docs: add doxygen (#1004)

docs/source/source/src.rst

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+src
+===
+We are in process of improving the source code documentation. Code should be documented using Doxygen syntax.
+Some examples exist in `main.h` and `main.cpp`. In order for documentation within the code to appear in the
+rendered docs, the definition of the object must be in a header file, although the documentation itself can (and
+should) be in the source file.
+
+Example Documentation Blocks
+----------------------------
+
+**file.h**
+
+.. code-block:: cpp
+
+   // functions
+   int main(int argc, char *argv[]);
+
+**file.cpp** (with markdown)
+
+.. code-block:: cpp
+
+   /**
+    * @brief Main application entry point.
+    * @param argc The number of arguments.
+    * @param argv The arguments.
+    *
+    * EXAMPLES:
+    * ```cpp
+    * main(1, const char* args[] = {"hello", "markdown", nullptr});
+    * ```
+    */
+   int main(int argc, char *argv[]) {
+     // do stuff
+   }
+
+**file.cpp** (with ReStructuredText)
+
+.. code-block:: cpp
+
+   /**
+    * @brief Main application entry point.
+    * @param argc The number of arguments.
+    * @param argv The arguments.
+    * @rst
+    * EXAMPLES:
+    *
+    * .. code-block:: cpp
+    *    main(1, const char* args[] = {"hello", "rst", nullptr});
+    * @endrst
+    */
+   int main(int argc, char *argv[]) {
+     // do stuff
+   }
+
+Code
+----
+
+.. toctree::
+   :maxdepth: 2
+   :caption: src
+
+   src/main
+   src/audio
+   src/cbs
+   src/config
+   src/confighttp
+   src/crypto
+   src/httpcommon
+   src/input
+   src/move_by_copy
+   src/network
+   src/nvhttp
+   src/process
+   src/round_robin
+   src/rtsp
+   src/stream
+   src/sync
+   src/task_pool
+   src/thread_pool
+   src/thread_safe
+   src/upnp
+   src/utility
+   src/uuid
+   src/video
+   src/platform

docs/source/source/src/audio.rst

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+audio
+=====
+
+.. doxygenfile:: audio.h

docs/source/source/src/cbs.rst

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+cbs
+===
+
+.. doxygenfile:: cbs.h

docs/source/source/src/config.rst

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+config
+======
+
+.. doxygenfile:: config.h

docs/source/source/src/confighttp.rst

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+confighttp
+==========
+
+.. doxygenfile:: confighttp.h

docs/source/source/src/crypto.rst

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+crypto
+======
+
+.. doxygenfile:: crypto.h

docs/source/source/src/httpcommon.rst

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+httpcommon
+==========
+
+.. doxygenfile:: httpcommon.h

docs/source/source/src/input.rst

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+input
+=====
+
+.. doxygenfile:: input.h

docs/source/source/src/main.rst

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+main
+====
+
+.. doxygenfile:: main.h

docs/source/source/src/move_by_copy.rst

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+move_by_copy
+============
+
+.. doxygenfile:: move_by_copy.h

docs/source/source/src/network.rst

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+network
+=======
+
+.. doxygenfile:: network.h

docs/source/source/src/nvhttp.rst

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+nvhttp
+======
+
+.. doxygenfile:: nvhttp.h

docs/source/source/src/platform.rst

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+platform
+========
+
+.. toctree::
+   :maxdepth: 1
+
+   platform/common
+   platform/linux
+   platform/macos
+   platform/windows

docs/source/source/src/platform/common.rst

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+common
+======
+
+.. Todo:: Add common.h

docs/source/source/src/platform/linux.rst

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+linux
+=====
+
+.. toctree::
+   :maxdepth: 1
+
+   linux/cuda
+   linux/graphics
+   linux/misc
+   linux/vaapi
+   linux/wayland
+   linux/x11grab

docs/source/source/src/platform/linux/cuda.rst

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+cuda
+====
+
+.. Todo:: Add cuda.h

docs/source/source/src/platform/linux/graphics.rst

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+graphics
+========
+
+.. Todo:: Add graphics.h

docs/source/source/src/platform/linux/misc.rst

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+misc
+====
+
+.. Todo:: Add misc.h

docs/source/source/src/platform/linux/vaapi.rst

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+vaapi
+=====
+
+.. Todo:: Add vaapi.h

docs/source/source/src/platform/linux/wayland.rst

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+wayland
+=======
+
+.. Todo:: Add wayland.h

docs/source/source/src/platform/linux/x11grab.rst

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+x11grab
+=======
+
+.. Todo:: Add x11grab.h

docs/source/source/src/platform/macos.rst

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+macos
+=====
+
+.. toctree::
+   :maxdepth: 1
+
+   macos/av_audio
+   macos/av_img_t
+   macos/av_video
+   macos/misc
+   macos/nv12_zero_device

docs/source/source/src/platform/macos/av_audio.rst

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+av_audio
+========
+
+.. Todo:: Add av_audio.h

docs/source/source/src/platform/macos/av_img_t.rst

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+av_img_t
+========
+
+.. Todo:: Add av_img_t.h

docs/source/source/src/platform/macos/av_video.rst

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+av_video
+========
+
+.. Todo:: Add av_video.h

docs/source/source/src/platform/macos/misc.rst

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+misc
+====
+
+.. Todo:: Add misc.h

docs/source/source/src/platform/macos/nv12_zero_device.rst

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+nv12_zero_device
+================
+
+.. Todo:: Add nv12_zero_device.h

docs/source/source/src/platform/windows.rst

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+windows
+=======
+
+.. toctree::
+   :maxdepth: 1
+
+   windows/display
+   windows/misc
+   windows/PolicyConfig

docs/source/source/src/platform/windows/PolicyConfig.rst

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+PolicyConfig
+============
+
+.. Todo:: Add PolicyConfig.h

docs/source/source/src/platform/windows/display.rst

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+display
+=======
+
+.. Todo:: Add display.h

docs/source/source/src/platform/windows/misc.rst

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+misc
+====
+
+.. Todo:: Add misc.h

docs/source/source/src/process.rst

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+process
+=======
+
+.. doxygenfile:: process.h

docs/source/source/src/round_robin.rst

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+round_robin
+===========
+
+.. doxygenfile:: round_robin.h

docs/source/source/src/rtsp.rst

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+rtsp
+====
+
+.. doxygenfile:: rtsp.h

docs/source/source/src/stream.rst

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+stream
+======
+
+.. doxygenfile:: stream.h

docs/source/source/src/sync.rst

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+sync
+====
+
+.. doxygenfile:: sync.h

docs/source/source/src/task_pool.rst

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+tasl_pool
+=========
+
+.. doxygenfile:: task_pool.h

docs/source/source/src/thread_pool.rst

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+thread_pool
+===========
+
+.. doxygenfile:: thread_pool.h

docs/source/source/src/thread_safe.rst

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+thread_safe
+===========
+
+.. doxygenfile:: thread_safe.h

docs/source/source/src/upnp.rst

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+upnp
+====
+
+.. doxygenfile:: upnp.h

docs/source/source/src/utility.rst

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+utility
+=======
+
+.. Todo:: Add utility.h

docs/source/source/src/uuid.rst

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+uuid
+====
+
+.. doxygenfile:: uuid.h

docs/source/source/src/video.rst

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+video
+=====
+
+.. doxygenfile:: video.h