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<a name="Sound"></a>
<div class="header">
<p>
Next: <a href="Fonts.html#Fonts" accesskey="n" rel="next">Fonts</a>, Previous: <a href="Images.html#Images" accesskey="p" rel="prev">Images</a>, Up: <a href="API-Reference.html#API-Reference" accesskey="u" rel="up">API Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Sound-1"></a>
<h3 class="section">3.9 Sound</h3>

<div class="example">
<pre class="example">(use-modules (sdl2 mixer))
</pre></div>

<dl>
<dt><a name="index-_0025default_002dfrequency"></a>Scheme Variable: <strong>%default-frequency</strong></dt>
</dl>

<dl>
<dt><a name="index-_0025default_002dformat"></a>Scheme Variable: <strong>%default-format</strong></dt>
</dl>

<dl>
<dt><a name="index-_0025default_002dchunk_002dsize"></a>Scheme Variable: <strong>%default-chunk-size</strong></dt>
</dl>

<dl>
<dt><a name="index-mixer_002dinit"></a>Procedure: <strong>mixer-init</strong> <em>[#:optional formats='(flac mod modplug mp3 ogg fluidsynth)]</em></dt>
<dd><p>Initialize mixer library with support for <var>formats</var>, a list of
symbols representing audio file formats.  Possible formats are:
</p>
<ul>
<li> flac
</li><li> mod
</li><li> modplug
</li><li> mp3
</li><li> ogg
</li><li> fluidsynth
</li></ul>
</dd></dl>

<dl>
<dt><a name="index-mixer_002dquit"></a>Procedure: <strong>mixer-quit</strong></dt>
<dd><p>Shutdown mixer library.
</p></dd></dl>

<dl>
<dt><a name="index-open_002daudio"></a>Procedure: <strong>open-audio</strong> <em>[#:frequency=%default-frequency]                                      [#:format=%default-format]                                      [#:stereo?=#t]                                      [#:chunk-size=%default-chunk-size]</em></dt>
<dd><p>Initialize the mixer API.  <var>frequency</var> specificies the sample rate in
hertz.  When <var>stereo?</var> is <code>#t</code>, two output channels are used, otherwise
mono output is used instead.  <var>chunk-size</var> specifies the number of bytes
used per output sample.  <var>format</var> is a symbol that specifies the output
sample format.  Possible values are:
</p>
<ul>
<li> u8
</li><li> s8
</li><li> u16lsb
</li><li> s16lsb
</li><li> u16msb
</li><li> s16msb
</li><li> u16
</li><li> s16
</li><li> s32lsb
</li><li> s32msb
</li><li> s32
</li><li> f32lsb
</li><li> f32msb
</li><li> f32
</li></ul>
</dd></dl>

<dl>
<dt><a name="index-close_002daudio"></a>Procedure: <strong>close-audio</strong></dt>
<dd><p>Shut down the mixer API.
</p></dd></dl>

<dl>
<dt><a name="index-chunk_003f"></a>Procedure: <strong>chunk?</strong> <em>c</em></dt>
<dd><p>Return <code>#t</code> if <var>c</var> is a chunk.
</p></dd></dl>

<dl>
<dt><a name="index-load_002dchunk"></a>Procedure: <strong>load-chunk</strong> <em>file</em></dt>
<dd><p>Load the audio data in <var>file</var> and return an audio chunk.
</p></dd></dl>

<dl>
<dt><a name="index-delete_002dchunk_0021"></a>Procedure: <strong>delete-chunk!</strong> <em>chunk</em></dt>
<dd><p>Free the memory used for <var>chunk</var>.
</p></dd></dl>

<dl>
<dt><a name="index-set_002dchunk_002dvolume_0021"></a>Procedure: <strong>set-chunk-volume!</strong> <em>chunk volume</em></dt>
<dd><p>Set the loudness of <var>chunk</var> to <var>volume</var>, an integer in the range
[0,128].  Return the previous chunk volume setting.
</p></dd></dl>

<dl>
<dt><a name="index-play_002dchunk_0021"></a>Procedure: <strong>play-chunk!</strong> <em>chunk                                       [#:loops=0]                                       [#:channel]</em></dt>
<dd><p>Play <var>chunk</var> on <var>channel</var>, an integer channel identifier or <code>#f</code>
to use the first unreserved audio channel.  <var>chunk</var> will play <var>loops</var> +
1 times.  Return the channel identifier that <var>chunk</var> is played on.
</p></dd></dl>

<dl>
<dt><a name="index-set_002dchannel_002dvolume_0021"></a>Procedure: <strong>set-channel-volume!</strong> <em>channel volume</em></dt>
<dd><p>Set the loudness of <var>channel</var>, an integer channel identifier or <code>#f</code>
for all channels, to <var>volume</var>, an integer in the range [0,128].  Return
the previous volume of <var>channel</var>, or the average of all channels if
<var>channel</var> is <code>#f</code>.
</p></dd></dl>

<dl>
<dt><a name="index-pause_002dchannel_0021"></a>Procedure: <strong>pause-channel!</strong> <em>channel</em></dt>
<dd><p>Pause playback on <var>channel</var>, an integer channel identifier, or <code>#f</code> to
pause all channels.
</p></dd></dl>

<dl>
<dt><a name="index-resume_002dchannel_0021"></a>Procedure: <strong>resume-channel!</strong> <em>channel</em></dt>
<dd><p>Resume playback on <var>channel</var>, an integer channel identifier, or <code>#f</code> to
resume all channels.
</p></dd></dl>

<dl>
<dt><a name="index-stop_002dchannel_0021"></a>Procedure: <strong>stop-channel!</strong> <em>channel</em></dt>
<dd><p>Halt playback on <var>channel</var>, an integer channel identifier, or <code>#f</code> to
halt all channels.
</p></dd></dl>

<dl>
<dt><a name="index-channel_002dplaying_003f"></a>Procedure: <strong>channel-playing?</strong> <em>channel</em></dt>
<dd><p>Return <code>#t</code> if <var>channel</var> is playing.
</p></dd></dl>

<dl>
<dt><a name="index-playing_002dchannels_002dcount"></a>Procedure: <strong>playing-channels-count</strong></dt>
<dd><p>Return the number of channels currently playing.
</p></dd></dl>

<dl>
<dt><a name="index-channel_002dpaused_003f"></a>Procedure: <strong>channel-paused?</strong> <em>channel</em></dt>
<dd><p>Return <code>#t</code> if <var>channel</var> is paused.
</p></dd></dl>

<dl>
<dt><a name="index-paused_002dchannels_002dcount"></a>Procedure: <strong>paused-channels-count</strong></dt>
<dd><p>Return the number of channels that are paused.
</p></dd></dl>

<dl>
<dt><a name="index-music_003f"></a>Procedure: <strong>music?</strong> <em>m</em></dt>
<dd><p>Return <code>#t</code> if <var>m</var> is music.
</p></dd></dl>

<dl>
<dt><a name="index-load_002dmusic"></a>Procedure: <strong>load-music</strong> <em>file</em></dt>
<dd><p>Load music from <var>file</var>.
</p></dd></dl>

<dl>
<dt><a name="index-delete_002dmusic_0021"></a>Procedure: <strong>delete-music!</strong> <em>music</em></dt>
<dd><p>Delete the memory used for <var>music</var>.
</p></dd></dl>

<dl>
<dt><a name="index-play_002dmusic_0021"></a>Procedure: <strong>play-music!</strong> <em>music [#:optional loops=1]</em></dt>
<dd><p>Play <var>music</var>, repeated <var>loops</var> times.  <var>loops</var> may be <code>#f</code>, in
which case the music loops indefinitely.
</p></dd></dl>

<dl>
<dt><a name="index-set_002dmusic_002dvolume_0021"></a>Procedure: <strong>set-music-volume!</strong> <em>volume</em></dt>
<dd><p>Set music loudness to <var>volume</var>, an integer in the range [0,128].  Return the
previous volume.
</p></dd></dl>

<dl>
<dt><a name="index-music_002dvolume"></a>Procedure: <strong>music-volume</strong></dt>
<dd><p>Return the music volume.
</p></dd></dl>

<dl>
<dt><a name="index-pause_002dmusic_0021"></a>Procedure: <strong>pause-music!</strong></dt>
<dd><p>Puase the music.
</p></dd></dl>

<dl>
<dt><a name="index-resume_002dmusic_0021"></a>Procedure: <strong>resume-music!</strong></dt>
<dd><p>Resume music playback.
</p></dd></dl>

<dl>
<dt><a name="index-rewind_002dmusic_0021"></a>Procedure: <strong>rewind-music!</strong></dt>
<dd><p>Start music playback from the beginning.  Rewinding is only supported for MOD,
OGG, MP3, and native MIDI music.
</p></dd></dl>

<dl>
<dt><a name="index-stop_002dmusic_0021"></a>Procedure: <strong>stop-music!</strong></dt>
<dd><p>Halt music playback.
</p></dd></dl>

<dl>
<dt><a name="index-music_002dplaying_003f"></a>Procedure: <strong>music-playing?</strong></dt>
<dd><p>Return <code>#t</code> if music is currently playing.
</p></dd></dl>

<dl>
<dt><a name="index-music_002dpaused_003f"></a>Procedure: <strong>music-paused?</strong></dt>
<dd><p>Return <code>#t</code> if music is currently paused.
</p></dd></dl>

<hr>
<div class="header">
<p>
Next: <a href="Fonts.html#Fonts" accesskey="n" rel="next">Fonts</a>, Previous: <a href="Images.html#Images" accesskey="p" rel="prev">Images</a>, Up: <a href="API-Reference.html#API-Reference" accesskey="u" rel="up">API Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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