Added logging control (#667)

* * rocDecode: Added logging control
 - Message output from the core components is now controlled by the logging level, which can be set by an environment variable or other methods.

* * rocDecode/Logging control: Fixed a typo.

* * rocDecode/Logging control: Removed reference to the logger class from RocVideoDecoder utility, which results in build error on non-source install environment.

* * rocDecode/Logging control: Improved some wording in the docs.

src/rocdecode/vaapi/vaapi_videodecoder.h

@@ -45,7 +45,7 @@ THE SOFTWARE.
 #define CHECK_HIP(call) {\
     hipError_t hip_status = call;\
     if (hip_status != hipSuccess) {\
-        std::cout << "HIP failure: " << #call << " failed with 'status: " << hipGetErrorName(hip_status) << "' at " <<  __FILE__ << ":" << __LINE__ << std::endl;\
+        logger_.CriticalLog(MakeMsg("HIP failure: " + #call + " failed with 'status: " + STR(hipGetErrorName(hip_status)) + "' at " + __FILE__ + ":" + TOSTR(__LINE__)));\
         return ROCDEC_RUNTIME_ERROR;\
     }\
 }
@@ -53,7 +53,7 @@ THE SOFTWARE.
 #define CHECK_VAAPI(call) {\
     VAStatus va_status = call;\
     if (va_status != VA_STATUS_SUCCESS) {\
-        std::cout << "VAAPI failure: " << #call << " failed with status: " << std::hex << "0x" << va_status << std::dec << " = '" << vaErrorStr(va_status) << "' at " <<  __FILE__ << ":" << __LINE__ << std::endl;\
+        logger_.CriticalLog(MakeMsg("VAAPI failure: " + #call + " failed with 'status: " + TOSTR(va_status) + ": " + vaErrorStr(va_status) + "' at " + __FILE__ + ":" + TOSTR(__LINE__)));\
         return ROCDEC_RUNTIME_ERROR;\
     }\
 }
@@ -115,6 +115,8 @@ private:
     uint32_t num_slices_;
     VABufferID slice_data_buf_id_;
 
+    RocDecLogger logger_;
+
     bool IsCodecConfigSupported(int device_id, rocDecVideoCodec codec_type, rocDecVideoChromaFormat chroma_format, uint32_t bit_depth_minus8, rocDecVideoSurfaceFormat output_format);
     rocDecStatus CreateDecoderConfig();
     rocDecStatus CreateSurfaces();
@@ -152,6 +154,8 @@ private:
     VaContext& operator = (const VaContext) = delete;
     ~VaContext();
 
+    RocDecLogger logger_;
+
     rocDecStatus InitHIP(int device_id, hipDeviceProp_t& hip_dev_prop);
     rocDecStatus InitVAAPI(int va_ctx_idx, std::string drm_node);
     void GetVisibleDevices(std::vector<int>& visible_devices_vetor);