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design: stream-selection: missing markup and formatting fixes

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Reynaldo H. Verdejo Pinochet 2017-06-02 14:57:45 -07:00
parent 8084a45563
commit b3b501e183
1 changed files with 23 additions and 20 deletions
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markdown/design/stream-selection.md
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@ -99,13 +99,14 @@ Stream selection in GStreamer is implemented in several parts:
## GstStream objects
```
API:
```
GstStream
gst_stream_new(..)
gst_stream_get_\*(...)
gst_stream_set_\*()
gst_stream_new(...)
gst_stream_get_*(...)
gst_stream_set_*(...)
gst_event_set_stream(...)
gst_event_parse_stream(...)
```
@ -130,16 +131,17 @@ The various properties of a `GstStream` object are:
elements already using the notion of stream (which is common for
example in demuxers).
Elements that create GstStream should also set it on the
Elements that create `GstStream` should also set it on the
`GST_EVENT_STREAM_START` event of the relevant pad. This helps
downstream elements to have all information in one location.
## Exposing collections of streams
```
API:
```
GstStreamCollection
gst_stream_collection_new(...)
gst_stream_collection_add_stream(...)
gst_stream_collection_get_size(...)
@ -154,7 +156,7 @@ gst_event_parse_stream_collection(...)
Elements that create new streams (such as demuxers) or can create
new streams (like the HLS/DASH alternative streams) can list the
streams they can make available with the GstStreamCollection object.
streams they can make available with the `GstStreamCollection` object.
Other elements that might generate `GstStreamCollections` are the
DVD-VM, which handles internal switching of tracks, or parsebin and
@ -202,11 +204,11 @@ referencing problems.
### Usage from elements
When a demuxer knows the list of streams it can expose, it
creates a new GstStream for each stream it can provide with the
creates a new `GstStream` for each stream it can provide with the
appropriate information (stream id, flag, tags, caps, ...).
The demuxer then creates a GstStreamCollection object in which it
will put the list of GstStream it can expose. That collection is
The demuxer then creates a `GstStreamCollection` object in which it
will put the list of `GstStream` it can expose. That collection is
then both posted on the bus (via a `GST_MESSAGE_COLLECTION`) and on
each pad (via a `GST_EVENT_STREAM_COLLECTION`).
@ -244,9 +246,10 @@ element even if it doesn't implement the `GstStreamCollection` usage.
## Stream selection event
```
API:
```
GST_EVENT_SELECT_STREAMS
gst_event_new_select_streams(...)
gst_event_parse_select_streams(...)
@ -315,7 +318,7 @@ pre-roll before a pipeline is completely linked down to sinks.
This is an example of how decodebin3 works by using the
above-mentioned objects/events/messages.
For clarity/completeness, we will consider a mpeg-ts stream that has
For clarity/completeness, we will consider a MPEG-TS stream that has
multiple audio streams. Furthermore that stream might have changes
at some point (switching video codec, or adding/removing audio
streams).
@ -462,10 +465,10 @@ through the same pad as the previous video stream in a gapless fashion.
##### HLS alternates
There is a main (multi-bitrate or not) stream with audio and
video interleaved in mpeg-ts. The manifest also indicates the
video interleaved in MPEG-TS. The manifest also indicates the
presence of alternate language audio-only streams.
HLS would expose one collection containing:
1) The main A+V CONTAINER stream (mpeg-ts), initially active,
1) The main A+V CONTAINER stream (MPEG-TS), initially active,
downloaded and exposed as a pad
2) The alternate A-only streams, initially inactive and not exposed as pads
the tsdemux element connected to the first stream will also expose
@ -504,7 +507,7 @@ default english one.
#### multi-program MPEG-TS
Assuming the case of a mpeg-ts stream which contains multiple
Assuming the case of a MPEG-TS stream which contains multiple
programs.
There would be three "levels" of collection:
1) The collection of programs presents in the stream