Add standalone NVENC encoder

src/video_colorspace.h

@@ -0,0 +1,56 @@
+#pragma once
+
+extern "C" {
+#include <libavutil/pixfmt.h>
+}
+
+namespace video {
+
+  enum class colorspace_e {
+    rec601,
+    rec709,
+    bt2020sdr,
+    bt2020,
+  };
+
+  struct sunshine_colorspace_t {
+    colorspace_e colorspace;
+    bool full_range;
+    unsigned bit_depth;
+  };
+
+  bool
+  colorspace_is_hdr(const sunshine_colorspace_t &colorspace);
+
+  // Declared in video.h
+  struct config_t;
+
+  sunshine_colorspace_t
+  colorspace_from_client_config(const config_t &config, bool hdr_display);
+
+  struct avcodec_colorspace_t {
+    AVColorPrimaries primaries;
+    AVColorTransferCharacteristic transfer_function;
+    AVColorSpace matrix;
+    AVColorRange range;
+    int software_format;
+  };
+
+  avcodec_colorspace_t
+  avcodec_colorspace_from_sunshine_colorspace(const sunshine_colorspace_t &sunshine_colorspace);
+
+  struct alignas(16) color_t {
+    float color_vec_y[4];
+    float color_vec_u[4];
+    float color_vec_v[4];
+    float range_y[2];
+    float range_uv[2];
+  };
+
+  const color_t *
+  color_vectors_from_colorspace(const sunshine_colorspace_t &colorspace);
+
+  const color_t *
+  color_vectors_from_colorspace(colorspace_e colorspace, bool full_range);
+
+}  // namespace video