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Use gst_element_get_request_pad() instead of doing it complicated by first getting the pad template

Browse source 
Also use the correct pad template name for tee in the docs so that it
actually works.
This commit is contained in:
Sebastian Dröge 2017-08-16 21:33:17 +03:00
parent 66698184c6
commit 1a9f0541be
4 changed files with 18 additions and 30 deletions
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6
examples/tutorials/basic-tutorial-7.c
View file

@ -5,7 +5,6 @@ int main(int argc, char *argv[]) {
GstElement *video_queue, *visual, *video_convert, *video_sink;
GstBus *bus;
GstMessage *msg;
GstPadTemplate *tee_src_pad_template;
GstPad *tee_audio_pad, *tee_video_pad;
GstPad *queue_audio_pad, *queue_video_pad;
@ -49,11 +48,10 @@ int main(int argc, char *argv[]) {
}
/* Manually link the Tee, which has "Request" pads */
tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (tee), "src_%u");
tee_audio_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_audio_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
tee_video_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_video_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||

8
examples/tutorials/basic-tutorial-8.c
View file

@ -118,7 +118,6 @@ static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
int main(int argc, char *argv[]) {
CustomData data;
GstPadTemplate *tee_src_pad_template;
GstPad *tee_audio_pad, *tee_video_pad, *tee_app_pad;
GstPad *queue_audio_pad, *queue_video_pad, *queue_app_pad;
GstAudioInfo info;
@ -187,14 +186,13 @@ int main(int argc, char *argv[]) {
}
/* Manually link the Tee, which has "Request" pads */
tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (data.tee), "src_%u");
tee_audio_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_audio_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (data.audio_queue, "sink");
tee_video_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_video_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (data.video_queue, "sink");
tee_app_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_app_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for app branch.\n", gst_pad_get_name (tee_app_pad));
queue_app_pad = gst_element_get_static_pad (data.app_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||

26
markdown/tutorials/basic/multithreading-and-pad-availability.md
View file

@ -92,7 +92,6 @@ int main(int argc, char *argv[]) {
GstElement *video_queue, *visual, *video_convert, *video_sink;
GstBus *bus;
GstMessage *msg;
GstPadTemplate *tee_src_pad_template;
GstPad *tee_audio_pad, *tee_video_pad;
GstPad *queue_audio_pad, *queue_video_pad;
@ -136,11 +135,10 @@ int main(int argc, char *argv[]) {
}
/* Manually link the Tee, which has "Request" pads */
tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (tee), "src_%d");
tee_audio_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_audio_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
tee_video_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_video_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
@ -257,11 +255,10 @@ comment says).
``` c
/* Manually link the Tee, which has "Request" pads */
tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (tee), "src_%d");
tee_audio_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_audio_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
tee_video_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
tee_video_pad = gst_element_get_request_pad (tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
@ -276,15 +273,12 @@ gst_object_unref (queue_video_pad);
To link Request Pads, they need to be obtained by “requesting” them to
the element. An element might be able to produce different kinds of
Request Pads, so, when requesting them, the desired Pad Template must be
provided. Pad templates are obtained with
`gst_element_class_get_pad_template()` and are identified by their name.
Request Pads, so, when requesting them, the desired Pad Template name must be
provided.
In the documentation for the `tee` element we see that it has two pad
templates named “sink” (for its sink Pads) and “src_%d” (for the Request
Pads).
Once we have the Pad template, we request two Pads from the tee (for the
audio and video branches) with `gst_element_request_pad()`.
templates named “sink” (for its sink Pads) and “src_%u” (for the Request
Pads). We request two Pads from the tee (for the
audio and video branches) with `gst_element_get_request_pad()`.
We then obtain the Pads from the downstream elements to which these
Request Pads need to be linked. These are normal Always Pads, so we
@ -320,7 +314,7 @@ it still needs to be unreferenced (freed) with `gst_object_unref()`.
`queue` elements.
- What is a Request Pad and how to link elements with request pads,
with `gst_element_class_get_pad_template()`, `gst_element_request_pad()`, `gst_pad_link()` and
with `gst_element_get_request_pad()`, `gst_pad_link()` and
`gst_element_release_request_pad()`.
- How to have the same stream available in different branches by using

8
markdown/tutorials/basic/short-cutting-the-pipeline.md
View file

@ -210,7 +210,6 @@ static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
int main(int argc, char *argv[]) {
CustomData data;
GstPadTemplate *tee_src_pad_template;
GstPad *tee_audio_pad, *tee_video_pad, *tee_app_pad;
GstPad *queue_audio_pad, *queue_video_pad, *queue_app_pad;
GstAudioInfo info;
@ -280,14 +279,13 @@ int main(int argc, char *argv[]) {
}
/* Manually link the Tee, which has "Request" pads */
tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (data.tee), "src_%d");
tee_audio_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_audio_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (data.audio_queue, "sink");
tee_video_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_video_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (data.video_queue, "sink");
tee_app_pad = gst_element_request_pad (data.tee, tee_src_pad_template, NULL, NULL);
tee_app_pad = gst_element_get_request_pad (data.tee, "src_%u");
g_print ("Obtained request pad %s for app branch.\n", gst_pad_get_name (tee_app_pad));
queue_app_pad = gst_element_get_static_pad (data.app_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||