1 files changed, 92 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/test/vp9_boolcoder_test.cc b/media/libvpx/libvpx/test/vp9_boolcoder_test.cc
new file mode 100644
index 0000000000..6ba171a000
--- /dev/null
+++ b/media/libvpx/libvpx/test/vp9_boolcoder_test.cc
@@ -0,0 +1,92 @@
+/*
+ *  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 <stdlib.h>
+#include <string.h>
+
+#include "third_party/googletest/src/include/gtest/gtest.h"
+
+#include "test/acm_random.h"
+#include "vpx/vpx_integer.h"
+#include "vpx_dsp/bitreader.h"
+#include "vpx_dsp/bitwriter.h"
+
+using libvpx_test::ACMRandom;
+
+namespace {
+const int num_tests = 10;
+}  // namespace
+
+TEST(VP9, TestBitIO) {
+  ACMRandom rnd(ACMRandom::DeterministicSeed());
+  for (int n = 0; n < num_tests; ++n) {
+    for (int method = 0; method <= 7; ++method) {  // we generate various proba
+      const int kBitsToTest = 1000;
+      uint8_t probas[kBitsToTest];
+
+      for (int i = 0; i < kBitsToTest; ++i) {
+        const int parity = i & 1;
+        /* clang-format off */
+        probas[i] =
+          (method == 0) ? 0 : (method == 1) ? 255 :
+          (method == 2) ? 128 :
+          (method == 3) ? rnd.Rand8() :
+          (method == 4) ? (parity ? 0 : 255) :
+            // alternate between low and high proba:
+            (method == 5) ? (parity ? rnd(128) : 255 - rnd(128)) :
+            (method == 6) ?
+            (parity ? rnd(64) : 255 - rnd(64)) :
+            (parity ? rnd(32) : 255 - rnd(32));
+        /* clang-format on */
+      }
+      for (int bit_method = 0; bit_method <= 3; ++bit_method) {
+        const int random_seed = 6432;
+        const int kBufferSize = 10000;
+        ACMRandom bit_rnd(random_seed);
+        vpx_writer bw;
+        uint8_t bw_buffer[kBufferSize];
+        vpx_start_encode(&bw, bw_buffer);
+
+        int bit = (bit_method == 0) ? 0 : (bit_method == 1) ? 1 : 0;
+        for (int i = 0; i < kBitsToTest; ++i) {
+          if (bit_method == 2) {
+            bit = (i & 1);
+          } else if (bit_method == 3) {
+            bit = bit_rnd(2);
+          }
+          vpx_write(&bw, bit, static_cast<int>(probas[i]));
+        }
+
+        vpx_stop_encode(&bw);
+        // vpx_reader_fill() may read into uninitialized data that
+        // isn't used meaningfully, but may trigger an MSan warning.
+        memset(bw_buffer + bw.pos, 0, sizeof(BD_VALUE) - 1);
+
+        // First bit should be zero
+        GTEST_ASSERT_EQ(bw_buffer[0] & 0x80, 0);
+
+        vpx_reader br;
+        vpx_reader_init(&br, bw_buffer, kBufferSize, nullptr, nullptr);
+        bit_rnd.Reset(random_seed);
+        for (int i = 0; i < kBitsToTest; ++i) {
+          if (bit_method == 2) {
+            bit = (i & 1);
+          } else if (bit_method == 3) {
+            bit = bit_rnd(2);
+          }
+          GTEST_ASSERT_EQ(vpx_read(&br, probas[i]), bit)
+              << "pos: " << i << " / " << kBitsToTest
+              << " bit_method: " << bit_method << " method: " << method;
+        }
+      }
+    }
+  }
+}