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videotimecode: Fix false positive coverity issues

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They are false positive overflows, because coverity doesn't realize that
hours <= 24, minutes < 60 and seconds < 60 in all functions. Also casting the
number 60 (seconds in minute, minutes in hour) to guint64 for the
calculations, in order to avoid overflowing once we allow more than 24-hour
timecodes.

CIDs #1371459, #1371458
This commit is contained in:
Vivia Nikolaidou 2016-08-19 15:29:13 +03:00 committed by Sebastian Dröge
parent 2ebbd1c9fa
commit 41c9f0b9dc
1 changed files with 20 additions and 10 deletions
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30
gst-libs/gst/video/gstvideotimecode.c
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@ -293,10 +293,17 @@ gst_video_time_code_add_frames (GstVideoTimeCode * tc, gint64 frames)
guint64 h_new, min_new, sec_new, frames_new;
gdouble ff;
guint ff_nom;
/* This allows for better readability than putting G_GUINT64_CONSTANT(60)
* into a long calculation line */
const guint64 sixty = 60;
/* formulas found in SMPTE ST 2059-1:2015 section 9.4.3
* and adapted for 60/1.001 as well as 30/1.001 */
g_return_if_fail (gst_video_time_code_is_valid (tc));
g_assert (tc->hours <= 24);
g_assert (tc->minutes < 60);
g_assert (tc->seconds < 60);
g_assert (tc->frames <= tc->config.fps_n / tc->config.fps_d);
gst_util_fraction_to_double (tc->config.fps_n, tc->config.fps_d, &ff);
if (tc->config.fps_d == 1001) {
@ -336,10 +343,11 @@ gst_video_time_code_add_frames (GstVideoTimeCode * tc, gint64 frames)
(ff_hours * tc->hours);
h_notmod24 = gst_util_uint64_scale_int (framecount, 1, ff_hours);
min_new_denom = 60 * ff_nom;
min_new_denom = sixty * ff_nom;
min_new_tmp1 = (framecount - (h_notmod24 * ff_hours)) / min_new_denom;
min_new_tmp2 = framecount + dropframe_multiplier * min_new_tmp1;
min_new_tmp1 = (framecount - (h_notmod24 * ff_hours)) / (60 * 10 * ff_nom);
min_new_tmp1 =
(framecount - (h_notmod24 * ff_hours)) / (sixty * 10 * ff_nom);
min_new_tmp3 =
dropframe_multiplier * min_new_tmp1 + (h_notmod24 * ff_hours);
min_new =
@ -357,17 +365,19 @@ gst_video_time_code_add_frames (GstVideoTimeCode * tc, gint64 frames)
(ff_hours * h_notmod24);
} else {
framecount =
frames + tc->frames + (ff_nom * (tc->seconds + (60 * (tc->minutes +
(60 * tc->hours)))));
h_notmod24 = gst_util_uint64_scale_int (framecount, 1, ff_nom * 3600);
frames + tc->frames + (ff_nom * (tc->seconds + (sixty * (tc->minutes +
(sixty * tc->hours)))));
h_notmod24 =
gst_util_uint64_scale_int (framecount, 1, ff_nom * sixty * sixty);
min_new =
gst_util_uint64_scale_int ((framecount - (ff_nom * 3600 * h_notmod24)),
1, (ff_nom * 60));
gst_util_uint64_scale_int ((framecount -
(ff_nom * sixty * sixty * h_notmod24)), 1, (ff_nom * sixty));
sec_new =
gst_util_uint64_scale_int ((framecount - (ff_nom * 60 * (min_new +
(60 * h_notmod24)))), 1, ff_nom);
gst_util_uint64_scale_int ((framecount - (ff_nom * sixty * (min_new +
(sixty * h_notmod24)))), 1, ff_nom);
frames_new =
framecount - (ff_nom * (sec_new + 60 * (min_new + (60 * h_notmod24))));
framecount - (ff_nom * (sec_new + sixty * (min_new +
(sixty * h_notmod24))));
if (frames_new > ff_nom)
frames_new = 0;
}