libvpx: Add VP9 decoder.

source/libvpx/test/fdct4x4_test.cc

Index: source/libvpx/test/fdct4x4_test.cc
===================================================================
--- source/libvpx/test/fdct4x4_test.cc	(revision 172621)
+++ source/libvpx/test/fdct4x4_test.cc	(working copy)
@@ -1,79 +1,31 @@
 /*
-*  Copyright (c) 2012 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.
-*/
+ *  Copyright (c) 2012 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"
 
 extern "C" {
-#include "vpx_rtcd.h"
+#include "vp9_rtcd.h"
 }
 
-#include "test/acm_random.h"
-#include "third_party/googletest/src/include/gtest/gtest.h"
+#include "acm_random.h"
 #include "vpx/vpx_integer.h"
 
+using libvpx_test::ACMRandom;
 
 namespace {
 
-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;
-
-TEST(Vp8FdctTest, SignBiasCheck) {
+TEST(Vp9FdctTest, SignBiasCheck) {
   ACMRandom rnd(ACMRandom::DeterministicSeed());
   int16_t test_input_block[16];
   int16_t test_output_block[16];
@@ -88,7 +40,9 @@
     for (int j = 0; j < 16; ++j)
       test_input_block[j] = rnd.Rand8() - rnd.Rand8();
 
-    vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
+    // TODO(Yaowu): this should be converted to a parameterized test
+    // to test optimized versions of this function.
+    vp9_short_fdct4x4_c(test_input_block, test_output_block, pitch);
 
     for (int j = 0; j < 16; ++j) {
       if (test_output_block[j] < 0)
@@ -98,14 +52,14 @@
     }
   }
 
-  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);
+  for (int j = 0; j < 16; ++j) {
+    const bool bias_acceptable = (abs(count_sign_block[j][0] -
+                                      count_sign_block[j][1]) < 10000);
+    EXPECT_TRUE(bias_acceptable)
+        << "Error: 4x4 FDCT has a sign bias > 1%"
+        << " for input range [-255, 255] at index " << j;
+  }
 
-  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) {
@@ -113,7 +67,9 @@
     for (int j = 0; j < 16; ++j)
       test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4);
 
-    vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
+    // TODO(Yaowu): this should be converted to a parameterized test
+    // to test optimized versions of this function.
+    vp9_short_fdct4x4_c(test_input_block, test_output_block, pitch);
 
     for (int j = 0; j < 16; ++j) {
       if (test_output_block[j] < 0)
@@ -123,16 +79,16 @@
     }
   }
 
-  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]";
+  for (int j = 0; j < 16; ++j) {
+    const bool bias_acceptable = (abs(count_sign_block[j][0] -
+                                      count_sign_block[j][1]) < 100000);
+    EXPECT_TRUE(bias_acceptable)
+        << "Error: 4x4 FDCT has a sign bias > 10%"
+        << " for input range [-15, 15] at index " << j;
+  }
 };
 
-TEST(Vp8FdctTest, RoundTripErrorCheck) {
+TEST(Vp9FdctTest, RoundTripErrorCheck) {
   ACMRandom rnd(ACMRandom::DeterministicSeed());
   int max_error = 0;
   double total_error = 0;
@@ -146,11 +102,27 @@
     for (int j = 0; j < 16; ++j)
       test_input_block[j] = rnd.Rand8() - rnd.Rand8();
 
+    // TODO(Yaowu): this should be converted to a parameterized test
+    // to test optimized versions of this function.
     const int pitch = 8;
-    vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch);
-    reference_idct4x4(test_temp_block, test_output_block);
+    vp9_short_fdct4x4_c(test_input_block, test_temp_block, pitch);
 
     for (int j = 0; j < 16; ++j) {
+        if(test_temp_block[j] > 0) {
+          test_temp_block[j] += 2;
+          test_temp_block[j] /= 4;
+          test_temp_block[j] *= 4;
+        } else {
+          test_temp_block[j] -= 2;
+          test_temp_block[j] /= 4;
+          test_temp_block[j] *= 4;
+        }
+    }
+
+    // Because the bitstream is not frozen yet, use the idct in the codebase.
+    vp9_short_idct4x4llm_c(test_temp_block, test_output_block, pitch);
+
+    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)
@@ -158,12 +130,11 @@
       total_error += error;
     }
   }
+  EXPECT_GE(1, max_error)
+      << "Error: FDCT/IDCT has an individual roundtrip error > 1";
 
-  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";
+      << "Error: FDCT/IDCT has average roundtrip error > 1 per block";
 };
 
 }  // namespace