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Author Topic: Closed caption interface : Line21_BytePair subtype  (Read 3564 times)
ivansim
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« on: April 02, 2009, 12:02:26 am »

I use filter “MainConcept MPEG-2 Video Decoder (Becard Ltd www.elecard.com)” to play a MPG-2 file (1920x1080 pixels). It has 2 out pins (“Video” and “~CC”).
My input pin is connected to  the ~CC Out pin  with the interface :
 - MajorType:  AUXLine21Data,   SubType:  Line21_BytePair.

I understood that a new frame begins with a new value (TimeStart) which I get in Transform-method by calling  Sample.GetTime(TimeStart,TimeEnd). The size of every sample is 2 bytes.

Could you explain to me how to interpret the sequence of pairs (till next changing of TimeStart), because Closed Caption Construct may be 4 types – and what to put in the field cc_type of those “CC constructs” (possible values are 0,1,2,3 as said in  "SMPTE 334-2-2007") ?

Thanks!
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posdnya
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« Reply #1 on: April 17, 2009, 08:44:06 am »

The most simple way is to use MS Line21 Decoder
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