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plugin-development: syntax highlighting in code snippets

Browse source 
Signed-off-by: Carlos Eduardo R. B. Fonseca <cadubentzen@gmail.com>

https://bugzilla.gnome.org/show_bug.cgi?id=788029
This commit is contained in:
Carlos Eduardo R. B. Fonseca 2017-09-21 19:56:34 -03:00 committed by Nicolas Dufresne
parent 6fa607b01c
commit 14193ec3d7
3 changed files with 78 additions and 73 deletions
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56
markdown/plugin-development/advanced/scheduling.md
View file

@ -291,44 +291,46 @@ access:
The following example will show how a `_get_range
()`-function can be implemented in a source element:
#include "filter.h"
static GstFlowReturn
gst_my_filter_get_range (GstPad * pad,
GstObject * parent,
guint64 offset,
guint length,
GstBuffer ** buf);
```c
#include "filter.h"
static GstFlowReturn
gst_my_filter_get_range (GstPad * pad,
GstObject * parent,
guint64 offset,
guint length,
GstBuffer ** buf);
G_DEFINE_TYPE (GstMyFilter, gst_my_filter, GST_TYPE_ELEMENT);
G_DEFINE_TYPE (GstMyFilter, gst_my_filter, GST_TYPE_ELEMENT);
static void
gst_my_filter_init (GstMyFilter * filter)
{
static void
gst_my_filter_init (GstMyFilter * filter)
{
[..]
[..]
gst_pad_set_getrange_function (filter->srcpad,
gst_my_filter_get_range);
gst_pad_set_getrange_function (filter->srcpad,
gst_my_filter_get_range);
[..]
}
[..]
}
static GstFlowReturn
gst_my_filter_get_range (GstPad * pad,
GstObject * parent,
guint64 offset,
guint length,
GstBuffer ** buf)
{
static GstFlowReturn
gst_my_filter_get_range (GstPad * pad,
GstObject * parent,
guint64 offset,
guint length,
GstBuffer ** buf)
{
GstMyFilter *filter = GST_MY_FILTER (parent);
GstMyFilter *filter = GST_MY_FILTER (parent);
[.. here, you would fill *buf ..]
[.. here, you would fill *buf ..]
return GST_FLOW_OK;
}
return GST_FLOW_OK;
}
```
In practice, many elements that could theoretically do random access,
may in practice often be activated in push-mode scheduling anyway, since

26
markdown/plugin-development/basics/boiler.md
View file

@ -262,20 +262,22 @@ a new pad from this template using `gst_pad_new_from_static_template
()`, you will need to declare the pad template as a global variable. More on
this subject in [Specifying the pads][pads].
static GstStaticPadTemplate sink_factory = [..],
src_factory = [..];
```c
static GstStaticPadTemplate sink_factory = [..],
src_factory = [..];
static void
gst_my_filter_class_init (GstMyFilterClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
[..]
static void
gst_my_filter_class_init (GstMyFilterClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
[..]
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
}
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
}
```
The last argument in a template is its type or list of supported types.
In this example, we use 'ANY', which means that this element will accept

69
markdown/plugin-development/basics/states.md
View file

@ -77,49 +77,50 @@ from one state to another.
Do not g\_assert for unhandled state changes; this is taken care of by
the GstElement base class.
static GstStateChangeReturn
gst_my_filter_change_state (GstElement *element, GstStateChange transition);
```c
static GstStateChangeReturn
gst_my_filter_change_state (GstElement *element, GstStateChange transition);
static void
gst_my_filter_class_init (GstMyFilterClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
static void
gst_my_filter_class_init (GstMyFilterClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
element_class->change_state = gst_my_filter_change_state;
}
element_class->change_state = gst_my_filter_change_state;
}
static GstStateChangeReturn
gst_my_filter_change_state (GstElement *element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstMyFilter *filter = GST_MY_FILTER (element);
static GstStateChangeReturn
gst_my_filter_change_state (GstElement *element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstMyFilter *filter = GST_MY_FILTER (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_my_filter_allocate_memory (filter))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_my_filter_allocate_memory (filter))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_my_filter_free_memory (filter);
break;
default:
break;
}
return ret;
}
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_my_filter_free_memory (filter);
break;
default:
break;
}
return ret;
}
```
Note that upwards (NULL=\>READY, READY=\>PAUSED, PAUSED=\>PLAYING) and
downwards (PLAYING=\>PAUSED, PAUSED=\>READY, READY=\>NULL) state changes
are handled in two separate blocks with the downwards state change