SDL::Mixer - Sound and music functions
Mixer
SDL::Mixer allows you to enable sound, alter music volume settings, and lets you play, pause and resume, as well as fading the sound and music in and out.
my $init_flags = SDL::Mixer::init( $flags );
Loads dynamic libraries and prepares them for use. Flags should be one or more flags from init flags OR'd together. It returns the flags successfully initialized, or 0 on failure.
Example:
use SDL::Mixer; my $init_flags = SDL::Mixer::init( MIX_INIT_MP3 | MIX_INIT_MOD | MIX_INIT_FLAC | MIX_INIT_OGG ); print("We have MP3 support!\n") if $init_flags & MIX_INIT_MP3; print("We have MOD support!\n") if $init_flags & MIX_INIT_MOD; print("We have FLAC support!\n") if $init_flags & MIX_INIT_FLAC; print("We have OGG support!\n") if $init_flags & MIX_INIT_OGG;
Flags:
Note: Only available for SDL_mixer >= 1.2.10
SDL::Mixer::quit();
This function unloads the liraries previously loaded with init().
Note: Only available for SDL_mixer >= 1.2.10
$version = SDL::Mixer::linked_version();
linked_version
gives you the major-, minor-, and patchlevel for SDL_mixer. This way you can check if e.g. init() and quit()
are available.
Example:
use SDL::Mixer; use SDL::Version; my $version = SDL::Mixer::linked_version(); printf("%d.%d.%d\n", $version->major, $version->minor, $version->patch); # prints "1.2.8" for me
my $audio_opened = SDL::Mixer::open_audio( $frequency, $format, $channels, $chunksize );
open_audio
will initialize SDL_mixer if it is not yet initialized, see note. SDL_mixer may not be able to provide the exact specifications
your provided, however it will automatically translate between the expected format and the real one. You can retrieve the real format using
query_spec.
Returns 0 on success, -1 on error.
Note: You must not use AUDIO_S16
, AUDIO_U16
, AUDIO_S16LSB
, or AUDIO_U16LSB.
They are not portable, and SDL will not return an
error code when they fail. The result will be a horrible staticy noise. You can usually use AUDIO_S16SYS
, though not always. Future versions
of SDL should take this parameter only as a hint, then read back the value that the OS (for example, OSS or ALSA) has chosen to use in case the
desired audio type is not supported.
Note: When already initialized, this function will not re-initialize SDL_mixer, nor fail. It will merely increment the number of times SDL::Mixer::close_audio must be called to actually get it to uninitialize. This serves as a very simplistic method for multiple application components to use SDL_mixer without necessitating a great deal of inter-component awareness. Be warned however that in such a situation, the latest components to initialize SDL_mixer will probably not get the SDL_mixer settings they're expecting.
Example:
use SDL; use SDL::Mixer; printf("Error initializing SDL_mixer: %s\n", SDL::get_error()) unless SDL::Mixer::open_audio(44100, AUDIO_S16, 2, 1024) == 0;
SDL::Mixer::close_audio();
Close the mixer and halting all playing audio. This function does not return anything.
my @query_spec = @{ SDL::Mixer::query_spec() };
Find out what the actual audio device parameters are. This function returns 1 as first array element (status) if the audio has been opened, 0 otherwise.
Example:
use SDL::Mixer; my ($status, $freq, $format, $channels) = @{ SDL::Mixer::query_spec() }; printf("%s, %s, %s, %s\n", $status, $freq, $format, $channels);
Tobias Leich [FROGGS]