96 lines
3.2 KiB
Factor
96 lines
3.2 KiB
Factor
! Copyright (C) 2007 Adam Wendt.
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! See http://factorcode.org/license.txt for BSD license.
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USING: alien alien.c-types byte-arrays io io.binary io.files kernel mad
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namespaces prettyprint sbufs sequences tools.interpreter vars
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io.encodings.binary ;
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IN: mad.api
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VARS: buffer-start buffer-length output-callback-var ;
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: create-mad-callback-generic ( sequence parameters -- alien )
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swap >r >r "mad_flow" r> "cdecl" r> alien-callback ; inline
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: create-input-callback ( sequence -- alien )
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{ "void*" "mad_stream*" } create-mad-callback-generic ; inline
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: create-header-callback ( sequence -- alien )
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{ "void*" "mad_header*" } create-mad-callback-generic ; inline
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: create-filter-callback ( sequence -- alien )
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{ "void*" "mad_stream*" "mad_frame*" } create-mad-callback-generic ; inline
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: create-output-callback ( sequence -- alien )
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{ "void*" "mad_header*" "mad_pcm*" } create-mad-callback-generic ; inline
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: create-error-callback ( sequence -- alien )
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{ "void*" "mad_stream*" "mad_frame*" } create-mad-callback-generic ; inline
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: create-message-callback ( sequence -- alien )
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{ "void*" "void*" "uint*" } create-mad-callback-generic ; inline
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: input ( buffer mad_stream -- mad_flow )
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"input" print flush
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nip ! mad_stream
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buffer-start get ! mad_stream start
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buffer-length get ! mad_stream start length
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dup 0 = ! mad-stream start length bool
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[ 3drop MAD_FLOW_STOP ] ! mad_flow
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[ mad_stream_buffer !
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0 buffer-length set !
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MAD_FLOW_CONTINUE ] if ; ! mad_flow
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: input-callback ( -- callback )
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[ input ] create-input-callback ;
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: header-callback ( -- callback )
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[ "header" print flush drop drop MAD_FLOW_CONTINUE ] create-header-callback ;
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: filter-callback ( -- callback )
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[ "filter" print flush 3drop MAD_FLOW_CONTINUE ] create-filter-callback ;
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: write-sample ( sample -- )
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4 >le write ;
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: output ( data header pcm -- mad_flow )
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"output" . flush
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-rot 2drop output-callback-var> call
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[ MAD_FLOW_CONTINUE ] [ MAD_FLOW_STOP ] if ;
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: output-stdout ( pcm -- ? )
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[ mad_pcm-channels ] keep
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[ mad_pcm-length ] keep swap
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[
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[ mad_pcm-sample-right ] 2keep
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[ mad_pcm-sample-left ] 2keep
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drop -rot write-sample pick
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2 = [ write-sample ] [ drop ] if
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] each drop t ;
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: output-callback ( -- callback )
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[ output ] create-output-callback ;
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: error-callback ( -- callback )
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[ "error" print flush drop drop drop MAD_FLOW_CONTINUE ] create-error-callback ;
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: message-callback ( -- callback )
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[ "message" print flush drop drop drop MAD_FLOW_CONTINUE ] create-message-callback ;
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: mad-init ( decoder -- )
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0 <alien> input-callback 0 <alien> 0 <alien> output-callback error-callback message-callback mad_decoder_init ;
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: make-decoder ( -- decoder )
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"mad_decoder" malloc-object ;
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: mad-run ( -- int )
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make-decoder [ mad-init ] keep MAD_DECODER_MODE_SYNC mad_decoder_run ;
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: init-vars ( alien length -- )
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buffer-length set buffer-start set ;
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: decode-mp3 ( filename -- results )
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[ malloc-file-contents ] keep file-length init-vars mad-run ;
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: mad-test ( -- results )
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[ output-stdout ] >output-callback-var
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"/home/adam/download/mp3/Misc/wutbf.mp3" decode-mp3 ;
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