loopwave.pl

#!/usr/bin/env perl

use SDL;
use SDL::Event;
use Carp;

Carp::confess "Could not initialize SDL: ", SDL::GetError()
if ( 0 > SDL::Init(SDL_INIT_AUDIO) );

$ARGV[0] ||= 'data/sample.wav';

Carp::confess "usage: $0 [wavefile]\n"
if ( in $ARGV[0], qw/ -h --help -? / );

my ( $wav_spec, $wav_buffer, $wav_len, $wav_pos ) = ( 0, 0, 0, 0 );

my$done = 0;

$fillerup = sub {
my ( $data, $len ) = @_;

$wav_ptr = $wav_buffer + $wav_pos;
$wav_remainder = $wav_len - $wav_pos;

while ( $wav_remainder <= $len ) {
 SDL::MixAudio( $data, $wav_ptr, $wav_remainder, SDL_MIX_MAXVOLUME );
$data += $wav_remainder;
$len -= $wav_remainder;
$wav_ptr = $wav_buffer;
$wav_remainder = $wav_len;
$wav_pos = 0;
 }
 SDL::MixAudio( $data, $wav_ptr, $len, SDL_MIX_MAXVOLUME );
$wav_pos += $len;
};

$poked = sub {
$done = 1;
};

$SIG{HUP} = $poked;
$SIG{INT} = $poked;
$SIG{QUIT} = $poked;
$SIG{TERM} = $poked;

$spec = SDL::NewAudioSpec( 44100, AUDIO_S16, 2, 4096 );

$wave = SDL::LoadWAV( $ARGV[0], $spec );

( $wav_spec, $wav_buffer, $wav_len ) = @$wave;

Carp::confess "Could not load wav file $ARGV[0], ", SDL::GetError(), "\n"
unless ($wav_len);

Carp::confess "Could not open audio ", SDL::GetError()
if ( 0 > SDL::OpenAudio( $wav_spec, $fillerup ) );

SDL::PauseAudio(0);

print"Using audio driver: ", SDL::AudioDriverName(), "\n";

while ( !$done && ( SDL::GetAudioStatus() == SDL_AUDIO_PLAYING ) ) {
 SDL::Delay(1000);
}