Add standalone NVENC encoder

src/nvenc/nvenc_config.h

@@ -0,0 +1,45 @@
+#pragma once
+
+namespace nvenc {
+
+  enum class nvenc_two_pass {
+    // Single pass, the fastest and no extra vram
+    disabled,
+
+    // Larger motion vectors being caught, faster and uses less extra vram
+    quarter_resolution,
+
+    // Better overall statistics, slower and uses more extra vram
+    full_resolution,
+  };
+
+  struct nvenc_config {
+    // Quality preset from 1 to 7, higher is slower
+    unsigned quality_preset = 1;
+
+    // Use optional preliminary pass for better motion vectors, bitrate distribution and stricter VBV(HRD), uses CUDA cores
+    nvenc_two_pass two_pass = nvenc_two_pass::disabled;
+
+    // Improves fades compression, uses CUDA cores
+    bool weighted_prediction = false;
+
+    // Allocate more bitrate to flat regions since they're visually more perceptible, uses CUDA cores
+    bool adaptive_quantization = false;
+
+    // Don't use QP below certain value, limits peak image quality to save bitrate
+    bool enable_min_qp = false;
+
+    // Min QP value for H.264 when enable_min_qp is selected
+    unsigned min_qp_h264 = 19;
+
+    // Min QP value for HEVC when enable_min_qp is selected
+    unsigned min_qp_hevc = 23;
+
+    // Use CAVLC entropy coding in H.264 instead of CABAC, not relevant and here for historical reasons
+    bool h264_cavlc = false;
+
+    // Add filler data to encoded frames to stay at target bitrate, mainly for testing
+    bool insert_filler_data = false;
+  };
+
+}  // namespace nvenc