Stream Buffer Engine Event Codes
| Microsoft DirectShow 9.0 |
Stream Buffer Engine Event Codes
This topic applies only to Windows XP Service Pack 1 or later.
The Stream Buffer Engine posts the following events to the Filter Graph Manager.
| Event notification code | Description |
| STREAMBUFFER_EC_CONTENT_BECOMING_STALE | The Stream Buffer Source has lagged behind the Stream Buffer Sink by more than a pre-set number of backing files. For more information, see IStreamBufferConfigure::GetBackingFileCount. |
| STREAMBUFFER_EC_PRIMARY_AUDIO | The Stream Buffer Engine is processing primarily audio data. This event is sent if video samples are captured at a very low frame rate. This event most often occurs with audio services on a DVB stream, but it might also indicate a problem with capturing or encoding the video. (Applies to Update Rollup 2 for Microsoft Windows XP Media Center Edition 2005 or later.) |
| STREAMBUFFER_EC_RATE_CHANGED | The playback rate has changed.
param1 = old playback rate x 1000 param2 = new playback rate x 1000 For example, 2x speed is represented as 2000. |
| STREAMBUFFER_EC_READ_FAILURE | A read failure has occurred.
param1 = HRESULT code of the failure param2 = not used |
| STREAMBUFFER_EC_STALE_DATA_READ | The Stream Buffer Source is reading a backing file that has been marked for deletion. |
| STREAMBUFFER_EC_STALE_FILE_DELETED | A backing file has been deleted. |
| STREAMBUFFER_EC_TIMEHOLE | The Stream Buffer Source filter has reached a gap in the content.
param1 = Time of the start of the gap, in milliseconds, relative to the content start. param2 = Duration of the gap, in milliseconds. |
| STREAMBUFFER_EC_WRITE_FAILURE | A write failure has occurred. |
See Also