59 lines
2.2 KiB
Racket
59 lines
2.2 KiB
Racket
#lang racket/base
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(require "libao/libao.rkt"
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"libflac/flac-decoder.rkt"
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data/queue
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)
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(define test-file3 "/muziek/Klassiek-Viool/Alina Ibragimova/Paganini_24 Caprices (2021)/24. 24 Caprices, Op 1 - No. 24 in A minor- Tema con variazioni. Quasi presto.flac")
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(define fmt (ao-mk-format 24 48000 2 'big-endian))
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(define ao-h (ao-open-live #f fmt))
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(define current-seconds 0)
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(define (flac-play frame buffer)
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(let* ((sample (hash-ref frame 'number))
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(rate (hash-ref frame 'sample-rate))
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(second (/ (* sample 1.0) (* rate 1.0)))
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(bits-per-sample (hash-ref frame 'bits-per-sample))
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(bytes-per-sample (/ bits-per-sample 8))
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(channels (hash-ref frame 'channels))
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(bytes-per-sample-all-channels (* channels bytes-per-sample))
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)
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(ao-play ao-h second buffer)
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(let ((second-printer (λ ()
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(let ((s (inexact->exact (round (ao-at-second ao-h)))))
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(when (> s current-seconds)
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(set! current-seconds s)
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(displayln (format "At second: ~a" s)))))))
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(let* ((buf-size (ao-bufsize-async ao-h))
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(buf-seconds (exact->inexact (/ buf-size bytes-per-sample-all-channels rate))))
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(second-printer)
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(when (> buf-seconds 5)
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(letrec ((waiter (λ ()
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(let ((buf-seconds-left (exact->inexact
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(/ (ao-bufsize-async ao-h)
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bytes-per-sample-all-channels
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rate))))
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(if (< buf-seconds-left 2.0)
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(displayln (format "Seconds in buffer left: ~a" buf-seconds-left))
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(begin
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(sleep 0.5)
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(second-printer)
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(waiter)))))
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))
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(waiter))))
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)
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)
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)
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(define (flac-meta meta)
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(displayln meta))
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(define flac-h
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(flac-open test-file3 flac-meta flac-play))
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(flac-read flac-h)
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