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v4l2src: Use fraction compare util function.

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Use the fraction compare utility to compare function, not the
handcrafted one. The handcrafted one is buggy as it doesn't take into
account rounding error. For example comparing a framerate of 20/1 on a
camera configured as 30/1 fps would yield true: 1 == (1 * 20)/30 and not
re-configure the camera. Fixes #656104
This commit is contained in:
Sjoerd Simons 2011-08-07 12:23:26 +02:00
parent 1438bf26ac
commit 8edb15d12f
1 changed files with 3 additions and 7 deletions
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10
sys/v4l2/v4l2src_calls.c
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@ -202,11 +202,6 @@ too_many_trials:
}
}
/* Note about fraction simplification
* n1/d1 == n2/d2 is also written as n1 == ( n2 * d1 ) / d2
*/
#define fractions_are_equal(n1,d1,n2,d2) ((n1) == gst_util_uint64_scale_int((n2), (d1), (d2)))
/******************************************************
* gst_v4l2src_set_capture():
* set capture parameters
@ -242,8 +237,9 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
}
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (fractions_are_equal (stream.parm.capture.timeperframe.numerator,
stream.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
if (gst_util_fraction_compare (stream.parm.capture.timeperframe.numerator,
stream.parm.capture.timeperframe.denominator, fps_d, fps_n) == 0) {
GST_DEBUG_OBJECT (v4l2src, "Desired framerate already set");
goto already_set;
}