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<span id="Sources"></span><div class="header">
<p>
Next: <a href="The-Listener.html" accesskey="n" rel="next">The Listener</a>, Previous: <a href="Audio-Files.html" accesskey="p" rel="prev">Audio Files</a>, Up: <a href="Audio.html" accesskey="u" rel="up">Audio</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Sources-1"></span><h4 class="subsection">2.4.2 Sources</h4>
<p>While the <code>audio-play</code> procedure provides a quick and convenient
way to play audio, it has some limitations. What if the audio is a
long piece of music that might need to be paused or stopped later?
What if the audio should be looped? What if the volume or pitch needs
to be altered? For manipulating audio in these ways, a “source” is
required. Sources can be thought of like a boombox: They sit
somewhere in the room and play sound. The pause or stop buttons can
be pressed; it can be moved somewhere else; the volume knob can be
adjusted; the CD can be changed.
</p>
<p>Sources are a great fit for handling background music, among other
things. For quick, one-off sound effects, <code>audio-play</code> is a
better fit.
</p>
<dl>
<dt id="index-make_002dsource">Procedure: <strong>make-source</strong> <em>audio loop? [#:pitch 1.0] [#:volume 1.0] [#:min-volume 0.0] [#:max-volume 1.0] [#:max-distance] [#:reference-distance 0.0] [#:rolloff-factor 1.0] [#:cone-outer-volume 0.0] [#:cone-inner-angle 0.0] [#:cone-outer-angle] [#:position <code>(vec3 0.0 0.0 0.0)</code>] [#:velocity <code>(vec3 0.0 0.0 0.0)</code>] [#:direction <code>(vec3 0.0 0.0 0.0)</code>] [#:relative? <code>#f</code>]</em></dt>
<dd>
<p>Return a new audio source. <var>audio</var> is the audio data to use when
playing. <var>loop?</var> specifies whether or not to loop the audio
during playback.
</p>
<p>Refer to <code>audio-play</code> (see <a href="Audio-Files.html">Audio Files</a>) for information about
the optional keyword arguments.
</p></dd></dl>
<dl>
<dt id="index-source_003f">Procedure: <strong>source?</strong> <em>obj</em></dt>
<dd><p>Return <code>#t</code> if <var>obj</var> is an audio source object.
</p></dd></dl>
<dl>
<dt id="index-streaming_002dsource_003f">Procedure: <strong>streaming-source?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if <var>source</var> contains streaming audio.
</p></dd></dl>
<dl>
<dt id="index-static_002dsource_003f">Procedure: <strong>static-source?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if <var>source</var> contains static audio.
</p></dd></dl>
<dl>
<dt id="index-source_002dplaying_003f">Procedure: <strong>source-playing?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if <var>source</var> is currently playing.
</p></dd></dl>
<dl>
<dt id="index-source_002dpaused_003f">Procedure: <strong>source-paused?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if <var>source</var> is currently paused.
</p></dd></dl>
<dl>
<dt id="index-source_002dstopped_003f">Procedure: <strong>source-stopped?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if <var>source</var> is currently stopped.
</p></dd></dl>
<dl>
<dt id="index-source_002dpitch">Procedure: <strong>source-pitch</strong> <em>source</em></dt>
<dd><p>Return the pitch multiplier of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dvolume">Procedure: <strong>source-volume</strong> <em>source</em></dt>
<dd><p>Return the volume multiplier of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dmin_002dvolume">Procedure: <strong>source-min-volume</strong> <em>source</em></dt>
<dd><p>Return the minimum volume of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dmax_002dvolume">Procedure: <strong>source-max-volume</strong> <em>source</em></dt>
<dd><p>Return the maximum volume of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dmax_002ddistance">Procedure: <strong>source-max-distance</strong> <em>source</em></dt>
<dd><p>Return the maximum distance of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dreference_002ddistance">Procedure: <strong>source-reference-distance</strong> <em>source</em></dt>
<dd><p>Return the reference distance of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002drolloff_002dfactor">Procedure: <strong>source-rolloff-factor</strong> <em>source</em></dt>
<dd><p>Return the rolloff factor of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dcone_002douter_002dvolume">Procedure: <strong>source-cone-outer-volume</strong> <em>source</em></dt>
<dd><p>Return the volume of <var>source</var> when outside the oriented cone.
</p></dd></dl>
<dl>
<dt id="index-source_002dcone_002dinner_002dangle">Procedure: <strong>source-cone-inner-angle</strong> <em>source</em></dt>
<dd><p>Return the inner angle of the sound cone of <var>source</var> in radians.
</p></dd></dl>
<dl>
<dt id="index-source_002dcone_002douter_002dangle">Procedure: <strong>source-cone-outer-angle</strong> <em>source</em></dt>
<dd><p>Return the outer angle of the sound cone of <var>source</var> in radians.
</p></dd></dl>
<dl>
<dt id="index-source_002dposition">Procedure: <strong>source-position</strong> <em>source</em></dt>
<dd><p>Return the position of <var>source</var> as a 3D vector.
</p></dd></dl>
<dl>
<dt id="index-source_002dvelocity">Procedure: <strong>source-velocity</strong> <em>source</em></dt>
<dd><p>Return the velocity of <var>source</var> as a 3D vector.
</p></dd></dl>
<dl>
<dt id="index-source_002ddirection">Procedure: <strong>source-direction</strong> <em>source</em></dt>
<dd><p>Return the direction of <var>source</var> as a 3D vector.
</p></dd></dl>
<dl>
<dt id="index-source_002drelative_003f">Procedure: <strong>source-relative?</strong> <em>source</em></dt>
<dd><p>Return <code>#t</code> if the position of <var>source</var> is relative to the
listener’s position.
</p></dd></dl>
<dl>
<dt id="index-source_002dplay">Procedure: <strong>source-play</strong> <em>source</em></dt>
<dd><p>Begin/resume playback of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dpause">Procedure: <strong>source-pause</strong> <em>source</em></dt>
<dd><p>Pause playback of <var>source</var>.
</p></dd></dl>
<dl>
<dt id="index-source_002dtoggle">Procedure: <strong>source-toggle</strong> <em>source</em></dt>
<dd><p>Play <var>source</var> if it is currently paused or pause <var>source</var> if
it is currently playing.
</p></dd></dl>
<dl>
<dt id="index-source_002dstop">Procedure: <strong>source-stop</strong> <em>[source]</em></dt>
<dd><p>Stop playing <var>source</var> or, if no source is specified, stop playing
<em>all</em> sources.
</p></dd></dl>
<dl>
<dt id="index-source_002drewind">Procedure: <strong>source-rewind</strong> <em>source</em></dt>
<dd><p>Rewind <var>source</var> to the beginning of the audio stream.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002daudio_0021">Procedure: <strong>set-source-audio!</strong> <em>source audio</em></dt>
<dd><p>Set the playback stream for <var>source</var> to <var>audio</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dloop_0021">Procedure: <strong>set-source-loop!</strong> <em>source loop?</em></dt>
<dd><p>Configure whether or not <var>source</var> should loop the audio stream.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dpitch_0021">Procedure: <strong>set-source-pitch!</strong> <em>source pitch</em></dt>
<dd><p>Set the pitch multiplier of <var>source</var> to <var>pitch</var>
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dvolume_0021">Procedure: <strong>set-source-volume!</strong> <em>source volume</em></dt>
<dd><p>Set the volume of <var>source</var> to <var>volume</var>. A value of 1.0 is
100% volume.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dmin_002dvolume_0021">Procedure: <strong>set-source-min-volume!</strong> <em>source volume</em></dt>
<dd><p>Set the minimum volume of <var>source</var> to <var>volume</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dmax_002dvolume_0021">Procedure: <strong>set-source-max-volume!</strong> <em>source volume</em></dt>
<dd><p>Set the maximum volume of <var>source</var> to <var>volume</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dmax_002ddistance_0021">Procedure: <strong>set-source-max-distance!</strong> <em>source distance</em></dt>
<dd><p>Set the distance where there will no longer be any attenuation of
<var>source</var> to <var>distance</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dreference_002ddistance_0021">Procedure: <strong>set-source-reference-distance!</strong> <em>source distance</em></dt>
<dd><p>Set the reference distance of <var>source</var> to <var>distance</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002drolloff_002dfactor_0021">Procedure: <strong>set-source-rolloff-factor!</strong> <em>source factor</em></dt>
<dd><p>Set the rolloff factor for <var>source</var> to <var>factor</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dcone_002douter_002dvolume_0021">Procedure: <strong>set-source-cone-outer-volume!</strong> <em>source volume</em></dt>
<dd><p>Set the volume for <var>source</var> when outside the sound cone to <var>volume</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dcone_002dinner_002dangle_0021">Procedure: <strong>set-source-cone-inner-angle!</strong> <em>source angle</em></dt>
<dd><p>Set the inner angle of the sound cone of <var>source</var> to <var>angle</var> radians.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dcone_002douter_002dangle_0021">Procedure: <strong>set-source-cone-outer-angle!</strong> <em>source angle</em></dt>
<dd><p>Set the outer angle of the sound cone of <var>source</var> to <var>angle</var> radians.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dposition_0021">Procedure: <strong>set-source-position!</strong> <em>source position</em></dt>
<dd><p>Set the position of <var>source</var> to the 3D vector <var>position</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002dvelocity_0021">Procedure: <strong>set-source-velocity!</strong> <em>source velocity</em></dt>
<dd><p>Set the velocity of <var>source</var> to the 3D vector <var>velocity</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002ddirection_0021">Procedure: <strong>set-source-direction!</strong> <em>source direction</em></dt>
<dd><p>Set the velocity of <var>source</var> to the 3D vector <var>direction</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsource_002drelative_0021">Procedure: <strong>set-source-relative!</strong> <em>source relative?</em></dt>
<dd><p>If <var>relative?</var> is <code>#t</code>, the position of <var>source</var> is
interpreted as relative to the listener’s position. Otherwise, the
position of <var>source</var> is in absolute coordinates.
</p></dd></dl>
<hr>
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<p>
Next: <a href="The-Listener.html" accesskey="n" rel="next">The Listener</a>, Previous: <a href="Audio-Files.html" accesskey="p" rel="prev">Audio Files</a>, Up: <a href="Audio.html" accesskey="u" rel="up">Audio</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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