Decode callback step 1: Added skeleton decode callback to get the flow going. (#39)

* * rocDecode/HEVC: Added skeleton decode callback to get the flow going.

* *rocDecode/HEVC: Added error handling for decode call.

src/rocdecode/roc_decoder.cpp

@@ -54,10 +54,13 @@ RocDecoder::RocDecoder(RocDecoderCreateInfo& decoder_create_info): va_video_deco
  }
 
 rocDecStatus RocDecoder::decodeFrame(RocdecPicParams *pPicParams) {
-    // todo:: return appropriate decStatus if fails
-    // call funsction to do va-api decoding using the picture parameters structure
-    // return status
-    return ROCDEC_NOT_IMPLEMENTED;
+    rocDecStatus rocdec_status = ROCDEC_SUCCESS;
+    rocdec_status = va_video_decoder_.SubmitDecode(pPicParams);
+    if (rocdec_status != ROCDEC_SUCCESS) {
+        ERR("ERROR: Decode submission is not successful!" + TOSTR(rocdec_status));
+    }
+
+     return rocdec_status;
 }
 
 rocDecStatus RocDecoder::getDecodeStatus(int nPicIdx, RocdecDecodeStatus* pDecodeStatus) {

src/rocdecode/vaapi/vaapi_videodecoder.cpp

@@ -94,3 +94,8 @@ rocDecStatus VaapiVideoDecoder::CreateDecoderConfig() {
     CHECK_VAAPI(vaCreateConfig(va_display_, va_profile_, VAEntrypointVLD, &va_config_attrib_, 1, &va_config_id_));
     return ROCDEC_SUCCESS;
 }
+
+rocDecStatus VaapiVideoDecoder::SubmitDecode(RocdecPicParams *pPicParams) {
+    // Todo copy pic param, slice param, IQ matrix and slice data from RocdecPicParams to VAAPI struct buffers, then submit to VAAPI driver.
+    return ROCDEC_SUCCESS;
+}

src/rocdecode/vaapi/vaapi_videodecoder.h

@@ -48,6 +48,7 @@ public:
     VaapiVideoDecoder(RocDecoderCreateInfo &decoder_create_info);
     ~VaapiVideoDecoder();
     rocDecStatus InitializeDecoder(std::string gcn_arch_name);
+    rocDecStatus SubmitDecode(RocdecPicParams *pPicParams);
 private:
     RocDecoderCreateInfo decoder_create_info_;
     int drm_fd_;