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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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</table>
<div class="refentry" title="IpatchUnit_DLS">
<a name="libinstpatch-IpatchUnit-DLS"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libinstpatch-IpatchUnit-DLS.top_of_page"></a>IpatchUnit_DLS</span></h2>
<p>IpatchUnit_DLS — Unit types and conversions for DLS</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" title="Stability Level">
<a name="libinstpatch-IpatchUnit-DLS.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="libinstpatch-IpatchUnit-DLS.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#define             <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#IPATCH-UNIT-DLS-ABS-TIME-0SECS--CAPS"
>IPATCH_UNIT_DLS_ABS_TIME_0SECS</a>
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-class-convert"
>ipatch_unit_dls_class_convert</a>       (<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint16"
>guint16</a> src_units,
                                                         const <a
href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"
>GValue</a> *src_val);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-percent-to-percent"
>ipatch_unit_dls_percent_to_percent</a>  (int dls_percent);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-percent-to-dls-percent"
>ipatch_unit_percent_to_dls_percent</a>  (double percent);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-gain-to-decibels"
>ipatch_unit_dls_gain_to_decibels</a>    (int dls_gain);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-decibels-to-dls-gain"
>ipatch_unit_decibels_to_dls_gain</a>    (double db);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-abs-time-to-seconds"
>ipatch_unit_dls_abs_time_to_seconds</a> (int dls_abs_time);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-seconds-to-dls-abs-time"
>ipatch_unit_seconds_to_dls_abs_time</a> (double seconds);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-rel-time-to-time-cents"
>ipatch_unit_dls_rel_time_to_time_cents</a>
                                                        (int dls_rel_time);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-time-cents-to-dls-rel-time"
>ipatch_unit_time_cents_to_dls_rel_time</a>
                                                        (double time_cents);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-abs-pitch-to-hertz"
>ipatch_unit_dls_abs_pitch_to_hertz</a>  (int dls_abs_pitch);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-hertz-to-dls-abs-pitch"
>ipatch_unit_hertz_to_dls_abs_pitch</a>  (double hertz);
double              <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-dls-rel-pitch-to-cents"
>ipatch_unit_dls_rel_pitch_to_cents</a>  (int dls_rel_pitch);
int                 <a
href="../libinstpatch/libinstpatch-IpatchUnit-DLS.html#ipatch-unit-cents-to-dls-rel-pitch"
>ipatch_unit_cents_to_dls_rel_pitch</a>  (double cents);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="libinstpatch-IpatchUnit-DLS.description"></a><h2>Description</h2>
<p>
</p>
</div>
<div class="refsect1" title="Details">
<a name="libinstpatch-IpatchUnit-DLS.details"></a><h2>Details</h2>
<div class="refsect2" title="IPATCH_UNIT_DLS_ABS_TIME_0SECS">
<a name="IPATCH-UNIT-DLS-ABS-TIME-0SECS--CAPS"></a><h3>IPATCH_UNIT_DLS_ABS_TIME_0SECS</h3>
<pre class="programlisting">#define IPATCH_UNIT_DLS_ABS_TIME_0SECS 0x80000000L
</pre>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_class_convert ()">
<a name="ipatch-unit-dls-class-convert"></a><h3>ipatch_unit_dls_class_convert ()</h3>
<pre class="programlisting">int                 ipatch_unit_dls_class_convert       (<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint16"
>guint16</a> src_units,
                                                         const <a
href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"
>GValue</a> *src_val);</pre>
<p>
Converts a value to "DLS" units.  DLS units are unit types that
are used by DLS (Downloadable Sounds) patches.  The <span class="type">IPATCH_UNIT_CLASS_DLS</span>
map is used to lookup the corresponding type to convert to.
Only some types have an associated DLS type.  It is an error to pass a
<em class="parameter"><code>src_units</code></em> type that has no DLS mapping (note that this is contrary to the
behavior of <a
href="../libinstpatch/libinstpatch-IpatchUnit.html#ipatch-unit-user-class-convert"
><code class="function">ipatch_unit_user_class_convert()</code></a>).</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_units</code></em> :</span></p></td>
<td> Source unit type ID
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_val</code></em> :</span></p></td>
<td> Source value (type should be compatible with the source unit's
  value type)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The value converted to DLS units.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_percent_to_percent ()">
<a name="ipatch-unit-dls-percent-to-percent"></a><h3>ipatch_unit_dls_percent_to_percent ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_percent_to_percent  (int dls_percent);</pre>
<p>
Convert value in DLS percent units to percent.
</p>
<p>
percent = dls_percent / (10 * 65536)</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_percent</code></em> :</span></p></td>
<td> Value in DLS percent units
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in percent
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_percent_to_dls_percent ()">
<a name="ipatch-unit-percent-to-dls-percent"></a><h3>ipatch_unit_percent_to_dls_percent ()</h3>
<pre class="programlisting">int                 ipatch_unit_percent_to_dls_percent  (double percent);</pre>
<p>
Convert percent to DLS percent.
</p>
<p>
dls_percent = percent * 10 * 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td> Value in percent
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Converted integer in DLS percent
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_gain_to_decibels ()">
<a name="ipatch-unit-dls-gain-to-decibels"></a><h3>ipatch_unit_dls_gain_to_decibels ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_gain_to_decibels    (int dls_gain);</pre>
<p>
Converts a value from DLS gain to decibels.
</p>
<p>
dls_gain = 200 * 65536 * log10 (V / v)
decibels = 20 * log10 (V / v)</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_gain</code></em> :</span></p></td>
<td> Value in DLS gain units
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to decibels
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_decibels_to_dls_gain ()">
<a name="ipatch-unit-decibels-to-dls-gain"></a><h3>ipatch_unit_decibels_to_dls_gain ()</h3>
<pre class="programlisting">int                 ipatch_unit_decibels_to_dls_gain    (double db);</pre>
<p>
Converts a value from decibels to DLS gain.
See <code class="function">ipatch_unit_dls_gain_to_decibel()</code></p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>db</code></em> :</span></p></td>
<td> Value in decibels
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS gain
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_abs_time_to_seconds ()">
<a name="ipatch-unit-dls-abs-time-to-seconds"></a><h3>ipatch_unit_dls_abs_time_to_seconds ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_abs_time_to_seconds (int dls_abs_time);</pre>
<p>
Converts a value from DLS absolute time to seconds.
seconds = 2^(dls_abs_time / (1200 * 65536))
</p>
<p>
0x80000000 is used as a 0 value.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_abs_time</code></em> :</span></p></td>
<td> Value in DLS absolute time
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to seconds
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_seconds_to_dls_abs_time ()">
<a name="ipatch-unit-seconds-to-dls-abs-time"></a><h3>ipatch_unit_seconds_to_dls_abs_time ()</h3>
<pre class="programlisting">int                 ipatch_unit_seconds_to_dls_abs_time (double seconds);</pre>
<p>
Converts a value from seconds to DLS absolute time.
dls_rel_time = 1200 * log2 (seconds) * 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>seconds</code></em> :</span></p></td>
<td> Value in seconds
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS relative time
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_rel_time_to_time_cents ()">
<a name="ipatch-unit-dls-rel-time-to-time-cents"></a><h3>ipatch_unit_dls_rel_time_to_time_cents ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_rel_time_to_time_cents
                                                        (int dls_rel_time);</pre>
<p>
Converts a value from DLS relative time to time cents.
time_cents = dls_rel_time / 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_rel_time</code></em> :</span></p></td>
<td> Value in DLS relative time
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to time cents
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_time_cents_to_dls_rel_time ()">
<a name="ipatch-unit-time-cents-to-dls-rel-time"></a><h3>ipatch_unit_time_cents_to_dls_rel_time ()</h3>
<pre class="programlisting">int                 ipatch_unit_time_cents_to_dls_rel_time
                                                        (double time_cents);</pre>
<p>
Converts a value from time_cents to DLS relative time.
dls_rel_time = time_cents * 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>time_cents</code></em> :</span></p></td>
<td> Value in time cents
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS relative time
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_abs_pitch_to_hertz ()">
<a name="ipatch-unit-dls-abs-pitch-to-hertz"></a><h3>ipatch_unit_dls_abs_pitch_to_hertz ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_abs_pitch_to_hertz  (int dls_abs_pitch);</pre>
<p>
Converts a value from DLS absolute pitch to hertz.
hertz = 440 * 2^((dls_abs_pitch / 65536 - 6900) / 1200)</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_abs_pitch</code></em> :</span></p></td>
<td> Value in DLS absolute pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to hertz
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_hertz_to_dls_abs_pitch ()">
<a name="ipatch-unit-hertz-to-dls-abs-pitch"></a><h3>ipatch_unit_hertz_to_dls_abs_pitch ()</h3>
<pre class="programlisting">int                 ipatch_unit_hertz_to_dls_abs_pitch  (double hertz);</pre>
<p>
Converts a value from hertz to DLS absolute pitch.
dls_abs_pitch = (1200 * log2(hertz/440) + 6900) * 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hertz</code></em> :</span></p></td>
<td> Value in hertz
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS absolute pitch
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_rel_pitch_to_cents ()">
<a name="ipatch-unit-dls-rel-pitch-to-cents"></a><h3>ipatch_unit_dls_rel_pitch_to_cents ()</h3>
<pre class="programlisting">double              ipatch_unit_dls_rel_pitch_to_cents  (int dls_rel_pitch);</pre>
<p>
Converts a value from DLS relative pitch to cents.
cents = dls_rel_pitch / 65536</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_rel_pitch</code></em> :</span></p></td>
<td> Value in DLS relative pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to cents
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_cents_to_dls_rel_pitch ()">
<a name="ipatch-unit-cents-to-dls-rel-pitch"></a><h3>ipatch_unit_cents_to_dls_rel_pitch ()</h3>
<pre class="programlisting">int                 ipatch_unit_cents_to_dls_rel_pitch  (double cents);</pre>
<p>
Converts a value from cents to DLS relative pitch.
dls_rel_pitch = cents * 65536</p>
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<td><p><span class="term"><em class="parameter"><code>cents</code></em> :</span></p></td>
<td> Value in cents
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS relative pitch
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