Updated videoDecodePerf Sample with host backend (#635)

* set min: number of decoded surfaces to non-zero value for ffmpeg based decoding

* added host decoding option to videodecode perf app

* fix GetOutputSurfaceInfo() for FFMpeg

* updated chagelog

* added host decoding option to videodecode perf app

* fix GetOutputSurfaceInfo() for FFMpeg

* updated chagelog

* removed GPU device info printing for HOST backend

* fix for review comment

utils/ffmpegvideodecode/ffmpeg_video_dec.cpp

@@ -45,11 +45,16 @@ static inline float GetChromaWidthFactor(rocDecVideoSurfaceFormat surface_format
 
 FFMpegVideoDecoder::FFMpegVideoDecoder(int device_id, OutputSurfaceMemoryType out_mem_type, rocDecVideoCodec codec, bool force_zero_latency,
               const Rect *p_crop_rect, bool extract_user_sei_Message, uint32_t disp_delay,  int max_width, int max_height, uint32_t clk_rate) :
-              RocVideoDecoder(device_id, out_mem_type, codec, force_zero_latency, p_crop_rect, extract_user_sei_Message, disp_delay, max_width, max_height, clk_rate) {
+               RocVideoDecoder(device_id, out_mem_type, codec, force_zero_latency, p_crop_rect, extract_user_sei_Message, disp_delay, max_width, max_height, clk_rate, true) {
 
     if ((out_mem_type_ == OUT_SURFACE_MEM_DEV_INTERNAL) || (out_mem_type_ == OUT_SURFACE_MEM_NOT_MAPPED)) {
         ROCDEC_THROW("Unsupported output memory type", ROCDEC_INVALID_PARAMETER);
     }
+    if (out_mem_type_ == OUT_SURFACE_MEM_DEV_COPIED) {
+        if (!InitHIP(device_id_)) {
+            ROCDEC_THROW("Failed to initilize the HIP", ROCDEC_DEVICE_INVALID);
+        }
+    }
     // many of the decoder parameters are hardcoded below for just creating the decoder.
     // In the handlevideosequence callback, the decoder will get reconfigured to the actual parameters in the sequence header
     RocDecoderHostCreateInfo create_info = {};
@@ -74,7 +79,19 @@ FFMpegVideoDecoder::FFMpegVideoDecoder(int device_id, OutputSurfaceMemoryType ou
     create_info.pfn_display_picture = FFMpegHandlePictureDisplayProc;
     create_info.pfn_get_sei_msg = nullptr;        // tobe supported in future
     ROCDEC_API_CALL(rocDecCreateDecoderHost(&roc_decoder_, &create_info));
-
+    // set disp_width and height to non_zero values for it doesn't trigger decoding error before actual start of decoding
+    disp_width_ = max_width;
+    disp_height_ = max_height;
+    // fill output_surface_info_
+    output_surface_info_.output_width = max_width;
+    output_surface_info_.output_height = max_height;
+    output_surface_info_.output_pitch  = max_width * 2;     // bytes_per_pixel 2
+    output_surface_info_.output_vstride = max_height;
+    output_surface_info_.bit_depth = bitdepth_minus_8_ + 8;
+    output_surface_info_.bytes_per_pixel = 2;
+    output_surface_info_.surface_format = rocDecVideoSurfaceFormat_P016;
+    output_surface_info_.num_chroma_planes = 2;
+    output_surface_info_.mem_type = OUT_SURFACE_MEM_HOST_COPIED;
 }
 
 
@@ -201,6 +218,15 @@ int FFMpegVideoDecoder::HandleVideoSequence(RocdecVideoFormatHost *format_host)
     return num_decode_surfaces;
 }
 
+bool FFMpegVideoDecoder::GetOutputSurfaceInfo(OutputSurfaceInfo **surface_info) {
+    if (!disp_width_ || !disp_height_) {
+        std::cerr << "ERROR: FFMpegVideo is not intialized" << std::endl;
+        return false;
+    }
+    *surface_info = &output_surface_info_;
+    return true;
+}
+
 /**
  * @brief function to reconfigure decoder if there is a change in sequence params.
  *