audio - How to play a song on repeat in Racket/gui? -


i'm making slideshow using racket , want short song play on loop behind slide show. i'm using (play-sound) racket crashes segfault towards end of song, @ different slide. if run show without sound code not segfault.

i think song ending causing racket/gui crash , looping might prevent this. playing song in main function of show such 

(define (run)  (play-sound "path" #t)  (slide (...)  (run))

causes song continuously cut out, playing first 2 seconds or before repeating. have play-sound line outside of main function, crash towards end, @ end. i've tried increasing drracket's memory didn't help. advice appreciated.

you might interested in rsound package (cf. http://pkgs.racket-lang.org). package have both advantages , disadvantages on current approach. obvious disadvantage will require convert song wav. here's code:

#lang racket  (require rsound)  (define ishmael (rs-read "/users/clements/desktop/call-me-ishmael.wav"))  (define lead-time (* 1/10 44100))  (define (play-forever sound)   (define p (make-pstream))   (define len (rs-frames sound))   (let loop ([t 0])     (pstream-queue p sound (+ t lead-time))     (define next-t (+ t len))     (sleep (* 1/44100 (- next-t (pstream-current-frame p))))     (loop next-t)))  (play-forever ishmael)

Comments

Post a Comment

Popular posts from this blog

shopping cart - Page redirect not working PHP -

im trying redirect user when click "empty cart". redirect working "add cart" not "empty cart". ideas great. in main .php file set current url seen $current_url = base64_encode("http://$_server[http_host]$_server[request_uri]"); then below cartaction.php file handles actions such "add cart" , "empty cart" <?php session_start(); include_once 'config.php'; //add item in shopping cart if(isset($_post["add"])) { $product_id = $_post["product_id"]; //product id $return_url = base64_decode($_post["return_url"]); //return url $qty = $_post["qty"]; $product = $mysqli->query("select product_name, unit_price, unit_quantity products product_id = '$product_id'"); $obj = $product->fetch_object(); if(!isset($_session['products'])) { $_session['products'] = array(); } if(array_key_exists($product_id...
Read more

php - How to modify a menu to show sub-menus -

i have custom php menu made person, displays categories menu. however, need display subcategories well. tried adding hierarchical parameter didn't work. hoping assistance! here code: <ul> <?php /* categories wp e-commerce products */ $wpec_product_categories = get_terms( 'wpsc_product_category', 'hide_empty=0&parent=0&exclude=298'); $myarray = array(); foreach($wpec_product_categories $wpec_categories){ $myarray[$wpec_categories->term_id]['name'] = $wpec_categories->name; $myarray[$wpec_categories->term_id]['slug'] = $wpec_categories->slug; $myarray[$wpec_categories->term_id]['term_id'] = $wpec_categories->term_id; } foreach($myarray $wpec_categories1){ $wpec_term_name = $wpec_categories1['name']; $wpec_term_slug = $wpec_categories1['slug']; $wpec_term_id = $wpec_categories1['term_id']; echo '<li> <a href="'.get_page_link(19)....
Read more

python - Installing PyDev in eclipse is failed -

unable read repository @ http://pydev.sf.net/updates/content.xml. sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target i installing pydev in eclipse using python, doesn't install successfully. gives above error. happened? how solve error? i had error when trying install on laptop behind corporate firewall. couldn't tell setup of firewall, not sure of root cause. i got passed error installing pydev eclipse when out behind firewall. another way got around have eclipse on non-firewalled machine, install pydev eclipse, , copy whole eclipse directory non-firewalled machine firewalled machine. there better way, , way fix properly, didn't have time work out firewall doing. this on windows 7 machine (yeah know) not work *nix versions installed through package manager yum or apt.
Read more