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tests/fate/libavutil: add FATE test for mathematics

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Test the integer math utility functions: av_gcd, av_rescale,
av_rescale_rnd (all rounding modes including PASS_MINMAX),
av_rescale_q, av_compare_ts, av_compare_mod, av_rescale_delta,
and av_add_stable. Includes large-value tests that exercise the
128-bit multiply path in av_rescale_rnd.

av_bessel_i0 is not tested since it uses floating point math
that is not bitexact across platforms.

Coverage for libavutil/mathematics.c: 0.00% -> 82.03%

Remaining uncovered lines are av_bessel_i0 (float, 23 lines)
and one edge case fallback in av_rescale_delta.
This commit is contained in:
marcos ashton
2026-03-31 20:28:31 +01:00
committed by michaelni
parent 66b1dbfb98
commit e18c8c533d
4 changed files with 253 additions and 0 deletions
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4
tests/fate/libavutil.mak
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@@ -116,6 +116,10 @@ FATE_LIBAVUTIL += fate-lfg
fate-lfg: libavutil/tests/lfg$(EXESUF)
fate-lfg: CMD = run libavutil/tests/lfg$(EXESUF)
FATE_LIBAVUTIL += fate-mathematics
fate-mathematics: libavutil/tests/mathematics$(EXESUF)
fate-mathematics: CMD = run libavutil/tests/mathematics$(EXESUF)
FATE_LIBAVUTIL += fate-md5
fate-md5: libavutil/tests/md5$(EXESUF)
fate-md5: CMD = run libavutil/tests/md5$(EXESUF)

73
tests/ref/fate/mathematics Normal file
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@@ -0,0 +1,73 @@
Testing av_gcd()
gcd(0, 0) = 0 OK
gcd(1, 0) = 1 OK
gcd(0, 1) = 1 OK
gcd(6, 4) = 2 OK
gcd(12, 8) = 4 OK
gcd(17, 13) = 1 OK
gcd(100, 75) = 25 OK
gcd(-6, 4) = 2 OK
gcd(6, -4) = 2 OK
Testing av_rescale()
rescale(6, 3, 2) = 9
rescale(0, 3, 2) = 0
rescale(1, 1, 1) = 1
rescale(-6, 3, 2) = -9
rescale(90000, 1, 90000) = 1
Testing av_rescale_rnd()
rescale_rnd(7, 1, 2, 0) = 3 OK
rescale_rnd(7, 1, 2, 1) = 4 OK
rescale_rnd(7, 1, 2, 2) = 3 OK
rescale_rnd(7, 1, 2, 3) = 4 OK
rescale_rnd(7, 1, 2, 5) = 4 OK
rescale_rnd(-7, 1, 2, 0) = -3 OK
rescale_rnd(-7, 1, 2, 1) = -4 OK
rescale_rnd(-7, 1, 2, 2) = -4 OK
rescale_rnd(-7, 1, 2, 3) = -3 OK
rescale_rnd(6, 1, 2, 5) = 3 OK
Testing AV_ROUND_PASS_MINMAX
INT64_MIN passthrough: OK
INT64_MAX passthrough: OK
normal with PASS_MINMAX: 2
Testing large value rescale
rescale(INT64_MAX/2, 2, 1) = 9223372036854775806
rescale(1000000007, 1000000009, 1000000007) = 1000000009
rescale_rnd(10, INT_MAX+1, INT_MAX+1, ZERO) = 10
rescale_rnd(7, 3000000000, 2000000000, NEAR_INF) = 11
Testing av_rescale_q()
rescale_q(90000, 1/90000, 1/1000) = 1000
rescale_q(48000, 1/48000, 1/44100) = 44100
Testing av_compare_ts()
compare(1, 1/1, 1, 1/1) = 0
compare(1, 1/1, 2, 1/1) = -1
compare(2, 1/1, 1, 1/1) = 1
compare(1, 1/1000, 1, 1/90000) = 1
compare(INT64_MAX/2, 1/1, INT64_MAX/3, 1/1) = 1
Testing av_compare_mod()
compare_mod(3, 1, 16) = 2
compare_mod(1, 3, 16) = -2
compare_mod(5, 5, 16) = 0
Testing av_rescale_delta()
delta step 0: 0
delta step 1: 941
delta step 2: 1882
delta step 3: 2822
delta clip 0: 0
delta clip 1: 1920
delta clip 2: 3838
delta clip 3: 5756
Testing av_add_stable()
add_stable(0, 1/1, 1/1000, 500) = 0
add_stable(1000, 1/90000, 1/48000, 1024) = 2920
add_stable(0, 1/48000, 1/90000, 90000) = 48000
add_stable(100, 1/1000, 1/90000, 3000) = 133
add_stable 10000x1024 at 1/48000: 10240000 (expected 10240000) OK