1 files changed, 211 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/test/vp8_fdct4x4_test.cc b/media/libvpx/libvpx/test/vp8_fdct4x4_test.cc
new file mode 100644
index 0000000000..1b73a72a01
--- /dev/null
+++ b/media/libvpx/libvpx/test/vp8_fdct4x4_test.cc
@@ -0,0 +1,211 @@
+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <math.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "third_party/googletest/src/include/gtest/gtest.h"
+
+#include "./vpx_config.h"
+#include "./vp8_rtcd.h"
+#include "test/acm_random.h"
+#include "vpx/vpx_integer.h"
+#include "vpx_ports/mem.h"
+
+namespace {
+
+typedef void (*FdctFunc)(int16_t *a, int16_t *b, int a_stride);
+
+const int cospi8sqrt2minus1 = 20091;
+const int sinpi8sqrt2 = 35468;
+
+void reference_idct4x4(const int16_t *input, int16_t *output) {
+  const int16_t *ip = input;
+  int16_t *op = output;
+
+  for (int i = 0; i < 4; ++i) {
+    const int a1 = ip[0] + ip[8];
+    const int b1 = ip[0] - ip[8];
+    const int temp1 = (ip[4] * sinpi8sqrt2) >> 16;
+    const int temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16);
+    const int c1 = temp1 - temp2;
+    const int temp3 = ip[4] + ((ip[4] * cospi8sqrt2minus1) >> 16);
+    const int temp4 = (ip[12] * sinpi8sqrt2) >> 16;
+    const int d1 = temp3 + temp4;
+    op[0] = a1 + d1;
+    op[12] = a1 - d1;
+    op[4] = b1 + c1;
+    op[8] = b1 - c1;
+    ++ip;
+    ++op;
+  }
+  ip = output;
+  op = output;
+  for (int i = 0; i < 4; ++i) {
+    const int a1 = ip[0] + ip[2];
+    const int b1 = ip[0] - ip[2];
+    const int temp1 = (ip[1] * sinpi8sqrt2) >> 16;
+    const int temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1) >> 16);
+    const int c1 = temp1 - temp2;
+    const int temp3 = ip[1] + ((ip[1] * cospi8sqrt2minus1) >> 16);
+    const int temp4 = (ip[3] * sinpi8sqrt2) >> 16;
+    const int d1 = temp3 + temp4;
+    op[0] = (a1 + d1 + 4) >> 3;
+    op[3] = (a1 - d1 + 4) >> 3;
+    op[1] = (b1 + c1 + 4) >> 3;
+    op[2] = (b1 - c1 + 4) >> 3;
+    ip += 4;
+    op += 4;
+  }
+}
+
+using libvpx_test::ACMRandom;
+
+class FdctTest : public ::testing::TestWithParam<FdctFunc> {
+ public:
+  virtual void SetUp() {
+    fdct_func_ = GetParam();
+    rnd_.Reset(ACMRandom::DeterministicSeed());
+  }
+
+ protected:
+  FdctFunc fdct_func_;
+  ACMRandom rnd_;
+};
+
+TEST_P(FdctTest, SignBiasCheck) {
+  int16_t test_input_block[16];
+  DECLARE_ALIGNED(16, int16_t, test_output_block[16]);
+  const int pitch = 8;
+  int count_sign_block[16][2];
+  const int count_test_block = 1000000;
+
+  memset(count_sign_block, 0, sizeof(count_sign_block));
+
+  for (int i = 0; i < count_test_block; ++i) {
+    // Initialize a test block with input range [-255, 255].
+    for (int j = 0; j < 16; ++j) {
+      test_input_block[j] = rnd_.Rand8() - rnd_.Rand8();
+    }
+
+    fdct_func_(test_input_block, test_output_block, pitch);
+
+    for (int j = 0; j < 16; ++j) {
+      if (test_output_block[j] < 0) {
+        ++count_sign_block[j][0];
+      } else if (test_output_block[j] > 0) {
+        ++count_sign_block[j][1];
+      }
+    }
+  }
+
+  bool bias_acceptable = true;
+  for (int j = 0; j < 16; ++j) {
+    bias_acceptable =
+        bias_acceptable &&
+        (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 10000);
+  }
+
+  EXPECT_EQ(true, bias_acceptable)
+      << "Error: 4x4 FDCT has a sign bias > 1% for input range [-255, 255]";
+
+  memset(count_sign_block, 0, sizeof(count_sign_block));
+
+  for (int i = 0; i < count_test_block; ++i) {
+    // Initialize a test block with input range [-15, 15].
+    for (int j = 0; j < 16; ++j) {
+      test_input_block[j] = (rnd_.Rand8() >> 4) - (rnd_.Rand8() >> 4);
+    }
+
+    fdct_func_(test_input_block, test_output_block, pitch);
+
+    for (int j = 0; j < 16; ++j) {
+      if (test_output_block[j] < 0) {
+        ++count_sign_block[j][0];
+      } else if (test_output_block[j] > 0) {
+        ++count_sign_block[j][1];
+      }
+    }
+  }
+
+  bias_acceptable = true;
+  for (int j = 0; j < 16; ++j) {
+    bias_acceptable =
+        bias_acceptable &&
+        (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 100000);
+  }
+
+  EXPECT_EQ(true, bias_acceptable)
+      << "Error: 4x4 FDCT has a sign bias > 10% for input range [-15, 15]";
+}
+
+TEST_P(FdctTest, RoundTripErrorCheck) {
+  int max_error = 0;
+  double total_error = 0;
+  const int count_test_block = 1000000;
+  for (int i = 0; i < count_test_block; ++i) {
+    int16_t test_input_block[16];
+    int16_t test_output_block[16];
+    DECLARE_ALIGNED(16, int16_t, test_temp_block[16]);
+
+    // Initialize a test block with input range [-255, 255].
+    for (int j = 0; j < 16; ++j) {
+      test_input_block[j] = rnd_.Rand8() - rnd_.Rand8();
+    }
+
+    const int pitch = 8;
+    fdct_func_(test_input_block, test_temp_block, pitch);
+    reference_idct4x4(test_temp_block, test_output_block);
+
+    for (int j = 0; j < 16; ++j) {
+      const int diff = test_input_block[j] - test_output_block[j];
+      const int error = diff * diff;
+      if (max_error < error) max_error = error;
+      total_error += error;
+    }
+  }
+
+  EXPECT_GE(1, max_error)
+      << "Error: FDCT/IDCT has an individual roundtrip error > 1";
+
+  EXPECT_GE(count_test_block, total_error)
+      << "Error: FDCT/IDCT has average roundtrip error > 1 per block";
+}
+
+INSTANTIATE_TEST_SUITE_P(C, FdctTest, ::testing::Values(vp8_short_fdct4x4_c));
+
+#if HAVE_NEON
+INSTANTIATE_TEST_SUITE_P(NEON, FdctTest,
+                         ::testing::Values(vp8_short_fdct4x4_neon));
+#endif  // HAVE_NEON
+
+#if HAVE_SSE2
+INSTANTIATE_TEST_SUITE_P(SSE2, FdctTest,
+                         ::testing::Values(vp8_short_fdct4x4_sse2));
+#endif  // HAVE_SSE2
+
+#if HAVE_MSA
+INSTANTIATE_TEST_SUITE_P(MSA, FdctTest,
+                         ::testing::Values(vp8_short_fdct4x4_msa));
+#endif  // HAVE_MSA
+#if HAVE_MMI
+INSTANTIATE_TEST_SUITE_P(MMI, FdctTest,
+                         ::testing::Values(vp8_short_fdct4x4_mmi));
+#endif  // HAVE_MMI
+
+#if HAVE_LSX
+INSTANTIATE_TEST_SUITE_P(LSX, FdctTest,
+                         ::testing::Values(vp8_short_fdct4x4_lsx));
+#endif  // HAVE_LSX
+}  // namespace