fix(nvenc): Enable opt-in client refresh by client (#3415)

Author: TheElixZammuto

src/nvenc/nvenc_base.cpp

@@ -321,6 +321,22 @@ namespace nvenc {
         set_ref_frames(format_config.maxNumRefFramesInDPB, format_config.numRefL0, 5);
         set_minqp_if_enabled(config.min_qp_hevc);
         fill_h264_hevc_vui(format_config.hevcVUIParameters);
+        if (client_config.enableIntraRefresh == 1) {
+          if (get_encoder_cap(NV_ENC_CAPS_SUPPORT_INTRA_REFRESH)) {
+            format_config.enableIntraRefresh = 1;
+            format_config.intraRefreshPeriod = 300;
+            format_config.intraRefreshCnt = 299;
+            if (get_encoder_cap(NV_ENC_CAPS_SINGLE_SLICE_INTRA_REFRESH)) {
+              format_config.singleSliceIntraRefresh = 1;
+            }
+            else {
+              BOOST_LOG(warning) << "NvEnc: Single Slice Intra Refresh not supported";
+            }
+          }
+          else {
+            BOOST_LOG(error) << "NvEnc: Client asked for intra-refresh but the encoder does not support intra-refresh";
+          }
+        }
         break;
       }
 

src/rtsp.cpp

@@ -976,6 +976,7 @@ namespace rtsp_stream {
     args.try_emplace("x-ml-video.configuredBitrateKbps"sv, "0"sv);
     args.try_emplace("x-ss-general.encryptionEnabled"sv, "0"sv);
     args.try_emplace("x-ss-video[0].chromaSamplingType"sv, "0"sv);
+    args.try_emplace("x-ss-video[0].intraRefresh"sv, "0"sv);
 
     stream::config_t config;
 
@@ -1012,6 +1013,7 @@ namespace rtsp_stream {
       config.monitor.videoFormat = util::from_view(args.at("x-nv-vqos[0].bitStreamFormat"sv));
       config.monitor.dynamicRange = util::from_view(args.at("x-nv-video[0].dynamicRangeMode"sv));
       config.monitor.chromaSamplingType = util::from_view(args.at("x-ss-video[0].chromaSamplingType"sv));
+      config.monitor.enableIntraRefresh = util::from_view(args.at("x-ss-video[0].intraRefresh"sv));
 
       configuredBitrateKbps = util::from_view(args.at("x-ml-video.configuredBitrateKbps"sv));
     }

src/video.h

@@ -38,6 +38,8 @@ namespace video {
     int dynamicRange;
 
     int chromaSamplingType;  // 0 - 4:2:0, 1 - 4:4:4
+
+    int enableIntraRefresh;  // 0 - disabled, 1 - enabled
   };
 
   platf::mem_type_e