[Live-devel] Question about DeviceSource implementation....

[Ross Finlayson]

>I try to stream MPEG2 PS over the network polling from
>a 656/I2S Capture card (this card will capture the dvd player signal and
>encode it in MPEG2 format) directly.
>
>Now i am making a DeviceSource implementation by modifying
>ByteStreamFileSource and change the fread from doGetNextFrame() to
>Mydevice->Read that implements the read from capture card

Is your capture card accessible (i.e., readable) as a file?  If so, you 
could probably use "ByteStreamFileSource" as is.

(This, BTW, is one of the many reasons why Unix is far superior to Windows 
for running systems software.  In Unix, devices (such as capture cards) are 
part of the file system, and can be read as if they were files.  Other 
people running Unix have streamed from a video capture card using the 
existing "testMPEG1or2AudioVideoStreamer" application, but just changing 
the input file name "test.mpg" to "stdin".)

>  and than hook
>mydevice implementation into filesink to record my input data into a file
>but i meet some problems. First, the record file seems too bigger and always
>play the same frames (1~3) recursively. it seems that that the donextframe
>always send the same data...

As far as I can tell, it's your own *receive* function that's reading the 
same data over and over again.  I.e., the problem doesn't appear to have 
anything to do with the LIVE.COM code.  You can verify this by writing the 
data into a file, immediately after the call to "fManager->receive".

RYHCSC ("Remember, You Have Complete Source Code").