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<div class="refentry" title="sample">
<a name="libinstpatch-sample"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libinstpatch-sample.top_of_page"></a>sample</span></h2>
<p>sample — Audio sample format conversion functions and defines.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" title="Stability Level">
<a name="libinstpatch-sample.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="libinstpatch-sample.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAX-TRANSFORM-FUNCS--CAPS"
>IPATCH_SAMPLE_MAX_TRANSFORM_FUNCS</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-MASK--CAPS"
>IPATCH_SAMPLE_FORMAT_MASK</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-BITCOUNT--CAPS"
>IPATCH_SAMPLE_FORMAT_BITCOUNT</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-WIDTH-MASK--CAPS"
>IPATCH_SAMPLE_WIDTH_MASK</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-CHANNEL-MASK--CAPS"
>IPATCH_SAMPLE_CHANNEL_MASK</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-SIGN-MASK--CAPS"
>IPATCH_SAMPLE_SIGN_MASK</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-ENDIAN-MASK--CAPS"
>IPATCH_SAMPLE_ENDIAN_MASK</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-WIDTH-SHIFT--CAPS"
>IPATCH_SAMPLE_WIDTH_SHIFT</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-CHANNEL-SHIFT--CAPS"
>IPATCH_SAMPLE_CHANNEL_SHIFT</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-SIGN-SHIFT--CAPS"
>IPATCH_SAMPLE_SIGN_SHIFT</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-ENDIAN-SHIFT--CAPS"
>IPATCH_SAMPLE_ENDIAN_SHIFT</a>
enum <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleWidth"
>IpatchSampleWidth</a>;
enum <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleChannel"
>IpatchSampleChannel</a>;
enum <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleChannelType"
>IpatchSampleChannelType</a>;
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAX-CHANNELS--CAPS"
>IPATCH_SAMPLE_MAX_CHANNELS</a>
enum <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleSign"
>IpatchSampleSign</a>;
enum <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleEndian"
>IpatchSampleEndian</a>;
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-ENDIAN-HOST--CAPS"
>IPATCH_SAMPLE_ENDIAN_HOST</a>
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-GET-WIDTH--CAPS"
>IPATCH_SAMPLE_FORMAT_GET_WIDTH</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-GET-CHANNELS--CAPS"
>IPATCH_SAMPLE_FORMAT_GET_CHANNELS</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-GET-CHANNEL-COUNT--CAPS"
>IPATCH_SAMPLE_FORMAT_GET_CHANNEL_COUNT</a>(format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-IS-SIGNED--CAPS"
>IPATCH_SAMPLE_FORMAT_IS_SIGNED</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-IS-UNSIGNED--CAPS"
>IPATCH_SAMPLE_FORMAT_IS_UNSIGNED</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-IS-LENDIAN--CAPS"
>IPATCH_SAMPLE_FORMAT_IS_LENDIAN</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-IS-BENDIAN--CAPS"
>IPATCH_SAMPLE_FORMAT_IS_BENDIAN</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-size"
>ipatch_sample_format_size</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-width"
>ipatch_sample_format_width</a> (format)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAP-CHANNEL--CAPS"
>IPATCH_SAMPLE_MAP_CHANNEL</a> (dest, src)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAP-GET-CHANNEL--CAPS"
>IPATCH_SAMPLE_MAP_GET_CHANNEL</a> (map, dest)
#define <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-UNITY-CHANNEL-MAP--CAPS"
>IPATCH_SAMPLE_UNITY_CHANNEL_MAP</a>
int <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-bit-width"
>ipatch_sample_format_bit_width</a> (int format);
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"
>gboolean</a> <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-verify"
>ipatch_sample_format_verify</a> (int format);
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"
>gboolean</a> <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-transform-verify"
>ipatch_sample_format_transform_verify</a>
(int src_format,
int dest_format,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"
>guint32</a> channel_map);
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-get-transform-funcs"
>ipatch_sample_get_transform_funcs</a> (int src_format,
int dest_format,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"
>guint32</a> channel_map,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> *buf1_max_frame,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> *buf2_max_frame,
<a
href="../libinstpatch/libinstpatch-IpatchSampleTransform.html#IpatchSampleTransformFunc"
>IpatchSampleTransformFunc</a> *funcs);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="libinstpatch-sample.description"></a><h2>Description</h2>
<p>
This module provides functions for converting audio formats as well as a system
for defining audio formats with a single integer composed of multiple fields
for sample width, channel count, sign and endian byte order.</p>
</div>
<div class="refsect1" title="Details">
<a name="libinstpatch-sample.details"></a><h2>Details</h2>
<div class="refsect2" title="IPATCH_SAMPLE_MAX_TRANSFORM_FUNCS">
<a name="IPATCH-SAMPLE-MAX-TRANSFORM-FUNCS--CAPS"></a><h3>IPATCH_SAMPLE_MAX_TRANSFORM_FUNCS</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_MAX_TRANSFORM_FUNCS 16
</pre>
<p>
Maximum number of transform functions returned by
<a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-get-transform-funcs"
><code class="function">ipatch_sample_get_transform_funcs()</code></a>. Is larger than current actual maximum
to allow for future backwards compatible expansion (8 is the real current
maximum).</p>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_MASK">
<a name="IPATCH-SAMPLE-FORMAT-MASK--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_MASK</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_MASK 0x1FF
</pre>
<p>
Mask for all fields of sample format integers (width, sign, endian, channel).</p>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_BITCOUNT">
<a name="IPATCH-SAMPLE-FORMAT-BITCOUNT--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_BITCOUNT</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_BITCOUNT 9
</pre>
<p>
Number of bits used for sample format integers.</p>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_WIDTH_MASK">
<a name="IPATCH-SAMPLE-WIDTH-MASK--CAPS"></a><h3>IPATCH_SAMPLE_WIDTH_MASK</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_WIDTH_MASK 0x00F /* total of 16 formats (8 reserved) */
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_CHANNEL_MASK">
<a name="IPATCH-SAMPLE-CHANNEL-MASK--CAPS"></a><h3>IPATCH_SAMPLE_CHANNEL_MASK</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_CHANNEL_MASK 0x070 /* channel count (8 channels max) */
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_SIGN_MASK">
<a name="IPATCH-SAMPLE-SIGN-MASK--CAPS"></a><h3>IPATCH_SAMPLE_SIGN_MASK</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_SIGN_MASK 0x080 /* sign or unsigned (for PCM formats) */
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_ENDIAN_MASK">
<a name="IPATCH-SAMPLE-ENDIAN-MASK--CAPS"></a><h3>IPATCH_SAMPLE_ENDIAN_MASK</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_ENDIAN_MASK 0x100 /* endian byte order */
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_WIDTH_SHIFT">
<a name="IPATCH-SAMPLE-WIDTH-SHIFT--CAPS"></a><h3>IPATCH_SAMPLE_WIDTH_SHIFT</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_WIDTH_SHIFT 0
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_CHANNEL_SHIFT">
<a name="IPATCH-SAMPLE-CHANNEL-SHIFT--CAPS"></a><h3>IPATCH_SAMPLE_CHANNEL_SHIFT</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_CHANNEL_SHIFT 4
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_SIGN_SHIFT">
<a name="IPATCH-SAMPLE-SIGN-SHIFT--CAPS"></a><h3>IPATCH_SAMPLE_SIGN_SHIFT</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_SIGN_SHIFT 7
</pre>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_ENDIAN_SHIFT">
<a name="IPATCH-SAMPLE-ENDIAN-SHIFT--CAPS"></a><h3>IPATCH_SAMPLE_ENDIAN_SHIFT</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_ENDIAN_SHIFT 8
</pre>
</div>
<hr>
<div class="refsect2" title="enum IpatchSampleWidth">
<a name="IpatchSampleWidth"></a><h3>enum IpatchSampleWidth</h3>
<pre class="programlisting">typedef enum
{
IPATCH_SAMPLE_INVALID = 0,
IPATCH_SAMPLE_8BIT = 1,
IPATCH_SAMPLE_16BIT = 2,
IPATCH_SAMPLE_24BIT = 3,
IPATCH_SAMPLE_32BIT = 4,
IPATCH_SAMPLE_FLOAT = 5,
IPATCH_SAMPLE_DOUBLE = 6,
IPATCH_SAMPLE_REAL24BIT = 7
} IpatchSampleWidth;
</pre>
<p>
Sample data widths/formats.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="IPATCH-SAMPLE-INVALID--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_INVALID</code></span></p></td>
<td> Invalid format (so 0 can be used to indicate a NULL state)
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-8BIT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_8BIT</code></span></p></td>
<td> 8 bit integer PCM
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-16BIT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_16BIT</code></span></p></td>
<td> 16 bit integer PCM
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-24BIT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_24BIT</code></span></p></td>
<td> 24 bit integer PCM (32 bit ints)
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-32BIT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_32BIT</code></span></p></td>
<td> 32 bit integer PCM
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-FLOAT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_FLOAT</code></span></p></td>
<td> 32 bit IEEE float (-1.0 - 1.0)
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-DOUBLE--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_DOUBLE</code></span></p></td>
<td> 64 bit IEEE double (-1.0 - 1.0)
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-REAL24BIT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_REAL24BIT</code></span></p></td>
<td> Real 3 byte 24 bit data (not padded to 32 bits)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum IpatchSampleChannel">
<a name="IpatchSampleChannel"></a><h3>enum IpatchSampleChannel</h3>
<pre class="programlisting">typedef enum
{
IPATCH_SAMPLE_MONO = 0 << IPATCH_SAMPLE_CHANNEL_SHIFT,
IPATCH_SAMPLE_STEREO = 1 << IPATCH_SAMPLE_CHANNEL_SHIFT
} IpatchSampleChannel;
</pre>
<p>
Descriptive enums for common audio channel configurations. These values
are actually channel count - 1 (0 = mono, 1 = stereo, etc) and can be compared
with the macro <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-FORMAT-GET-CHANNELS--CAPS"
><code class="function">IPATCH_SAMPLE_FORMAT_GET_CHANNELS()</code></a>.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="IPATCH-SAMPLE-MONO--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_MONO</code></span></p></td>
<td> Mono audio
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-STEREO--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_STEREO</code></span></p></td>
<td> Stereo audio
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum IpatchSampleChannelType">
<a name="IpatchSampleChannelType"></a><h3>enum IpatchSampleChannelType</h3>
<pre class="programlisting">typedef enum
{
IPATCH_SAMPLE_LEFT = 0,
IPATCH_SAMPLE_RIGHT = 1
} IpatchSampleChannelType;
</pre>
<p>
Channel designation. Currently there are only 2 designated channels,
though the remaining 6 supported channels may be defined to be surround
sound channels in the future.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="IPATCH-SAMPLE-LEFT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_LEFT</code></span></p></td>
<td> Left channel comes first
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-RIGHT--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_RIGHT</code></span></p></td>
<td> Right channel comes second
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_MAX_CHANNELS">
<a name="IPATCH-SAMPLE-MAX-CHANNELS--CAPS"></a><h3>IPATCH_SAMPLE_MAX_CHANNELS</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_MAX_CHANNELS 8
</pre>
<p>
Maximum number of audio channels handled by libInstPatch.</p>
</div>
<hr>
<div class="refsect2" title="enum IpatchSampleSign">
<a name="IpatchSampleSign"></a><h3>enum IpatchSampleSign</h3>
<pre class="programlisting">typedef enum
{
IPATCH_SAMPLE_SIGNED = 0 << IPATCH_SAMPLE_SIGN_SHIFT,
IPATCH_SAMPLE_UNSIGNED = 1 << IPATCH_SAMPLE_SIGN_SHIFT
} IpatchSampleSign;
</pre>
<p>
Defines the sign of PCM integer audio data.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="IPATCH-SAMPLE-SIGNED--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_SIGNED</code></span></p></td>
<td> Signed PCM audio data.
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-UNSIGNED--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_UNSIGNED</code></span></p></td>
<td> Unsigned PCM audio data.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum IpatchSampleEndian">
<a name="IpatchSampleEndian"></a><h3>enum IpatchSampleEndian</h3>
<pre class="programlisting">typedef enum
{
IPATCH_SAMPLE_LENDIAN = 0 << IPATCH_SAMPLE_ENDIAN_SHIFT,
IPATCH_SAMPLE_BENDIAN = 1 << IPATCH_SAMPLE_ENDIAN_SHIFT
} IpatchSampleEndian;
</pre>
<p>
Defines the byte order of multi-byte audio data.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="IPATCH-SAMPLE-LENDIAN--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_LENDIAN</code></span></p></td>
<td> Little endian byte order
</td>
</tr>
<tr>
<td><p><a name="IPATCH-SAMPLE-BENDIAN--CAPS"></a><span class="term"><code class="literal">IPATCH_SAMPLE_BENDIAN</code></span></p></td>
<td> Big endian byte order
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_ENDIAN_HOST">
<a name="IPATCH-SAMPLE-ENDIAN-HOST--CAPS"></a><h3>IPATCH_SAMPLE_ENDIAN_HOST</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_ENDIAN_HOST</pre>
<p>
Host byte order value (<span class="type">IPATCH_SAMPLE_LENDIAN</span> or <span class="type">IPATCH_SAMPLE_BENDIAN</span>).</p>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_GET_WIDTH()">
<a name="IPATCH-SAMPLE-FORMAT-GET-WIDTH--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_GET_WIDTH()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_GET_WIDTH(format)</pre>
<p>
Get <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleWidth"
><span class="type">IpatchSampleWidth</span></a> enum from a sample format integer.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Format field of sample format integer.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_GET_CHANNELS()">
<a name="IPATCH-SAMPLE-FORMAT-GET-CHANNELS--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_GET_CHANNELS()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_GET_CHANNELS(format)</pre>
<p>
Get the channel field from a sample format integer.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Channel field value (see <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleChannel"
><span class="type">IpatchSampleChannel</span></a>)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_GET_CHANNEL_COUNT()">
<a name="IPATCH-SAMPLE-FORMAT-GET-CHANNEL-COUNT--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_GET_CHANNEL_COUNT()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_GET_CHANNEL_COUNT(format)</pre>
<p>
Get the channel count from a sample format integer.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Channel count (starting at 1 for mono).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_IS_SIGNED()">
<a name="IPATCH-SAMPLE-FORMAT-IS-SIGNED--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_IS_SIGNED()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_IS_SIGNED(format)</pre>
<p>
Check if a sample format integer defines signed audio.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if sample format is signed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_IS_UNSIGNED()">
<a name="IPATCH-SAMPLE-FORMAT-IS-UNSIGNED--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_IS_UNSIGNED()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_IS_UNSIGNED(format)</pre>
<p>
Check if a sample format integer defines unsigned audio.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if sample format is unsigned.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_IS_LENDIAN()">
<a name="IPATCH-SAMPLE-FORMAT-IS-LENDIAN--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_IS_LENDIAN()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_IS_LENDIAN(format)</pre>
<p>
Check if a sample format integer defines little endian audio.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if sample format is little endian.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_FORMAT_IS_BENDIAN()">
<a name="IPATCH-SAMPLE-FORMAT-IS-BENDIAN--CAPS"></a><h3>IPATCH_SAMPLE_FORMAT_IS_BENDIAN()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_FORMAT_IS_BENDIAN(format)</pre>
<p>
Check if a sample format integer defines big endian audio.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if sample format is big endian.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_format_size()">
<a name="ipatch-sample-format-size"></a><h3>ipatch_sample_format_size()</h3>
<pre class="programlisting">#define ipatch_sample_format_size(format)</pre>
<p>
Get frame byte size for a given sample format (sample byte size * channels).</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format integer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Size in bytes of a single sample frame.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_format_width()">
<a name="ipatch-sample-format-width"></a><h3>ipatch_sample_format_width()</h3>
<pre class="programlisting">#define ipatch_sample_format_width(format)</pre>
<p>
Gets the number of bytes used for storing a single sample for <em class="parameter"><code>format</code></em>.
Doesn't take into account channels. This is the number of bytes used
to store the samples, not the effective bit width. For example:
<span class="type">IPATCH_SAMPLE_24BIT</span> uses 4 bytes for each sample.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Byte width of a single sample (not including channels).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_MAP_CHANNEL()">
<a name="IPATCH-SAMPLE-MAP-CHANNEL--CAPS"></a><h3>IPATCH_SAMPLE_MAP_CHANNEL()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_MAP_CHANNEL(dest, src) ((src) << (3 * (dest)))
</pre>
<p>
Macro to calculate a channel mapping value for a given destination and
source. A channel mapping is composed of up to 24 bits
(3 bits * 8 channels = 24). Channel mappings are used for sample
conversions to route channels from a source format to a destination format.
Multiple channel map values should be OR'd together.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td> Destination channel in mapping bit field (0-7)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td> Source channel (0-7)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_MAP_GET_CHANNEL()">
<a name="IPATCH-SAMPLE-MAP-GET-CHANNEL--CAPS"></a><h3>IPATCH_SAMPLE_MAP_GET_CHANNEL()</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_MAP_GET_CHANNEL(map, dest) (((map) >> ((dest) * 3)) & 0x07)
</pre>
<p>
Macro to get a source channel value given a destination channel.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>map</code></em> :</span></p></td>
<td> Channel map value (<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"
><span class="type">guint32</span></a> - only 24 bits are used)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td> Destination channel in <em class="parameter"><code>map</code></em> bit field (0-7)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Source channel for <em class="parameter"><code>dest</code></em> (0-7)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="IPATCH_SAMPLE_UNITY_CHANNEL_MAP">
<a name="IPATCH-SAMPLE-UNITY-CHANNEL-MAP--CAPS"></a><h3>IPATCH_SAMPLE_UNITY_CHANNEL_MAP</h3>
<pre class="programlisting">#define IPATCH_SAMPLE_UNITY_CHANNEL_MAP 0xFAC688
</pre>
<p>
Unity channel mapping which routes each input channel to the same output
channel.</p>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_format_bit_width ()">
<a name="ipatch-sample-format-bit-width"></a><h3>ipatch_sample_format_bit_width ()</h3>
<pre class="programlisting">int ipatch_sample_format_bit_width (int format);</pre>
<p>
Like <a
href="../libinstpatch/libinstpatch-sample.html#ipatch-sample-format-width"
><code class="function">ipatch_sample_format_width()</code></a> but gets the effective bit width of the
format. Of note is this is not always equivelant to the format width * 8.
For example: <span class="type">IPATCH_SAMPLE_FLOAT</span> has an effective bit width of 23,
<span class="type">IPATCH_SAMPLE_24BIT</span> has an effective bit width of 24 but is stored in 32
bits. This function is really only useful for comparing the relative
"quality" of formats, and the actual returned values may change in the
future.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Effective bit width of format.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_format_verify ()">
<a name="ipatch-sample-format-verify"></a><h3>ipatch_sample_format_verify ()</h3>
<pre class="programlisting"><a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"
>gboolean</a> ipatch_sample_format_verify (int format);</pre>
<p>
Verify a sample format integer.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> Sample format (<a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleWidth"
><span class="type">IpatchSampleWidth</span></a> | <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleSign"
><span class="type">IpatchSampleSign</span></a>
| <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleEndian"
><span class="type">IpatchSampleEndian</span></a> | <a
href="../libinstpatch/libinstpatch-sample.html#IpatchSampleChannel"
><span class="type">IpatchSampleChannel</span></a>).
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if valid, <code class="literal">FALSE</code> otherwise
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_format_transform_verify ()">
<a name="ipatch-sample-format-transform-verify"></a><h3>ipatch_sample_format_transform_verify ()</h3>
<pre class="programlisting"><a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"
>gboolean</a> ipatch_sample_format_transform_verify
(int src_format,
int dest_format,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"
>guint32</a> channel_map);</pre>
<p>
Verify source and destination sample formats and channel map for a sample
transform operation.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_format</code></em> :</span></p></td>
<td> Source sample format
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_format</code></em> :</span></p></td>
<td> Destination sample format
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel_map</code></em> :</span></p></td>
<td> Channel mapping (use <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-UNITY-CHANNEL-MAP--CAPS"
><span class="type">IPATCH_SAMPLE_UNITY_CHANNEL_MAP</span></a>
to map all input channels to the same output channels, see
<a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAP-CHANNEL--CAPS"
><span class="type">IPATCH_SAMPLE_MAP_CHANNEL</span></a> macro for constructing channel map values)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> on success, <code class="literal">FALSE</code> otherwise
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_sample_get_transform_funcs ()">
<a name="ipatch-sample-get-transform-funcs"></a><h3>ipatch_sample_get_transform_funcs ()</h3>
<pre class="programlisting"><a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> ipatch_sample_get_transform_funcs (int src_format,
int dest_format,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"
>guint32</a> channel_map,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> *buf1_max_frame,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"
>guint</a> *buf2_max_frame,
<a
href="../libinstpatch/libinstpatch-IpatchSampleTransform.html#IpatchSampleTransformFunc"
>IpatchSampleTransformFunc</a> *funcs);</pre>
<p>
Get transform function array for converting from <em class="parameter"><code>src_format</code></em> to
<em class="parameter"><code>dest_format</code></em>.
</p>
<p>
<em class="parameter"><code>func_count</code></em>: Count of function pointers stored to <em class="parameter"><code>funcs</code></em>. Can be 0 if no
transform is required.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_format</code></em> :</span></p></td>
<td> Source audio format to convert from
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_format</code></em> :</span></p></td>
<td> Destination audio format to convert to
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel_map</code></em> :</span></p></td>
<td> Channel mapping (use <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-UNITY-CHANNEL-MAP--CAPS"
><span class="type">IPATCH_SAMPLE_UNITY_CHANNEL_MAP</span></a>
to map all input channels to the same output channels, 3 bits times
<a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAX-CHANNELS--CAPS"
><span class="type">IPATCH_SAMPLE_MAX_CHANNELS</span></a> (8) = 24 bits total, see
<a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAP-CHANNEL--CAPS"
><span class="type">IPATCH_SAMPLE_MAP_CHANNEL</span></a> macro for constructing channel map values)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf1_max_frame</code></em> :</span></p></td>
<td> Output - maximum sample frame size for first buffer
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf2_max_frame</code></em> :</span></p></td>
<td> Output - maximum sample frame size for second buffer
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>funcs</code></em> :</span></p></td>
<td> Caller provided array to store transform functions to. It should
have at least <a
href="../libinstpatch/libinstpatch-sample.html#IPATCH-SAMPLE-MAX-TRANSFORM-FUNCS--CAPS"
><span class="type">IPATCH_SAMPLE_MAX_TRANSFORM_FUNCS</span></a> elements.
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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