New parser for parsing a custom format

[Bharath Bhushan (Kowshik)]

Thanks Nicolas.

- Is there a specific depayloader I can start from? How about gdpdepay.c? Among the myriad rtp depayloaders, anything that I can start from?
- Is it enough to make my plugin a simple Element (like gdpdepay.c) or is it better to build on GstBaseParse or GstRawBaseParse?

> On 03-Feb-2021, at 9:08 PM, Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> 
> Le mercredi 03 février 2021 à 12:57 +0530, Bharath Bhushan (Kowshik) a écrit :
>> Hello Gstreamers,
>> 
>> I am planning to write a new gstreamer parser plugin for parsing a custom
>> byte-stream format. The pipeline should look something like below:-
>> Example A: tcpclientsrc ! my-custom-parser ! h264parse ! fakesink 
>> Example B: filesrc ! my-custom-parser ! h264parse ! fakesink
>> 
>> The byte-stream has the following format:
>>         4 bytes: size of data segment and timestamp
>>         8 bytes: timestamp
>>         N-8 bytes: data segment which is a H.264 NALU
>> 
>> My plugin will create one GstBuffer per data segment and set the PTS/DTS based
>> on the timestamp and send it to the downstream plugin (h264parse for example).
>> 
>> Some questions:-
>> - Is there a simple parser example plugin which I can start from?
> 
> This is more like a depayloader, but indeed we sometimes call parser or demuxer.
> Your format seems similar to IVF used to cary parsable VP8 and VP9 data.
> 
>> - Is vorbisparse a good example to use? Is gstttransform.c in the gst-
>> templates repo a good example to use?
>> - What are the options for push vs pull that are available in my parser? 
>> - Is there any documentation about how to write new parsers?
>> 
>> Any help is greatly appreciated.
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> 
> 
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