1 files changed, 65 insertions, 0 deletions
diff --git a/src/utils/logging.cc b/src/utils/logging.cc
new file mode 100644
index 0000000..9a43c22
--- /dev/null
+++ b/src/utils/logging.cc
@@ -0,0 +1,65 @@
+// Copyright 2019 The libgav1 Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/utils/logging.h"
+
+#include <cstdarg>
+#include <cstdio>
+#include <sstream>
+#include <thread>  // NOLINT (unapproved c++11 header)
+
+#if !defined(LIBGAV1_LOG_LEVEL)
+#define LIBGAV1_LOG_LEVEL (1 << 30)
+#endif
+
+namespace libgav1 {
+namespace internal {
+#if LIBGAV1_ENABLE_LOGGING
+namespace {
+
+const char* LogSeverityName(LogSeverity severity) {
+  switch (severity) {
+    case LogSeverity::kInfo:
+      return "INFO";
+    case LogSeverity::kError:
+      return "ERROR";
+    case LogSeverity::kWarning:
+      return "WARNING";
+  }
+  return "UNKNOWN";
+}
+
+}  // namespace
+
+void Log(LogSeverity severity, const char* file, int line, const char* format,
+         ...) {
+  if (LIBGAV1_LOG_LEVEL < static_cast<int>(severity)) return;
+  std::ostringstream ss;
+  ss << std::hex << std::this_thread::get_id();
+  fprintf(stderr, "%s %s %s:%d] ", LogSeverityName(severity), ss.str().c_str(),
+          file, line);
+
+  va_list ap;
+  va_start(ap, format);
+  vfprintf(stderr, format, ap);
+  va_end(ap);
+  fprintf(stderr, "\n");
+}
+#else  // !LIBGAV1_ENABLE_LOGGING
+void Log(LogSeverity /*severity*/, const char* /*file*/, int /*line*/,
+         const char* /*format*/, ...) {}
+#endif  // LIBGAV1_ENABLE_LOGGING
+
+}  // namespace internal
+}  // namespace libgav1