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video: Add API to parse the image orientation from a GstTagList

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1088>
This commit is contained in:
Olivier Crête 2021-05-04 15:50:59 -04:00 committed by GStreamer Marge Bot
parent a51509c6e7
commit c898ffceeb
2 changed files with 54 additions and 0 deletions
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49
subprojects/gst-plugins-base/gst-libs/gst/video/video.c
View file

@ -237,3 +237,52 @@ gst_video_orientation_method_get_type (void)
return (GType) video_orientation_method_type;
}
/**
* gst_video_orientation_from_tag:
* @taglist: A #GstTagList
* @method: The location where to return the orientation.
*
* Parses the "image-orientation" tag and transforms it into the
* #GstVideoOrientationMethod enum.
*
* Returns: TRUE if there was a valid "image-orientation" tag in the taglist.
*
* Since: 1.20
*/
gboolean
gst_video_orientation_from_tag (GstTagList * taglist,
GstVideoOrientationMethod * method)
{
gchar *orientation;
gboolean ret = TRUE;
g_return_val_if_fail (GST_IS_TAG_LIST (taglist), FALSE);
g_return_val_if_fail (method != NULL, FALSE);
if (!gst_tag_list_get_string (taglist, "image-orientation", &orientation))
return FALSE;
if (!g_strcmp0 ("rotate-0", orientation))
*method = GST_VIDEO_ORIENTATION_IDENTITY;
else if (!g_strcmp0 ("rotate-90", orientation))
*method = GST_VIDEO_ORIENTATION_90R;
else if (!g_strcmp0 ("rotate-180", orientation))
*method = GST_VIDEO_ORIENTATION_180;
else if (!g_strcmp0 ("rotate-270", orientation))
*method = GST_VIDEO_ORIENTATION_90L;
else if (!g_strcmp0 ("flip-rotate-0", orientation))
*method = GST_VIDEO_ORIENTATION_HORIZ;
else if (!g_strcmp0 ("flip-rotate-90", orientation))
*method = GST_VIDEO_ORIENTATION_UR_LL;
else if (!g_strcmp0 ("flip-rotate-180", orientation))
*method = GST_VIDEO_ORIENTATION_VERT;
else if (!g_strcmp0 ("flip-rotate-270", orientation))
*method = GST_VIDEO_ORIENTATION_UL_LR;
else
ret = FALSE;
g_free (orientation);
return ret;
}

5
subprojects/gst-plugins-base/gst-libs/gst/video/video.h
View file

@ -172,6 +172,11 @@ GstSample * gst_video_convert_sample (GstSample * sample,
GstClockTime timeout,
GError ** error);
GST_VIDEO_API
gboolean gst_video_orientation_from_tag (GstTagList * taglist,
GstVideoOrientationMethod * method);
G_END_DECLS
#include <gst/video/colorbalancechannel.h>