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video: Add a helper to get the tile size information

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Since the addition of tiling format with subsampled tile size
(NV12_16L32S), getting the tile width/height shifts and tile
size have become more complex. Add a helper to extract and
scale this information for the selected plane and format.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2190>
This commit is contained in:
Nicolas Dufresne 2022-04-12 12:14:03 -04:00 committed by GStreamer Marge Bot
parent 04339c8df5
commit 8fcfc44c15
2 changed files with 66 additions and 0 deletions
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59
subprojects/gst-plugins-base/gst-libs/gst/video/video-format.c
View File

@ -7895,3 +7895,62 @@ gst_video_make_raw_caps_with_features (const GstVideoFormat formats[],
return caps; return caps;
} }
static void
scale_tile_shifts (const GstVideoFormatInfo * finfo, gint plane, guint * ws,
guint * hs)
{
gint comp[GST_VIDEO_MAX_COMPONENTS];
gint i;
gst_video_format_info_component (finfo, plane, comp);
/* scale the tile size according to the subsampling */
*ws -= finfo->w_sub[comp[0]];
*hs -= finfo->h_sub[comp[0]];
/* for each additional component in the same plane, double the tile width,
* this should provide the appropriate tile size when the tile size varies
* base on the subsampling. */
for (i = 1; i < GST_VIDEO_MAX_COMPONENTS && comp[i] >= 0; i++)
*ws += 1;
}
/**
* gst_video_format_info_get_tile_sizes:
* @finfo: #GstVideoFormatInfo
* @plane: The plane to read the tile sizes for.
* @out_ws: (nullable): Set to the scaled tile width shift
* @out_hs: (nullable): Set to the scaled tile height shift
*
* This function will read the width and height tile dimension shifts from
* @info and scale it according to the tiling type and @plane. The results
* will written into @out_hs and @out_ws. It also computes the size of a tile
* in bytes.
*
* Returns: The size of a tile in bytes.
*
* Since: 1.22
*/
guint
gst_video_format_info_get_tile_sizes (const GstVideoFormatInfo * finfo,
guint plane, guint * out_ws, guint * out_hs)
{
guint ws, hs;
g_return_val_if_fail (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo), 0);
ws = GST_VIDEO_FORMAT_INFO_TILE_WS (finfo);
hs = GST_VIDEO_FORMAT_INFO_TILE_HS (finfo);
if (GST_VIDEO_FORMAT_INFO_HAS_SUBTILES (finfo))
scale_tile_shifts (finfo, plane, &ws, &hs);
if (out_ws)
*out_ws = ws;
if (out_hs)
*out_hs = hs;
return 1 << (ws + hs);
}

7
subprojects/gst-plugins-base/gst-libs/gst/video/video-format.h
View File

@ -861,6 +861,13 @@ GST_VIDEO_API
GstCaps * gst_video_make_raw_caps_with_features (const GstVideoFormat formats[], guint len, GstCaps * gst_video_make_raw_caps_with_features (const GstVideoFormat formats[], guint len,
GstCapsFeatures * features); GstCapsFeatures * features);
GST_VIDEO_API
guint gst_video_format_info_get_tile_sizes (const GstVideoFormatInfo * finfo,
guint plane,
guint * out_ws, guint * out_hs);
G_END_DECLS G_END_DECLS
#endif /* __GST_VIDEO_FORMAT_H__ */ #endif /* __GST_VIDEO_FORMAT_H__ */