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alsa.lisp
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alsa.lisp
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;;;; alsa.lisp
(defpackage #:cl-pure-data-alsa
(:nicknames #:pda #:pure-data-alsa)
(:use #:cl)
(:export #:*alsa-device*))
(in-package #:cl-pure-data-alsa)
;; Copied from cl-mixed.
(cffi:define-foreign-library libasound
(:unix (:or "libasound.so.2.0.0" "libasound.so.2" "libasound.so"))
(T (:or (:default "libasound") (:default "asound"))))
(cffi:defcenum pcm-stream
:playback
:capture)
(cffi:defcenum pcm-format
(:unknown -1)
:int8
:uint8
:int16
:int16-be
:uint16
:uint16-be
:int24
:int24-be
:uint24
:uint24-be
:int32
:int32-be
:uint32
:uint32-be
:float
:float-be
:double
:double-be
:iec958-subframe-le
:iec958-subframe-be
:mu-law
:a-law
:ima-adpcm
:mpeg
:gsm
:special
:s24-3le
:s24-3be
:u24-3le
:u24-3be
:s20-3le
:s20-3be
:u20-3le
:u20-3be
:s18-3le
:s18-3be
:u18-3le
:u18-3be
:s16
:u16
:s24
:u24
:s32
:u32
:float32
:float64
:iec958-subframe)
(cffi:defcenum pcm-access
:mmap-interleaved
:mmap-noninterleaved
:mmap-complex
:rw-interleaved
:rw-noninterleaved)
(cffi:defcfun (pcm-open "snd_pcm_open") :int
(pcm :pointer)
(name :string)
(stream pcm-stream)
(mode :int))
(cffi:defcfun (pcm-set-params "snd_pcm_set_params") :int
(pcm :pointer)
(format pcm-format)
(access pcm-access)
(channels :uint)
(rate :uint)
(soft-resample :int)
(latency :uint))
(cffi:defcfun (pcm-start "snd_pcm_start") :int
(pcm :pointer))
(cffi:defcfun (pcm-writei "snd_pcm_writei") :long
(pcm :pointer)
(buffer :pointer)
(frames :ulong))
(cffi:defcfun (pcm-recover "snd_pcm_recover") :int
(pcm :pointer)
(err :int)
(silent :int))
(cffi:defcfun (pcm-drain "snd_pcm_drain") :int
(pcm :pointer))
(cffi:defcfun (pcm-close "snd_pcm_close") :int
(pcm :pointer))
;; cl-pure-data code.
(defvar *alsa-device* "sysdefault"
"The device to use for output.")
(defvar *alsa-out* nil
"The stream to output data for ALSA to.")
(defmethod pd:init-audio :around (ins outs sample-rate)
(prog1
(call-next-method)
(unless *alsa-out*
(cffi:load-foreign-library 'libasound)
(let ((pcm (cffi:foreign-alloc :pointer)))
(pcm-open pcm *alsa-device* :playback 0)
(setf *alsa-out* (cffi:mem-ref pcm :pointer))
(pcm-set-params
*alsa-out* :float :rw-interleaved
pd:*audio-out-channels* pd:*audio-sample-rate* 1 1000)
(pcm-start *alsa-out*)))))
(defmethod pd:process :around (in-buffer &optional (ticks 1))
(let* ((result (call-next-method))
(foreign-result (cffi:foreign-array-alloc result `(:array :float ,(length result))))
(played (pcm-writei *alsa-out* foreign-result (* pd:*audio-block-size* ticks))))
(when (< played 0)
(pcm-recover *alsa-out* played 0))
(cffi:foreign-array-free foreign-result)
result))
(defmethod pd:release :around ()
(unwind-protect
(call-next-method)
(pcm-drain *alsa-out*)
(pcm-close *alsa-out*)))