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NAME

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SDL::Mixer::Channels -- SDL::Mixer channel functions and bindings

CATEGORY

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Mixer

DESCRIPTION

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METHODS

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allocate_channels

 my $ret = SDL::Mixer::Channels::allocate_channels( $number_of_channels );

Dynamically change the number of channels managed by the mixer. If decreasing the number of channels, the upper channels arestopped. This function returns the new number of allocated channels.

Example

 use SDL::Mixer::Channels;

 printf("We got %d channels!\n", SDL::Mixer::Channels::allocate_channels( 8 ) );

volume

 my $prev_volume = SDL::Mixer::Channels::volume( $channel_number, $volume );

volume changes the volume of the channel specified in channel by the amount set in volume. The range of volume is from 0 to MIX_MAX_VOLUME which is 128. Passing -1 to channel will change the volume of all channels. If the specified volume is -1, it will just return the current volume.

Returns the previously set volume of the channel.

play_channel

 my $channel_number = SDL::Mixer::Channels::play_channel( $channel, $chunk, $loops );

play_channel will play the specified chunk over the specified channel. SDL_mixer will choose a channel for you if you pass -1 for channel.

The chunk will be looped loops times, the total number of times played will be loops+1. Passing -1 will loop the chunk infinitely.

Returns the channel the chunk will be played on, or -1 on error.

Example:

 use SDL::Mixer;
 use SDL::Mixer::Channels;
 use SDL::Mixer::Samples;

 SDL::init(SDL_INIT_AUDIO);
 SDL::Mixer::open_audio( 44100, SDL::Constants::AUDIO_S16, 2, 4096 );

 my $chunk = SDL::Mixer::Samples::load_WAV('sample.wav');

 SDL::Mixer::Channels::play_channel( -1, $chunk, -1 );

 SDL::delay(1000);
 SDL::Mixer::close_audio();

play_channel_timed

 my $channel = SDL::Mixer::Channels::play_channel_timed( $channel, $chunk, $loops, $ticks );

Same as play_channel but you can specify the time it will play by $ticks.

fade_in_channel

 my $channel = SDL::Mixer::Channels::fade_in_channel( $channel, $chunk, $loops, $ms );

Same as play_channel but you can specify the fade-in time by $ms.

fade_in_channel_timed

 my $channel = SDL::Mixer::Channels::fade_in_channel_timed( $channel, $chunk, $loops, $ms, $ticks );

Same as fade_in_channel but you can specify the time how long the chunk will be played by $ticks.

pause

 SDL::Mixer::Channels::pause( $channel );

Pauses the given channel or all by passing -1.

resume

 SDL::Mixer::Channels::resume( $channel );

Resumes the given channel or all by passing -1.

halt_channel

 SDL::Mixer::Channels::halt_channel( $channel );

Stops the given channel or all by passing -1.

expire_channel

 my $channels = SDL::Mixer::Channels::expire_channel( $channel, $ticks );

Stops the given channel (or -1 for all) after the time specified by $ticks (in milliseconds).

Returns the number of affected channels.

fade_out_channel

 my $fading_channels = SDL::Mixer::Channels::fade_out_channel( $which, $ms );

fade_out_channel fades out a channel specified in which with a duration specified in ms in milliseconds.

Returns the the number of channels that will be faded out.

channel_finished

 SDL::Mixer::Channels::channel_finished( $callback );

Add your own callback when a channel has finished playing. NULL to disable callback. The callback may be called from the mixer's audio callback or it could be called as a result of halt_channel, etc. do not call lock_audio from this callback; you will either be inside the audio callback, or SDL_mixer will explicitly lock the audio before calling your callback.

Example 1:

 my $callback = sub{ printf("[channel_finished] callback called for channel %d\n", shift); };

 SDL::Mixer::Channels::channel_finished( $callback );

Example 2:

 sub callback
 {
     ...
 }

 SDL::Mixer::Channels::channel_finished( \&callback );

playing

 my $playing = SDL::Mixer::Channels::playing( $channel );

Returns 1 if the given channel is playing sound, otherwise 0. It does'nt check if the channel is paused.

Note: If you pass -1 you will get the number of playing channels.

paused

 my $paused = SDL::Mixer::Channels::paused( $channel );

Returns 1 if the given channel is paused, otherwise 0.

Note: If you pass -1 you will get the number of paused channels.

fading_channel

 my $fading_channel = SDL::Mixer::Channels::fading_channel( $channel );

Returns one of the following for the given channel:

  • MIX_NO_FADING
  • MIX_FADING_OUT
  • MIX_FADING_IN

Note: Never pass -1 to this function!

get_chunk

 my $chunk = SDL::Mixer::Channels::get_chunk( $channel );

get_chunk gets the most recent sample chunk played on channel. This chunk may be currently playing, or just the last used.

Note: Never pass -1 to this function!

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