CaptureByInput

Supported Hardware Devices: Pro Capture cards

Contents Demonstrated in the Sample:

1. Capturing video data according to the format of input signals
2. Saving the last frame of video data as a BMP image
3. Channel selection via command parameters when multiple devices are available

Call Logic:

1. Obtain version information, initialize, and enumerate devices: MWGetVersion, MWCaptureInitInstance, MWRefreshDevice, MWGetChannelCount
2. Filter supported devices based on device and interface information: MWGetChannelInfoByIndex
3. Open the device:
   1. Open the device specified by command parameters: MWOpenChannel
   2. When no device is specified in command parameters, open the first available channel by default: MWGetDevicePath, MWOpenChannelByPath
4. Retrieve video signal status: MWGetVideoSignalStatus
5. Start video capture: MWStartVideoCapture
6. Create event: MWCreateEvent
7. Register for message notifications: MWRegisterNotify MWCAP_NOTIFY_VIDEO_FRAME_BUFFERED (normal mode), MWCAP_NOTIFY_VIDEO_FRAME_BUFFERING (low-latency mode)
8. Wait for event: MWTryWaitEvent, MWWaitEvent
9. Capture video data: MWCaptureVideoFrameToVirtualAddressEx MWCAP_VIDEO_FRAME_ID_NEWEST_BUFFERED (normal mode), MWCAP_VIDEO_FRAME_ID_NEWEST_BUFFERING (low-latency mode)
10. Retrieve current capture status: MWGetVideoCaptureStatus
11. Repeat steps 8, 9, and 10 until the last frame
12. Save file
13. Deregister message notifications: MWUnregisterNotify
14. Close event: MWCloseEvent
15. Stop capture: MWStopVideoCapture
16. Release resources: MWCloseChannel, MWCaptureExitInstance

Result:

Flowchart: