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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}
-Plays movies - Currently Windows and Mac only.
+wxMediaCtrl is a class that allows a way to convieniently display types of
+media, such as videos, audio files, natively through native codecs.
+
+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.
\wxheading{Derived from}
\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 -
+sense 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, then call \helpref{wxMediaCtrl::Play}{wxmediactrlplay}
+to show the video/audio of the media.
+
+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.
+
+\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. Requires wxUSE\_DIRECTSHOW to be
+enabled, requires linkage with the static library strmiids.lib,
+and is available on Windows Only.}
+\twocolitem{{\bf wxMEDIABACKEND\_QUICKTIME}}{
+Use QuickTime. Windows and Mac Only. WARNING: On Mac Systems lower than OSX 10.2 this defaults to emulating window positioning and suffers from several bugs, including not working correctly embedded in a wxNotebook. }
+\twocolitem{{\bf wxMEDIABACKEND\_MCI}}{
+Use Media Command Interface. Windows Only. }
+\twocolitem{{\bf wxMEDIABACKEND\_GSTREAMER}}{
+Use GStreamer. Unix Only. }
+\end{twocollist}
\membersection{wxMediaCtrl::wxMediaCtrl}\label{wxmediactrlwxmediactrl}
-\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}{\void}
+Default constructor - you \tt{must} call Create before calling any other methods
+of wxMediaCtrl.
-\func{}{wxMediaCtrl}{\void}
+\func{}{wxMediaCtrl}{
+ \param{wxWindow* }{parent},
+ \param{const wxString\& }{fileName = wxT("")},
+ \param{wxWindowID }{id},
+ \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}
+ }
-Contructors
+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{const wxString\& }{fileName = wxT("")},
+ \param{wxWindowID }{id},
+ \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}
+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{driver}{Reserved for future use.}
\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::Length}\label{wxmediactrlgetduration}
-\func{long}{GetDuration}{\void}
+\func{wxFileOffset}{GetDuration}{\void}
-Obtains the length - the total amount of time the movie has
+Obtains the length - the total amount of time the movie has in milliseconds.
-\membersection{wxMediaCtrl::GetPosition}\label{wxmediactrlgetposition}
+\membersection{wxMediaCtrl::Tell}\label{wxmediactrlgetposition}
-\func{long}{GetPosition}{\void}
+\func{wxFileOffset}{GetPosition}{\void}
-Obtains the current position in time within the movie.
+Obtains the current position in time within the movie in milliseconds.
\membersection{wxMediaCtrl::GetState}\label{wxmediactrlgetstate}
\func{bool}{Load}{\param{const wxString\& }{fileName}}
-Loads the file that \tt{fileName} refers to.
-
-Unlike Create, you must manually call Play() to start playing the file.
-
+Loads the file that \tt{fileName} refers to. Returns false if loading fails.
\membersection{wxMediaCtrl::Pause}\label{wxmediactrlpause}
Resumes playback of the movie.
-\membersection{wxMediaCtrl::SetPosition}\label{wxmediactrlsetposition}
+\membersection{wxMediaCtrl::Seek}\label{wxmediactrlsetposition}
-\func{bool}{SetPosition}{\param{long }{where}}
+\func{wxFileOffset}{SetPosition}{\param{wxFileOffset }{where}, \param{wxSeekMode }{mode}}
Seeks to a position within the movie.
\func{bool}{Stop}{\void}
-Stops the movie and rewinds the movie to the start.
+Stops the media.
+
+See \helpref{Operation}{operationwxmediactrl} for an overview of how stopping works.
+
projects / wxWidgets.git / blobdiff