I'm using Win32::Sound::WaveOut to create some simple sound sequences. I've written the following module to smooth the interface with my application:
package SoundPlayer;
use strict;
use Win32::Sound;

my $Rate = 8000;

sub new {
    my $invocant = shift;
    my $class = ref($invocant) || $invocant;
    my $self = {player => Win32::Sound::WaveOut->new($Rate, 8, 1)};
    bless $self, $class;
    return $self
}

sub play {
    my $self = shift;
    my $player = $self->{player};
    $self->stop;
    my $silence = pack('C', 128);
    my $data = '';
    foreach (@_) {
        my ($freq, $dur) = @$_;
        $dur *= $Rate;
        if ($freq == 0) {
            $data .= $silence x ($dur)
        } else {
            foreach (0 .. $dur - 1) {
                my $v = 128 + 127 * triangle($_ * $freq / $Rate * 256)
+;
                $data .= pack('C', $v)
            }
        }
    }
    $player->Unload;
    $player->Load($data);
    $player->Write;
}

sub playBites {
    my $self = shift;
    my $tempo = shift;
    my @sequence;
    while (@_) {
        my $bite = shift;
        foreach my $note ($bite->sequence) {
            my ($freq, $dur) = @$note;
            $dur /= $tempo;
            push @sequence, [int($freq), int($dur) / 1000]
        }
    }
    $self->play(@sequence)
}    

sub done {
    my $self = shift;
    return $self->{player}->Status
}

sub stop {
    my $self = shift;
    my $player = $self->{player};
    $player->Reset;
    $player->Unload
}

#---[Functions for different waveforms]------------------------------

sub _duo {
    my $x = shift;
    return (sin($x) + 0.5 * sin(3 * $x) + 0.25 * sin(5 * $x)) / 1.75
}

sub _square {
    my $x = (int(shift) % 256);
    return $x < 128 ? -1 : 1
}

sub _triangle {
    my $x = (int(shift) % 256);
    return $x < 128 ? $x / 128 - 0.5 : (256 - $x) / 128 - 0.5
}

sub _cliptriangle {
    my $x = shift;
    my $y = _triangle($x) * 1.25;
    return $y > 1 ? 1 : $y < -1 ? -1 : $y
}

1;

[download]
It works fine, and I get the sounds I want. But I'm having a problem when long-duration sequences are followed those of shorter durations. Once the shorter sequence has finished, the remainder of the longer sequence continues playing until it has finished. Apparently the buffer is not getting cleared properly between sequences. But I'm at a loss how to remedy the situation (short of filling the ends of short sequences with silence -- a bad option). Any ideas?

In reply to Win32::Sound buffer problems by Dr. Mu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.