Sensoray 614 Windows - Manual (Page 32)

int board
);
This function is used to get compressed video data and/or audio data
out of the directshow graph. The function builds a DirectShow Capture
graph with the MPEG Capture pin connected to the DirectShow
SampleGrabber. The Sample Grabber runs in Callback mode. The callback
function must not block. The recording mode, recmode, determines how
the DirectShow graph is built. The function should be used if no
preview is required and the user just wants to get compressed frames
or compressed frames with audio from the 314.
There are three modes supported currently. “recmode=0” is a filter
graph with the 314 compressed capture pin connected to the
SampleGrabber. The SampleGrabber filter is then connected to a Null
Renderer as required by the DirectShow SDK. The callback function is
called when compressed frames are received. The callback function MUST
be registered with SN_RegisterVidCB before calling this function.
Otherwise, the graph gets built and no frames are delivered.
“recmode=1” puts a SampleGrabber at the output of the multiplexer of
the compressed video and encoded audio data. The console demo
demonstrates the use of this mode. Currently only encode types of
MPEG1 and MPEG2 are supported with this mode. The AVI Mux used for
MP4S MPEG4 or Motion JPEG does not support streaming so data can’t be
saved using callbacks. MPEG4 data and MotionJpeg data is available,
but modes 0, 3 or 4 should be used for them.
“recmode=2” is the same as “recmode=1” but no audio is added to the
multiplexer.
“recmode=3” and “recmode=4” are the same as “recmode=0”, but have an
additional audio stream. “recmode=3” has encoded audio and “recmode=4”
has raw audio. The audio callback MUST be registered with
SN_RegisterAudCB before calling this function to get the audio data.
This is shown in the console demo.
There is no preview supported in this callback filter graph.
Therefor, any preview related functions do not
apply(SN_SetBoardWindow, SN_SetRenderVideo, etc..)
Parameters
recmode
Recording mode(see above)
board
board number in system.
Returns
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