avdevice/timefilter: 2nd try at avoiding rounding issues

This hopefully fixes fate-timefilter

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavdevice/timefilter.c

@@ -101,7 +101,7 @@ int main(void)
     for (n0 = 0; n0 < 40; n0 = 2 * n0 + 1) {
         for (n1 = 0; n1 < 10; n1 = 2 * n1 + 1) {
             double best_error = 1000000000;
-            double bestpar0   = 1;
+            double bestpar0   = n0 ? 1 : 100000;
             double bestpar1   = 1;
             int better, i;
 
@@ -118,8 +118,7 @@ int main(void)
                 double par0, par1;
                 better = 0;
                 for (par0 = bestpar0 * 0.8; par0 <= bestpar0 * 1.21; par0 += bestpar0 * 0.05) {
-                    double range = n0 ? 0.8 : 1.0;
+                    for (par1 = bestpar1 * 0.8; par1 <= bestpar1 * 1.21; par1 += bestpar1 * 0.05) {
-                    for (par1 = bestpar1 * range; par1 <= bestpar1 * (2.01 - range); par1 += bestpar1 * 0.05) {
                         double error   = 0;
                         TimeFilter *tf = ff_timefilter_new(1, par0, par1);
                         for (i = 0; i < SAMPLES; i++) {

tests/ref/fate/timefilter

@@ -1,4 +1,4 @@
- [    0.800000    1.000000  0.000000] [ 1689.810931    1.000000  0.000000] [ 2480.175715    1.000000  0.000000] [ 3323.672664    1.000000  0.000000]
+ [80000.000000    0.800000  0.000000] [80000.000000    0.800000  0.000000] [80000.000000    0.800000  0.000000] [80000.000000    0.800000  0.000000]
  [ 1688.672234    0.000000  0.018551] [   21.026792    0.000401  0.068856] [    1.162481    0.008576  0.121287] [    0.803356    0.016078  0.153518]
  [ 1218.378235    0.000000  0.167011] [   12.908626    0.000281  0.296858] [   21.026792    0.000401  0.619608] [    2.064064    0.004760  1.020336]
  [ 1218.378235    0.000000  0.909282] [   10.047626    0.000191  0.873495] [   14.909464    0.000297  1.935407] [   21.026792    0.000401  3.373312]