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design: segments: improve introductory note on GST_EVENT_SEGMENT

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+ Some grammar and format improvements
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Reynaldo H. Verdejo Pinochet 2017-02-15 16:20:39 -08:00
parent 24b514fbc5
commit 4fa71e48dd
1 changed files with 5 additions and 5 deletions
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markdown/design/segments.md
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@ -22,8 +22,8 @@ rate.
``` ```
The playback of a segment starts with a source or demuxer element The playback of a segment starts with a source or demuxer element
pushing a segment event containing the start time, stop time and rate of pushing a `SEGMENT` event containing the start time, stop time and rate of
the segment. The purpose of this segment is to inform downstream the segment. The purpose of this event is to inform downstream
elements of the requested segment positions. Some elements might produce elements of the requested segment positions. Some elements might produce
buffers that fall outside of the segment and that might therefore be buffers that fall outside of the segment and that might therefore be
discarded or clipped. discarded or clipped.
@ -65,15 +65,15 @@ keyframe. It then continues to decode and push frames with timestamps >= 1.
When it reaches timestamp 5, it does not decode and push frames anymore. When it reaches timestamp 5, it does not decode and push frames anymore.
The video sink receives a frame of timestamp 1. It takes the start value of The video sink receives a frame of timestamp 1. It takes the start value of
the previous segment and aplies the following (simplified) formula: the previous segment and applies the following (simplified) formula:
``` ```
render_time = BUFFER_TIMESTAMP - segment_start + element->base_time render_time = BUFFER_TIMESTAMP - segment_start + element->base_time
``` ```
It then syncs against the clock with this `render_time`. Note that It then syncs against the clock with this `render_time`. Note that
`BUFFER_TIMESTAMP` is always >= `segment_start` or else it would fall outside of `BUFFER_TIMESTAMP` is always >= `segment_start` or else it would fall outside
the configure segment. of the configure segment.
Videosink reports its current position as (simplified): Videosink reports its current position as (simplified):