Reland of Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/yuv_frame_writer.cc

Index: webrtc/test/testsupport/yuv_frame_writer.cc
diff --git a/webrtc/test/testsupport/yuv_frame_writer.cc b/webrtc/test/testsupport/yuv_frame_writer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3c0076152e84b4fd0731b2e3707ad7f3b82a7fd5
--- /dev/null
+++ b/webrtc/test/testsupport/yuv_frame_writer.cc
@@ -0,0 +1,77 @@
+/*
+ *  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 {
+
+YuvFrameWriterImpl::YuvFrameWriterImpl(std::string output_filename,
+                                       int width,
+                                       int height)
+    : output_filename_(output_filename),
+      frame_length_in_bytes_(0),
+      width_(width),
+      height_(height),
+      output_file_(nullptr) {}
+
+YuvFrameWriterImpl::~YuvFrameWriterImpl() {
+  Close();
+}
+
+bool YuvFrameWriterImpl::Init() {
+  if (width_ <= 0 || height_ <= 0) {
+    fprintf(stderr, "Frame width and height must be >0, was %d x %d\n", width_,
+            height_);
+    return false;
+  }
+  frame_length_in_bytes_ =
+      width_ * height_ + 2 * ((width_ + 1) / 2) * ((height_ + 1) / 2);
+
+  output_file_ = fopen(output_filename_.c_str(), "wb");
+  if (output_file_ == nullptr) {
+    fprintf(stderr, "Couldn't open output file for writing: %s\n",
+            output_filename_.c_str());
+    return false;
+  }
+  return true;
+}
+
+bool YuvFrameWriterImpl::WriteFrame(uint8_t* frame_buffer) {
+  RTC_DCHECK(frame_buffer);
+  if (output_file_ == nullptr) {
+    fprintf(stderr,
+            "YuvFrameWriterImpl is not initialized (output file is NULL)\n");
+    return false;
+  }
+  size_t bytes_written =
+      fwrite(frame_buffer, 1, frame_length_in_bytes_, output_file_);
+  if (bytes_written != frame_length_in_bytes_) {
+    fprintf(stderr, "Failed to write %zu bytes to file %s\n",
+            frame_length_in_bytes_, output_filename_.c_str());
+    return false;
+  }
+  return true;
+}
+
+void YuvFrameWriterImpl::Close() {
+  if (output_file_ != nullptr) {
+    fclose(output_file_);
+    output_file_ = nullptr;
+  }
+}
+
+size_t YuvFrameWriterImpl::FrameLength() {
+  return frame_length_in_bytes_;
+}
+
+}  // namespace test
+}  // namespace webrtc