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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#GstBaseTransform.synopsis" class="shortcut">Top</a>
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<a href="#GstBaseTransform.description" class="shortcut">Description</a>
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<a href="#GstBaseTransform.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#GstBaseTransform.properties" class="shortcut">Properties</a>
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<div class="refentry" title="GstBaseTransform">
<a name="GstBaseTransform"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstBaseTransform.top_of_page"></a>GstBaseTransform</span></h2>
<p>GstBaseTransform — Base class for simple transform filters</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="GstBaseTransform.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/base/gstbasetransform.h>
<a class="link" href="GstBaseTransform.html#GstBaseTransform-struct" title="GstBaseTransform">GstBaseTransform</a>;
<a class="link" href="GstBaseTransform.html#GstBaseTransformClass" title="GstBaseTransformClass">GstBaseTransformClass</a>;
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBaseTransform.html#gst-base-transform-is-passthrough" title="gst_base_transform_is_passthrough ()">gst_base_transform_is_passthrough</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-set-passthrough" title="gst_base_transform_set_passthrough ()">gst_base_transform_set_passthrough</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> passthrough</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBaseTransform.html#gst-base-transform-is-in-place" title="gst_base_transform_is_in_place ()">gst_base_transform_is_in_place</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-set-in-place" title="gst_base_transform_set_in_place ()">gst_base_transform_set_in_place</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> in_place</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBaseTransform.html#gst-base-transform-is-qos-enabled" title="gst_base_transform_is_qos_enabled ()">gst_base_transform_is_qos_enabled</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-set-qos-enabled" title="gst_base_transform_set_qos_enabled ()">gst_base_transform_set_qos_enabled</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-update-qos" title="gst_base_transform_update_qos ()">gst_base_transform_update_qos</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> proportion</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> diff</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-set-gap-aware" title="gst_base_transform_set_gap_aware ()">gst_base_transform_set_gap_aware</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> gap_aware</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-suggest" title="gst_base_transform_suggest ()">gst_base_transform_suggest</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBaseTransform.html#gst-base-transform-reconfigure" title="gst_base_transform_reconfigure ()">gst_base_transform_reconfigure</a> (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SINK-NAME:CAPS" title="GST_BASE_TRANSFORM_SINK_NAME">GST_BASE_TRANSFORM_SINK_NAME</a>
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SRC-NAME:CAPS" title="GST_BASE_TRANSFORM_SRC_NAME">GST_BASE_TRANSFORM_SRC_NAME</a>
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SINK-PAD:CAPS" title="GST_BASE_TRANSFORM_SINK_PAD()">GST_BASE_TRANSFORM_SINK_PAD</a> (obj)
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SRC-PAD:CAPS" title="GST_BASE_TRANSFORM_SRC_PAD()">GST_BASE_TRANSFORM_SRC_PAD</a> (obj)
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-FLOW-DROPPED:CAPS" title="GST_BASE_TRANSFORM_FLOW_DROPPED">GST_BASE_TRANSFORM_FLOW_DROPPED</a>
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-LOCK:CAPS" title="GST_BASE_TRANSFORM_LOCK()">GST_BASE_TRANSFORM_LOCK</a> (obj)
#define <a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-UNLOCK:CAPS" title="GST_BASE_TRANSFORM_UNLOCK()">GST_BASE_TRANSFORM_UNLOCK</a> (obj)
</pre>
</div>
<div class="refsect1" title="Object Hierarchy">
<a name="GstBaseTransform.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html">GstObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
+----GstBaseTransform
</pre>
</div>
<div class="refsect1" title="Properties">
<a name="GstBaseTransform.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GstBaseTransform.html#GstBaseTransform--qos" title='The "qos" property'>qos</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
</pre>
</div>
<div class="refsect1" title="Description">
<a name="GstBaseTransform.description"></a><h2>Description</h2>
<p>
This base class is for filter elements that process data.
</p>
<p>
It provides for:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>one sinkpad and one srcpad</p></li>
<li class="listitem"><p>
Possible formats on sink and source pad implemented
with custom transform_caps function. By default uses
same format on sink and source.
</p></li>
<li class="listitem"><p>Handles state changes</p></li>
<li class="listitem"><p>Does flushing</p></li>
<li class="listitem"><p>Push mode</p></li>
<li class="listitem"><p>
Pull mode if the sub-class transform can operate on arbitrary data
</p></li>
</ul></div>
<p>
</p>
<div class="refsect2" title="Use Cases">
<a name="id390784"></a><h3>Use Cases</h3>
<p>
</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<div class="itemizedlist" title="Passthrough mode">
<p class="title"><b>Passthrough mode</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
Element has no interest in modifying the buffer. It may want to inspect it,
in which case the element should have a transform_ip function. If there
is no transform_ip function in passthrough mode, the buffer is pushed
intact.
</p></li>
<li class="listitem"><p>
On the GstBaseTransformClass is the passthrough_on_same_caps variable
which will automatically set/unset passthrough based on whether the
element negotiates the same caps on both pads.
</p></li>
<li class="listitem"><p>
passthrough_on_same_caps on an element that doesn't implement a
transform_caps function is useful for elements that only inspect data
(such as level)
</p></li>
</ul>
</div>
<div class="itemizedlist" title="Example elements">
<p class="title"><b>Example elements</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem">Level</li>
<li class="listitem">Videoscale, audioconvert, ffmpegcolorspace, audioresample in
certain modes.</li>
</ul>
</div>
</li>
<li class="listitem">
<div class="itemizedlist" title="Modifications in-place - input buffer and output buffer are the same thing.">
<p class="title"><b>Modifications in-place - input buffer and output buffer are the
same thing.</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
The element must implement a transform_ip function.
</p></li>
<li class="listitem"><p>
Output buffer size must <= input buffer size
</p></li>
<li class="listitem"><p>
If the always_in_place flag is set, non-writable buffers will be copied
and passed to the transform_ip function, otherwise a new buffer will be
created and the transform function called.
</p></li>
<li class="listitem"><p>
Incoming writable buffers will be passed to the transform_ip function
immediately. </p></li>
<li class="listitem"><p>
only implementing transform_ip and not transform implies always_in_place
= TRUE
</p></li>
</ul>
</div>
<div class="itemizedlist" title="Example elements">
<p class="title"><b>Example elements</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem">Volume</li>
<li class="listitem">Audioconvert in certain modes (signed/unsigned
conversion)</li>
<li class="listitem">ffmpegcolorspace in certain modes (endianness
swapping)</li>
</ul>
</div>
</li>
<li class="listitem">
<div class="itemizedlist" title="Modifications only to the caps/metadata of a buffer">
<p class="title"><b>Modifications only to the caps/metadata of a buffer</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
The element does not require writable data, but non-writable buffers
should be subbuffered so that the meta-information can be replaced.
</p></li>
<li class="listitem"><p>
Elements wishing to operate in this mode should replace the
prepare_output_buffer method to create subbuffers of the input buffer
and set always_in_place to TRUE
</p></li>
</ul>
</div>
<div class="itemizedlist" title="Example elements">
<p class="title"><b>Example elements</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem">Capsfilter when setting caps on outgoing buffers that have
none.</li>
<li class="listitem">identity when it is going to re-timestamp buffers by
datarate.</li>
</ul>
</div>
</li>
<li class="listitem">
<div class="itemizedlist" title="Normal mode">
<p class="title"><b>Normal mode</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
always_in_place flag is not set, or there is no transform_ip function
</p></li>
<li class="listitem"><p>
Element will receive an input buffer and output buffer to operate on.
</p></li>
<li class="listitem"><p>
Output buffer is allocated by calling the prepare_output_buffer function.
</p></li>
</ul>
</div>
<div class="itemizedlist" title="Example elements">
<p class="title"><b>Example elements</b></p>
<ul class="itemizedlist" type="disc"><li class="listitem">Videoscale, ffmpegcolorspace, audioconvert when doing
scaling/conversions</li></ul>
</div>
</li>
<li class="listitem">
<div class="itemizedlist" title="Special output buffer allocations">
<p class="title"><b>Special output buffer allocations</b></p>
<ul class="itemizedlist" type="disc"><li class="listitem"><p>
Elements which need to do special allocation of their output buffers
other than what gst_buffer_pad_alloc allows should implement a
prepare_output_buffer method, which calls the parent implementation and
passes the newly allocated buffer.
</p></li></ul>
</div>
<div class="itemizedlist" title="Example elements">
<p class="title"><b>Example elements</b></p>
<ul class="itemizedlist" type="disc"><li class="listitem">efence</li></ul>
</div>
</li>
</ol></div>
<p>
</p>
</div>
<hr>
<div class="refsect2" title="Sub-class settable flags on GstBaseTransform">
<a name="id390956"></a><h3>Sub-class settable flags on GstBaseTransform</h3>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>
</p>
<div class="itemizedlist" title="passthrough">
<p class="title"><b>passthrough</b></p>
<ul class="itemizedlist" type="circle">
<li class="listitem"><p>
Implies that in the current configuration, the sub-class is not
interested in modifying the buffers.
</p></li>
<li class="listitem"><p>
Elements which are always in passthrough mode whenever the same caps
has been negotiated on both pads can set the class variable
passthrough_on_same_caps to have this behaviour automatically.
</p></li>
</ul>
</div>
<p>
</p>
</li>
<li class="listitem">
<p>
</p>
<div class="itemizedlist" title="always_in_place">
<p class="title"><b>always_in_place</b></p>
<ul class="itemizedlist" type="circle">
<li class="listitem"><p>
Determines whether a non-writable buffer will be copied before passing
to the transform_ip function.
</p></li>
<li class="listitem"><p>
Implied TRUE if no transform function is implemented.
</p></li>
<li class="listitem"><p>
Implied FALSE if ONLY transform function is implemented.
</p></li>
</ul>
</div>
<p>
</p>
</li>
</ul></div>
<p>
</p>
</div>
</div>
<div class="refsect1" title="Details">
<a name="GstBaseTransform.details"></a><h2>Details</h2>
<div class="refsect2" title="GstBaseTransform">
<a name="GstBaseTransform-struct"></a><h3>GstBaseTransform</h3>
<pre class="programlisting">typedef struct _GstBaseTransform GstBaseTransform;</pre>
<p>
The opaque <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> data structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GstBaseTransformClass">
<a name="GstBaseTransformClass"></a><h3>GstBaseTransformClass</h3>
<pre class="programlisting">typedef struct {
GstElementClass parent_class;
/* virtual methods for subclasses */
GstCaps* (*transform_caps) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps);
void (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
gboolean (*transform_size) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps, guint size,
GstCaps *othercaps, guint *othersize);
gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps,
guint *size);
gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
GstCaps *outcaps);
gboolean (*start) (GstBaseTransform *trans);
gboolean (*stop) (GstBaseTransform *trans);
gboolean (*event) (GstBaseTransform *trans, GstEvent *event);
GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
GstBuffer *outbuf);
GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf);
/* FIXME: When adjusting the padding, move these to nicer places in the class */
gboolean passthrough_on_same_caps;
GstFlowReturn (*prepare_output_buffer) (GstBaseTransform * trans,
GstBuffer *input, gint size, GstCaps *caps, GstBuffer **buf);
/* src event */
gboolean (*src_event) (GstBaseTransform *trans, GstEvent *event);
void (*before_transform) (GstBaseTransform *trans, GstBuffer *buffer);
gboolean (*accept_caps) (GstBaseTransform *trans, GstPadDirection direction,
GstCaps *caps);
} GstBaseTransformClass;
</pre>
<p>
Subclasses can override any of the available virtual methods or not, as
needed. At minimum either <em class="parameter"><code>transform</code></em> or <em class="parameter"><code>transform_ip</code></em> need to be overridden.
If the element can overwrite the input data with the results (data is of the
same type and quantity) it should provide <em class="parameter"><code>transform_ip</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html#GstElementClass"><span class="type">GstElementClass</span></a> <em class="structfield"><code><a name="GstBaseTransformClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.transform-caps"></a>transform_caps</code></em> ()</span></p></td>
<td>Optional. Given the pad in this direction and the given
caps, what caps are allowed on the other pad in this
element ?
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.fixate-caps"></a>fixate_caps</code></em> ()</span></p></td>
<td>Optional. Given the pad in this direction and the given
caps, fixate the caps on the other pad.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.transform-size"></a>transform_size</code></em> ()</span></p></td>
<td>Optional. Given the size of a buffer in the given direction
with the given caps, calculate the size in bytes of a buffer
on the other pad with the given other caps.
The default implementation uses get_unit_size and keeps
the number of units the same.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.get-unit-size"></a>get_unit_size</code></em> ()</span></p></td>
<td>Required if the transform is not in-place.
get the size in bytes of one unit for the given caps.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.set-caps"></a>set_caps</code></em> ()</span></p></td>
<td>allows the subclass to be notified of the actual caps set.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.start"></a>start</code></em> ()</span></p></td>
<td>Optional.
Called when the element starts processing.
Allows opening external resources.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.stop"></a>stop</code></em> ()</span></p></td>
<td>Optional.
Called when the element stops processing.
Allows closing external resources.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.event"></a>event</code></em> ()</span></p></td>
<td>Optional.
Event handler on the sink pad. This function should return
TRUE if the base class should forward the event.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.transform"></a>transform</code></em> ()</span></p></td>
<td>Required if the element does not operate in-place.
Transforms one incoming buffer to one outgoing buffer.
The function is allowed to change size/timestamp/duration
of the outgoing buffer.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.transform-ip"></a>transform_ip</code></em> ()</span></p></td>
<td>Required if the element operates in-place.
Transform the incoming buffer in-place.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstBaseTransformClass.passthrough-on-same-caps"></a>passthrough_on_same_caps</code></em>;</span></p></td>
<td>If set to TRUE, passthrough mode will be
automatically enabled if the caps are the same.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.prepare-output-buffer"></a>prepare_output_buffer</code></em> ()</span></p></td>
<td>Optional.
Subclasses can override this to do their own
allocation of output buffers. Elements that only do
analysis can return a subbuffer or even just
increment the reference to the input buffer (if in
passthrough mode)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.src-event"></a>src_event</code></em> ()</span></p></td>
<td>Optional.
Event handler on the source pad.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.before-transform"></a>before_transform</code></em> ()</span></p></td>
<td>Optional. Since 0.10.22
This method is called right before the base class will
start processing. Dynamic properties or other delayed
configuration could be performed in this method.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBaseTransformClass.accept-caps"></a>accept_caps</code></em> ()</span></p></td>
<td>Optional. Since 0.10.30
Subclasses can override this method to check if <em class="parameter"><code>caps</code></em> can be
handled by the element. The default implementation might not be
the most optimal way to check this in all cases.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_is_passthrough ()">
<a name="gst-base-transform-is-passthrough"></a><h3>gst_base_transform_is_passthrough ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_base_transform_is_passthrough (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
<p>
See if <em class="parameter"><code>trans</code></em> is configured as a passthrough transform.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>the <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> to query
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE is the transform is configured in passthrough mode.
MT safe.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_set_passthrough ()">
<a name="gst-base-transform-set-passthrough"></a><h3>gst_base_transform_set_passthrough ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_set_passthrough (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> passthrough</code></em>);</pre>
<p>
Set passthrough mode for this filter by default. This is mostly
useful for filters that do not care about negotiation.
</p>
<p>
Always TRUE for filters which don't implement either a transform
or transform_ip method.
</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>trans</code></em> :</span></p></td>
<td>the <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> to set
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>passthrough</code></em> :</span></p></td>
<td>boolean indicating passthrough mode.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_is_in_place ()">
<a name="gst-base-transform-is-in-place"></a><h3>gst_base_transform_is_in_place ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_base_transform_is_in_place (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
<p>
See if <em class="parameter"><code>trans</code></em> is configured as a in_place transform.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>the <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> to query
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE is the transform is configured in in_place mode.
MT safe.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_set_in_place ()">
<a name="gst-base-transform-set-in-place"></a><h3>gst_base_transform_set_in_place ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_set_in_place (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> in_place</code></em>);</pre>
<p>
Determines whether a non-writable buffer will be copied before passing
to the transform_ip function.
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">Always TRUE if no transform function is implemented.</li>
<li class="listitem">Always FALSE if ONLY transform function is implemented.</li>
</ul></div>
<p>
</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>trans</code></em> :</span></p></td>
<td>the <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> to modify
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in_place</code></em> :</span></p></td>
<td>Boolean value indicating that we would like to operate
on in_place buffers.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_is_qos_enabled ()">
<a name="gst-base-transform-is-qos-enabled"></a><h3>gst_base_transform_is_qos_enabled ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_base_transform_is_qos_enabled (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
<p>
Queries if the transform will handle QoS.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE if QoS is enabled.
MT safe.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.5</p>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_set_qos_enabled ()">
<a name="gst-base-transform-set-qos-enabled"></a><h3>gst_base_transform_set_qos_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_set_qos_enabled (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
<p>
Enable or disable QoS handling in the transform.
</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>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enabled</code></em> :</span></p></td>
<td>new state
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.5</p>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_update_qos ()">
<a name="gst-base-transform-update-qos"></a><h3>gst_base_transform_update_qos ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_update_qos (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> proportion</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> diff</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp</code></em>);</pre>
<p>
Set the QoS parameters in the transform. This function is called internally
when a QOS event is received but subclasses can provide custom information
when needed.
</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>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>proportion</code></em> :</span></p></td>
<td>the proportion
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>diff</code></em> :</span></p></td>
<td>the diff against the clock
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>the timestamp of the buffer generating the QoS expressed in
running_time.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.5</p>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_set_gap_aware ()">
<a name="gst-base-transform-set-gap-aware"></a><h3>gst_base_transform_set_gap_aware ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_set_gap_aware (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> gap_aware</code></em>);</pre>
<p>
If <em class="parameter"><code>gap_aware</code></em> is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> (the default), output buffers will have the
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GST-BUFFER-FLAG-GAP:CAPS"><code class="literal">GST_BUFFER_FLAG_GAP</code></a> flag unset.
</p>
<p>
If set to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the element must handle output buffers with this flag set
correctly, i.e. it can assume that the buffer contains neutral data but must
unset the flag if the output is no neutral 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>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gap_aware</code></em> :</span></p></td>
<td>New state
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.16</p>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_suggest ()">
<a name="gst-base-transform-suggest"></a><h3>gst_base_transform_suggest ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_suggest (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>);</pre>
<p>
Instructs <em class="parameter"><code>trans</code></em> to suggest new <em class="parameter"><code>caps</code></em> upstream. A copy of <em class="parameter"><code>caps</code></em> will be
taken.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>caps to suggest
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>buffer size to suggest
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.21</p>
</div>
<hr>
<div class="refsect2" title="gst_base_transform_reconfigure ()">
<a name="gst-base-transform-reconfigure"></a><h3>gst_base_transform_reconfigure ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_base_transform_reconfigure (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
<p>
Instructs <em class="parameter"><code>trans</code></em> to renegotiate a new downstream transform on the next
buffer. This function is typically called after properties on the transform
were set that influence the output format.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>a <a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.21</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_SINK_NAME">
<a name="GST-BASE-TRANSFORM-SINK-NAME:CAPS"></a><h3>GST_BASE_TRANSFORM_SINK_NAME</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SINK_NAME "sink"
</pre>
<p>
The name of the templates for the sink pad.
</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_SRC_NAME">
<a name="GST-BASE-TRANSFORM-SRC-NAME:CAPS"></a><h3>GST_BASE_TRANSFORM_SRC_NAME</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SRC_NAME "src"
</pre>
<p>
The name of the templates for the source pad.
</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_SINK_PAD()">
<a name="GST-BASE-TRANSFORM-SINK-PAD:CAPS"></a><h3>GST_BASE_TRANSFORM_SINK_PAD()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SINK_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->sinkpad)
</pre>
<p>
Gives the pointer to the sink <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> object of the element.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base transform instance
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.4</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_SRC_PAD()">
<a name="GST-BASE-TRANSFORM-SRC-PAD:CAPS"></a><h3>GST_BASE_TRANSFORM_SRC_PAD()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SRC_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->srcpad)
</pre>
<p>
Gives the pointer to the source <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> object of the element.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base transform instance
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.4</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_FLOW_DROPPED">
<a name="GST-BASE-TRANSFORM-FLOW-DROPPED:CAPS"></a><h3>GST_BASE_TRANSFORM_FLOW_DROPPED</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
</pre>
<p>
A <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> that can be returned from transform and transform_ip to
indicate that no output buffer was generated.
</p>
<p class="since">Since 0.10.13</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_LOCK()">
<a name="GST-BASE-TRANSFORM-LOCK:CAPS"></a><h3>GST_BASE_TRANSFORM_LOCK()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_LOCK(obj) g_mutex_lock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock)
</pre>
<p>
Obtain a lock to protect the transform function from concurrent access.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base transform instance
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.13</p>
</div>
<hr>
<div class="refsect2" title="GST_BASE_TRANSFORM_UNLOCK()">
<a name="GST-BASE-TRANSFORM-UNLOCK:CAPS"></a><h3>GST_BASE_TRANSFORM_UNLOCK()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_UNLOCK(obj) g_mutex_unlock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock)
</pre>
<p>
Release the lock that protects the transform function from concurrent access.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base transform instance
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.13</p>
</div>
</div>
<div class="refsect1" title="Property Details">
<a name="GstBaseTransform.property-details"></a><h2>Property Details</h2>
<div class="refsect2" title='The "qos" property'>
<a name="GstBaseTransform--qos"></a><h3>The <code class="literal">"qos"</code> property</h3>
<pre class="programlisting"> "qos" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write</pre>
<p>Handle Quality-of-Service events.</p>
<p>Default value: FALSE</p>
</div>
</div>
<div class="refsect1" title="See Also">
<a name="GstBaseTransform.see-also"></a><h2>See Also</h2>
<a class="link" href="GstBaseSrc.html" title="GstBaseSrc"><span class="type">GstBaseSrc</span></a>, <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a>
</div>
</div>
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