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More docs (most of them just empty...)

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Original commit message from CVS:
More docs (most of them just empty...)
Added automatic pad plugging.
Added automatic dynamic pad plugging.
Changed some codecs to correctly set their pad types.
This commit is contained in:
Wim Taymans 2000-08-22 21:18:18 +00:00
parent 3cff190b74
commit a703c01d94
19 changed files with 736 additions and 32 deletions
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318
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<chapter id="cha-advanced">
<title>Threads</title>
<para>
The small application we created in the previous chapter used the
concept of a factory to create the elements. In this chapter we will
show you how to use the factory concepts.
</para>
<sect1>
<title>The problems with the helloworld example</title>
<para>
If we take a look at how the elements were created in the previous
example we used a rather crude mechanism:
</para>
<programlisting>
...
/* now it's time to get the parser */
parse = gst_elementfactory_make("mp3parse","parse");
decoder = gst_elementfactory_make("mpg123","decoder");
...
</programlisting>
<para>
While this mechanism is quite effective it also has one big problems:
The elements are created base on their name. Indeed, we create an
element mpg123 by explicitly stating the mpg123 elements name.
Our little program therefore always uses the mpg123 decoder element
to decode the MP3 audio stream, even if there are 3 other MP3 decoders
in the system. We will see how we can use a more general way to create
an MP3 decoder element.
</para>
<para>
We have to introduce the concept of MIME types added to the source and
sink pads.
</para>
</sect1>
<sect1>
<title>MIME Types</title>
<para>
GStreamer uses MIME types to indentify the different types of data
that can be handled by the elements. They are the high level
mechanisms to make sure that everyone is talking about the right
kind of data.
</para>
<para>
A MIME (Multipurpose Internet Mail Extension) types are a set of
string that donote a certain type of data. examples include:
<itemizedlist>
<listitem>
<para>
audio/raw : raw audio samples
</para>
</listitem>
<listitem>
<para>
audio/mpeg : mpeg audio
</para>
</listitem>
<listitem>
<para>
video/mpeg : mpeg video
</para>
</listitem>
</itemizedlist>
</para>
<para>
An element must associate a MIME type to its source and sink pads
when it is loaded into the system. GStreamer knows about the
different elements and what type of data they expect and emit.
This allows for very dynamic and extensible element creation as we
will see.
</para>
<para>
In our helloworld example the elements we constructed would have the
following MIME types associated with their source and sink pads:
</para>
<para>
We will see how you can create an element based on the MIME types
of its source and sink pads. This way the end-user will have the
ability to choose his/her favorite audio/mpeg decoder without
you even having to care about it.
</para>
<para>
The typing of the source and sink pads also makes it possible to
'autoplug' a pipeline. We will have the ability to say: "construct
me a pipeline that does an audio/mpeg to audio/raw conversion".
</para>
<note>
<para>
The basic GStreamer library does not try to solve all of your
autoplug problems. It leaves the hard decisions to the application
programmer, where they belong.
</para>
</note>
</sect1>
<sect1>
<title>GStreamer types</title>
<para>
GStreamer assigns a unique number to all registered MIME types. It
also maintains a list of all elements that either uses this type
as a source or as a sink. GStreamer also keeps a reference to
a function that can be used to determine if a given buffer is of
the given MIME type.
</para>
<para>
There is also an association between a MIME type and a file
extension.
</para>
<para>
The type information is maintained in a list of
<classname>GstType</classname>. The definition of a
<classname>GstType</classname> is like:
</para>
<programlisting>
typedef gboolean (*GstTypeFindFunc) (GstBuffer *buf,gpointer *priv);
typedef struct _GstType GstType;
struct _GstType {
guint16 id; /* type id (assigned) */
gchar *mime; /* MIME type */
gchar *exts; /* space-delimited list of extensions */
GstTypeFindFunc typefindfunc; /* typefind function */
GList *srcs; /* list of src objects for this type */
GList *sinks; /* list of sink objects for type */
};
</programlisting>
<para>
All operations on <classname>GstType</classname> occur via their
<classname>guint16 id</classname> numbers, with <classname>GstType</classname>
structure private to the GStreamer library.
</para>
<sect2>
<title>MIME type to id conversion</title>
<para>
We can obtain the id for a given MIME type
with the following piece of code:
</para>
<programlisting>
guint16 id;
id = gst_type_find_by_mime("audio/mpeg");
</programlisting>
<para>
This function will return 0 if the type was not known.
</para>
</sect2>
<sect2>
<title>id to <classname>GstType</classname> conversion</title>
<para>
We can obtain the <classname>GstType</classname> for a given id
with the following piece of code:
</para>
<programlisting>
GstType *type;
type = gst_type_find_by_id(id);
</programlisting>
<para>
This function will return NULL if the id was associated with
any known <classname>GstType</classname>
</para>
</sect2>
<sect2>
<title>extension to id conversion</title>
<para>
We can obtain the id for a given file extension
with the following piece of code:
</para>
<programlisting>
guint16 id;
id = gst_type_find_by_ext(".mp3");
</programlisting>
<para>
This function will return 0 if the extension was not known.
</para>
</sect2>
<sect2>
<title>id to <classname>GstElementFactory</classname> conversion</title>
<para>
When we have obtained a given type id using one of the above methods,
we can obtain a list of all the elements that operate on this MIME
type or extension.
</para>
<para>
Obtain a list of all the elements that use this id as source with:
</para>
<programlisting>
GList *list;
list = gst_type_gst_srcs(id);
</programlisting>
<para>
Obtain a list of all the elements that use this id as sink with:
</para>
<programlisting>
GList *list;
list = gst_type_gst_sinks(id);
</programlisting>
<para>
When you have a list of elements, you can simply take the first
element of the list to obtain an appropriate element.
</para>
<note>
<para>
As you can see, there might be a multitude of elements that
are able to operate on video/raw types. some might include:
<itemizedlist>
<listitem>
<para>
an MP3 audio encoder.
</para>
</listitem>
<listitem>
<para>
an audio sink.
</para>
</listitem>
<listitem>
<para>
an audio resampler.
</para>
</listitem>
<listitem>
<para>
a spectrum filter.
</para>
</listitem>
</itemizedlist>
Depending on the application, you might want to use a different
element. This is why GStreamer leaves that decision up to the
application programmer.
</para>
</note>
</sect2>
<sect2>
<title>id to id path detection</title>
<para>
You can obtain a <classname>GList</classname> of elements that
will transform the source id into the destination id.
</para>
<programlisting>
GList *list;
list = gst_type_gst_sink_to_src(sourceid, sinkid);
</programlisting>
<para>
This piece of code will give you the elements needed to construct
a path from sourceid to sinkid. This function is mainly used in
autoplugging the pipeline.
</para>
</sect2>
</sect1>
<sect1>
<title>creating elements with the factory</title>
<para>
In the previous section we described how you could obtain
an element factory using MIME types. One the factory has been
obtained, you can create an element using:
</para>
<programlisting>
GstElementFactory *factory;
GstElement *element;
// obtain the factory
factory = ...
element = gst_elementfactory_create(factory, "name");
</programlisting>
<para>
This way, you do not have to create elements by name which
allows the end-user to select the elements he/she prefers for the
given MIME types.
</para>
</sect1>
<sect1>
<title>GStreamer basic types</title>
<para>
GStreamer only has two builtin types:
</para>
<itemizedlist>
<listitem>
<para>
audio/raw : raw audio samples
</para>
</listitem>
<listitem>
<para>
video/raw and image/raw : raw video data
</para>
</listitem>
</itemizedlist>
<para>
All other MIME types are maintained by the plugin elements.
</para>
</sect1>
</chapter>

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<chapter id="cha-cothreads">
<title>Cothreads</title>
<para>
</para>
</chapter>

6
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<chapter id="cha-dynamic">
<title>Dynamic pipelines</title>
<para>
</para>
</chapter>

51
docs/manual/factories.sgml
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@ -3,9 +3,14 @@
<para> <para>
The small application we created in the previous chapter used the The small application we created in the previous chapter used the
concept of a factory to create the elements. In this chapter we will concept of a factory to create the elements. In this chapter we will
show you how to use the factory concepts. show you how to use the factory concepts to create elements based
on what they do instead of how they are called.
</para> </para>
<para>
We will first explain the concepts involved before we move on
to the reworked helloworld example using autoplugging.
</para>
<sect1> <sect1>
<title>The problems with the helloworld example</title> <title>The problems with the helloworld example</title>
<para> <para>
@ -194,7 +199,7 @@ struct _GstType {
</sect2> </sect2>
<sect2> <sect2>
<title>id to <classname>GstElement</classname> conversion</title> <title>id to <classname>GstElementFactory</classname> conversion</title>
<para> <para>
When we have obtained a given type id using one of the above methods, When we have obtained a given type id using one of the above methods,
we can obtain a list of all the elements that operate on this MIME we can obtain a list of all the elements that operate on this MIME
@ -254,7 +259,49 @@ struct _GstType {
</note> </note>
</sect2> </sect2>
<sect2>
<title>id to id path detection</title>
<para>
You can obtain a <classname>GList</classname> of elements that
will transform the source id into the destination id.
</para>
<programlisting>
GList *list;
list = gst_type_gst_sink_to_src(sourceid, sinkid);
</programlisting>
<para>
This piece of code will give you the elements needed to construct
a path from sourceid to sinkid. This function is mainly used in
autoplugging the pipeline.
</para>
</sect2>
</sect1> </sect1>
<sect1>
<title>creating elements with the factory</title>
<para>
In the previous section we described how you could obtain
an element factory using MIME types. One the factory has been
obtained, you can create an element using:
</para>
<programlisting>
GstElementFactory *factory;
GstElement *element;
// obtain the factory
factory = ...
element = gst_elementfactory_create(factory, "name");
</programlisting>
<para>
This way, you do not have to create elements by name which
allows the end-user to select the elements he/she prefers for the
given MIME types.
</para>
</sect1>
<sect1> <sect1>
<title>GStreamer basic types</title> <title>GStreamer basic types</title>
<para> <para>

6
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<chapter id="cha-ghostpads">
<title>Ghostpads</title>
<para>
</para>
</chapter>

47
docs/manual/gstreamer-manual.sgml
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@ -11,8 +11,20 @@
<!ENTITY HELLOWORLD SYSTEM "helloworld.sgml"> <!ENTITY HELLOWORLD SYSTEM "helloworld.sgml">
<!ENTITY FACTORIES SYSTEM "factories.sgml"> <!ENTITY FACTORIES SYSTEM "factories.sgml">
]> <!ENTITY HELLOWORLD2 SYSTEM "helloworld2.sgml">
<!ENTITY THREADS SYSTEM "threads.sgml">
<!ENTITY QUEUES SYSTEM "queues.sgml">
<!ENTITY COTHREADS SYSTEM "cothreads.sgml">
<!ENTITY DYNAMIC SYSTEM "dynamic.sgml">
<!ENTITY GHOSTPADS SYSTEM "ghostpads.sgml">
<!ENTITY TYPEDETECTION SYSTEM "typedetection.sgml">
<!ENTITY UTILITY SYSTEM "utility.sgml">
<!ENTITY XML SYSTEM "xml.sgml">
<!ENTITY PLUGINS SYSTEM "plugins.sgml">
<!ENTITY PROGRAMS SYSTEM "programs.sgml">
]>
<book id="GStreamer"> <book id="GStreamer">
<bookinfo> <bookinfo>
@ -110,6 +122,7 @@
&FACTORIES; &FACTORIES;
&HELLOWORLD2;
</part> </part>
<!-- ############ Advanced GStreamer - part ############# --> <!-- ############ Advanced GStreamer - part ############# -->
@ -118,10 +131,27 @@
<partintro> <partintro>
<para> <para>
Wanna know more? In this part we will cover the more advanced features of GStreamer.
With the basics you learned in the prevous part you should be
able to create a 'simple' pipeline. If you want more control over
the media types and the pipeline you should use the more
low-level features of GStreamer.
</para> </para>
</partintro> </partintro>
&THREADS;
&QUEUES;
&COTHREADS;
&DYNAMIC;
&GHOSTPADS;
&TYPEDETECTION;
&UTILITY;
</part> </part>
<!-- ############ XML in GStreamer - part ############# --> <!-- ############ XML in GStreamer - part ############# -->
@ -130,10 +160,13 @@
<partintro> <partintro>
<para> <para>
Just say how we use it... GStreamer has the posibility to externalize the pipelines
you create using an XML format. You can load a previously
created pipeline by loading the XML file.
</para> </para>
</partintro> </partintro>
&XML;
</part> </part>
<!-- ############ XML in GStreamer - part ############# --> <!-- ############ XML in GStreamer - part ############# -->
@ -142,10 +175,12 @@
<partintro> <partintro>
<para> <para>
A lot of text will follow... In this part we will describe how you create a new plugin
to be used in GStreamer.
</para> </para>
</partintro> </partintro>
&PLUGINS;
</part> </part>
<!-- ############ Appendices - part ############# --> <!-- ############ Appendices - part ############# -->
@ -155,8 +190,12 @@
<partintro> <partintro>
<para> <para>
GStreamer comes prepackaged with a few programs.
</para> </para>
</partintro> </partintro>
&PROGRAMS;
</part> </part>
</book> </book>

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<chapter id="cha-hello2">
<title>Your second application</title>
<para>
In the previous chapter we created a first version of the helloworld
application. We then explained a better way of creating the elements
using factories identified by MIME types.
</para>
<para>
In this chapter we will introduce you to autoplugging. Using the MIME
types of the elements GStreamer can automatically create a pipeline
for you.
</para>
<sect1>
<title>Autoplugging helloworld</title>
<para>
We will create a second version of the helloworld application using
autoplugging. Its source code is considerably more easy to write and
can also much more data types.
</para>
<programlisting>
#include &lt;gst/gst.h&gt;
static gboolean playing;
/* eos will be called when the src element has an end os stream */
void eos(GstSrc *src)
{
g_print("have eos, quitting\n");
playing = FALSE;
}
int main(int argc,char *argv[])
{
GstElement *disksrc, *audiosink;
GstPipeline *pipeline;
if (argc != 2) {
g_print("usage: %s &lt;filename&gt;\n", argv[0]);
exit(-1);
}
gst_init(&amp;argc,&amp;argv);
gst_plugin_load_all();
g_print("\n");
/* create a new bin to hold the elements */
pipeline = gst_pipeline_new("pipeline");
/* create a disk reader */
disksrc = gst_elementfactory_make("disksrc", "disk_source");
gtk_object_set(GTK_OBJECT(disksrc),"location", argv[1],NULL);
gtk_signal_connect(GTK_OBJECT(disksrc),"eos",
GTK_SIGNAL_FUNC(eos),NULL);
/* and an audio sink */
audiosink = gst_elementfactory_make("audiosink", "play_audio");
/* add objects to the main pipeline */
gst_bin_add(GST_BIN(pipeline), disksrc);
gst_bin_add(GST_BIN(pipeline), audiosink);
if (!gst_pipeline_autoplug(pipeline)) {
g_print("unable to handle stream\n");
exit(-1);
}
/* find out how to handle this bin */
gst_bin_create_plan(GST_BIN(pipeline));
/* make it ready */
gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_READY);
/* start playing */
gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_PLAYING);
playing = TRUE;
while (playing) {
gst_bin_iterate(GST_BIN(pipeline));
}
/* stop the bin */
gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_NULL);
gst_pipeline_destroy(pipeline);
exit(0);
}
</programlisting>
<para>
first of all, we do not use any mpg123 or mp3parse element in this example.
In fact, we only specify a source element and a sink element and add them
to a pipeline.
</para>
<para>
The most interesting change however is the following:
</para>
<programlisting>
...
if (!gst_pipeline_autoplug(pipeline)) {
g_print("unable to handle stream\n");
exit(-1);
}
...
</programlisting>
<para>
This piece of code does all the magic.
</para>
<para>
<itemizedlist>
<listitem>
<para>
The source and the sink elements will be found inside the pipeline
</para>
</listitem>
<listitem>
<para>
Since the source has no type, a typedetection will be started on
the source element.
</para>
</listitem>
<listitem>
<para>
The best set of elements that connect the MIME type of the source
element to the MIME type of the sink are found.
</para>
</listitem>
<listitem>
<para>
The elements are added to the pipeline and their pads are connected.
</para>
</listitem>
</itemizedlist>
</para>
<para>
After this autoplugging, the pipeline is ready to play. Remember that this
pipeline will be able to playback all of the media types for which an
appropriate plugin exists since the autoplugging is all done using MIME
types.
</para>
<para>
I you really want, you can use the GSteamer components to do the
autoplugging yourself.
</para>
<para>
To compile the helloworld2 example, use:
</para>
<programlisting>
gcc -Wall `gstreamer-config --cflags` `gtk-config --cflags` helloworld2.c \
-o helloworld2 `gstreamer-config --libs` `gtk-config --libs`
</programlisting>
<para>
You can run the example with (substitute helloworld.mp3 with you favorite MP3 file):
</para>
<programlisting>
./helloworld2 helloworld.mp3
</programlisting>
<para>
You can also try to use an AVI or MPEG file as its input. Using autoplugging,
GStreamer will automatically figure out how to handle the stream. Remember that
only the audio part will be played because we have only added an audiosink to
the pipeline.
</para>
<programlisting>
./helloworld2 helloworld.mpeg
</programlisting>
</sect1>
</chapter>

15
docs/manual/outline.txt
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@ -53,6 +53,8 @@ Building apps
MIME types MIME types
GStreamer types GStreamer types
Basic types Basic types
Your second application
advanced concepts advanced concepts
@ -61,24 +63,27 @@ advanced concepts
cothreads cothreads
dynamic pipeline construction dynamic pipeline construction
ghost pads ghost pads
types
type detection type detection
plugin registry
bufferpools
Quality of service
utility functions utility functions
XML in GStreamer XML in GStreamer
(saving) (saving)
(loading a pipeline) (loading a pipeline)
Plugin development Plugin development
plugin types
chain based
loop based
buffers buffers
metadata metadata
subbufers subbufers
adding pads adding pads
libraries libraries
plugin registry
types
type detection
QoS messages
clocks
GStreamer programs GStreamer programs
editor editor

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<chapter id="cha-plugins">
<title>Plugin development</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-programs">
<title>Programs</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-queues">
<title>Queues</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-threads">
<title>Threads</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-typedetection">
<title>Typedetection</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-utility">
<title>Utility functions</title>
<para>
</para>
</chapter>

6
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@ -0,0 +1,6 @@
<chapter id="cha-xml">
<title>XML in GStreamer</title>
<para>
</para>
</chapter>

2
examples/helloworld2/helloworld2.c
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@ -24,8 +24,6 @@ int main(int argc,char *argv[])
gst_plugin_load_all(); gst_plugin_load_all();
g_print("\n"); g_print("\n");
gst_type_dump();
/* create a new bin to hold the elements */ /* create a new bin to hold the elements */
pipeline = gst_pipeline_new("pipeline"); pipeline = gst_pipeline_new("pipeline");

73
gst/gstpipeline.c
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@ -54,6 +54,7 @@ static GstElementStateReturn gst_pipeline_change_state(GstElement *element);
static void gst_pipeline_prepare(GstPipeline *pipeline); static void gst_pipeline_prepare(GstPipeline *pipeline);
static void gst_pipeline_have_type(GstSink *sink, GstSink *sink2, gpointer data); static void gst_pipeline_have_type(GstSink *sink, GstSink *sink2, gpointer data);
static void gst_pipeline_pads_autoplug(GstElement *src, GstElement *sink);
static GstBin *parent_class = NULL; static GstBin *parent_class = NULL;
//static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; //static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 };
@ -160,6 +161,66 @@ static guint16 gst_pipeline_typefind(GstPipeline *pipeline, GstElement *element)
return type_id; return type_id;
} }
static void gst_pipeline_pads_autoplug_func(GstElement *src, GstPad *pad, GstElement *sink) {
GList *sinkpads;
GstPad *sinkpad;
g_print("gstpipeline: autoplug pad connect function type %d\n", pad->type);
sinkpads = gst_element_get_pad_list(sink);
while (sinkpads) {
sinkpad = (GstPad *)sinkpads->data;
// if we have a match, connect the pads
if (sinkpad->type == pad->type && sinkpad->direction == GST_PAD_SINK && !GST_PAD_CONNECTED(sinkpad)) {
gst_pad_connect(pad, sinkpad);
g_print("gstpipeline: autoconnect pad \"%s\" (%d) in element %s <-> ", pad->name, pad->type, gst_element_get_name(src));
g_print("pad \"%s\" (%d) in element %s\n", sinkpad->name, sinkpad->type, gst_element_get_name(sink));
break;
}
sinkpads = g_list_next(sinkpads);
}
}
static void gst_pipeline_pads_autoplug(GstElement *src, GstElement *sink) {
GList *srcpads, *sinkpads;
gboolean connected = FALSE;
srcpads = gst_element_get_pad_list(src);
while (srcpads) {
GstPad *srcpad = (GstPad *)srcpads->data;
GstPad *sinkpad;
if (srcpad->direction == GST_PAD_SRC && !GST_PAD_CONNECTED(srcpad)) {
sinkpads = gst_element_get_pad_list(sink);
// FIXME could O(n) if the types were sorted...
while (sinkpads) {
sinkpad = (GstPad *)sinkpads->data;
// if we have a match, connect the pads
if (sinkpad->type == srcpad->type && sinkpad->direction == GST_PAD_SINK && !GST_PAD_CONNECTED(sinkpad)) {
gst_pad_connect(srcpad, sinkpad);
g_print("gstpipeline: autoconnect pad \"%s\" (%d) in element %s <-> ", srcpad->name, srcpad->type, gst_element_get_name(src));
g_print("pad \"%s\" (%d) in element %s\n", sinkpad->name, sinkpad->type, gst_element_get_name(sink));
connected = TRUE;
goto end;
}
sinkpads = g_list_next(sinkpads);
}
}
srcpads = g_list_next(srcpads);
}
end:
if (!connected) {
g_print("gstpipeline: delaying pad connections\n");
gtk_signal_connect(GTK_OBJECT(src),"new_pad",
GTK_SIGNAL_FUNC(gst_pipeline_pads_autoplug_func), sink);
}
}
gboolean gst_pipeline_autoplug(GstPipeline *pipeline) { gboolean gst_pipeline_autoplug(GstPipeline *pipeline) {
GList *elements; GList *elements;
GstElement *element, *srcelement, *sinkelement; GstElement *element, *srcelement, *sinkelement;
@ -175,7 +236,7 @@ gboolean gst_pipeline_autoplug(GstPipeline *pipeline) {
elements = gst_bin_get_list(GST_BIN(pipeline)); elements = gst_bin_get_list(GST_BIN(pipeline));
// fase 1, find all the sinks and sources... // fase 1, find all the sinks and sources... FIXME need better way to do this...
while (elements) { while (elements) {
element = GST_ELEMENT(elements->data); element = GST_ELEMENT(elements->data);
@ -250,10 +311,7 @@ gboolean gst_pipeline_autoplug(GstPipeline *pipeline) {
element = gst_elementfactory_create(factory, factory->name); element = gst_elementfactory_create(factory, factory->name);
gst_bin_add(GST_BIN(pipeline), element); gst_bin_add(GST_BIN(pipeline), element);
// FIXME match paths to connect with MIME types instead gst_pipeline_pads_autoplug(srcelement, element);
// of names.
gst_pad_connect(gst_element_get_pad(srcelement,"src"),
gst_element_get_pad(element,"sink"));
srcelement = element; srcelement = element;
@ -263,8 +321,7 @@ gboolean gst_pipeline_autoplug(GstPipeline *pipeline) {
} }
if (complete) { if (complete) {
gst_pad_connect(gst_element_get_pad(srcelement,"src"), gst_pipeline_pads_autoplug(srcelement, sinkelement);
gst_element_get_pad(sinkelement,"sink"));
return TRUE; return TRUE;
} }
@ -282,8 +339,6 @@ static GstElementStateReturn gst_pipeline_change_state(GstElement *element) {
switch (GST_STATE_PENDING(pipeline)) { switch (GST_STATE_PENDING(pipeline)) {
case GST_STATE_READY: case GST_STATE_READY:
// we need to set up internal state // we need to set up internal state
g_print("preparing pipeline \"%s\" for iterations:\n",
gst_element_get_name(GST_ELEMENT(element)));
gst_pipeline_prepare(pipeline); gst_pipeline_prepare(pipeline);
break; break;
default: default:

18
gst/gsttype.c
View file

@ -33,6 +33,8 @@
GList *_gst_types; GList *_gst_types;
guint16 _gst_maxtype; guint16 _gst_maxtype;
#define MAX_COST 999999
struct _gst_type_node struct _gst_type_node
{ {
int iNode; int iNode;
@ -302,7 +304,7 @@ static GList *construct_path (gst_type_node *rgnNodes, gint chNode)
GstType *type; GstType *type;
GList *converters; GList *converters;
while (current != 999) while (current != MAX_COST)
{ {
type = gst_type_find_by_id(current); type = gst_type_find_by_id(current);
converters = (GList *)g_hash_table_lookup(type->converters, GUINT_TO_POINTER(src)); converters = (GList *)g_hash_table_lookup(type->converters, GUINT_TO_POINTER(src));
@ -322,7 +324,7 @@ static guint gst_type_find_cost(gint src, gint dest) {
GList *converters = (GList *)g_hash_table_lookup(type->converters, GUINT_TO_POINTER(dest)); GList *converters = (GList *)g_hash_table_lookup(type->converters, GUINT_TO_POINTER(dest));
if (converters) return 1; if (converters) return 1;
return 999; return MAX_COST;
} }
GList *gst_type_get_sink_to_src(guint16 sinkid, guint16 srcid) { GList *gst_type_get_sink_to_src(guint16 sinkid, guint16 srcid) {
@ -339,13 +341,13 @@ GList *gst_type_get_sink_to_src(guint16 sinkid, guint16 srcid) {
for (i=0; i< _gst_maxtype; i++) { for (i=0; i< _gst_maxtype; i++) {
rgnNodes[i].iNode = i; rgnNodes[i].iNode = i;
rgnNodes[i].iDist = 999; rgnNodes[i].iDist = MAX_COST;
rgnNodes[i].iPrev = 999; rgnNodes[i].iPrev = MAX_COST;
} }
rgnNodes[sinkid].iDist = 0; rgnNodes[sinkid].iDist = 0;
rgnNodes[sinkid].iPrev = 999; rgnNodes[sinkid].iPrev = MAX_COST;
queue = gst_type_enqueue(queue, sinkid, 0, 999); queue = gst_type_enqueue(queue, sinkid, 0, MAX_COST);
while (g_list_length(queue) > 0) { while (g_list_length(queue) > 0) {
@ -353,8 +355,8 @@ GList *gst_type_get_sink_to_src(guint16 sinkid, guint16 srcid) {
for (i=0; i< _gst_maxtype; i++) { for (i=0; i< _gst_maxtype; i++) {
iCost = gst_type_find_cost(iNode, i); iCost = gst_type_find_cost(iNode, i);
if (iCost != 999) { if (iCost != MAX_COST) {
if((999 == rgnNodes[i].iDist) || if((MAX_COST == rgnNodes[i].iDist) ||
(rgnNodes[i].iDist > (iCost + iDist))) { (rgnNodes[i].iDist > (iCost + iDist))) {
rgnNodes[i].iDist = iDist + iCost; rgnNodes[i].iDist = iDist + iCost;
rgnNodes[i].iPrev = iNode; rgnNodes[i].iPrev = iNode;

2
tests/old/examples/helloworld2/helloworld2.c
View file

@ -24,8 +24,6 @@ int main(int argc,char *argv[])
gst_plugin_load_all(); gst_plugin_load_all();
g_print("\n"); g_print("\n");
gst_type_dump();
/* create a new bin to hold the elements */ /* create a new bin to hold the elements */
pipeline = gst_pipeline_new("pipeline"); pipeline = gst_pipeline_new("pipeline");