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DOCS/client_api_examples/README: rewrite
The new one is much more detailed. Also add part of it to the libmpv doxygen.
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Client API examples
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===================
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# Client API examples
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All these examples use the mpv client API through libmpv.
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cocoa
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-----
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## Where are the docs?
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The libmpv C API is documented directly in the header files (on normal Unix
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systems, this is in `/usr/include/mpv/client.h`.
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libmpv merely gives you access to mpv's command interface, which is documented
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here:
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* Options (`mpv_set_option()` and friends): http://mpv.io/manual/master/#options
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* Commands (`mpv_command()` and friends): http://mpv.io/manual/master/#list-of-input-commands
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* Properties (`mpv_set_property()` and friends): http://mpv.io/manual/master/#properties
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Essentially everything is done with them, including loading a file, retrieving
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playback progress, and so on.
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## Methods of embedding the video window
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All of these examples concentrate on how to integrate mpv's video renderers
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with your own GUI. This is generally the hardest part. libmpv enforces a
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somewhat efficient video output method, rather than e.g. returning a RGBA
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surface in memory for each frame. The latter would be prohibitively inefficient,
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because it would require conversion on the CPU. The goal is also not requiring
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the API users to reinvent their own video rendering/scaling/presentation
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mechanisms.
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There are currently 2 methods of embedding video.
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### Native window embedding
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This uses the platform's native method of nesting multiple windows. For example,
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Linux/X11 can nest a window from a completely different process. The nested
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window can redraw contents on its own, and receive user input if the user
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interacts with this window.
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libmpv lets you specify a parent window for its own video window via the `wid`
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option. Then libmpv will create its window with your window as parent, and
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render its video inside of it.
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This method is highly OS-dependent. Some behavior is OS-specific. There are
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problems with focusing on X11 (the ancient X11 focus policy mismatches with
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that of modern UI toolkits - it's normally worked around, but this is not
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easily possible with raw window embedding). It seems to have stability problems
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on OSX when using the Qt toolkit.
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### OpenGL embedding
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This method lets you use libmpv's OpenGL renderer directly. You create an
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OpenGL context, and then use `mpv_opengl_cb_draw()` to render the video on
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each frame.
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This is more complicated, because libmpv will work directly on your own OpenGL
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state. It's also not possible to have mpv automatically receive user input.
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You will have to simulate this with the `mouse`/`keypress`/`keydown`/`keyup`
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commands.
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You also get much more flexibility. For example, you can actually render your
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own OSD on top of the video, something that is not possible with raw window
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embedding.
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### Which one to use?
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Due to the various platform-specific behavior and problems (in particular on
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OSX), OpenGL embedding is recommended. If you're not comfortable with requiring
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OpenGL, or want to support "direct" video output such as vdpau (which might
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win when it comes to performance and energy-saving), you should probably
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support both methods if possible.
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## List of examples
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### cocoa
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Shows how to embed the mpv video window in Objective-C/Cocoa.
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qt
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--
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### cocoa-openglcb
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Similar to the cocoa sample, but shows how to integrate mpv's OpenGL renderer
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using libmpv's opengl-cb API. Since it does not require complicated interaction
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with Cocoa elements from different libraries, it's more robust.
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### qt
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Shows how to embed the mpv video window in Qt (using normal desktop widgets).
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qml
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---
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### qml
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Shows how to use mpv's OpenGL video renderer in QtQuick2 with QML.
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Shows how to use mpv's OpenGL video renderer in QtQuick2 with QML. Uses the
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opengl-cb API for video. Since it does not rely on embedding "foreign" native
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Windows, it's usually more robust, potentially faster, and it's easier to
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control how your GUI interacts with the video. It's trivial to create OSD
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overlays with QML-native graphical elements as well.
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qml_direct
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----------
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### qml_direct
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Alternative example, which typically avoids a FBO indirection. Might be
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slightly faster, but is less flexible and harder to use.
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slightly faster, but is less flexible and harder to use. Uses the
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opengl-cb API for video.
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sdl
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---
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### sdl
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Show how to embed the mpv OpenGL renderer in SDL.
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Show how to embed the mpv OpenGL renderer in SDL. Uses the opengl-cb API for
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video.
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simple
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------
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### simple
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Very primitive terminal-only example. Shows some most basic API usage.
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@ -49,6 +49,22 @@ extern "C" {
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* 2) Using mpv as a library with mpv_create(). This basically allows embedding
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* mpv in other applications.
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*
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* Documentation
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* -------------
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*
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* The libmpv C API is documented directly in this header. Note that most
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* actual interaction with this player is done through
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* options/commands/properties, which can be accessed through this API.
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* Essentially everything is done with them, including loading a file,
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* retrieving playback progress, and so on.
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*
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* These are documented elsewhere:
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* * http://mpv.io/manual/master/#options
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* * http://mpv.io/manual/master/#list-of-input-commands
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* * http://mpv.io/manual/master/#properties
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*
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* You can also look at the examples in DOCS/client_api_examples/.
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*
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* Event loop
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* ----------
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*
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