From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Thu, 27 Apr 2023 16:02:27 +0000 (+1000)
Subject: cleanup/simplify
X-Git-Url: https://git.rrq.au/?a=commitdiff_plain;h=134b682e1b549f6abb454a042fe07c84f220355d;p=rrq%2Fnewlisp%2Falsa-dispatcher.git

cleanup/simplify
---

diff --git a/alsa-dispatcher.lsp b/alsa-dispatcher.lsp
old mode 100644
new mode 100755
index 8468a12..2948d05
--- a/alsa-dispatcher.lsp
+++ b/alsa-dispatcher.lsp
@@ -1,3 +1,5 @@
+#!/usr/bin/newlisp
+
 ;; This is the main script for the pcm-dispatch tool
 ;; last main-arg nominates the configuration file
 
@@ -66,8 +68,7 @@
  )
 
 ;; (snd_pcm_close PCM) - Close PCM handle. Closes the given PCM handle
-;; and frees all associated resources. (The PCM reference is probably
-;; "invalid" after closing)
+;; and frees all associated resources.
 (import libasound.so "snd_pcm_close" "int"
         "void*" ; snd_pcm_t *pcm
         )
@@ -105,15 +106,6 @@
         "unsigned int" ; unsigned int latency
         )
 
-;; (snd_pcm_wait PCM TIMEOUT) - Wait for a PCM to become ready.
-;; Returns a positive value on success otherwise a negative error code
-;; (-EPIPE [-32] for the xrun and -ESTRPIPE [-86] for the suspended
-;; status, others for general errors)
-(import libasound.so "snd_pcm_wait" "int"
-	"void*" ; snd_pcm_t *pcm
-        "int"   ; int timeout 
-        )
-
 ;; (snd_pcm_writei PCM BUFFER FRAMES) - Write interleaved frames to a
 ;; PCM. If the blocking behaviour is selected and the PCM is running,
 ;; then routine waits until all requested frames are played or put to
@@ -130,56 +122,50 @@
   (snd_pcm_open NAME SND_PCM_STREAM_PLAYBACK SND_PCM_MODE_BLOCK))
 
 ;; Setup PCM 
-(define (setup-pcm PCM)
+(define (setup-pcm PCM NAME)
   (snd_pcm_set_params PCM
-                      (cfg-lookup PCM "format" SND_PCM_FORMAT_S16_LE)
+                      (cfg-lookup NAME "format" SND_PCM_FORMAT_S16_LE)
                       SND_PCM_ACCESS_RW_INTERLEAVED
-                      (cfg-lookup PCM "channels" 2)
-                      (cfg-lookup PCM "rate" 48000)
+                      (cfg-lookup NAME "channels" 2)
+                      (cfg-lookup NAME "rate" 48000)
                       1 ; soft resample (0/1)
-                      (cfg-lookup PCM "latency" 100000) ; (microseconds)
+                      (cfg-lookup NAME "latency" 100000) ; (microseconds)
                       ))
 
 ;; ############################################################
 ; The main program
 
 ;; redirect stdout/err to /dev/null
-(when nil
+(when true
   (let ((REDIR (open "/dev/null" "append")))
     (when (< REDIR) (exit 1))
-    (when (< (libc:dup2 REDIR 2)) (exit 1))
-    (when (< (libc:dup2 REDIR 1)) (exit 1))
+    (when (< (dup2 REDIR 2)) (exit 1))
+    (when (< (dup2 REDIR 1)) (exit 1))
     (close REDIR)
   ))
 
 ; find the first usable PCM
-(setf PCM (unless (dolist (NAME PCM-LIST (open-pcm NAME)))
+(setf PCM (unless (dolist (N PCM-LIST (open-pcm (setf NAME N))))
             (die 1 "No PCM available")))
 
 ; configure the PCM
-(when (!= (setf E (setup-pcm PCM)))
+(when (!= (setf E (setup-pcm PCM NAME)))
   (snd_pcm_close PCM)
-  (die 1 "set params" E))
+  (die 1 "setup pcm" E))
 
 (setf N 0 x 0 E 0 i 0)
 
-(setf CACHE nil)
-(while (> (or (setf N (read 0 BUFFER 20000000)) 0))
-  ;(println "reading " N)
-  (setf CACHE BUFFER)
+(while (> (or (setf N (read 0 BUFFER 1000000)) 0))
   (while (> N) 
-    ;;(ready PCM)
-    (when (< (setf E (snd_pcm_writei PCM CACHE (/ N 4))))
+    (when (< (setf E (snd_pcm_writei PCM BUFFER (/ N 4))))
       (snd_pcm_close PCM)
       (die 1 "writing" E N))
     (setf E (* E 4))
-    (setf CACHE (E CACHE))
-    ;(println "wrote " E)
+    (setf BUFFER (E BUFFER))
     (dec N E)
     )
   )
 
-(snd_pcm_wait PCM -1)
 (snd_pcm_drain PCM)
 (snd_pcm_close PCM)
 (exit 0)