mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-13 12:51:16 +00:00
84 lines
2.1 KiB
Markdown
84 lines
2.1 KiB
Markdown
# Documentation conventions
|
||
|
||
Due to the potential for exponential growth, several abbreviating
|
||
conventions will be used throughout this documentation. These
|
||
conventions have grown primarily from extremely in-depth discussions of
|
||
the architecture in IRC. This has verified the safety of these
|
||
conventions, if used properly. There are no known namespace conflicts as
|
||
long as context is rigorously observed.
|
||
|
||
## Object classes
|
||
|
||
Since everything starts with Gst, we will generally refer to objects by
|
||
the shorter name, i.e. `Element` or `Pad`. These names will always have
|
||
their first letter capitalized.
|
||
|
||
## Function names
|
||
|
||
Within the context of a given object, functions defined in that object’s
|
||
header and/or source file will have their object-specific prefix
|
||
stripped. For instance, `gst_element_add_pad()` would be referred to as
|
||
simply `*add_pad()`. Note that the trailing parentheses should always be
|
||
present, but sometimes may not be. A prefixing underscore (*) will
|
||
always tell you it’s a function, however, regardless of the presence or
|
||
absence of the trailing parentheses.
|
||
|
||
## defines and enums
|
||
|
||
Values and macros defined as enums and preprocessor macros will be
|
||
referred to in all capitals, as per their definition. This includes
|
||
object flags and element states, as well as general enums. Examples are
|
||
the states `NULL`, `READY`, `PLAYING`, and `PAUSED`; the element flags
|
||
`LOCKED_STATE`, and state return values `SUCCESS`, `FAILURE`, and `ASYNC`.
|
||
Where there is a prefix, as in the element flags, it is usually dropped
|
||
and implied. Note however that element flags should be cross-checked
|
||
with the header, as there are currently two conventions in use: with and
|
||
without `*FLAGS*` in the middle.
|
||
|
||
## Drawing conventions
|
||
|
||
When drawing pictures the following conventions apply:
|
||
|
||
### objects
|
||
|
||
Objects are drawn with a box like:
|
||
|
||
```
|
||
+------+
|
||
| |
|
||
+------+
|
||
```
|
||
|
||
### pointers
|
||
|
||
a pointer to an object.
|
||
|
||
```
|
||
+-----+
|
||
*--->| |
|
||
+-----+
|
||
```
|
||
|
||
an invalid pointer, this is a pointer that should not be used.
|
||
|
||
```
|
||
*-//->
|
||
```
|
||
|
||
### elements
|
||
|
||
```
|
||
+----------+
|
||
| name |
|
||
sink src
|
||
+----------+
|
||
```
|
||
|
||
### pad links
|
||
|
||
```
|
||
-----+ +---
|
||
| |
|
||
src--sink
|
||
-----+ +---
|
||
```
|