[EXPERIMENTAL] Generic stereo codec with index header sending merged frames

webrtc/api/video/video_frame_buffer.cc

Index: webrtc/api/video/video_frame_buffer.cc
diff --git a/webrtc/api/video/video_frame_buffer.cc b/webrtc/api/video/video_frame_buffer.cc
index d771e6ac42d7919b756a668ae0e84df14144d554..66f58e83beab3ab585a60c0e1f1a785cb37ab92b 100644
--- a/webrtc/api/video/video_frame_buffer.cc
+++ b/webrtc/api/video/video_frame_buffer.cc
@@ -49,6 +49,18 @@ int I420BufferInterface::ChromaHeight() const {
   return (height() + 1) / 2;
 }
 
+bool I420BufferInterface::HasAlpha() const {
+  return DataA() != nullptr && StrideA() != 0;
+}
+
+const uint8_t* I420BufferInterface::DataA() const {
+  return nullptr;
+}
+
+int I420BufferInterface::StrideA() const {
+  return 0;
+}
+
 rtc::scoped_refptr<I420BufferInterface> I420BufferInterface::ToI420() {
   return this;
 }