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%% Name: mediactrl.tex
%% Purpose: wxMediaCtrl docs
%% Author: Ryan Norton <wxprojects@comcast.net>
%% RCS-ID: $Id$
%% Copyright: (c) Ryan Norton
%% License: wxWindows license
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\section{\class{wxMediaCtrl}}\label{wxmediactrl}
-wxMediaCtrl is a class that allows a way to convieniently display types of media,
-such as videos, audio files, natively through native codecs.
+wxMediaCtrl is a class for displaying types of
+media, such as videos, audio files, natively through native codecs.
-On Windows wxMediaCtrl uses DirectShow, and on Macintosh wxMediaCtrl uses QuickTime.
+wxMediaCtrl uses native backends to render media, for example on Windows
+there is a ActiveMovie/DirectShow backend, and on Macintosh there is a
+QuickTime backend.
-wxMediaCtrl is not currently available on unix systems.
+\wxheading{See also}
+
+\helpref{wxMediaEvent}{wxmediaevent}
\wxheading{Derived from}
-\helpref{wxControl}{wxcontrol}
+\helpref{wxControl}{wxcontrol}\\
+\helpref{wxWindow}{wxwindow}\\
+\helpref{wxEvtHandler}{wxevthandler}\\
+\helpref{wxObject}{wxobject}
\wxheading{Include files}
<wx/mediactrl.h>
+\wxheading{Library}
+
+\helpref{wxMedia}{librarieslist}
+
\latexignore{\rtfignore{\wxheading{Members}}}
+\membersection{Rendering media}\label{renderingmediawxmediactrl}
+
+Depending upon the backend, wxMediaCtrl can render
+and display pretty much any kind of media that the native system can -
+such as an image, mpeg video, or mp3 (without license restrictions -
+since it relies on native system calls that may not technically
+have mp3 decoding available, for example, it falls outside the
+realm of licensing restrictions).
+
+For general operation, all you need to do is call
+\helpref{wxMediaCtrl::Load}{wxmediactrlload} to load the file
+you want to render, catch the EVT\_MEDIA\_LOADED event,
+and then call \helpref{wxMediaCtrl::Play}{wxmediactrlplay}
+to show the video/audio of the media in that event.
+
+More complex operations are generally more heavily dependant on the
+capabilities of the backend. For example, QuickTime cannot set
+the playback rate of certain streaming media - while DirectShow is
+slightly more flexible in that regard.
+
+
+\membersection{Operation}\label{operationwxmediactrl}
+
+When wxMediaCtrl plays a file, it plays until the stop position
+is reached (currently the end of the file/stream). Right before
+it hits the end of the stream, it fires off a EVT\_MEDIA\_STOP
+event to its parent window, at which point the event handler
+can choose to veto the event, preventing the stream from actually
+stopping.
+
+Example:
+\begin{verbatim}
+//connect to the media event
+this->Connect(wxMY_ID, wxEVT_MEDIA_STOP, (wxObjectEventFunction)
+(wxEventFunction)(wxMediaEventFunction) &MyFrame::OnMediaStop);
+
+//...
+void MyFrame::OnMediaStop(const wxMediaEvent& evt)
+{
+ if(bUserWantsToSeek)
+ {
+ m_mediactrl->SetPosition(
+ m_mediactrl->GetDuration() << 1
+ );
+ evt.Veto();
+ }
+}
+\end{verbatim}
+
+When wxMediaCtrl stops, either by the EVT\_MEDIA\_STOP not being
+vetoed, or by manually calling
+\helpref{wxMediaCtrl::Stop}{wxmediactrlstop}, where it actually
+stops is not at the beginning, rather, but at the beginning of
+the stream. That is, when it stops and play is called, playback
+is gauranteed to start at the beginning of the media. This is
+because some streams are not seekable, and when stop is called
+on them they return to the beginning, thus wxMediaCtrl tries
+to keep consistant for all types of media.
+
+Note that when changing the state of the media through Play()
+and other methods, the media may not actually be in the
+wxMEDIASTATE\_PLAYING, for example. If you are relying on the
+media being in certain state catch the event relevant to the state.
+See \helpref{wxMediaEvent}{wxmediaevent} for the kinds of events
+that you can catch.
+
+
+\membersection{Video size}\label{videosizewxmediactrl}
+
+By default, wxMediaCtrl will scale the size of the video to the
+requested amount passed to either it's constructor or Create().
+After calling Load or performing an equivilant operation, you
+can subsequently obtain the "real" size of the video (if there
+is any) by calling GetBestSize(). Note that the actual result
+on the display will be slightly different when ShowPlayerControls
+is activated and the actual video size will be less then
+specified due to the extra controls provided by the native toolkit.
+In addition, the backend may modify GetBestSize() to include the
+size of the extra controls - so if you want the real size of the
+video just disable ShowPlayerControls().
+
+The idea with setting GetBestSize to the size of the video is
+that GetBestSize is a wxWindow-derived function that is called
+when sizers on a window recalculate. What this means is that
+if you use sizers by default the video will show in it's
+original size without any extra assistance needed from the user.
+
+
+\membersection{Player controls}\label{playercontrolswxmediactrl}
+
+Normally, when you use wxMediaCtrl it is just a window for the video to
+play in. However, some toolkits have their own media player interface.
+For example, QuickTime generally has a bar below the video with a slider.
+A special feature available to wxMediaCtrl, you can use the toolkit's interface instead of
+making your own by using the \helpref{ShowPlayerControls()}{wxmediactrlshowplayercontrols}
+function. There are several options for the flags parameter, with
+the two general flags being wxMEDIACTRLPLAYERCONTROLS\_NONE which turns off
+the native interface, and wxMEDIACTRLPLAYERCONTROLS\_DEFAULT which lets
+wxMediaCtrl decide what native controls on the interface. Be sure to review
+the caveats outlined in \helpref{Video size}{videosizewxmediactrl} before
+doing so.
+
+
+\membersection{Choosing a backend}\label{choosingbackendwxmediactrl}
+
+Generally, you should almost certainly leave this part up to
+wxMediaCtrl - but if you need a certain backend for a particular
+reason, such as QuickTime for playing .mov files, all you need
+to do to choose a specific backend is to pass the
+name of the backend class to
+\helpref{wxMediaCtrl::Create}{wxmediactrlcreate}.
+
+The following are valid backend identifiers -
+\twocolwidtha{7cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{{\bf wxMEDIABACKEND\_DIRECTSHOW}}{
+Use ActiveMovie/DirectShow. Uses the native ActiveMovie
+(I.E. DirectShow) control. Default backend on Windows and
+supported by nearly all Windows versions, even some
+Windows CE versions. May display a windows media player
+logo while inactive. }
+\twocolitem{{\bf wxMEDIABACKEND\_QUICKTIME}}{
+Use QuickTime. Mac Only.
+WARNING: May not working correctly embedded in a wxNotebook.
+}
+\twocolitem{{\bf wxMEDIABACKEND\_GSTREAMER}}{
+Use GStreamer. Unix Only. Requires GStreamer 0.8 along
+with at the very least the xvimagesink, xoverlay, and
+gst-play modules of gstreamer to function. You need the correct
+modules to play the relavant files, for example the mad module
+to play mp3s, etc.}
+\twocolitem{{\bf wxMEDIABACKEND\_WMP10}}{
+Uses Windows Media Player 10 (Windows only) - works on mobile
+machines with Windows Media Player 10 and desktop machines with
+either Windows Media Player 9 or 10
+}
+\end{twocollist}
+
+Note that other backends such as wxMEDIABACKEND\_MCI can now be
+found at wxCode.
+
+\membersection{Creating a backend}\label{creatingabackendwxmediactrl}
+
+Creating a backend for wxMediaCtrl is a rather simple process. Simply derive
+from wxMediaBackendCommonBase and implement the methods you want. The methods
+in wxMediaBackend correspond to those in wxMediaCtrl except for CreateControl
+which does the actual creation of the control, in cases where a custom control
+is not needed you may simply call wxControl::Create.
+
+You need to make sure to use the DECLARE\_CLASS and IMPLEMENT\_CLASS macros.
+
+The only real tricky part is that you need to make sure the file in compiled
+in, which if there are just backends in there will not happen and you may need
+to use a force link hack (see http://www.wxwidgets.org/wiki/index.php/RTTI).
+
+This is a rather simple example of how to create a backend in the
+\helpref{wxActiveXContainer}{wxactivexcontainer} documentation.
+
\membersection{wxMediaCtrl::wxMediaCtrl}\label{wxmediactrlwxmediactrl}
\func{}{wxMediaCtrl}{\void}
Default constructor - you \tt{must} call Create before calling any other methods
of wxMediaCtrl.
-\func{}{wxMediaCtrl}{\param{wxWindow* }{parent}, \param{wxWindowID }{id}, \param{const wxString\& }{fileName}, \param{const wxString\& }{label = wxT("")}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize}, \param{long }{style = 0}, \param{long }{driver = 0}, \param{const wxString\& }{name = wxPanelNameStr}}
+\func{}{wxMediaCtrl}{
+ \param{wxWindow* }{parent},
+ \param{wxWindowID }{id},
+ \param{const wxString\& }{fileName = wxT("")},
+ \param{const wxPoint\& }{pos = wxDefaultPosition},
+ \param{const wxSize\& }{size = wxDefaultSize},
+ \param{long }{style = 0},
+ \param{const wxString\& }{szBackend = wxT("")},
+ \param{const wxValidator& }{validator = wxDefaultValidator},
+ \param{const wxString\& }{name = wxPanelNameStr}
+ }
-Constructor that calls Create. You may prefer to call Create directly to check to see if wxMediaCtrl is available
-on the system.
+Constructor that calls \helpref{Create}{wxmediactrlcreate}. You may prefer to call \helpref{Create}{wxmediactrlcreate} directly to check to see if wxMediaCtrl is available on the system.
\docparam{parent}{parent of this control. Must not be NULL.}
\docparam{id}{id to use for events}
-\docparam{fileName}{If not empty, loads this file and starts playing it immediately.}
+\docparam{fileName}{If not empty, the path of a file to open.}
\docparam{pos}{Position to put control at.}
\docparam{size}{Size to put the control at and to stretch movie to.}
\docparam{style}{Optional styles.}
-\docparam{driver}{Reserved for future use.}
+\docparam{szBackend}{Name of backend you want to use, leave blank to make
+wxMediaCtrl figure it out.}
+\docparam{validator}{validator to use.}
\docparam{name}{Window name.}
\membersection{wxMediaCtrl::Create}\label{wxmediactrlcreate}
-\func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID }{id}, \param{const wxString\& }{fileName}, \param{const wxString\& }{label = wxT("")}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize}, \param{long }{style = 0}, \param{long }{driver = 0}, \param{const wxString\& }{name = wxPanelNameStr}}
+\func{bool}{Create}{
+ \param{wxWindow* }{parent},
+ \param{wxWindowID }{id},
+ \param{const wxString\& }{fileName = wxT("")},
+ \param{const wxPoint\& }{pos = wxDefaultPosition},
+ \param{const wxSize\& }{size = wxDefaultSize},
+ \param{long }{style = 0},
+ \param{const wxString\& }{szBackend = wxT("")},
+ \param{const wxValidator& }{validator = wxDefaultValidator},
+ \param{const wxString\& }{name = wxPanelNameStr}
+ }
-Creates this control. Returns \tt{false} if it can't load the movie located at \tt{fileName} or it cannot load
-one of its native backends.
+Creates this control. Returns \tt{false} if it can't load the movie located at \tt{fileName} or it cannot load one of its native backends.
+
+If you specify a file to open via \tt{fileName} and you don't specify a backend to use, wxMediaCtrl tries each of its backends until one that can render the path referred to by \tt{fileName} can be found.
\docparam{parent}{parent of this control. Must not be NULL.}
\docparam{id}{id to use for events}
-\docparam{fileName}{If not empty, loads this file and starts playing it immediately.}
+\docparam{fileName}{If not empty, the path of a file to open.}
\docparam{pos}{Position to put control at.}
\docparam{size}{Size to put the control at and to stretch movie to.}
\docparam{style}{Optional styles.}
-\docparam{driver}{Reserved for future use.}
+\docparam{szBackend}{Name of backend you want to use, leave blank to make
+wxMediaCtrl figure it out.}
+\docparam{validator}{validator to use.}
\docparam{name}{Window name.}
-\membersection{wxMediaCtrl::GetDuration}\label{wxmediactrlgetduration}
+\membersection{wxMediaCtrl::GetBestSize}\label{wxmediactrlgetbestsize}
-\func{long}{GetDuration}{\void}
+\func{wxSize}{GetBestSize}{\void}
-Obtains the length - the total amount of time the movie has in milliseconds.
+Obtains the best size relative to the original/natural size of the
+video, if there is any. See \helpref{Video size}{videosizewxmediactrl}
+for more information.
-\membersection{wxMediaCtrl::GetPosition}\label{wxmediactrlgetposition}
+\membersection{wxMediaCtrl::GetPlaybackRate}\label{wxmediactrlgetplaybackrate}
-\func{long}{GetPosition}{\void}
+\func{double}{GetPlaybackrate}{\void}
+
+Obtains the playback rate, or speed of the media. \tt{1.0} represents normal
+speed, while \tt{2.0} represents twice the normal speed of the media, for
+example. Not supported on the GStreamer (Unix) backend.
+Returns 0 on failure.
-Obtains the current position in time within the movie in milliseconds.
+
+\membersection{wxMediaCtrl::GetVolume}\label{wxmediactrlgetvolume}
+
+\func{double}{GetVolume}{\void}
+
+Gets the volume of the media from a 0.0 to 1.0 range. Note that due to rounding
+and other errors this may not be the exact value sent to SetVolume.
\membersection{wxMediaCtrl::GetState}\label{wxmediactrlgetstate}
\func{wxMediaCtrlState}{GetState}{\void}
-Obtains the state the playback of the movie is in -
+Obtains the state the playback of the media is in -
\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\end{twocollist}
+\membersection{wxMediaCtrl::Length}\label{wxmediactrllength}
+
+\func{wxFileOffset}{Length}{\void}
+
+Obtains the length - the total amount of time the movie has in milliseconds.
+
+
\membersection{wxMediaCtrl::Load}\label{wxmediactrlload}
\func{bool}{Load}{\param{const wxString\& }{fileName}}
Loads the file that \tt{fileName} refers to. Returns false if loading fails.
+
+\membersection{wxMediaCtrl::Load}\label{wxmediactrlloaduri}
+
+\func{bool}{Load}{\param{const wxURI\& }{uri}}
+
+Loads the location that \tt{uri} refers to. Note that this is very implementation-dependant, although HTTP URI/URLs are generally supported, for example. Returns false if loading fails.
+
+
+\membersection{wxMediaCtrl::Load}\label{wxmediactrlloaduriwithproxy}
+
+\func{bool}{Load}{\param{const wxURI\& }{uri}, \param{const wxURI\& }{proxy}}
+
+Loads the location that \tt{uri} refers to with the proxy \tt{proxy}. Not implemented on most backends so it should be called with caution. Returns false if loading fails.
+
+
+\membersection{wxMediaCtrl::LoadURI}\label{wxmediactrlloaduriliteral}
+
+\func{bool}{LoadURI}{\param{const wxURI\& }{uri}}
+
+Same as \helpref{Load}{wxmediactrlloaduri}. Kept for wxPython compatability.
+
+
+\membersection{wxMediaCtrl::LoadURIWithProxy}\label{wxmediactrlloaduriwithproxyliteral}
+
+\func{bool}{LoadURIWithProxy}{\param{const wxURI\& }{uri}, \param{const wxURI\& }{proxy}}
+
+Same as \helpref{Load}{wxmediactrlloaduriwithproxy}. Kept for wxPython compatability.
+
+
\membersection{wxMediaCtrl::Pause}\label{wxmediactrlpause}
\func{bool}{Pause}{\void}
Resumes playback of the movie.
-\membersection{wxMediaCtrl::SetPosition}\label{wxmediactrlsetposition}
+\membersection{wxMediaCtrl::Seek}\label{wxmediactrlsetposition}
-\func{bool}{SetPosition}{\param{long }{where}}
+\func{wxFileOffset}{Seek}{\param{wxFileOffset }{where}, \param{wxSeekMode }{mode}}
Seeks to a position within the movie.
+\membersection{wxMediaCtrl::SetPlaybackRate}\label{wxmediactrlsetplaybackrate}
+
+\func{bool}{SetPlaybackRate}{\param{double }{dRate}}
+
+Sets the playback rate, or speed of the media, to that referred by \tt{dRate}.
+\tt{1.0} represents normal speed, while \tt{2.0} represents twice the normal
+speed of the media, for example. Not supported on the GStreamer (Unix) backend.
+Returns true if successful.
+
+
+\membersection{wxMediaCtrl::SetVolume}\label{wxmediactrlsetvolume}
+
+\func{bool}{SetVolume}{\param{double }{dVolume}}
+
+Sets the volume of the media from a 0.0 to 1.0 range to that referred
+by \tt{dVolume}. \tt{1.0} represents full volume, while \tt{0.5}
+represents half (50 percent) volume, for example. Note that this may not be
+exact due to conversion and rounding errors, although setting the volume to
+full or none is always exact. Returns true if successful.
+
+
+\membersection{wxMediaCtrl::ShowPlayerControls}\label{wxmediactrlshowplayercontrols}
+
+\func{bool}{ShowPlayerControls}{\param{wxMediaCtrlPlayerControls }{flags = wxMEDIACTRLPLAYERCONTROLS\_DEFAULT}}
+
+A special feature to wxMediaCtrl. Applications using native toolkits such as
+QuickTime usually have a scrollbar, play button, and more provided to
+them by the toolkit. By default wxMediaCtrl does not do this. However, on
+the directshow and quicktime backends you can show or hide the native controls
+provided by the underlying toolkit at will using ShowPlayerControls. Simply
+calling the function with default parameters tells wxMediaCtrl to use the
+default controls provided by the toolkit. The function takes a
+\tt{wxMediaCtrlPlayerControls} enumeration as follows:
+
+\twocolwidtha{7cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{{\bf wxMEDIACTRLPLAYERCONTROLS\_NONE}}{No controls. return wxMediaCtrl to it's default state.}
+\twocolitem{{\bf wxMEDIACTRLPLAYERCONTROLS\_STEP}}{Step controls like fastfoward, step one frame etc.}
+\twocolitem{{\bf wxMEDIACTRLPLAYERCONTROLS\_VOLUME}}{Volume controls like the speaker icon, volume slider, etc.}
+\twocolitem{{\bf wxMEDIACTRLPLAYERCONTROLS\_DEFAULT}}{Default controls for the toolkit. Currently a typedef for wxMEDIACTRLPLAYERCONTROLS\_STEP and wxMEDIACTRLPLAYERCONTROLS\_VOLUME.}
+\end{twocollist}
+
+For more see \helpref{Player controls}{playercontrolswxmediactrl}. Currently
+only implemented on the QuickTime and DirectShow backends. The function
+returns true on success.
+
+
\membersection{wxMediaCtrl::Stop}\label{wxmediactrlstop}
\func{bool}{Stop}{\void}
Stops the media.
+
+See \helpref{Operation}{operationwxmediactrl} for an overview of how
+stopping works.
+
+
+\membersection{wxMediaCtrl::Tell}\label{wxmediactrlgetposition}
+
+\func{wxFileOffset}{Tell}{\void}
+
+Obtains the current position in time within the movie in milliseconds.
+
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