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utils: Add gst_util_floor_log2 helper function

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5003>
This commit is contained in:
He Junyan 2024-11-20 15:02:19 +08:00 committed by GStreamer Marge Bot
parent a2e44d94aa
commit df7a0d0fec
2 changed files with 48 additions and 0 deletions
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45
subprojects/gstreamer/gst/gstutils.c
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@ -4518,6 +4518,51 @@ gst_util_ceil_log2 (guint32 v)
return y;
}
/**
* gst_util_floor_log2:
* @v: a #guint32 value.
*
* Returns smallest integral value not bigger than log2(v).
*
* Returns: a computed #guint val.
*
* Since: 1.26
*/
guint
gst_util_floor_log2 (guint32 v)
{
guint32 result = 0;
g_return_val_if_fail (v != 0, -1);
if (v & 0xffff0000) {
v >>= 16;
result += 16;
}
if (v & 0xff00) {
v >>= 8;
result += 8;
}
if (v & 0xf0) {
v >>= 4;
result += 4;
}
if (v & 0xc) {
v >>= 2;
result += 2;
}
if (v & 0x2) {
v >>= 1;
result += 1;
}
return result;
}
/**
* gst_calculate_linear_regression: (skip)
* @xy: Pairs of (x,y) values

3
subprojects/gstreamer/gst/gstutils.h
View file

@ -1243,6 +1243,9 @@ gboolean gst_type_is_plugin_api (GType type, GstPluginAPIFlags *
GST_API
guint gst_util_ceil_log2 (guint32 v);
GST_API
guint gst_util_floor_log2 (guint32 x);
GST_API
gint gst_util_filename_compare (const gchar *a, const gchar *b);