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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: mediactrl.h
3 // Purpose: interface of wxMediaEvent, wxMediaCtrl
4 // Author: wxWidgets team
5 // Licence: wxWindows licence
6 /////////////////////////////////////////////////////////////////////////////
7
8
9 enum wxMediaCtrlPlayerControls
10 {
11 /** No controls. return wxMediaCtrl to its default state. */
12 wxMEDIACTRLPLAYERCONTROLS_NONE = 0,
13
14 /** Step controls like fastforward, step one frame etc. */
15 wxMEDIACTRLPLAYERCONTROLS_STEP = 1 << 0,
16
17 /** Volume controls like the speaker icon, volume slider, etc. */
18 wxMEDIACTRLPLAYERCONTROLS_VOLUME = 1 << 1,
19
20 /** Default controls for the toolkit. Currently a combination for
21 @c wxMEDIACTRLPLAYERCONTROLS_STEP and @c wxMEDIACTRLPLAYERCONTROLS_VOLUME. */
22 wxMEDIACTRLPLAYERCONTROLS_DEFAULT =
23 wxMEDIACTRLPLAYERCONTROLS_STEP |
24 wxMEDIACTRLPLAYERCONTROLS_VOLUME
25 };
26
27 /**
28 @class wxMediaEvent
29
30 Event wxMediaCtrl uses.
31
32 @beginEventTable{wxMediaEvent}
33 @event{EVT_MEDIA_LOADED(id\, func)}
34 Sent when a media has loaded enough data that it can start playing.
35 @event{EVT_MEDIA_STOP(id\, func)}
36 Sent when a media has switched to the @c wxMEDIASTATE_STOPPED state.
37 You may be able to Veto this event to prevent it from stopping,
38 causing it to continue playing - even if it has reached that end of
39 the media (note that this may not have the desired effect - if you
40 want to loop the media, for example, catch the @c EVT_MEDIA_FINISHED
41 and play there instead).
42 @event{EVT_MEDIA_FINISHED(id\, func)}
43 Sent when a media has finished playing in a wxMediaCtrl.
44 @event{EVT_MEDIA_STATECHANGED(id\, func)}
45 Sent when a media has switched its state (from any media state).
46 @event{EVT_MEDIA_PLAY(id\, func)}
47 Sent when a media has switched to the @c wxMEDIASTATE_PLAYING state.
48 @event{EVT_MEDIA_PAUSE(id\, func)}
49 Sent when a media has switched to the @c wxMEDIASTATE_PAUSED state.
50 @endEventTable
51
52 @library{wxmedia}
53 @category{events}
54 */
55 class wxMediaEvent : public wxNotifyEvent
56 {
57 public:
58 /** Default ctor. */
59 wxMediaEvent(wxEventType commandType = wxEVT_NULL, int winid = 0);
60 };
61
62
63
64 /**
65 @class wxMediaCtrl
66
67 wxMediaCtrl is a class for displaying types of media, such as videos, audio
68 files, natively through native codecs.
69
70 wxMediaCtrl uses native backends to render media, for example on Windows
71 there is a ActiveMovie/DirectShow backend, and on Macintosh there is a
72 QuickTime backend.
73
74
75 @section mediactrl_rendering_media Rendering media
76
77 Depending upon the backend, wxMediaCtrl can render and display pretty much any
78 kind of media that the native system can - such as an image, mpeg video, or mp3
79 (without license restrictions - since it relies on native system calls that may
80 not technically have mp3 decoding available, for example, it falls outside
81 the realm of licensing restrictions).
82
83 For general operation, all you need to do is call Load() to load the file you
84 want to render, catch the @c EVT_MEDIA_LOADED event, and then call Play()
85 to show the video/audio of the media in that event.
86
87 More complex operations are generally more heavily dependent on the capabilities
88 of the backend. For example, QuickTime cannot set the playback rate of certain
89 streaming media - while DirectShow is slightly more flexible in that regard.
90
91 @section mediactrl_operation Operation
92
93 When wxMediaCtrl plays a file, it plays until the stop position is reached
94 (currently the end of the file/stream). Right before it hits the end of the stream,
95 it fires off a @c EVT_MEDIA_STOP event to its parent window, at which point the event
96 handler can choose to veto the event, preventing the stream from actually stopping.
97
98 Example:
99
100 @code
101 //connect to the media event
102 this->Connect(wxMY_ID, wxEVT_MEDIA_STOP, (wxObjectEventFunction)
103 (wxEventFunction)(wxMediaEventFunction) &MyFrame::OnMediaStop);
104
105 //...
106 void MyFrame::OnMediaStop(const wxMediaEvent& evt)
107 {
108 if(bUserWantsToSeek)
109 {
110 m_mediactrl->SetPosition(
111 m_mediactrl->GetDuration() << 1
112 );
113 evt.Veto();
114 }
115 }
116 @endcode
117
118 When wxMediaCtrl stops, either by the @c EVT_MEDIA_STOP not being vetoed, or
119 by manually calling Stop(), where it actually stops is not at the beginning,
120 rather, but at the beginning of the stream. That is, when it stops and play
121 is called, playback is guaranteed to start at the beginning of the media.
122 This is because some streams are not seekable, and when stop is called on
123 them they return to the beginning, thus wxMediaCtrl tries to keep consistent
124 for all types of media.
125
126 Note that when changing the state of the media through Play() and other methods,
127 the media may not actually be in the @c wxMEDIASTATE_PLAYING, for example.
128 If you are relying on the media being in certain state catch the event relevant
129 to the state. See wxMediaEvent for the kinds of events that you can catch.
130
131
132 @section mediactrl_video_size Video size
133
134 By default, wxMediaCtrl will scale the size of the video to the requested
135 amount passed to either its constructor or Create().
136 After calling wxMediaCtrl::Load or performing an equivalent operation,
137 you can subsequently obtain the "real" size of the video (if there is any)
138 by calling wxMediaCtrl::GetBestSize(). Note that the actual result on the
139 display will be slightly different when wxMediaCtrl::ShowPlayerControls is
140 activated and the actual video size will be less than specified due to the
141 extra controls provided by the native toolkit.
142 In addition, the backend may modify wxMediaCtrl::GetBestSize() to include
143 the size of the extra controls - so if you want the real size of the video
144 just disable wxMediaCtrl::ShowPlayerControls().
145
146 The idea with setting wxMediaCtrl::GetBestSize() to the size of the video is
147 that GetBestSize() is a wxWindow-derived function that is called when sizers
148 on a window recalculate.
149 What this means is that if you use sizers by default the video will show in
150 its original size without any extra assistance needed from the user.
151
152
153 @section mediactrl_player_controls Player controls
154
155 Normally, when you use wxMediaCtrl it is just a window for the video to play in.
156 However, some toolkits have their own media player interface.
157 For example, QuickTime generally has a bar below the video with a slider.
158 A special feature available to wxMediaCtrl, you can use the toolkits interface
159 instead of making your own by using the ShowPlayerControls() function.
160 There are several options for the flags parameter, with the two general flags
161 being @c wxMEDIACTRLPLAYERCONTROLS_NONE which turns off the native interface,
162 and @c wxMEDIACTRLPLAYERCONTROLS_DEFAULT which lets wxMediaCtrl decide what
163 native controls on the interface.
164 Be sure to review the caveats outlined in @ref mediactrl_video_size before doing so.
165
166
167 @section mediactrl_choosing_backend Choosing a backend
168
169 Generally, you should almost certainly leave this part up to wxMediaCtrl -
170 but if you need a certain backend for a particular reason, such as QuickTime
171 for playing .mov files, all you need to do to choose a specific backend is
172 to pass the name of the backend class to wxMediaCtrl::Create().
173
174 The following are valid backend identifiers:
175
176 - @b wxMEDIABACKEND_DIRECTSHOW: Use ActiveMovie/DirectShow.
177 Uses the native ActiveMovie (I.E. DirectShow) control.
178 Default backend on Windows and supported by nearly all Windows versions,
179 even some Windows CE versions.
180 May display a windows media player logo while inactive.
181 - @b wxMEDIABACKEND_QUICKTIME: Use QuickTime. Mac Only.
182 WARNING: May not working correctly embedded in a wxNotebook.
183 - @b wxMEDIABACKEND_GSTREAMER, Use GStreamer. Unix Only.
184 Requires GStreamer 0.8 along with at the very least the xvimagesink, xoverlay,
185 and gst-play modules of gstreamer to function.
186 You need the correct modules to play the relevant files, for example the
187 mad module to play mp3s, etc.
188 - @b wxMEDIABACKEND_WMP10, Uses Windows Media Player 10 (Windows only) -
189 works on mobile machines with Windows Media Player 10 and desktop machines
190 with either Windows Media Player 9 or 10.
191
192 Note that other backends such as wxMEDIABACKEND_MCI can now be found at
193 wxCode (http://wxcode.sourceforge.net/).
194
195
196 @section mediactrl_creating_backend Creating a backend
197
198 Creating a backend for wxMediaCtrl is a rather simple process.
199 Simply derive from wxMediaBackendCommonBase and implement the methods you want.
200 The methods in wxMediaBackend correspond to those in wxMediaCtrl except for
201 wxMediaCtrl::CreateControl which does the actual creation of the control,
202 in cases where a custom control is not needed you may simply call wxControl::Create().
203
204 You need to make sure to use the @c DECLARE_CLASS and @c IMPLEMENT_CLASS macros.
205
206 The only real tricky part is that you need to make sure the file in compiled in,
207 which if there are just backends in there will not happen and you may need to
208 use a force link hack (see http://www.wxwidgets.org/wiki/index.php/RTTI).
209
210 This is a rather simple example of how to create a backend in the
211 wxActiveXContainer documentation.
212
213
214 @library{wxmedia}
215 @category{media}
216
217 @see wxMediaEvent
218 */
219 class wxMediaCtrl : public wxControl
220 {
221 public:
222 /**
223 Default constructor - you MUST call Create() before calling any
224 other methods of wxMediaCtrl.
225 */
226 wxMediaCtrl();
227
228 /**
229 Constructor that calls Create().
230 You may prefer to call Create() directly to check to see if
231 wxMediaCtrl is available on the system.
232
233 @param parent
234 parent of this control. Must not be @NULL.
235 @param id
236 id to use for events
237 @param fileName
238 If not empty, the path of a file to open.
239 @param pos
240 Position to put control at.
241 @param size
242 Size to put the control at and to stretch movie to.
243 @param style
244 Optional styles.
245 @param szBackend
246 Name of backend you want to use, leave blank to make wxMediaCtrl figure it out.
247 @param validator
248 validator to use.
249 @param name
250 Window name.
251 */
252 wxMediaCtrl(wxWindow* parent, wxWindowID id, const wxString& fileName = wxEmptyString,
253 const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
254 long style = 0, const wxString& szBackend = wxEmptyString,
255 const wxValidator& validator = wxDefaultValidator,
256 const wxString& name = "mediaCtrl");
257
258 /**
259 Creates this control.
260 Returns @false if it can't load the movie located at @a fileName
261 or it cannot load one of its native backends.
262
263 If you specify a file to open via @a fileName and you don't specify a
264 backend to use, wxMediaCtrl tries each of its backends until one that
265 can render the path referred to by @a fileName can be found.
266
267 @param parent
268 parent of this control. Must not be @NULL.
269 @param id
270 id to use for events
271 @param fileName
272 If not empty, the path of a file to open.
273 @param pos
274 Position to put control at.
275 @param size
276 Size to put the control at and to stretch movie to.
277 @param style
278 Optional styles.
279 @param szBackend
280 Name of backend you want to use, leave blank to make wxMediaCtrl figure it out.
281 @param validator
282 validator to use.
283 @param name
284 Window name.
285 */
286 bool Create(wxWindow* parent, wxWindowID id, const wxString& fileName = wxEmptyString,
287 const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
288 long style = 0, const wxString& szBackend = wxEmptyString,
289 const wxValidator& validator = wxDefaultValidator,
290 const wxString& name = "mediaCtrl");
291
292 /**
293 Obtains the best size relative to the original/natural size of the
294 video, if there is any.
295 See @ref mediactrl_video_size for more information.
296 */
297 wxSize GetBestSize() const;
298
299 /**
300 Obtains the playback rate, or speed of the media. @c 1.0 represents normal
301 speed, while @c 2.0 represents twice the normal speed of the media, for
302 example. Not supported on the GStreamer (Unix) backend.
303
304 @return zero on failure.
305 */
306 double GetPlaybackRate();
307
308 /**
309 Obtains the state the playback of the media is in -
310
311 @beginTable
312 @row2col{wxMEDIASTATE_STOPPED, The movie has stopped.}
313 @row2col{wxMEDIASTATE_PAUSED, The movie is paused.}
314 @row2col{wxMEDIASTATE_PLAYING, The movie is currently playing.}
315 @endTable
316 */
317 wxMediaState GetState();
318
319 /**
320 Gets the volume of the media from a 0.0 to 1.0 range.
321
322 @note Due to rounding and other errors the value returned may not be the
323 exact value sent to SetVolume().
324 */
325 double GetVolume();
326
327 /**
328 Obtains the length - the total amount of time the movie has in milliseconds.
329 */
330 wxFileOffset Length();
331
332 /**
333 Loads the file that fileName refers to. Returns @false if loading fails.
334 */
335 bool Load(const wxString& fileName);
336
337 /**
338 Loads the location that uri refers to. Note that this is very
339 implementation-dependent, although HTTP URI/URLs are generally
340 supported, for example. Returns @false if loading fails.
341 */
342 bool Load(const wxURI& uri);
343
344 /**
345 Loads the location that @c uri refers to with the proxy @c proxy.
346 Not implemented on most backends so it should be called with caution.
347 Returns @false if loading fails.
348 */
349 bool Load(const wxURI& uri, const wxURI& proxy);
350
351 /**
352 Same as Load(const wxURI& uri). Kept for wxPython compatibility.
353 */
354 bool LoadURI(const wxString& fileName);
355
356 /**
357 Same as Load(const wxURI& uri, const wxURI& proxy).
358 Kept for wxPython compatibility.
359 */
360 bool LoadURIWithProxy(const wxString& fileName, const wxString& proxy);
361
362 /**
363 Pauses playback of the movie.
364 */
365 bool Pause();
366
367 /**
368 Resumes playback of the movie.
369 */
370 bool Play();
371
372 /**
373 Seeks to a position within the movie.
374
375 @todo Document the wxSeekMode parameter @a mode, and perhaps also the
376 wxFileOffset and wxSeekMode themselves.
377 */
378 wxFileOffset Seek(wxFileOffset where, wxSeekMode mode = wxFromStart);
379
380 /**
381 Sets the playback rate, or speed of the media, to that referred by @a dRate.
382 @c 1.0 represents normal speed, while @c 2.0 represents twice the normal
383 speed of the media, for example. Not supported on the GStreamer (Unix) backend.
384 Returns @true if successful.
385 */
386 bool SetPlaybackRate(double dRate);
387
388 /**
389 Sets the volume of the media from a 0.0 to 1.0 range to that referred
390 by @c dVolume. @c 1.0 represents full volume, while @c 0.5
391 represents half (50 percent) volume, for example.
392
393 @note The volume may not be exact due to conversion and rounding errors,
394 although setting the volume to full or none is always exact.
395 Returns @true if successful.
396 */
397 bool SetVolume(double dVolume);
398
399 /**
400 A special feature to wxMediaCtrl. Applications using native toolkits such as
401 QuickTime usually have a scrollbar, play button, and more provided to
402 them by the toolkit. By default wxMediaCtrl does not do this. However, on
403 the directshow and quicktime backends you can show or hide the native controls
404 provided by the underlying toolkit at will using ShowPlayerControls(). Simply
405 calling the function with default parameters tells wxMediaCtrl to use the
406 default controls provided by the toolkit. The function takes a
407 wxMediaCtrlPlayerControls enumeration, please see available show modes there.
408
409 For more info see @ref mediactrl_player_controls.
410
411 Currently only implemented on the QuickTime and DirectShow backends.
412 The function returns @true on success.
413 */
414 bool ShowPlayerControls(wxMediaCtrlPlayerControls flags = wxMEDIACTRLPLAYERCONTROLS_DEFAULT);
415
416 /**
417 Stops the media.
418
419 See @ref mediactrl_operation for an overview of how stopping works.
420 */
421 bool Stop();
422
423 /**
424 Obtains the current position in time within the movie in milliseconds.
425 */
426 wxFileOffset Tell();
427 };
428