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Hans Dijkema
2026-04-14 15:07:12 +02:00
parent ea9432cc37
commit fdba3ad8f8
3 changed files with 17 additions and 3 deletions
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14
flac-decoder.rkt
View File

@@ -10,6 +10,7 @@
flac-read-meta
flac-stream-state
flac-stop
flac-seek
(all-from-out "flac-definitions.rkt")
kinds
last-buffer last-buf-len
@@ -132,6 +133,19 @@
(flac-handle-stream-info handle))
#f)))
(define (flac-seek handle percentage)
(dbg-sound "seek to percentage ~a" percentage)
(let ((ffi-handler (flac-handle-ffi-decoder-handler handle)))
(let ((total-samples (flac-total-samples handle)))
(unless (eq? total-samples #f)
(let ((sample (inexact->exact (round (* (exact->inexact (/ percentage 100.0)) total-samples)))))
(ffi-handler 'seek-to-sample sample))
)
)
)
)
(define (flac-stop handle)
(let ((ct (current-milliseconds)))
(dbg-sound "requesting stop at: ~a" ct)

2
libflac-ffi.rkt
View File

@@ -596,7 +596,7 @@
[(eq? cmd 'process-meta-data) (process-meta-data (car args))]
[(eq? cmd 'process-write-data) (process-write-data (car args))]
[(eq? cmd 'errno) error-no]
[(eq? cmd 'seek-to-sample) (seek-to-sample (car args))]
[(eq? cmd 'file) flac-file]

4
play-test.rkt
View File

@@ -57,7 +57,7 @@
(let* ((buf-size (ao-bufsize-async ao-h))
(buf-seconds (exact->inexact (/ buf-size bytes-per-sample-all-channels rate))))
(second-printer buf-seconds)
(when (> buf-seconds 5)
(when (> buf-seconds 30)
(letrec ((waiter (λ ()
(let ((buf-seconds-left (exact->inexact
(/ (ao-bufsize-async ao-h)
@@ -66,7 +66,7 @@
(if (< buf-seconds-left 2.0)
(displayln (format "Seconds in buffer left: ~a" buf-seconds-left))
(begin
(sleep 0.5)
(sleep 1)
(second-printer buf-seconds)
(waiter)))))
))