Google Git
Sign in
coral / mtk-gst-plugins-base-debian / 406546ae6feb37cd86c83f0b8651fd2a2a332a53 / . / docs / libs / html / gst-plugins-base-libs-gstringbuffer.html
blob: 35201597c8662291e16517460450f86a69395920 [file] [log] [blame]
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>gstringbuffer</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="index.html" title="GStreamer Base Plugins 0.11 Library Reference Manual">
<link rel="up" href="gstreamer-audio.html" title="Audio Library">
<link rel="prev" href="gst-plugins-base-libs-gstmultichannel.html" title="gstmultichannel">
<link rel="next" href="gst-plugins-base-libs-gstaudioiec61937.html" title="gstaudioiec61937">
<meta name="generator" content="GTK-Doc V1.18 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="gst-plugins-base-libs-gstmultichannel.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="gstreamer-audio.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">GStreamer Base Plugins 0.11 Library Reference Manual</th>
<td><a accesskey="n" href="gst-plugins-base-libs-gstaudioiec61937.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#gst-plugins-base-libs-gstringbuffer.synopsis" class="shortcut">Top</a>
 | 
<a href="#gst-plugins-base-libs-gstringbuffer.description" class="shortcut">Description</a>
 | 
<a href="#gst-plugins-base-libs-gstringbuffer.object-hierarchy" class="shortcut">Object Hierarchy</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstringbuffer"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstringbuffer.top_of_page"></a>gstringbuffer</span></h2>
<p>gstringbuffer — Base class for audio ringbuffer implementations</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstringbuffer.synopsis"></a><h2>Synopsis</h2>
<a name="GstRingBuffer"></a><pre class="synopsis">
#include &lt;gst/audio/gstringbuffer.h&gt;
struct <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer-struct" title="struct GstRingBuffer">GstRingBuffer</a>;
struct <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferClass" title="struct GstRingBufferClass">GstRingBufferClass</a>;
struct <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec">GstRingBufferSpec</a>;
<span class="returnvalue">void</span> (<a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferCallback" title="GstRingBufferCallback ()">*GstRingBufferCallback</a>) (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *rbuf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
enum <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSegState" title="enum GstRingBufferSegState">GstRingBufferSegState</a>;
enum <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferState" title="enum GstRingBufferState">GstRingBufferState</a>;
enum <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstBufferFormatType" title="enum GstBufferFormatType">GstBufferFormatType</a>;
#define <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GST-RING-BUFFER-BROADCAST:CAPS" title="GST_RING_BUFFER_BROADCAST()">GST_RING_BUFFER_BROADCAST</a> (buf)
#define <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GST-RING-BUFFER-GET-COND:CAPS" title="GST_RING_BUFFER_GET_COND()">GST_RING_BUFFER_GET_COND</a> (buf)
#define <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GST-RING-BUFFER-SIGNAL:CAPS" title="GST_RING_BUFFER_SIGNAL()">GST_RING_BUFFER_SIGNAL</a> (buf)
#define <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GST-RING-BUFFER-WAIT:CAPS" title="GST_RING_BUFFER_WAIT()">GST_RING_BUFFER_WAIT</a> (buf)
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-set-callback" title="gst_ring_buffer_set_callback ()">gst_ring_buffer_set_callback</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferCallback" title="GstRingBufferCallback ()"><span class="type">GstRingBufferCallback</span></a> cb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-acquire" title="gst_ring_buffer_acquire ()">gst_ring_buffer_acquire</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec"><span class="type">GstRingBufferSpec</span></a> *spec</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-release" title="gst_ring_buffer_release ()">gst_ring_buffer_release</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-is-acquired" title="gst_ring_buffer_is_acquired ()">gst_ring_buffer_is_acquired</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-activate" title="gst_ring_buffer_activate ()">gst_ring_buffer_activate</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-is-active" title="gst_ring_buffer_is_active ()">gst_ring_buffer_is_active</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-start" title="gst_ring_buffer_start ()">gst_ring_buffer_start</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-pause" title="gst_ring_buffer_pause ()">gst_ring_buffer_pause</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-stop" title="gst_ring_buffer_stop ()">gst_ring_buffer_stop</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-delay" title="gst_ring_buffer_delay ()">gst_ring_buffer_delay</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-samples-done" title="gst_ring_buffer_samples_done ()">gst_ring_buffer_samples_done</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-set-sample" title="gst_ring_buffer_set_sample ()">gst_ring_buffer_set_sample</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-commit" title="gst_ring_buffer_commit ()">gst_ring_buffer_commit</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-commit-full" title="gst_ring_buffer_commit_full ()">gst_ring_buffer_commit_full</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> in_samples</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> out_samples</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *accum</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-convert" title="gst_ring_buffer_convert ()">gst_ring_buffer_convert</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a> src_fmt</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> src_val</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a> dest_fmt</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> *dest_val</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-prepare-read" title="gst_ring_buffer_prepare_read ()">gst_ring_buffer_prepare_read</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *segment</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> **readptr</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *len</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-read" title="gst_ring_buffer_read ()">gst_ring_buffer_read</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-clear" title="gst_ring_buffer_clear ()">gst_ring_buffer_clear</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> segment</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-clear-all" title="gst_ring_buffer_clear_all ()">gst_ring_buffer_clear_all</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-advance" title="gst_ring_buffer_advance ()">gst_ring_buffer_advance</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> advance</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-close-device" title="gst_ring_buffer_close_device ()">gst_ring_buffer_close_device</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-open-device" title="gst_ring_buffer_open_device ()">gst_ring_buffer_open_device</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-device-is-open" title="gst_ring_buffer_device_is_open ()">gst_ring_buffer_device_is_open</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-may-start" title="gst_ring_buffer_may_start ()">gst_ring_buffer_may_start</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> allowed</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-parse-caps" title="gst_ring_buffer_parse_caps ()">gst_ring_buffer_parse_caps</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec"><span class="type">GstRingBufferSpec</span></a> *spec</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-set-flushing" title="gst_ring_buffer_set_flushing ()">gst_ring_buffer_set_flushing</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flushing</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstringbuffer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
+----GstRingBuffer
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstringbuffer.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="id484218"></a><p>
This object is the base class for audio ringbuffers used by the base
audio source and sink classes.
</p>
<p>
The ringbuffer abstracts a circular buffer of data. One reader and
one writer can operate on the data from different threads in a lockfree
manner. The base class is sufficiently flexible to be used as an
abstraction for DMA based ringbuffers as well as a pure software
implementations.
</p>
</div>
<p>
</p>
<p>
Last reviewed on 2006-02-02 (0.10.4)
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstringbuffer.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstRingBuffer-struct"></a><h3>struct GstRingBuffer</h3>
<pre class="programlisting">struct GstRingBuffer {
GCond *cond;
gboolean open;
gboolean acquired;
guint8 *memory;
gsize size;
GstRingBufferSpec spec;
GstRingBufferSegState *segstate;
gint samples_per_seg;
guint8 *empty_seg;
gint state;
gint segdone;
gint segbase;
gint waiting;
};
</pre>
<p>
The ringbuffer base class structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Threads.html#GCond"><span class="type">GCond</span></a> *<em class="structfield"><code><a name="GstRingBuffer-struct.cond"></a>cond</code></em>;</span></p></td>
<td>used to signal start/stop/pause/resume actions</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.open"></a>open</code></em>;</span></p></td>
<td>boolean indicating that the ringbuffer is open</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.acquired"></a>acquired</code></em>;</span></p></td>
<td>boolean indicating that the ringbuffer is acquired</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> *<em class="structfield"><code><a name="GstRingBuffer-struct.memory"></a>memory</code></em>;</span></p></td>
<td>data in the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.size"></a>size</code></em>;</span></p></td>
<td>size of data in the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec"><span class="type">GstRingBufferSpec</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.spec"></a>spec</code></em>;</span></p></td>
<td>format and layout of the ringbuffer data</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSegState" title="enum GstRingBufferSegState"><span class="type">GstRingBufferSegState</span></a> *<em class="structfield"><code><a name="GstRingBuffer-struct.segstate"></a>segstate</code></em>;</span></p></td>
<td>status of each segment in the ringbuffer (unused)</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.samples-per-seg"></a>samples_per_seg</code></em>;</span></p></td>
<td>number of samples in one segment</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> *<em class="structfield"><code><a name="GstRingBuffer-struct.empty-seg"></a>empty_seg</code></em>;</span></p></td>
<td>pointer to memory holding one segment of silence samples</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.state"></a>state</code></em>;</span></p></td>
<td>state of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.segdone"></a>segdone</code></em>;</span></p></td>
<td>readpointer in the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.segbase"></a>segbase</code></em>;</span></p></td>
<td>segment corresponding to segment 0 (unused)</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBuffer-struct.waiting"></a>waiting</code></em>;</span></p></td>
<td>is a reader or writer waiting for a free segment</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRingBufferClass"></a><h3>struct GstRingBufferClass</h3>
<pre class="programlisting">struct GstRingBufferClass {
GstObjectClass parent_class;
gboolean (*open_device) (GstRingBuffer *buf);
gboolean (*acquire) (GstRingBuffer *buf, GstRingBufferSpec *spec);
gboolean (*release) (GstRingBuffer *buf);
gboolean (*close_device) (GstRingBuffer *buf);
gboolean (*start) (GstRingBuffer *buf);
gboolean (*pause) (GstRingBuffer *buf);
gboolean (*resume) (GstRingBuffer *buf);
gboolean (*stop) (GstRingBuffer *buf);
guint (*delay) (GstRingBuffer *buf);
/* ABI added */
gboolean (*activate) (GstRingBuffer *buf, gboolean active);
guint (*commit) (GstRingBuffer * buf, guint64 *sample,
guchar * data, gint in_samples,
gint out_samples, gint * accum);
void (*clear_all) (GstRingBuffer * buf);
};
</pre>
<p>
The vmethods that subclasses can override to implement the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#GstObjectClass"><span class="type">GstObjectClass</span></a> <em class="structfield"><code><a name="GstRingBufferClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>parent class</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.open-device"></a>open_device</code></em> ()</span></p></td>
<td>open the device, don't set any params or allocate anything</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.acquire"></a>acquire</code></em> ()</span></p></td>
<td>allocate the resources for the ringbuffer using the given spec</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.release"></a>release</code></em> ()</span></p></td>
<td>free resources of the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.close-device"></a>close_device</code></em> ()</span></p></td>
<td>close the device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.start"></a>start</code></em> ()</span></p></td>
<td>start processing of samples</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.pause"></a>pause</code></em> ()</span></p></td>
<td>pause processing of samples</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.resume"></a>resume</code></em> ()</span></p></td>
<td>resume processing of samples after pause</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.stop"></a>stop</code></em> ()</span></p></td>
<td>stop processing of samples</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.delay"></a>delay</code></em> ()</span></p></td>
<td>get number of samples queued in device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.activate"></a>activate</code></em> ()</span></p></td>
<td>activate the thread that starts pulling and monitoring the
consumed segments in the device. Since 0.10.22</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.commit"></a>commit</code></em> ()</span></p></td>
<td>write samples into the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstRingBufferClass.clear-all"></a>clear_all</code></em> ()</span></p></td>
<td>clear the entire ringbuffer Since 0.10.24</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRingBufferSpec"></a><h3>struct GstRingBufferSpec</h3>
<pre class="programlisting">struct GstRingBufferSpec {
/* in */
GstCaps *caps; /* the caps of the buffer */
/* in/out */
GstBufferFormatType type;
GstAudioInfo info;
guint64 latency_time; /* the required/actual latency time, this is the
* actual the size of one segment and the
* minimum possible latency we can achieve. */
guint64 buffer_time; /* the required/actual time of the buffer, this is
* the total size of the buffer and maximum
* latency we can compensate for. */
gint segsize; /* size of one buffer segment in bytes, this value
* should be chosen to match latency_time as
* well as possible. */
gint segtotal; /* total number of segments, this value is the
* number of segments of @segsize and should be
* chosen so that it matches buffer_time as
* close as possible. */
/* ABI added 0.10.20 */
gint seglatency; /* number of segments queued in the lower
* level device, defaults to segtotal. */
};
</pre>
<p>
The structure containing the format specification of the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *<em class="structfield"><code><a name="GstRingBufferSpec.caps"></a>caps</code></em>;</span></p></td>
<td>The caps that generated the Spec.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstBufferFormatType" title="enum GstBufferFormatType"><span class="type">GstBufferFormatType</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.type"></a>type</code></em>;</span></p></td>
<td>the sample type</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.info"></a>info</code></em>;</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.latency-time"></a>latency_time</code></em>;</span></p></td>
<td>the latency in microseconds</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.buffer-time"></a>buffer_time</code></em>;</span></p></td>
<td>the total buffer size in microseconds</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.segsize"></a>segsize</code></em>;</span></p></td>
<td>the size of one segment in bytes</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.segtotal"></a>segtotal</code></em>;</span></p></td>
<td>the total number of segments</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstRingBufferSpec.seglatency"></a>seglatency</code></em>;</span></p></td>
<td>number of segments queued in the lower level device,
defaults to segtotal</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRingBufferCallback"></a><h3>GstRingBufferCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstRingBufferCallback) (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *rbuf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
This function is set with <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-set-callback" title="gst_ring_buffer_set_callback ()"><code class="function">gst_ring_buffer_set_callback()</code></a> and is
called to fill the memory at <em class="parameter"><code>data</code></em> with <em class="parameter"><code>len</code></em> bytes of samples.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rbuf</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>target to fill</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>amount to fill</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRingBufferSegState"></a><h3>enum GstRingBufferSegState</h3>
<pre class="programlisting">typedef enum {
GST_SEGSTATE_INVALID,
GST_SEGSTATE_EMPTY,
GST_SEGSTATE_FILLED,
GST_SEGSTATE_PARTIAL
} GstRingBufferSegState;
</pre>
<p>
The state of a segment in the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-SEGSTATE-INVALID:CAPS"></a><span class="term"><code class="literal">GST_SEGSTATE_INVALID</code></span></p></td>
<td>The content of the segment is invalid
</td>
</tr>
<tr>
<td><p><a name="GST-SEGSTATE-EMPTY:CAPS"></a><span class="term"><code class="literal">GST_SEGSTATE_EMPTY</code></span></p></td>
<td>The segment is empty
</td>
</tr>
<tr>
<td><p><a name="GST-SEGSTATE-FILLED:CAPS"></a><span class="term"><code class="literal">GST_SEGSTATE_FILLED</code></span></p></td>
<td>The segment contains valid data
</td>
</tr>
<tr>
<td><p><a name="GST-SEGSTATE-PARTIAL:CAPS"></a><span class="term"><code class="literal">GST_SEGSTATE_PARTIAL</code></span></p></td>
<td>The segment partially contains valid data
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRingBufferState"></a><h3>enum GstRingBufferState</h3>
<pre class="programlisting">typedef enum {
GST_RING_BUFFER_STATE_STOPPED,
GST_RING_BUFFER_STATE_PAUSED,
GST_RING_BUFFER_STATE_STARTED
} GstRingBufferState;
</pre>
<p>
The state of the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-RING-BUFFER-STATE-STOPPED:CAPS"></a><span class="term"><code class="literal">GST_RING_BUFFER_STATE_STOPPED</code></span></p></td>
<td>The ringbuffer is stopped
</td>
</tr>
<tr>
<td><p><a name="GST-RING-BUFFER-STATE-PAUSED:CAPS"></a><span class="term"><code class="literal">GST_RING_BUFFER_STATE_PAUSED</code></span></p></td>
<td>The ringbuffer is paused
</td>
</tr>
<tr>
<td><p><a name="GST-RING-BUFFER-STATE-STARTED:CAPS"></a><span class="term"><code class="literal">GST_RING_BUFFER_STATE_STARTED</code></span></p></td>
<td>The ringbuffer is started
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstBufferFormatType"></a><h3>enum GstBufferFormatType</h3>
<pre class="programlisting">typedef enum {
GST_BUFTYPE_RAW,
GST_BUFTYPE_MU_LAW,
GST_BUFTYPE_A_LAW,
GST_BUFTYPE_IMA_ADPCM,
GST_BUFTYPE_MPEG,
GST_BUFTYPE_GSM,
GST_BUFTYPE_IEC958,
GST_BUFTYPE_AC3,
GST_BUFTYPE_EAC3,
GST_BUFTYPE_DTS,
GST_BUFTYPE_MPEG2_AAC,
GST_BUFTYPE_MPEG4_AAC,
} GstBufferFormatType;
</pre>
<p>
The format of the samples in the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-BUFTYPE-RAW:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_RAW</code></span></p></td>
<td>samples in linear or float
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-MU-LAW:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_MU_LAW</code></span></p></td>
<td>samples in mulaw
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-A-LAW:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_A_LAW</code></span></p></td>
<td>samples in alaw
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-IMA-ADPCM:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_IMA_ADPCM</code></span></p></td>
<td>samples in ima adpcm
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-MPEG:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_MPEG</code></span></p></td>
<td>samples in mpeg audio (but not AAC) format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-GSM:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_GSM</code></span></p></td>
<td>samples in gsm format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-IEC958:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_IEC958</code></span></p></td>
<td>samples in IEC958 frames (e.g. AC3)
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-AC3:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_AC3</code></span></p></td>
<td>samples in AC3 format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-EAC3:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_EAC3</code></span></p></td>
<td>samples in EAC3 format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-DTS:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_DTS</code></span></p></td>
<td>samples in DTS format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-MPEG2-AAC:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_MPEG2_AAC</code></span></p></td>
<td>samples in MPEG-2 AAC format
</td>
</tr>
<tr>
<td><p><a name="GST-BUFTYPE-MPEG4-AAC:CAPS"></a><span class="term"><code class="literal">GST_BUFTYPE_MPEG4_AAC</code></span></p></td>
<td>samples in MPEG-4 AAC format
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-RING-BUFFER-BROADCAST:CAPS"></a><h3>GST_RING_BUFFER_BROADCAST()</h3>
<pre class="programlisting">#define GST_RING_BUFFER_BROADCAST(buf)(g_cond_broadcast (GST_RING_BUFFER_GET_COND (buf)))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-RING-BUFFER-GET-COND:CAPS"></a><h3>GST_RING_BUFFER_GET_COND()</h3>
<pre class="programlisting">#define GST_RING_BUFFER_GET_COND(buf) (((GstRingBuffer *)buf)-&gt;cond)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-RING-BUFFER-SIGNAL:CAPS"></a><h3>GST_RING_BUFFER_SIGNAL()</h3>
<pre class="programlisting">#define GST_RING_BUFFER_SIGNAL(buf) (g_cond_signal (GST_RING_BUFFER_GET_COND (buf)))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-RING-BUFFER-WAIT:CAPS"></a><h3>GST_RING_BUFFER_WAIT()</h3>
<pre class="programlisting">#define GST_RING_BUFFER_WAIT(buf) (g_cond_wait (GST_RING_BUFFER_GET_COND (buf), GST_OBJECT_GET_LOCK (buf)))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-set-callback"></a><h3>gst_ring_buffer_set_callback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_set_callback (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferCallback" title="GstRingBufferCallback ()"><span class="type">GstRingBufferCallback</span></a> cb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Sets the given callback function on the buffer. This function
will be called every time a segment has been written to a device.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to set the callback on</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cb</code></em> :</span></p></td>
<td>the callback to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the callback</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-acquire"></a><h3>gst_ring_buffer_acquire ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_acquire (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec"><span class="type">GstRingBufferSpec</span></a> *spec</code></em>);</pre>
<p>
Allocate the resources for the ringbuffer. This function fills
in the data pointer of the ring buffer with a valid <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a>
to which samples can be written.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to acquire</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spec</code></em> :</span></p></td>
<td>the specs of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be acquired, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-release"></a><h3>gst_ring_buffer_release ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_release (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Free the resources of the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to release</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be released, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-is-acquired"></a><h3>gst_ring_buffer_is_acquired ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_is_acquired (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Check if the ringbuffer is acquired and ready to use.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the ringbuffer is acquired, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-activate"></a><h3>gst_ring_buffer_activate ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_activate (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);</pre>
<p>
Activate <em class="parameter"><code>buf</code></em> to start or stop pulling data.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to activate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>the new mode</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be activated in the requested mode,
FALSE on error.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.22.</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-is-active"></a><h3>gst_ring_buffer_is_active ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_is_active (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Check if <em class="parameter"><code>buf</code></em> is activated.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device is active.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.22.</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-start"></a><h3>gst_ring_buffer_start ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_start (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Start processing samples from the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to start</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be started, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-pause"></a><h3>gst_ring_buffer_pause ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_pause (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Pause processing samples from the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to pause</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be paused, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-stop"></a><h3>gst_ring_buffer_stop ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_stop (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Stop processing samples from the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to stop</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be stopped, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-delay"></a><h3>gst_ring_buffer_delay ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_ring_buffer_delay (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Get the number of samples queued in the audio device. This is
usually less than the segment size but can be bigger when the
implementation uses another internal buffer between the audio
device.
</p>
<p>
For playback ringbuffers this is the amount of samples transfered from the
ringbuffer to the device but still not played.
</p>
<p>
For capture ringbuffers this is the amount of samples in the device that are
not yet transfered to the ringbuffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of samples queued in the audio device.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-samples-done"></a><h3>gst_ring_buffer_samples_done ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a> gst_ring_buffer_samples_done (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Get the number of samples that were processed by the ringbuffer
since it was last started. This does not include the number of samples not
yet processed (see <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-delay" title="gst_ring_buffer_delay ()"><code class="function">gst_ring_buffer_delay()</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>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of samples processed by the ringbuffer.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-set-sample"></a><h3>gst_ring_buffer_set_sample ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_set_sample (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>);</pre>
<p>
Make sure that the next sample written to the device is
accounted for as being the <em class="parameter"><code>sample</code></em> sample written to the
device. This value will be used in reporting the current
sample position of the ringbuffer.
</p>
<p>
This function will also clear the buffer with silence.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sample</code></em> :</span></p></td>
<td>the sample number to set</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-commit"></a><h3>gst_ring_buffer_commit ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_ring_buffer_commit (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>);</pre>
<p>
Same as <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-commit-full" title="gst_ring_buffer_commit_full ()"><code class="function">gst_ring_buffer_commit_full()</code></a> but with a in_samples and out_samples
equal to <em class="parameter"><code>len</code></em>, ignoring accum.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to commit</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sample</code></em> :</span></p></td>
<td>the sample position of the data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to commit</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>the number of samples in the data to commit</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of samples written to the ringbuffer or -1 on
error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-commit-full"></a><h3>gst_ring_buffer_commit_full ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_ring_buffer_commit_full (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> in_samples</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> out_samples</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *accum</code></em>);</pre>
<p>
Commit <em class="parameter"><code>in_samples</code></em> samples pointed to by <em class="parameter"><code>data</code></em> to the ringbuffer <em class="parameter"><code>buf</code></em>.
</p>
<p>
<em class="parameter"><code>in_samples</code></em> and <em class="parameter"><code>out_samples</code></em> define the rate conversion to perform on the the
samples in <em class="parameter"><code>data</code></em>. For negative rates, <em class="parameter"><code>out_samples</code></em> must be negative and
<em class="parameter"><code>in_samples</code></em> positive.
</p>
<p>
When <em class="parameter"><code>out_samples</code></em> is positive, the first sample will be written at position <em class="parameter"><code>sample</code></em>
in the ringbuffer. When <em class="parameter"><code>out_samples</code></em> is negative, the last sample will be written to
<em class="parameter"><code>sample</code></em> in reverse order.
</p>
<p>
<em class="parameter"><code>out_samples</code></em> does not need to be a multiple of the segment size of the ringbuffer
although it is recommended for optimal performance.
</p>
<p>
<em class="parameter"><code>accum</code></em> will hold a temporary accumulator used in rate conversion and should be
set to 0 when this function is first called. In case the commit operation is
interrupted, one can resume the processing by passing the previously returned
<em class="parameter"><code>accum</code></em> value back to this function.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to commit</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sample</code></em> :</span></p></td>
<td>the sample position of the data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to commit</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in_samples</code></em> :</span></p></td>
<td>the number of samples in the data to commit</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_samples</code></em> :</span></p></td>
<td>the number of samples to write to the ringbuffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>accum</code></em> :</span></p></td>
<td>accumulator for rate conversion.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of samples written to the ringbuffer or -1 on error. The
number of samples written can be less than <em class="parameter"><code>out_samples</code></em> when <em class="parameter"><code>buf</code></em> was interrupted
with a flush or stop.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11.</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-convert"></a><h3>gst_ring_buffer_convert ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_convert (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a> src_fmt</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> src_val</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a> dest_fmt</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> *dest_val</code></em>);</pre>
<p>
Convert <em class="parameter"><code>src_val</code></em> in <em class="parameter"><code>src_fmt</code></em> to the equivalent value in <em class="parameter"><code>dest_fmt</code></em>. The result
will be put in <em class="parameter"><code>dest_val</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_fmt</code></em> :</span></p></td>
<td>the source format</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_val</code></em> :</span></p></td>
<td>the source value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_fmt</code></em> :</span></p></td>
<td>the destination format</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_val</code></em> :</span></p></td>
<td>a location to store the converted value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the conversion succeeded.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.22.</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-prepare-read"></a><h3>gst_ring_buffer_prepare_read ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_prepare_read (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *segment</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint8"><span class="type">guint8</span></a> **readptr</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *len</code></em>);</pre>
<p>
Returns a pointer to memory where the data from segment <em class="parameter"><code>segment</code></em>
can be found. This function is mostly used by subclasses.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to read from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>segment</code></em> :</span></p></td>
<td>the segment to read</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>readptr</code></em> :</span></p></td>
<td>the pointer to the memory where samples can be read</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>the number of bytes to read</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>FALSE if the buffer is not started.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-read"></a><h3>gst_ring_buffer_read ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_ring_buffer_read (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> sample</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> len</code></em>);</pre>
<p>
Read <em class="parameter"><code>len</code></em> samples from the ringbuffer into the memory pointed
to by <em class="parameter"><code>data</code></em>.
The first sample should be read from position <em class="parameter"><code>sample</code></em> in
the ringbuffer.
</p>
<p>
<em class="parameter"><code>len</code></em> should not be a multiple of the segment size of the ringbuffer
although it is recommended.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to read from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sample</code></em> :</span></p></td>
<td>the sample position of the data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>where the data should be read</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>the number of samples in data to read</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of samples read from the ringbuffer or -1 on
error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-clear"></a><h3>gst_ring_buffer_clear ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_clear (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> segment</code></em>);</pre>
<p>
Clear the given segment of the buffer with silence samples.
This function is used by subclasses.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to clear</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>segment</code></em> :</span></p></td>
<td>the segment to clear</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-clear-all"></a><h3>gst_ring_buffer_clear_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_clear_all (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Fill the ringbuffer with silence.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to clear</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-advance"></a><h3>gst_ring_buffer_advance ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_advance (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> advance</code></em>);</pre>
<p>
Subclasses should call this function to notify the fact that
<em class="parameter"><code>advance</code></em> segments are now processed by the device.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to advance</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>advance</code></em> :</span></p></td>
<td>the number of segments written</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-close-device"></a><h3>gst_ring_buffer_close_device ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_close_device (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Close the audio device associated with the ring buffer. The ring buffer
should already have been released via <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#gst-ring-buffer-release" title="gst_ring_buffer_release ()"><code class="function">gst_ring_buffer_release()</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>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be closed, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-open-device"></a><h3>gst_ring_buffer_open_device ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_open_device (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Open the audio device associated with the ring buffer. Does not perform any
setup on the device. You must open the device before acquiring the ring
buffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device could be opened, FALSE on error.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-device-is-open"></a><h3>gst_ring_buffer_device_is_open ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_device_is_open (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>);</pre>
<p>
Checks the status of the device associated with the ring buffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the device was open, FALSE if it was closed.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-may-start"></a><h3>gst_ring_buffer_may_start ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_may_start (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> allowed</code></em>);</pre>
<p>
Tell the ringbuffer that it is allowed to start playback when
the ringbuffer is filled with samples.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>allowed</code></em> :</span></p></td>
<td>the new value</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.6</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-parse-caps"></a><h3>gst_ring_buffer_parse_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_ring_buffer_parse_caps (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBufferSpec" title="struct GstRingBufferSpec"><span class="type">GstRingBufferSpec</span></a> *spec</code></em>,
<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Parse <em class="parameter"><code>caps</code></em> into <em class="parameter"><code>spec</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>spec</code></em> :</span></p></td>
<td>a spec</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the caps could be parsed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ring-buffer-set-flushing"></a><h3>gst_ring_buffer_set_flushing ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_ring_buffer_set_flushing (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flushing</code></em>);</pre>
<p>
Set the ringbuffer to flushing mode or normal mode.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> to flush</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flushing</code></em> :</span></p></td>
<td>the new mode</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstringbuffer.see-also"></a><h2>See Also</h2>
<a class="link" href="gst-plugins-base-libs-gstbaseaudiosink.html#GstBaseAudioSink"><span class="type">GstBaseAudioSink</span></a>, <a class="link" href="gst-plugins-base-libs-gstaudiosink.html#GstAudioSink"><span class="type">GstAudioSink</span></a>
</div>
</div>
<div class="footer">
<hr>
Generated by GTK-Doc V1.18</div>
</body>
</html>