[Live-devel] RTSP Client subclassing questions.

[Cristiano Belloni]

belloni at imavis.com wrote:
>>>  > I'm saying that you might not need to write any new (sub)classes at
>>>       
>>>>  all.  Can you tell me some more about what your data looks like -
>>>>  i.e., what video codec are you using, and how is the data different
>>>>  from the standard?
>>>>
>>>>         
>>> It's MPEG-4 data, 1440 bytes a packet.
>>>       
>> MPEG-4 frames are variable-length, and so cannot always be 1440 bytes
>> in length.
>>     
>
> Maybe there is a misunderstanding.
> The server will send RTP packets, payload size of 1440 bytes if they are
> starting or middle frame packet. If they are ending frame packets, packet
> length will  be variable:
>
> [...]
> ---frame n starts
> RTP packet - 1440 bytes payload
> RTP packet - 1440 bytes payload
> RTP packet - ? (< 1440) bytes payload
> ---frame n ends
> ---frame n+1 starts
> RTP packet - 1440 bytes payload
> RTP packet - 1440 bytes payload
> RTP packet - 1440 bytes payload
> RTP packet - 1440 bytes payload
> RTP packet - ? (< 1440) bytes payload
> ---frame n+1 ends
> [...]
>
> What I'm asking is:
>
> 1) Is there a way to set up a function that's called every time an RTP
> packet is received?
>
> 2) If there is, will the packtes be in order (i.e. function for packet n
> is called _after_ function for packet n-1 and _before_ packet n+1)?
>
> Alternatively, packets will normally have the mark flag set to "true" to
> mark the boundaries  between a frame and the next.
>
> 3) Is there a way to set up a function that's called every time an RTP
> frame  is received?
>
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>
>   
Ok, let's say the cam sends me a pure MPEG4 stream, with no custom headers:

1) Is there a way to set up a function that's called every time an RTP
packet is received?

2) If there is, will the packtes be in order (i.e. function for packet n
is called _after_ function for packet n-1 and _before_ packet n+1)?

3) Is there a way to set up a function that's called every time an RTP
frame  is received?

Thanks, Cristiano.

-- 
Belloni Cristiano
Imavis Srl.
www.imavis.com <http://www.imavis.com>
belloni at imavis.com <mailto://belloni@imavis.com>