Changed rocDecode API header variable naming to Google C++ style. (#196)

* * rocDecode: Changed rocDecode API header variable naming to Google C++ style.

* * rocDecode: Unified AVC/H264 naming to AVC. Minor naming changes on HEVC related names.

* * rocDecode: Minor comment fix based on code review.

src/parser/parser_handle.h

@@ -42,15 +42,15 @@ private:
     std::shared_ptr<RocVideoParser> roc_parser_ = nullptr;
     void ClearErrors() { error_ = ""; }
     void CreateParser(RocdecParserParams *params) {
-        switch(params->CodecType) {
-            case rocDecVideoCodec_H264:
+        switch(params->codec_type) {
+            case rocDecVideoCodec_AVC:
                 roc_parser_ = std::make_shared<AvcVideoParser>();
                 break;
             case rocDecVideoCodec_HEVC:
                 roc_parser_ = std::make_shared<HevcVideoParser>();
                 break;
             default:
-                THROW("Unsupported parser type "+ TOSTR(params->CodecType));
+                THROW("Unsupported parser type "+ TOSTR(params->codec_type));
                 break;
         }