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docs: syntax in event handling example in chainfn.md

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Signed-off-by: cadubentzen <cadubentzen@gmail.com>

https://bugzilla.gnome.org/show_bug.cgi?id=788023
This commit is contained in:
cadubentzen 2017-09-21 16:56:14 -03:00 committed by Mathieu Duponchelle
parent 020bf14d03
commit 6fa607b01c
1 changed files with 45 additions and 43 deletions
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88
markdown/plugin-development/basics/chainfn.md
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@ -52,57 +52,59 @@ want to additionally specify an event handling function, which will be
called when stream-events are sent (such as caps, end-of-stream,
newsegment, tags, etc.).
static void
gst_my_filter_init (GstMyFilter * filter)
{
[..]
gst_pad_set_event_function (filter->sinkpad,
gst_my_filter_sink_event);
[..]
}
```c
static void
gst_my_filter_init (GstMyFilter * filter)
{
[..]
gst_pad_set_event_function (filter->sinkpad,
gst_my_filter_sink_event);
[..]
}
static gboolean
gst_my_filter_sink_event (GstPad *pad,
GstObject *parent,
GstEvent *event)
{
GstMyFilter *filter = GST_MY_FILTER (parent);
static gboolean
gst_my_filter_sink_event (GstPad *pad,
GstObject *parent,
GstEvent *event)
{
GstMyFilter *filter = GST_MY_FILTER (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
/* we should handle the format here */
break;
case GST_EVENT_EOS:
/* end-of-stream, we should close down all stream leftovers here */
gst_my_filter_stop_processing (filter);
break;
default:
break;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
/* we should handle the format here */
break;
case GST_EVENT_EOS:
/* end-of-stream, we should close down all stream leftovers here */
gst_my_filter_stop_processing (filter);
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
return gst_pad_event_default (pad, parent, event);
}
static GstFlowReturn
gst_my_filter_chain (GstPad *pad,
GstObject *parent,
GstBuffer *buf)
{
GstMyFilter *filter = GST_MY_FILTER (parent);
GstBuffer *outbuf;
static GstFlowReturn
gst_my_filter_chain (GstPad *pad,
GstObject *parent,
GstBuffer *buf)
{
GstMyFilter *filter = GST_MY_FILTER (parent);
GstBuffer *outbuf;
outbuf = gst_my_filter_process_data (filter, buf);
gst_buffer_unref (buf);
if (!outbuf) {
/* something went wrong - signal an error */
GST_ELEMENT_ERROR (GST_ELEMENT (filter), STREAM, FAILED, (NULL), (NULL));
return GST_FLOW_ERROR;
}
outbuf = gst_my_filter_process_data (filter, buf);
gst_buffer_unref (buf);
if (!outbuf) {
/* something went wrong - signal an error */
GST_ELEMENT_ERROR (GST_ELEMENT (filter), STREAM, FAILED, (NULL), (NULL));
return GST_FLOW_ERROR;
}
return gst_pad_push (filter->srcpad, outbuf);
}
return gst_pad_push (filter->srcpad, outbuf);
}
```
In some cases, it might be useful for an element to have control over
the input data rate, too. In that case, you probably want to write a