Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/y4m_frame_writer_unittest.cc

 /*
  *  Copyright (c) 2011 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/test/testsupport/frame_writer.h"
+#include <memory>
+#include <string>
 
 #include "webrtc/test/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
+#include "webrtc/test/testsupport/frame_writer.h"
 
 namespace webrtc {
 namespace test {
 
-const size_t kFrameLength = 1000;
+namespace {
+const size_t kFrameWidth = 50;
+const size_t kFrameHeight = 20;
+const size_t kFrameLength = 3 * kFrameWidth * kFrameHeight / 2;  // I420.
+const size_t kFrameRate = 30;
 
-class FrameWriterTest: public testing::Test {
+const std::string kFileHeader = "YUV4MPEG2 W50 H20 F30:1 C420\n";
+const std::string kFrameHeader = "FRAME\n";
+}  // namespace
+
+class Y4mFrameWriterTest : public testing::Test {
  protected:
-  FrameWriterTest() {}
-  virtual ~FrameWriterTest() {}
-  void SetUp() {
+  Y4mFrameWriterTest() = default;
+  ~Y4mFrameWriterTest() override = default;
+
+  void SetUp() override {
     temp_filename_ = webrtc::test::TempFilename(webrtc::test::OutputPath(),
-                                                "frame_writer_unittest");
-    frame_writer_ = new FrameWriterImpl(temp_filename_, kFrameLength);
+                                                "y4m_frame_writer_unittest");
+    frame_writer_.reset(new Y4mFrameWriterImpl(temp_filename_, kFrameWidth,
+                                               kFrameHeight, kFrameRate));
     ASSERT_TRUE(frame_writer_->Init());
   }
-  void TearDown() {
-    delete frame_writer_;
-    // Cleanup the temporary file.
-    remove(temp_filename_.c_str());
-  }
-  FrameWriter* frame_writer_;
+
+  void TearDown() override { remove(temp_filename_.c_str()); }
+
+  std::unique_ptr<FrameWriter> frame_writer_;
   std::string temp_filename_;
 };
 
-TEST_F(FrameWriterTest, InitSuccess) {
-  FrameWriterImpl frame_writer(temp_filename_, kFrameLength);
-  ASSERT_TRUE(frame_writer.Init());
-  ASSERT_EQ(kFrameLength, frame_writer.FrameLength());
+TEST_F(Y4mFrameWriterTest, InitSuccess) {}
+
+TEST_F(Y4mFrameWriterTest, FrameLength) {
+  EXPECT_EQ(kFrameLength, frame_writer_->FrameLength());
 }
 
-TEST_F(FrameWriterTest, WriteFrame) {
+TEST_F(Y4mFrameWriterTest, WriteFrame) {
   uint8_t buffer[kFrameLength];
-  memset(buffer, 9, kFrameLength);  // Write lots of 9s to the buffer
+  memset(buffer, 9, kFrameLength);  // Write lots of 9s to the buffer.
   bool result = frame_writer_->WriteFrame(buffer);
-  ASSERT_TRUE(result);  // success
-  // Close the file and verify the size.
+  ASSERT_TRUE(result);
+  result = frame_writer_->WriteFrame(buffer);
+  ASSERT_TRUE(result);
+
   frame_writer_->Close();
-  ASSERT_EQ(kFrameLength, GetFileSize(temp_filename_));
+  EXPECT_EQ(kFileHeader.size() + 2 * kFrameHeader.size() + 2 * kFrameLength,
+            GetFileSize(temp_filename_));
 }
 
-TEST_F(FrameWriterTest, WriteFrameUninitialized) {
-  uint8_t buffer[3];
-  FrameWriterImpl frame_writer(temp_filename_, kFrameLength);
-  ASSERT_FALSE(frame_writer.WriteFrame(buffer));
+TEST_F(Y4mFrameWriterTest, WriteFrameUninitialized) {
+  uint8_t buffer[kFrameLength];
+  Y4mFrameWriterImpl frame_writer(temp_filename_, kFrameWidth, kFrameHeight,
+                                  kFrameRate);
+  EXPECT_FALSE(frame_writer.WriteFrame(buffer));
 }
 
 }  // namespace test
 }  // namespace webrtc