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Add util method for scaling a clocktime by a fraction. Useful implementation is left as an exercise for the reader.

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Original commit message from CVS:
* gst/gstutils.c: (gst_util_clocktime_scale):
* gst/gstutils.h:
* docs/gst/gstreamer-sections.txt:
Add util method for scaling a clocktime by a fraction. Useful
implementation is left as an exercise for the reader.
This commit is contained in:
Michael Smith 2005-11-22 15:15:53 +00:00
parent 2e248d331c
commit 4a36e535e9
4 changed files with 28 additions and 0 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2005-11-22 Michael Smith <msmith@fluendo.com>
* gst/gstutils.c: (gst_util_clocktime_scale):
* gst/gstutils.h:
* docs/gst/gstreamer-sections.txt:
Add util method for scaling a clocktime by a fraction. Useful
implementation is left as an exercise for the reader.
2005-11-22 Jan Schmidt <thaytan@mad.scientist.com>
* gst/gstvalue.c: (gst_value_collect_fraction_range):

1
docs/gst/gstreamer-sections.txt
View file

@ -2060,6 +2060,7 @@ gst_guint64_to_gdouble
gst_gdouble_to_guint64
gst_util_dump_mem
gst_util_uint64_scale
gst_util_clocktime_scale
gst_util_set_object_arg
gst_util_set_value_from_string
<SUBSECTION Private>

17
gst/gstutils.c
View file

@ -358,6 +358,23 @@ gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
((gst_guint64_to_gdouble (num)) / gst_guint64_to_gdouble (denom)));
}
/**
* gst_util_clocktime_scale:
* @val: GstClockTime to scale.
* @num: numerator of the scale factor.
* @denum: denominator of the scale factor.
*
* Scale a clocktime by a factor expressed as a fraction (num/denom), avoiding
* overflows and loss of precision.
*
* Returns: @val * @num / @denom, avoiding overflow and loss of precision
*/
GstClockTime
gst_util_clocktime_scale (GstClockTime val, gint num, gint denom)
{
return val * num / denom;
}
/* -----------------------------------------------------
*
* The following code will be moved out of the main

2
gst/gstutils.h
View file

@ -43,6 +43,8 @@ gdouble gst_guint64_to_gdouble (guint64 value);
guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom);
GstClockTime gst_util_clocktime_scale (GstClockTime val, gint num, gint denom);
void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
void gst_print_element_args (GString *buf, gint indent, GstElement *element);