mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-28 19:20:35 +00:00
Remove clutter tutorial
This commit is contained in:
Olivier Crête
parent
0a973622a9
commit
ce0a42f39a
3 changed files with 0 additions and 257 deletions
1
TODO.md
1
TODO.md
|
|
@ -16,7 +16,6 @@ Pages to review:
|
|||
- sdk-basic-tutorial-streaming.md
|
||||
- sdk-basic-tutorial-playback-speed.md
|
||||
- sdk-basic-tutorial-handy-elements.md
|
||||
- sdk-basic-tutorial-clutter-integration.md
|
||||
- sdk-basic-tutorial-platform-specific-elements.md
|
||||
- sdk-playback-tutorials.md
|
||||
- sdk-playback-tutorial-subtitle-management.md
|
||||
|
|
|
|||
|
|
@ -1,255 +0,0 @@
|
|||
# Basic tutorial 15: Clutter integration
|
||||
|
||||
> 
|
||||
>
|
||||
> **THIS TUTORIAL HAS NOT BEEN UPDATED, CLUTTER IS DEPRECATED, DON'T USE IT**
|
||||
|
||||
|
||||
# Goal
|
||||
|
||||
“[Clutter](https://clutter-project.org/) is an open source software
|
||||
library for creating fast, compelling, portable, and dynamic graphical
|
||||
user interfaces”. GStreamer can be integrated into Clutter through the
|
||||
`cluttersink` element, allowing video to be used as a texture. This
|
||||
tutorial shows:
|
||||
|
||||
- How to use the video output of a GStreamer pipeline as a texture in
|
||||
Clutter.
|
||||
|
||||
# Introduction
|
||||
|
||||
The process to link GStreamer with Clutter is actually very simple. A `
|
||||
cluttersink `element must be instantiated (or, better,
|
||||
`autocluttersink`, if available) and used as the video sink. Through the
|
||||
`texture` property this element accepts a Clutter texture, which is
|
||||
automatically updated by GStreamer.
|
||||
|
||||
# A 3D media player
|
||||
|
||||
Copy this code into a text file named `basic-tutorial-15.c`..
|
||||
|
||||
<table>
|
||||
<tbody>
|
||||
<tr class="odd">
|
||||
<td><img src="images/icons/emoticons/information.png" width="16" height="16" /></td>
|
||||
<td><p>This tutorial is included in the SDK since release 2012.9. If you cannot find it in the downloaded code, please install the latest release of the GStreamer SDK.</p></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
|
||||
**basic-tutorial-15.c**
|
||||
|
||||
``` c
|
||||
#include <clutter-gst/clutter-gst.h>
|
||||
|
||||
/* Setup the video texture once its size is known */
|
||||
void size_change (ClutterActor *texture, gint width, gint height, gpointer user_data) {
|
||||
ClutterActor *stage;
|
||||
gfloat new_x, new_y, new_width, new_height;
|
||||
gfloat stage_width, stage_height;
|
||||
ClutterAnimation *animation = NULL;
|
||||
|
||||
stage = clutter_actor_get_stage (texture);
|
||||
if (stage == NULL)
|
||||
return;
|
||||
|
||||
clutter_actor_get_size (stage, &stage_width, &stage_height);
|
||||
|
||||
/* Center video on window and calculate new size preserving aspect ratio */
|
||||
new_height = (height * stage_width) / width;
|
||||
if (new_height <= stage_height) {
|
||||
new_width = stage_width;
|
||||
|
||||
new_x = 0;
|
||||
new_y = (stage_height - new_height) / 2;
|
||||
} else {
|
||||
new_width = (width * stage_height) / height;
|
||||
new_height = stage_height;
|
||||
|
||||
new_x = (stage_width - new_width) / 2;
|
||||
new_y = 0;
|
||||
}
|
||||
clutter_actor_set_position (texture, new_x, new_y);
|
||||
clutter_actor_set_size (texture, new_width, new_height);
|
||||
clutter_actor_set_rotation (texture, CLUTTER_Y_AXIS, 0.0, stage_width / 2, 0, 0);
|
||||
/* Animate it */
|
||||
animation = clutter_actor_animate (texture, CLUTTER_LINEAR, 10000, "rotation-angle-y", 360.0, NULL);
|
||||
clutter_animation_set_loop (animation, TRUE);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
GstElement *pipeline, *sink;
|
||||
ClutterTimeline *timeline;
|
||||
ClutterActor *stage, *texture;
|
||||
|
||||
/* clutter-gst takes care of initializing Clutter and GStreamer */
|
||||
if (clutter_gst_init (&argc, &argv) != CLUTTER_INIT_SUCCESS) {
|
||||
g_error ("Failed to initialize clutter\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
stage = clutter_stage_get_default ();
|
||||
|
||||
/* Make a timeline */
|
||||
timeline = clutter_timeline_new (1000);
|
||||
g_object_set(timeline, "loop", TRUE, NULL);
|
||||
|
||||
/* Create new texture and disable slicing so the video is properly mapped onto it */
|
||||
texture = CLUTTER_ACTOR (g_object_new (CLUTTER_TYPE_TEXTURE, "disable-slicing", TRUE, NULL));
|
||||
g_signal_connect (texture, "size-change", G_CALLBACK (size_change), NULL);
|
||||
|
||||
/* Build the GStreamer pipeline */
|
||||
pipeline = gst_parse_launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
|
||||
|
||||
/* Instantiate the Clutter sink */
|
||||
sink = gst_element_factory_make ("autocluttersink", NULL);
|
||||
if (sink == NULL) {
|
||||
/* Revert to the older cluttersink, in case autocluttersink was not found */
|
||||
sink = gst_element_factory_make ("cluttersink", NULL);
|
||||
}
|
||||
if (sink == NULL) {
|
||||
g_printerr ("Unable to find a Clutter sink.\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Link GStreamer with Clutter by passing the Clutter texture to the Clutter sink*/
|
||||
g_object_set (sink, "texture", texture, NULL);
|
||||
|
||||
/* Add the Clutter sink to the pipeline */
|
||||
g_object_set (pipeline, "video-sink", sink, NULL);
|
||||
|
||||
/* Start playing */
|
||||
gst_element_set_state (pipeline, GST_STATE_PLAYING);
|
||||
|
||||
/* start the timeline */
|
||||
clutter_timeline_start (timeline);
|
||||
|
||||
/* Add texture to the stage, and show it */
|
||||
clutter_group_add (CLUTTER_GROUP (stage), texture);
|
||||
clutter_actor_show_all (stage);
|
||||
|
||||
clutter_main();
|
||||
|
||||
/* Free resources */
|
||||
gst_element_set_state (pipeline, GST_STATE_NULL);
|
||||
gst_object_unref (pipeline);
|
||||
return 0;
|
||||
}
|
||||
```
|
||||
|
||||
<table>
|
||||
<tbody>
|
||||
<tr class="odd">
|
||||
<td><img src="images/icons/emoticons/information.png" width="16" height="16" /></td>
|
||||
<td><div id="expander-1303246949" class="expand-container">
|
||||
<div id="expander-control-1303246949" class="expand-control">
|
||||
<span class="expand-control-icon"><img src="images/icons/grey_arrow_down.gif" class="expand-control-image" /></span><span class="expand-control-text">Need help? (Click to expand)</span>
|
||||
</div>
|
||||
<div id="expander-content-1303246949" class="expand-content">
|
||||
<p>If you need help to compile this code, refer to the <strong>Building the tutorials</strong> section for your platform: <a href="Installing%2Bon%2BLinux.html#InstallingonLinux-Build">Linux</a>, <a href="Installing%2Bon%2BMac%2BOS%2BX.html#InstallingonMacOSX-Build">Mac OS X</a> or <a href="Installing%2Bon%2BWindows.html#InstallingonWindows-Build">Windows</a>, or use this specific command on Linux:</p>
|
||||
<div class="panel" style="border-width: 1px;">
|
||||
<div class="panelContent">
|
||||
<p><code>gcc basic-tutorial-15.c -o basic-tutorial-15 `pkg-config --cflags --libs clutter-gst-1.0 gstreamer-1.0`</code></p>
|
||||
</div>
|
||||
</div>
|
||||
<p>If you need help to run this code, refer to the <strong>Running the tutorials</strong> section for your platform: <a href="Installing%2Bon%2BLinux.html#InstallingonLinux-Run">Linux</a>, <a href="Installing%2Bon%2BMac%2BOS%2BX.html#InstallingonMacOSX-Run">Mac OS X</a> or <a href="Installing%2Bon%2BWindows.html#InstallingonWindows-Run">Windows</a></p>
|
||||
<p><span>This tutorial opens a window and displays a movie <span>on a revolving plane</span>, with accompanying audio. The media is fetched from the Internet, so the window might take a few seconds to appear, depending on your connection speed.</span></p>
|
||||
<p>Required libraries: <code>clutter-gst-1.0 gstreamer-1.0</code></p>
|
||||
</div>
|
||||
</div></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
|
||||
# Walkthrough
|
||||
|
||||
It is not the purpose of this tutorial to teach how to use Clutter, but
|
||||
how to integrate GStreamer with it. This is accomplished through the
|
||||
clutter-gst library, so its header must be included (and the program
|
||||
must link against it):
|
||||
|
||||
``` c
|
||||
#include <clutter-gst/clutter-gst.h>
|
||||
```
|
||||
|
||||
The first thing this library does is initialize both GStreamer and
|
||||
Clutter, so you must call ` clutter-gst-init()` instead of initializing
|
||||
these libraries yourself.
|
||||
|
||||
``` c
|
||||
/* clutter-gst takes care of initializing Clutter and GStreamer */
|
||||
if (clutter_gst_init (&argc, &argv) != CLUTTER_INIT_SUCCESS) {
|
||||
g_error ("Failed to initialize clutter\n");
|
||||
return -1;
|
||||
}
|
||||
```
|
||||
|
||||
The GStreamer video is to be played on a Clutter texture, so, we need to
|
||||
create a texture. Just remember to disable texture slicing to allow for
|
||||
proper
|
||||
integration:
|
||||
|
||||
``` c
|
||||
/* Create new texture and disable slicing so the video is properly mapped onto it */
|
||||
texture = CLUTTER_ACTOR (g_object_new (CLUTTER_TYPE_TEXTURE, "disable-slicing", TRUE, NULL));
|
||||
g_signal_connect (texture, "size-change", G_CALLBACK (size_change), NULL);
|
||||
```
|
||||
|
||||
We connect to the size-change signal so we can perform final setup once
|
||||
the video size is known.
|
||||
|
||||
``` c
|
||||
/* Instantiate the Clutter sink */
|
||||
sink = gst_element_factory_make ("autocluttersink", NULL);
|
||||
if (sink == NULL) {
|
||||
/* Revert to the older cluttersink, in case autocluttersink was not found */
|
||||
sink = gst_element_factory_make ("cluttersink", NULL);
|
||||
}
|
||||
if (sink == NULL) {
|
||||
g_printerr ("Unable to find a Clutter sink.\n");
|
||||
return -1;
|
||||
}
|
||||
```
|
||||
|
||||
The proper Clutter sink element to instantiate for GStreamer is
|
||||
`autocluttersink`, which works more or less like `autovideosink`, trying
|
||||
to find the best Clutter sink available. However, `autocluttersink` (for
|
||||
which there is no documentation yet) is only available since the 2012.7
|
||||
release of the SDK, so, if it cannot be found, the
|
||||
simpler `cluttersink` element is created
|
||||
instead.
|
||||
|
||||
``` c
|
||||
/* Link GStreamer with Clutter by passing the Clutter texture to the Clutter sink*/
|
||||
g_object_set (sink, "texture", texture, NULL);
|
||||
```
|
||||
|
||||
This texture is everything GStreamer needs to know about Clutter.
|
||||
|
||||
``` c
|
||||
/* Add the Clutter sink to the pipeline */
|
||||
g_object_set (pipeline, "video-sink", sink, NULL);
|
||||
```
|
||||
|
||||
Finally, tell `playbin` to use the sink we created instead of the
|
||||
default one.
|
||||
|
||||
Then the GStreamer pipeline and the Clutter timeline are started and the
|
||||
ball starts rolling. Once the pipeline has received enough information
|
||||
to know the video size (width and height), the Clutter texture gets
|
||||
updated and we receive a notification, handled in the
|
||||
`size_change` callback. This method sets the texture to the proper
|
||||
size, centers it on the output window and starts a revolving animation,
|
||||
just for demonstration purposes. But this has nothing to do with
|
||||
GStreamer.
|
||||
|
||||
# Conclusion
|
||||
|
||||
This tutorial has shown:
|
||||
|
||||
- How to use the video output of a GStreamer pipeline as a Clutter
|
||||
texture using the ` cluttersink` or `autocluttersink` elements.
|
||||
- How to link GStreamer and Clutter through the `texture` property of
|
||||
` cluttersink` or `autocluttersink`.
|
||||
|
||||
It has been a pleasure having you here, and see you soon\!
|
||||
|
|
@ -21,7 +21,6 @@ index.md
|
|||
sdk-basic-tutorial-streaming.md
|
||||
sdk-basic-tutorial-playback-speed.md
|
||||
sdk-basic-tutorial-handy-elements.md
|
||||
sdk-basic-tutorial-clutter-integration.md
|
||||
sdk-basic-tutorial-platform-specific-elements.md
|
||||
sdk-playback-tutorials.md
|
||||
sdk-playback-tutorial-playbin-usage.md
|
||||
|
|
|
|||
Loading…
Reference in a new issue