fate: add tests for psnr and ssim filter

Metadata filter output is passed through an Awk script comparing floats
against reference values with specified "fuzz" tolerance to account for
architectural differences (e.g. x86-32 vs. x86-64).

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/tests/refcmp-metadata.awk b/tests/refcmp-metadata.awk
new file mode 100644
index 0000000000..fa21aad0e0
--- /dev/null
+++ b/tests/refcmp-metadata.awk
@@ -0,0 +1,64 @@
+# Compare metadata filter output containing float value strings to reference
+# output data. Returns the whole reference data if delta of each value is below
+# threshold, else returns the whole input data.
+
+function abs(val) {
+    return ((val < 0.0) ? -val : val);
+}
+
+function max(val1, val2) {
+    return ((val1 >= val2) ? val1 : val2);
+}
+
+function is_numeric_str(str) {
+    return (str ~ /^[+-]?[0-9]*\.?[0-9]+$/);
+}
+
+BEGIN {
+    FS = "=";
+    # check for "fuzz" (threshold) program parameter, else use default
+    if (fuzz <= 0.0) {
+        fuzz = 0.1;
+    }
+    # check for "ref" (reference file) program parameter
+    if (ref) {
+        ref_nr = 0;
+        while ((getline line < ref) > 0) {
+            ref_nr++;
+            ref_lines[ref_nr] = line;
+            if (split(line, fields) == 2 && is_numeric_str(fields[2])) {
+                ref_keys[ref_nr] = fields[1];
+                ref_vals[ref_nr] = fields[2] + 0;  # convert to number
+            }
+        }
+        close(ref);
+    }
+    delta_max = 0;
+    result = (ref ? 1 : 0);
+}
+
+{
+    cmp_lines[NR] = $0;
+    if (NF == 2 && is_numeric_str($2) && ref_vals[NR]) {
+        val = $2 + 0;  # convert to number
+        delta = abs((val / ref_vals[NR]) - 1);
+        delta_max = max(delta_max, delta);
+        result = result && ($1 == ref_keys[NR]) && (delta <= fuzz);
+    } else {
+        result = result && ($0 == ref_lines[NR]);
+    }
+}
+
+END {
+    if (result) {
+        for (i = 1; i <= ref_nr; i++)
+            print ref_lines[i];
+    } else {
+        for (i = 1; i <= NR; i++)
+            print cmp_lines[i];
+        if (NR != ref_nr)
+            print "[refcmp] lines: " NR " != " ref_nr > "/dev/stderr";
+        if (delta_max >= fuzz)
+            print "[refcmp] delta_max: " delta_max " >= " fuzz > "/dev/stderr";
+    }
+}