hi Timm;
I think this case requires an API addition to GStreamer, instead of trying
to work around it in Perl. GstBuffer should get a get_flags() method to
replace the macro - as macros have always been fairly unfriendly to
language bindings.
you should file a bug against GStreamer.
ciao,
Emmanuele.
On Wednesday, December 24, 2014, Timm Murray <tmur...@wumpus-cave.net>
wrote:
> After a little more investigation into the C code, GST_BUFFER_FLAG_IS_SET
> calls into GstMiniObject to check the flags. There is a mini_object()
> method on GstBuffer, so I gave this a try:
>
> if(! ($data_buf->mini_object->flags & 'flag_delta_unit') ) {
> $is_key_frame = 1;
> }
>
> That leaves me with the error "Could not get field 'dispose' at . . . "
> with the line number pointing to the 'if' statement above.
>
> The original GStreamer module has a little xs code to help with the flags
> on GstBuffer. That might be the way to go for GStreamer1, too, but I'd
> like to see if we can do this in Perl first.
>
> Thanks,
> Timm
>
> On Tue, Dec 23, 2014 at 8:55 AM, Timm Murray <tmur...@wumpus-cave.net
> <javascript:_e(%7B%7D,'cvml','tmur...@wumpus-cave.net');>> wrote:
>
>> I have an application that sends a video stream to a client over a custom
>> protocol. When the client first connects, we need to wait until the next
>> keyframe so the client can decode it sensibly. Alternatively, the client
>> could read a flag in the protocol and wait for a keyframe on its end.
>> Either way, we need to check the GstBuffer flags for a keyframe.
>>
>> The C code to do this would be:
>>
>> if(!GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT)) {
>> // it's a keyframe
>> }
>>
>> GstBufferFlags is itself an enum. The issue is that
>> GST_BUFFER_FLAG_IS_SET() is itself a C macro rather than a straight
>> function. So is GST_BUFFER_FLAGS(). There doesn't seem to be any other
>> mechanisim in GstBuffer for checking the flags. I'm not sure how the
>> introspection bindings would have picked up the macros.
>>
>> Thanks,
>> Timm
>>
>
>
--
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[@] ebassi [@gmail.com]
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