Implement H264 codec in Objective-C classes.

webrtc/sdk/objc/Framework/Classes/VideoToolbox/helpers.h

Index: webrtc/sdk/objc/Framework/Classes/VideoToolbox/helpers.h
diff --git a/webrtc/sdk/objc/Framework/Classes/VideoToolbox/helpers.h b/webrtc/sdk/objc/Framework/Classes/VideoToolbox/helpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..11c19ad7b43f9692528a614a816ca65b93f0cd1f
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/VideoToolbox/helpers.h
@@ -0,0 +1,47 @@
+/*
+ *  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.
+ *
+ */
+
+#ifndef WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOX_HELPERS_H_
+#define WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOX_HELPERS_H_
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <VideoToolbox/VideoToolbox.h>
+#include <string>
+
+// Convenience function for creating a dictionary.
+inline CFDictionaryRef CreateCFTypeDictionary(CFTypeRef* keys,
+                                              CFTypeRef* values,
+                                              size_t size) {
+  return CFDictionaryCreate(kCFAllocatorDefault, keys, values, size,
+                            &kCFTypeDictionaryKeyCallBacks,
+                            &kCFTypeDictionaryValueCallBacks);
+}
+
+// Copies characters from a CFStringRef into a std::string.
+std::string CFStringToString(const CFStringRef cf_string);
+
+// Convenience function for setting a VT property.
+void SetVTSessionProperty(VTSessionRef session, CFStringRef key, int32_t value);
+
+// Convenience function for setting a VT property.
+void SetVTSessionProperty(VTSessionRef session,
+                          CFStringRef key,
+                          uint32_t value);
+
+// Convenience function for setting a VT property.
+void SetVTSessionProperty(VTSessionRef session, CFStringRef key, bool value);
+
+// Convenience function for setting a VT property.
+void SetVTSessionProperty(VTSessionRef session,
+                          CFStringRef key,
+                          CFStringRef value);
+
+#endif  // WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOX_HELPERS_H_