Sensoray 2255 Bedienungsanleitung PDF herunterladen (Seite 15)

channel number (1-4).

pStatus

a pointer to the current video status value. Bit [0]: a value of 1 indicates video signal

present. Bit [8]: 0 for 60Hz signal (usually NTSC,) 1 for 50Hz signal (usually PAL). If Bit [0]

is 0, then the value of bit [8] should be ignored.

Examples:

*pStatus = 0x0100 - no video signal present;

*pStatus = 0x0001 - 60Hz video signal present;

*pStatus = 0x0101 - 50Hz video signal present.

Returns

0 on success.

S2255_QueryBuf(HDEVICE hdev, int channel, int frmnum);

Queries the status of a given buffer.

Parameters

hdev

a handle to the 2255 device.

channel

channel number (1-4).

frmnum

Index of frame in question (starting from 0). Must be smaller than number of registered

buffers.

Returns

Returns 0 if a frame buffer is unused. Returns 1 if a buffer is currently being filled (do not use

buffer). Returns 2 if a buffer is ready (dequeue buffer after use). Returns -1 or negative value

if failure occurs.

S2255_QueryBufExt(HDEVICE hdev, int channel, int frmnum, unsigned int

*ts);

Queries the status of a given buffer and returns timestamp (in milliseconds) of frame.

Parameters

hdev

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Sensoray 2255 Bedienungsanleitung Seite 15