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front-cover
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back-cover
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leaflet-page
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media
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lead-artist/performer/soloist
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artist/performer
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conductor
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band/orchestra
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composer
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lyricist/text-writer
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recording-location
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during-recording
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during-performance
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movie/video-screen-capture
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bright-coloured-fish
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illustration
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badn/artist-logotype
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publisher/studio-logotype ;
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TUPLE: picture
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type
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{ mime-type string }
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{ description string }
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{ width integer }
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{ height integer }
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{ depth integer }
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{ colors integer }
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{ data byte-array } ;
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TUPLE: metadata
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{ stream-info stream-info }
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{ padding maybe{ padding } }
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{ application maybe{ application } }
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{ seek-table maybe{ seek-table } }
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{ vorbis-comment maybe{ vorbis-comment } }
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{ cuesheet maybe{ cuesheet } }
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{ picture maybe{ picture } } ;
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<PRIVATE
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: read-flac-magic ( -- magic )
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4 read utf8 decode FLAC-MAGIC = ;
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:: (parse-metadata-block-header) ( bitstream -- header )
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[
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1 bitstream read-bit 1 =
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7 bitstream read-bit <metadata-type>
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24 bitstream read-bit
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] with-big-endian
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metadata-block-header boa ;
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: parse-metadata-block-header ( byte-array -- header )
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bitstreams:<msb0-bit-reader> (parse-metadata-block-header) ;
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: read-metadata-block-header ( -- header )
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4 read parse-metadata-block-header dup . ;
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:: (parse-stream-info) ( bitstream -- stream-info )
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[
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16 bitstream read-bit
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16 bitstream read-bit
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24 bitstream read-bit
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24 bitstream read-bit
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20 bitstream read-bit
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3 bitstream read-bit 1 +
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5 bitstream read-bit 1 +
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36 bitstream read-bit
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128 bitstream read-bit u128>byte-array bytes>hex-string
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] with-big-endian
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stream-info boa ;
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: parse-stream-info ( byte-array -- stream-info )
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bitstreams:<msb0-bit-reader> (parse-stream-info) ;
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: parse-seek-table ( byte-array -- seek-table )
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dup
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binary
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[
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length 18 / <iota>
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[ drop 8 read be> 8 read be> 2 read be> seek-point boa ] map
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] with-byte-reader
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seek-table boa ;
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: parse-vorbis-comment ( byte-array -- comments )
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binary
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[
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4 read le> read utf8 decode
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4 read le> <iota> [
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drop
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4 read le> read utf8 decode
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"=" split
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] map
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] with-byte-reader >alist vorbis-comment boa ;
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: parse-padding ( byte-array -- padding )
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length padding boa ;
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: parse-application ( byte-array -- application )
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drop application new ;
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: parse-cuesheet ( byte-array -- cuesheet )
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binary
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[
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128 read ascii decode
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8 read be>
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259 read drop f
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1 read be> <iota> [
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drop
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8 read be>
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1 read be>
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12 read ascii decode
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21 read drop 0 <cuesheet-track-type> t
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1 read <iota> [
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drop
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8 read be>
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1 read be>
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3 read be> = 0 [ cuesheet-index-reserved-must-be-zero ] unless
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cuesheet-index boa
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] map
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cuesheet-track boa
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] map
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] with-byte-reader cuesheet boa ;
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: parse-picture ( byte-array -- picture )
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binary
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[
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4 read be> <picture-type>
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4 read be> read utf8 decode
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4 read be> read utf8 decode
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4 read be>
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4 read be>
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4 read be>
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4 read be>
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4 read be> read
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] with-byte-reader picture boa ;
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: read-metadata-block ( metadata byte-array type -- metadata )
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{
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{ metadata-stream-info [ parse-stream-info >>stream-info ] }
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{ metadata-padding [ parse-padding >>padding ] }
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{ metadata-application [ parse-application >>application ] }
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{ metadata-seek-table [ parse-seek-table >>seek-table ] }
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{ metadata-vorbis-comment [ parse-vorbis-comment >>vorbis-comment ] }
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{ metadata-cuesheet [ parse-cuesheet >>cuesheet ] }
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{ metadata-picture [ parse-picture >>picture ] }
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} case ;
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PRIVATE>
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: read-stream-info ( -- stream-info )
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read-metadata-block-header
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length>> read bitstreams:<msb0-bit-reader> parse-stream-info ;
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: skip-metadata ( -- )
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[
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read-metadata-block-header
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[ length>> read drop ] [ last?>> not ] bi
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] loop ;
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! TODO: handle other formats gracefully such as ID3
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: read-metadata ( filename -- metadata )
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binary
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[
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read-flac-magic [ not-a-flac-file ] unless
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metadata new
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[
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read-metadata-block-header
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[ length>> read ] [ type>> ] [ last?>> not ] tri
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[ read-metadata-block ] dip
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] loop
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] with-file-reader ;
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: <flac-metadata> ( filename -- metadata )
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read-metadata ;
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:: write-something ( bitstream -- header )
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1 1 bitstream bitstreams:poke
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1 7 bitstream bitstreams:poke
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34 24 bitstream bitstreams:poke
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bitstream bitstreams:bit-writer-bytes ;
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@ -0,0 +1 @@
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flac
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@ -0,0 +1 @@
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flac audio
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