SDL::Mixer::Channels(3pm)

1SDL::Mixer::Channels(3pUms)er Contributed Perl DocumentatSiDoLn::Mixer::Channels(3pm)
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NAME

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

METHODS

13   allocate_channels
14        my $ret = SDL::Mixer::Channels::allocate_channels( $number_of_channels );
15
16       Dynamically change the number of channels managed by the mixer. If
17       decreasing the number of channels, the upper channels are stopped.
18       This function returns the new number of allocated channels.
19
20       Example
21
22        use SDL::Mixer::Channels;
23
24        printf("We got %d channels!\n", SDL::Mixer::Channels::allocate_channels( 8 ) );
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26   volume
27        my $prev_volume = SDL::Mixer::Channels::volume( $channel_number, $volume );
28
29       "volume" changes the volume of the channel specified in channel by the
30       amount set in volume. The range of volume is from 0 to "MIX_MAX_VOLUME"
31       which is 128. Passing -1 to channel will change the volume of all
32       channels. If the specified volume is -1, it will just return the
33       current volume.
34
35       Returns the previously set volume of the channel.
36
37   play_channel
38        my $channel_number = SDL::Mixer::Channels::play_channel( $channel, $chunk, $loops );
39
40       "play_channel" will play the specified "chunk" over the specified
41       "channel". SDL_mixer will choose a channel for you if you pass -1 for
42       "channel".
43
44       The chunk will be looped "loops" times, the total number of times
45       played will be "loops+1". Passing -1 will loop the chunk infinitely.
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47       Returns the channel the chunk will be played on, or -1 on error.
48
49       Example:
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51        use SDL::Mixer;
52        use SDL::Mixer::Channels;
53        use SDL::Mixer::Samples;
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55        SDL::init(SDL_INIT_AUDIO);
56        SDL::Mixer::open_audio( 44100, SDL::Constants::AUDIO_S16, 2, 4096 );
57
58        my $chunk = SDL::Mixer::Samples::load_WAV('sample.wav');
59
60        SDL::Mixer::Channels::play_channel( -1, $chunk, -1 );
61
62        SDL::delay(1000);
63        SDL::Mixer::close_audio();
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65   play_channel_timed
66        my $channel = SDL::Mixer::Channels::play_channel_timed( $channel, $chunk, $loops, $ticks );
67
68       Same as play_channel but you can specify the time it will play by
69       $ticks.
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71   fade_in_channel
72        my $channel = SDL::Mixer::Channels::fade_in_channel( $channel, $chunk, $loops, $ms );
73
74       Same as play_channel but you can specify the fade-in time by $ms.
75
76   fade_in_channel_timed
77        my $channel = SDL::Mixer::Channels::fade_in_channel_timed( $channel, $chunk, $loops, $ms, $ticks );
78
79       Same as fade_in_channel but you can specify the time how long the chunk
80       will be played by $ticks.
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82   pause
83        SDL::Mixer::Channels::pause( $channel );
84
85       Pauses the given channel or all by passing -1.
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87   resume
88        SDL::Mixer::Channels::resume( $channel );
89
90       Resumes the given channel or all by passing -1.
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92   halt_channel
93        SDL::Mixer::Channels::halt_channel( $channel );
94
95       Stops the given channel or all by passing -1.
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97   expire_channel
98        my $channels = SDL::Mixer::Channels::expire_channel( $channel, $ticks );
99
100       Stops the given channel (or -1 for all) after the time specified by
101       $ticks (in milliseconds).
102
103       Returns the number of affected channels.
104
105   fade_out_channel
106        my $fading_channels = SDL::Mixer::Channels::fade_out_channel( $which, $ms );
107
108       "fade_out_channel" fades out a channel specified in "which" with a
109       duration specified in "ms" in milliseconds.
110
111       Returns the the number of channels that will be faded out.
112
113   channel_finished
114        SDL::Mixer::Channels::channel_finished( $callback );
115
116       Add your own callback when a channel has finished playing. "NULL" to
117       disable callback. The callback may be called from the mixer's audio
118       callback or it could be called as a result of halt_channel, etc. do not
119       call "lock_audio" from this callback; you will either be inside the
120       audio callback, or SDL_mixer will explicitly lock the audio before
121       calling your callback.
122
123       Example 1:
124
125        my $callback = sub{ printf("[channel_finished] callback called for channel %d\n", shift); };
126
127        SDL::Mixer::Channels::channel_finished( $callback );
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129       Example 2:
130
131        sub callback
132        {
133            ...
134        }
135
136        SDL::Mixer::Channels::channel_finished( \&callback );
137
138   playing
139        my $playing = SDL::Mixer::Channels::playing( $channel );
140
141       Returns 1 if the given channel is playing sound, otherwise 0. It
142       doesn't check if the channel is paused.
143
144       Note: If you pass -1 you will get the number of playing channels.
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146   paused
147        my $paused = SDL::Mixer::Channels::paused( $channel );
148
149       Returns 1 if the given channel is paused, otherwise 0.
150
151       Note: If you pass -1 you will get the number of paused channels.
152
153   fading_channel
154        my $fading_channel = SDL::Mixer::Channels::fading_channel( $channel );
155
156       Returns one of the following for the given channel:
157
158       •   MIX_NO_FADING
159
160       •   MIX_FADING_OUT
161
162       •   MIX_FADING_IN
163
164       Note: Never pass -1 to this function!
165
166   get_chunk
167        my $chunk = SDL::Mixer::Channels::get_chunk( $channel );
168
169       "get_chunk" gets the most recent sample chunk played on channel. This
170       chunk may be currently playing, or just the last used.
171
172       Note: Never pass -1 to this function!
173

AUTHORS

175       See "AUTHORS" in SDL.
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179perl v5.38.0                      2023-07-21         SDL::Mixer::Channels(3pm)

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