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pad: add gst_pad_get_stream_id() utility function

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API: gst_pad_get_stream_id()
This commit is contained in:
Tim-Philipp Müller 2013-01-19 12:51:56 +00:00
parent c015b70456
commit c0926dc7cc
5 changed files with 54 additions and 0 deletions
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2
docs/gst/gstreamer-sections.txt
View file

@ -1772,6 +1772,8 @@ gst_pad_create_stream_id
gst_pad_create_stream_id_printf
gst_pad_create_stream_id_printf_valist
gst_pad_get_stream_id
GstPadForwardFunction
gst_pad_forward
<SUBSECTION Core>

40
gst/gstutils.c
View file

@ -3707,3 +3707,43 @@ gst_pad_create_stream_id (GstPad * pad, GstElement * parent,
{
return gst_pad_create_stream_id_printf (pad, parent, stream_id, NULL);
}
/**
* gst_pad_get_stream_id:
* @pad: A source #GstPad
*
* Returns the current stream-id for the @pad, or %NULL if none has been
* set yet, i.e. the pad has not received a stream-start event yet.
*
* This is a convenience wrapper around gst_pad_get_sticky_event() and
* gst_event_parse_stream_start().
*
* The returned stream-id string should be treated as an opaque string, its
* contents should not be interpreted.
*
* Returns: a newly-allocated copy of the stream-idfor @pad, or %NULL.
* g_free() the returned string when no longer needed.
*
* Since: 1.2
*/
gchar *
gst_pad_get_stream_id (GstPad * pad)
{
const gchar *stream_id = NULL;
GstEvent *event;
gchar *ret = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
event = gst_pad_get_sticky_event (pad, GST_EVENT_STREAM_START, 0);
if (event != NULL) {
gst_event_parse_stream_start (event, &stream_id);
ret = g_strdup (stream_id);
gst_event_unref (event);
GST_LOG_OBJECT (pad, "pad has stream-id '%s'", ret);
} else {
GST_DEBUG_OBJECT (pad, "pad has not received a stream-start event yet");
}
return ret;
}

2
gst/gstutils.h
View file

@ -892,6 +892,8 @@ gchar * gst_pad_create_stream_id (GstPad * pad, Gs
gchar * gst_pad_create_stream_id_printf (GstPad * pad, GstElement * parent, const gchar *stream_id, ...);
gchar * gst_pad_create_stream_id_printf_valist (GstPad * pad, GstElement * parent, const gchar *stream_id, va_list var_args);
gchar * gst_pad_get_stream_id (GstPad * pad);
/* bin functions */
void gst_bin_add_many (GstBin *bin, GstElement *element_1, ...) G_GNUC_NULL_TERMINATED;
void gst_bin_remove_many (GstBin *bin, GstElement *element_1, ...) G_GNUC_NULL_TERMINATED;

9
tests/check/gst/gstpad.c
View file

@ -1479,15 +1479,24 @@ GST_START_TEST (test_sticky_events)
GstPad *srcpad, *sinkpad;
GstCaps *caps;
GstSegment seg;
gchar *id;
/* make unlinked srcpad */
srcpad = gst_pad_new ("src", GST_PAD_SRC);
fail_unless (srcpad != NULL);
gst_pad_set_active (srcpad, TRUE);
/* test stream-start */
fail_unless (gst_pad_get_stream_id (srcpad) == NULL);
/* push an event, it should be sticky on the srcpad */
gst_pad_push_event (srcpad, gst_event_new_stream_start ("test"));
/* let's see if it stuck */
id = gst_pad_get_stream_id (srcpad);
fail_unless_equals_string (id, "test");
g_free (id);
/* make a caps event */
caps = gst_caps_new_empty_simple ("foo/bar");
gst_pad_push_event (srcpad, gst_event_new_caps (caps));

1
win32/common/libgstreamer.def
View file

@ -680,6 +680,7 @@ EXPORTS
gst_pad_get_peer
gst_pad_get_range
gst_pad_get_sticky_event
gst_pad_get_stream_id
gst_pad_get_type
gst_pad_has_current_caps
gst_pad_is_active