Well, it's fetched through the macro GST_BUFFER_FLAGS. There seems to be
different implementations for GStreamer 1.0 and 0.10. The 1.0 version
passes it along to GST_MINI_OBJECT_FLAGS. 0.10 has its own flags field.
Either way, probably want to call the macro rather than drilling down the
internals.
On Mon, Jan 5, 2015 at 10:40 AM, Torsten Schoenfeld <kaffeeti...@gmx.de>
wrote:
> On 24.12.2014 02:31, Timm Murray 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.
>
> I don't even get to the "dispose" field; I get a segfault
> early on when trying to access the "copy" field in the "mini_object"
> field. Since GstMiniObject doesn't seem to have a GType anymore,
> Glib::Object::Introspection's generic struct converter kicks in, and
> chokes on the non-introspectable function pointer field "copy" which it
> mistakes for holding a Perl variable.
>
> (The struct conversion code assumes that void pointer fields are used to
> hold user data, so they read and write raw Perl values into them. This
> hack is to support implementing GtkTreeModel. Unfortunately, in the
> introspection data, the non-introspectable field "copy" seems to be
> indistinguishable from a void pointer field.)
>
> I don't currently see a quick way to fix this.
>
> I agree with Emmanuele that a dedicated flags API would be best.
>
> On 30.12.2014 16:16, Timm Murray wrote:
> > What I'd like to do is support this interface:
> >
> > if( $data_buf->flag_is_set( 'flag-delta-unit' ) ) { ... }
> >
> > For that to work, there needs to be a way to convert that string back
> > into the GstBufferFlag enum value from whence it came. Is there an
> > easy way to do that?
>
> That's not currently possible from pure Perl, but could be supported.
> (Along the lines of Glib::Object::Introspection->convert_sv_to_enum and
> convert_enum_to_sv.)
>
> But how do you actually retrieve the flags of a buffer?
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