Reland of Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/y4m_frame_writer.cc

+/*
+ *  Copyright (c) 2017 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/base/checks.h"
+#include "webrtc/test/testsupport/frame_writer.h"
+
+namespace webrtc {
+namespace test {
+
+Y4mFrameWriterImpl::Y4mFrameWriterImpl(std::string output_filename,
+                                       int width,
+                                       int height,
+                                       int frame_rate)
+    : YuvFrameWriterImpl(output_filename, width, height),
+      frame_rate_(frame_rate) {}
+
+Y4mFrameWriterImpl::~Y4mFrameWriterImpl() = default;
+
+bool Y4mFrameWriterImpl::Init() {
+  if (!YuvFrameWriterImpl::Init()) {
+    return false;
+  }
+  int bytes_written = fprintf(output_file_, "YUV4MPEG2 W%d H%d F%d:1 C420\n",
+                              width_, height_, frame_rate_);
+  if (bytes_written < 0) {
+    fprintf(stderr, "Failed to write Y4M file header to file %s\n",
+            output_filename_.c_str());
+    return false;
+  }
+  return true;
+}
+
+bool Y4mFrameWriterImpl::WriteFrame(uint8_t* frame_buffer) {
+  if (output_file_ == nullptr) {
+    fprintf(stderr,
+            "Y4mFrameWriterImpl is not initialized (output file is NULL)\n");
+    return false;
+  }
+  int bytes_written = fprintf(output_file_, "FRAME\n");
+  if (bytes_written < 0) {
+    fprintf(stderr, "Failed to write Y4M frame header to file %s\n",
+            output_filename_.c_str());
+    return false;
+  }
+  return YuvFrameWriterImpl::WriteFrame(frame_buffer);
+}
+
+}  // namespace test
+}  // namespace webrtc