move getEnvVar function to common (#299)

[ROCm/rocdecode commit: d5b5a31881]

projects/rocdecode/samples/videoDecodePerf/CMakeLists.txt

@@ -74,7 +74,7 @@ if(HIP_FOUND AND FFMPEG_FOUND AND ROCDECODE_FOUND AND Threads_FOUND)
                       ${SWSCALE_INCLUDE_DIR} ${AVFORMAT_INCLUDE_DIR})
     set(LINK_LIBRARY_LIST ${LINK_LIBRARY_LIST} ${FFMPEG_LIBRARIES})
     # rocDecode and utils
-    include_directories (${ROCDECODE_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/../../utils ${CMAKE_CURRENT_SOURCE_DIR}/../../utils/rocvideodecode)
+    include_directories (${ROCDECODE_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/../../utils ${CMAKE_CURRENT_SOURCE_DIR}/../../utils/rocvideodecode ${CMAKE_CURRENT_SOURCE_DIR}/..)
     set(LINK_LIBRARY_LIST ${LINK_LIBRARY_LIST} ${ROCDECODE_LIBRARY})
     # threads
     set(THREADS_PREFER_PTHREAD_FLAG ON)

projects/rocdecode/samples/videoDecodePerf/videodecodeperf.cpp

@@ -35,6 +35,7 @@ THE SOFTWARE.
 #endif
 #include "video_demuxer.h"
 #include "roc_video_dec.h"
+#include "common.h"
 
 void DecProc(RocVideoDecoder *p_dec, VideoDemuxer *demuxer, int *pn_frame, double *pn_fps) {
     int n_video_bytes = 0, n_frame_returned = 0, n_frame = 0;