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Diffstat (limited to 'pwg-other-base.md')
| -rw-r--r-- | pwg-other-base.md | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/pwg-other-base.md b/pwg-other-base.md index bf3cf9f..e23c314 100644 --- a/pwg-other-base.md +++ b/pwg-other-base.md @@ -14,7 +14,7 @@ and doing complex caps negotiation. For this purpose, GStreamer provides base classes that simplify some types of elements. Those base classes will be discussed in this chapter. -# Writing a sink +## Writing a sink Sinks are special elements in GStreamer. This is because sink elements have to take care of *preroll*, which is the process that takes care @@ -71,7 +71,7 @@ The advantages of deriving from `GstBaseSink` are numerous: There are also specialized base classes for audio and video, let's look at those a bit. -## Writing an audio sink +### Writing an audio sink Essentially, audio sink implementations are just a special case of a general sink. An audio sink has the added complexity that it needs to @@ -117,7 +117,7 @@ In addition to implementing the audio base-class virtual functions, derived classes can (should) also implement the `GstBaseSink` `set_caps ()` and `get_caps ()` virtual functions for negotiation. -## Writing a video sink +### Writing a video sink Writing a videosink can be done using the `GstVideoSink` base-class, which derives from `GstBaseSink` internally. Currently, it does nothing @@ -134,7 +134,7 @@ videosink: extensions to videosinks that affect all of them, but only need to be coded once, which is a huge maintenance benefit. -# Writing a source +## Writing a source In the previous part, particularly [Providing random access](pwg-scheduling.md#providing-random-access), we have learned @@ -169,7 +169,7 @@ It is possible to use special memory, such as X server memory pointers or `mmap ()`'ed memory areas, as data pointers in buffers returned from the `create()` virtual function. -## Writing an audio source +### Writing an audio source An audio source is nothing more but a special case of a pushsource. Audio sources would be anything that reads audio, such as a source @@ -192,7 +192,7 @@ on: - New features can be added to it and will apply to all derived classes automatically. -# Writing a transformation element +## Writing a transformation element A third base-class that GStreamer provides is the `GstBaseTransform`. This is a base class for elements with one sourcepad and one sinkpad |