Revert of Moved ring-buffer related files from common_audio to audio_processing

webrtc/common_audio/ring_buffer_unittest.cc

Index: webrtc/common_audio/ring_buffer_unittest.cc
diff --git a/webrtc/common_audio/ring_buffer_unittest.cc b/webrtc/common_audio/ring_buffer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..92c470a02d707ba27f14e57c489b4e0596243e60
--- /dev/null
+++ b/webrtc/common_audio/ring_buffer_unittest.cc
@@ -0,0 +1,150 @@
+/*
+ *  Copyright (c) 2013 The WebRTC 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 "webrtc/common_audio/ring_buffer.h"
+
+#include <stdlib.h>
+#include <time.h>
+
+#include <algorithm>
+#include <memory>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace webrtc {
+
+struct FreeBufferDeleter {
+  inline void operator()(void* ptr) const {
+    WebRtc_FreeBuffer(ptr);
+  }
+};
+typedef std::unique_ptr<RingBuffer, FreeBufferDeleter> scoped_ring_buffer;
+
+static void AssertElementEq(int expected, int actual) {
+  ASSERT_EQ(expected, actual);
+}
+
+static int SetIncrementingData(int* data, int num_elements,
+                               int starting_value) {
+  for (int i = 0; i < num_elements; i++) {
+    data[i] = starting_value++;
+  }
+  return starting_value;
+}
+
+static int CheckIncrementingData(int* data, int num_elements,
+                                 int starting_value) {
+  for (int i = 0; i < num_elements; i++) {
+    AssertElementEq(starting_value++, data[i]);
+  }
+  return starting_value;
+}
+
+// We use ASSERTs in this test to avoid obscuring the seed in the case of a
+// failure.
+static void RandomStressTest(int** data_ptr) {
+  const int kNumTests = 10;
+  const int kNumOps = 1000;
+  const int kMaxBufferSize = 1000;
+
+  unsigned int seed = time(NULL);
+  printf("seed=%u\n", seed);
+  srand(seed);
+  for (int i = 0; i < kNumTests; i++) {
+    const int buffer_size = std::max(rand() % kMaxBufferSize, 1);
+    std::unique_ptr<int[]> write_data(new int[buffer_size]);
+    std::unique_ptr<int[]> read_data(new int[buffer_size]);
+    scoped_ring_buffer buffer(WebRtc_CreateBuffer(buffer_size, sizeof(int)));
+    ASSERT_TRUE(buffer.get() != NULL);
+    WebRtc_InitBuffer(buffer.get());
+    int buffer_consumed = 0;
+    int write_element = 0;
+    int read_element = 0;
+    for (int j = 0; j < kNumOps; j++) {
+      const bool write = rand() % 2 == 0 ? true : false;
+      const int num_elements = rand() % buffer_size;
+      if (write) {
+        const int buffer_available = buffer_size - buffer_consumed;
+        ASSERT_EQ(static_cast<size_t>(buffer_available),
+                  WebRtc_available_write(buffer.get()));
+        const int expected_elements = std::min(num_elements, buffer_available);
+        write_element = SetIncrementingData(write_data.get(), expected_elements,
+                                     write_element);
+        ASSERT_EQ(static_cast<size_t>(expected_elements),
+                  WebRtc_WriteBuffer(buffer.get(), write_data.get(),
+                                     num_elements));
+        buffer_consumed = std::min(buffer_consumed + expected_elements,
+                                   buffer_size);
+      } else {
+        const int expected_elements = std::min(num_elements,
+                                               buffer_consumed);
+        ASSERT_EQ(static_cast<size_t>(buffer_consumed),
+                  WebRtc_available_read(buffer.get()));
+        ASSERT_EQ(static_cast<size_t>(expected_elements),
+                  WebRtc_ReadBuffer(buffer.get(),
+                                    reinterpret_cast<void**>(data_ptr),
+                                    read_data.get(),
+                                    num_elements));
+        int* check_ptr = read_data.get();
+        if (data_ptr) {
+          check_ptr = *data_ptr;
+        }
+        read_element = CheckIncrementingData(check_ptr, expected_elements,
+                                             read_element);
+        buffer_consumed = std::max(buffer_consumed - expected_elements, 0);
+      }
+    }
+  }
+}
+
+TEST(RingBufferTest, RandomStressTest) {
+  int* data_ptr = NULL;
+  RandomStressTest(&data_ptr);
+}
+
+TEST(RingBufferTest, RandomStressTestWithNullPtr) {
+  RandomStressTest(NULL);
+}
+
+TEST(RingBufferTest, PassingNulltoReadBufferForcesMemcpy) {
+  const size_t kDataSize = 2;
+  int write_data[kDataSize];
+  int read_data[kDataSize];
+  int* data_ptr;
+
+  scoped_ring_buffer buffer(WebRtc_CreateBuffer(kDataSize, sizeof(int)));
+  ASSERT_TRUE(buffer.get() != NULL);
+  WebRtc_InitBuffer(buffer.get());
+
+  SetIncrementingData(write_data, kDataSize, 0);
+  EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
+  SetIncrementingData(read_data, kDataSize, kDataSize);
+  EXPECT_EQ(kDataSize, WebRtc_ReadBuffer(buffer.get(),
+      reinterpret_cast<void**>(&data_ptr), read_data, kDataSize));
+  // Copying was not necessary, so |read_data| has not been updated.
+  CheckIncrementingData(data_ptr, kDataSize, 0);
+  CheckIncrementingData(read_data, kDataSize, kDataSize);
+
+  EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
+  EXPECT_EQ(kDataSize, WebRtc_ReadBuffer(buffer.get(), NULL, read_data,
+                                         kDataSize));
+  // Passing NULL forces a memcpy, so |read_data| is now updated.
+  CheckIncrementingData(read_data, kDataSize, 0);
+}
+
+TEST(RingBufferTest, CreateHandlesErrors) {
+  EXPECT_TRUE(WebRtc_CreateBuffer(0, 1) == NULL);
+  EXPECT_TRUE(WebRtc_CreateBuffer(1, 0) == NULL);
+  RingBuffer* buffer = WebRtc_CreateBuffer(1, 1);
+  EXPECT_TRUE(buffer != NULL);
+  WebRtc_FreeBuffer(buffer);
+}
+
+}  // namespace webrtc