| Microsoft DirectX 9.0 |
Note This introductory material applies only to C++ developers.
Microsoft® DirectShow® supports system-defined events, which filters in the filter graph pass to the filter graph manager. Filters pass these events to the filter graph manager by using the IMediaEventSink::Notify method, and the application retrieves them with the IMediaEvent::GetEvent method.
When you retrieve an event by calling GetEvent, the event can contain interface pointers or pointers to allocated memory. Code that uses GetEvent should, therefore, call IMediaEvent::FreeEventParams to free any resources associated with the event's parameters after it handles the event.
The DVD event notification codes are listed in Dvdevcod.h. See Event Notification Codes for non-DVD event notification codes. The following list shows the available DVD event notification codes in alphabetical order.
| DVD event notification code | Description |
| EC_DVD_ANGLE_CHANGE | Signals that either the number of available angles changed or that the current angle number changed. |
| EC_DVD_ANGLES_AVAILABLE | Indicates whether an angle block is being played and angle changes can be performed. |
| EC_DVD_AUDIO_STREAM_CHANGE | Signals that the current audio stream number changed for the main title. |
| EC_DVD_BUTTON_AUTO_ACTIVATED | Signals that a menu button has been automatically activated per instructions on the disc. |
| EC_DVD_BUTTON_CHANGE | Signals that either the number of available buttons changed or that the currently selected button number changed. |
| EC_DVD_CHAPTER_AUTOSTOP | Indicates that playback stopped as the result of a call to the IDvdControl2::PlayChaptersAutoStop method. |
| EC_DVD_CHAPTER_START | Signals that the DVD Navigator started playback of a new chapter in the current title. |
| EC_DVD_CMD_START | Signals that a particular command has begun. |
| EC_DVD_CMD_END | Signals that a particular command has completed. |
| EC_DVD_CURRENT_HMSF_TIME | Signals the current time in DVD_HMSF_TIMECODE format at the beginning of every VOBU, which occurs every .4 to 1.0 sec. |
| EC_DVD_CURRENT_TIME | Signals the beginning of every video object unit (VOBU), a video segment which is 0.4 to 1.0 seconds in length. |
| EC_DVD_DISC_EJECTED | Signals that a disc has been ejected from the drive. |
| EC_DVD_DISC_INSERTED | Signals that a disc has been inserted into the drive. |
| EC_DVD_DOMAIN_CHANGE | Indicates the DVD Navigator's new domain. |
| EC_DVD_ERROR | Signals a DVD error condition. |
| EC_DVD_KARAOKE_MODE | Indicates that the Navigator has either begun playing or finished playing karaoke data. |
| EC_DVD_NO_FP_PGC | Indicates that the DVD disc does not have a FP_PGC (First Play Program Chain). |
| EC_DVD_PARENTAL_LEVEL_CHANGE | Signals that the parental level of the authored content is about to change. |
| EC_DVD_PLAYBACK_RATE_CHANGE | Indicates that a playback rate change has been initiated and the new rate is in the parameter. |
| EC_DVD_PLAYBACK_STOPPED | Indicates that playback has been stopped. The DVD Navigator has completed playback of the title and did not find any other branching instruction for subsequent playback. |
| EC_DVD_PLAYPERIOD_AUTOSTOP | Indicates that the Navigator has finished playing the segment specified in a call to PlayPeriodInTitleAutoStop. |
| EC_DVD_STILL_OFF | Signals the end of any still. |
| EC_DVD_STILL_ON | Signals the beginning of any still. |
| EC_DVD_SUBPICTURE_STREAM_CHANGE | Signals that the current subpicture stream number changed for the main title. |
| EC_DVD_TITLE_CHANGE | Indicates when the current title number changes. |
| EC_DVD_VALID_UOPS_CHANGE | Signals that the available set of IDvdControl2 interface methods has changed. |
| EC_DVD_WARNING | Signals a DVD warning condition. |