[FFmpeg-devel] [PATCHv5] checkasm/lpc: test compute_autocorr

[Rémi Denis-Courmont]

Also restrict length to even values as per (questionable) assumption in
the reference C code.
---
 tests/checkasm/lpc.c | 59 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 56 insertions(+), 3 deletions(-)

diff --git a/tests/checkasm/lpc.c b/tests/checkasm/lpc.c
index 592e34c03d..f9f3d84080 100644
--- a/tests/checkasm/lpc.c
+++ b/tests/checkasm/lpc.c
@@ -16,6 +16,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "libavutil/avassert.h"
 #include "libavutil/mem_internal.h"
 
 #include "libavcodec/lpc.h"
@@ -30,7 +31,7 @@
         }                                                                 \
     } while (0)
 
-#define EPS 0.005
+#define EPS 0.0001
 
 static void test_window(int len)
 {
@@ -57,10 +58,51 @@ static void test_window(int len)
     bench_new(src, len, dst1);
 }
 
+#if !ARCH_X86
+static void test_compute_autocorr(ptrdiff_t len, int lag)
+{
+    const double eps = EPS * (double)len;
+    LOCAL_ALIGNED(32, double, src, [5000 + 2 + MAX_LPC_ORDER]);
+    LOCAL_ALIGNED(16, double, dst0, [MAX_LPC_ORDER + 1]);
+    LOCAL_ALIGNED(16, double, dst1, [MAX_LPC_ORDER + 1]);
+
+    declare_func(void, const double *in, ptrdiff_t len, int lag, double *out);
+
+    av_assert0(lag >= 0 && lag <= MAX_LPC_ORDER);
+
+    for (int i = 0; i < MAX_LPC_ORDER; i++)
+        src[i] = 0.;
+
+    src += MAX_LPC_ORDER;
+
+    for (int i = 0; i < 5000 + 2; i++) {
+        src[i] = (double)rnd() / (double)UINT_MAX;
+    }
+
+    call_ref(src, len, lag, dst0);
+    call_new(src, len, lag, dst1);
+
+    for (size_t i = 0; i <= lag; i++) {
+        if (!double_near_abs_eps(dst0[i], dst1[i], eps)) {
+            fprintf(stderr, "%zu: %- .12f - %- .12f = % .12g\n",
+                    i, dst0[i], dst1[i], dst0[i] - dst1[i]);
+            fail();
+            break;
+        }
+    }
+
+    bench_new(src, 4608, lag, dst1);
+}
+#endif
+
 void checkasm_check_lpc(void)
 {
     LPCContext ctx;
-    int len = rnd() % 5000;
+    int len = 2000 + rnd() % 3000;
+#if !ARCH_X86
+    static const int lags[] = { 8, 12, };
+#endif
+
     ff_lpc_init(&ctx, 32, 16, FF_LPC_TYPE_DEFAULT);
 
     if (check_func(ctx.lpc_apply_welch_window, "apply_welch_window_even")) {
@@ -72,6 +114,17 @@ void checkasm_check_lpc(void)
         test_window(len | 1);
     }
     report("apply_welch_window_odd");
-
     ff_lpc_end(&ctx);
+
+#if !ARCH_X86
+    for (size_t i = 0; i < FF_ARRAY_ELEMS(lags); i++) {
+        ff_lpc_init(&ctx, len, lags[i], FF_LPC_TYPE_DEFAULT);
+        if (check_func(ctx.lpc_compute_autocorr, "autocorr_%d", lags[i])) {
+            test_compute_autocorr(len & ~1, lags[i]);
+            /*TODO: test_compute_autocorr(len | 1, lags[i]);*/
+        }
+        ff_lpc_end(&ctx);
+    }
+    report("compute_autocorr");
+#endif
 }
-- 
2.45.1