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gl: add convenience function for the start of a video frame

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Get's the start of the video frame based on a GstVideoInfo and
GstVideoAlignment.
This commit is contained in:
Matthew Waters 2015-12-14 12:26:01 +11:00
parent 3591c6bfa0
commit 51636b451c
2 changed files with 21 additions and 0 deletions
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19
gst-libs/gst/gl/gstglutils.c
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@ -904,6 +904,25 @@ gst_gl_get_plane_data_size (GstVideoInfo * info, GstVideoAlignment * align,
return plane_size; return plane_size;
} }
/* find the difference between the start of the plane and where the video
* data starts in the plane */
gsize
gst_gl_get_plane_start (GstVideoInfo * info, GstVideoAlignment * valign,
guint plane)
{
gsize plane_start;
gint i;
/* find the start of the plane data including padding */
plane_start = 0;
for (i = 0; i < plane; i++) {
plane_start += gst_gl_get_plane_data_size (info, valign, i);
}
/* offset between the plane data start and where the video frame starts */
return (GST_VIDEO_INFO_PLANE_OFFSET (info, plane)) - plane_start;
}
GstCaps * GstCaps *
gst_gl_caps_replace_all_caps_features (const GstCaps * caps, gst_gl_caps_replace_all_caps_features (const GstCaps * caps,
const gchar * feature_name) const gchar * feature_name)

2
gst-libs/gst/gl/gstglutils.h
View File

@ -106,6 +106,8 @@ gboolean gst_gl_run_query (GstElement * element,
GstQuery * query, GstPadDirection direction); GstQuery * query, GstPadDirection direction);
gsize gst_gl_get_plane_data_size (GstVideoInfo * info, GstVideoAlignment * align, gsize gst_gl_get_plane_data_size (GstVideoInfo * info, GstVideoAlignment * align,
guint plane); guint plane);
gsize gst_gl_get_plane_start (GstVideoInfo * info, GstVideoAlignment * valign,
guint plane);
GstCaps * gst_gl_caps_replace_all_caps_features (const GstCaps * caps, GstCaps * gst_gl_caps_replace_all_caps_features (const GstCaps * caps,
const gchar * feature_name); const gchar * feature_name);