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video-info: improve GST_CAPS_FEATURE_FORMAT_INTERLACED documentation

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Copied the description from gst-doc written by Tim.

Fix #606
This commit is contained in:
Guillaume Desmottes 2019-11-13 15:28:20 +05:30
parent a41bad561a
commit 8a3d901d8f
1 changed files with 13 additions and 2 deletions
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15
gst-libs/gst/video/video-info.h
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@ -33,8 +33,19 @@ typedef struct _GstVideoInfo GstVideoInfo;
/**
* GST_CAPS_FEATURE_FORMAT_INTERLACED:
*
* Name of the caps feature indicating that the stream is interlaced. Currently
* it is only used for video.
* Name of the caps feature indicating that the stream is interlaced.
*
* Currently it is only used for video with 'interlace-mode=alternate'
* to ensure backwards compatibility for this new mode.
* In this mode each buffer carries a single field of interlaced video.
* @GST_VIDEO_BUFFER_FLAG_TOP_FIELD and @GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD
* indicate whether the buffer carries a top or bottom field. The order of
* buffers/fields in the stream and the timestamps on the buffers indicate the
* temporal order of the fields.
* Top and bottom fields are expected to alternate in this mode.
* The frame rate in the caps still signals the frame rate, so the notional field
* rate will be twice the frame rate from the caps
* (see @GST_VIDEO_INFO_FIELD_RATE_N).
*
* Since: 1.16.
*/